Conical shell의 振動特性에 關한 硏究

김주식 서울大學校 大學院 1983 국내석사

CNG 엔진 연료분사 시스템을 위한 압력 조절기의 압력-유량 특성연구.

김주식 서울과학기술대학교 2016 국내석사

Recently, regulations for automobile exhaust gas have been strengthened, and reducing exhaust gas are urgently needed. Natural gas is the most noteworthy alternative fuel in the transport section. Natural gas has a relatively high calorific value and high octane number when it is used as an automobile fuel. It is also a very economical fuel because of low production cost. Furthermore, since methane is the main component, it emits less carbon dioxide and less sulfur oxides. However, commercially modified CNG vehicles have little effect on CO2 emission reduction. These vehicles have low fuel efficiency and acceleration performance due to the lack of control precision of fuel injection systems. Thus it is required to optimize the engine fuel injection system. The pressure in the fuel rail must be taken into account in order to control the precise fuel quantity of the gas fuel and to ensure the proper injection in the SI engine. However, the pressure regulator causes a problem that the output pressure is lower than the setting pressure under a certain condition. As a result, the pressure of the fuel rail decreases and the amount of fuel injection decreases. In this study, Characteristics of pressure and flow rate in a pressure regulator for the CNG engine fuel injection system have been investigated experimentally. Experiments were conducted using a compressed air instead of CNG fuel. Pressure sensors were installed in front and rear of the regulator to measure the pressure variation according to the stagnation pressure, the regulator setting pressure and the flow rate. The change of maximum flow rate was observed according to the stagnation pressure and the regulator setting pressure. And then, the characteristics of the minor loss coefficient of the regulator were analyzed. The results of this study are as follows. The higher is the set pressure of the pressure regulator, the greater maximum flow rate that can be injected. The increase of the maximum flow rate tends to be reduced with the setting pressure. The inlet pressure of the pressure regulator decreases sharply and the outlet pressure is slightly lower than the set pressure as the flow rate increases. The minor loss coefficient is inversely proportional to the square of the flow rate. By comparing the correlation curve of the minor loss coefficient for the constant stagnation pressure, it is known that the variation of the minor loss coefficient converges to one curve for a lager stagnation pressure or for a lower setting pressure of the pressure regulator. Therefore, the pressure difference between the stagnation pressure and the setting pressure should be maintained more than a certain pressure. 최근 자동차 배기가스 규제가 강화되면서 배기가스 저감을 위한 대책 마련이 시급한 상황이다. 현재 수송 분야에서 대체연료로 주목 받고 있는 연료가 천연가스이다. 천연가스는 비교적 발열량이 크고 자동차 연료로 사용할 때 옥탄가가 높으며 생산원가가 저렴하여 매우 경제적인 연료이다. 또한 메탄이 주성분이므로 이산화탄소의 배출량이 적고 동시에 황산화물 등의 배출이 거의 없어 청정연료로 현재 매우 주목을 받고 있다. 하지만 현재 사용되고 있는 개조 CNG 차량은 이산화탄소 배출량 감소 효과가 미비하고 연비와 가속성능이 낮다. 이러한 현상은 엔진 연료 분사시스템의 제어 정밀도가 낮아서 발생하므로 기관제어의 기본이 되는 연료 분사 시스템을 최적화하여 보완할 수 있다. SI 기관에서 기체 연료의 정밀한 연료량 제어와 적정 분사유량 확보를 위해서는 연료레일의 압력을 고려해야한다. 그러나 압력 레귤레이터에 의해 특정조건에서의 출력 압력이 설정압력보다 떨어지는 문제점이 발생하게 되는데 이에 따라 연료레일의 압력이 감소하여 연료 분사량이 감소하게 된다. 본 연구에서는 CNG 엔진에서 사용되는 압력 레귤레이터에 대한 실험을 통해 CNG 연료 분사 시스템의 압력 및 유량 변동 특성을 확인하고 이를 최적화 하는 방안을 마련하고자 하였다. CNG 연료 대신 압축공기를 이용하여 실험하였고 레귤레이터 전단과 후단에 압력센서를 연결하여 정체 압력과 레귤레이터 설정 압력, 유량변화에 따른 압력변화를 측정하였다. 정체 압력과 레귤레이터 설정 압력에 따른 최대 유량 변화를 실험적으로 측정 분석하고 유량을 변화시키면서 레귤레이터 입구와 출구 압력의 변화를 관찰하여 부차적 손실 계수에 대한 특성을 파악하였다. 본 연구의 결과 다음과 같은 사실을 도출하였다. 압력 레귤레이터의 설정압력이 높아질수록 분사할 수 있는 최대유량이 증가하며 정체압력에 따른 변화는 미비하였다. 최대유량의 증가율은 설정압력이 커질수록 감소하는 경향을 보였다. 또한 각각의 실험에서 유량이 증가함에 따라 압력 레귤레이터의 입구 압력이 급격히 감소하고 출구 압력은 설정압력보다 약간 감소하였다. 실험을 통해 수집한 데이터를 종합하여 부차적 손실계수를 분석하였다. 유량이 증가함에 따라 부차적 손실계수가 유량의 제곱에 반비례하는 것을 확인하였다. 정체압력이 일정할 때의 부차적 손실계수의 상관곡선을 비교한 결과 정체압력이 높거나 압력 레귤레이터의 설정압력이 낮을 경우 부차적 손실계수의 변화가 하나의 곡선으로 정확하게 수렴하였다. 따라서 정체압력과 설정 압력 사이에 일정 압력 이상의 압력차를 유지해야 함을 알 수 있다.

