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류성원(Sungwon Ryu),이종석(Jongseok Lee),강태호(Teaho Kang),백운경(Woonkyung Baek),양보석(Bosuk Yang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
This study is about the effect of time delay of damping force to a quarter-car vibration response. A high-performance magneto-rheological damper and a current driver were used to establish an artificial time delay of the damping force. A limit value of time delay of a damping force that does not aggravate the sprung mass vibration was suggested from the experiments using a quarter simulator.
강성원(Sungwon Kang),서영수(Youngsoo Seo),홍미정(Mijoeng Hong),양준환(Junhwan Yang),고일국(Ilkook Koh),강득윤(Deukyoon Kang),유상조(Sangjo Yoo),이채우(Chaewoo Lee),김명철(Myungchul Kim) 한국정보과학회 1999 정보과학회 컴퓨팅의 실제 논문지 Vol.5 No.4
본 논문에서는 ATM 통신프로토콜을 위한 자동시험시스템인 ACTS(ATM Conformance Test System)의 개발과 적용을 소개한다. ACTS는 ITU-T 또는 ATM Forum의 ATM 사용자-망 접속 표준을 준용하는 ATM 단말과 망장비의 프로토콜적합성을 확인하는데 사용된다. 본 논문에서는 ACTS 개발에 사용된 방법을 소개한 뒤, ACTS를 실제 ATM 단말과 장비에 적용한 사례들을 소개한다. ACTS의 적용을 통하여 시험대상 장비들이 지닌 프로토콜구현상의 문제점을 파악하였고, 문제에 대한 원인분석을 수행하였다. 또한 이러한 문제점들이 상호운용에 미치는 장애를 예측함으로써, ACTS를 상호운용하는 ATM 장비를 확보하기 위한 유용한 도구로 사용할 수 있음을 보인다. This paper presents development and application of ACTS(ATM Conformance Test System), an automated test system for ATM protocols. ACTS is a test system that checks conformance of ATM terminal and network equipment implementing either ITU-T or ATM Forum user-network interface. This paper, after presenting the methodology and process used for developing ACTS, conducts case studies of its applications to real ATM equipment. By applying ACTS, we were able to detect numerous problems in protocol implementations of ATM equipment and analyse causes of the problems, thereby demonstrating the efficacy of ACTS as an efficient automated testing tool. Furthermore, by predicting the potential effects of the problems on interoperability, we show how ACTS can be used as a useful tool for ensuring interoperable ATM equipment.
노성원,안동현,김양석,이방헌 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.1
Clozapine is an atypical antipsychotic agent that is more effective than the typical neuroleptics in the treatment of refractory schizophrenia. However, clozapine is also a drug associated with potentially serious adverse effects, such as cardiac complications as well as agranulocytosis. Clozapine-related agranulocytosis has been reported in Korea, whereas clozapine-related cardiac complications have not. We report a 31-year-old male schizophrenia treated with clozapine who developed a dilated Cardio-myopathy. We also reviewed literatures on dilated cardiomyopathy associated with clozapine treatment. This report is an attempt to raise the awareness of clozapine-related cardiac complications.
확률적인 이자율 및 확률적인 사망률을 고려한 금리연동형 종신보험의 수익성 분석에 관한 연구
장성원 ( Sungwon Jang ),심현우 ( Hyunoo Shim ),최양호 ( Yang Ho Choi ) 한국리스크관리학회 2021 리스크 管理硏究 Vol.32 No.3
보험회사는 보험상품에 대해 투자수익률, 위험률, 사업비, 해약률 등의 계리적 가정을 설정하여 장래 현금흐름을 계산하고 이를 바탕으로 수익성을 분석하여 회사가 원하는 목표수익에 도달할 수 있도록 보험료를 산정한다. 금리연동형 종신보험의 현금흐름을 산출하기 위해서는 대표적인 계리적 변수들, 그 중에서도 이자율과 사망률을 정확히 이해하고 예측하는 것이 중요하다. 그러나 선행연구에서는 고연령 사망률에 대한 특별한 고려가 부족하였으며 확률적 이자율과 확률적 사망률이 수익성에 미치는 영향을 별도로 분석하는 한계가 존재하였다. 본 연구에서는 고연령 사망률을 Coale-Kisker 방식으로 보정한 후, 이자율은 one-factor Hull-White 모형으로, 사망률은 Lee-Carter 확률적 사망률 모형으로 평가 및 예측하고, 미래이자율 및 미래사망률 시나리오를 적용하여 일반 및 저해지 금리연동형 종신보험 상품의 수익성을 분석한다. 분석결과, 확률적 이자율 시나리오의 수익성과 그 시나리오들의 평균인 결정적 이자율 시나리오의 수익성에는 차이가 존재하지만 확률적 사망률 시나리오 시 수익성과 결정적 사망률 시나리오 시 수익성에는 차이가 없다는 것을 확인하였다. 그리고 사망률 감소 추세를 포함한 시나리오가 그렇지 않은 경우 대비 예정보험료의 감소효과로 인해 수익성이 낮음을 본 연구가 보여준다. 비슷한 이유로 일반 보험에 비해 저해지 보험의 예정 보험료가 더 낮아 저해지 보험의 수익성이 대체로 더 낮음을 연구결과가 나타낸다. An insurer calculates future cash flows using actuarial assumptions such as yield rates, mortality rates, expense, and lapse rates for an insurance product. Based on these cash flows, the insurer conducts profitability analysis and determines an insurance premium until a profit reaches a target level. In order to calculate cash flows of interest-sensitive whole-life insurance, it is crucial to accurately understand and predict actuarial variables, especially the interest rate and mortality rate. Prior studies in the literature, however, are somewhat limited in that they lacked in special treatment for mortality at advanced ages and they separately analyzed the effect of either interest rate or mortality rate on profitability. In this study, after correcting the old-age mortality rate via the Coale-Kisker model, we estimate and forecast the interest rate by the one-factor Hull-White model and the mortality rate by the Lee-Carter model. We analyze profitability of normal and low-surrender interest-sensitive whole-life insurance with such estimated and forecasted scenarios. We find that there exists a difference in average profitability between when the stochastic interest rate scenarios are applied and when the deterministic interest rate scenario with their averages is applied. We find, however, that there is no difference in average profitability between the stochastic mortality scenarios and the deterministic mortality scenario. In addition to that, our analysis shows that compared to an otherwise identical scenario, the profitability in stochastic mortality scenarios with a decreasing mortality trend is lower due to its lower premium. Likewise, compared to a normal insurance, the profitability of a low-surrender insurance is usually lower due to its lower premium.
