• The Korean Journal of Rheology
• /
• v.3 no.2
• /
• pp.166-174
• /
• 1991

동일화학종이면서 \ulcorner량이 다른 두 단분산 고분자를 혼합한 2성분 다분산 농축계에 equivalent primitive chain model을 적용하여 사슬주위의 제약완화에 따른 관의 재형성 효 과를 각 사슬의 특성완화시간으로 산정하여 나타내었다. Polystyrene 시료에 대하여 동력하 적 실험을 실시한 결과를 이용하여 사동모델에 따른 각 사슬의 최장완화시간은 복소수 점도 의 허수분분(η＂)대 주파수($\omega$)의 관계, 관의 재형성 시간은 $\omega$ 변화에 따른 storage modulus(G＇) 로부터 각각 도출하였다. 이러한 작업을 통하여 특성완화 시간들이 분자량 및 각 성분 농도에의 의존성을 더욱 상세히 파악할 수 있었다.

• Land and Housing Review
• /
• v.3 no.2
• /
• pp.195-202
• /
• 2012

This paper summarizes the seismic performance of two shear walls with different reinforcement details in boundary elements. One is a special shear wall designed by KBC2009 and the other is a shear wall with improved reinforcement details in boundary elements, which is a newly proposed type of special shear wall. Experimental tests under cyclic reversed loading were carried out with two 2/3 scale shear walls which were modelled from the lower part of seismic-resisting shear wall in 22-stories wall-slab apartment building. The experimental results show that seismic performance of shear wall with improved reinforcement details was almost similar to that of special shear wall with respect to the moment-drift ratio. However, energy dissipation capacity and ductility were slightly different. Also, shear wall with improved reinforcement details in boundary elements satisfied the inter-story drift limit of 1.5% from KBC2009.

• Land and Housing Review
• /
• v.6 no.1
• /
• pp.11-19
• /
• 2015

This paper presents experimental results on detailing of boundary element transverse reinforcement, proposed to alleviate placement detailing of special shear wall experiencing difficulty in construction at the sites due to recently reinforced seismic regulations, according to the type and placement interval of transverse reinforcement. As a result of experiment, crack and destruction aspects of SSWR series specimen that employed the proposed detailing of transverse reinforcement showed similar trend as SSW series specimen that used closed hoop. Predicted maximum strength values were exceeded. Also as a result of comparing energy dissipation ability, SSWR2 specimen that follows alleviated placement detailing was found to have similar seismic performance as special shear wall SSW2 specimen based on the existing design standard. As it satisfies the deformation angle condition of 1.5% provided in the design standard, SSWR2 can be used as the main lateral force resistance element in structures.

• Bulletin of Food Technology
• /
• v.20 no.1
• /
• pp.215-223
• /
• 2007

현대는 누구나 다소 스트레스의 영향 아래 생활하고 있다. 이와 같은 스트레스가 인체에 미치는 영향에 대해서는 최근 상세히 조사.연구되어 불면이나 우울증 등 여러 가지 질병을 일으킨다는 것이 보고되어 있다. 이 중 식품분야에서는 항스트레스 대책의 일환으로서 뇌.신경계에 작용하여 스트레스 완화효과를 기대할 수 있는 GABA나 PS, 아데닌과 같은 기능성소재가 제안되고 있다. 본문에서는 항스트레스를 컨셉트로 한 상품 및 소재의 연구.개발상황에 대해 살펴보고자 하였다.

• Journal of the Korean Society of Hazard Mitigation
• /
• v.9 no.1
• /
• pp.41-47
• /
• 2009

Transverse rib web of orthotropic steel decks is highly susceptible to stress concentration due to out-of-plane and oil canning deformation caused by longitudinal rib distortion. In particular, stress concentrations are observed in the crossing point of longitudinal rib-transverse rib-deck plate, and cutout parts of transverse rib. The main objective of this study is to improve structure performance and to reduce the stress concentration of aforementioned susceptible parts. It is known that the installation of diaphragm alleviates stress concentrations between crossing point ant cutout. The influence of transverse rib placement and cutout width on stress concentrations was thoroughly investigated through numerical analyses. The numerical result showed that diaphragms produce the structural details for improved structure performance, when the transverse rib was placed in the same location with diaphragms. In any case, it is certain that the installation of diaphragms has more advantageous than the case without diaphragms in terms of structure performance of orthotropic steel decks. In this study, the distance ratio($y_i/y_{total}$) is defined as the ratio of the distance($y_{total}$) between the deck plate and longitudinal rib bottom to the distance($y_i$) between the deck plate and crossing point of longitudinal rib-transverse rib in cutout part. It has been found that the optimal distance ratio was 0.85 from the numerical simulation.