通貨先物의 決定要因에 관한 硏究 : 원/달러 通貨先物을 중심으로

김주식 延世大學校 經營大學院 2000 국내석사

A tremendous exchange rate fluctuations have been witnessed since the alteration of exchange rate system from fixed exchange rate to floating exchange rate system in 1997. Particularly, our financial industry have been facing great risks of exchange rate fluctuations due to the foreign exchange crisis as the opening of domestic capital market. The purpose of this dissertation is to discover the relation of currency futures and spot exchange rates, especially in the case of Korean Futures Exchange. Thus, an empirical analysis is used to figure out the convergency of won/dollar futures exchange rates to spot exchange rates, that is to say whether the estimated coefficient of spot exchange rates is one or not, by setting the regression equation LF912 = α+βLSPOT+γDINT+ε where LF912 is the logs of currency future expired Dec. 1999, LSPOT is the logs of spot exchange rate, DINT is interest rate difference between domestic and foreign countries, ε is error term, a is constant, and β, γ are coefficients. And this paper utilized as the empirical data future and spot exchange rates of U.S. dollar currency futures which have been traded in the KOFEX(Korean Futures Exchange) from April 23. to October 29. in 1999. In this study, there were used two currency futures in total which are the Dec. in 1999 and the Mar. in 2000, and corporate bond interest rates at delivery 3 years and US LIBOR base rates in 3 month. The empirical results are as follows : First, the unit root test finds the fact that the log-levels of each future and spot exchange rates, and interest rate difference are non-stationary, implying that each series are not identically independently distributed, but their first difference are stationary and integrated of order one. Second, Johansen cointegration test rejected the null hypothesis of non-cointegration among LF912, LSPOT and DINT at the 5 percent level of significance, and resulted in existence of a cointegration equation in the series of LF912, LSPOT, and DINT. Third, it appeared that Granger causality run one-way from LF003 to LF912 and especially, LF912 and LF003 variables was significantly explained by LSPOT variable. In addition, there was one- way causal relation from LF003 and LSPOT to DINT at the 10 percent level of significance. Fourth, in the vector error correction model D(LF912) model appeared to be explained significantly from negative error correction terms of LF912, D(LSPOT(-1)) and DINT variables. In conclusion, futures converges to spot exchange rates so the forwardness of futures to spot variables is found in some degree.

