bluuebunny/crossref_metadata_2025 huggingface dataset:
Implementation of python source code comparison results with Java using bubble sort method
Authors: Insanudin E
Published: November 2019

In the implementation of Python and Java source code comparison results are more focused on the scale of the ratio of the number of lines of code, file capacity, and access speed. As for the background of this writing because there are so many programming languages that can be used with the same results but overall we do not know which programming language is more optimal and efficient in terms of the number of lines of code better known in the programming language is LOC (Line of Code) capacity of file access speed. In this study, the authors focus only on Java programming language and python course as a first step to know the ratio of the number of lines of code, file capacity, and access density. To determine the comparison there is a method used is bubble short. The results of the implementation of the comparison of these programming languages for Python programming language to produce the number of LOC (line of code) or the number of lines of code as much as 10, the capacity of the file extension.py by 506 bytes and txt extension of 397 bytes and access speed approximately for less more 4 seconds. While Java produces the number of LOC (line of code) or the number of lines of code as much as 11, the capacity of the file extension. Java of 86.2 Kbytes and extension txt of 477 bytes and access speed for 7 seconds. So do not close the possibility to make other applications python programming language will be more optimal and efficient.
Developing an interactive multimedia of network topology based on visual, auditory, and kinaesthetic learning model for vocational students
Authors: Junaeti E , Munir  , Mulya S , Erlangga
Published: November 2019

Network topology is a knowledge in basic network subjects that is often disregarded to be grasped by almost all vocational students whose learning activities are dominated by practicum. Whereas network topology is a basic concept that is important in order to comprehend the concept of networking further. This research was aimed to develop a concept and design of interactive multimedia of network topology to be implemented in visual, audio, and kinaesthetic (VAK) learning model. This study used the overall life cycle method to develop multimedia. The design of this media adopts the constitutive elements of situated learning in interactive multimedia. The multimedia features correspond to Gagne’s events which serve well as a framework for the successful development of educational multimedia modules. The experiment was carried out at the vocational school Binawisata Lembang, Indonesia, involving thirty tenth grade students majoring in software engineering as the research subjects. The result of the experiment was then analyzed using a quantitative method approach. It was revealed that students’ perceptions of the media were very good. Based on the results obtained during experiment, the developed media was proven to have positive impacts on improvement of students’ cognitive abilities.
In-service teachers’ perception towards Education for Sustainable Development (ESD) in Myanmar
Authors: Aye S , Win Y M , Maw S S
Published: November 2019

This study was carried out to explore Myanmar lower secondary school teachers’ perception on Education for Sustainable Development (ESD). The research focused on the teachers’ level of ESD awareness and knowledge, their attitudes towards ESD, and their willingness to adopt ESD within their classroom setting and as well as their teaching skills. The sample consisted of 248 lower secondary school teachers of thirty schools in Sagaing Township, Myanmar. The Five-point Likert scale questionnaire was developed. Its reliability was measured by Cronbach’s alpha. The results indicated that, in general, the teachers have positive attitude towards ESD and willingness to adopt ESD in their teaching subjects. However, the participants’ level of awareness of ESD concepts is rather low and they do not understand ESD concept clearly. They do not have adequate teaching skills for integrating ESD concept into their teaching subjects. The findings also revealed that although there is no significant difference in the level of awareness and knowledge of ESD concept and attitude towards ESD, level of science teachers’ teaching skills in integrating ESD into science topics is higher than that of other subject teachers, and a significant relationship exists in three variables: teachers’ knowledge of ESD concept, attitude towards ESD and their teaching skills respectively. These findings might be useful as a baseline survey in implementing in-service science teacher training program integrated with ESD in Myanmar.
Enhancing critical thinking skills and information literacy of students through integrated science teaching materials
Authors: Fairuz T , Kaniawati I , Sinaga P
Published: November 2019

Critical thinking and information literacy are skills that need to be developed to deal with the challenges of the 21st century. This study aimed to enhance critical thinking skills and information literacy of secondary school students through developed integrated science teaching materials in theme interaction of light with organisms. This study used quasi-experimental methods and the matching-only pre-test – post-test control group design. Subjects of this study were eighth-grade students. This research used two classes selected purposely with experimental class using developed teaching materials and control class using teaching materials commonly used in school. There were two instruments applied in this study, critical thinking skills test and information literacy test. Data was analysed by normalized gains, Cohen’s D, and t-test. Based on the results of data analysis, it could be concluded that, the used of developed integrated science teaching materials was effective in enhancing critical thinking skills and information literacy.
Validation of science virtual test (SVT) to assess 9th grade students’ critical thinking on living things and environmental sustainability theme
Authors: Rusyati L
Published: November 2019

