npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
Qrcode
  • Research Paper 2024-06-28

    Gender Differences in Interest, Selection Patterns, and Perceived Difficulty of Physics I Subject among Students in the 2015 Revised Integrated Science Curriculum

    GyuTae Yoon, Munho Kwon, Sangwoo Ha et al.

    Abstract : In the 2015 revised curriculum, students have the autonomy to choose their desired subjects through a choice-based curriculum. However, there is a continuing trend among students to avoid physics, opting for subjects where they can achieve relatively higher grades without considering their future career paths. In this study, we surveyed the motivations and tendencies of students who took integrated science courses to select Physics I and analyzed the results. The results showed that students’ preferred science subjects in the second year are Biology I, Chemistry I, Earth Science I, and Physics I, in that order. Male students cited the allure of physics content, while female students emphasized the necessity for university entrance as the reason for their interest in Physics I. Both male and female students mentioned relevance to career paths and personal interest and aptitude as reasons for selecting Physics I. Additionally, students tended to find the physics component of integrated science more challenging than other areas. Based on these results, discussions were held on strategies to enable more students to choose Physics I.

    Show More  
  • Research Paper 2024-06-28

    Collision of Two Spinning Billiard Balls and the Role of Table

    Hyeong-Chan Kim

    Abstract : We study the collision dynamics of a spinning cue ball approaching a static object ball with equal mass on a plane, common in billiards. While typical collisions in billiards are nearly perfectly elastic, with a restitution coefficient close to 1 and low friction, we explore three deviations from ideal elastic collisions: The non-elastic nature, the friction effects between the balls during collision, the friction between the ball and the table. We describe the detailed collision outcomes, emphasizing the importance of considering frictions. We reveal that friction, both between the balls and with the table, significantly influences the post-collision motions, deviating from the expectations of a purely elastic collision. The insights gained contribute to a better understanding of ball dynamics, impacting strategies and gameplay in billiards.

    Show More  
  • Research Paper 2024-05-31

    Influence of Anharmonic Effects on Phonon Dispersion in Cubic Perovskites

    Kwanhong Park, Jaejin Hwang, Jaekwang Lee

    Abstract : Perovskites are known to exhibit a variety of phases, including tetragonal, orthorhombic, and cubic, depending on the temperature. However, in the cubic phase, which indeed exists at room temperature, imaginary frequencies appear in the phonon dispersion based on the harmonic approximation. That’s why we need to consider the anharmonic effect to accurately capture the phonon dispersion. In this work, self-consistent phonon theory was utilized to calculate the phonon dispersion, including anharmonic effects, for the cubic phases of SrTiO3, BaTiO3, RbCaF3, and CsSrF3. This study demonstrates that the phonon dispersion of the cubic phase, present at room temperature, and their temperature dependency can be accurately predicted by considering the anharmonic effect.

    Show More  
  • Research Paper 2024-05-31

    Analysis of Elementary School Students’ Experimental Performance Characteristics and Difficulties in the Inquiry Activities on ‘Temperature and Heat’ Chapter

    Jung Yun Shin, Sangwoo Park

    Abstract : This study analyzed the characteristics and difficulties of elementary school students’ experiment processes in inquiry activities related to heat transfer in the ’Temperature and Heat’ unit of the 5th grade elementary school curriculum. After conducting inquiry activities with 12 students from 4th to 6th grade, we collected and analyzed students’ experiment process videos, researcher observation notes, student activity sheets, and post-interview data. The results showed that students encountered difficulties in conducting experiments precisely and interpreting the results to understand the concepts. Additionally, in the experiment on heat transfer in solids, students experienced experimental errors despite the experiment not being particularly difficult or time-constrained, and some students did not fully understand the concept of heat transfer in solids. Based on the research findings, we discussed solutions for addressing difficulties in setting up and operating experimental apparatus, the need for detailed description of experimental procedures for enhancing experimental skills.

    Show More  
  • Research Paper 2024-04-30

    Gravitational Deflection of Light: A Heuristic Derivation at the Undergraduate Level

    Hongbin Kim, Dong-han Yeom, Jong Hyun Kim

    Abstract : In this paper, we present a new heuristic derivation of the gravitational deflection of light around the Sun at the undergraduate level. Instead of solving the geodesic equation directly, we compute the correct deflection angle by focusing on the acceleration term of null geodesics. Using this heuristic deviation, we expect that undergraduate students who have not learned general relativity will be able to experience this computation, which is one of the most remarkable evidences of general relativity.

    Show More  

Current Issue

    June 2024 | Vol. 74 No. 6
  • Research Paper 2024-06-28

    Measurements of Stokes Parameter with Various Wavelengths of Cholesteric Liquid Crystals

    Gun Yeup Kim, Chong Hoon Kwak

    Abstract : We fabricated RH-CLC (right-handed Cholesteric Liquid Crystal) cells which are composed of various concentration of dextrorotatory (R1011) chiral dopants and nematic liquid crystal (6CHBT). We measured Stokes parameter of the fabricated CLC cells using appropriated different wavelengths from 400 nm to 650 nm region of laser with optical components such as polarizer and phase retarder. By adopting the coupled wave theory based on periodic dielectric permittivity, we present the closed form of analytic expression for wavelength dependence of Stokes parameters and compare with the formulae with experimental data, showing excellent agreements.