스토리텔링을 활용한 교수-학습 방법 연구 : 국어 교육의 기능 영역 통합을 중심으로

김주식 동국대학교 2012 국내석사

This study is aimed to construct an area integrated education by Teaching-Learning Method which utilizes storytelling. Storytelling has the advantage that makes learners actively participate in learning by motivating them and arousing their interest. Area integrated education is able to create the situation and context of listening-speaking-reading-writing which are most similar to language learners would use in real life. It is necessary education in order to improve learners’ language skills as it has practicality to be helpful in real life use of language. This study has the purpose as follows. First, To improve learners’ practical language skills. Second, It could improve communication skill with the utilization Teaching-Learning Method of storytelling. Third, To encourage learner’s active participation by arousing their interest and motivating them. Teaching-Learning Method is constructed for learners to easily understand learning contents based on their experience. In this process, learners repeat listening-speaking-reading-writing and they are able to learn a process which is similar to a real-life communication with class members. Through this process this study shows that improved language skills achieved in the class leads to increased ability to use language in real life.

補文의 類型論的 硏究

김주식 慶北大學校 敎育大學院 1980 국내석사

The purpose and the aim of this thesis are to investigate linguistic phenomena of complementation, analyzing cross-language data in the theoretical framework of language typology. I. The location of complementizer: The complementation type is different from language to language, and the location of complementizer is prepositional in English, Lango, Russian (SVO) and is postpositional or prepositional in Yaqui (SVO) and is postpositional in Kanuri, Korean (SOV). II. In the semantic analysis of complementation: 1) The style and meaning of complementation are mainly controlled by the features of verb. In Bulgarian, the complementizer ce is limited in indicative and da in subjunctive. In Korean, factive complementizer selects factive verb, and nonfactive complentizer selects nonfactive verb. 2) The kinds of CTP are classified: a) Utterance predicates b) Predicates of propositional attitude c) Pretence predicates d) Commentative predicates e) KAK predicates f) Fearing predicates g) Desiderative predicates h) Causative predicates III. In syntactic consideration of complementation: 1) In equi-deletion, when the matrix subject and object are coreferential with those of complementation respectively, deletions are obligatory. Then the matrix subject and the matrix object are coreferential with the complementation subject in Korean, deletions are optional. 2) There are four kinds of raising: SU→0, SU→SU, 0→SU, and 0→0. I can renew F. R. Eckman's list: in Irish, 0→0 raising can be possible, in Korean, S→0 raising possible and Lango S→0 impossible. 3) French has both clause union and simple clause reduction. 4) In distribution of complementation, 'poss-ing' is possible in interrogative and descriptive construction; and sentence type complementation is possible in descriptive construction. 5) Negative raising represents different meanings according to their feature of CTP.

