bluuebunny/crossref_metadata_2025 huggingface dataset:
Profile of students’ argumentations ability on the topic of environmental pollution
Authors: Ambarawati D S H E , Muslim  , Hernani
Published: May 2020

The purpose of this research was identified argumentation ability profile of middle school students on the topic of environmental pollution. This research was used descriptive quantitative method. The sample used in this research was 29 students of class VII.G in one of junior high school. The research instrument used was 6 items essay questions that have been validated by experts and then analysed using TAP (Toulmin’s Argument Pattern) which consist of some components of argument such as data, claim, warrant, and backing. The results showed that 93.10% of students made claims correctly, 54.02% of students presented data, 48.85% of students wrote warrant, and 45.40% of students completed it with backing. Based on the percentage of students’ argumentation ability, it can be concluded that most students have been able to made claims but some of them have difficulty in expressing data, warrant, and backing. It can be used as a reference for teachers so that in the future they can determine design or learning activities that are not only focused on understanding concepts but also can develop students’ ability in argumentation.
Teacher’s perception on the implementation of education for sustainable development-based learning in senior high school
Authors: Perkasa M , Irwansyah M , Annafi N , Khairunnisa  , Jaharudin
Published: May 2020

This study aims to describe teacher’s perception of the implementation of sustainable development-based learning in chemistry, physics and biology subjects. This research is a qualitative descriptive research. The subjects of the research are the chemistry, physics and biology teachers in nine provinces. The data was collected by using interview sheets, questionnaire and observation sheets. According to the analysis data, the result shows that the term sustainable development is still considered foreign by 77,7% of the teachers, the implementation of sustainable development-based learning can be carried out in very good category by 44,44% of the teachers and in good category by 33,33% of the teachers, and 22.22% of teachers have difficulties in implementing sustainable development-based learning. Other results also show that the concept of sustainable development allows it to be applied in all three subjects with the characteristics of the material relating to the environment. This research can be a recommendation for sustainable science learning.
Self-regulated learning (SRL) design to enhance student achievement in the environmental science course facilitating by e-learning
Authors: Mentari N W T , Subchan W , Supeno
Published: May 2020

This research is based on the characteristics of dependently the second semester students in college who do not have the readiness to learn independently as needed. The purpose of this study is to develop self-regulated learning (SRL) design for environmental science course facilitating by e-learning. This development research was adapted from the 4D Thiagaradjan development model. The results showed that: (1) SRL design consist of seven stages which do in class and online through e-learning; (2) the validation of the learning design concept is 97% and instrument validation is 87.5%, it is concluded that the design good and feasible to be used in the class; (2) there are differences in student learning outcomes, the results of pretest 62 and posttest 75.4, n-gain results are 0.35 or medium category, which means the design is effective to enhance student achievement.
The development of teaching materials use an inductive-based 7E learning cycle for elementary school students
Authors: Amini R , Usmeldi
Published: May 2020

The observation in the fourth grade of Elementary School (SDN 06 Lapai) Padang show that the teaching materials available in elementary schools have not helped students understand the subject matter. Students have not fully carried out activities on student worksheets. Students are not able to answer the questions given by the teacher, so the teacher has not been able to motivate students’ prior knowledge. The research aims to develop teaching materials consisting of syllabus, lesson plan, module, student worksheet, and assessment using inductive-based 7E learning cycle. Research and development use the IDI model which consists of three stages, namely define, develop, and evaluate. At the define stage, material analysis and analysis of students were carried out. At the develop stage, a prototype syllabus, lesson plan, module, students worksheet, and assessment using inductive-based 7E learning cycle was designed. The subjects of the teaching materials trial were fourth grade students in Elementary School. The research instruments were observation sheet, questionnaire, and learning outcomes test. The results showed that the validity of science teaching materials using inductive-based 7E learning cycle was categorized as valid. The practicality of teaching materials was include very practical categories, based on teacher and student responses. Teaching materials was included effective categories based on student activities and learning outcomes. Student activities in learning include very high categories. Learning outcomes most students achieve minimum completeness criteria.
Promoting critical thinking skills of chemistry learning students using preparing doing concluding (PDC) learning models
Authors: Andayani Y , Zulkarnain Z , Hadisaputra S
Published: May 2020

The 21st century learning paradigm emphasizes the ability of students to think at a higher level. Critical thinking skills are one part of these higher order thinking abilities. One of the learning models that can be used to answer these challenges is the PDC model. The PDC model involves students directly in the process of finding facts or information material being taught. This study aims to propoting students’ critical thinking skills using the PDC learning model. The subjects in this study were 68 students of eleventh grade at senior high school at Mataram city, Indonesia. This research is quasi-experimental with research instruments consisting of 5 open ended questions of critical thinking skills. Five indicators considered critical are studied: interpretation, analysis, evaluation, inference and explanation. The results showed that learning with the PDC model able to improve students’ critical thinking skills, especially in the interpretation indicator with N-gain 0.71 in the high category, evaluation with N-gain 0.68 in the medium category, and analysis with N-gain 0.64 in the medium category.
Promoting students’ argumentation skill through development science teaching materials based on guided inquiry models
Authors: Hakim A , Sahmadesti I , Hadisaputra S
Published: May 2020

