Digital Dynamic Compensation Methods of Rhodium Self-Powered Neutron Detector

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

The best method is selected among the 3 digital dynamic compensation methods which are developed or applied for the Rhodium self-powered neutron detector. The three digital dynamic compensation methods are the existing Dominant Pol Tustin method of the COLSS(Core Operating Limit Supervisory System), the Direct Inversion method and Kalman Filter method. The Direct Inversion method is an improved method of D. Hoppe and R. Maletti and the Kalman Filter method is developed using the Kalman Filter. Response times of the compensated signals to achieve 90% of a step input are 28.1, 17.2 and 6.5 seconds respectively for the same noise gain telling that the Kalman Filter method is the best amens the 3 methods.

Effects of Supplementary Blood Meal on the Content of Carnosine and Anserine in Broiler Meat

Auh, JoongHyuck,Namgung, Nyun,Shin, KwangSuk,Park, SeWon,Paik, InKee Japan Poultry Science Association 2010 Journal of Poultry Science Vol.47 No.4

<P>The objective of this research was to evaluate the effects of dietary supplementation of blood meal (BM) on carnosine (L-Car) and anserine (L-Ans) content in the chicken breast muscle (CBM). In Experiment 1,384 Ross® broiler chicks of 1d old were assigned to 3 dietary treatments: 100% basal diet (BM-0), 95% basal diet+5% BM (BM-5), and 90% basal diet+10% BM (BM-10). In Experiment 2, 144 Ross® broiler chicks of 1 d old were fed BM-treated diets, including 0% BM (BMI-0), 5% BM (BMI-5), and 10% BM (BMI-10), with isocalorie and isonitrogen adjustment. Broilers were reared in stainless steel cages for 5wk in both experiments. In Experiment 1, the content of L-Car and L-Arg increased as the birds aged. The increase was quadratic in L-Car and linear in L-Ans. The content of L-Car linearly (<I>P</I><0.01) increased as the level of BM increased at wk 4 and 5, but there was no significant difference between BM-5 and BM-10 treatment. Conversely, the content of L-Ans linearly (<I>P</I><0.01) decreased as the level of BM increased at wk 1, 3, 4, and 5. In Experiment 2, the content of L-Car and L-Arg showed quadratic increase as the birds aged. The content of L-Car showed a significant (<I>P</I><0.01) negative quadratic response as the level of BM increased at wk 1, 3, and 5. The content of L-Ans showed a significant (<I>P</I><0.05) positive quadratic response as the level of BM increased at wk 3 and 5. The growth performances were not significantly affected by treatments in Experiment 1; in Experiment 2, however, a linear decrease (<I>P</I><0.01) in feed intake and weight gain, and a linear increase (<I>P</I><0.01) in feed conversion ratio were observed as the BM was increased. In conclusion, addition of 5% BM in broiler diet increases the L-Car but not L-Ans in CBM.</P>

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

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.

Reactor Power Cutback Feasibility to a 12-Finger CEA Drop to Avoid Reactor Trips

Auh, Geun-Sun,Yoo, Hyung-Keun,Lim, Chae-Joon,Kim, Hee-Cheol,Lee, Sang-Keun Korean Nuclear Society 1995 Nuclear Engineering and Technology Vol.27 No.1

EPRI URD requires that the reactor be capable of accommodating an unintended CEA drop without initiating a trip and operating at a reduced power with ay single CEA fully inserted. YGN 3 and 4 reactors have 12-finger CEAs, and the CPCS will trip the reactor due to their large reactivities when one of them is dropped at a high power. The ABB-CE reactor power cutback system has been proposed to be used against the 12-Finger CEA drop to avoid the reactor trips. The results of study show that the reactor power cutback can prevent the reactor trips of the 12-Finger CEA drop when the CPCS has enough operating thermal margin (more than 9% for YGN 3&4 Cycle 1). It is noted, however, that the probability of a 12-Finger CEA drop is very low, less than one per 100 reactor years for YGN 3& and System 80$^{+}$ plants.

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 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

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).

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.

Current Status of Passive Solar Building Applications in the Republic of Korea

Auh, Paul Chung-Moo The Korean Solar Energy Society 1987 한국태양에너지학회 논문집 Vol.7 No.2

In the past few years, the subject of passive heating has been the major area of our concern due to the specific climate conditions prevailing in our region. More recently, however, other important issues such as retrofitting, passive cooling, optimized integration of conservation and passive solar, and daylighting have emerged as the areas of frequent discussions. KIER, the sole R&D organization in solar energy technologies, has accomplished significant results in passive building designs and actual demonstrations of experimental passive buildings. As a result of such endeavor by KIER, the passive solar buildings have been very well received by the Korean public. The current number of passive solar buildings in Korea is well over 1,600 (as of Dec. 1986). In this paper, broad aspects of the present status of passive solar technology utilization in Korea are presented.

Designing an Interdisciplinary Learning Environment for Conservatory Students: Using the Liberal Arts to Expand Education and Better Support Performance Interpretation

Auh, Yoonil,Shin, Yeon Sook The Korea Contents Association 2014 International Journal of Contents Vol.10 No.2

This paper discusses designing an interdisciplinary learning environment to promote learning of the liberal arts for advanced music students in order to expand the boundaries of their education experience beyond the technical mastery of their musical instruments. The paper discusses the utilization of salient features of information, communications, and technology and the use of instructional theory to promote the understanding of how individual pieces of music can be connected to knowledge of the context in which they were created to support the understanding of the relationship between experience in the world and musical composition.

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.