1.5톤용 산업용 리프트의 최적설계를 위한 연구

김주식 선문대학교 산업기술대학원 2004 국내석사

고층 아파트, 사무용 건물, 교량, 철탑 등 각종 건축 및 건설현장에서 다양한 종류의 건축자재 이송을 위한 물류 장치로 산업용 리프트가 널리 사용되고 있다. 최근 건설현장에서의 인력 수급상의 어려움, 고임금 및 공기 단축 등의 이유로 각종 건축자재의 이송소요시간 단축 및 이송 효율화가 요구되고 있다. 따라서 현재 대부분 1톤 용량으로 사용되고 있는 산업용 리프트의 1.5톤 용량으로 증가시키기 위한 신제품 개발이 진행되고 있다. 본 연구에서는 아파트 및 주상복합 아파트 등의 건축현장에 널리 사용되고 있는 산업용 리프트 설계과정 및 계산방법을 체계화하고, 이를 최적화할 수 있는 설계용 소프트웨어를 개발함으로서 새로운 1.5톤용 산업용 리프트의 개발에 적용하고자 한다. 본 연구에서 수행되는 주요 내용은 다음과 같다. 1) 산업용 리프트의 설계과정 체계화 -산업용 리프트 설계과정 분석 -설계자동화를 위한 설계과정 체계화 (IDEFФ 모델) 2) 산업용 리프트 설계 지원을 위한 소프트웨어 설계 -산업용 리프트 설계지원 소프트웨어 구조 -3차원 CAD 시스템 기반의 API 응용 프로그램 설계 -설계용 계산과정의 Visual Basic 프로그램 설계 3) 산업용 리프트 설계 계산용 프로그램 개발 -설계지원 소프트웨어의 GUI 구현 -산업용 리프트의 부품 설계용 계산식 프로그래밍 4) 설계된 산업용 리프트의 3D 형상모델링을 위한 API 개발 -산업용 리프트 구성부품 및 조립품의 자동형상모델링용 API 프로그래밍 -설계형상의 도면화 5) 설계 검증을 위한 기구동작 및 유한요소해석 API 개발 -산업용 리프트 조립품의 기구동작 시뮬레이션용 API 프로그래밍 -산업용 리프트 조립품의 부하능력 시뮬레이션용 API 프로그래밍 6) 설계지원 소프트웨어의 1.5톤 산업용 리프트 설계 적용 -1.5톤 용량의 산업용 리프트 부품 및 조립설계를 위한 개발 소프트웨어 적용 The industrial lift is widely used to transport the several types of materials in construction work. Recently, construction vendors want to reduce the lead time by increasing the efficiency of transportation such as the larger capacity per operation and the faster moving. Therefore, the industrial lift with 1 ton load capacity will be upgraded to the lift with the more load capacity and the faster velocity. Proposed in the thesis is a formalized process for the optimal design of the industrial lift and a computer-aided design software for the several types of calculation at design processes and solid model generation for computer-aided engineering by Visual Basic and SolidWorks/COSMOS API programming. The implemented design software also is applied for the design of a new lift with 1.5 ton capacity. The main contents of this thesis are the follows: 1) Design process model for the industrial lift -Analysis for the current design process of the industrial lift -Design process model for the calculation and design verification (IDEFФ) 2) Design of computer-aided design software for the industrial lift design -Structure of the computer-aided design software -API application based on the commercial 3D CAD software -Design of computer-aided design software for the industrial lift based on Visual Basic and SolidWorks/COSMOS API 3) Implementation of a computer-aided design program for the required calculation at design process -Implementation GUI for designer interface -Implementation of the calculation module for the several types of calculation at the lift design process 4) Implementation of SolidWorks API program for the solid modeling of the designed industrial lift. -API programming for part and assembly model generation -API programming for drawing model generation 5) Implementation of COSMOS Motion and Works API programming for design verification -API programming for the kinematic simulation -API programming for the load analysis 6) Application for the design of a new lift with 1.5 ton capacity