Argumentation skills are an important practice in science in the 21st century to develop analytic skills and engage in arguments that can construct scientific explanations, develop critical thinking skills and evaluate alternatives. Science learning with guided inquiry model is able to facilitate students in learning to argue. However, good learning must be supported by good teaching materials. So the purpose of this research is to develop junior high school science teaching materials to improve students’ argumentation skills. This research uses the Research and Development (R & D) method which was adapted from Borg & Gall. The parameters used to determine the quality of teaching materials developed are validity and practicality. The validity and practicality of the teaching materials developed were analyzed using Aiken’s V. The results of the feasibility test based on the results of expert validation were obtained by Aiken’s V of 0.75 with valid criteria, while the practicality test results based on teacher and student responses obtained Aiken’s V scores in a row 0.84 (very practical) and 0.80 (practical). In addition, the developed teaching material includes indicators to promoting students’ argumentation skills such as claims, evidence, reasoning, and rebuttal. In conclusion, the teaching materials developed includes the criteria for developing quality products that are valid and practical.
Conceptual understanding of pressure concept through problem based learning in junior high school grade 8th
Authors: Ahied M , Ekapti R F
Published: May 2020

Understanding of a concept can be said as the ability of learners in expressing and re-explaining the information that has been received each learner. The Conceptual understanding of students said good when given the problem, learners can solve the problem well. This study aims to see the improvement of students’ concept understanding during science learning using Problem Based Learning for the concept of pressure in accordance with the curriculum of 2013. The research method used is a pre-experiment with the One Group Pre-test Post-test Design. This research was conducted in one of class 8th grade in junior high school in Sidayu-Gresik, East Java. Aspects of conceptual understanding limited a few aspects, namely translating, interpreting, and extrapolating. The result shows that there is an increase concept comprehension for each aspect of understanding the concept of pressure in accordance with the calculation of n-gain, i.e. the translate aspect is 0.52 with the medium category, the interpreting aspect is 0.62 with the medium category, and the extrapolation aspect is 0.47 in the medium category. Based on the results can be said Problem Based Learning can improve understanding the concept of pressure students Secondary high school class VIII.
The implementation of green education-based comic media on coral reef and its impact on students’ conception
Authors: Sukri A , Rizka M A , Sakti H G , Wahyuni B S , Nasir L M I H M
Published: May 2020

The purpose of this study is to examine the effectiveness of green education-based comic media on understanding the concept of elementary school students in West Nusa Tenggara. This study is a quasi-experimental study using a 2 x 2 factorial design. Two sample schools from Central Lombok and North Lombok district were taken randomly with a total of 85 students from grades IV and V. The experimental class was given treatment by using green education-based comic media, while the control class used conventional methods. Data on understanding students’ concepts was collected through test instruments and then analyzed by using the One Way Anova test with the help of SPSS Version 21 software for Windows. The results showed that (1) the conceptual understanding of students in the experimental class is higher than the control class (p = 0.001 <0.05), and (2) there is no difference in conceptual understanding of students for grade IV and grade V (p = 0.055> 0.05). It can be concluded that the implementation of green education-based comic media can improve the understanding of students’ concepts and can be used for all levels of the class, especially high classes at the elementary school level.
Optimization of first-principles calculation conditions for multiplet energies of Fe3 + and Co3 + in α-Al2O3
Authors: Fusamoto Judo , Ogasawara Kazuyoshi
Published: May 2020

Corundum can contain various transition metals as impurities, for example, ruby. Ruby is used as solid state laser. The prediction of the electronic state of these transition metals is very important for the development of novel optical materials. The CI calculation used finite Slater determinants, the calculated mutiplet energies is overestimated generally. In this study, we optimized the calculation multiplet energy of transition metals in α-Al2O3 by considering some corrections.
Effects of Transition Metal Doping to Cerium-Oxides in Thermal Reduction Reaction
Authors: Nishimura Takaki , Tsutsumi Yuki , Ishii Tomohiko , Kodama Tatsuya , Sakane Genta
Published: May 2020

Considering our lives, novel energy production is so required, and many scientists have been investigated this problem from a lot of views. One of the ways for the new energy productions is the solar power thermochemical production by an oxidation-reduction reaction of the ceramics CeO2 (ceria). In this research, the ceria is used for obtaining an H2 gas in vapor reaction in high-temperature thermal equipment which has a heat production system consisting by focused sun light. Nowadays technology has been also developed to keep a human living, not to harm the Earth environment. From these points, it is realized that how important the H2 gas is for our lives, so we are trying to improve the thermochemical H2 gas production by means of a ceria as a catalyst. Our purpose in this study is, to point out what effects occur in doped ceria’s thermal reduction (TR) reaction by using DV-Xα method. Comparing the models between the pure ceria and the Mn doped ceria, we have realized the difference by the reaction. In this appearance, one of the considerations is a view from p-DOSs (partial-Density of States), in which there are different O-2p DOSs by different crystal structures. From this view, we considered that the ceria structure would become more stable to keep the stable cyclic thermal reaction in Mn doped ceria.
Single-Crystal X-Ray Structural Analysis and Electronic Structures Calculation of Rare Sugar
Authors: Huy Bui Quoc , Ishii Tomohiko , Taniguchi Norito , Nagayama Natsumi , Sakane Genta
Published: May 2020

