Achmad Samsudin

Primary Scheme of VMMSCC Text for Re-conceptualizing Pre-service Elementary School Teachers' Conceptions

Visual Multi-Media Supported Conceptual Change Text (VMMSCCText) has been developed to represent the neutral object concept turn into more real and meaningful learning. The primary design of VMMSCCText is a multimedia computer that allows users to explore the complete neutral object concept in terms of the present conceptual and practical. Pre-service elementary school teachers should be provided with the learning that might enhance the conceptions thought by re-conceptualizing concepts in the basic concept of science, specifically the concepts about static electricity. To collect and to analyze the data sincerely and systematically, researchers used a developing method of ADDIE which has comprehensive steps: analyzing, design, development, implementation, and evaluation. The ADDIE developing steps used to define systematically from the phase of analysis sequencer up until the evaluation sequencer. Based on data analysis, it can be determined that VMMSCCText could successfully increase understanding for re-conceptualizing about neutral object conceptions on pre-service elementary school teachers’. Keywords—VMMSCCText; remediation; misconception; neutral object; elementary school teachers’

Problem-Solving Laboratory-Based Course Development to Improve Mental Model and Mental-Modeling Ability

One of the factors that cause a low level of the mental model (MM) and mental-modeling ability (MMA) of students who are physics teacher candidates in one of the LPTK in Palu-Indonesia is the traditional course program. The students are unable to use their knowledge to solve the problems. Therefore, it is necessary to develop problem-solving experimentbased course program to improve physics teacher candidate’s mental model (MM) and mental-modeling ability (MMA). The development of this course program uses R & D (research and development) method. This developmental process produced course program manuals consist of problem-solving-based course model, LKM (students’ worksheet), PD (lecturer guide), and assessment which focuses on improving physics teacher candidate’s MM and MMA. The manuals have been verified in electronic and magnetic course material. Keywords—Mental model (MM), Mental-modeling ability (MMA), Course program, and problem-solving laboratory

Level conceptual change pre-service elementary teachers on electric current conceptions through visual multimedia supported conceptual change

Now a day, conceptual change is the most valuable issues in the science education perspective, especially in the elementary education. Researchers have already dialed with the aim of the research to increase level conceptual change process on the electric conceptions through Visual Multimedia Supported Conceptual Change Text (VMMSCCText). We have ever utilized research and development method namely 3D-1I stands for Define, Design, Development, and Implementation. The 27 pre-service elementary teachers were involved in the research. The battery function in circuit electric conception is the futuristic concept which should have been learned by the students. Moreover, the data which was collected reports that static about 0%, disorientation about 0%, reconstruction about 55.6%, and construction about 25.9%. It can be concluded that the implementation of VMMSCCText to pre-service elementary teachers are increased to level conceptual change categories.

Simulation and optimization performance of GaAs/GaAs0.5Sb0.5/GaSb mechanically stacked tandem solar cells

Different approaches have been made in order to reach higher solar cells efficiencies. Concepts for multilayer solar cells have been developed. This can be realised if multiple individual single junction solar cells with different suitably chosen band gaps are connected in series in multi-junction solar cells. In our work, we have simulated and optimized solar cells based on the system mechanically stacked using computer simulation and predict their maximum performance. The structures of solar cells are based on the single junction GaAs, GaAs0.5Sb0.5 and GaSb cells. We have simulated each cell individually and extracted their optimal parameters (layer thickness, carrier concentration, the recombination velocity, etc), also, we calculated the efficiency of each cells optimized by separation of the solar spectrum in bands where the cell is sensible for the absorption. The optimal values of conversion efficiency have obtained for the three individual solar cells and the GaAs/GaAs0.5Sb0.5/GaSb tandem solar cells, that are: η = 19,76% for GaAs solar cell, η = 8,42% for GaAs0,5Sb0,5 solar cell, η = 4, 84% for GaSb solar cell and η = 33,02% for GaAs/GaAs0.5Sb0.5/GaSb tandem solar cell.

The transformation of two-tier test into four-tier test on Newton’s laws concepts

This research is based on other forms of diagnostic tests in the format of two-tier test about the concept of Newton’s Laws that the development still not yet well. Therefore, must be done a research to transform two-tier test into the four-tier test that refers to Kaltakci criteria. To achieve the purpose, the researchers used the 4D model (Defining, Designing, Developing, and Disseminating) as a method of research. The participants are 25 students at one of the senior high schools in Bandung. The result is the development of two-tier test format intothe four-tier test formatabout Newton’s Laws concept. At the disseminating, there are obtained the category of students who scientific knowledge, misconceptions, and errors of the Newton’s Laws concepts. The research will be the reference or preliminary research to conduct further research.

