Indonesia Conference Directory

Corresponding Author
Neza Fadia Rayesa

Institutions
University of Brawijaya

Abstract
The rapid development of Internet technology in this era makes consideration of renewal in business, especially in marketing strategy. A few years ago, agribusiness in Malang began to engage e-commerce services to sell food products such as vegetables, fruits, meat, and so forth. This innovation were getting respond from consumers who make purchases of vegetables online in several start up that sell vegetable online. This study aimed to determine factors behind consumer behavior in buying vegetables online in Malang. Variables were desin using the Theory of Planned Behavior (TPB) and Technology Acceptance Model (TAM) approach. This study used a quantitative approach through a survey method and Structural Equation Modelling-Partial Least Squares (SEM-PLS) was used to analyze the data. Result shown that mostly respondents did purchase by online were because willing to try something new in grocery shopping. Perceived Usefulness (PU) and Perceived Ease of Use (PEOU) wasnt influence consumer intention to make purchases online or make a purchase. Meanwhile, other variables of TPB, such as Atituted Towads Behaviour (ATB), Subjective Norm (SN), and Perceived Behavioral Control (PBC) have significant influences on purchase intention (PI). It was also shown that Purchase Intention (PI) gave significant effect to online vegetable purchasing (OP).

Keywords
e-commerce, online vegetable purchasing, TAM, TPB

Topic
AGROINDUSTRIAL PRODUCTION SYSTEM MANAGEMENT AND REGULATION

Link: https://ifory.id/abstract/ErWa3UzA4tNV

Corresponding Author
Vira Pratiwi

Institutions
(1) Pendidikan Guru Sekolah Dasar, Universitas Bhayangkara Jakarta Raya, Jl. Perjuangan No. 81, Bekasi 17143, Indonesia
(2) Pendidikan Matematika Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia

Abstract
This research was conducted by analyzing the learning obstacles that were found to be used as the development of learning trajectory thinking algebra. Learning trajectories are composed of systematic material about tables and diagrams for elementary schools. Problem modeling is represented through tables and diagrams from concrete to abstract levels. The process of analysis results in an alternative didactic situation that can overcome osbtacles in algebraic thinking. this study is conducted by utilizing a qualitative research with hermeneutics and phenomenology paradigms. This research was conducted by analyzing the learning obstacles that were found to be used as the development of learning trajectory for algebraic thinking. The result of this research is a learning trajectory which is a part of lesson design of algebraic thinking for elementary school.

Keywords
algebraic thinking, elementary schools, learning trajectory.

Topic
Mathematics Education

Link: https://ifory.id/abstract/dnYwzaqvbyJ3

Corresponding Author
Hendrix Yulis Setyawan

Institutions
1Department of Agro-industrial Technology, Faculty of Agricultural Technology. Universitas Brawijaya
2Department of Agro-industrial Technology, Faculty of Agriculture. Universitas Tribhuwana Tunggadewi

Abstract
Biomass is found in large quantities in Indonesia and has the potential to be developed into biofuel. Pyrolysis technology can be used to convert biomass into syngas, which is condensed into pyrolysis oil or known as bio-oil. Biomass is produced in large quantity, do not compete with food, and inexpensive. Current bio-oil research mainly studies the process of converting biomass into bio-oil from inexpensive sources, such as food crops, timber waste and agro-industrial waste. The components of bio-oil are water and organic compounds (hydrocarbons), which are traditionally produced from petroleum. Due to the depletion of petroleum reserves, bio-oil has the potential to be developed into a source of petroleum-supporting fuels. The present study reviewed the status of bio-oil development in Indonesia, including the potential biomass sources, the latest technologies to convert and utilise bio-oil as a fuel, and government policies on the application of bio-oil in Indonesia. This review is expected to be used as a basis for the development of bio-oil policy and scientific and technological utilization of bio-oil in Indonesia.

Keywords
bio-oil, fuel, pyrolysis oil, Indonesia,

Topic
RENEWABLE ENERGY AND BIOREFINERY

Link: https://ifory.id/abstract/Ph2jQGXZMRHK

Corresponding Author
Mayun Erawati Nggaba

Institutions
Program Studi Pendidikan Matematika, Universitas Kristen Wira Wacana, Jl. R. Suprapto No. 35, Nusa Tenggara Timur, Indonesia

Abstract
To describe students critical thinking ability on trigonometric problems, a research was conducted on 30 students (15/16 years old) in West Java, Indonesia. This research is a qualitative descriptive research and data collection technique is written test with 3 description questions. The test results were analyzed using three indicators of critical thinking ability, (1) composing questions with reasons, (2) identifying relevant and irrelevant data of a mathematical problem, and (3) solving mathematical problems with reasons. The results showed that: (1) almost one-third of the number of students can compile the questions with the reasons, (2) more than one-third of students can identify the relevant and irrelevant data of a mathematical problem, and (3) more than one-third of students can solve the mathematical problems with reasons. The average percentage of students on trigonometric problems is 31,86%. Based on the result of research, it is seen that most students do not have good critical thinking ability on solving trigonometric problems.