There are two types of mono-saccharide sugars in nature, which are natural monosaccharide and rare sugar. The sugar that exists in extreme few amount in nature is called as rare sugar e.g. D-psicose and D-allose. The reasons we choose the rare sugar as a research target are because the rare sugar has almost no calories and is very useful for diabetic and dieter patients. Specifically, D-psicose is a no-calorie rare sugar with the sweetness of about 70 % of a sucrose. It has been confirmed that taking the D-psicose with meals suppresses the rise of sugar into the blood. Further, it is very effective in improving and preventing the diabetes. In order to investigate a research on the rare sugars, the first step must be to obtain the correct molecular structure. However, few crystal structures of rare sugars have been reported up to now. Therefore, the purpose of this research is to analyze the single-crystal X-ray structure of unknown rare sugar ‘L-glucose’. In addition, the DV-Xα molecular orbital method is used to compare the differences in a hydrogen bonding between α-D-glucose and α-L-glucose, and to make a novel supramolecular rare sugar.
Data Mining Application with Fuzzy Logic Method for Monitoring Vehicle Position Based on Android
Authors: Ismail Munaf , Dwi Prasetyowati Sri Arttini , Widihastuti Ida
Published: May 2020

Cases of vehicles theft in the Central Java region occurred 869 cases, the percentage was 57.86% against other crimes. To prevent vehicles theft, the police need public participation by increasing awareness of their vehicles. Vehicle theft can occur due to owner negligence and lack of safety locks on the vehicle. This study aims to create data mining application as monitoring vehicle position. The transmitter WiFi 2.4 GHz placed on a vehicle, then measured the RSSI signal by an android application based on fuzzy logic. Indication of theft is that the vehicle is positioned away from the owner, so the signal RSSI is less than -90 dBm. Fuzzy logic monitors this change in distance. When the membership function is lost, fuzzy logic instruct android to activated the alarm. Fuzzy logic was able to make decision give a alarm to user when RSSI signal less than -90 dBm. RSSI signal is less than -90 dBm when the distance is 20 meters if there is a wall barrier, without obstacle the distance is up to 80 meters. RSSI signal is influenced by the measurement environment.
Coulomb blockade transport emerged in quasi one-dimensional PEDOT: PSS fiber
Authors: Akai-Kasaya Megumi , Ogawa Naoya , Kakinoki Soichiro
Published: May 2020

In organic materials, peculiar nonlinearity to current voltage appears, thought a general and comprehensive explanation of them is still controversial. Conductive segments in poorly conductive organic materials are expected to have a smaller electrical capacity, leading to a higher critical temperature for the blockade effect. Here we show an experimental evidence of Coulomb blockade taking place on quasi one-dimensional conductive polymer, PEDOT:PSS [poly (3, 4-ethylenedioxy-thiophene) doped with poly (styrene sulfonate) anions], fibers. The PEDOT:PSS wire grows through electro-polymerization, and bridges between electrodes immersed in EDOT monomer solution. Conducting measurement for the dried fibers shows clear nonlinear behaviour in the current-voltage characteristics as temperature decreases. The non-zero threshold voltage, which increased with decreasing temperature, appears in the current flows through a thinnest fiber. The effective percolative transport passes in thin fiber is able to consists of the connection of the Coulomb blockade islands. By considering both the charge blockade effect and the influence of structural disorder and dimensionality, it is hoped that a clear understanding of charge transport in organic materials can be achieved.
Mechanism of Optical Rotation of Amino Acids Using Electronic State Calculation
Authors: Katsumoto Shuichi , Mimura Manami , Ishii Tomohiko , Sakane Genta , Ogasawara Kazuyoshi
Published: May 2020

Because of the chiral nature of the building blocks of living matter, an optical phenomena associated with the chirality constitute an important topic in physical chemistry. The specific optical rotation, which is a parameter for the characterization of the natural optical activity, depends strongly on the conformation of the molecule. In this study, we investigated the dependence of the optical rotation on a molecular conformation in the gas phase by calculating the electronic states of seven kind of chiral amino acids using the DV-Xα method. As a result, we can confirm the existence of an antibonding orbital on the side chain and the optical rotations are strongly related.
Effect of Molecular Distortion of Ligand Field Splitting in Five-Coordinated Metal Complex
Authors: Fujikawa Yoshiki , Tsuneda Dan , Tsutsumi Yuki , Nakano Momoe , Oguma Takeyoshi , Ishii Tomohiko , Sakane Genta , Ogasawara Kazuyoshi
Published: May 2020