Critical thinking, communication, collaboration, and creativity are four skills that required for 21st century education. This descriptive research is focus on students’ critical thinking and specifically how to validate the science virtual test (SVT) to assess that skill. There are 21 students (9 grade/15 years old) in Kuningan city West Java as the participants while science teacher and expert as the validators. The science virtual test (SVT) as a research instrument has constructed in multiple choice based on eight elements and 26 sub elements critical thinking. Critical thinking which developed by Inch et al. consists of eight elements namely question at issue, purpose, information, concepts, assumptions, point of view, interpretation and inference, implication and consequences. Curriculum analysis, expert judgment, legibility test and trial test are four steps in this research. The test item criterion based on trial test are accepted, accepted but need to be revised, and rejected. The reliability of the test 0.43. It means the SVT that used is reliable to assess 9th grade students’ critical thinking.
Implementation of cooperative integrated reading and composition (CIRC) to enhance mathematical argumentation ability of mathematics teacher students
Authors: Rosita C D , Kusumah Y S , Suryadi D , Kartasasmita B G
Published: November 2019

This study aims to analyse whether there are differences in the enhancement of mathematical argumentation ability between students who received Cooperative Integrated Reading and Composition (CIRC) learning and students who received conventional learning. The research method chosen is quasi-experiment using non-equivalent control group design. Data analysis techniques used are descriptive statistics and inferential statistics. The results show that the average enhances the ability of students’ mathematical argumentation who received CIRC learning are better than students who received conventional learning. When reviewed based on PMK (Prior Mathematical Knowledge), a mathematical argumentation ability of upper and middle PMK group students in CIRC learning classes are better than students’ mathematical argumentation in conventional learning. Nevertheless, students’ mathematical argumentation ability in the lower PMK groups between the CIRC learning class and the conventional learning class is not different.
The implementation of problem based learning (PBL) model viewed from mathematical connection competence on x year students of vocational high school
Authors: Fatimah F N , Riyadi  , Sari D R
Published: November 2019

The study aimed to prove the implementation of Problem Based Learning (PBL) model having better achievement than conventional model in improving students’ mathematic connection competence. The method used is qualitative with control group doing pretest and posttest. Population of the study were X year students of vocational school in Kabupaten Sukoharjo. The sample was X year students of SMK Pelayaran Pancasila Kartasura. Instrument used was test of mathematical connection ability. The result showed that with significance level α = 0,05 showed that Problem Based Learning (PBL) model was better significantly than conventional learning model to improve students’ mathematic connection ability.
Cognitive style and gender differences in a conceptual understanding of mathematics students
Authors: Kusumaningsih W , Saputra H A , Aini A N
Published: November 2019

This study aimed to analyze the understanding of mathematics concepts of cognitive style students based on gender in the matrix material. This research is descriptive research with a qualitative approach. The data collected from high school students of class XI in a cognitive style of male and female. The technique of data collecting used in this research are tests, interviews and also equipped with documentation. The data analysis techniques in this research are data reduction, data display and conclusion/verification. The data validity used triangulation technique. The results showed that cognitive style between male and female students have a similarity understanding of mathematics concepts in indicators that give examples or examples of the counter of the learned concepts and have differences in understanding of mathematics concepts; redefine the concepts in mathematics; connect the various concepts in mathematics as well as outside mathematics; identify the characteristic of procedure or theory and present the idea in various forms of mathematical representation. Based on data analysis, it can be concluded that the understanding of mathematics concepts of cognitive style on the male is better than on the female.
Error analysis of college students in calculus learning
Authors: Khairani  , Mukhni  , Aini F Q
Published: November 2019

Calculus is one of many courses in college that must be mastered by students. But, students faced difficulty in calculus learning. There were many students who failed in calculus course. They could not answer calculus problem correctly and made mistakes. Purpose of this study was to describe students’ error in calculus learning based on Newman Error Analysis. Type of research was descriptive qualitative. Sampling was done by purposive sampling. Sample was 29 students who took calculus course in 2018. Instrument was students’ answer worksheet of calculus test. Result shows that students have different type of error in solving calculus problem.
Ethnomathematical review of Toraja’s typical carving design in geometry transformation learning
Authors: Nugraha Y S
Published: November 2019

Toraja’s typical carving as one of the nation’s culture wealth does not only have a philosophical meaning, but also contains mathematical elements in relation to the concept of geometry transformation. Ethnomathematics is a process of presenting the mathematical ideas possessed by traditional societies on various socio-cultural activities that can be observed as a mathematical activity. The mathematical exploration of Toraja’s typical carving design such as Pa’tedong, Pa’barre Allo, Pa’manuk Londong, Pa’ Sussu’, and other developmental designs is an alternative learning model that can be applied in school. This is an important effort to preserve the national culture and as a cultural education to the younger generation. This is a qualitative research with ethnography approach to reveal philosophy and mathematical concept which is found on Toraja’s typical carving design.
The effect of students’ perception on classroom assessment to students’ attitudes
Authors: Syaifuddin M
Published: November 2019

