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동적 변위민감도 해석을 이용한 고층 RC 골조구조물의 정량적인 횡변위 제어 방안
이한주,김호수 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.3
본 연구에서는 지진하중을 받는 고층 RC 골조구조물의 횡변위를 정량적으로 제어할 수 있는 방안을 제시한다. 이를 위해 수학적인 일반성을 가지면서 큰 규모의 문제도 효율적으로 다룰 수 있는 근사화 개념을 도입하여 횡변위 구속조건식을 설정한다. 아울러 구조부재의 단면특성 관계식을 설정함으로써 설계변수의 수를 줄여주고, 초기에 주어진 단면형상이 최적설계 과정동안 계속 유지된다는 가정을 이용하여 최적설계결과에서 구해진 단면특성에 따라 부재단면크기를 산출하는 방안을 강구한다. 특히 근사화된 횡변위구속조건식을 정식화 하기 위해 동적 변위민감도해석 방안이 고려된다. 이와 같이 제시된 동적 강성최적설계 기법의 효용성을 검토하기 위해 10층과 50층 규모의 삼차원 RC 골조구조물 모델이 고려된다. This study presents a technique to control quantitatively lateral drift of RC tall frameworks subject to lateral loads. To this end, lateral drift constraints are established by introducing approximation concept that preserves the generality of the mathematical programming and can efficiently solve large scale problems. Also the relationships of sectional properties are established to reduce the number of design variables and resizing technique of member is developed under the 'constant-shape' assumption. Specifically, the methodology of dynamic displacement sensitivity analysis is developed to formulate the approximated lateral displacement constraints. Three types of 10 and 50 story RC framework models are considered to illustrate the features of dynamic stiffness-based optimal design technique proposed in this study.
이한주,양승연 한국무용교육학회 2022 韓國舞踊敎育學會誌 Vol.33 No.1
The purpose of this study is to examine the curriculum of Korean dance departments using word cloud techniques. Following 15 universities and 17 departments were finally selected by collecting department information provided by the admission information portal ‘adiga’, 428 subjects were visually compared and analyzed. It indicated that the frequency of dance practice-related words was higher than that of theory. Next, in the process of establishing or changing the name of a new department, the boundary between pure arts and practical arts is reflected in the curriculum, with the region at the center. To fit into the cultural era, dance studies should play a role as an independent study in realizing common interests and social values such as preservation of cultural heritage, culture and arts education, and revitalization of the local communities.
고강도 강섬유보강콘크리트를 적용한 프리캐스트 바닥판 이음부의 구조성능 평가
이한주,정철헌,신동호,박세진,김인규,Lee, Han-Joo,Chung, Chul-Hun,Shin, Dong-Ho,Park, Se-Jin,Kim, In-Gyu 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.6
프리캐스트 바닥판 공법은 바닥판간 이음부가 존재하며, 이음부의 연결성능에 따라 전체 교량 구조물의 성능이 좌우되므로 이음부의 연결성능 확보가 중요한 요소이다. 본 연구에서는 고강도 강섬유보강콘크리트(High Strength Fiber Reinforced Concrete, HSFRC)가 적용된 비대칭 요철형 이음단면을 갖는 연결형식을 제안하였으며, 이음부의 단면형태, 철근 겹침이음길이 및 겹침이음 형식에 따른 구조실험을 수행하여 제안된 연결형식의 휨 성능을 평가하였다. 실험결과, 이음부 상세에 관계없이 이음철근은 항복변형률 수준의 인장변형을 나타내었으며, 제안된 연결형식은 충분한 휨 저항성능을 확보하는 것으로 나타났다. 이러한 실험결과는, 현행 도로교설계기준의 최소 겹침이음길이에 대한 규정은 이음부 채움재로 HSFRC를 적용한 프리캐스트 바닥판 이음부에서는 보수적인 규정임을 알 수 있다. 따라서 이음부 채움재로 HSFRC를 사용함에 의해 철근 겹침이음 상세의 단순화 및 이음부 폭의 감소가 가능하며, 제안된 연결형식은 프리캐스트 바닥판 이음부에 효과적으로 적용 가능할 것으로 판단된다. In precast deck system, structural performance and serviceability are mostly determined by the connection methods between the precast decks. This study proposes precast deck system with asymmetric ribbed connection details using High Strength Fiber Reinforced Concrete(HSFRC) with filler. To verify the proposed method, the flexural performance experiment was carried out with variation of joint cross section type and splice rebar details. From the test results, regardless of joint details, spliced tensile rebars of specimens were deformed to yielding strain level. Also, all types of specimens resulted in sufficient flexural performance. These test results show that the minimum lap splice length specified in current Korea Highway Bridge Design Code is conservative for precast deck joint using HSFRC. Therefore, splice details can be simplified and joint width can be reduced by using HSFRC with filler between the precast decks, and the proposed precast deck systems can be applied to the connection part of precast decks effectively.
이한주 대한간학회 2014 춘·추계 학술대회 (KASL) Vol.2014 No.2
Currently, surveillance for hepatocellular carcinoma (HCC) has been widely applied in patients with chronic HBV infection due to the high incidence of HCC. An important issue related with a surveillance program is cost- effectiveness. According to several cost-effectiveness models, surveillance became cost-effective when the risk of HCC is 1.5%/year or greater in patients with cirrhosis, and 0.2%/year or greater in hepatitis B carriers without cirrhosis. However, the threshold cost for surveillance (<$50,000/year of life gained) is not applicable in most Asian countries, and should be determined depending on the economic situation of each country. As a matter of course, the efficacy of surveillance unambiguously depends on the incidence of HCC in the target population. Recently, several prediction scores have been developed and validated to calculate the risk of HCC in patients with chronic HBV infection in the community and clinic settings. These prediction scores have several advantages and disadvantages, so should be carefully applied in appropriate clinical settings. In general, they can accurately stratify the risk of HCC in patients with chronic HBV infection and be used to determine the target population for surveillance, but developing a new prediction score for Korean patients is mandatory.