Keywords
critical thinking ability, mathematical problems, trigonometry

Topic
Mathematics Education

Link: https://ifory.id/abstract/UJhTnzMGK7dW

Corresponding Author
Sri Suhartini

Institutions
Department of Agro-industrial Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Malang, Indonesia

Abstract
Macroalgae is one of renewable marine biomass s feedstocks for substituting land biomass. With the use of anaerobic digestion (AD) technology, macroalgae has been greatly acknowledged for bioenergy production resources, including biogas. On the other hand, batik wastewater contains chemical dyes and organic pollutants, which potentially may cause environmental pollution if disposed without a proper treatment. The aims of this research was to evaluate the potential of biogas and methane production using different ratio of batik wastewater: macroalgae (i.e. Gracilaria verrucosa fresh and dried samples) and to estimate the electrical potential generated. A biochemical methane potential (BMP) test was carried out at temperature of 37 oC for 28 days under batch condition. The results indicated that digesting Batik wastewater alone, without dilution, showed an inhibition process as indicated by a negative net biogas and methane production as well as the specific methane production (SMP). Co-digesting Batik wastewater with fresh marine G. verrucosa samples at ratio of 50:50 cannot produce a high amount of biogas or methane. All samples showed a similar biogas or methane volume compared to that of the inoculum sample. This indicated that an inhibition was occurred limiting the microbial consortia in inoculum to breakdown the organic matter in the feedstock material. This could be due to the salinity of macroalgae and the high organic pollutant concentration in batik wastewater. However, co-digestion of Batik wastewater with dried marine G. verrucosa produced higher SMP. Further alternative options to enhance to utilisation of batik wastewater are needed.

Keywords
anaerobic digestion; inhibition; Gracilaria verrucosa; batik wastewater

Topic
RENEWABLE ENERGY AND BIOREFINERY

Link: https://ifory.id/abstract/9g7DJ36dCkYz

Corresponding Author
La Hasimu

Institutions
Magister Of Management, Faculty of Postgraduate, Universitas Komputer Indonesia, 112-116 Dipatiukur Street, Lebak Gede, Coblong Bandung, West Java, 40132, Indonesia

Abstract
The purpose of this study is to create Business Strategy Of Fishermans Equipment in Wakatobi District. SWOT identification is carried out to identify internal and external factors. TOWS Matrix is used to design strategies based on internal and external factors. The result of the research is a focused business strategy because its produced by considering aspects of strengths-opportunities, strengths-threats, weaknesses-opportunities and weaknesses-threats. this research is expected to be beneficial for businessman.

Keywords
Business Strategy, SWOT Analysis, TOWS Matrix

Topic
Entrepreneurship

Link: https://ifory.id/abstract/3NCM2rEUFXac

Corresponding Author
muhammad fillius ramdan

Institutions
faculty of magister management

Abstract
This research is intended to find out how much influence the atmospheric experience in tourism has on the interest in repurchasing customers in tourism in one of the tourist attractions in Bandung. In its implementation, this study uses descriptive and verification techniques by distributing questionnaires to 100 respondents. The results of this study prove that atmospheric experience affects the interest in repurchasing. The experience of the atmosphere presented by tourist attractions influences the quality of tourist attractions.

Keywords
atmosphere, experience, repurchase decisions

Topic
Management

Link: https://ifory.id/abstract/B9jcwbpmZVP8

Corresponding Author
ibnu hadi

Institutions
Department of Mathematics, Faculty of Mathematics and Science, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta, 13220, Indonesia

Abstract
Let be commutative algebra with unit element and be an -module. Let be class of all pairs of -modules where is direct sum of and contains . In this article we give a method for defining morphism between two objects in so that become category.

