Indonesia Conference Directory

Corresponding Author
Andang Sunarto

Institutions
1.IAIN Bengkulu, Indonesia.
2.Faculty of Science and Natural Resources,
Universiti Malaysia Sabah, Malaysia.

Abstract
In this study, we examines the effectiveness of the Preconditioned Accelerated Over-Relaxation (PAOR) iterative method together with an unconditionally implicit finite difference approximation equation to solve space-fractional diffusion equations (SFDE-s) by using the Caputo-s space-fractional derivative. For this, the implicit approximation equation and preconditioned matrix are used to construct the corresponding preconditioned linear system in which its coefficient matrix is large scale and sparse. Then, formulation and implementation the PAOR iterative method are also presented. Based on numerical algorithm results of the proposed iterative method, it can be concluded that the proposed iterative method (PAOR) is superior to the PSOR and PGS iterative methods.

Keywords
PAOR, Space-fractional diffusion equations, Implicit finite difference, Caputo-s

Topic
Mathematics

Link: https://ifory.id/abstract/fzh89ctnkVqW

Corresponding Author
Hertien Koosbandiah Surtikanti

Institutions
Departemen Pendidikan Biologi
Program Studi Biologi, FPMIPA UPI

Abstract
Water catchment area of Cilaja is located in along Giri Mekar and Sindanglaya village, Ujung Berung, Bandung. This river has high values for the people living surrounding that area. It supports clean water supply, coffee plantation, agriculture area and fish farming area. Field study is done to monitor water quality due to high variation of human activities. Three location sites (coffee/pinus plantation, agriculture and residential area) were selected. Bioindicator benthos were collected from these site locations. Chemical-physical water were measured and analysed. This biomonitoring study is done between year 2013-2017. The results show that based on the distribution and composition of bioindicator benthos, the three differrent land uses has good water quality within 5 years. People attitudes in environmental aware play an important role in conserving water quality for long period of time.

Keywords
water quality, bioindicator benthos, human activities, chemical water

Topic
Biology

Link: https://ifory.id/abstract/uwevGEF3tUkh

Corresponding Author
Idawarni Asmal

Institutions
Hasanuddin University

Abstract
Women who have a main job as housewives will have a lot of time in their family and settlements and do everything related to domestic work. On the other hand, as social beings, women have a desire to interact with each other. In addition, as a fishermans wife who is often left by her husband to go to sea for a certain period of time, then as a wife, she must still be able to maintain the continuity of the relationship with the residents in the settlement. If one of these activities is prioritized or ignored, then life will not run harmoniously. Therefore, the purpose of the research is to find out how women can harmonize their desires to act as housewives and as social beings. The method used is behavioral mapping that uses 2 forms, namely the Person Center Mapping and Place Center Mapping. The population is housewives, while the sample is women who are doing domestic activities and social activities in the village at the Ujung Kassi. Using descriptive analysis. The results of the study found that womens activity space was influenced by the main types of activities. The main activity is permanent and requires a long duration of time, carried out in a protected and comfortable space. Other temporary activities are only occasionally carried out for certain events with an indefinite duration of time. Whereas incidental activities are of short duration and generally occur in public spaces. Time for activities is strongly influenced by the type of activities and place of activity.

Keywords
Harmonization; domestic work; social relations; women fishermen

Topic
Occupational and women

Link: https://ifory.id/abstract/mdQ6MLcjtkDN

Corresponding Author
Yessi Jusman

Institutions
(1) Universitas Muhammadiyah Yogyakarta, Indonesia
(2) Universiti Sains Malaysia, Malaysia

Abstract
Abstract This study aims to quantify the corrosion of steel reinforcing bar (rebar) in concrete structures using ground penetrating radar (GPR) and image processing techniques. A method to accelerate corrosion of steel rebars in concrete slab to different level of corrosion is applied. The power supply and the electrolyte are used to induce significant corrosion within a short period of time. The 2 GHz GPR is used to assess the corrosion in the reinforced concrete slab after 28 days of standard moist preservation. GPR method has been found to be useful for quantifying steel corrosion on existing concrete slab. The image processing techniques were used to process the GPR data. The results of the analysis of the GPR data shows that corrosion of the rebars could be detected. The subsequent image processing technique exhibits that corrosion of the rebars could be appropriate quantified.

Keywords
Corrosion, concrete, GPR, image processing

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/N2AwePXbznjW

Corresponding Author
Lis Noer Aini

Institutions
Universitas Muhammadiyah Yogyakarta, Indonesia

Abstract
The research aimed to find out the best concentration from various vanilla essential oil concentration as antimicrobial agent added to alginat edible coating to inhibit the growth of microbial decomposition and maintain shelf-life of fresh-cut red Pitaya (Hylocereus polyrhizus). The experiment was designed with Completely Randomized Design using four treatments as follows: 1) vanilla essential oil 0%, 2) vanilla essential oil 0.1%, 3) vanilla essential oil 0.3% and 4) vanilla essential oil 0.6%. The result showed that vanilla essential oil 0,6% was able to inhibit fresh-cut red Pitaya-s fungal decomposition. Concentration of vanilla essential oil 0,6% could maintain physical and chemical quality based on weight loss, firmness, titratable acidity and total soluble solids content. Moreover, sensory analysis on fresh-cut red Pitaya indicated that the same result. Edible coating alginate and vanilla essential oil was able to maintain the quality of fresh-cut red Pitaya up to 9 days.

