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유병길,김효진 부산교육대학교 과학교육연구소 2001 科學敎育硏究 Vol.26 No.-
Energy, one of the most important themes in science education, is also one of the most difficult. Many students often confuse colloquial vocabulary and everyday ideas with scientific definitions and concepts. The present work examined the effects of the instruction on elementary school students' energy concept. Two groups of the 6-th graders were established. Students were tested before and after each instruction of energy unit. The experimental group's average value in post-test was higher than the comparative group's. The instruction to reconstruct energy unit in the viewpoint of energy transfer is more effective than traditional teaching.
유병길,소하연 부산교육대학교 과학교육연구소 2000 科學敎育硏究 Vol.25 No.-
Energy, one of the most important themes in science education, is also one of the most difficult. Many students often confuse colloquial vocabulary and everyday ideas wih scienctific definitions and concepts. The present work uses a questionnaire including picture to probe elementary student's conception concerning energy, and compare their prevalence in students of different grade groups. Analysis of the data shows that they relate energy with states concerning electricity and energy source. It is suggested that, concerning energy teaching, it is better to begin with electric energy transformation to other energy.
유병길 한국물리학회 2006 새물리 Vol.52 No.1
The hadron model is used to estimate the cross sections for the photoproduction process $\gamma N\to K \Theta^+$ in order to investigate the parity of the pentaquark $\Theta^+$. In model calculation, the parity of the $\Theta^+$ is assumed to be either positive or negative, and both the pseudoscalar(PS) scheme and pseudovector (PV) scheme are applied for kaon-nucleon-$\Theta^+$ ($KN\Theta$) coupling. The gauge invariance of the reaction amplitude with hadronic form factors is preserved based on the Ohta's prescription. The total cross-section of the positive parity $\Theta^+$ is found to show a tendency which is ten times quite larger than that of the negative parity $\Theta^+$. In particular, for the case of using a neutron target, the differential cross-section near threshold exhibits the production of an s-wave multipole for an positive parity $\Theta^+$ and p-wave multipole for a negative parity $\Theta^+$. Based on these different features, a way to distinguish the parity of the $\Theta^+$ from the photoproduction process is discussed. 펜타쿼크 세타입자의 패리티를 조사하기 위하여 강입자 모형으로 세타 광생성 반응 $\gamma N\to K \Theta^+$에 대한 단면적을 계산하였다. 모형 계산에서 세타입자의 패리티를 각각 양수와 음수일 때로 가정하고 캐온-핵자-세타 ($KN\Theta$) 강작용 결합에 대해서는 수도스칼라 (PS)와 수도벡터 (PV) 두 가지 형식을 모두 적용하였다. 강입자 형태인자를 포함하는 Born 진폭의 게이지 불변은 Ohta의 방식을 따라서 유지하였다. 패리티가 양수일 때 전 산란 단면적은 음수일 때 보다 10 배 이상 크게 주어 진다는 것을 알았다. 특히 반응이 중성자에서 일어날 경우에 문턱 에너지 근방에서 미분 산란 단면적은 패리티가 양수일 때 s-파 다중항으로, 그리고 음수일 때 p-파 다중항으로 각각 다른 각운동량 분포를 보여 주었다. 이러한 특징들로 부터 세타입자의 패리티가 광생성 반응에서 어떻게 구분될 수 있는지 논의하였다.
사이버네틱스와 급진적 구성주의에 입각한 학습모형 구안을 위한 예비 작업
유병길 대한지구과학교육학회 2010 대한지구과학교육학회지 Vol.3 No.3
This work describes a preliminary investigation to a learning model based on cybernetics and radical constructivism. To achieve this purpose, main ideas of cybernetics, i.e., negative feedback, difference, self-regulation, equilibrium, and purpose-directed behavior was analysed under radical constructivism. Powers' model, which consists of hierarchically arranged negative feedback systems, is introduced into this work. This was based on the claim that living organisms behave to control perceptions. By adding the notion of scheme from the view of radical constructivism, a learning procedure, which consists of six steps, was suggested in this work.
유병길,윤희정 부산교육대학교 과학교육연구소 2000 科學敎育硏究 Vol.25 No.-
Many students are willing not to change their concept of science. They have much difficulty in learning science. So, there are many researches that learning science frequently requires the process of conceptual change. In approaches that focus on conceptual change, cognitive conflict strategies play a key role. It underlies Piaget's genetic epistemology in which disequilibration demands an strategies between assimilation and accommodation until equilibrium is restored. Disequilibration is very important in learning science. This study is intended to interpret the conceptual change of heat in learning science.
SAPHIR와 LEPS의 하이퍼론 광생성 실험분석에서 본 공조입자의 기여
유병길 한국물리학회 2005 새물리 Vol.51 No.4
The SAPHIR cross sections and the LEPS beam polarization asymmetries for K+ and K+0photoproduction are analyzed in the isobar model. The role of the new N resonance D13(1895)claimed by KAON MAID is investigated in the SAPHIR data, and the consistency of both data sets with D13 is examined by using a simultaneous least-squares t. In explaining the LEPS data,the resonance structure optimized to the SAPHIR data shows a rapid increase in the t-channel contributions and in the ˜2. From the duality of the s and t-channels, the N resonance F15(1680) introduced to the K+ process and F15(2000) to the K+0 process are found to play the roles signifficantly optimizing the least square t. This indicates that the resonance structures considered in current models need to include the nucleon resonances of higher spin states for a consistent description of both data sets. $K^+\Lambda$와 $K^+\Sigma^{0}$ 광생성 반응에 대한 SAPHIR의 단면적측정과 LEPS의 편광 비대칭(beam polarization asymmetry) 측정결과를 isobar 모형을 사용하여 분석하였다. SAPHIR 실험을 분석할 때 KAON-MAID에서 주장하는 공명입자 $D_{13}(1895)$의 기여도를 조사해보고 이와 함께 두 실험 결과가 일관되게 기술될 수 있는지 살펴 보았다.이 모형으로 입사 광에너지 $E_{\gamma}=1.5$%부터 2.4 GeV 영역에서 $K^+\Lambda$에 대한 SAPHIR 실험결과에 최적화된 공조입자들로 LEPS 실험을 설명하려면 일반적으로 t-channel 교환입자의 기여만 아니라 최소 오차 $\chi^2$ 값도 급격히 증가한다. t-channel과 s-channel과의 duality 관점에서 $K^+ \Lambda$ 반응에 도입한 $F_{15}(1680)$와 $K^+\Sigma^0$에 도입한 $F_{15}(2000)$ 공명입자는 각 반응에서 불안정한 t-channel 기여도와 최소 오차 $\chi^2$ 값을 최적화시키는데 중요한 역활을 하며 두 실험을 일관되게 설명하기 위해서는 모형계산에서 스핀이 큰 핵자 공명입자가 더 고려되어야 한다는 것을 알 수 있었다.