• Nuclear Engineering and Technology
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• v.26 no.2
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• pp.247-256
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• 1994

The nuclide chain model used in SAV90 has been modified for the CASMO3/MEDIUM3 procedure. Since the default nuclide chain in SAV90, using 21 nuclides, is not sufficient to reproduce the CASMO3 results in the MEDIUM3 calculation, the extended nuclide chain models have been investigated and verified with various types of fuel assemblies. Among the extended nuclide chain models proposed, the 22 nuclide chain model, which contains only Pu238 additionally to the 21 nuclide chain, is recommended in terms of both accuracy and computing efficiency. Using this model core follow calculations for YGN-1 have been performed. The results showed good performance when compared to plant measurements.

• Explosives and Blasting
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• v.31 no.1
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• pp.41-48
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• 2013

Progressive collapse is generally defined as a local failure of structural members occurring due to abnormal load which results in the partial collapse or total collapse of a structure. Unlike progressive collapse, explosive demolition is a method of inducing the total collapse of structure by removing all or portion of structural members. In explosive demolition the partial collapse of the structural members can be controlled at appropriate time intervals by blasting, to induce the progressive collapse of the structure and control the collapse behavior. In this study, a nonlinear dynamic analysis was carried out in order to apply the progressive collapse process to explosive demolition design of the RC structure. The occurrence of progressive collapse of analytical models was examined according to the number of floors, the removed column height and span length. For models that resisted progressive collapse, progressive collapse resisting capacity was evaluated.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.1
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• pp.19-26
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• 2012

In this study the progressive collapse behavior of a moment frame with infill steel panels is evaluated using nonlinear static pushdown analysis. The analysis model is a two story two span structure designed only for gravity load, and the load-displacement relationship is obtained with the center column removed. To obtain local stress and strain as well as the global structural behavior, finite element analysis is conducted using ABACUS. Through the analysis the effect of the span length and the thickness of the steel plate on the progressive collapse behavior of the structure is investigated, and the effect of the dividing the infill panel using stud columns is also studied. According to the analysis results, the thickness of the panels required to prevent progressive collapse increases as the span length increases, and as the number of panel division increases the progressive collapse resisting capacity increases slightly but the effect is not significant. It is also observed that when the infill panel is installed in only a part of the span the progressive collapse resisting capacity is somewhat increased.

• Annual Conference on Human and Language Technology
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• 1995.10a
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• pp.290-296
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• 1995

본고는 한국어에 나타나는 동사의 연쇄현상(serialization in verbals)에 있어서 단일절(mono-clausal)내에서 소위 복합동사(compound verb)라 불리는 일련의 동사들의 결합 현상을 고찰한다. 연결사(linker/connective)를 매개로 서로 결합하는 동사 연쇄증에는, 일반적으로 동사하나가 하나의 사건을 나타내는데 비해 2개 이상의 동사가 배열됨에도 동시에 일어나 묶여질 수 있는 하나의 사건(single event)을 지칭하는 동사부류가 존재하는데, 이를 통해 동사 결합간 긴밀성을 우선적으로 유추할 수 있고, 역으로 통사적 현상에 의해 그 긴밀성이 확인된다는 점에서 문장 접속의 통어적 구성과는 다른 문법범주 형성을 뒷받침하는 개념적 근거가 된다. 여기에서는, 이러한 연속동사구성(연쇄동사)에 있어 행위성/비대격성을 지니는 동사들간의 연쇄현상을 제약하는 여러 원인들을 검토하고 아울러 이들의 의미적 범주선택을 고려한 거르개로서의 생성여과 규약을 제안한다.