Keywords
Category; Supermodules

Topic
Mathematics

Link: https://ifory.id/abstract/jfVaFv39ntzq

Corresponding Author
Naufal Aufa Afaf

Institutions
Communication Science Study Program
Universitas Muhammadiyah Tangerang

Abstract
Abstract— The digital era enlivened by the growth of various social media platforms has become a distinction in the course of democracy today. Social media has implications for the creation of new discourses on the public sphere, network society, and political branding, which in the previous era only touched the off-line world, now transforming towards online. The active involvement of a candidate in the dynamics that occur in the digital world is believed to provide electoral incentives at the end of the fight. The electability of a politician in electoral contestation is also determined by the success of carrying out political branding through a network society formed in the world of social media. One of the forms of political branding on social media is through the hashtag war between candidates who fight. This study aims to see the extent to which social media forms the formation of network society and political branding through

Keywords
Social media, democracy, Network Society, Political Branding

Topic
Political Party and Election

Link: https://ifory.id/abstract/qfXpmLaG2FPn

Corresponding Author
Riser Fahdiran

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, West Java, Indonesia.
2Research Center for Climate Change, Universitas Indonesia, Depok, West Java, Indonesia.
3Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jalan Rawamangun Muka No. 1, 13220 East Jakarta, Indonesia.

Abstract
Black-winged myna (Acridotheres melanopterus) is an endemic species from Indonesia. Nowadays, the bird can be found only in Java and Bali islands, and it is important to make sure that the breeding centre is effectively breeding the bird to help the decreasing population wilderness. There is no difference between male and female based on the morphological characteristic. It can be a problem for the breeders to identify the sex when they have to pair the bird. The aim of this research is to identify the differences between male and female black-winged myna based on morphometric characteristic. There are weight, length, width, circumference, and the spread of the wings. The data is processed using principal component analysis (PCA) on the SPSS 20 program. The samples are 71 black-winged myna with minimum two years of age from breeding facilities in Java and Bali islands. Based on the research, morphometric characteristic that distinguishes male and female bird mostly is their wingspan and their weight. Morphometric characteristics of the female myna are smaller than the male. This result is essential for breeders to minimize the risk of pairing the same sex bird.

Keywords
Endemic species; morphometric; black-winged myna

Topic
Biology

Link: https://ifory.id/abstract/aUXc9QKAHybt

Corresponding Author
Riser Fahdiran

Institutions
1 Department of Biology, Faculty of Mathematics and Natural Sciences of Universitas Indonesia, Depok 16424, West Java, Indonesia
2 Department of Biology, Universitas Negeri Jakarta, Jl. Rawamangun Muka, East Jakarta, 13220, Indonesia

Abstract
Regression of the corpus luteum (CL) is characterized by loss of the capacity to synthesize progesterone (P4) and tissue degradation by apoptosis (functional and structural luteolysis). Luteinizing hormone (LH) is one of the most potent stimulators in progesterone production by corpus luteum (CL) of most mammals, including cow. This research hypothesized that LH suppresses apoptosis of bovine luteal steroidogenic cells (LSC). We examined the effect of LH on cell death such as cell viability and DNA fragmentation factors which related with apoptosis. Cultured bovine LSC obtained from the CL at the mid stage (Days 8–12 of the cycle) were treated for 24 h with recombinant human tumor necrosis factor alpha (TNF; 2.9 nM) and recombinant bovine interferon gamma (IFNG; 2.5 nM) in the presence or absence of LH (0.34 nM). LH reduced the levels of cell death in the LSC induced by TNF and IFNG (P<0.05). Furthermore, DNA fragmentation induced by TNF and IFNG was observed to be suppressed by LH. In conclusion, LH affects viability of luteal cells as an anti-apoptotic factor in bovine CL by increasing cell viability and suppressed DNA fragmentation. This suggests that LH plays luteoprotective roles in bovine CL by suppressing apoptosis of LSC.

Keywords
Luteinizing hormone; supress apoptosis; bovine luteal cells

Topic
Biology

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

Corresponding Author
Riser Fahdiran

Institutions
1Department of Biology, Faculty of Mathematics and Natural Science, University of Indonesia, Depok, IDN

2Biology Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Rawamangun, Jakarta Timur, Indonesia, 13220

Abstract
Microplastics (MPs) is the most contamination problem on the marine environment. Small pelagic fish like anchovies are one of the organism which exposured by microplastics, yet reported contamination on Indonesian anchovies is lacking. Here, the investigation result from anchovies digestive tract (Stolephorus spp.) sampled (n = 15). The total microplastics contamination from Talisayan harbor, East Kalimantan is 366 ± 3,51 particles/individual. Kind of microplastics size range detected as categories: < 20 µm, 20-50 µm, 50-500 µm, 500-1000 µm, and >1000 µm. Most of microplastics shapes from Talisayan harbour are microfilm (50%) and microfiber (29,59%). The type of polymers are confirmed by Fourier transform infrared (FTIR) spectroscopy as polypropylene, high-density polyethylene and foamed polystyrene nylon. Our findings reported that spesific size range (50-500 µm) is the most majority of microplastics size range which are ingested by anchovies from Talisayan harbor. The microplastics are more dangerous if another contamination found together on it. On this investigation, the mercury contamination also tested and the result showed as not detected mercury contaminant. The anchovies are had the economic value and also small pelagic fish which are play as prey for the other big fish. The exposured are possible to the human by contaminated seafood diet.

