• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
• /
• pp.331-332
• /
• 2012

Structural steel has been used as a primary materials to columns and beams since 1960's in Korea with an advantages of excellent of load-bearing capacity and design flexibility, and faster construction. However, if the steel columns made of structural steel exposed to fire the load-bearing capacity is going down steadily and finally reach to collapse. Therefore, building regulation requires fire resistance according to building occupation, scales. The fire resistance can be evaluated two categories. One is prescriptive method that is based on building regulation, specification and so on and the other is performance-based fire engineering method. The latter can be designed based on scientific and engineering consequences. The easiest evaluation way using the fire engineering design is comparing to the limiting temperature and maximum temperature calculated based on heat transfer theory. If the limiting temperature of a column exceeds the maximum temperature of it, the column can carry the load during the fire. Therefore, the database of limiting temperature is very essential for evaluation of column. In this paper, to build the database of column made of rectangular hollow sections 8 fire tests with loading were conducted and the relation between the limiting temperature and the applied loads showed in reverse proportion.

• 한국구조물진단유지관리공학회 논문집
• /
• 제6권2호
• /
• pp.233-244
• /
• 2002

The purposes of this research are to use the buildings efficiently and long, save energies, make the cozy and comfortable environment of residential and living spaces, rearrange the related acts for easy implementation of remodeling, and activate the government's support programs so as to make remodeling activated in a safe mode. The scope and methodology of this research include the review of existing literatures and data on remodeling, census on apartment residents, influence factors, and the development of methods for activation of building remodeling and strengthening of safety management, like activation measures, licensing and ordering regulation updates, etc regarding the remodeling. Safety inspection and in-depth inspection before and after remodeling should be regulated. The construction materials for remodeling should be light weighted and the construction methods which can minimize the impact and vibration during construction should be selected. The improvement of regulation on the remodeling contractor qualification and order method should be updated. If the remodeling is activated and safety management is reinforced by the suggested measures, solving of lack of house, prevention of abuse of resources, and improvement of residential environment could be accomplished rationally.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
• /
• pp.421-424
• /
• 2006

This study, in order for perceiving the mechanical attribute followed by the explosive spalling of high strength concrete material under high temperature and evaluating capacity of endurance of material, targets understanding capacity of endurance of material such as explosive spalling in high temperature, temperature by thickness of clothing, transformation extent, transformation speed and displacement, stocking the maximum load based on the Allowable Stress Design Method. As a result of experimenting the explosive spalling attribute of high strength concrete material, the one possibly causing serious damage is the 50 MPa concrete. In all aspects of 60 MPa concrete, explosive spalling happens. Especially, it is hazardous enough to reveal all the iron bar. All explosive spalling is intensively concentrated on the surface of concrete for the first $5{\sim}25$ minutes, which urges for the explosive spalling protection action. As a result of evaluating the structural safety by the transformation of high strength concrete, while beam assures the fire safety meeting regulation, 60 MPa shows the dramatic increase of transformation, which only counts 84% of safety. In a column, both the concrete exclusion and excessive explosive spalling are concentrated upper part of column, which brings about the dramatic transformation, so it only meets the 50% of safety regulation. Likewise, in 80, 100 MPa concrete which was never experimented considering the condition of domestic structural endurance stocking devices, the faster collapse is expected.

• 한국보육지원학회지
• /
• 제11권4호
• /
• pp.1-17
• /
• 2015

본 연구는 유아의 또래 상호작용과 자기조절, 리더십 간의 관계를 밝히고, 또래와의 상호작용이 유아의 리더십에 미치는 영향에서 자기조절의 매개효과를 알아보는 데 목적이 있다. 연구 대상은 서울, 경인 지역의 유아교육기관에 재원 중인 만 4-5세 유아 211명이었고 유치원과 어린이집 근무한 교사 대상으로 질문지를 조사 실시하여 수집된 자료 분석 하였다. 분석은 SPSS 21 프로그램을 이용하여 평균, 표준편차, 왜도, 첨도, 상관분석을 실시하였고 Amos 21 프로그램을 이용하여 구조방정식모형을 검증하여 다음 결과를 얻었다. 첫째, 유아의 긍정적 또래상호작용, 자기조절, 리더십 간에는 유의한 정적 상관관계가 나타났다. 둘째, 또래상호작용은 유아 리더십에 유의한 영향을 미치지 않았고, 자기조절은 유아 리더십에 긍정적인 효과가 있었다. 또래상호작용은 유아 자기조절에 긍정적인 영향을 미치며 또래상호작용이 유아 리더십에 미치는 영향 관계에서 자기조절은 유의한 매개효과 역할을 하는 것으로 나타났다. 이러한 결과는 유아의 리더십 교육에 있어 주목해야 할 요소로서 유아의 또래 상호작용과 자기조절의 중요성을 시사한다.

• 대한조선학회논문집
• /
• 제52권2호
• /
• pp.161-169
• /
• 2015

According to SOLAS Regulation XII/6.5.3 and IMO GBS functional requirement(IMO, 2010), the structural redundancy of multi-bay stiffened panel in cargo area of bulk carrier should be provided enough in order to endure the initial design load though one bay of the stiffened panel is damaged due to plastic deformation or fatigue crack. To satisfy structural redundancy, Harmonized Common Structural Rules (hereinafter CSR-H, IACS, 2014) proposed to use 1.15 instead of 1.0 for buckling usage factor of stiffened panel in cargo area. This paper shows that buckling usage factor in CSR-H for structural redundancy is somewhat conservative considering the ultimate strength calculated by using nonlinear FEA for the damaged condition which is only one bay's plastic deformation due to colliding by weigh object like a bucket. Also, this paper presents that increasing of plate thickness only is more effective to get enough structural redundancy.