Keywords
Fresh-cut Red Pitaya, Vanilla Essential Oil, Edible coating, Alginate

Topic
International Conference on Sustainable Agriculture

Link: https://ifory.id/abstract/Y8D74fLCpTNm

Corresponding Author
Siti Nur Aisyah

Institutions
Department of Agrotechnology, Faculty of Agriculture, Universitas Muhammadiyah Yogyakarta, Bantul 55183, Special Region of Yogyakarta

Abstract
Long term application of anorganic fertilizers had damaged the soil physically and chemically, thus reducing the soil support capacity toward the plants growth. It also suppressed the population of beneficial microbes in the soil. The use of organic fertilizers made from cow blood and bones in combination with coconut fiber ash might improve the plant productivity without causing severe damage towards the soil. Aim of this study was to analyze the macronutrients (nitrogen, potassium and phosphorus) content resulted from various combination ratios of cow blood, cow bones and coconut fiber ash. This study consisted of two main steps, including the making of organic fertilizer and analysis of macronutrients content. Organic fertilizer was composed using five different ratios in the combination of cow blood (4.0-6.0 g), cow bone (1.75-2.75 g) and coconut fiber ash (4.0-6.0 g). Results showed that each combination (cow blood, bone and coconut fiber ash) produced various level of macronutrients content. The highest nitrogen content (1.74%) was achieved from the combination of 5.5 g blood, 2.5 g bone and 5.5 g coconut fiber ash. The highest content of available phosphorus (P) (41.469 ppm) was produced by the combination of 5.0 g blood, 2.25 g bone and 5.0 g coconut fiber ash. The highest content of available potassium (154.25 Cmol/kg) was obtained from the combination of 4.0 g blood, 1.75 g bone and 4.0 g coconut fiber ash.

Keywords
nitrogen, phosphorus, potassium, soil, animal waste

Topic
International Conference on Sustainable Agriculture

Link: https://ifory.id/abstract/rutCHFbncvaX

Corresponding Author
Andi Idhil Ismail

Institutions
a) Mechanical Engineering, Institut Teknologi Kalimantan
Jl. Soekarno Hatta KM 15, Balikpapan, Kalimantan Timur, 76127
*a.idhil[at]itk.ac.id
b) National Center for Sustainable Transportation Technology (NCSTT), Bandung
c) Material and Metallurgy, Institut Teknologi Kalimantan, Jl. Soekarno Hatta KM 15, Balikpapan, Kalimantan Timur, 76127
*gusti.unt[at]itk.ac.id

Abstract
Machining of titanium alloys remains a challenging task due to its low thermal conductivity and other inheritance properties. This phenomenon often causes the reduction of tool life, increasing production cost and time. Several factors play role in determining the tool life such as cutting speed, feed, chip formation, and tool geometry. The current work investigates the effect of tool geometry and feed to the cutting temperature, force, and chip formation. Finite element method (FEM) is implemented to model orthogonal cutting process in the titanium alloy (Ti6Al4V). We use Johnson-Cook (J-C) material constitutive model and Johnson-Cook (J-C) fracture-damage model to simulate the process. Our results demonstrate that at the rake angle of 0° the cutting force and cutting temperature reach maximum value of 490 °C. The temperature decreases to around 370 °C if the cutting rake angle changes to 10°. Feed seems to have low impact in the temperature. The effect of feed and rake angle is more pronounced in the cutting force.

Keywords
Ti-6Al-4V; Machining; Finite Element Method

Topic
Lightweight Structure

Link: https://ifory.id/abstract/FDj34xYJCuhM

Corresponding Author
Siti Nur Arifah

Institutions
Universitas Negeri Malang

Abstract
Single Garlic Oil (SGO) extract contains organosulfur compounds such as S-allyl-L-cysteine sulfoxides (alliin), allicin, Z-ajoene, and E-ajoene. This study aimed to observe organosulfur compounds in SGO extract as medicinal plant to decrease inflammatory signaling caused by high fat diet (HFD) consumption. Twenty-four adult males of Balb C mice were divided into six groups: normal diet, HFD treated with statin 26 mg/kgBW, HFD without treatment, HFD treated with SGO 12.5 mg/kgBW, HFD treated with SGO 25 mg/kgBW, and HFD treated with SGO 50 mg/kgBW. Indicators of inflammatory status in the study were liver weight, liver morphology, spleen weight, level of superoxide dismutase (SOD), level of tumor necrosis factor α (TNF-α) in serum, and expression of TNF-α in aorta. Liver weight and spleen weight in SGO treatment group showed a significant decrease compared to HFD without treatment group (P < 0.05). SGO also showed that it could reduce hepatic steatosis compared to HFD without treatment group on hepatic tissue of mice. The level of SOD was significantly increased in SGO treatment group compared to HFD without treatment group (P < 0.05). SGO has the ability to increase antioxidant activity of SOD resulted in the reduced of the level of inflammatory cytokine TNF-α in serum and expression of TNF-α in aorta, the reduced of the liver and spleen weight and the improvement of hepatic steatosis. These results indicated that SGO can be well considered as an alternative treatment to decrease inflammatory signaling caused by HFD.