Keywords
Ingestion; microplastics; anchovies

Topic
Biology

Link: https://ifory.id/abstract/9ezW836LxXCM

Corresponding Author
Riser Fahdiran

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences., Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
2Biology Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Rawamangun, Jakarta Timur, Indonesia, 13220

Abstract
This research focused on the amount of abundance of microplastics in the sea hare Dolabella auricularia as well as the seagrass fields along the southern coast of Pramuka Island. Sampling of 8 individuals of Dolabella auricularia along with seagrass Cymodocea rotundata leafblades was done at the southern coast of Pramuka Island, after which the samples were preserved and brought to a laboratorium in Depok for microplastic analysis. The sea hares- digestive tracts were extracted and dissolved in strong nitric acid. A 1 cm2 portion of a seagrass leaf blade was cut for observation. Prepared samples were observed under a monocular microscope and further analysis was done. Microplastic fibers and film particles were found in highest abundance within the digestive tracts of each sample of Dolabella auricularia as well as on the seagrass surface where the sea hare obtains its algae from, with fragment particles found in much lower amounts. Overall, number of microplastics was found between 40.1 to 73.7 particles/g weight of sea hare digestive tract and the estimated amount of microplastic found at seagrass leafblade was 185 particles/cm2. Results provide evidence that microplastics in the ocean brought by water currents could adsorb on to algae through which it enters the food chain as it is consumed by marine biota.

Keywords
Pramuka Island, Dolabella auricularia, sea hare, Microplastic, seagrass

Topic
Biology

Link: https://ifory.id/abstract/QcWXhDbm3C9z

Corresponding Author
Yuyu Yuhana

Institutions
a,b,c,d Mathematic Education Department, University of Sultan Ageng Tirtayasa, Serang, Banten
*hepsinindiasari[at]yahoo.co.id

Abstract
Pedagogical knowledge of prospective mathematics teachers is very important to be mastered, but still students of prospective teachers are still low in relation to the tightening. In addition, prospective teacher students are rarely trained to develop reflective thinking skills. Reflective thinking is very important to sharpen critical thinking skills and other high-level thinking skills. Scaffolding is assistance given to someone and if the person has been able to help it is gradually reduced. Thus teaching materials are needed to develop the ability of reflective thinking for pedagogical knowledge. This study aims to look at the effectiveness of Scaffolding interactive teaching materials in the ability of reflective thinking on pedagogical knowledge of prospective mathematics teachers. This research method is quasi-experimental with noneqivalent pretest-postest control group design. This study uses 2 classes which are given interactive Scaffolding teaching materials and the other classes apply ordinary teaching materials but are guided by scaffolding. The instruments used were tests, questionnaires, and interviews. The conclusion of this study is that the reflective ability associated with pedagogical knowledge provided by Scaffolding interactive teaching materials is better than those using ordinary teaching materials with Scaffolding.

Keywords
Scaffolding, Interactive, Reflective, Pedagogic

Topic
Mathematics Education

Link: https://ifory.id/abstract/2KcjyvE8hrtb

Corresponding Author
Martin Bernard

Institutions
a) Fakultas Pendidikan Matematika dan Sains, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia
*pamartin23rnard[at]gmail.com
b)Fakultas Ilmu Pendidikan, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia

Abstract
Mathematical deterministic algorithms are a method for solving mathematical problems that are appropriate in every step of an algorithm. Where each student will make steps from the questions given, then they make the right decisions to link the relationship of mathematical language into the language of the ActionScript 3.0 program through several processes so that the goal of media creation is achieved as a result of the implementation of the algorithm. The purpose of the method is to provide student knowledge of the meaningfulness of mathematics learned can be implemented in everyday life. Students can make their own decisions to make the right strategy in solving problems, Students learn to develop their own different processes to the right results. ActionScript 3.0 is a programming language based on ECMAScript which is a standard language program developed by ECMA (European Computer Manufacturer Association) that provides a student or prospective teacher to make a product in the form of more interactive images or animations as innovative learning media and learning enrichment applications Internet. Of course the development is based on students creative abilities to achieve the objectives of various processes in the form of algorithms made, after which results are tested, checking and observing steps that need to be corrected if an error occurs or added if there is a need to develop, finally students give the right conclusions from the process beginning to end process.

