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        • 콘크리트 품질ㆍ시공ㆍ유지관리의 조기판정 및 LCC분석 시스템 개발

          손용우(Sohn Yong-Woo),이증빈(Lee Cheung-Bin),최미라(Choi Mi-Ra),박봉수(Park Bong-Soo),안영기(Ahn Young-Ki) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-

          In the resent years, the early evaluation of concrete quality, construction and maintenance has been considered as all is of major concern due to the increase of loading and the degradation of structures related with time. This paper presents evaluation of structural safety performance using measured data of construction, on the basis of a field measurements for the prevention of unreliable concrete works. Measurements analyzed in this paper are early quality condition, performance assessment and total LCC(life cycle cost), which includes the initial cost, the costs of inspection, repair, and failure. Thus, a quantitative assessment model of resistance capacity was developed here to meet the requirement for deteriorated concrete structures. The model focuses on damage mechanisms of concrete structures deteriorated by initial damage factors for concrete quality and environment factors such as chloride and carbonation attacks. These results could provide useful LCC information for concrete structures interested in design, construction and maintenance.

        • KCI등재

          신현실주의 관점에서 본 북한의 핵정책 고찰(1945~2009)

          손용우(Yong-Woo Sohn) 한국국제정치학회 2012 國際政治論叢 Vol.52 No.3

          이 글은 북한의 핵문제를 동북아 역내 강대국 국제정치의 비극적 산물로 인식하면서 신현실주의 관점에서 북한의 핵정책 목적이‘안보의 극대화’에 있음을 규명하고자 한다. 그리고 “북한의 생존과 안보를 위협하는 대외적 구조가 지속됨에 따라서 북한의 핵무장 추구는 강화됐다”는 가설을 냉전(1945)부터 제2차 핵실험(2009)까지 북한의 핵확산 역사에 적용하여 그 타당성을 논증하고자 한다. 냉전기 북한의 핵무장은 역내 고강도 무정부성과 안보딜레마에서 오는 ‘두려움’과 한반도 분단에 따른 항구적인 안보위협의 ‘공포’로부터 유래하고 있다. 탈냉전기 북한은 세력균형과 공격방어균형, 그리고 남북한 군사력 균형의 추가 모두 붕괴됨으로써 이를 보정하기 위한 방책으로 핵무장 추진을 더욱 강화하였다. 북한은 제1차 북핵위기에서 대체이익의 확보를 위해 핵무장 옵션의 유지 속에서 핵시설을 동결했지만, 안보위협의 지속성으로 우라늄 핵개발이라는 ‘은밀한 핵확산’을 시도하였다. 북한은 제2차 북핵위기에서 6자회담에 편승하면서도 두 번의 핵실험을 포함한 ‘공개적 핵확산’을 추진하여 세계 9번째 핵보유국을 달성하였다. 따라서 냉전과 탈냉전을 관통하여 북한의 핵정책은 핵무기체계의 완성을 위하여 ‘핵확산의 일관성’을 보였으며, 머지않아 ‘실전배치 핵보유국’의 단계로 나아갈 것으로 전망된다. With North Korea’s nuclear problem taken as a tragic byproduct of superpower politics in Northeast Asia, this study adopts a Neorealist perspective and attempts to attest that North Korea’s nuclear ambition lies in realizing the ‘maximization of security.’ The main hypothesis is the proposition that as the international structure threatening the security of North Korea has remained, North Korea’s pursuit of nuclear armament has continued to be strengthened. This is proved by revisiting the history of nuclear proliferation from the initial point of the cold war era (1945) to 2nd nuclear test crisis (2009). In the Cold War era, North Korea’s nuclear armaments of a ‘self-help’ measure was originated from the ‘fear’ of high-intensity anarchy and security dilemma, and also from the division of the Korean peninsula. In the Post-Cold War era, North Korea intensified its nuclear armaments to overcome the security threat resulting from the collapse of the balance of power, offense-defense balance and North-South military balance. During the 1st nuclear crisis, North Korea agreed to freeze its nuclear facilities in order to obtain the negotiation benefits with nuclear option, but it pursued the strategy of ‘clandestine proliferation’ called uranium nuclear program. During the 2nd nuclear crisis, although North Korea joined the six party talks, it pushed forward ‘public proliferation’ by launching two nuclear tests. Finally, North Korea has achieved the status of the 9th nuclear power state in the world. This study concludes that North Korea’s nuclear policy from the Cold-War era to present has manifested what we call ‘proliferation consistency’ and prospects that North Korea will become a Nuclear Weapon State based on the nuclear-warhead missile forces in the near future.