Keywords
Single Garlic Oil (SGO), superoxide dismutase (SOD), tumor necrosis factor α (TNF-α)

Topic
Biomedical Science

Link: https://ifory.id/abstract/y38Ee9xbTRDc

Corresponding Author
Gatot Trimulyadi Rekso

Institutions
Center for Application of Isotopes and Radiation- National Nuclear Energy Agency, 49 Lebak Bulus Raya Street , South Jakarta, Indonesia
Corresponding author; e-mail; gatot2811[at]yahoo.com, Fax: +62-21-.7513270

Abstract
Abstract. Colloidal Silver Nanoparticles were synthesized by Gamma ray irradiation in aqueous lactic acid solution containing chitosan as stabilizer. The aim of this research is to know the effect of irradiation dose and concentration of chitosan in the formation of Nano-silver. Silver Nitrate of 2 mM is dissolve in the chitosan solution. The effect of chitosan concentration which varied 0,.3%, 0. 5%, and 0. 7%(b/v) were irradiated with gamma ray at dose of 5, 10 and 15 kGy. The formed of silver Nano were identified using UV –Vis spectrophotometer, particle size analyzer (PSA) and FTIR. The result shows, the concentration of chitosan (0.3 – 0,7%) in the irradiated solution also considerably affected the silver Nano particles size which decreased with increasing of irradiation dose. Due to the unique features of the processing procedures, thus Co-60 ray irradiation has been considered as a suitable method for synthesis of colloidal silver nanoparticles.

Keywords
Keywords : Nano particle, irradiation, nano silver, chitosan, lactic acid

Topic
Materials Science

Link: https://ifory.id/abstract/ReyAaPKwL8xX

Corresponding Author
Siska Erviani Depari

Institutions
UNIMED

Abstract
Inquiry models are commonly used to assess students problem solving and discovery abilities. However, there are several resistance to Inquiry syntax that can improve students science process skills. The purpose of this study was to determine the Inquiry model of students science process skills. This study is a quasi experimental research using samplings technique, where IVA class as experimental class I, IVB II as experimental class II, and IVC as control class. Data analysis techniques using covariate analysis (ANACOVA) using by SPSS 23.0 for windows applications and data collection using multiple choice test. Based on hypothesis test with P <0.05 then Ho is rejected and Ha accepted where this means there is significant influence on the application of model Inquiry with average value is 88.20. Its means that Guide Inquiry more positively than Modified Inquiry 77.20, and Direct instruction model (average value 70.60) to the students science process skill.

Keywords
Inquiry Learning, Direct Instruction, Science Process Skill

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/HtWjdFKZ29xG

Corresponding Author
Amini Amir Abdullah

Institutions
Department of Government and Civilization Studies
Faculty of Human Ecology,
Universiti Putra Malaysia

Abstract
The Islamic economic sector has grown rapidly in Malaysia and in the world including culinary, Islamic finance, Islamic takaful (insurance and mortgage) industries, fashion, cosmetics, pharmaceuticals, entertainment, and tourism. Islamic tourism is seen as a new way of developing the tourism industry in Malaysia as well as in line with ethics, culture and Islamic values. Islamic tourism is not defined as a visit to the mosque alone, but the visit is closely related to nature, culture, or creativity that integrates with Islamic values. Currently, the concept of adherence to Islam (which has been called as Shariah-compliant) has become a trend in the global economy, from food and beverage products, to lifestyle and finances. As a new lifestyle trend, many countries are beginning to introduce tourism products related to halal concept or Islamic orientation. Even countries like Korea, Japan, Australia, Thailand, New Zealand, and so on that are not Muslim-majority countries have helped in developing Islamic tourism prospects and products. The term Islamic tourism still has no clear boundaries and still uses various terms such as Halal Tourism, Halal Friendly Travel Destinations, Halal Travel, Islamic Travel Destinations, Halal Lifestyle and more. Even in Malaysia, the concept of Islamic tourism is also unclear. According to some Islamic tourism experts, tourism is a complementary product and does not eliminate the type of conventional tourism. As a new way of developing Islamic tourism in Malaysia itself, defending Islamic culture and values, efforts should be made to enhance Islamic tourism without eliminating the uniqueness and authenticity of Islamic culture and tradition. Islamic tourism is not only related to religious values but also must be in line with every way of life that is not contrary to Islam. The potential and prospects of Islamic tourism in Malaysia are still not maximized, whereas if we work more seriously, the potential of Islamic tourism in Malaysia is huge. Not many companies and agencies organize halal tourism packages because they think it is not a necessity and a profit while the actual fact is the opposite. Many companies are more focused on routine Islamic tourism such as Umrah and Hajj.