Keywords
Mathematical Deterministic Algorithm, ActionScript 3.0 Adobe Flash, Student Creative Reasoning Capabilities

Topic
Mathematics Education

Link: https://ifory.id/abstract/2RND8pbxhjKL

Corresponding Author
Martin Bernard

Institutions
a) Fakultas Ilmu Pendidikan, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jendral Sudirman, Cimahi 40526, Indonesia
*sitiruqoyyah13[at]gmail.com
b) Fakultas Pendidikan Matematika dan Sains, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jendral Sudirma, Cimahi 40526, Indonesia

Abstract
This study aims to examine the achievement and improvement of metacognitive abilities and mathematical dispositions of elementary students in terms of Higher Order Thinking Questions by applying VBA MS-based applications. Excel. This research is a quasi-type experiment with the design of One Group Pretest-Posttest Design. The population in this study were all fifth-grade elementary school students in Cimahi City, while the sample was determined using a purposive technique. The instrument used consisted of tests of metacognitive abilities and mathematical dispositions. The results showed that (1) There were achievement and improvement in metacognitive abilities and mathematical dispositions of elementary school students in terms of Higher Order Thinking Questions by applying VBA MS-based applications. Excel; (2) Students who get learning by applying VBA MS-based applications. Excel to see the metacognitive abilities and mathematical dispositions of elementary school students viewed from the Higher Order Thinking Questions, grew a positive attitude towards mathematics; (3) Students who get learning by applying VBA MS-based applications. Excel is increasingly active in learning, giving rise to high motivation and interest in learning.

Keywords
Metacognitive Ability, Mathematical Disposition, and VBA-Based Applications Excel

Topic
Mathematics Education

Link: https://ifory.id/abstract/N6htvBJeAyGD

Corresponding Author
Martin Bernard

Institutions
a) Fakultas Ilmu Pendidikan, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia
*sukmamurni19[at]gmail.com
b) Fakultas Pendidikan Matematika dan Sains, Institut Keguruan dan Ilmu Pendidikan Siliwangi, Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia

Abstract
This study aims to determine the increase in verbal-linguistic intelligence of elementary students in solving mathematical problems by applying mathematics learning based on VBA PowerPoint (PPT) integrated with Science, Technology, Engineering, and Mathematics (STEM). The method used in this study was quasi-experimental One Group Pretest-Posttest Design carried out in one of the elementary schools in Cimahi City. Data collection was collected using pretest and posttest for verbal-linguistic intelligence in solving mathematical problems and student questionnaires on VBA PPT and STEM. Based on data analysis of verbal-linguistic intelligence students in solving mathematical problems experienced a significant increase with VBA PPT-based learning integrated with STEM. The overall response of the students showed that almost all students stated that they were very happy with ICT-based learning such as VBA PPT integrated STEM, and they were more interactive and very memorable to gain experience following the stages of learning given to create high motivation and interest in learning.

Keywords
Verbal-Linguistic Intelligence, VBA PowerPoint, Science, Technology, Engineering, and Mathematics

Topic
Mathematics Education

Link: https://ifory.id/abstract/DVeY2TZUxtuw

Corresponding Author
Silvia Fitriani

Institutions
1. Pendidikan Matematika, Universitas Batanghari Jambi, Jl. Slamet Riyadi, Jambi 36122, Indonesia
2. Universitas Sriwijaya, Jl. Srijaya Negara, Bukit Lama, Palembang 30139, Indonesia

Abstract
This paper reports on a survey of the classroom assessment practices of Jambi city primary school teachers in mathematics education. We investigated, using questionnaire, how teachers- assessment methods, purpose, and beliefs about the usefulness of assessment are related. In total 100 teachers at 80 from 3 primary schools responded to the questionnaire. Observation-based assessment methods of questioning, observing, and correcting written work, were the most frequently – that is weekly – applied methods, whereas instrument-based methods, particularly using textbook test and student monitoring tests were employed several times a year. Teachers used assessment mainly for formative purpose and they considered the assessment methods they used themselves as most relevant.

Keywords
Classroom assessment; primary school; mathematics education; survey study

Topic
Mathematics Education

Link: https://ifory.id/abstract/uyJn4NQFZxRe

Corresponding Author
Dewi Ratnasari

Institutions
IKIP SILIWANGI

Abstract
Based on the results of previous observations in SMAN 13 Garut, the daily math test results on functional derivative material are still under the KKM.The method used was the classroom action research method.The Procedure was formed in a cycle with taking research as much as three cycles, each cycle had two meetings in learning activities.Data collection techniques were through observation, mathematical comprehension tests, and documentation. The subject of this study were students of class XI MIPA 3, a total of 32 students.The success indicator in this study is if there are 85% or more students in the class get an average value of 75 and the students average activity is 75% or more than the students that have a good category. Based on the results of the study,the activities of students in cycle I was obtained in sufficient categories, the second cycle was in a good category, and in the third cycle in the excellent category.While the results obtained before the prasiklus average value is 61.2 with a 46,7% completeness level. In the first cycle,the average value was 65.5 (56.25%).Cycle II the average value was 73.0 (71.88%).And in the third cycle, the average value is 79.5 (87.50%).