The objectives of this research were to analyze the students’ perceptions on classroom assessments, the differences in the students’ perceptions on classroom assessment based on gender and lecturers, and the effect of students’ perceptions on classroom assessment to their attitudes. The subjects were UMM students who attended Descriptive Statistics course. The data were collected using a Students’ Perception of Assessment Questionnaire (SPAQ) and attitudes questionnaire. The SPAQ and attitude questionnaire were reliable. Mixed method used in this study. Descriptive method was used to analyze students’ perception on the classroom assessment. The independent sample t-test was used to test the differences in students’ perceptions on classroom assessments by gender and lecturers. The linear regression analysis was used to examine the effects of students’ perceptions on classroom assessment to their attitudes. The results of this study showed that the students’ perceptions on classroom assessment were positive for all aspects, except for the students’ perceptions on their ability to prepare for the test on assignments and feedback. There were no difference perceptions of the students on classroom assessments based on gender and the lecturers to all aspects of classroom assessments and the students’ perceptions on classroom assessment influenced the students’ attitudes.
Enhancing mathematical connection ability of mathematics education student through inquiry-based learning
Authors: Handayani A D , Herman T , Fatimah S , Setyowidodo I
Published: November 2019

As a pre-service mathematics teacher, the student of mathematics education is required to have high order thinking skills. A part of high order thinking skills is the ability of a mathematical connection. The purpose of this study is to analyse the improvement of student’s mathematical connection ability as a result of the implementation of inquiry-based learning. This research is a quasi-experimental research involving two classes. The first class as the experimental group which get Inquiry learning and the second group is the control group which get the conventional learning. The sample of this research is students who take the course of Numerical Method. The data have been obtained and then analysed by using t-test. The results of this study show that the ability of mathematical connections of students in the class that using inquiry-based learning is better than the students in the class that using conventional learning.
Prospective teachers’ mathematical resilience after participating in Problem-based Learning
Authors: Ariyanto L , Herman T , Sumarmo U , Suryadi D
Published: November 2019

The main goal of this study is to improve mathematical resilience of prospective math teachers through the implementation of Problem-based Learning. This study is a quasi-experimental using non-random of pretest and posttest control design. 57 prospective math teachers from Universitas PGRI Semarang are taken as the sample of this study. The data needed to achieve the goal of this study are taken from documentation, observation, interviews, students’ worksheets, and pre and post responses. The results of the analysis show that mathematical resilience in prior knowledge of mathematical category of high, medium and low of the students who experienced study using Problem-based Learning and overall is improved. This students’ mathematical resilience improvement belongs to low category. This study can be taken as consideration for another researchers for doing further research which is in the same vein as this study.
Experience of novice teachers to present mathematical problems
Authors: Ramadianti W , Priatna N
Published: November 2019

Mathematical problems are important in mathematics learning. Teachers should give students the opportunity to solve the problem. Novice teachers face some obstacles to present mathematical problems in their class. This study aims to describe the experience of novice teachers to present mathematical problems for their students. This article discusses the barriers experienced by novice teachers to present math problems. This research is qualitative research. The data were collected through interview five novice teachers. The results of this study reveal that novice teacher rarely present problems in mathematics learning. The low mathematical understanding ability of students are the main obstacle of novice teachers. Novice teachers assume that presenting problems affect students to be more confused. The findings of this study indicate that learning mathematics by novice teachers have not instructed students with problem-solving ability maximally. For further research, it is necessary to analyse the ability of novice teachers in preparing mathematical problems.
Student pedagogical content knowledge through project based learning models
Authors: Sumartini T S , Rahayu D V , Noordiana M A , Lurytawati I P , Mardiani D
Published: November 2019

Lack of Pedagogical Content Knowledge (PCK) of a teacher becomes a problem in the implementation of mathematics learning. Therefore, it is necessary to make appropriate efforts in developing PCK among students as a form of formal education and as a provision for teaching in the future. One effort that can be done is the use of Project Based Learning (PBL) models. This study uses a quantitative method with the quasi-experimental design (the pretest-posttest non-equivalent group design). The sample used was students of mathematics education study program at the Institut Pendidikan Indonesia (IPI) Garut. The results of the study show that student PCK as a prospective mathematics teacher who gets a PBL model is better than students who get conventional learning models. In addition, the development of PCK needs to be accompanied by the development of knowledge of mathematical content as a whole of the teacher’s competence in teaching mathematics.
Information systems of logistic management: a case study
Authors: Andry J F , Loisa J
Published: November 2019

