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成昌煥,徐祥烈 영남이공대학 1997 論文集 Vol.26 No.-
The results obtained from undrained torsional shear test for saturated sand lead to the following conclusions. 1. In the case of monotonic undrained torsional shear test, the more loose sand has, the more maximum excessive pore water pressure happens on a large scale. At that time, large shear strain happens. Also, in the case of one directional monotonic load, there is some possibility for a liquefaction to happen. 2. In undrained cyclic torsional shear test, if strain begins to generate, a loose sand comes to the liquefaction. In a dense sand, the behaviour of a rapid increase of strain is not shown. 3. According to the result compared constant volume test and undrained test, a difference of increased amount of pore water pressure by unloaded process in both tests is a little large. If the liquefaction strength is judged from increase of pore water pressure, loading number in the former is decreased by about 40%.
세그멘트 폴리우레탄 우레아에 기초한 블렌드계 고체전해질의 분자운동성과 이온 전도성
이상걸,이갑열,조남주 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
순수 고체 전해질과 겔형 고분자 전해질의 장점을 취합한 새로운 형태의 블렌드계 고체 전해질을 제조할 목적으로, 현재 유기 가소제로 널리 쓰이는 ethylene carbonate(EC), propylene carbonate(PC) 대신 실온에서 휘발성이 낮은 저분자량의 polyethylene g1ycol(PEG) 및 polyethylene glycol dimethylether(PEGDME)를 사용하였다. 또한, 고분자 매트릭스로는 지지체 역할 뿐만 아니라 염과의 복합체를 형성할 수 있도록 soft segment에 PEO/PPO 공중합체를, hard segment urea기를 도입한 세그멘트 폴리우레탄 우레아(segmented polyurethane urea, SPUU)를 사용하였다. 제조된 SPUU팀에 휘발성이 낮은 저분자량의 PEC 및 PEGDME와 리튬염을 부가하여 solution casting법으로 블렌드계 고체 전해질을 제조한 다음 교류 임피던스법으로 이온 전도도를 측정하였다. 이때 이온 전도도는 PEO 및 PEGDME의 분자량 및 함량에 의존함을 관찰할 수 있었다. In order to prepare a new blend-type electrolyte possessing the merits of both an intrinsic polymer electrolyte and gel-electrolyte, we report on a class of nonvolatile (dry) polymer electrolyte, prepared by plasticizing a segmented polyurethaneurea (SPUU) with solution of lithium salt in oligomeric poly(ethylene glycol) (PEG) and poly(ethylene glycol) dimethyl ethers (PEGDME). SPUU having PEO/PPO copo1ymer in soft segment and urethanerurea group in hard segment was used in order to prepare a mechanically stable blend-type electrolyte for for improving the affinity between PEC or PEGDME and matrix. and the ionic conductivity was measured by AC impedance spectroscopy. As a result, it was observed that the ionic conductivity depended on the molecular weight and contents of PEC and PEGDME.
성상율,구자섭,조근호,원승희,이종훈,박종한 대한생물치료정신의학회 2004 생물치료정신의학 Vol.10 No.1
Objectives : Nowadays many studies with MRI have reported structurai abnormalltles of corpus callosum of schizophrenic patients. However, the results are various and inconstant. In this study, we attempted to identify structural change of C O ~ U S cailosurn. Method : We measured the size of corpus callosum of the 24 schizophrenia patients (male 11, female 18) who were diagnosed by DSM-IV (19943, visited at department of psychiatry, catholic university hospital of Daegu from January 2002 to December 2003, by using midline sagittal slice of MRI. These results were compared with the size of corpus callosum of 25 controls (male 7, female 78). We divided corpus callosurn into 7 areas. We calculated and compared the areas of each subregion, mid-sagittal cerebral area, and entire corpus callosum. The results were analyzed by independent t-test. Result :When we compared subregion to corpus callosum adjusted wth mid-sagittal cerebral area, schlzoph-renia patients had significantly smaller genu (1.64k0.32 vs. 1.43k0.26 p<O.O5) and splenium (2.16f0.27 VS. 1.96+0.30 ; ~(0.05). Similarly, the ratio of total corpus callosum to midline sagittal cerebral area (%)(7.50*0.72 vs. 6.90t0.82 ~(0.05) was significantly smaller In schizophrenia than control group. Conclusion : In this study, we found significant differences in corpus callosum between schizophrenic patients and normal control group.