Keywords
resiprocal teaching, concept understanding

Topic
Mathematics Education

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

Corresponding Author
Nabila Khansa

Institutions
Sriwijaya University

Abstract
This study aims to describe about problems that measured students- mathematical thinking aspect reasoning in topic relation and function. The subjects in this study were three students in grade 8 who were taken randomly. There are three problem-solving questions used in this study. The study is design research with the focus is mathematical thinking aspects reasoning. The research methods of this study consist preliminary design, focus group discussion (FGD), trials, observations and interview, and retrospective analysis. The indicators of measuring mathematical thinking aspect reasoning are deductive, inductive, and logical analysis. Based on the indicators, then from the 3 questions given, the students were able to do inductively in question number 1 and the conclusion is correct. Whereas in question number 2, students are not able to solve the questions well so there is no indicator of reasoning appears. Meanwhile for question number 3, indicators of deductive reasoning and logical analysis appears, but students still have difficulty in drawing the right conclusions.

Keywords
Mathematical Thinking, Problem-solving question, Reasoning

Topic
Mathematics Education

Link: https://ifory.id/abstract/gme27d8LEZP6

Corresponding Author
Cecep Mahmudin

Institutions
IKIP SILIWANGI

Abstract
The aim of this study is to improve the mathematical connection capacity of SMAN 13 Garut students in trigonometry materials that have been done by the teacher from cycle by cycle with deductive approach. This research makes up by a classroom Action Research conducted in 3 cycles. Each cycle consists of 4 stages, The subjects were the students of class X IPA 6 in the academic year 2018/2019 where the researcher was a Math teacher in the class. The data research was obtained through observation, questionnaires, and tests. The analysis of data technique is a comparative descriptive. The result of the test concluded that the implementation of class actions through a deductive approach in material for trigonometry can increase learning motivation and connection skills mathematics students. This is based on the results of tests and observation of students- learning motivation there is an increase in motivation to learn mathematics from the former low to quite high. it is suggested to the teacher to be able to apply the learning model with a deductive approach to learning in his class.

Keywords
Learning Motivation, Mathematical Connection Ability, Deductive Approach

Topic
Mathematics Education

Link: https://ifory.id/abstract/AurDYcbwT7ME

Corresponding Author
Riza Yuliratno Setiawan

Institutions
a) Department of Fisheries, Faculty of Agriculture, Universitas Gadjah Mada, Jl. Flora Gd. A4, Bulaksumur, Yogyakarta 55281, Indonesia
*riza.y.setiawan[at]ugm.ac.id
b) Department of Oceanography, Faculty of Fisheries and Marine Sciences, Diponegoro University, Jl. Prof. Soedarto, S.H., Tembalang, Semarang 50275, Indonesia
c) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya. Jl. Palembang - Prabumulih, Km. 32, Inderalaya, OI, Sumatra Selatan, 30662, Indonesia

Abstract
Long-term satellite data (2003-2017) are analyzed to investigate the variability of ocean surface chlorophyll-a (Chl-a) concentration off the Halmahera Island under influence of the Indonesian Australian Monsoon and the El Niño-Southern Oscillation (ENSO). In this study, we first analyzed the seasonal variability of Chl-a, and then describe the relationship between sea surface Chl-a, sea surface temperature (SST), and sea surface wind stress in the region. Our results demonstrate that prevailing northerly and southeasterly wind stresses play a pivotal role in generating Chl-a maxima off the Halmahera Island. On seasonal time scale, the strengthening of northerly and southeasterly wind stresses (up to ~0.01 N m-2) during the Northwest and Southeast Monsoon seasons produce enhanced phytoplankton blooms associated with sea surface cooling (~28.8 °C) in the area of study. On interannual time scale, the largest positive Chl-a and wind stress anomalies and the coolest SST anomaly are observed in 2006 during El Niño event. Meanwhile, the greatest negative Chl-a anomaly is prevailed during the 2016 negative IOD event. This study demonstrates that wind variability is the essential factor in determining the magnitude of Chl-a maxima off the Halmahera Island.