Established in 2005, XYZ Cargo, a Freight Forwarding and an agency Company specialized in the logistic, shipping in Jakarta. Experience in both ocean freight and air freight agency which more than sixty branch of partnership around the world. XYZ Cargo has operated Information Systems (IS), IS make it possible for company to get the right output to the right people at the right time by increase the interaction between the company’s people, the data collected in its various IT/IS systems. This paper primarily deals with the role of Logistics in Jakarta. Framework of thinking used systems development life cycle (SDLC) is a method by which the systems can be developed in a systematic manner and which will enhance the probability of completing the IS project within the time deadline and maintain the quality of the IS product as per the standard. Expected from the implementation of this information systems logistic management can achieve several objectives desired by user requirement, the IS to be more effective and efficient, provide convenience in terms of process data and information. Implementation of IS compared to the manual process of recording which facilitates decision-makers to be able to monitor transactions and report in a short time.
The influence of scientific creativity and critical worksheet (SCCW) on project based learning to increase cognitive ability, scientific creative skills and scientific critical skills senior high school students on sound wave problem
Authors: Kartika S , Saepuzaman D , Rusnayati H , Karim S , Feranie S A
Published: November 2019

The aims of this study to determine the effect of SSCW on project based learning in improving the cognitive abilities, students’ scientific and scientific creative thinking skills on sound wave problem. The research method used is pre-experimental research with randomized control group. The research phase involves preparation, execution, and final stage. At the preparatory stage is a preliminary study, RPP preparation, and instrument validation by 4 expert validators. At the implementation stage is done in one high school in Bandung with pretest, the implementation of learning using project based learning with conventional student worksheet (CSW) and SSCW, then given the final test (posttest). The study participants were 22 students of both control class and experimental class in one of high school in Bandung. The instrument used is the instrument of cognitive ability and scientific thinking as well as scientific critical thinking skills. Implementation of SCCW on project-based learning can improve creative thinking skills and critical scientific and cognitive abilities of students with greater improvement than the application of SCW on project-based learning.
Enhancing students’ cognitive ability by implanting argumentation activity on inquiry lab
Authors: Siswanto  , Yusiran  , Gumilar S , Hartono  , Subali B , Muhlisin A , Juliyanto E , Trisnowati E , Farikah
Published: November 2019

The purpose of this study is to acquire depiction of cognitive ability enhancement which the laboratory activities based inquiry implanted argumentation activities was conducted as a main process in the classroom activities. A quasi experiment method with non-equivalent control group pretest-post-test was carried out to implement this treatment. The participants of this study were students grade XI in one of public senior high schools in Indonesia. They were divided into two groups, experimental and control group, using purposive sampling. Experimental group was provided great opportunities to conduct laboratory activities based inquiry implanted argumentation activities while control group uses laboratory activities based inquiry. In order to recognize the cognitive ability of students, an instrument was developed in form of multiple choices. This study revealed that the mean difference of two groups was significantly different in which students’ cognitive ability of experimental group was higher than this control group and was in medium criteria from normalized gain perspective. From this findings, implanting argumentation activities on inquiry lab played prominent role in constructing model and theory of knowledge for students in enhancing their cognitive abilities.
Developing the physics magazine as an alternative of personal learning media
Authors: Sulisworo D , Ristiani A , Kusumaningtyas D A
Published: November 2019

Recently, information technology literacy of the student in school is relatively high. Efforts to provide learning services that match the characteristics of the millennium generation will be one of the solutions to utilize this technology effectively in learning. Various open educational resources will significantly enhance personal learning activities; one of them is the physics magazine. This study is development research that aims to produce physics magazine on the subject of momentum, impulse, and collision. Learning features provided in this magazine include reading the concept, enrichment reading, crossword puzzles, multiple choice, essays, practicum, and so on. Various alternative activities are provided so that students can learn from anywhere they like. Physics experts and media experts validate this media. The result scores are 3.67 for the physics subject aspects and 4.18 for the media aspects out of 5. It shows a reasonable level of eligibility. Furthermore, this magazine was piloted on 26 students to see the level of interest in physics learning using this magazine. The result is a high level of interest (4.27 out of 5). It means that student can use this physics magazine to enhance the learning interest in physics.
Identifying kindergarten children’s idea about heat and temperature concept
Authors: Qonita  , Syaodih E , Suhandi A , Maftuh B , Hermita N , Handayani H , Nurafifah R , Ningsih A R , Gumala Y , Maulana D , Samsudin A
Published: November 2019

