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        • SCIESCOPUSKCI등재

          Development of Transient Simulation Code for Pressurized Water Reactors

          Auh,,Geun-Sun,Ko,,Chang-Seog,Lee,,Sung-Jae,Hwang,,Dae-Hyun,Kim,,Dong-Su,Chae,,Sung-Ki Korean Nuclear Society 1987 Nuclear Engineering and Technology Vol.19 No.3

          발전소 과도현상과 비냉각재 상실사고를 모의할 수 있는 가압경수로발전소 모의코드 MCSIM을 개발하였다. 원자로 냉각재계통은 에너지 방정식과 운동량 방정식을 분리 취급하면서 Drift Flux 2상 유동모델, 적분 운동량 방정식 등을 사용하여 모델링하였다. 증기발생기의 모사는 Pot Boiler 모델을 사용하였고, 2차계통을 위해서는 분리 취급된 정상상태 에너지 방정식과 운동량방정식을 핵출력 계산을 위해서는 점 동특성 방정식을 사용하였다. 현재의 코드성능을 시험하기 위해 완전 냉각재 유동상실사고와 제어봉 집합체 인출 사고를 계산하여 그 결과를 원자력 5/6호기 최종 안전 보고서의 결과와 비교하였다. A plant simulation code, MCSIM (Micro-Computer SIMulator), has been developed to simulate plant transient accidents for pressurized water reactors. Reactor coolant system is modeled using decoupled energy and momentum equations, drift flux two-phase flow model and integral momentum equation. A two-fluid pressurizer model is used to simulate the pressurizer dynamics. Pot Boiler model is used for steam generator, steady-state decoupled energy and momentum equations for secondary side system, and point kinetics equations for nuclear power calculation. For test of the present version of MCSIM, complete loss of flow and RCCA withdrawal accidents are calculated with MCSIM. The results are compared with those in FSAR of KNU 5 & 6.

        • SCIESCOPUSKCI등재

          A Steady-State Margin Comparison between Analog and Digital Protection Systems

          Auh,,Geun-Sun,Hwang,,Dae-Hyun,Kim,,Si-Hwan Korean Nuclear Society 1990 Nuclear Engineering and Technology Vol.22 No.1

          아날로그와 디지탈 보호계통의 정상상태 여유도를 비교하였다. 비교된 예는 웨스팅하우스사의 OP Delta T 및 OT Delta T 계통과 CE사의 CPCS 계통이다. 안전해석 방법의 차이에 의한 여유도 영향을 제거하기 위해 Dynamic Offset은 고려하지 않았다. 핵연료봉 중심선의 용융을 방지하는데 있어서 디지탈 보호계통이 아날로그 보호계통보다 약 30% 출력 정도의 운전 여유도를 더 가졌다. DNB를 방지하는데 있어서는 주기말에서는 양 보호계통이 비슷한 여유를 가졌으나 주기초에서는 디지탈 보호계통이 약 10%의 더 많은 운전여유를 가지는 것으로 판단된다. A steady-state margin comparison study was performed between analog and digital protection systems. The systems compared are the thermal overpower and overtemperature delta T system of Westinghouse, and Core Protection Calculator System of Combustion Engineering, Inc. No dynamic offset was considered to eliminate the margin differences by different safety analysis methodologies. The result shows that the digital protection system has about 30% more rated power margin than the analog system in protecting against the fuel rod centerline melting. The digital protection system is shown to have almost same margin with the analog protection system in preventing the DNB at EOC (End of Cycle) even if the digital protection system has about 10% more margin at BOC(Beginning of Cycle).

        • Aligning Benefits with Payments in a Consumer Financing Context - A Test of the Alignment Hypothesis

          Auh,Seigyoung,Chuan,Fong,Shih 한국마케팅과학회 2006 한국마케팅과학회 학술대회 발표 논문집 Vol.- No.-

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This article extends the literature on consumer financing decisions by drawing on mental accounting and prospect theory. Specifically, the authors test the alignment hypothesis, which states that consumers prefer financing schemes that not only match the length of benefits with payments but also employ corresponding patterns. Through four studies, the authors find general support for the alignment hypothesis.