Keywords
ISLAMIC TOURISM, CHARACTERISTICS, CONCEPTS, PRINCIPLES

Topic
Halal Lifestyle, Fashion, Travel and Tourism

Link: https://ifory.id/abstract/bh3VyzWfYaDd

Corresponding Author
Mohd Daud Awang

Institutions
a)Assoc. Prof, Faculty of Human Ecology & Research Associate, Halal Products Research Institute, UPM, Serdang, Selangor.* amdaud[at]upm.edu.my
b)Senior lecturer at Faculty of Economics and Management and IPPH.
c)Msc candidate at Halal Product Research Institute.
d)PhD candidate at Faculty of Human Ecology, UPM.
e)Senior lecturer, Head of Dept Accounting & Finance, Faculty of Economics and Management, UPM, Serdang, Selangor.
f)lecturer, Faculty of Human Ecology, UPM, Serdang, Selangor.
g)Senior lecturer, Universiti Kuala Lumpur MIIT, Malaysia.

Abstract
An abstract is brief on Halal Industry in Malaysia has created employment opportunities especially among Small and Medium Enterprises (SMEs). High demand for Halal products especially from Islamic countries has put Halal industry as one of the national agenda priorities. In the Eleventh Malaysia Plan (11MP), the halal industry had been given special emphasis by the Prime Minister to ensuring the halal industry is highly and persistently competitive. In Asia, Malaysia has been considered as a leader in the development of the Halal hub center. However, halal industry is not only about halal food production, but also it covers Islamic finance services which prohibit interest (riba), uncertainties (gharar) and gambling (maysir). Islamic financial management is one of the important parts of Islamic finance because it plays a big role in providing Shariah compliant funds and investment opportunities especially for SMEs halal entrepreneur. The holistic approach to halal industry should also cover not only halal food production, but also Islamic financial management which includes activities such as how to create, increase, purify and to protect wealth from Islamic perspective. Therefore, this study examines the relationship between knowledge and acceptance of Islamic finance and the application of Islamic financial management among SMEs halal entrepreneur in Peninsular Malaysia. The findings of this study reveal that the knowledge and acceptance of Islamic finance is significantly correlated with the application of Islamic financial management among SMEs halal operator. This finding indicates in order to integrate the Halal industry with Islamic financial management activities, SMEs Halal entrepreneurs should be able to know and accept the Islamic finance principles. This relationship recognizes the importance of knowledge and acceptance of Islamic financial management among SMEs halal entrepreneur to promote halal products and services and to boost demand for Malaysian halal products image at the international level.

Keywords
Halal Industry, SMEs Halal entrepreneur, Islamic Financial Management

Topic
Entrepreneurship, SME, and Family Business

Link: https://ifory.id/abstract/3h4j2YP968yw

Corresponding Author
Munawir Bintang Pratama

Institutions
Department of Ocean Engineering
Institut Teknologi Bandung, Bandung 40132, Indonesia
munawirbintang[at]gmail.com

Abstract
Tidal flood has been an inevitable coastal hazard for some water-front cities in Indonesia, especially in Java Island. Besides Jakarta – the Capital City, Pekalongan City in the North Coast of Central Java is one of the cities suffered. This paper aims to study the effectiveness of coastal dyke in reducing inundation in Pekalongan City using a numerical hydrodynamic model. The model is performed using Delft-3D equipped with spatial data provided by The Indonesian Agency for Geospatial Information. The model is validated against the observed tidal elevation and shows a good agreement. In the validated model, land subsidence and sea level rise are applied. Also, three scenarios of dyke elevation are studied and simulated in 2020, 2030, and 2050. The results presented are the maximum flood depth and the area inundated per scenario.

Keywords
Tidal flood; Coastal hazard; Coastal dyke; Pekalongan

Topic
Coastal Degradation and Coastal Hazard

Link: https://ifory.id/abstract/Rkat9rfJDHqc

Corresponding Author
Noverita Dian Takarina

Institutions
Department of Biology, Faculty of Mathematics and Natural Science, University of Indonesia, Depok

Abstract
The Sea Surface Temperature (SST) is known as one of prominent factors affecting the concentration of metals in the marine environment. Hence, this research is aiming to study the effect of SST on Zn content distribution in the seawater of Blanakan coast. The Zn was measured from sampled seawater collected from 7 stations. Those stations were representing inshore and offshore of Blanakan coast. The sampled water then analyzed by AAS to obtain the Zn contents. The result confirms a positive effect of SST on Zn contents (r2 = 0.18). An increase of SST from 25 to 31 0C was followed by increase of Zn in seawater from 0.31 to 0.50 mg/l of water. Respectively, all Zn values in Blanakan coast have exceeded the permissible limit of EPA (0.09 mg/l for seawater). The effect of SST on the Zn contents is observed in the offshore rather than inshore water of Blanakan coast. This research also presents a 12 month Zn prediction. Following the SST fluctuation, it is predicted that Zn in seawater will be higher in February-May and lower in July-September.

Keywords
Coast; Metal; Offshore; Sea Surface Temperature; Inshore

Topic
Biology

Link: https://ifory.id/abstract/uebQJRExGmcY

Corresponding Author
Mariati Purnama Simanjuntak

Institutions
Universitas Negeri Medan

Abstract
Abstract. This study aims to examine the effect of PBL used simulation (adobe flash) on critical thinking skills. The research was quasi experimental using pre-test post-test control group design. The population of this study was all of 11th graders at one of SMA in Medan.The sample were experiment class using PBL used adobe flash and control using traditional. The data were collected by critical thinking test based on contextual problem in essay form. The data were analyzed by using t-test. The research results indicated that the pretest score for experimental and control group were 38,93 and 36,25 and the posttest score were 74,45 and 53,95. Based on the result of t-test, there was a significant effect between critical thinking skill with applied PBL used adobe flash. The increase of percentage critical thinking skill in experimental and control were 58 % (in middle category) and 28% (in low category).