This study aim is to identifying the childrens’ idea of the heat and temperature in their daily activity. Heat and temperature is the physic concept that easily found in children daily life. Knowing children idea is important to fix misconception because they bring the concept by themselves experience. A descriptive-qualitative design with observation has been implemented to gather data from 44 (5-6 years) children in three kindergartens in Tasikmalaya. The result showed that the children in early years understanding temperature as qualitative notion that they can sense rather than qualitative notion. Some case children use the same terms to describe the different temperature. This result can give description about children’s prior idea related heat and temperature to avoid or fix the misconception in the next level education.
Development of four-tier diagnostic test (FTDT) to identify student’s mental models on static fluid
Authors: Kafiyani F , Samsudin A , Saepuzaman D
Published: November 2019

Four-Tier diagnostic test on some previous studies are usually used to diagnose misconceptions and conceptual change. In this study, the four-tier diagnostic test (FTDT) has been used to identify students’ mental models on static fluid. Based on the mastery of students concept on static fluid, mental models will have classified into three categories: 1) initial model, 2) synthetic model and 3) scientific model. The research method utilized is the Dick and Carey model, which has four steps: 1) development of analysis diagnostic test, 2) diagnostic test design, 3) implementation and 4) evaluation. The instrument has been collected to 28 students at senior high school in Bandung. Result study shows that students mental models, which are Initial model (20.5%), synthetic-partial understanding model A (8.9%), synthetic-partial understanding model B (30.4%), synthetic-partial understanding model C (17.3%), synthetic-misconception model (11.3%) and scientific model (11.6%). It can be concluded that four-tier diagnostic test (FDTD) is able to identify student’s mental models in static fluid.
Development of computer simulation-assisted conceptual change model (CS-CCM) to change students’ conception on gas kinetic theory
Authors: Azizah N , Samsudin A , Sasmita D
Published: November 2019

This study aims to develop computer simulation-assisted conceptual change model to change students’ conception on gas kinetic theory. This study has been conducted to senior high school students because gas kinetic theory is an abstract concept, so that the conceptions usually increase misunderstanding and misconceptions of students. The research development has been implemented in the ADDIE development model. The ADDIE model consist of: Analyse, Design, Develop, Implement, and Evaluate. Respondents in this study amounted to 26 students (average age of 17 years old), who came from one of high school in Belitung. The test instrument used is three tier open ended questions consisting of 7 questions and the results of the test were categorized into five categories consisting of misconception (M), not understanding the concept (NU), sound understanding (SU), partial understanding (PU), and not being encoded (UC). The results show that CS-CCM can be designed and developed to facilitate change students conception on gas kinetic theory. Thus, it can be concluded that the development of CS-CCM is able to facilitate conceptual change of students’ conception on gas kinetic theory.
Investigating the ability of multiple representations and scientific consistency of high school students on newton’s laws
Authors: Furqon M , Muslim
Published: November 2019

The ability of multiple representations and scientific consistency are two things closely related to students’ conceptual understanding. The research has been carried out aims to find out the ability of multiple representations and scientific consistency of high school students in Newton’s laws. The multiple representations measured includes verbal, vector, motion map, graph, and bar chart representations. The scientific consistency measured is the consistency of students in correctly and consistently answering each of the three questions which presents different representations. The research method used is survey. The research instruments used were a multiple representations test consisting of 5 items to measure multiple representations ability and Representational Variant of Force Concept Inventory (R-FCI) test consisting of 27 items. The research samples consisted of 102 students from class X, XI, and XII at SMA Negeri 14 Bandung who were selected using stratified random sampling technique. The data obtained were analyzed using the Zipgrade Item Analysis Tool and R-FCI Consistency Analysis Tool. The results showed that the type of representation that is most mastered by students is vector representation and most students are categorized as inconsistent.
Computer simulation-assisted conceptual change text (CS-CCT): a FODEM study on fluid dynamics
Authors: Putra G D , Samsudin A , Saepuzaman D
Published: November 2019

Previously, the development of CCT has been conducted since the previous decade until current age. However, the latest version of CCT has several weaknesses in such aspects as: the visualization of abstract phenomena and it has seldom been assisted by computer simulation. This research aims to develop Computer Simulation-Assisted Conceptual Change Text (CS-CCT) by way of a continuation of the previous research combined with computer simulation. A Formative Development Method (FODEM) has been utilized to obtain a valid and comprehensive data collection. A FODEM consist of three components that are: (1) needs analysis, (2) implementation and (3) formative evaluation. Participants were occupied from 33 students who studied in one of Senior High School located in Bandung city. Participants were taken using random sampling techniques. Data obtained from the results of the pre-test using the four tier-test instruments and classroom learning. Then, the data codification technique was conducted to distinguish students based on 5 levels of conception. The result shows that CS-CCT is able to be designed and developed in term of facilitating students to change their conceptions. Thus, it could be concluded that the development of CS-CCT is able to facilitate students conceptual change on fluid dynamics conceptions.
Unveiling students’ misconceptions through computer simulation-based PDEODE learning strategy on dynamic electricity
Authors: Samsudin A , Azura  , Kaniawati I , Suhandi A , Fratiwi N J , Supriyatman  , Wibowo F C , Malik A , Costu B
Published: November 2019