    Show More  
  • Research Paper 2024-06-28

    A Simple Optical Method for the Precise Determination of Helical Pitch of Cholesteric Liquid Crystal

    Gun Yeup Kim, Chong Hoon Kwak

    Abstract : We fabricated cholesteric liquid crystal (CLC) cells with doping several chiral concentrations in host nematic liquid crystal and measured transmittance spectra for various incident angles. It is found that as increasing incidence angle θair, the central Bragg wavelength λBair) gradually shifted toward shorter wavelength, while the corresponding bandwidth Δλ of the transmittance is broaden, showing good agreement with the theoretical predictions. We estimate the pitches of the fabricated CLC cells from λBair) in Bragg reflection or stopband region of transmittance spectra. We also compared the estimated pitches from central Bragg wavelength by theoretical expression for transmittance spectra at monochromic wavelength and showed good agreement.

    Show More  
  • Research Paper 2024-06-28

    Room Temperature Elasticity of Mixed Halide Perovskite Single Crystals Studied by Brillouin Spectroscopy

    Furqanul Hassan Naqvi, Syed Bilal Junaid, Jae Hyeon Ko

    Abstract : The mechanical properties of halide perovskites play an important role in the design and application of these materials in photovoltaic devices. The data of two elastic constants, C11 and C44, of 14 halide perovskites with respect to lattice constant and the density have been collected and investigated. The C11 showed a decreasing trend with increasing lattice constant, regardless of the type and composition of cations and anions in the perovskites. This indicated that smaller lattice constants are associated with shorter bond lengths on average and thus steeper interatomic potentials. The shear elastic constant C44 showed low values below 4 GPa, with the exception of a few compositions. In particular, the FA-included perovskites had extremely low C44 below 3 GPa. The low shear stiffness seems to be a common feature of halide perovskites, which may be attributed to the pliable octahedral tilting/rotation of the corner-sharing octahedra.

    Show More  
  • Research Paper 2024-06-28

    Gender Differences in Interest, Selection Patterns, and Perceived Difficulty of Physics I Subject among Students in the 2015 Revised Integrated Science Curriculum

    GyuTae Yoon, Munho Kwon, Sangwoo Ha et al.

    Abstract : In the 2015 revised curriculum, students have the autonomy to choose their desired subjects through a choice-based curriculum. However, there is a continuing trend among students to avoid physics, opting for subjects where they can achieve relatively higher grades without considering their future career paths. In this study, we surveyed the motivations and tendencies of students who took integrated science courses to select Physics I and analyzed the results. The results showed that students’ preferred science subjects in the second year are Biology I, Chemistry I, Earth Science I, and Physics I, in that order. Male students cited the allure of physics content, while female students emphasized the necessity for university entrance as the reason for their interest in Physics I. Both male and female students mentioned relevance to career paths and personal interest and aptitude as reasons for selecting Physics I. Additionally, students tended to find the physics component of integrated science more challenging than other areas. Based on these results, discussions were held on strategies to enable more students to choose Physics I.

    Show More  
  • Research Paper 2024-06-28

    Analysis of the Content System of `Electricity and Magnetism' in 2015 Revised Curriculum PhysicsⅠ Textbooks : Comparison with `Electrodynamics' in 『The Evolution of Physics』

    Gyucheol Sim, Hongbin Kim, Gyoungho Lee

    Abstract : In this study, drawing on previous research - analyzing Einstein and Infeld’s 『The Evolution of Physics』(hereafter referred to as EoP), which is regarded as effectively capturing the historical evolution of physics and the context of exploration in physics - we examined the 2015 revised national curriculum’s Physics I textbook, focusing specifically on Electricity and Magnetism. The research findings are as follows. First, building upon the EoP analysis, an analytical criteria for examining the textbook based on the narrative of ‘a change in perspective’ were developed. Second, through these criteria, the analysis revealed that the 2015 revised Physics I textbook lacked the perspective necessary for interpreting observed natural phenomena. This deficiency resulted in a failure to illustrate the context of exploration in physics. There were issues with hindering meaningful understanding by presenting the keywords in a simple listing format without adequate contextualization. Furthermore, inadequate treatment of the concept of ‘field’ resulted in a lack of coherence among content elements. The conclusion to be drawn here is that future textbook development should emphasize the ‘physics perspective on observing nature’ and a thorough treatment of the concept of ‘field’.