Metal complex indicates the significant physical properties such as magnetism, electrical conductivity and an optical property due to the electronic interaction between the ligand molecule and the central metal ion. We have evaluated the magnetism of the metal complex by controlling the ligand field splitting, which is the energy splitting of the d-orbitals. The magnetic phenomenon of such compounds are realized as a result of the electronic state based on the transition metal coordination complexes, and which can be switched between high spin (HS) and low spin (LS), that is called a spin-crossover (SCO) phenomenon. Our group have been investigated the way how to control the spin state according to the concept of a molecular distortion. The five-coordinated metal complex ML5 has been experimentally confirmed to be a molecular distortion called the Berry pseudorotation (BPR). In the BPR process, both the axial and equatorial ligands can move at the same rate of increasing the angle between the other axial or equatorial ligands in five-coordinated metal complex. The classical BPR mechanism changes its molecular symmetry between two independent trigonal bipyramidals (TBPs) of D3h symmetry via a square pyramidal (SP) of C4v symmetry. The distortion parameters in the five-coordinated metal complexes τ5 are proposed in order to represent the distortion of the BPR process quantitatively. In this work, we predicted the possibility of the SCO phenomenon in intramolecular exchange mechanism through the BPR process in a five-coordinated metal complexes.
Single Crystal X-ray Structural Analysis and Electronic Theory of Sugar Molecules
Authors: Taniguchi Norito , Ishii Tomohiko , Huy Bui Quoc , Sakane Genta
Published: May 2020

Rare sugar is a monosaccharide that there are trace amounts in nature, natural sugars present in large amounts in nature world is referred to as a naturally monosaccharide. Recently, the isomerase called D-tagatose-3-epimerase (DTE) was discovered, and it has a possibility to synthesize quantity of the rare sugar from a natural sugar through the enzymatic reaction. And all of hexoses can be synthesized by four kinds of enzymatic reactions (oxidoreductase, aldose isomerase, aldose reductase and DTE reactions). In this study, single-crystal X-ray structure analysis of a sugar alcohol and its derivative have been performed in order to determine the absolute coordinates of these sugar molecules. We have also investigated the electronic state calculation by means of DV-Xα method using the obtained data of the absolute coordinates. We also consider that mechanism of the enzymatic reaction and intermolecular energy properly such as a hydrogen bond in order to synthesize the supramolecular rare sugars (SRSs) which can be controlled structures and the hydrogen bonds.
Contribution of edge-carbon atoms and non-benzenoid rings in graphitic carbons to π* peak profiles in CK-XANES spectra
Authors: Muramatsu Yasuji , Hirai Yuma
Published: May 2020

In order to analyze the local structure of graphitic carbons by soft X-ray absorption spectroscopy, CK-XANES spectra of polycyclic aromatic compounds having 5-membered pentagonal or 7-membered heptagonal rings were theoretically analyzed by first-principles calculations. Pentagonal rings in the bent graphitic structure take different π* orbital states. Hence, pentagonal rings split the π* peak into two peaks in CK-XANES spectra. Heptagonal rings create electrostatic potential holes in graphitic structures, and the carbon atoms in the heptagonal ring can be regarded as conjugated edge carbon atoms. Hence, heptagonal rings also split the π* peak into two peaks. Edge-carbon atoms split the π* peak into two peaks in CK- XANES spectra. Consequently, carbon atoms in non-benzenoid rings and the edge-carbon atoms in graphitic structures make the π* peak profile wider when compared to graphite.
Design Of Electricity Energy Sources In University Of PGRI Semarang Using Off-Grid Solar Panel Systems
Authors: Kusmantoro Adhi , Novita Mega , Th.Indriati W
Published: May 2020

The source of electricity in each university building in PGRI Semarang is obtained from each distribution transformer or power transformer. The power transformer used to distribute electricity in the central building (GP) has a capacity of 400 KVA, while the power transformer used in the main building (GU) has a capacity of 160 KVA. In the previous study, identification of the quality of electrical power in the PGRI University Semarang building, obtained a low power data factor and a large electrical network harmonics. The problem was solved by designing and installing bank capacitors and harmonic filters. To avoid dependence on PLN electricity and not using a generator when PLN electricity goes out, the source of electrical energy is designed by using solar energy sources through Photovoltaic. Solar Panel as an important component of solar power plants, converts sunlight into electricity. In designing off-grid solar panel systems it is only used at night or when PLN electricity goes out. In the design in the Central Building (GP) four solar panels and a battery unit are needed. Each solar panel unit consists of 14 solar panels and a battery unit consisting of an array of 110 batteries. The simulation results show that the simulation output power is almost the same as the design output power, which is 280,045 Watts. This shows the results of the design can be used to make electricity resources using solar panels. The inverter’s output voltage is also in accordance with the voltage used in the load of the house, which is 220V AC.
A Novel and Fast Memory Perturbation Method to Increase Exploration in Particle Swarm Optimization Algorithm
Authors: Anwar Muchamad Taufiq , Winarno Edy , Chasanah Iswatun , Nugrohadi Saptono
Published: May 2020