• 한국심리학회지 : 코칭
• /
• 제7권3호
• /
• pp.81-107
• /
• 2023

본 연구는 중년기 성인의 심리적 안녕감에 영향을 미치는 심리적 요인을 확인하는데 그 목적이 있었다. 특히 중년기 성인의 불안정 성인애착(불안애착, 회피애착)과 심리적 안녕감 간의 관계에서 자신의 내적 경험을 명료화할 수 있는 능력인 정신화와 적응적 인지적 정서조절능력이 이중 매개효과를 가지는지를 확인하고자 하였다. 연구문제를 규명하기 위해 모바일과 오프라인을 통해 자발적으로 참여한 중년기 성인 317명(남자 117명, 여자 200명)의 설문 응답 자료를 Jamovi 2.2.5 통계프로그램을 이용하여 구조방정식 모형 분석을 실시하였다. 연구결과는 첫째, 구조방정식 모델에서 중년기 성인의 불안정 성인애착(불안애착, 회피애착)과 심리적 안녕감의 관계에서 정신화의 단순 매개효과는 모두 유의하지 않았다. 둘째, 중년기의 불안정 성인애착과 심리적 안녕감의 관계에서 적응적 인지적 정서조절의 단순 매개효과는 불안애착에서만 유의미하였다. 셋째, 중년기의 불안정 성인애착과 심리적 안녕감의 관계에서 불안애착은 정신화와 적응적 인지적 정서조절을 통한 완전 이중매개효과를 보였으나, 회피애착은 부분 이중매개효과를 보였다. 이러한 결과는 그 범위가 점차 확대되고 있는 중년기 성인의 심리적 안녕감을 높일 수 있는 프로그램을 개발하기 위한 이론적 틀을 제공하는 데 도움을 줄 것으로 기대된다.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2000년도 봄 학술발표회논문집
• /
• pp.222-229
• /
• 2000

Malty bridges are severely damaged by the overloaded heavy vehicle and tile trend will become more serious because the traffic volume is continuously increasing. Currently, the vehicles with gross weights over 40 tons or axle weight over 10 tons are not allowed on the public road. However, this regulation is not based on a systemetic study on the bridge capacityand assumed to be much too conservative depending on the vehicle types ans bridge types. In this study, the permit weights of heavy vehicles of diverse axle spacings and axle load distribution are calculated considering the structural characteristics of bridge superstructures. In order to consider the various load effects of heavy weight vehicle crossings, three conditions are considered in the calculation of permit vehicle load. From the results, the permit vehicle weights of bridges are calculated and simplified formulas which can be used in the case when only the vehicle dimension are known are presented.

• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회 1997년도 추계학술대회발표논문집; 홍익대학교, 서울; 1 Nov. 1997
• /
• pp.207-210
• /
• 1997

The drastic structural changes in telecommunications industry are imposing new strains on operators, regulators and customers. Many researchers have offered diverse frameworks for the changes from the perspectives of sociology, technology, and/or economics. However, there have been few attempts to document the competitive phenomena from management perspectives because of the technological complexities and dynamism in the fundamental transition of competition. In this study, we examine competitive environment in telecommunications industry, and identified five structural elements; telecom operator, competitors, regulation, suppliers, and customer demand. The suggested framework is used to provide a basis for explaining the changes in the characteristics of individual elements and the interactions among them. The dynamic industry-specific changes will be explained through an evolutionary model. We specify the characteristics of progressive stages and the determinants of the evolution. Changes are reviewed in terms of five criteria; regulations and competitions, value chain, technology, customers demand, and internal operations. The result of this study will be useful in analyzing and predicting industry structure and major participants' strategic behaviors and decision patterns. This study can alse be extended to other industries facing dynamic structural changes.

• Structural Engineering and Mechanics
• /
• 제53권5호
• /
• pp.1031-1049
• /
• 2015

This paper highlights the role of innovative vibration control system based on two promising properties in a parallel configuration. Hybrid device consists of two main components; recentering wires of shape memory alloy (SMA) and steel pipe section as an energy dissipater element. This approach concentrates damage in the steel pipe and prevents the main structural members from yielding. By regulation of the main adjustable design parameter, an optimum performance of the device is obtained. The effectiveness of the device in passive control of structures is evaluated through nonlinear time history analyses of a five-story steel frame with and without the hybrid device. Comparing the results proves that the hybrid device has a considerable potential to mitigate the residual drift ratio, peak absolute acceleration and peak interstory drift of the structure.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
• /
• pp.331-334
• /
• 2003

Since regulation or specification for the reinforcing method are quite ambiguous, structural design for the reinforcement can be subjectively and arbitrarily conducted. Thus, reasonable limitation and guide for the quantity of the reinforcement are required for the safe use of the structure after repair. In order to guarantee the safety of the structural member several items should be considered; reinforcing limit to avoid the brittle failure, least required strength of the existing member before reinforcement in order not to fail under the new serviceability load condition when reinforcing steel plates or CFRP sheets are harmed or subjected to fire.