    Show More  
  • Research Paper 2024-06-28

    Exploration of Types of Middle School Students' Scientific Explanations of Thermal Phenomena

    Insun Lee, Hye-Gyoung Yoon, Jongwon Park

    Abstract : One of the main goals of science education is to help students construct scientific explanations. For this, it is important to investigate the characteristics of students’ explanations. This study analyzed the types and characteristics of scientific explanations written by 100 middle school students for two tasks: what happens when a cup of water is placed on an ice pack (thermal equilibrium) and what happens at the joint of a bridge when the temperature is high (thermal expansion). When a student’s explanation includes ‘cause’ and ‘result’, it was classified into scientific explanations. Scientific explanations were subdivided into four types depending on whether ‘theory’ and ‘condition’ were included. The proportion of scientific explanations in the two tasks was not high, and there were fewer scientific explanations in the case of thermal expansion than in thermal equilibrium. In addition, some misconceptions were found in the students’ explanations. Based on the results, teaching strategies were proposed to strengthen the students’ ability to construct scientific explanations.

    Show More  
  • Research Paper 2024-06-28

    A Junior Faculty's Self-study on the Practice and Reflection of Lectures on Introduction to Physics Education

    Youngrae Ji, Jaehyeok Choi, Yong Wook Cheong et al.

    Abstract : This study is a self-study about adjusting the position of a junior faculty majoring in physical education as a teacher educator. While teaching Introduction to Physics Education, I looked back on my practice and the practice of students, shared it with critical colleagues, and sought my practice and direction overall. The main research results are as follows. First, by re-examining my instructional practice process and my thinking, I discovered dissatisfaction that I did not usually recognize and revealed that dissatisfaction to others. Second, through reflection with critical colleagues, I learned things that I did not consider in the context of teacher education, and I could consider the starting point of practice from various angles. Third, by sharing teaching and learning methods with what is taught in Introduction to Physics Education, I learned that my intentions and goals as a teacher educator have yet to be established and that finding them is my task.

    Show More  
  • Research Paper 2024-06-28

    Analysis of Pre-service Elementary Teachers' Science Lesson Plans Using AR Content: Focusing on the Properties of Light

    Hyun-Jung Cha, Seok-Hyun Ga, Hye-Gyoung Yoon

    Abstract : This study explored how pre-service elementary teachers use AR content in science classes on a specific topic. 16 science lesson plans on ‘the property of light’ were analyzed. The analysis process of the lesson plans is as follows. First, the lesson plans were classified into detailed activities and each activity was divided into activities using technology and activities not using technology. Then, the level of cognitive engagement of activities was analyzed based on the ICAP framework(Chi & Wylie, 2014) and the types of activities using technology were inductively derived. The analysis results are as follows. First, the level of cognitive engagement in 19 activities using technology was mostly active, and only a small number of constructive engagement was found. Passive and interactive engagement did not appear. Second, the types of activities using technology were largely divided into ‘exploration type’ and ‘game-play type’. Cases corresponding to each category were presented and educational implications were discussed.

    Show More  
  • Research Paper 2024-06-28

    Statistical Analysis on Scale and Regional Distribution of Undergraduate Physics Programs in Korean Universities

    Gahyoun Gim, Sang Hoon Lee

    Abstract : We report on the temporal changes in undergraduate-level physics programs at Korean universities from 1915 to 2023 by analyzing data on physics-related departments and their students using basic statistics and the scaling theory of statistical physics. Our analysis reveals that the number of departments peaked around the turn of the 21st century, and it has been steadily decreasing ever since, with particularly severe declines in private universities located outside the capital region. Besides the change in the overall numbers, we also show the change in the self-identity of physics-related departments reflected in department names, which reveals a recent trend of emphasizing more application-side such as semiconductors and electronics. As a sophisticated measure to quantify regional imbalances relative to the population eligible for higher education, we present scaling exponents from the scaling theory, which shows a shift from sublinear to linear for departments and a shift from linear to superlinear for students. The result indicates the exacerbation of the regional imbalance of university-level physics education in Korea.

    Show More  
  • Research Paper 2024-06-28

    Collision of Two Spinning Billiard Balls and the Role of Table

    Hyeong-Chan Kim

    Abstract : We study the collision dynamics of a spinning cue ball approaching a static object ball with equal mass on a plane, common in billiards. While typical collisions in billiards are nearly perfectly elastic, with a restitution coefficient close to 1 and low friction, we explore three deviations from ideal elastic collisions: The non-elastic nature, the friction effects between the balls during collision, the friction between the ball and the table. We describe the detailed collision outcomes, emphasizing the importance of considering frictions. We reveal that friction, both between the balls and with the table, significantly influences the post-collision motions, deviating from the expectations of a purely elastic collision. The insights gained contribute to a better understanding of ball dynamics, impacting strategies and gameplay in billiards.

    Show More  

All Newest Articles

Current Issue

June 2024
Vol.74 No.6

pISSN 0374-4914
eISSN 2289-0041

submit an article

Most Read

pISSN 0374-4914
eISSN 2289-0041