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파력에너지 변환을 위한 직접구동터빈의 파고에 따른 성능 실험에 관한 연구
김창구(Chang-Goo Kim),최영도(Young-Do Choi),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
Newly developed direct drive hydro turbine (DDT) for wave energy converter is suggested in this study. The performance of the turbine model is investigated experimentally with the variation of the wave height in a 2-D wave tank. The results show that the performance of the turbine varies considerably by the wave height. The static pressure and flow rate at the turbine front nozzle as well as the rotational speed of the runner change remarkably by the wave height.
김창구(Kim, Chang-Goo),최영도(Choi, Young-Do),이영호(Lee, Young-Ho),Prasad, Deepak 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Recent developments such as concern over global warming, depletion of fossil fuels and increase in energy demands by the increasing world population has eventually lead to mass production of electricity using renewable sources. Apart from wind and solar, ocean holds tremendous amount of untapped energy in forms such as geothermal vents, tides and waves. The current study looks at generating power using waves and the focus is on the primary energy conversion (first stage conversion) of incoming waves for different models. Observation of flow characteristics and the velocity in the augmentation channel as well as the front guide nozzle are presented in the paper. A numerical wave tank was used to simulate the waves and after obtaining the desired wave properties; the augmentation channel plus the front guide nozzle and rear chamber were integrated to the numerical wave tank. The waves in the numerical wave tank were generated by a piston type wave maker which was located at the wave tank inlet. The inlet which was modeled as a plate wall moved sinusoidally with the general function, x=asinomegat The augmentation channel consisted of a front nozzle, rear nozzle and an internal fluid region representing the turbine housing. The analysis was performed using the commercial CFD code ANSYS-CFX.
김창구(Chang-Gu Kim),이찬구(Chan-Goo Yi) 한국기술혁신학회 2017 한국기술혁신학회 학술대회 발표논문집 Vol.2017 No.5
민군기술협력사업은 민과 군의 공동활용 기술개발 및 기술의 상호이전을 추진하는 사업으로, 민군기술의 융합을 바탕으로 과학기술을 효과적으로 획득하고 활용하기 위한 국가정책이다. 1998년 이후 현재까지 정부주도의 다양한 민군기술협력사업 진흥정책이 시행되었으나, 일관성 있는 범 부처자원의 추진체계 및 위원회와 참여기관간의 상호협력 부족으로 그 효과가 극대화되지 못하고 있어 민군기술협력사업의 효율적인 정책 추진 방안에 대한 연구가 필요하다. 본 연구에서는 정부의 기본계획에 대해 각 수립 시기별로 민군기술협력 거버넌스 변화에 따른 민군기술협력사업의 연구 성과와 민군 기술의 상호 영향성과 문제점을 확인하고, 이를 기반으로 거버넌스에 의한 민군기술협력 사업의 활성화 영향에 대해 분석하였다. 향후 민군기술협력의 시너지 개선을 위하여, 민군기술협력 사업의 정책 주체인 정부부처-위원회-전문가집단 관계구조의 발전방향에 대해 추가 연구할 예정이다.
L2 한국어 관계절의 이해와 산출: NPAH와 유생성 효과의 재검토
김창구 ( Chang Goo Kim ) 국제한국어교육학회 2013 한국어 교육 Vol.24 No.2
Although Keenan & Comrie’s NPAH (1977) hypothesis has been shown to predict the developmental order of relatives clauses (RCs) in SLA (subject RCs are easier than direct object RCs, both in production and comprehension), most studies have been based on L2 English and European languages. This study tests the prediction for L2 Korean, which differs in its language properties (cannonical word order, RCs’ position, cue strength etc.) from those languages. Study 1 analyzed RCs in spoken & written data from learners’ and native speakers’. The results of analysis revealed that SU RCs were produced easier than DO RCs in both data, in both group. However, there were also strong associations between SU and animate heads and between DO/OBL and inanimate heads. Study 2 identified these two factors(NPAH & animacy effect), including L1 transfer (English, Chinese, Japanese). The results of a listening comprehension test (involving RCs types, animacy types) revealed that Japanese & Chinese groups found DO RCs easier than SU RCs, but English group found SU RCs easier than DO RCs. Second, the animacy effect in processing RCs is evident in clear difference between sentence types (the number of animate nouns in a sentence). From these results, research suggested that analyse not only grammatical functions of RCs, but animacy, L1 properties (such as head direction, word order, and cue strength) to understand entire processing patterns of L2 Korean RCs, and suggested two hypotheses; H1) in the [-R] type sentences, SU RCs are easier than DO RCs to process, regardless of L1, but H2) in the case of [+R] type sentences, Chinese learners process DO RCs than SU RCs easier, but English learners process DO RCs than SU RCs easier.
