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권수정 서울여자대학교 2010 인문논총 Vol.20 No.-
연결어미를 정확하게 사용 하는것은 외국인은 물론 모국어 화자에게도 쉬운 일이 아니다 한국어에는 무수히 많은 연결어미가 있고 그 의미 기능 또한 다양하여 연결어미를 정확하게 사용하지 않으면 말하고자 하는 내용이 제대로 전달 되지 않기 때문이다. 이런 이유 로 지금 까지 한국어 문법 교육에서 연결 어미 는 상당히 중요한 요소로 인식 되어 왔으나 한국어 교육 측면에서 연결 어미 에 대한 기존 연구 는 만족스러운 수준 이 아니다. 본 연구 에서는 이러한 문제 의식 을 바탕으로 한국어 문법 교수 항목 중 양보 관계 연결 어미 에 대해 논하려고 한다. 먼저 양보 문 을 조건문과 대조 문을 비교하여 양보의 개념을 명확히 하고 한국어 교육용 양보관계 연결어미를 선정하여 목록 화 하고자 한다. 그리고 양보관계 연결어미의 통사, 의미 ,화용적 특성을 밝힌 후 이 결과 를 활용하여 한국어 교육용 양보관계 연결어미의 위계화를 시도 할것이다. It is not easy for not only foreign speakers but also native speakers to use conjunctive endings correctly in Korean. That is because Korean language has so many conjunctive endings and the meanings of the conjunctive endings are varying. Therefore, if a conjunctive ending is not spoken correctly, the intended meaning will not be successfully conveyed. For this reason, conjunctive endings have played an important role in the Korean language teaching, but the study of conjunctive endings has not fully taken placed. This study focuses on teaching concessive-conjunctive endings. Firstly, this study clarifies the concept of concession, and selects concessive-conjunctive endings for Korean language teaching. Secondly, this study organizes the hierarchy of concessive-conjunctive endings for Korean language teaching after defining the syntactic, semantic, pragmatic traits of the concessive-conjunctive endings.
GSP를 이용한 기하교육의 학습효과 : 중학교 2학년을 중심으로 In the Center of the Second Grader in Middle School
정기수,정권수 순천대학교 1999 순천대학교 자연과학논문집 Vol.18 No.2
For the purpose of making up some problems of geometry education, I want to show many visual and graphic models of diagrams by introducing GSP, which is one of software in computer class, before introducing proof in the second grade of middle school and to see what kinds of learning effects there are by permitting students to do research by themselves. To do this, I made an experiment by dividing two group of students as a experimental and comparing classes, and the result is as follows. First, the computer using-class was more effective than the usual ones in increasing scholastic achievements. Second, there are no difference between the experimental and comparing class. And also both group students felt difficulty in proving. This may show that more sufficient and effective learning about diagrams is needed before introducing proof.
Gwon, Jin-Su,Kim, Chun-Sung,Kang, Dae-Wook,Park, Jung-Woo,Kim, Sungshin The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
Renewable energy is being spotlighted as the electric power generating source for the next generation. Due to an increase in renewable energy systems in the grid system, their impact on the grid has become non-negligible. Thus, many countries in the world, including Europe, present their own grid codes for grid power conversion devices. In order to experiment with these grid codes, grid fault test equipment is required. This paper proposes both equipment and a control method, which are constructed with a 7-level cascaded H-bridge converter, that are capable of generating various grid faults. In addition, the Pulse Width Modulation (PWM) method for multilevel converters is compared and analyzed. The proposed structure, the control method, and the PWM method are verified through simulation and experimental results.
Observer-Based FL-SMC Active Damping for Back-to-Back PWM Converter with LCL Grid Filter
Gwon, Jin-Su,Lee, Hansoo,Kim, Sungshin Korean Institute of Intelligent Systems 2015 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.15 No.3
This paper proposes an active damping control method for a grid-side converter that has an LCL grid filter in the back-to-back converter. To remove the resonant frequency components produced by the LCL filter, it is necessary to measure the grid current. To do this, sensors must be added. However, it is not necessary to add sensors because the grid current is estimated by designing a suboptimal observer. In order to remove the nonlinearity and to gain fast response of control, both feedback linearization and sliding mode control are applied. The proposed method is verified through a simulation.