메타분석을 통한 가정특성 관련변인이 학업성취에 미치는 영향
박성열,구병두,임현걸 건국대학교 교육연구소 2000 論文集 Vol.24 No.-
This paper was designed to synthesize quantitatively the master's theses and doctoral dissertations focusing on effects of family background traits related variables on academic achievements in Korean. This task was accomplished by utilizing the meta-analysis technique of research integration as defined by Glass(1982). Basically, meta-analysis is a statistical analysis of the summary findings of many empirical studies. Its purpose is to draw reliable and general conclusions form a large and complex body of literature on a common topic. Thus, the primary purpose of this paper was to conduct a quantitative synthesis of 96 master's theses and doctoral dissertations focusing on the effects of academic achievements using family background traits as independent variable and academic achievement as dependent variable. Nine independent variable were chosen by means of in depth review of those previously mentioned 96 studies. The independent variables employed in this study include psychologcal environment, physical environment, family structure, public and private educational expenditures, education process, breeding and education method of parents, socio-economic status, parents' characteristics, and role expectation. These variable are cartegorized by two different groups according to the traits of factors in terms of family environment variable group and parent's characteristics variable group. This study set the following questions to be answered: (1) How large are the grand average effect size of variables of family background traits proposed in this study on student's academic achievement?; (2) How different the effect size of the two family background traits related variable groups, naimly family environment and parents characteristics variable group on student's academic achievement?; and, (3) How different the effect size of the nine family background traits related independent variables on student's academic achievement? In order to answer the research questions, the researcher followed the standard procedures as such locating published studies to collect primary data, analysing and cording the characteristics and outcomes of the studies, and carring out statistical procedures of mata-analysis to describe the overall and sub-variable effects. Primary source of data was decided to limit within the master's these and doctoral dissertations in order to achieve the reliability and validity of the study results. By using the CD-ROM titled 'masterㆍdoctoral dissertation index' published by National Central Library in 1995 and 1997, a total of 112 studies were located and collected. Out of 112 studies, 96 studies were selected by excluding those studies that are not possible to employ mata-analysis such as studies used qualitative research method. While classifying family background traits related variables some of studies were also excluded in this study due to failing a consensus among the five specialists participated in this process. The effect size were calculated by using two different approaches depending upon the applicability of effect size formula. One was by using mean and standard deviation of experimental group and their countpart. The other was using transformational formula suggested by Wolf(1986) for the studies that have not presented descriptive statistics. The result of this study may be summarized as follows: (1) The grand average degree of effects of the academic achievement factors proposed in this study turned out to be .33. This means that if the average size of effects of the academic achievement factors of the controlled group is 50 percentile in normal distribution, that of the experimental group becomes 62.93 percentile. As it were, the latter surpass the former by 12.94 percentile. (2) Between the two groups of academic achievement factors proposed in this study, in terms of family environment variable group and parent's characteristics variable group, the former factors showed the higher average effect size, its average effect size being .35. Considering the grand average degree of effects size of .33,it can be suggested that those family environment related variables effects more on the student's academic achievement compare to the variables of parents' characteristics. Among the nine family background traits related independent variables on academic achievements proposed in this study, the variable of educational process showed the highest average effect size of 1.40, as followed by socio-economic status(effect size of 0.55),role expectation(effect size of 0.48), and physical environment(effect size of 0.40). The effect size of these variables turned out to be bigger that the grand average effect size of .33. This result means that these variable effects on student's academic achievement a lot more compare to other variable proposes in this study. In fact, the effect size of those variable such as phychologcal environment(effect size of 0.27), breeding and educational method of parents(effect size of 0.27), family structure(effect size of 0.26), public and private educational expenditures(effect size of 0.26), and parents' characteristics(effect size of 0.14) turned out to be much smaller than that of previously mentioned variables. It means that the variable of psychologcal environment, breeding and education method of parents, family structure, public and private educational expenditures, and parents' characteristics effect less on student's academic achievement compare to the variables of educational process, socio-economic status, role expectation, and physical environment.
朴鐘烈,金星秀 영남대학교 공업기술연구소 1984 연구보고 Vol.12 No.1
The hematite specimens were prepared and reduced by hydrogen in the temperature range 600℃- 900℃ with the rate of reduction being measured by thermal gravimetric analyser. The weight loss, underisothermal condition, was accomplished by checking the end mark of silica spring with cathedometer. Making hypothesis that the reduction of iron oxide is controlled at the oxide/metal interface, derived rate equation and calculated rate constant and activation energy. It was concluded that 1) The reduction of iron oxide was shown to be controlled at the oxide/metal interface and rate equation r??d??(1-(1-R)¹/³)=Kㆍt was found to be fairly applicable. 2) Reduction rate constant was 1.54×10-²g/cm²ㆍmin at 600℃, 5.36×10-² at 800℃. It slows down at lower temperatures. 3) Activation energy for oxide/metal interfacial reaction was 11,200 cal/mole.