        • SCIESCOPUSKCI등재

          A Novel Maltopentaose-Producing Amylase as a Bread Antistaling Agent

          Auh,,Joong-Hyuck,Lee,,Su-Yong,Yoo,,Seung-Seok,Son,,Hyun-Ju,Lee,,Jae-Woo,Lee,,Sung-Joon,Kim,,Young-Bae,Park,,Kwan-Hwa Korean Society of Food Science and Technology 2005 Food Science and Biotechnology Vol.14 No.5

          A maltopentaose-producing amylase (G5-amylase) from Bacillus megaterium KSM B-404 was applied to retard bread retrogradation. Retrogradation rates were determined by differential scanning calorimetry. Gel permeation chromatography determined changes in maltooligosaccharide composition and the molecular weight profiles of carbohydrate tractions. The baking process produced maltopentaose and maltotriose by the hydrolysis of starch molecules into small units. Amylose and amylopectin degradation as well as maltooligosaccharides produced by the enzyme were likely responsible for retarding starch retrogradation. Overall, addition of G5-amylase reduced the starch retrogradation rate, and was as effective as Novamyl(R), a commercial enzyme.

        • KCI등재

          The Perceived Occupational and Clients' Natures by the Participants of the Long-term Care-services Providers' Education in Korea

          Auh,,Seong-Yeon,Paik,,Sun-Ah,Kim,,Eun-Joo Korean Society for Health Education and Promotion 2010 보건교육건강증진학회지 Vol.27 No.5

          목적: 본 연구는 요양보호사 교육 수료생들을 대상으로 요양보호사의 업무 인지와 요양보호서비스 대상자 인지 정도를 예측변인들을 통해 검증함으로써 요양보호사가 인지하는 직업의 전문성 정도를 파악하는 것을 연구목적으로 한다. 방법: 응답자가 직접 기입하는 '자기기입식질문지법'을 이용하였고 불성실 응답 및 다문항 미기재 설문지를 제외한 총 2백83부를 분석에 사용하였다. 관련요소들의 기술적 통계를 통해 요양보호사 업무에 대한 인지 정도 및 서비스 대상자의 특성에 대한 인지 정도를 살펴보았다. 그리고 위 두 변수와 관련 요소들간의 상관관계를 알아보고, 어떠한 요소가 요양보호사 업무에 대한 인지 정도 및 서비스 대상자의 특성에 영향력을 갖는지 알아보기 위하여 다단계회귀분석을 실시하였다. 결과: 요양보호사 업무 인지에 관한 단계적 회귀분석에서 요양보호사는 전문직업이다(${\beta}$=.300)와 업무 특성에 관한 지식을 갖고 있다(${\beta}$=.254)가 유의미하게 나타났다. 또한 요양보호서비스 대상자 특성에 관한 단계적 회귀분석 결과로 가족들의 지지(${\beta}$=.187)와 요양보호사 업무인지 정도(${\beta}$=.509)가 유의미한 변인으로 밝혀졌다. 결론: 이상의 결과를 통해 본 연구에서 제기한 요양보호사 업무에 대한 인지정도 및 서비스 대상자 특성에 영향력을 갖는지에 대한 연구결과를 제시하였다. Objectives: The purpose of this study is to investigate the perception of LTCP trainees' on their professional. To accomplish the purpose, the perceived occupational nature and perceived clients' nature among the participants in the LTCP education are examined with the predicting variables. Methods: The participants of this study were composed of 320 people who have completed the long-term care provider certificate program. The participants were from 5 different long-term care provider licensing institution in the region of Gangdong-Gu, Seoul. Total of 320 self-administered questionnaires were distributed from June 2, 2008 to October 2, 2008 and 297 questionnaires were collected. Among them 283 surveys were analyzed. Results: In this model, active family support and recognition of task characteristics for the LTCP were the significantly predicting with beta of .187 and .507. The effect from active family support was remained significantly as model progressed. The magnitude of F-value and R-square value were significant. Conclusion: The results from this study will be helpful for the scholars who have investigated on the LTCP education program development as well as policy makers who have tried to supply dependable LTCP to the needy elderly and their families. In turn, the results from this study may empower constituents to make informed decisions about, and easily access, existing health and long-term care options.