KFL 교육과정을 위한 한국어교육·학습용 참조 어휘목록과 검색 시스템 개발
김창구(Kim, Chang-Goo) 언어과학회 2016 언어과학연구 Vol.0 No.78
The purpose of this study is to report on the process of developing a word list for teaching the Korean language (RWL) and constructing a searching system on Microsoft’s EXCEL. First, the existing lists of basic Korean words are analysed (i.e., reference materials, vocabulary selection procedure etc.). Based on the analysis, I constructed and analysed three million-scaled corpus, consisting of 4 sub-corpus (‘Sejong Spoken Corpus’, ‘Korean movies and TV dramas,’ ‘textbooks,’ and ‘TOPIK’), 9 existing word lists, and 2 general corpus. Based on these source corpus I made 4 separated lists and combined them on EXCEL. Following that, various information (ID, parts-of-speech, meanings, guide words, frequency, range between lists, proficiency levels, etc.) were attached to every word. Finally, the concluding case study showed that the RWL can make reliable vocabulary lists depending on the levels of the number of words.
한국어판 Graded Readers 을 이용한다독 수업의 효과에 관한 실증적 연구
김창구(Chang Goo Kim) 언어과학회 2013 언어과학연구 Vol.0 No.66
The purpose of this study is to examine the effects of extensive reading in KFL settings. For this, we prepared 13 Korean Graded Readers and carried out extensive reading program during 13 weeks in a Japanese university. After 13 weeks-extensive reading program, we compared the gains differences between ER group and control group. The result of reading speed task showed that the ER group`s reading rate became faster than that of control group, but as for C-test, there was no statistically significant difference between two group>. The quantitative am qualitative analyses of questionnaire about ER program and its effects suggested that ER program can affect students` attitude toward reading behavior positively, but it is appeared not enough to induce motivation on learning Korean.
구어 오류 처치에 대한 한국어교사와 학습자의 인식 조사
김창구(Kim Chang-Goo) 동북아시아문화학회 2011 동북아 문화연구 Vol.1 No.27
The purpose of this study was to investigate Korean language teachers’ and Chinese speaking students’ perception about the necessity, frequency, timing, type, delivering agent, and method of error treatment through questionnaires, and based on the findings, to suggest some potential suggestions to treat spoken errors in Korean language oral communication classes. A total of 151 students from two universities in Busan and 67 teachers from 7 universities in Busan and Seoul completed 24-item survey. The results revealed that there is the mismatch between teachers and students perception about the effectiveness of error spoken error treatment in Korean language classroom; (1) students preferred their spoken errors to be treated strongly, (2) preferred to receive error treatment more frequently than their teachers expected, and (3) the best time to treat spoken errors is after they speaks. In addition, (4) students expected to be treated their all kinds of errors, especially frequent errors. But (5) in terms of the delivering agent of error treatment, teachers and students both regarded teachers as the appropriate people to treat errors. And finally (6) students expected to treat their errors via explicit feedback and recast, but teachers expected to treat students’ errors via implicit feedback, elicitation and repetition. The overall findings indicate that Chinese speaking students have more positive and strong perception to error treatment than their teachers’.
파력에너지 변환을 위한 직접구동터빈의 파고에 따른 성능 실험에 관한 연구
김창구(Chang-Goo Kim),최영도(Young-Do Choi),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
Newly developed direct drive hydro turbine (DDT) for wave energy converter is suggested in this study. The performance of the turbine model is investigated experimentally with the variation of the wave height in a 2-D wave tank. The results show that the performance of the turbine varies considerably by the wave height. The static pressure and flow rate at the turbine front nozzle as well as the rotational speed of the runner change remarkably by the wave height.
파랑조건이 파력발전용 직접구동터빈의 파랑조건에 미치는 영향
김창구(Chang-Goo Kim),최영도(Young-Do Choi),황영호(Yeong-Ho Hwang),이영호(Young-Ho Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The purpose of present study is to investigate the effect of wave conditions on the performance and internal flow of a direct drive turbine (DDT) model for wave energy conversion experimentally. Regular waves by various wave conditions of wave height and wave period are applied to the turbine performance test. Test results show that rotational speed, differential pressure, inflow flow rate, maximum output power and best efficiency of the turbine model vary considerably by the wave conditions