• Tuberculosis and Respiratory Diseases
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• v.41 no.2
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• pp.165-170
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• 1994

B군 연쇄상구균(group B streptococcus or Streptococcus agalactiae)은 신생아 뇌막염과 균혈증의 원인균으로 알려져 있고, 우리나라에서는 현재까지 23예의 신생아 B군 연쇄상구균 감염 임상 증례가 보고되었다. 그러나 성인에서의 B군 연쇄상구균 분리 동정에 대한 분석은 보고되었으나, 폐렴 증례는 아직 보고된 바 없고, S. agalactiae의 penicillin에 대한 최소억제농도가 대표적 연쇄상구균인 S. pyogenes 보다 높고 동물실험 및 시험관검사에서 penicillin과 aminoglycoside을 병합사용할 경우 상승작용이 관찰되었기 때문에, 치료제로 penicillin 또는 cephalosporin 을 aminoglycoside와 병합투여하여야 하는 특정을 지니고 있다. 저자들은 74세 남자 당뇨 환자에서 B군 연쇄상구균에 의한 폐렴과 패혈증이 발생한 증례를 치험하여 보고하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.5
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• pp.1058-1063
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• 1997

Though the Preparata code of length 8 over $Z_{4}$ satisfies the chain condition, the Preparata code of length 16 or 32 over $Z_{4}$ does not satisfy the chain condition. In this paper we show that the Preparata code of length $2^{m}$ over $Z_{4}$ does not satisfy the chain condition for m=4, 5, 6 and 8 by investigating relations between weight hierarchy and chain condition.

• The Korean Journal of Applied Statistics
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• v.16 no.1
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• pp.71-85
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• 2003

In the economic design of the process control procedure, where quality is measured at certain time intervals, its properties are difficult to derive due to the discreteness of the measurement intervals. In this paper a Markov chain representation of the process monitoring procedure is developed and used to derive its properties when the process follows an ARIMA(0,1,1) model, which is designed to describe the effect of the noise and the special cause in the process cycle. The properties of the Markov chain depend on the transition matrix, which is determined by the control procedure and the process distribution. The derived representation of the Markov chain can be adapted to most different types of control procedures and different kinds of process distributions by obtaining the corresponding transition matrix.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.6
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• pp.238-245
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• 2010

Progressive collapse is defined as a collapse caused by sectional destruction of a structural member which links to other surrounding structures. Currently the design guidelines for the prevention of progressive collapse is not available in Korea. So, structural engineers have a difficulty in evaluating progressive collapse. In this study, the static and dynamic analysis to evaluate the methods and procedures are conducted using commercial analysis program for RC moment resisting frames. According to the study, DCR value of RC moment resisting frame system based on code in Korea is over 2 and it shows that it can't provide alternate load paths due to the progressive collapse. And additional reinforcement should be considered for the progressive collapse resistance. As a result of vertical deflection and DCR value of linear static analysis and linear dynamic analysis, the results of dynamic analysis were underestimated more than the result of static analysis. Thus, the dynamic coefficient value of 2 provides conservative estimation.

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.5
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• pp.108-116
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• 2017

In this study, the prototype structure of seismically designed steel moment frame was analyzed statically and dynamically in order to demonstrate the applicability of energy-based approximate analysis with the dynamic effect of sudden column loss in the evaluation of the collapse resistance and a method for assessing the sensitivity to progressive collapse was proposed. For the purpose of comparing the structural behavior of buildings with different structural systems, the sensitivity of the structure to the sudden removal of vertical members can be used as a significant measure. The energy-based approximate analysis prediction for the prototype structure considered in the study showed good agreement with the dynamic analysis result. In the sensitivity evaluation, the structural robustness index that indicates the ability of a structure to resist collapse induced by abnormal loads was used. It was confirmed that the proposed methods can be used conveniently and rationally in progressive collapse analysis and design.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.11 no.3
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• pp.17-25
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• 2016

This study aims to empirically examine serial entrepreneurship in Korea. Using the ICT startups survey data, I compare serial entrepreneurs with their novice counterparts in terms of business behaviors and performances. I found that serial entrepreneurs are more likely than novice ones to co-found a business with other entrepreneurs, enter a market with relatively large assets and expand their business into overseas market. They tend to put more importance on large-scale production and expansion strategy than first-time entrepreneurs. They are more likely to cooperate with suppliers and customers but less likely with the governments. From their experience of founding and operating businesses, the findings suggest that serial entrepeneurs are more market-oriented and more capable of managing internal human relations and external network of supply chain. Consequently, serial entrepreneurs show stronger early financial performance than novice entrepreneurs especially when they team up to found a business.