Developing multiple-choices test items as tools for measuring the scientific-generic skills on solar system

The aim of research is developing multiple-choices test items as tools for measuring the scientific of generic skills on solar system. To achieve the aim that the researchers used the ADDIE model consisting Of: Analyzing, Design, Development, Implementation, dan Evaluation, all of this as a method research. While The scientific of generic skills limited research to five indicator including: (1) indirect observation, (2) awareness of the scale, (3) inference logic, (4) a causal relation, and (5) mathematical modeling. The participants are 32 students at one of junior high schools in Bandung. The result shown that multiple-choices that are constructed test items have been declared valid by the expert validator, and after the tests show that the matter of developing multiple-choices test items be able to measuring the scientific of generic skills on solar system.

Developing energy and momentum conceptual survey (EMCS) with four-tier diagnostic test items

Students’ conceptions of work and energy are important to support the learning process in the classroom. For that reason, a diagnostic test instrument is needed to diagnose students’ conception of work and energy. As a result, the researcher decided to develop Energy and Momentum Conceptual Survey (EMCS) instrument test into four-tier test diagnostic items. The purpose of this research is organized as the first step of four-tier test-formatted EMCS development as one of diagnostic test instruments on work and Energy. The research method used the 4D model (Defining, Designing, Developing and Disseminating). The instrument developed has been tested to 39 students in one of Senior High Schools. The resulting research showed that four-tier test-formatted EMCS is able to diagnose students’ conception level of work and energy concept. It can be concluded that the development of four-tier test-formatted EMCS is one of potential diagnostic test instruments that able to obtain the category of students who understa...

Promoting collaboration skills on reflection concept through multimedia-based integrated instruction

Multimedia-Based Integrated Instructions (MBI2) has been developed to promote the collaboration skills on reflection concepts turn into more real and meaningful learning. The initial design of MBI2 in the form of a multimedia computer that allows users to explore the concept of the overall reflectance of the light through the conceptual and practical aspects that have been developed. MBI2has been developed to promoteone of the skills that the 21st-century skills to students’junior high school that is collaboration skill in order to compete in the future life. The ability to collaborate is divided into five aspects, namely contributions, time management, problem-solving, working with others and research techniques. Research methods utiliseed in this study is an exploration and instructional development 4D model (define, design, develop and disseminate). Based on data analysis, it can be concluded that the development of integrated multimedia-based instruction (MBI2) on the concept of reflection through the 4D developing model was effectively to enhance collaboration skills of students’junior high school.Multimedia-Based Integrated Instructions (MBI2) has been developed to promote the collaboration skills on reflection concepts turn into more real and meaningful learning. The initial design of MBI2 in the form of a multimedia computer that allows users to explore the concept of the overall reflectance of the light through the conceptual and practical aspects that have been developed. MBI2has been developed to promoteone of the skills that the 21st-century skills to students’junior high school that is collaboration skill in order to compete in the future life. The ability to collaborate is divided into five aspects, namely contributions, time management, problem-solving, working with others and research techniques. Research methods utiliseed in this study is an exploration and instructional development 4D model (define, design, develop and disseminate). Based on data analysis, it can be concluded that the development of integrated multimedia-based instruction (MBI2) on the concept of reflection through the...

Analyzing educational university students’ conceptions through smartphone-based PDEODE*E tasks on magnetic field in several mediums

Conceptual understanding is one of the most important aspects in the study of Physics because of it useful to understand principles behind certain phenomenon which happened. An innovative method was needed to strengthen and enhance student’s conceptual understanding, especially regarding the abstract subject such as magnetic field. For this reason, worksheet and exploration sheet based on PDEODE*E (Predict, Discuss, Explain, Observe, Discuss, Explore, and Explain) that uses Gauss Meter application as the smartphone technology has been designed to answer the problem. The magnetic field strength in different mediums is the physics subject which covered in this research. The research was conducted with the aim to know how effective smartphone technology-based PDEODE*E could be implemented as a physics learning strategy. The result of this research shows that students could show improvements in conceptual understanding that shown by the conclusion that was constructed during the learning process. Based on thi...

Identifikasi Miskonsepsi dan Penyebab Miskonsepsi Siswa Menggunakan Four-Tier Diagnostic Test Pada Sub-Materi Fluida Dinamik: Azas Kontinuitas

In Physics learning, the misconception is often experienced by students, including on Dynamic Fluid materials namely Continuity. This study aims to identify misconceptions that occur in the subject matter of the Continuity and identify the concepts weakness as the cause of the misconception. The study was conducted on 37 students in one high school in Bandung with one shoot research method. The diagnosis of student misconceptions is made using a four-tier diagnostic test instrument which is the development of a three-tier test instrument by adding a confidence level to the third tier. The results of the diagnosis showed that students who experienced misconceptions of 28%, students who understand some 35%, students who understand the concept only 6%, students who do not understand the concept of 30% and students who cannot be coded 0%. Based on the results of the observation on the learning process and the analysis on the third and fourth tier answers, misconception that occurs is generally due to the students inappropriate logic that students assume that the fluid has a large speed has a large fluid pressure, and fluid has a small speed has a small fluid pressure.