Keywords
problem based learning, critical thinking, computer simulation

Topic
Physics Education

Link: https://ifory.id/abstract/dnQrBTWLUCag

Corresponding Author
Alfiansah Sandion Prakoso

Institutions
Universitas Pendidikan Indonesia
(*) irma.rs[at]upi.edu

Abstract
Creative Problem Solving (CPS) is a must-have skill that should be built and developed by the students to be able to compete in the 21st century. CPS is a process to solve a problem faced imaginatively and resulted an effective action. There are 4 aspects that is assessed in CPS which are fact finding, problem finding, idea finding, and solution finding. With an assumption that CPS could be trained and improved, this research aim is to investigate the enhancement of senior high school student-s CPS skill after practicing a STEM based learning. The topic in this research is the concept of momentum and impuls using LEGO® Mindstorm EV3 as the media. This study use a pre-experimental method with one group pretest-posttest design. The sample of this research is 25 senior high school students in Bandung that are determined with cluster random sampling technique. By analyzing the N-Gain, result shows that the enhancement of CPS skill is on the middle category with between 0.31 – 0.63

Keywords
STEM-Based Learning; Creative Problem Solving; LEGO® Mindstorm EV3

Topic
Physics Education

Link: https://ifory.id/abstract/v4GncuFw9eqH

Corresponding Author
Ayi Syaeful Bahri

Institutions
a) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
*nugrahabahri[at]gmail.com
b) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
c) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
d) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
e) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
f) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
g) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
h) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
i) Badan Penelitian dan Pengembangan Daerah
Jl. DR. Wahidin No. 07 A Pacitan
j) PPI Madiun, BPSDM Perhubungan, Kemenhub
Jl. Tirta Raya, Kota Madiun, Jawa Timur 63129

Abstract
The Pringkuku karst area is located at the south-west of East Java. Pringkuku is a transition zone, in the west is the hill karst of mountain sewu and in the east is the structural hills from Gerindulu watershed to the Tegalombo area in the north of Pacitan district. Sampling and sample observations were carried out by considering 4 parameters: structural and non-structural non-clastic limestone from Wonosari Formation (Tmwl) and structural and non structural clastic limestone from Oyo Formation (Tmo). Both of these lithologies were traversed by the fault trending northeast-southwest in the eastern pringkuku region. Non-clastic limestone units consist of calcite and dolomite while clastic limestone units are dominated by calcite. They deposited on shallow-marine zones and have conformity contact. Both of the limestone lithologies undergone process of diagenesis, in non-structural limestones, the crystals still have euhedral forms while in structural units do not have perfect crystalline shapes, almost rounded due to dissolution. Chemical analysis of the two limestones units revealed the content of Ca, MgO and SiO2 and contained dolomite mineral content in several samples from non-clastic units. Based on petrographic studies, clastic units can be classified as lime-packstone and non-clastic units can be classified as lime-boundstone. The results of the petrographic and geochemical analysis showed an increase in quartz content and carbonate micrite in rock samples close to the fault zone and dolomitization in non-clastic units.

Keywords
Petrography; Geochemistry; Oyo Formation; Wonosari Formation; Limestone; Dolomitization

Topic
Geochemistry

Link: https://ifory.id/abstract/7mqZu6jwLH4b

Corresponding Author
Rossy Andini Herindra Putri

Institutions
a) Department of Science Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia
*ekacahyaprima[at]upi.edu

Abstract
People with visual impairment are part of our society who have the same rights as a citizen which has limited mobility. They need technology to help navigation. Arduino is a microcontroller based technology which can be used to be walking assistance. We hereby propose ‘Bluino- as walking support for visual impairment students. It is equipped with an ultrasonic sensor HC-SR04 to detect an object within 50 cm, which will trigger the buzzer to produce sound. Bluino is packed into a custom box with a strap placed on the users leg. Three students have evaluated this device. The result shows that the tool can detect an object or obstacle in front of them so they can avoid it. The sensor can detect an object up to 4 meters and 15 degrees measuring angle. They suggested to improve Bluino by simplifying the model, and enabling the sensor to detect holes.