        • 콘크리트 吾질 시공 유지관리의 조기판정 및 LCC분석 시스템 개발

          손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박봉수 ( Park Bong-soo ),안영기 ( Ahn Young-ki ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2

          In the years, the early evaluation of concrete quality, construction and maintenance has been considered as all is of major concern due to the increase of loading and tie degradation of structures related with time. This paper presents evaluation of structural safety performance using measured data of construction, on the basis of a field measurements for the prevention of unreliable concrete works. Measurements analyzed in this paper are early quality condition, performance assessment and total LCC(life cycle cost), which includes the initial cost, the costs of inspection, repair, and failure. Thus, a quantitative assessment model of resistance capacity was developed here to meet the requirement for deteriorated concrete structures. The model focuses on damage mechanisms of concrete structures deteriorated by initial damage factors for concrete quality and environment factors such as chloride and carbonation attacks. These results could provide useful LCC information for concrete structures interested in design, construction and maintenance.

        • 기존RC교량 바닥판의 유지관리를 위한 전문가 시스템 개발

          손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),이채규 ( Lee Chai-kyu ),손승현 ( Son Seung-hyun ),안영기 ( Ahn Young-ki ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2

          The purpose of this study makes a retrofit and rehabilitation practice trough the analysis and the improvement for the underlying problem of current retrofit and rehabilitation methods. Therefore, the deterioration process, the damage cause, the condition classification, the fatigue mechanism and the applied quantity of strengthening methods for RC deck slabs were analtzed. Artificial neural networks are efficient computing techniqures that are widely used to solve complex problems in many fields. In this study, a back-propagation neural network model for estimating a management on existing reinforced concrete bridge decks from damage cause, damage type, and integrity assessment at the initial stsge is need. The training and testing of the network were based on a database of 36. Four different network models werw used to study the ability of the neural network to predict the desirable output of increasing degree of accuracy. The neural networks is trained by modifying the weights of the neurons in response to the errors between the actual output values and the target output value. Training was done iteratively until the average sum squared errors over all the training patterms were minimized. This generally occurred after about 5,000 cycles of training.

        • 교량구조시스템의 유지관리를 위한 퍼지 신뢰성해석 모델

          김종길 ( Sohn¸ Yong-woo ),손용우 ( Lee¸ Cheung-bin ),이증빈 ( Lee¸ Chai-kyu ),이채규 ( Ahn¸ Young-ki ),안영기 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2

          This paper aims to propose a method that helps maintenance engineers to evaluate the damage states of bridge structure systems by using a Fuzzy Fault Tree Analysis. It may be stated that Fuzzy Fault Tree Analysis may be very useful for the systematic and rational fuzzy reliability assessment for real bridge structure systems problems because the approach is able to effectively deal with all the related bridge structural element damages in terms of the linguistic variables that incorporate systematically experts experiences and subjective judgement. This paper considers these uncertainties by providing a fuzzy reliability-based framework and shows that the identification of the optimum maintenance scenario is a straightforward process. This is achieved by using a computer program for LIFETIME. This program can consider the effects of various types of actions on the fuzzy reliability index profile of a deteriorating structures. Only the effect of maintenance interventions is considered in this study. However, any environmental or mechanical action affecting the fuzzy reliability index profile can be considered in LIFETIME. Numerical examples of deteriorating bridges are presented to illustrate the capability of the proposed approach. Further development and implementation of this approach are recommended for future research.