Several misconceptions occur in the students’ conceptions especially in the dynamic electricity concept. Misconceptions is a student’s understanding which are un-appropriate with the scientific conceptions. Furthermore, if the students’ misconceptions have not been unveiled, they could be a problem in the next learning process. As a consequence, misconceptions are important faced to be changed so that students hold true conceptual understanding. In term of unveiling students’ misconceptions, we highly need the learning process which is able to make students could understand the concept themselves. Researchers have been utilised computer simulation-based PDEODE (Predict, Discuss, Explain, Observe, Discuss and Explain) learning strategy. The purpose of the research is to unveil students’ misconceptions through computer simulation-based PDEODE learning strategy on dynamic electricity. This research has been implemented using quasi experiment with pre-test and post-test group design. The sample who are involved in this research are consisted of 27 high school’s students in the one of Bandung Barat regency and they are taken by purposive sampling technique. The research result state that the frequency of students’ misconceptions decreases 0.21 in the low category. It can be concluded that the computer simulation-based PDEODE is able to unveil students’ misconceptions on dynamic electricity.
Profile of physics laboratory-based higher order thinking skills (HOTs) in Indonesian high schools
Authors: Ismail A , Setiawan A , Suhandi A , Rusli A
Published: November 2019

The existing physics laboratory is a pivotal part of teaching and learning physics. Several skills required by students can be facilitated by physics laboratory such as HOTs. However, the conventional laboratory that leads to verification laboratory was not successful training students dealing with HOTs. This present study investigated profile of physics laboratory-based HOTs in Indonesian high schools. A case study was conducted to take several data from participants. The participants of this present study are 12 physics teachers and 32 students in Indonesian high schools. A Questionnaire and HOTs test are used to garner the data. The finding research reveals that there four main obstacles to train and develop laboratory activities-based HOTs: the limitation of time to conduct laboratory activities, the limitation of lab space, the low ability of physics teachers in designing laboratory activities-based HOTs, and low knowledge of students dealing with concepts and laws of physics. These obstacles also support another result which depicts the low of use of HOTs lab and low achievement of students’ HOTs. A consideration of this result present study opens deep insight and wider context in a new form of laboratory activities in Indonesia that is augmented reality laboratory.
Development of basic physics experiment based on science process skills (SPS) to improve conceptual understanding of the preservice physics teachers on Boyle’s law
Authors: Saepuzaman D , Utari S , Nugraha M G
Published: November 2019

The study was motivated to develop Basic Physics Experiment (BPE) to improve preservice physics teachers understanding on Boyles law. The method used Research and Development (R&D) and involving preservice physics teachers as many as 18 students in the first year and 11 students in second year. This Study uses Student Worksheet (WS) based on Science Proses Skill (SPS). The conceptual understanding will be evaluated multiple choice tests for concepts Boyle Laws. The Result of the first year showed that student achievement in observation, inferring and hypothesis aspect of SPS not optimally. The result of conceptual understanding 46.67. In the second year, some activity and worksheet of SPS were develop based on the finding in the first year. Based on second year data showed improvement of SPS students and the result of conceptual understanding on Boyle Laws 78.86. Based on the results, it can be conclude that the development of basic physics experiment based on science process skills to improve conceptual understanding of the preservice physics teachers on Boyles law.
Study on Application of Optimum Index Factor in the Electric Power Benchmarking
Authors: Yao-ping Wang , ye xin Tan , Bin Song
Published: November 2019

Benchmarking is a widely used method of enterprise management, which can improve the management efficiency as well as the competitiveness of enterprises. In the process of electric benchmarking, a great deal of data that generated by multiple links such as power generation, transmission, substation, distribution, consumption and dispatching are not fully utilized. Accordingly, much effective information are not efficiently obtained. Aiming at this and to give a comprehensive consideration to the various factors of the power system, the method of data mining based on hierarchical optimum index factor is proposed to give priority to the development of a suitable electric benchmarking system to appraise the benchmarking professional index. This method takes various factors into account comprehensively and quantifies the development priority hierarchy of indexes. It is simple in form and also easy to calculate so that the key index can be figured out easily. Thus it can enable electric power companies to better determine the key emphasis in work, improve the efficiency of benchmarking management and fully play the role of benchmarking management.
Operating Elements of UK Electricity Contract Market and Its Enlightenment to China
Authors: Renjie Sun , Tianran Li , Jie Ding , Jinlong Zhang
Published: November 2019