Particle Swarm Optimization (PSO), one of the versatile nature-inspired optimization algorithm, continue to suffer from premature convergence despite the numerous amount of research trying to improve this algorithm. Many research had tried to address this issue but often use a complex algorithm which tax on computational time and complexity. This research introduced a novel perturbation method to mitigate premature convergence / to increase exploration while keeping the computational cost at a minimum. The particles’ memories (i.e the position of personal and global best) are modified by a random multiplier which in turn will ‘perturb’ the particles’ velocity. The implementation of this novel perturbation method in early iterations had resulted in 100% success rate in finding global optima in multimodal benchmark tests including the Rastrigin problem - whereas the original PSO failed in all benchmark tests - without adding a significant amount of computational complexity and time.
3d Ions in Solids and Microscopic Crystal Field Effects: Theoretical Analysis and Relations with Experimental Spectroscopic Data
Authors: Brik Mikhail G.
Published: May 2020

The transition metal ions with unfilled 3d electron shell are important activator ions for solid-state lasing and solid-state lighting. Since their spectroscopic properties depend significantly on the nearest environment, studies of the microscopic crystal field effects (influence of variation of the impurity center geometry) acquire additional importance. In the present paper, methods of calculating the crystal field strength 10Dq and its dependence on the interionic distances R are described. Relation between the 10Dq(R) functions and experimentally observed quantities such the Stokes shift is highlighted. The results of performed 10Dq(R) calculations for several crystals doped with various 3d ions are summarized and discussed.
Potential of Ketapang Seed Oil (Terminaliacatappa Linn) as Basic Material Mono-diglyceride Biodegradable Surfactant
Authors: Purwaningtyas Ery Fatarina , Fadilah Khoir
Published: May 2020

Surfactants are widely used in pharmaceuticals, perfumes, cosmetics, food and beverages. One type of surfactant produced from the synthesis of palm oil is mono-diglyceride which can function as an emulsifier. Ketapang (Terminaliacatappa Linn) is a beach tree with a wide spread area, whose seeds have not been utilized optimally. The content of Ketapang seed oil has the potential to be converted into mono-diglyceride surfactant. This study uses experimental laboratory methods, while parameter optimization is done by the two level factorial design method. The raw materials used were Ketapang seeds from around the campus of Semarang 17 Agustus 1945 University, n-butanol solvents, glycerol, MgO catalysts. During the glycerolysis process, 8 run experiments were carried out with 3 variables which changed in temperature (60 & 90OC); MgO catalyst (2 & 4%) and solvent / 10 g oil volume 20 and 40 ml, while the variable is the weight of 25 gram ketapang seed oil; stirring speed of 400 rpm; reaction time of 4 hours; ratio of glycerol 2.5 ml / 10 g oil; and 24-hour deposition time. From the results of the study, the influential variable is temperature. The optimum results were obtained at conditions of 90OC, 4% MgO catalyst, solvent volume of 20 ml / 10g ketapang seed oil and yield 97.9% %. The resulting surfactant has the characteristics of acid number 57.2 mg KOH / gr, saponification number 218 mg KOH / gr. Surfactant has HLB value 14.75, meaning that the surfactant functions as an O / W type emulsifier or as detergent agent.
Damarjati Application for Development of Javanese Language Learning in High Schools
Authors: Suyitno  , Ngatmini  , Wibowo Setyoningsih
Published: May 2020

The background of this study is the difficulty of Javanese high school language teachers in implementing the 2013 Local Content Java Language Curriculum. The problem discussed is how the application of the Damarjati application in the development of HOTS-based Javanese language learning in high school. The objective to be achieved is to describe the standard operating procedures of the Damarjati application in the development of HOTS-based Javanese language learning in high school. The object of this research is the application of the Damarjati application in the development of HOTS-based Javanese language learning with a population of Javanese language teachers and high school students in Central Java. The phenomenological approach applied in this research is carried out by developing products in the learning process with the Content Management System (CMS) format. Based on in-depth studies it was concluded that: 1) the Damarjati application was opened through damarjati.upgris.ac.id.; choose classes and semesters; choose themes and sub-themes, and provide corrections and comments; and 2) the application of the Damarjati application can develop HOTS-based Javanese language learning in high schools through the nggatekake menu, tetakon, naliti, nyoba, ngatonake, and gladhen. Our gratitude goes to the In the 7th International Conference on DV-X melalui Method Committee, through Ms. Mega Novita for her willingness to give our team the opportunity to join this highly qualified international conference.
Extraction Sentiment Analysis Using naive Bayes Algorithm and Reducing Noise Word applied in Indonesian Language
Authors: Jaka Harjanta Aris Tri , Herlambang Bambang Agus
Published: May 2020