초등학교 음악 교과서에 실린 악기 유형 및 학생의 선호도 분석

김주식 경남대학교 교육대학원 2011 국내석사

본 연구에서는 초등학교 3·4·5·6학년 교과서에 나오는 악기를 조사하고 악기별 사용빈도와 악기의 종류에 따른 특징들이 어떠한가를 살펴보고 악기들이 교과서에서 어떻게 지도되고 있으며 학년에 따른 지도내용의 연계성은 어떠한지 알아보았다. 그리고 교과서에서 중요하게 다뤄지는 악기가 학생의 인지 및 선호와 어떤 관련을 가지고 있는지 살펴보고 이를 바탕으로 기악지도에서 쓰일 악기에 대한 선택에 활용될 정보를 제공하고자 하였다. 그 결과는 다음과 같다. 첫째, 교과서에서 활용되고 있는 악기는 41종이었다. 타악기 또는 리듬악기를 제외하고는 악기의 구성이 단조로웠고 현악기는 기악활동에 사용되지 않고 있었다. 3·4학년은 타악기 또는 리듬악기 중심으로 구성이 되어있고 5·6학년으로 올라갈수록 관악기, 현악기 또는 가락악기의 비중이 높아졌다. 악기의 숫자에서는 국악기와 서양악기 간에 균형을 이루고 있었다. 그러나 타악기·관악기·현악기로 나뉠 경우 타악기의 악기 숫자가 많았다. 활용빈도에서는 국악기와 서양악기는 어느정도 균형을 맞추고 있었다. 악기의 종류를 타악기·관악기·현악기로 구분할 경우 타악기의 비중이 가장 높고 현악기가 가장 낮았다. 둘째, 교과서에서 사용되는 주요 악기는 학년별로 연계성을 가지고 지도되었다. 기악활동에서는 타악기와 일부 관악기가 주로 사용되고 감상활동에서는 관악기와 현악기의 음색을 듣는 활동이 주를 이루고 있었다. 타악기 및 리듬악기의 주요 악기는 3학년에서 연주방법이 다뤄지고 4학년에서는 연주활동이 주를 이루고 있었으며 5·6학년에서는 기악합주 활동에서 보조 악기로 사용되고 있었다. 관악기의 경우 리코더와 단소가 중요하게 다뤄지고 있었다. 현악기의 경우 직접 연주활동이 이뤄지는 악기는 없었다. 셋째, 교과서에서 중요하게 다루는 악기일수록 학생의 악기 인지도는 높고 선호도는 리코더를 제외하고 낮은 것으로 나타났다. 교과서에서 중요하게 다뤄지고 연주활동이 이뤄지는 악기는 학생이 자주 접하고 사용되는 악기임에도 선호도에서는 낮은 모습을 보였다. 반면에 연주를 직접 해보지 않은 악기에 대한 호감이 더 높았다. 성·별 선호도에서는 모든 악기에서 여자의 선호도가 남자보다 높은 것으로 나타났다. 그리고 6학년이 악기에 대해 흥미를 잃는 현상이 나타나고 있었다. 악기의 종류에 따른 선호도에서 관악기·현악기에 비해 타악기가 대체로 낮게 나타났다. 국악기는 서양악기에 비해 선호도가 더 낮은 것으로 나타나고 있었다. 이에 따른 음악 교과서에 사용될 악기에 대한 선택에서의 결론은 다음과 같다. 첫째, 악기에 대한 관심이 떨어지는 6학년을 위한 다양한 타악기의 개발과 보급, 또는 연주하기 쉬운 악기의 개발과 학년이 높아지면서 악기에 대한 선호도가 낮아지는 경향에 대한 문제를 분석하려는 후속 연구가 필요하다. 둘째, 국악기에 대한 학생들의 선호도를 높이기 위해 연주하기 쉽게 계량한 단소의 보급 노력과 더불어 실생활과 관련되고 흥미를 가지고 연주할 수 있는 다양한 국악곡을 개발할 필요가 있다. 셋째, 관악기로서 리코더에 편중된 부분을 해결하려는 노력이 필요하다. 넷째, 현악기에 대한 관심을 반영하기 위한 노력이 필요하다. This study was conducted to investigate the instruments for grades 3,4,5,6 in the elementary school textbooks and review the use frequency of each instrument, the characteristics according to instrument types, the teaching methods of playing instruments, and the relationship with teaching contents according to their grade. Also, it was intended to observe what relationship the instruments regarded as being important in textbooks have with the recognition and preference of students, and based on this, provide the information on selecting the instruments to be used for teaching to play instruments. The results were as follows. First, there were 41 kinds of instruments in the textbooks. Instrumental composition except percussion or rhythm instruments was simple, and string instruments were not being used in instrumental activities. The instrumental composition for the third and fourth grades was centered on percussion or rhythm instruments, and as the students advanced into the fifth and sixth grades, wind, string or melody instruments were on the increase. In the number of instruments, Korean traditional and western instruments are well balanced. However, when they were divided into percussion, wind, and string instruments, the number of percussion instruments was larger. In terms of frequency of use, Korean traditional and western instruments are relatively balanced. When instruments are divided into percussion, wind and string instruments, the heaviest weight was placed on percussion instruments, while the lightest weight, on string instruments. Second, students were taught to play the major instruments in textbooks in connection with each grade. In instrumental activities, percussion and some wind instruments were chiefly used, and in appreciation activities, students largely heard the tones of wind and string instruments. In covering the major instruments of percussion and rhythm instruments, the method of playing was handled for the third graders, performance activities were the main stream for the fourth graders, and for the fifth and sixth graders, the instruments were used as aids in instrumental ensemble activities. In case of wind instruments, recorders and dansos were handled significantly. In case of string instruments, there were no instruments used for a first-hand performance. Third, the instruments handled significantly in textbooks were better recognized by the students, while their preference for the instruments except recorders was low, though they were often exposed to students by being considered important in textbooks and used for performance activities. On the other hand, the students had a better feeling towards the instruments which they had not tried playing. In terms of gender difference, female students showed higher preference for all kinds of instruments than male students. Also, the sixth graders were losing interest in instruments. According to the kinds of instruments, students' preference for percussion instruments was higher than wind and string instruments. Their preference for Korean traditional instruments was lower than western instruments. Accordingly, the conclusion on selection of the instruments for music textbooks is as follows. First, it is needed to develop and supply various percussion instruments for the sixth graders who are losing interest in instruments, or develop the instruments which are easy to play. Also, it is needed that the follow-up study on analysis of the problem with a tendency for students not to prefer instruments is conducted. Second, to improve the preference of students for Korean traditional instruments, it is needed to try to supply dansos which are improved so that they can be played easily and develop diverse Korean classical music which is related to real life and can be played with interest. Third, it is needed to try to relieve the problem that wind instruments are concentrated on recorders. Fourth, it is needed to try to reflect the interest in wind instruments.