The United Kingdom is the birthplace of the world industrial revolution. Its marketization of the power industry has been going on for more than 20 years. It is a developed country with a relatively mature power market system. The UK electricity market reform has experienced the Power P00L model, the New Electricity Trading Arrangements model, and the British Electricity Trading and Transmission Arrangements model. Since the NETA model, the UK has formed a power production-transaction-regulatory system centered on bilateral transactions. China is undergoing market-oriented reform of the power system. In order to break the monopoly, the main contents include changes in the development concept of the traditional power industry, the establishment of a new mechanism for direct trading between power generation enterprises and users, the establishment of an independent and reasonable transmission and distribution mechanism, and the opening of private capital into the electricity market, and so on. This paper introduces the reform process of the UK electricity contract market, summarizes the substantive elements and mechanism elements, lists the operation elements of the current UK electricity contract market, and analyses the structure of the UK electricity market and the bilateral electricity trading mechanism deeply. On this basis, some suggestions are put forward to further improve the construction of China’s electricity market.
Analysis on Operation Modes of Regional Integrated Energy System based on Interests Exchange Relationship
Authors: Chen ZHANG , Cuifen BAI , Yue ZHANG , Xinyang HAN , Yan ZHANG
Published: November 2019

Regional energy is an energy system solution designed to solve such issues as regional warm, heat, cooling and power supply and satisfy intra-regional energy demands. With the advancement of power marketization reform, newly added transaction subjects will gradually participate in such links as investment, construction and operation of integrated energy system. Considering the exchange relationship of energy, capital and service flows between various interests subjects of integrated energy system, the paper classifies the operation modes of regional integrated energy system according to the combination relationship between power generation, distribution and sales businesses, and also supplies case analysis according to actual demands.
Spatial-temporal Distribution Prediction of Charging Load for Electric Vehicle based on Dynamic Traffic Flow
Authors: SONG Yunong , LIN Shunjiang
Published: November 2019

On the basis of velocity-flow-density relationship and traffic-energy consumption relationship, this paper proposes a prediction method of the spatial and temporal characteristic of electric vehicle charging load using the traffic data. By analyzing the residential travel data, a probability model was built to generate trip chains of a day, which contain destination and start time. Then vehicle transfer model was used to simulate driving vehicles on the roads and SOC could be calculated by the road condition and temperature. Drivers would charge vehicles when SOC is below the charging threshold. Finally, by using the Monte Carlo method, charging load of a real traffic model was calculated according to charging demand from all electric vehicles at different time and location during the area.
The Reactive Power Compensation Planning for N-1 Line Outage Based on Line Fault Betweenness
Authors: Ye Bichao , Nie Jin , Chen Han
Published: November 2019

An inappropriate compensation capacity can cause oscillation or even collapse of the grid. This paper focus on the RPP problem considering single line outage in the grid. Firstly, the line fault betweenness (LFB) is proposed to identify the preoutage and post-outage impact on vulnerable lines. Then, considering the cost and power quality of the grid, a multi-objective optimization is adopted to analysis the result of compensation planning and solved by the multi-objective genetic algorithm and F1-scores. Finally, the IEEE-39 test system is employed to illustrate the important lines with LFB ranking and the decision of reactive power compensation planning. The compensation result reveals the improvement on power factor of generators and load voltage offset reduction.
Neural Network Model of Wind Farm Based on DFIGs
Authors: Guo Bingtao , Xie Baochang , Liang Zhan , Cai Xu
Published: November 2019

Due to the complexity of wind farms for power flow calculation in power system, it is difficult to accurately describe equivalent models in accordance with traditional methods such as weighted average parameters. However, the merit of neural network (NN) is able to mimic nonlinear and complicated function with multiple inputs and multiple outputs (MIMO). The back-propagation (BP) NN is adopted to substitute the wind farm based on doubly-fed induction generators (DFIG) in this paper. To do this, a simple BP model is established to be equivalent to single DFIG. The training data of the NN is obtained by simulation of actual DFIG, in which the wind speed, voltages of DFIGs, optimal power captured strategy are used as inputs and the active and reactive power are as outputs. Furthermore, a multilayer BP model is built and trained to mimic the wind farm based on DFIGs using simulation results of the actual 34 DFIGs, 102 MW electrical network with statistical wind speed and rotor-side voltage. The simulation results show that the BP NN can be used to model the wind farm, simplify the power flow calculation in the power system and be of high accuracy.
Research on Characteristics of Grounding Electrode of HVDC Transmission
Authors: Wang Bozhong , Peng Mai , Li Wenni , Li Peng , Jiang Yizhou , Xie Yaoxuan , Zou Yingxiang , Wang Qing
Published: November 2019