        • 성능평가를 고려한 철근콘크리트교의 경제성 분석

          김종길 ( Sohn Yong-woo ),손용우 ( Lee Cheung-bin ),이증빈 ( Lee Chai-kyu ),이채규 ( Ahn Young-ki ),안영기 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1

          Recently, the corrosion and aging of reinforced concrete bridges are of great concern inpracitice. The corroded reinforced bars in concrete influences not only the safety of the bridge structures, but olso the flexural strength of reinforced concrete members. The flexural strength charateristics and economic analysis of corroded rebars in concrete concidering performance evalution have not been well clarified yet. The purpose of the presnt study, therefore, to explore the resistance degradation function and life cycle costs for service life of reinforced concrete bridges according to the decrease of corrosion of steel bars. The present formula has been proposed to calculate the flexural strength decrease according to corrosion rate. The present study allows more accurate evalution of the residual capacity of partially reinforced concrete bridge beams under corrosion.

        • 교량구조물의 설계 및 유지관리단계 신뢰성기반 LCC분석 모델

          강형구 ( Kang Hyung-goo ),손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2

          Today, the economic evaluation is being widely used for the deterministic Life Cycle Cost (LCC) analysis method of bridge structures. Since it cannot incorporate the uncertainties, several studies have been carried out in oder to get over the incompleteness of the conventional LCC analysis method. A reliability-based life cycle cost analysis method, which can evaluate LCC analysis of existing bridge structures, has been recently proposed. Effectively maintaining bridge structures require predicting their physical and economical remaining lite using condition assessment and regression analysis using cost function viewpoint. Likewise, maintenance interventions and times models based on the reliability solution concept should be developed. Illustrative design examples of an actual reinforced concrete bridges and prestress concrete I type bridges were discussed to demonstrate the LCC effectiveness of the maintenance interventions of bridge structures, Based on the results of the numerical investigation, the LCC-effective maintenance strategy of bridge structures based on the proposed reliability-based LCC analysis models was found to lead to a more rational, economical, and safer maintenance strategy compared with the maintaining cost-optimum maintenance interventions and conventional code-based design.

        • 교량구조물의 설계 및 유지관리단계 신뢰성기반 LCC분석 모델

          강형구(Kang Hyung-Goo),손용우(Sohn Yong-Woo),이증빈(Lee Cheung-Bin),최미라(Choi Mi-Ra),박주원(Park Ju-Won) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2

          Today, the economic evaluation is being widely used for the deterministic Life Cycle Cost (LCC) analysis method of bridge structures. Since it cannot incorporate the uncertainties, several studies have been carried out in oder to get over the incompleteness of the conventional LCC analysis method. A reliability-based life cycle cost analysis method, which can evaluate LCC analysis of existing bridge structures, has been recently proposed. Effectively maintaining bridge structures require predicting their physical and economical remaining life using condition assessment and regression analysis using cost function viewpoint. Likewise, maintenance interventions and times models based on the reliability solution concept should be developed. Illustrative design examples of an actual reinforced concrete bridges and prestress concrete I type bridges were discussed to demonstrate the LCC effectiveness of the maintenance interventions of bridge structures, Based on the results of the numerical investigation, the LCC-effective maintenance strategy of bridge structures based on the proposed reliability-based LCC analysis models was found to lead to a more rational, economical, and safer maintenance strategy compared with the maintaining cost-optimum maintenance interventions and conventional code-based design.

        • 콘크리트구조물의 시간의존적 설계VE 및 LCC분석 모델

          강형구(Kang Hyung-Goo),손용우(Sohn Yong-Woo),이중빈(Lee Cheung-Bin),최미라(Choi Mi-Ra),박주원(Park Ju-won) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-

          In the resent years, the importance of VE (value engineering) and LCC (life cycle cost) analysis for concrete construction projects has been fully recognized Accordingly theoretical models, guidelines, and supporting software systems were developed for the value engineering and life cycle cost analysis for concrete construction including bridges and building systems. However the level of consensus on VE and LCC analysis resluts is still low due to the lack of reliable data on maintenance. This paper presents time dependent LCC model based value analysis method for rational investment decision making adn design altermative selection for construction of concrete structures. The proposed method incorporates a time dependent LCC model and a performance evaluation technique by fuzzy logic theory to properly handle the uncertainties associated with statistics data and to analyze the value of alternatives more rationally. The presented time dependent VE and LCC analysis procedure were applied to a real world project and this case study is discussed in the paper. The model and the procedure presented in this study can greatly contribute to design value engineering alternative selection, the estimation of the life cycle cost, and the allocation of budget for concrete construction projects.

        • KCI등재
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