Keywords
Visual Impairment, Bluino, Arduino, Ultrasonic Sensor

Topic
Physics

Link: https://ifory.id/abstract/Qp7WmqdRAuGt

Corresponding Author
eleonora agustine

Institutions
(1) Universitas Padjadjaran (leo[at]geophys.unpad.ac.id),
(2) Institut Teknologi Bandung

Abstract
This research has been done in the North Jakarta to analyze in soil physical properties as indicators of environmental pollution using geophysical methods based on electricity and combined by chemical analysis. All samples of soil taken from two different sites. The first site is along Jalan Yos Sudarso, and the second site is along the banks of Kali Sunter. The length of each site is one kilometer, with spacing point of soil samples as far as 100 meters. Each samples tested in laboratory to observe a value of Total Dissolved Solid or TDS, Electrical Conductivity or EC, and acidity, by assumed normal condition weather. The results of laboratory tests showed an average value of TDS 118 ppm, EC amounted to 236 microsiemens and acidity is shown to alkaline, which means that the area has been polluted environment. Increasing TDS value is followed by increasing EC value and the graph shows a linear relationship between both of them. Environmental pollution is predicted caused by the contribution of vehicle exhaust fumes and industrial pollution. Pollution pattern tends to increase toward to the north approaching traffic line, harbor and industry. Scanning Electron Microscopy or SEM result showed the predominance of grain shape changes increasingly rounded and the trend of increasing concentration of C, PB and Fe and towards the north.

Keywords
Air Pollution, acidity, EC, TDS, SEM, North Jakarta

Topic
Environmental Magnetism

Link: https://ifory.id/abstract/7G2CjJY9ZXMb

Corresponding Author
Anggun Mayang Sari

Institutions
(a) Research Center For Technology, Indonesian Institute of Sciences (LIPI), Jl. Sangkuriang, Bandung 40135,Indonesia
*anggunmayangsari[at]gmail.com

Abstract
As one of the largest cities in Indonesia, Bandung city consists of dense populations that geologically surrounded by earthquake hazard. Rapid structural-building and infrastructure facilities development forced the local government to put a concern about the dynamic impact. Therefore, a study on Peak Ground Acceleration (PGA) bedrock to analyse seismic hazard is a necessity. This study used the latest updated seismic sources data to model seismic ground motion to particular location. Here, Probability Seismic Hazard Analysis (PSHA) methods were applied using EZ-FRisk and OpenQuake software. These two methods developed to show some variety models of peak ground acceleration value on bedrock. Ez-FRisk models used randomly 9 points locations, while OpenQuake used gridded points to the whole Bandung city to generate PGA analysis. As a result, PGA bedrock using EZ-FRisk software ranged between 0,48-0,62g, while OpenQuake showed 0,46-0,63g. These results validated using Indonesian Hazard Map 2017 using PGA on 2475 years return period, represented similar values about 0.50-0.60g. In order to provide spatial information, these results visualised using Geographic Information System (GIS) application. Furthermore, this study expected to give contribution on scientific information for the development planning, especially for designing earthquake resistant buildings.

Keywords
PGA Bedrock; PSHA; EZ-Frisk; OpenQuake; GIS

Topic
Physics

Link: https://ifory.id/abstract/DHZ8jfnbVkmw

Corresponding Author
Sri Haryati

Institutions
a) Faculty of Teacher Training and Education, Universitas Tidar, Magelang, Indonesia
*sriharyati[at]untidar.ac.id
b) Department of Natural Science Education, Universitas Tidar, Magelang, Indonesia
c) Department of Physics education, Universitas Negeri Semarang, Semarang, Indonesia

Abstract
Higher order thinking skill (HOTs) dan 21stcentury moral values are pivotal skills to be mastered by student collegein todays- digitalized era. These are a part that has to be existing and facilitated during students carrying out the learning process. Therefore, this study aims to develop an instructional model called “Engage, Research, and Present (ERP)” model to promote students having HOTs and 21st moral values. The Fuzzy Delphi Method (FDM) was employed to determine consensus among a panel of several experts. They come from educational and psychological experts (i.e. researchers) and teachers who have experience at least 10 years. They should evaluate the ERP model encompassing 12 sub phases. Five sub phases are included in Engage, five in Research, and two sub phases encompassed in Present. Based on FDM approach, ERP instructional model provides several activities identified facilitating HOTs and 21st century moral values in science and social science learning.

Keywords
HOTs; 21st Century Moral Values; ERP model; Fuzzy Delphi Method

Topic
Integrated Science Education

Link: https://ifory.id/abstract/tYAPar3xuXQw

Corresponding Author
Ibrohim Aji Kusuma

Institutions
a) Graduate School Program, Universitas Negeri Yogyakarta
Jl. Colombo No. 1 Yogyakarta
*ibrohimaji.2018[at]student.uny.ac.id
b) Faculty of Mathematics and Science, Universitas Negeri Yogyakarta
Jl. Colombo No. 1 Yogyakarta

Abstract
Midterm exam is used to asses the extent of students‘ outcomes and mastery level of competencies in half-one semester of learning. This study aims to analyze the characteristics of item test of mathematics midterm exam of 11th grade secondary students. This study was quantitative research using descriptive explorative approach. Midterm test script consist of 40 questions with its answer key and 145 students answer sheets have collected. The midterm script and its answer key ware validated by three expert and students answer sheet was analyzed using classical test theory method using QUEST. The study shows that midtest test script and its answer key was valid with score 0,93 using Aiken indeks and internal consitency score was 0,74. It means that midtest script was feasible in learning but cannot be used to reflect students- knowledges and skills. Fit Pt-biserial score was 52,5% and Low Pt-biserial score was 47,5%. Besides, 4 items ware categorized as difficult problems, 34 items were medium and 2 items were easy problems. The difficult items consist of the arithmetic series related to real problems, infinite geometric series, algebraic limits with substitution of fraction forms containing roots and factorzation of fraction forms containing exponential.