Abstract The grounding electrode is an important part of HVDC transmission system, especially in monopole operation. Based on the actual operation of the grounding electrode of Guanyin Pavilion in the ±500kV Goose-commutation station in Huizhou, Guangdong, this paper analyses in detail the specific influencing factors of the grounding electrode on the surrounding environment, underground metal pipelines and AC grid. Daily maintenance work considering current distribution, temperature, humidity and step voltage is also proposed to strengthen the understanding and attention of operation and maintenance personnel to the grounding electrode.
Research on Parallel Operation Characteristics and Current Sharing Method of High Power IGBT
Authors: Yong Tang , Bo Wang , Qiu Jie Lin
Published: November 2019

With the development of power electronics technology, the capacity of power conversion devices is getting larger and larger, and the current level requirements for high-power IGBT are also getting higher and higher. A single device often cannot meet the requirements, and multiple IGBT need to be used in parallel. When IGBT is connected in parallel, due to the differences in device parameters, external circuit parameters and heat dissipation conditions, the current distribution is easily unbalanced, resulting in device performance waste or even damage. Therefore, the current sharing problem is the core problem to be solved in parallel connection of IGBT. In order to solve the problems such as difficulty in analyzing a single factor for coupling of various influencing factors, difficult control of temperature and high cost of circuit, this paper adopts Saber software simulation method to analyze the influence of various internal and external factors on IGBT’s dynamic and static current sharing, thus obtaining the relationship between these factors and corresponding countermeasures, and obtaining an effective IGBT parallel current sharing scheme. Finally, the correctness and effectiveness of this scheme are verified by experiments.
A Power Transformer Fault Diagnosis Method Based on Hierarchical Classification and Ensemble Learning
Authors: Su L , Cui Y , Yu Z , Chen L , Xu P , Hou H , Sheng G
Published: November 2019

Since conventional machine learning methods often result in low diagnostic accuracy and non-negligible recognition difference among fault types with imbalanced class distribution among transformer fault types, a multi-level hierarchical power transformer fault diagnostic model is proposed based on hierarchical classification and ensemble learning, where classifiers are hierarchically constructed for level-by-level diagnosis according to the imbalance extent on each level. The Level I neural network classifier extracts 3 generalized feature labels of normal, discharge fault and thermal fault for feature fusion with original data input, to guide classification among 9 detailed operation status under DL/T 722-2014 standard. The Level II classifier adopts EasyEnsemble, generating balanced training subsets by undersampling majority classes and training sub-classifiers in parallel for parameter synthesis in ultimate classifier, to balance information between major fault types and minor ones. Experimental result shows that: compared to traditional methods, our proposed method improves the generalization ability on minority class faults and the overall accuracy by 7%.
Research on the Application Value of Wireless Mesh Network in Power Equipment of the UPIOT
Authors: Song S M , Yao W J
Published: November 2019

In this paper, an advanced wireless network called WMN was researched for the construction of UPIOT, especially from the perspective of power equipment. By introducing the fundamentals and analyzing the advantages of WMN, it proved that the WMN should have great application value in the communication system in Power Equipment of the UPIOT. By comparing ZigBee mesh and BLE mesh, it indicated that the WMN can be built by different technologies in relative application scenarios. By proposing a design of architecture with the application of WMN, it provided an innovative idea to construct the Power Equipment of the UPIOT and some theoretical supports for the subsequent research of the Ubiquitous Power Internet of Things.
Research on SaaS Layer Application Architecture for DCCP Considering Ubiquitous Internet of Things
Authors: Liu Hongjun , Guan Ti , Geng Yujie , Ma Qiang , Tian Dawei , Liu Yong , Lin Lin , Li Sheng
Published: November 2019

In 2019, State Grid Corporation of China officially proposed the overall planning of building SG-eIoT(State Grid-electric Internet of Things). DCCP(Dispatching and Control Cloud Platform) is an essential foundation and critical part of SG-eIoT, it aims at achieving cross-departmental resource sharing through resource virtualization, data standardization, and application orientation, so as to break a new way to improve operation level of power system, and operation efficiency of State Grid. At present, infrastructure layer and public service layer of DCCP have been formed, but with some inadequacies in application layer architecture. In consideration of practical operation of State Grid, this paper proposes an application architecture what is not only in line with operation specifications, but also convenient for unified management. This design helps to wipe off obstacles for data communication among different applications, and realize SG-eIoT. In addition, competition mechanism is introduced in application architecture to enhance practicability of applications.