Accidental electrocution in two cattle confined in stanchions
( Su Gwon Roh ),( Jongho Kim ),( Jae-cheong Cho ),( Eun-jin Choi ),( Byungjae So ),( Kyunghyun Lee ) 한국동물위생학회(구 한국가축위생학회) 2020 韓國家畜衛生學會誌 Vol.43 No.3
On a farm with 6 Korean beef cattle, an adult cow and a calf suddenly died while eating. At that time, hair was pressed upon the stanchion facilities where the adult cow was fed. Two dead cattle were submitted to the Animal and Plant Quarantine Agency for disease diagnosis. Grossly, the mouth of the adult cow was full of feed that had been eaten before death, and there was a foamy fluid in the calf’s trachea. Both hemorrhages were observed in the muscles, as well as in the internal organs such as the liver, lungs, and heart. Ruminal mucosa was easily peeled off. Histopathologically, both muscles and internal organs showed severe hemorrhages. In particular, affected muscles were shown segmental and band-like patterns of myonecrosis, disappeared some myocytes, burned hair follicles, and irregular surface of skin. Severe hemorrhages of muscles and internal organs were consistent with previous reports. Easily separated mucosa of rumen and muscle lesions were very characteristic. We determined electrocution according to the pathological findings, laboratory results, and traces of accidents. This report will help to understand of pathological lesions of electrocution. Furthermore, this case suggests that the electrical wires and devices must be installed and handled carefully during the construction of the cowsheds care.
Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC
Gwon, Jin-Su,Park, Jung-Woo,Kang, Dea-Wook,Kim, Sungshin The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.4
This paper proposes a design and control method for a high-voltage direction current modular multilevel converter (HVDC-MMC) considering the capacitor voltage ripple of the submodule (SM). The capacitor voltage ripple consists of the line frequency and double-line-frequency components. The double line- frequency component does not fluctuate according to the active power, whereas the line-frequency component is highly influenced by the grid-side voltage and current. If the grid voltage drops, a conventional converter increases the current to maintain the active power. A grid voltage drops, current increment, or both occur with a capacitor voltage ripple higher than the limit value. In order to reliably control an MMC within a limit value, the SM capacitor should be designed on the basis of the capacitor voltage ripple. In this paper, the capacitor voltage ripple according to the grid voltage and current are analyzed, and the proposed control method includes a current limitation method considering the capacitor voltage ripple. The proposed design and control method are verified through simulation using PSCAD/EMTDC.
Counteractions against Changes of Logistics Environment in Northeast Asia
Byeong-Gwon Roh,Hui-Su Kim,Chang-Gwon Yoo,Gi-Pyoung Kim 한국유통과학회 2015 유통과학연구 Vol.13 No.5
Purpose – This study investigated competitive counteractions necessary for continuous growth in a rapidly changing logistics environment in Northeast Asia. Research Design, Data, and Methodology – Using a time series analysis, the study first investigated Northeast Asian trade scale and volume by examining online and offline material from the Ministry of Ocean and Fisheries, Busan Port Authority, and other government agencies. A literature survey was done to investigate the state and prospect of the logistics environment in Northeast Asia including changes in freight volume at major ports in the three Northeast Asian countries. Result – The results of the study suggest using the Trans-Korean Railroad (TKR), as well as promoting the North Pole and South Pole routes, to compete against changes in trade volume and the logistics environment in Northeast Asia. A SWOT analysis was done to examine the effectiveness of these strategies. Conclusions – The findings indicate that the TKR impact, using the Busan Port connecting the Trans-China Railway (TCR), the Trans-Siberian (TSR), and the North Pole Route, may be uncertain in practice considering the uncertainty in international politics.