반응매체로써 용융염을 사용한 연소가스로부터 NO의 제거에 관한 연구(Ⅱ)
배성렬,김희택 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-
기포탑내에서 용융염(50mol% NH₄HSO₄, 50mol% NaHSO₄)과 V₂??계 촉매를 사용하여 온도범위 150∼180℃ O₂존재하에서 NH₃에 의한 NO의 환원반응에 대하여 조사하였다. NO의 환원속도는 NO의 농도에 대하여 1차 나타내었고 V₂??와 V₂??-NH₄Br-TiO₂-SiO₂촉매계에서1차 속도상수를 결정하였다. 또한 같은 온도범위내에서 용융염중의 NO에 대한 Henry 상수를 결정하였다. The kinetics of the reduction of NO by NH₃in the presence of O₂ in molten salts of 50mol% NH₄HSO₄and 50mol% NaHSO₄with V₂O as catalyst were investigated by chemical absorption method using a bubble column reactor at temperatures ranging from 150 to 180℃. The rate of the reduction of NO could be expressed as first-order with respect to the concentration of NO. The first-order reaction rate constants with V₂?? and V₂??-NH₄Br-TiO₂-SiO₂as catalyst were determined. The Henry's law constants of NO in the molten salts were determined in the same range of temperature.
n-CdS:Co/p-Si Heterojunction 태양전지에 대한 연구
柳相河,李相烈 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1
n-CDS:Co/p-Si heterojunction solar cells, fabricated by chemical bath deposition method of CdS:Co on single crystal silicon substrates, are reported. The structural, spectral response and V-I characteristics of n-CdS:Co/p-Si heterojunction solar cell studied. The open-circuit voltage, short-circuit current and fill factor of the n-CdS:Co/p-Si heterojunction solar cell was 0.35V, 29mA/cm^2 and 0.54 under 80mW/cm^2 illumination condition and the conversion efficiency was 5.48%.
농업환경보호를 위한 홍보용 CD-ROM 타이틀 개발에 관한 연구
박성열,박성래 建國大學校 附設 農業資源開發硏究所 1999 農資源開發論集 Vol.21 No.-
ABSTRACTThe objective of this study was to develop interactive CD-ROM title of agricultural environment for issuing the importance of agricultural environment.The subjects dealt with in the study were :(1) Review internal and external trends of agricultural environment : (2) Review a conception and importance of agricultural environment : (3) Identify the current situation of pollution in agricultural fields in Korea : (4) Structure the contents relation to agricultural environment for the development of +CD-ROM : (5) Develop interactive CD-ROM title of agricultural environment.This study was carried out thought literature review and utilization of ToolBookII software to develop CD-ROM title.The results of this study were as follows :(1) This CD-ROM title is helpful of understanding the conception of agricultural environment and furnishing data for study of agricultural environment ; (2) There has been little research which conducted to determine the importance of agricultural environment in Korea, Further, there has been few information for agricultural environment. Therefore, the CD-ROM title developed from the study will be used as a tool for public informed of the importance of agricultural environment : (3) Just few teaching aids exist in the context of agricultural environment in Korea. Therefore, the CD-ROM will be used to develop the basis with a teacher can make his or her teaching aids of agricultural environment. Also, a teacher may directly take advantage of the CD-ROM when he or she transfer agricultural environment information to his or her students ; (4) There is a need for system construction and development of agricultural environment, especilly need for networking of agricultural environment, The contents and information of CD-ROM will be used as basic data for the future system constuction.
염흥열,윤호선,김상필,이강석 순천향대학교 부설 산업기술연구소 1997 순천향 산업기술연구소논문집 Vol.3 No.2
본 논문에서는 무선 근거리 통신망에서의 프로토콜 구조를 분석한 후, 이를 바탕으로 무선 근거리 통신망에 적용 가능한 정보보호 규격을 제시하고, 기존의 보안 알고리듬의 문제점을 제시하며 그에 대한 해결 방안을 제시하여 정보보호 서비스를 실현하기 위한 정보보호 메카니듬을 도출한다.
n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구
유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.