Sentiment Analysis is now very important and very useful in machine learning technology where a contextual mining of text to identify and extract subjective information in the source, and in helping to understand social sentiment from comments In general, sentiment analysis can be classified into three broad categories namely sentiment positive and negative. One method of machine learning is the Deep Belief Network (DBN). DBN which is included in the Deep Learning method, is by stacking several algorithms with several extraction features that utilize all resources optimally. This research has two points. First, it aims to classify positive, negative, and neutral sentiments for the test data. The following experiments provide a system of sentiment analysis through the naive Bayes algorithm to calculate sentiment and to improve accuracy by reducing noise in words applied in Indonesian language. From this research, a good level of accuracy can be obtained for extending sentiment using 10-Cross Validation resulting in an accuracy rate of 78.33% with an increase of 6.66% for systems that do not use stopwords, which means reducting noise words and the use of the naïve bayes classification method can be used to determine analysis sentiment on Indonesian language text.
Temperature and Humidity Observation System in ATmega8 Microcontroller-Based Homes
Authors: Latif Abdul , Supriyadi Kuat
Published: May 2020

In our daily life it is sometimes necessary to measure the temperature and humidity of the environment around us. Many kinds of sensors for measuring temperature or humidity, such as LM35, DS18S20 or DHT11. To measure the temperature and humidity of the environment around us, we can choose a sensor that is quite cheap, namely DHT11. DHT11 has a calibrated digital output. This sensor consists of resistive type humidity measuring components and temperature measurements via NTC and is connected with 8 bit uC so that it gives good results, sufficient response speed, has good resistance to interference and is quite cheap in price. The interface used is a single write serial interface which is quite fast and easy. Small sensor size, low power consumption requirements and able to transmit its output within a distance of 20 meters. The disadvantage of this sensor is the lack of accuracy, besides the temperature measurement range is only 0 to 50 degrees Celsius but with a fairly cheap price this sensor can be an alternative to be used in temperature and humidity measurements that do not really need good accuracy. For example measurement of room temperature, measurement of temperature and humidity of incubators and others. If the sensor distance to the uC is less than 20 meters, then a 5K pull up resistor must be installed on the data pin. Meanwhile, if the distance is more than 20 meters, then the size of the pull up resistor should be adjusted. The power supply needed by DHT11 ranges from 3.5V to 5V. Access to the sensor is only allowed more than 1 second after the first power supply is supplied. It is also necessary to add a 100nF capacitor between the VCC and GND pins for the power supply filter.
Design and Development of Heart Rate Per Minutes Based on Atmega16 Microcontroller with Alarm Warning
Authors: Wijaya Nur Hudha , Mujib Achmad Kholilul , Santoso Agung Budi , Supriyadi Kuat
Published: May 2020

Sport is an activity to train one’s body, not only physically but also spiritually, which is useful for maintaining and improving the quality of one’s health. The simplest and most cost-effective exercise is jogging, which is usually done in the morning or evening. Sports activities will stimulate the heart to work extra in pumping blood and will facilitate blood in the body. In order to achieve the maximum benefits, it is really advisable to do sports activities in a regular and well-structured way, because if you exercise excessively, it will be very dangerous if the heart works beyond its normal limits. In this study, a heart rate meter was made which has the principle of controlling and monitoring heart rate per minute, with the hope to make it easier to calculate the heart rate while exercising and provide safety because this tool can inform the normal heart rate when exercising for users. This system is made by using the atmega16 microcontroller as the main module. This monitoring process is carried out by connecting the pulse sensor on the finger whose output is a numeric character on the LCD and the sound of a warning on the buzzer if the heart rate exceeds the normal limit. Based on the results of testing of 20 respondents, the device has been able to calculate heart rate per minute and the buzzer can sound as a warning alarm when detecting heart rate if the heart rate exceeds the normal limit. In addition, the tool designed has a percentage error of 0.72%.
Conjugate Gradient Polak Ribiere In Improving Performance in Predicting Population Backpropagation
Authors: Tinambunan Medi Herman , Nababan Erna Budhiarti , Nasution Benny Benyamin
Published: May 2020

Perform predictive data in the form of time series required a correct method, one method is now often used is the propagation of this method is a method that is able to minimize the error value of the output of the predicted number of people, but still generate quite a lot of iteration that needs to be optimized by minimize iterations and use of time, then the use of conjugate gradient polak Ribiere are expected to minimize the use of time, the number of the epoch of the results of standard backpropagation.
Effect of chitosan-zinc oxide coated in PVDF membrane; morphology and performance testing
Authors: Febriasari A , Siswanta D , Riyanto N , Hidayat Aprilita N , Silvianti F
Published: May 2020

PVDF membrane modification has been done by coating it using chitosan which is mixed with zinc oxide. This study was conducted to determine the effect of chitosan-zinc oxide hybrid on PVDF membrane’s hydrophobicity and performance. The coating has been processed by immersing PVDF membrane into a chitosan-zinc oxide hybrid solution with a ratio chitosan : zinc oxide of 1: 0 (M1), 6: 1 (M2), 4: 1 (M3), and 2: 1 (M4). Membrane morphology characterization was carried out by FE-SEM and FTIR. Water contact angle analysis and performance test was conducted to determine the effect of chitosan and zinc oxide on the hydrophobicity, permeability, percent rejection, and antifouling performance of PVDF membrane. The result of water contact angle analysis shows that the more zinc oxide was added to chitosan-zinc oxide hybrid, the hydrophobicity of membrane was decreased. Membrane performance test shows that the most stable membrane permeability to time is membrane M4, while the membrane with the most stable permeability to pressure is PVDF membrane without coating (membrane M). The best rejection performance ad flux recovery ratio of membranes is shown by membrane M4.
Application of Data Mining Technique using K-Medoids in the case of Export of Crude Petroleum Materials to the Destination Country
Authors: Rahman Fathur , Ridho Ihda Innar , Muflih M. , Pratama Sefto , Raharjo Mokhamad Ramdhani , Windarto Agus Perdana
Published: May 2020