Keywords
Chlorophyll-a; ENSO; Halmahera Island

Topic
Coastal and Ocean Dynamics

Link: https://ifory.id/abstract/u8QchJ6arb3Y

Corresponding Author
ADIM FIRMANSAH

Institutions
a) Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Indonesia
*aripriharta.ft[at]um.ac.id
b) Centre of Advanced Materials for Renewable Energy, Indonesia
c) Department of Computer Science and Information Engineering, Southern Taiwan University of Science and Technology, Tainan City, Taiwan

Abstract
This paper presents a battery management system on a self-powered smart shoes application. We developed an energy saving method to extend battery life through duty cycle. The proposed method used sleep feature on IoT device to optimize power transmission, data reduction/compression, and network configuration to reduce network authentication time. We conduct several experiments for testing the overall performances and compared the proposed method with the conventional method. The obtained results show that our proposed battery management system could reduce energy consumption up to 50%.

Keywords
battery management system; energy consumption; lifetime; self-powered IoT; smart shoes

Topic
Energy Storage

Link: https://ifory.id/abstract/fBCFW3Rue9gN

Corresponding Author
ADIM FIRMANSAH

Institutions
a) Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Indonesia
*aripriharta.ft[at]um.ac.id
b) Centre of Advanced Materials for Renewable Energy, Indonesia
c) Department of Computer Science and Information Engineering, Southern Taiwan University of Science and Technology, Tainan City, Taiwan

Abstract
This paper presents an adaptive method for power management in smart shoes data transmission. Adaptive here means that the power for data transmission can be adjusted by selecting the shortest path. We use the Fuzzy Method to develop this adaptive system. Exchange of data between nodes scattered in smart and moving shoes with users can be set by Fuzzy placed on the sink. Sink collects data and sends it to the cloud. Based on our experiments on sports fields with several users with relaxed, brisk and running modes show very significant power savings compared to previous methods. The average energy efficiency can reach 35% better than the previous methods.

Keywords
adaptive; fuzzy; power saving; smart shoes

Topic
Energy Storage

Link: https://ifory.id/abstract/Hzdyt6RTh7Xr

Corresponding Author
Nur Muhammad Nashrullah

Institutions
Chemical Engineering Depatement, Faculty of Industrial Technology, Institute of Technology National Malang, Malang City

Abstract
Making a drink mix fruits and vegetables from the red spinach,red bean,guava and beet fruit can be a way to enhance iron content of their products, and will raise the value of favorite of the society towards it. This study aims to determine the right formula of the variation of composition fruits and vegetables and temperature levels drying against iron and find out acceptance to the society in powder fruit and vegetable drink mix. Methods used to make a drink mix fruit that is a Foam-Mat Drying method. Based on an analysis of the iron, the best conditions exist to variation composition 40% of guava at temperature drying 60 oC with 6,05 mg/100g of iron content. The temperature drying affecting the iron and vitamin C in mixed fruits and vegetables. Based on the hedonic organoleptic test, mix fruits and vegetables can be well accpted by the society for its color from variations composition 40% of red bean (60 oC), the aroma of 40% of guava (60 oC), and the taste of 40% beet fruit (50 oC). So it can be concluded that variations composition fruit that is produced with compisition of the 40% of guava.

Keywords
Mix fruits and vegetables, red spinach, red bean, guava, beet fruit, iron and vitamin C

Topic
Chemical Engineering

Link: https://ifory.id/abstract/bZAtQpRGz4yk

Corresponding Author
SITI ROSNITA SAKARJI

Institutions
UNIVERSITI TEKNOLOGI MARA, MELAKA BRANCH, MALAYSIA

Abstract
This research is conducted on purpose to examine the internal customer satisfaction level through service quality of Majlis Perbandaran Seremban (MPS). A survey on internal customer satisfaction level through service quality was conducted among internal staff in MPS involving 260 respondents. The attributes of service quality such as reliability, assurance, responsiveness, tangible and empathy have been identified in order to investigate whether or not these factor have significant relationship with customer satisfaction. From this study, the researcher able to determine the current level of internal customers satisfaction that they perceive from service provided by Majlis Perbandaran Seremban (MPS), from this research the researcher has found that among the elements tangible has become the most significant relationship toward customer satisfaction.

Keywords
Internal customer, Service quality, Customer satisfaction

Topic
Management

Link: https://ifory.id/abstract/NQZwfdACJ29V

Corresponding Author
Yohanes Jakri

Institutions
STIKES Santu Paulus Ruteng

Abstract
Given its nature of providing health services to the public, hospitals must be equipped with services of high quality. To improve the quality of services, education and training needs to be done for nurses who work in the Hospital. One of the methods used for improving the quality of hospital services is coaching method. This study aims to determine the significant impacts of coaching upon working motivation and nurse performance and the direct impacts of coaching upon nurse performance through motivation of nurses in Saint Rafael Cancar Hospital, Manggarai Regency. The method used in this study is quantitative Pre-experimental design with one group pre-posttest. This study took 30 respondents using systematic random sampling, and the data were collected using questionnaires. Data were analyzed using path analysis method with three variables, coaching as an independent variable and motivation and nurse performance as the dependent variables. The results of the research shows that coaching has a direct and significant impact upon motivation with a standardized direct effect 0.969, direct and significant impact upon the nurses performance with a standard direct effect 0.922, direct and significant impact upon motivation and performance of nurses with standardized direct effects 0.848 with P value 0,000 < 0 05, and Coaching has indirect and significant impact to the performance of nurse through motivation with R2: 0.737. Based on the research, it can be concluded that there is a significant impact of coaching upon motivation and nurse performance. There is a significant impact of coaching upon nurse performance through motivation. The output of the research hypotheses implies that the better of the coaching to the nurses, the better their motivation and performance will be.