최성원(Sungwon Choi),장옥진(Ok-Jin Jang),김양태(Yang-Tae Kim) 한국중독정신의학회 2014 중독정신의학 Vol.18 No.2
Objectives : The objectives of this study were to investigate intertemporal choice in patients with alcohol dependence and to examine whether impulsivity or working memory is related to intertemporal choice in patients with alcohol dependence. Methods : Fifty alcohol dependence patients and fifity healthy controls were recruited in this study. All participants were male. All patients were subjected to the following tests : Delay Discount-ing Task (DDT), the Wisconsin Card Sorting Test (WCST), the Barratt Impulsiveness Scale-11 (BIS-11), and the Korean version of Michigan Alcohol Screening Test (MAST-K). Results : Com-pared to the control group, the alcohol dependence group showed higher delayed reward discounting rate in DDT. The performance on the WCST of alcohol dependence group was significantly poorer than that of the control group. Alcohol dependence group scored higher than controls in the total score of the BIS-11 and the motor subscale scores. The perseverative error in WCST was significantly correlated with the 1 day indifference point (r=-0.505, p<0.01) and 2 day indifference point(r=-0.388,p<0.01) in DDT. However, the indifference point in DDT did not show significant relationships with the score of BIS-11 or MAST-K within the alcohol dependence group. Conclusion : Intertemporal choice in patients with alcohol dependence had more delayed reward discounting compared to the control group. Delayed discounting and impaired working memory were significantly correlated. Delayed discounting and self-report mea-sure of impulsivity or alcohol dependence were not correlated.
Common occurrence of internal repeat symmetry in membrane proteins
Choi, Sungwon,Jeon, Jouhyun,Yang, Jae-Seong,Kim, Sanguk Wiley Subscription Services, Inc., A Wiley Company 2008 Proteins Vol.71 No.1
<P>Symmetry plays significant roles in protein structure and function. Particularly, symmetric interfaces are known to act as switches for two-state conformational change. Membrane proteins often undergo two-state conformational change during the transport process of ion channels or the active/inactive transitions in receptors. Here, we provide the first comprehensive analyses of internal repeat symmetry in membrane proteins. We examined the known membrane protein structures and found that, remarkably, nearly half of them have internal repeat symmetry. Moreover, we found that the conserved cores of these internal repeats are positioned at the interface of symmetric units when they are mapped on structures. Because of the large sequence divergence that occurs between internal repeats, the inherent symmetry present in protein sequences often has only been detected after structure determination. We therefore developed a sensitive procedure to predict the internal repeat symmetry from sequence information and identified 4653 proteins that are likely to have internal repeat symmetry. Proteins 2008. © 2007 Wiley-Liss, Inc.</P>
강성원(Sungwon Kang),이채우(Chaewoo Lee),양준환(Junhwan Yang),서영수(Youngsoo Seo) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.7
통신 시스템에서와 같이, 둘 또는 그 이상의 개체가 사용되어 어떤 기능을 수행할 때, 개체들이 함께 그 기능을 올바르게 수행하는 능력을 상호운용성이라고 부른다. 적합성과 더불어 이와 같은 능력은 통신시스템구현의 올바른 기능을 위하여 필수적이다. 본 논문은 통신프로토콜에 대하여 상호운용시험스위트를 도출하는 문제를 다룬다. 시험스위트 도출을 목적으로 상호운용성, 상호운용시험구조, 상호운용시험항목의 개념들을 통합하고 상호 연결하여 일관된 상호운용시험체계를 개발한다. 또한 상호운용시험과 적합성시험을 엄밀히 구별하여 이 두 시험간의 중복을 피함으로써, 효율적인 상호운용시험스위트 도출방법을 제시한다. When two or more entitles are employed to perform a certain task as in the case of communication protocols, the capability to do so is called interoperability and, like conformance, considered the essential aspect of correctness of communicating systems. This paper deals with the problem of deriving interoperability test suite for the control part of communication protocols. A coherent framework for interoperability testing is developed such that the notions of interoperability, interoperability test architecture, interoperability test case and interoperability testing are integrated and interrelated for the purpose of interoperability test suite derivation. By carefully separating interoperability testing from conformance testing, we develop an efficient interoperability test suite derivation method.