        • KCI등재

          Who's at Risk of Digital Divide? : Analysis of a U.S.-Community Data

          Auh,,Seong-yeon 한국실과교육연구학회 2008 實科敎育硏究 Vol.14 No.4

          이 연구는 정보화 사회로 이전됨에 따라 나타나는 새로운 사회적 불평등인 정보격차에 대한 위험요인을 규명하고자 수행되었다. 정보화 사회로의 변화는 전자정부라고 하는 정보통신기술을 바탕으로 하는 국가의 서비스를 창조하였고 전자정부 서비스는 이미 우리사회에서 다양한 형태로 제공되어 지고 있다. 하지만 그 전자정부서비스의 사각지대인 정보격차의 문제점은 최근에야 학제 간에 논의가 시작되었고, 그 위험요인에 대한 논의 역시 미비한 실정이다. 이에 본 연구는 미국의 지역사회 자료를 (n=4,002) 다항적 로지스틱 분석을 함으로써 1차적 정보격차의 위험요인을 규명하고자 하였다. 본 연구의 결과, 연령변인과 교육수준, 거주 지역, 건강상태, 그리고 독거노인의 지위, 등이 1차적 정보격차(접근성)의 위험요인으로 나타났다. 즉, 나이가 들수록, 교육수준이 낮을수록, 시골에 거주 할수록, 건강상태가 좋지 않을수록, 독거노인의 경우에 다른 집단과 비교하여 인터넷에 대한 접근성이 떨어지는 것으로 보고되었다. 반면에 선행연구와는 달리, 1차적 정보격차에 대한 성별과 경제수준에 의한 차이는 미국지역사회의 대표적 자료를 대상으로 분석한 결과 유의한 차이를 보이지 않는 것으로 보고되었다. 이러한 연구 결과는 정보격차의 해소 및 정보화 교육을 실시함에 있어 대상 선정의 우선권의 누구에게 부여하는가 하는 문제에 있어서 그 시사점을 준다. 본 연구 결과를 바탕으로 아동에 의한 성인세대(부모, 조부모)로이 기술력전이를 위한 실과교과 내용개발이 제안되었다. 또한 빈곤아동의 정보격차 해소를 위한 학교의 컴퓨터교육 및 컴퓨터실의 중요성이 제안 되었다. As the e-government becomes a key concept in scholarly and policymaker dialogues about democratic government and public services, a new form of social inequality, digital divide appears. The purpose of this study is to investigate the first level digital divide. By employing the ordered logistic regression models, a representative community sample drawn from the Iowa Family Survey (n=4,002) was analyzed to identify the individuals who's at risk of digital divide. Effects of structural variables such as age, education and region and individual characteristics' variable such as perceived health and senior living alone status were significant in the models. However, the access to Internet did not differ by individual's income or gender in this study. This study suggested individuals at risk of digital divide such as the seniors living alone in non-metro areas or seniors who were less educated could be left behind in e-government and facing greater risk at the digital divide. Also, this study suggests that (a) it might be helpful to reduce the digital divide in the society if the Practical Art Education's curriculum includes contents regarding technical defusion by children into their parents or grandparents; and (b) computer classes or computer labs at school could be the critical resources for the children from the less advantaged families to gain their digital inclusion in the society.