Keywords
Item test characteristics; Midterm exam; Classical test theory

Topic
Mathematics Education

Link: https://ifory.id/abstract/XpkEmCdMvP8T

Corresponding Author
Riezky Probosari

Institutions
Sebelas Maret University

Abstract
This research was conducted to validate and interpret 80-item tests of scientific argumentation skills. The tests tested covered some aspects of argumentation test based on Toulmin Argumentation Pattern (TAP). Fifty three students on their third semester in Biology Education Study Program in Central Java, Indonesia, have participated in this research. The Winsteps software program version 3.73 was used to conduct the Rasch analyses in this research. The results showed that (1) the majority of items displayed match the Rasch model, In the summary of the person response pattern, the infit value and mean square outfit are 1.0 or perfect, infit and z-std outfit are close to the ideal value of 0.0. Person reliability 0.73, means that the consistency of student responses is quite good and items reliability 0.83 means the quality of the items is good. Cronbach alpha value is 0.77, means that the interaction between person and item is good. It also showed the difficulty level of the items given: difficult, medium and easy. It can be said that the instrument can measure students argumentation abilities in every aspect.

Keywords
Argumentation, TAP, Rasch model, assessment

Topic
Biology Education

Link: https://ifory.id/abstract/yRmxdHcPEpuX

Corresponding Author
Siswanto Siswanto

Institutions
a) Department of Natural Science Education,Universitas Tidar, Magelang, Indonesia
*siswanto[at]untidar.ac.id
b) Department of Primary Teacher of Education, STKIP Taman Siswa Bima, Bima, Indonesia
c) Department of Physic Education, STKIP Bima, Bima, Indonesia
d) Department of Physic, Universitas Negeri Semarang, Semarang, Indonesia

Abstract
Argumentation skills have to be mastered and owned by students of college. To investigate these, mapping the characteristics of students- written argument should be revealed. Therefore, this study aims to map how students- written arguments are categorized. A content analysis is a research method utilized in this study. Students written argument of electricity and magnetism from 22 participants are analyzed. The analysis of mapping the written argument is divided into two parts. First, analysis is focused on considering argumentation components without scientific level. Finding of research portrays that level 2 (i.e. Data, Claim and or Warrant) dominates. Second, analysis is emphasized in argumentation components and scientific level of arguments. The result of research depicts that the category of Scientifically Unacceptable-Incorrect Scientific Knowledge (SU-2) is dominant. Its implication is a written argument should be taught to students comprehensively. Both component and scientific level of argument should be mastered by students.

Keywords
Argumentation Skills; written arguments; scientific level of arguments

Topic
Physics Education

Link: https://ifory.id/abstract/XV2wc3zbxWQ7

Corresponding Author
meyliana meyliana

Institutions
Maranatha Christian University

Abstract
The high-quality financial report is considered to be able on reducing information assymetry and also increasing the ability of stockholder to supervise the manager on doing Corporate Social Responsibility (CSR) investment (McDermott, 2011). This analysis aims to verify the quality of financial reports in Indonesia, not only by using the quantitative measurement but also by using the qualitative measurement developed by Braam and Beest (2013). Besides that, this analysis aims to know the effect of high-quality accounting information to the CSR investment efficiency. This analysis uses data from company financial report which is registered in Indonesia Stock Exchange on 2015-2016 and sustainability report which is taken from company-s website. The analysing data techniques in this study are by using multiple regression test and logistic regression. The findings of this study shows that the quality of financial reports using quantitative measurement has a significant positive relation to CSR investment with the probability over investment, in addition has a significant negative relation to CSR investment with the probability under investment. While the quality of financial report using qualitative measurement has a significant positive relation to CSR investment with the probability over investment, and has significant negative relation to CSR investment with the probability under investment.

Keywords
quality financial report, quantitative measurement, qualitative measurement, CSR investment (over/under investment)

Topic
Environmental Integrated Management and Policy Making

Link: https://ifory.id/abstract/M3xkyZKNDv2X

Corresponding Author
Irma Widianingsih

Institutions
Universitas Pendidikan Indonesia

Abstract
Abstract. The aim of research were: (1) making conceptual, functional model and implementing multi criteria evaluation for vocational school zone based on geographic information system, (2) creating data base management system of vocational school zone based on geographic information system, (3) producing thematic map of vocational school zone based on geographic information system. Research location was in Bandung district. The research was conducted on January 2019 to July 2019. The research is using descriptive method. The research population is physical, chemical, biological and environmental conditions. The sampling technique is purposive. Research instruments are measurement and mapping tools, questionnaires, observations, computer hardware and software. Primary data taken by physical, chemical and biological environment. Secondary data taken are maps of soil texture, soil drainage, soil type, erosion, slope, effective depth of soil and flooding. Spatial analysis is used to superimpose layers, using GIS software. Themathic map which was producing multi criteria evaluation for vocational school zone based on geographic information system, from GIS software could be more accurate and effective than conventional and analog method.

