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교과서와 교사용 지도서에 제시된 소리의 성질 단원의 파동개념에 대한 초등 교사들의 이해도, 확신도와 친숙도 분석
정재훈 ( Jeong Jaehun ),이지원 ( Lee Jiwon ),김중복 ( Kim Jung Bog ) 한국초등과학교육학회 2016 초등과학교육 Vol.35 No.4
The purpose of this study was to analyze elementary school teachers` understanding, certainty, and familiarity with 13 key concepts of wave physics that are presented in textbook and teacher`s guidebook. 123 elementary school teachers answered concept tests and questionnaires. In the results to these tests and questionnaires, teachers demonstrated a high level of understanding and high certainty in understanding with regard to the concepts of sound generation, effect of medium on wave, timbre, wavelength, and trough and crest of wave. For the topics of sound velocity, wave reflection and wave transmission, teachers demonstrated a high level of understanding but low certainty in understanding. With regard to sound propagation, teachers demonstrated a low level of understanding and an improperly high certainty in that low understanding. Teachers lacked knowledge, i.e., displayed a low level of understanding and low certainty in sound strength, sound frequency, constructive interference and destructive interference. In constructive and destructive interference, the teachers also displayed a low level of familiarity. We analyzed the differences in teacher`s understanding, certainty, and familiarity according to teacher demographics defined by the teacher`s gender, teaching experience with concepts of sound, career, curriculum track while in high school, and major in university. There were no significant differences in understanding, certainty, or familiarity as defined by gender, teaching experience, and career. However, these displays of knowledge were affected by the teacher`s curriculum track in high school and their major. These results suggest that the teacher`s understanding of, familiarity with, and certainty in wave physics concepts are more influenced by their learning experience than by their teaching experience. Therefore, we suggest additional learning opportunities for teachers (such as teacher training programs) in order to improve teacher knowledge and correct teacher misconceptions in wave physics.
사마천(司馬遷)이 그린 흉노(匈奴)의 ‘진상(眞相)’과 후대의 이해 ― 『사기(史記)』 「흉노열전(匈奴列傳)」 모두(冒頭)의 선조(先祖)와 유목(遊牧) 관련 기록의 재검토 ―
정재훈 ( Jeong Jaehun ) 중앙아시아학회 2020 中央아시아硏究 Vol.25 No.2
In the course of organizing and reviewing the previous understanding the fore record of Biography of Xiongnu(匈奴), Shiji (史記), it led to the question that some of the contents of the ancestor of Xiongnu and their nomadic lifestyle were intertwined. It has been pointed out and understood according to three previous explanations(三家註). According to existing understanding, Chun Wei(淳維), the ancestor of the Xiongnu, fled to the place of three tribes that had lived in the Northern area since the before the period of Yao-Shun(堯舜), and became the Xiongnu of the late period of the War(戰國時代). However, unlike the previous understanding that Chun Wei entered the North place and the tribes living in the Northern place were nomadic, the explanation of nomadic life style was linked to the explaining their ancestors. In this case, the first part will be the track record of ancestor Chun Wei, and the second part will be the accurate expression of Sima Qian on nomadic life style. As an extension of this understanding, the background of Sima Qian(司馬遷)'s accurate depiction of the nomadic expression was traced to later generations. Ban Gu(班固) wrote down Sima Qian’s expression as it was, but Fan Ye(范曄) quoted a book from the biography of Northern People(北狄傳), which emphasized the movement, contrary to Sima Qian's understanding. Since then, Fan Ye's expression has been stuck in cliché, as it continues to be quoted in biography of Northern People. During the Tang(唐) Dynasty, nomads were even described as being disparaging or wandering. This was unfortunately the result of the misunderstanding of Sima Qian's precise understanding of nomads in later generations. Moreover, this was further reinforced later by repeated references to nomads in other works. To explain the settlement process of prejudice against nomads projected in this later biography of Northern People and corrected the misunderstanding, I newly tried to read the records of the ancestor and the nomadic lifestyle in first part of the biography of Xiongnu. By organizing the contents as a whole, I restored the “Real Xiongnu” of Sima Qian had drawn, and was able to understand the nomadic lifestyle and the other side exactly. In the process, I identified the excellence of Sima Qian’s records, who accurately grasped the characteristics of the recording object and described it as if he had seen it with his own eyes. I also know that this material confirms again that it is crucial to restore history anew. A more in-depth review of other parts of the biography of Xiongnu will allow us to try a new approach to the Xiongnu history.
정재훈 ( Jeong Jaehun ) 중앙아시아학회 2021 中央아시아硏究 Vol.26 No.2
Sima Qian admitted that he could not accurately understand the development of the northern history over a thousand years, but arranged the development of the pre-history by “from Rong-di to Rong, Rong, Hu, and to Xiongnu”. This is a new approach to existing research based on a biased understanding of the “Northern people(Bei-di) = Nomadic people = Xiongnu”. Through this, it is possible to organize the records of Sima Qian's pre-history of Xiongnu empire, which accurately identifies the characteristics of individual existence and systematically organizes them according to the changes of the times. Although the historical trends of Northern people, which have been closely related to the China, are weak in specificity, it is possible to give a general understanding of the Xiongnu history who emerged later. This fully reviewed Sima Qian's compositions willingness to provide accurate information about the Xiongnu, just as Confucius tried to write exactly the book of Chunqiu(春秋). This is because it is important for Sima Qian to provide accurate information to prepare countermeasures against the Xiongnu empire, who were then the targets of a strong threat to China. He recorded the history of the Xiongnu with this problematic consciousness and objectively summarized the situation before the foundation of state in B.C. 209. This is not an explanation of the Xiongnu's orgin, but the objective information about the situation in the North before their appearance. Therefore, new research and compilation of records of the Xiongnu can confirm the objective record of Sima Qian. It will be an opportunity to study the possibility of a new approach in the history of Xiongnu.
보편적 기본소득 정책 효과의 정량분석: 노동시장 분석을 중심으로
鄭在勛 ( Jaehun Jeong ),沈明圭 ( Myungkyu Shim ) 한국국제경제학회 2021 국제경제연구 Vol.27 No.3
본 논문은 전 국민에게 월 30만 원의 기본소득을 도입할 경우 발생하는 거시경제적 효과를 노동이 분할가능하지 않은 이질적 동태확률 일반균형모형을 통해 정량적으로 분석한다. 모형에서 기본소득의 재원 마련을 위해 소득세와 소비세를 각각 고려할 때 소비세 인상방안이 사회 후생손실 및 거시경제에 대한 부정적인 효과를 감소시킨다는 측면에서 우월하다. 하지만 해당 정책 역시 월 30만 원의 기본소득 도입을 위해서 소비세율이 현행 10%에서 약 36%로 큰 폭으로 인상되어야 하며, 기준모형 하에서 균제상태의 고용률은 66.8%에서 62.1%로 하락시켜 총생산 및 소비대등후생(CEV)을 각각 11.1%, 7.2% 하락시킨다는 측면에서 사회 전반에 부정적인 면이 큰 것으로 나타난다. This paper analyzes with a heterogenous agent DSGE model the extent to which the introduction of universal basic income (UBI) affects the aggregate economy. We first show that distortions arise from consumption tax is less severe than those from income tax. However, even the consumption tax-financed UBI is socially undesirable as it significantly lowers employment rate, GDP, consumption, and social welfare. We further confirm the robustness of our findings to alternative model setup and parameter values.