        • A Latent Variable Structure Equation Modeling Approach: Family Contexts Predicting School Adjustments Among Korean Secondary Students

          Auh,,Seong-Yeon,Kim,,Eun-Joo The Korean Home Economics Association 2007 International Journal of Human Ecology Vol.8 No.2

          Korean secondary school students (n=263) responded to surveys measuring their family contexts and school adjustment during the time period August-September 2004. Structure Equation Modeling tests were conducted to identify the nested model on school adjustment, a latent variable constructed with peer relations, teacher-adolescent relations, and academic attitude. In the nested model, parental involvement was a powerful predictor for school adjustment. Family conflict had a negative impact on school adjustment and was statistically significantly when correlated with the other predictors in the model. These finding suggested that family contexts play an important role in Korean adolescents' school adjustment. Hence, adolescents' perceived GPA level and satisfaction for school were important predictors for school adjustment.

        • Pattern of Newspaper Readership: A Korean Case

          Auh,,Taik,Sup 연세대학교 동서문제연구소 1981 東西硏究 JOURNAL OF EAST AND WEST STUDIES Vol.10 No.1

          This report reviewed some new trends and techniques in newspaper readership research and offered some suggestions for what editors can do to make their newspapers more appealing to their readers. It was argued in the paper that simple readership percentages should not be used as the sole judgmental criterion in deciding which items to push and which to drop. Factor analysis should be employed to find out which items cluster with other items before deciding which ones to cut back or drop. Another model for deciding what to inclued in a newspaper is Philip Meyer's "prioritization" model. The model combines a measure of interest in various subjects with a measure of whether or not such interest is associated with reading the newspaper. Meyer's model looks like this : Meyer argues that subjects in category A, which have relatively high levels of interest and a positive association between interest and readership of the paper, should be watched carefully because they could represent small but important market segments whose coverage should be, at the very least, maintained. Finally, Meyer advocates passing over subjects in category D, where interest is low and what interest there is has little or no asociation with reading the newspaper To draw a comparision with the Meyer's model, the McCombs model looks at readership patterns to infer whether a certain subject is drawing people to newapaper. The Meyer model directly measures the association between interest in a subject and newspaper readership. Future readership studies may utilize both the McCombs and Meyer models in deciding what to cut back or eliminate. That is, one could use the McCombs method to identify which items have low readership and are usually read in combination with other items, and the Meyer method to check on the level of interest in these items and whether this interest is associated with reading the newspaper.

        • SCIESCOPUSKCI등재

          Margin Benefit Assessment of A Digital Monitoring System for Existing Analog Plants

          Auh,,Geun-Sun,Yoon,,Tae-Young Korean Nuclear Society 1994 Nuclear Engineering and Technology Vol.26 No.2

          운전중인 Westinghouse형 원자력 발전소에 디지탈 감시계통을 설치하였을 시의 정량적인 여유도 잇점을 계산하였다. 적용된 발전소는 영광 원자력 1호기 6주기이며 참조한 디지탈 감치계통은 ABB-CE 사의 COLSS이다. 고려된 핵연료 설계제한 한계는 DNBR과 LUCA Fq이다. 평가를 위해 기존 CAOC 한계내에서 200가지의 3-D 출력 분포를 계산하였다. 영광 1호기 6주기의 DNB 관련 가장 제한적인 사고인 CEA 인출사고를 해석하였다. 평가결과 DMS를 설치하면 DNB와 LOCA Fq 관점에서 모두 7%출력 증가 효과를 가져올 수 있을 것으로 나타났다. DMS를 설치하면 PCI 한계도 감시할 수 있다. Margin benefits are quantatively assessed when a Digital Monitoring System(DMS) is assumed to be installed to an operating Westinghouse analog type plant. Applied plant and cycle is YongGwang Unit 1 Cycle 6. The referenced digital monitoring system is the COLSS (Core Operating Limit Supervisory System) of ABB-CE. Considered fuel design limits are DNBR and LDCA Fq. 2003-D Power distributions within the present CAOC (Constant Axial Offset Control) limits are calculated for the analysis. The most limiting DNB prevention event of CEA Withdrawal is analyzed with the ROPM (Required OverPower Margin) concept of ABB-CE. The result show that the DMS can bring around 7% more margins for both DNB and LOCA Fq standpoints of view. The DMS can also monitor the PCI (Pellet-Cladding Interaction) limits.

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