Keywords
Multi criteria evaluation, vocational school zone, geographic information system

Topic
Computer Science

Link: https://ifory.id/abstract/8ZTHFyhGcb6E

Corresponding Author
Puji Sucia Sukmaningrum

Institutions
Department of Islamic Economics, Faculty of Economics and Business, Airlangga University

Abstract
The purpose of this research is to investigate the challenges and the impacts of greenbelt as an air pollution control. The impact of Green Belt is to be able to control various environmental problems such as air pollution in urban areas that have become industrialization area, so that the air quality has decreased due to factory activities. But in each procurement of Green Belt certainly has many challenges namely the lack of land for the construction of Green Belt as a result of green open space land that functions as a settlement, industrial, etc. Also, another challenge is the selection of vegetation that sometimes is not appropriate, so that the work of Green Belt is less maximum.

Keywords
Green Belt, Challenges, Impacts, Vegetation, Air Pollution

Topic
Air Pollution

Link: https://ifory.id/abstract/BEnQLwNATzGf

Corresponding Author
Ridwan Fadjar Septian

Institutions
a) Master of Information System, Faculty of Postgraduate, Universitas Komputer Indonesia, Indonesia
*ridwanbejo[at]gmail.com
b) Senior Software Engineer, Horangi Cyber Security, Indonesia
c) Senior System Engineer, Tado.live, Indonesia

Abstract
Big data is related to vast amount of data that could reach more than Gigabytes until Exabyte of data. Nowadays, there are many companies that already achieves exponential data growth that produced by their applications system. The technologies to maintain those dataset is not limited to single instance of database. Majority of those company have been used various tools that could help to maintain their big data system. This paper will be composed by conducting a document review and collect papers that related to big data solution and infrastructure. Afterwards, this paper might be a foundation to conduct another research for big data solution topic. The survey are trying to cover the phases for building a common big data pipelines by following these structures: enterprise vision and mission that affect the big data architecture, defining the data sources that become a center point of the business, building the backend services to collect the datapoint from the data sources, utilize the data pipeline to prevent data loss, consuming the data pipeline message and deliver it to the data storage, build the raw data storage, define business-driven data visualization and analytics, build the ETL (extract, transform, load), build business-oriented data storage, applying statistical and machine learning, perform the business-driven visualization and implementing the monitoring for the big data pipelines. By the end of the study review, The survey will emphasize that there are many big data component that could help the small-medium enterprise to tackle their big data operational issues. And the small-medium enterprise could gain a knowledge to utilize some products from open source and proprietary to help manage their large-scale dataset as a comprehensive pipeline.

Keywords
big data architecture, data engineering, message queue, message streaming, datalake, data warehouse, data visualization

Topic
Computer Science

Link: https://ifory.id/abstract/RA9qWN8j7Fue

Corresponding Author
Sinta Widya Ningtias

Institutions
a) Magister of Mathematics Education, University of Lampung. Jl. Prof. Dr. Sumantri Brojonegoro. No. 1, Bandar Lampung, Indonesia 35141.
*sintawidya.ningtias7[at]gmail.com
b) Department of Mathematics and Science Education, University of Lampung, Jl. Prof. Dr. Sumantri Brojonegoro. No. 1, Bandar Lampung, Indonesia 35141.

Abstract
This study aims to determine students mathematical communication skills in statistical material. The subjects in this study is the VIII grade students selected by purposive sampling. The method used in this research is descriptive. Data obtained from the communication skills tests of mathematical students consisting of three essay contain of three indicator the mathematical communication ability, namely, drawing (expressing their ideas in the form of pictures, graphs and diagrams), written text (giving the mathematically explaination), and the mathematical expression (creating a mathematical model). The tests were given to 30 students of class VIII in SMP Muhammadiyah 3 Bandar Lampung. The data were analyzed quantitative and qualitative to get a comprehensive picture related to students mathematical communication skills. The results showed that the percentage of achievement of students mathematical communication indicator as follows: 1) drawing by 35%, 2) written text by 51%, and 3) the mathematical expression by 42%. Based on the percentage achieved on each indicator, it can be concluded that students mathematical communication ability is low.

Keywords
communication, communication skills

Topic
Mathematics Education

Link: https://ifory.id/abstract/ThtNMkE4ZCbx

Corresponding Author
Neneng Sri Wulan

Institutions
Universitas Pendidikan Indonesia

Abstract
This study is motivated by the importance of early childhood reading readiness as a first step to enter the beginning of reading stages. An ICT-based educational game containing an Indonesia folktale has been choosen to develop the early childhood reading readiness. The study is a descriptive research. The purpose of the study is to produce an educational game for early childhood reading readiness. The result of the study is the availability of an android-based folktale application to stimulate visual and auditory perception for early childhood reading readiness, which is developed using Eclips, Construct, and Photoshop program. This app can be run on android Kitkat OS, 1 GB memory, 480x800 screen. To develop this android app, there are several steps to be taken, including program design, scenario design, and program development. This app consists of Main Menu, About Me, Jungle Adventure, River Adventure, House Adventure, and Play in the Park. This app is interactive so the users can play it by themselves and choose the menus as they wish.

Keywords
android app, folktale, reading readiness, early childhood

Topic
Integrated Science Education

Link: https://ifory.id/abstract/CGnUF6Px473M