The purpose of this research is to analyze and implement the data mining technique in the export of crude petroleum materials to the destination country. This is because Indonesia is a member of OPEC (Organization of the Petroleum Exporting Countries) which is one of the largest petroleum exporters in the world. It aims to obtain profits in the form of foreign exchange income obtained by the State. The data source was obtained from the Central Statistics Agency (BPS) with the website https://www.bps.go.id for data for 2017-2018. The calculation process The technique used is clustering with the K-Medoids algorithm. The calculation process is carried out using the help of Rapid Miner tools. The clusters used in this study are 2 namely: high cluster (C1) for export of crude oil materials and low cluster (C2) for crude oil materials. The results of the study stated that the high cluster (C1) consisted of 3 countries (Japan, Thailand and the United States) and the low cluster (C2) consisted of 6 countries (South Korea, Taiwan, China, Singapore, Malaysia and Singapore). It is hoped that the research results will be input and information for the government to rearrange policies in order to increase competitiveness, ensure business certainty and the sustainability of domestic industrial raw materials.
Application of MCDM using PROMETHEE II Technique in the Case of Social Media Selection for Online Businesses.
Authors: Iwan Sudipa I Gede , Astria Cici , Irnanda Khairunnissa Fanny , Windarto Agus Perdana , Daulay Nelly Khairani , Suharso Wildan , Lingga Wijaya Harma Oktafia
Published: May 2020

Internet media has become one of the means of product promotion that has very good prospects today. The research aims to recommend the right social media for online businesses. The data collection method was conducted by interview and questionnaire to 300 respondents who conducted online business in Pematangsiantar city by random sampling. Based on the results of interviews and questionnaires obtained assessment criteria namely security (C1), application features (C2), community (C3), ease of access (C4) and response speed (C5). The alternatives used in this research are Facebook (A1), Instagram (A2), Line (A3) and WhatsApp (A4). The settlement method applied is a decision support system with the PROMETHEE II algorithm. The results of the algorithm show that the right alternative for doing online business is Facebook (A1) with a net flow of 0.25 and followed by WhatsApp (A4) with a net flow of ¬0.1. The results of the study are expected to provide recommendations in conducting online business.
Designing smart greenhouse systems using SCADA based on IoT
Authors: Nurjannah D R , Supriadi D , Sutiawan A , Kustiawan I
Published: May 2020

The purpose of this study is to design a smart green home system to help the process of vegetable growth in urban areas by utilizing SCADA and IoT technology. This system can help planting vegetables in urban areas with natural conditions that are not possible and limited land. Using the hydroponic planting method will certainly be very appropriate because it does not need soil as its growing medium. The system that we designed can control and monitor parameters that affect the development of vegetables such as temperature, humidity, nutrition, water level, light, and water use in real time.
SafeDri: A mobile-based application for safety driving
Authors: Maulid H , Nurhidayat W , Priyono S J
Published: May 2020

Globally, around 1.3 million people die every year and more than 50 million people suffer permanent disability due to traffic accidents. This condition has worsened in many countries in the world in line with the high rate of ownership of motorized vehicles. The most common reasons for traffic accidents are distracted driving, over speeding, drunk driving and reckless driving. All those reasons are related with unsafe behaviour while driving. To cope with the problem, we developed a mobile based application that assists driver to drive more safely. The apps will collect information during a stipulated journey and recognize speeding facts, harsh acceleration, heavy breaking, and fuel consumption. While using this application, the drivers will learn how to drive safely, set goals and preferences, get alerts upon over limit violation, and receive feedback on their completed journeys. The results of a usability test on the application indicate that the app managed to identify misbehaviour while driving and rate driver behaviour based on journey history.
Optimization of capacitor capacity to reduce electric power losses in distribution networks in Jampang Kulon Sukabumi
Authors: Nurrizkiani J , Hasbullah H , Saripudin A
Published: May 2020