Keywords
Coaching; motivation; performance of nurses.

Topic
Leadership and Healthcare Systems

Link: https://ifory.id/abstract/Zf3yUYmqT84e

Corresponding Author
Agung Kuswantoro

Institutions
Universitas Negeri Semarang (UNNES)

Abstract
The purpose of this study is (1) to find out the commercial letters used in Handayani Mart (2) to find out which commercial letters are not used in Handayani Mart. In this study is using descriptive qualitative approach. Commercial letters used by Handayani Mart are sales-purchase agreement letters and employment contract. For other types of commercial letters such as letters of request for offers, offers, orders, announcements, and certificates made by digital / electronic means. Suggestion in this study are for managers of Handayani Mart should make a central or centralized letter application so that the letter are same in their management, both letters for internal and external requirements.

Keywords
commercial letter and district era

Topic
Economics Education (Accounting, Cooperative and Office Administration Education)

Link: https://ifory.id/abstract/3qwM9fZAp8Cx

Corresponding Author
Adi Firman Ramadhan

Institutions
Universitas Diponegoro

Abstract
The purpose of this study is to examine the effect of double job member of audit committee at remuneration committee on audit fees. This study refers to the Kalerkar (2012), by modifying the use of control variables and research samples. The dependent variables of this study is audit fees, the independent variable is double job in membership of audit committee at remuneration committee, this study also uses control variables to determine audit fees, there are audit risk, audit complexity, auditor characteristics, and audit committee characteristics. This study uses secondary data from annual reports and financial reports of all banking sector companies listed on the Indonesia Stock Exchange (IDX) in 2014-2017. The research sample was taken by purposive sampling method. The total sample in this study is 41 companies. The analysis method used in this study is the multiple linear regression analysis. The results of this study indicate that double job in membership of audit committee at the remuneration committee negatively affects the price of audit fees

Keywords
Audit Fees, Audit Committee, Remuneration Committee, Double job membership of audit committee at remuneration committee

Topic
Accounting

Link: https://ifory.id/abstract/zB7qmTERjG8C

Corresponding Author
Endah Nurhawaeny

Institutions
a) Universitas Muhammadiyah Cirebon
Jalan Tuparev No. 70 Cirebon
*endah_nk[at]yahoo.com
b) Universitas Sebelas Maret
Jl. Ir. Sutami No.36 A, Pucangsawit, Kec. Jebres, Kota Surakarta, Jawa Tengah 57126

Abstract
At present, the company is required to manage the impact of corporate activities to enable the creation of sustainable development. The sustainable development will certainly only be achieved if since the companies manage the impact of operations on three levels of impact: 1) economy, 2) social and 3) environment. The social mapping method or social mapping used includes Data Study, In-depth Interview, Survey, Location Search (Transect), FGD (Focus Group Discussion) and Secondary Data. Based on the results of social network mapping the strength of formal institutions in Ciwaringin Village is an institution that is legally within the authority of the Village. The role of formal institutions such as Pemdes, BPD, LPMD and MUI, PKK and Karang Taruna is very meaningful for the progress of village development. Analysis of social networks and the degree of importance of each stakeholder have the strength of each actor who is able to move the masses. Stakeholder analysis found that Pemdes were in constructive positions. Identification of social problems is a social problem such as the problem of poverty in the Ciwaringin Village. The mapping results based on FGDs can be grouped into three categories of poverty, namely the poor, the near-poor and the vulnerable groups. Besides the problem of poverty, the problem of unemployment is also a social problem. From the identification results, the average number of unemployed people in Ciwaringin Village is 0.9% in each RW in Ciwaringin Village. Besides identifying social problems, Ciwaringin Village also has social capital that can be used as a potential in overcoming problems in Ciwaringin Village such as social capital, human capital, physical capital, natural capital, and financial capital. The average social capital owned by the village of Ciwaringin is quite good and runs as it functions.

Keywords
Corporate Social Responsibility, Social Mapping, Community Empowerment

Topic
Sustainable development

Link: https://ifory.id/abstract/DxjgfeBUa9XL