• Journal of Korean Society of Steel Construction
• /
• v.25 no.5
• /
• pp.451-461
• /
• 2013

In steel bridges, there are several details that constrain the deformation such as buckling by external forces. Most of these details which are composed of the intersection members have scallops in order to exclude the weld defects inherently and to get the ease of fabrication and also to decrease the stress concentration. In this study, stress relief hole (SRH) near stress concentration zone with detail category D or under is proposed as a method to improve the resistance on the fatigue crack initiation to detail category C. And the effects of the appropriate size and location of SRH were examined and the applicability to improve the fatigue resistance of the floorbeam web and the rib wall at rib/floorbeam intersection in the orthotropic steel deck bridge was evaluated.

• The Journal of the Korea Contents Association
• /
• v.9 no.10
• /
• pp.110-121
• /
• 2009

In this paper, we propose the new method that offer detailed-information through relax the system memory limitation about 3D model to user. That method based on making LOD(Level of Detail) model from huge 3D data of structure cultural assets. In our method as transformed AOSP algorithm, first of all it create the hierarchical structure space about 3D data, and create the LOD model by surface simplification. Then it extract the ROI(Region of Interest) of user in simplified LOD model, and then do rendering by original model and same surface detailed-information after process the local detailed in extracted region. To evaluate the proposed method, we have some experiment by using the precise 3D scan data of structure cultural assets. Our method can offer the detailed-information same as exist method, and moreover 45% reduced consumption of memory experimentally by forming mesh structure same as ROI of simplified LOD model. So we can check the huge structure cultural assets particularly in general computer environment.

• Proceedings of the KOR-KST Conference
• /
• 1998.10b
• /
• pp.506-506
• /
• 1998

지능형 교통시스템(ITS: Intelligent Transport Systems)의 부체계인 첨단화물운송시스템(CVOs: Commercial Vehicle Operations)은 교통혼잡 완화와 물류비 목적으로 종합물류정보전산망 사업에서도 추진되어 왔다. ITS 기본계획에서 정의한 화물 및 화물차량관리시스템과 위험물 차량관리시스템의 세부서비스는 '97년말 종합물류정보전산망 상세설계와 첨단화물운송시스템 기본설계 과정에서 새롭게 정립, 제시되었다. 본 고에서는 첨단화물운송시스템의 서비스와 소요기술 개발현황을 기존의 지능형 교통시스템과 종합물류정보망의 추진계획, 업계의 관련자료를 바탕으로 비교적 상세하게 검토하고, 현재까지 공공과 민간에서 개발, 적용되고 있는 시범서비스 차원의 첨단화물운송시스템의 소요기술 적용사례와 효과를 분석하고자 하였다. 본 고에서 첨단화물운송시스템의 적용사례로서 해양수산부를 중심으로 현재 구축 운영중인 컨테이너터미널 전자문서교환(EDI: Electronic Data Interchange) 및 GATE 자동화시스템과 '97년 7월부터 본격 가동에 들어간 현대물류 택배종합전산시스템(HYDEX)의 정보서비스와 관련한 요소기술과 함께 그 효과를 살펴보고, '96년 12월부터 시범서비스를 제공중인 한국통신의 화물운송정보시스템의 적용효과를 분석하였다.

• Journal of the Korea Concrete Institute
• /
• v.25 no.3
• /
• pp.271-281
• /
• 2013

The current seismic design code prescribes that a structural wall should be designed as a special shear wall when the building height is more than 60 m and its seismic design category is classified as D. However, the use of a special shear wall has a negative effect on constructability and economic efficiency. In the present study, the seismic performance of a special shear wall and a special shear wall with relaxed reinforcement detail was evaluated through a cyclic reversal loading test. The specimens were constructed to measure the results of the experimental variable regarding the reinforcement details of the special boundary element. Next, the seismic performances of a special shear wall structural system and that of a special shear wall structural system with relaxed reinforcement detail was evaluated by methods proposed in the FEMA P695. The cyclic reversal loading test results of this study showed that the performance of the shear wall with relaxed reinforcement detail was almost similar to the performance of a special shear wall and has the performance which requested from standard. The results of the seismic evaluation showed that all special shear walls with relaxed reinforcement detail are satisfied with the design code and seismic performance.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1998.05a
• /
• pp.771-776
• /
• 1998

울진 원전 3,4 호기를 대상으로 MAAP4.0.2 코드를 이용하여 발전소 정전사고를 모의/분석했다. 본 분석에서는 사고진행에 따른 일.이차계통의 상태변화를 원자로용기 파손때까지 상세 파악하였다. 사고관리 관점에서, 발전소 정전사고는 이차측의 대기방출밸브를 통한 강제감압에 의해 사고진행을 완화할 수 있으며 이러한 운전원 조치에 의한 완화효과를 검토하였다 그 결과 감압시작 2시간후에 일차측은 약 24$^{\circ}C$ 의 과냉각도를 보이며 안정되었고. 사고시작 1시간 후부터 3시간 동안의 강제감압이 성공한 경우, 노심노출시간 기준으로 약 2시간의 지면효과가 있었다.