The electric power system consists of three main parts, one of which is the distribution system. The distribution system has the role of channeling electrical energy from the substation to the consumer. In the distribution of electric power, high reliability is needed so that the quality of electric power is maintained well. There are many factors that can reduce power quality, including power losses. One effort to maintain the quality of electrical power by reducing electrical power losses is to install capacitors on distribution channels. The capacitor is installed as a reactive power compensator so that the power factor approaches 1. In the Jampang Kulon feeder, there are considerable power losses, namely on bus 85-16-1 at 61.6 kW and bus 86-14-1 at 16.5 kW. By determining the capacitor capacity using ETAP, a 3 x 900 kVAR capacitor is mounted on bus 85-16-1 and a 3 x 300 kVAR capacitor on bus 86-14-1. The highest reduction in power losses occurred on buses 85-16-1 and buses 82-17-1. On bus 85-16-1 the power losses have decreased from 61.6 kW to 50 kW (reduced by 11, 6 kW), while on bus 82-17-1, the power losses have decreased from 59.4 kW to 49.2 kW (reduced by 10.2 kW).
GEMONG: A blind drinking aid
Authors: Rustandi D , Fauzi R M , Purwanto L A , Somantri Y
Published: May 2020

The purpose of this study was to design the GEMONG (A Blind Drinking Aid) tool. This device provides information in the form of sound to the blind when measuring water into the glass, starting to fill the water up to the size of the glass by making a sound on the loudspeaker programmed through the Arduino microcontroller. This glass is designed portable and can be washed as desired. The material used to make glass comes from stainless steel with PLA as a mechanical manufacture for the system using a 3D printing machine.
Design and development of telemedicine based heartbeat and body temperature monitoring tools
Authors: Gunawan I P C , Andayani D H , Triwiyanto T , Yulianto E , Rahmawati T , Soetjiatie L , Musvika S D
Published: May 2020

Body temperature and heart rate monitoring based on telemedicine is an electromedical device served to determine the condition of the heart rate per minute (BPM) and the patient’s body temperature in realtime remotely. The purpose of this study is to design the heart rate and body temperature monitor based on telemedicine uses the Internet of Things (IoT). The system allows unlimited distance monitoring by utilizing the internet as a medium for sending the data. The body temperature and heart rate monitoring system uses DS18B20, Arduino, and Raspberry Pi temperature sensors and finger sensors as data processing and transmission microprocessors, LCD Character displays the results of heart rate readings and body temperature per minute. The results of heart rate measurements and body temperature are sent to the database via microservice and displayed on a web page in the form of numerical data and responsive plot graphics on desktops and mobile phones. Based on the measurement and comparison to standard apparatus, the average error of BPM measurement is 0.72%, with a maximum permissible tolerance of ± 5%. While in the body temperature parameter the average difference is 0.3 ° C with a maximum permitted tolerance of ± 1 °C.
IoT based wearable personal air monitoring for sinusitis
Authors: Amani G N , Wahyudin D
Published: May 2020

Sinusitis is inflammation of the cavities around the nose, caused by viruses or allergic reactions of bacteria, fungi, and ARI. Other influential factors are polluting the environment, cold air, and dry. There is no specific device that can help sinusitis sufferers in monitoring air condition. This research was developed to be easy to use for people with sinusitis to be able to display temperature and humidity in real-time using a BME280 sensor and providing action in the form of a humidifier when the humidity is below the set point. The trial results show that the data sent has been successfully received by the output and can turn on the humidifier. From the measurement data obtained, 2,571% error for temperature measurement and 5,898% for humidity measurement. The results of interviews with participants found that this device can help sufferers of sinusitis as a preventive measure if the air condition is not good.
Mini tickets printing machine based on IOT with mobile information using a smartphone
Authors: Lestari S P , Elvyanti S
Published: May 2020

Queue is an event that we often encountered in various places or in public services such as hospitals, banks, restaurants and many more. The restriction of the queuing process is usually due to a long queue thus the process is not enough effective and efficient to the public process. The rapid development of technology that is growing, need the integration between the engine and the mobile information system. So that, we can do a job quickly, and accurately. ESP8266 as a microcontroller and a thermal printer as a ticket printer, both of them can be made a mini machine ticket printer that is small and connected with the smart phone through the Internet connected to the database, so that the user can see directly through the queue number in the smartphone applications. In this paper conducted a mini-making ticket printing machine using ESP8266 based IOT by using a smartphone.
Design of baby growth monitor system in the Posyandu for nutrition status analysis
Authors: Utomo B , Gumiwang H , Soetjiatie L , Triwiyanto T , Oswarida D S
Published: May 2020

Generally, the reporting and recording a nutrition status of infants and baby, which conducted at the Posyandu, is still using the manual system. The problem in the manual system is that the local Health Office cannot monitor the status of infants at the Posyandu. Therefore to support government programs, especially in maternal and child health, an application system is needed that helps to monitor the growth and development of infants and baby. The purpose of this study is to design a system to monitor the infant and baby growth at the Posyandu for Health Office of Surabaya, which further it can be accessed online. This research method was Retrospective and perspective designed, where the development of the growth of infants and baby can be monitored and analysed for its impact. The population and samples were taken from infants and baby in the local Posyandu. The growth monitoring of infants and baby used indicators of nutritional status with the index of weight for ages (BB/U), weight for length (BB/TB), and length for ages (TB/U). In this research, the designs of baby growth monitoring system can be applied well at many Posyandu. In this study, the MySQL and PHP database system data can be integrated into other database systems to support existing reporting systems. Furthermore, this research application can be applied to monitor baby growth in the city and this country.