프로젝트 파이낸싱에 의한 민간주택개발사업의 리스크 관리방안

김주식 영남대학교 행정대학원 2008 국내석사

망시앙레짐 末期에 있어서 프랑스 借地農의 社會階層的 意味 : 北部 先進地域을 中心으로

김주식 고려대학교 1982 국내석사

Direct effect of chlorine dioxide, zinc chloride and chlorhexidine solution on the gaseous VSCs

김주식 서울대학교 대학원 2013 국내박사

This study focused to investigate the ability of aqueous anti-volatile-sulfur-compound (VSC) solutions which may eliminate gaseous VSCs by direct contact in a sealed space. Twenty ml of each experimental solution, 0.16% sodium chlorite, 0.25% zinc chloride, 0.1% chlorhexidine, and distilled water, was injected into a Teflon bag containing mixed VSCs (hydrogen sulfide, methyl mercaptan, and dimethyl sulfide) and mixed vigorously for 30 seconds. The VSC concentration was measured by gas chromatography before, immediately after, 30 minutes, and 60 minutes after mixing. The obtained results were as follows. 1. The sodium chlorite solution reduced the VSC concentration remarkably. After mixing, nearly all VSCs were eliminated immediately, and no VSCs were detected at 30 and 60 minutes after mixing. 2. Zinc chloride solution, chlorhexidine and distilled water reduced the VSC concentration about 30% immediately after mixing, and there was no further reduction. 3. With diluted 0.016% sodium chlorite solution, the concentration of the VSCs decreased to 45% of the baseline immediately after mixing and to nearly zero after 30 minutes. 4. There was no difference in decrease rate when different baseline VSC concentrations as 3 ppm and 7 ppm were mixed with the 0.016% sodium chlorite solution . The results suggest that 0.16% sodium chlorite (0.1% chlorine dioxide) solution has the effect of eliminating gaseous VSCs directly. It must be because it can release chlorine dioxide gas which may react directly with gaseous VSCs. Collectively, sodium chlorite is turned out to be able to eliminate gaseous VSCs directly. Considering its well-known inhibition of VSC production through antimicrobial action and oxidation of thiol groups, sodium chlorite is a promising candidate for more efficient and immediate VSC reduction.