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국내 중규모 업무용 건물의 녹색건축인증 등급별 추가공사 비용 영향에 관한 연구 - G-SEED 2016-2 기준으로(2018년 9월 1일 시행) -
이두환(Lee, Du-Hwan),김재문(Kim, Jae-Moon) 대한건축학회 2019 大韓建築學會論文集 : 構造系 Vol.35 No.10
The purpose of this paper is to analyze the additional construction cost of G-SEED certification for domestic office building reflecting the latest standard(G-SEED 2016-2), and to derive cost impact by category and level. Therefore, it is intended to provide quantitave cost data according to G-SEED certification at the planning phase of the project, estimate the additional construction cost per level according to G-SEED Certification of similar project to be carried out in the future, and encourage G-SEED certification by supporting the decision of the owners. Method: The Process and method of this study are summarized in five steps, 1) Review of previous research, 2) Selection of target project, 3) Scenario setting by level, 4) Additional construction cost for each evaluation category, 5) Extraction of additional construction cost ratio by level. Result: This paper analyzed the cost impact by deriving the additional construction cost of detailed category for level improvement according to the revised G-SEED certification(G-SEED 2016-2). In conclusion, an additional construction cost(ratio) of G-SEED projects to the reference building is drawn as good level; 157,426,241 KWN(+0.43%), very good level; 321,907,802 KWN(+0.88%), excellent level; 999,371,478 KWN(+2.74%), and outstanding level; 1,467,047,718 KWN(+4.02%).
국내 소규모 건축물의 하자 예방을 위한 시방서 개발방향에 관한 연구
이두환(Lee, Du-Hwan),김재문(Kim, Jae-Moon),전완표(Jeon, Wan-Pyo),남승훈(Nam, Seung-Hoon) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.4
In this study, the development direction of specification specialized for small-sized buildings was proposed to develop measures to prevent defects and improve quality of small-sized buildings that are being built or remodeled. This is in accordance with the continuously increasing trend of small-sized buildings in the construction market. Canadian specifications used for large-sized buildings and small-sized building were chosen for comparative analysis, since its components are most similar to those in Korea. The features of small-sized building specifications were derived based on the construction classification and specification code contents. Additional improvement was proposed using the ‘General requirements for small-sized buildings (in Korea)’ as an outline. And the series of processes and results were synthesized and the ‘Application plan of domestic small-sized building specifications’ was prepared. In addition, the relevant literature was investigated and linked to reflect the visualization of specifications, and the ‘Development direction of small-sized building guide specification’ was established by compiling these results.
고주파열처리에 의한 자동차용 고강도강판의 기계적 성질변화
이두환 ( Lee Du Hwan ),윤치상 ( Yun Chi Sang ),임종대 ( Im Jong Dae ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.2
N/A The efforts which increase the strength of the auto-body structure and decrease its weight lead to develop a new concept of part production systems, such as Post-Form Strengthening by induction heat treatment. In this study, several cold and hot-rolled sheet steels were used to find out optimum induction heat treatment conditions. After induction heat treatment, strength of heat-treated sheet steels was increased significantly compared with that of as-rolled steels. From these results, auto-body structure which has more light and safe has been made by using this induction hardening method.
WELL Building Standard 적용 기존 건축물 그린리모델링의 건강성능 평가
이두환(Du Hwan Lee),김영일(Young Il Kim),김선혜(Sean Hay Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
In this study, the WELL Building Standard was used to derive the Features for the evaluation of health performance of existing buildings, and to examine changes in health performance before and after improvement of green remodeling. As a result, the total score of each Feature that reflects the weight was 17.75 points, the total score before improvement of green remodeling was 8.19 points, and the score after improvement of green remodeling was 11.13 points. Among the 23 Features that can be evaluated from the WELL Building Standard, 11 Features improved health improvement by 16.6% after improvement of green remodeling. Improvement of indoor ventilation(Feature 3), removal of asbestos(Feature 6), installation of automated shading(Feature 16, Feature 20), and replacement of energy efficient equipments for HVAC(Feature 24) have been shown to improve health performance.
예조건화된 Navier-Stokes 방정식에서의 풍상차분법의 수치특성
길재흥,이두환,손덕영,최윤호,권장혁,이승수,Gill, Jae-Heung,Lee, Du-Hwan,Sohn, Duk-Young,Choi, Yun-Ho,Kwon, Jang-Hyuk,Lee, Seung-Soo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
Numerical characteristics of implicit upwind schemes, such as upwind ADI, line Gauss-Seidel (LGS) and point Gauss-Seidel (LU) algorithms, for Navier-Stokes equations have been investigated. Time-derivative preconditioning method was applied for efficient convergence at low Mach/Reynolds number regime as well as at large grid aspect ratios. All the algorithms were expressed in approximate factorization form and von Neumann stability analysis was performed to identify stability characteristics of the above algorithms in the presence of high grid aspect ratios. Stability analysis showed that for high aspect ratio computations, the ADI and LGS algorithms showed efficient damping effect up to moderate aspect ratio if we adopt viscous preconditioning based on min-CFL/max-VNN time-step definition. The LU algorithm, on the other hand, showed serious deterioration in stability characteristics as the grid aspect ratio increases. Computations for several practical applications also verified these results.
항전 비행운용프로그램 검증을 위한 단일 PC 기반 소프트웨어 시험환경 SW 설계
차상철(Sang-Cheol Cha),이두환(Du-Hwan Lee),김정열(Jeong-Yeol Kim) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.11
항공전자 비행운용프로그램은 임무컴퓨터에서 실행되면서 각종 항전장비와의 연동을 통해 운용된다. 비행운용프로그램을 검증하기 위해서는 임무컴퓨터와 연동하는 실장비가 탑재된 SIL 또는 STE가 필수적이나 일반적으로 특정 항공기 체계개발 시 사용되는 SIL은 OEP 개발 일정과 상당 부분 중첩되므로 OFP 개발과정 후반부 또는 SW 통합 시점에 SIL이 개발자에게 제공되며 개발과정 중 개발자가 SW를 검증하기 위한 도구가 제공되지 않는 경우가 많다. 대부분의 경우 SIL은 한 세트만 제작하기 때문에 다수의 개발자가 하나의 SIL을 이용해서 SW 검증을 해야 하므로 시험단계에서 병목현상이 발생하 수밖에 없어 개발 일정 준수에 위험요소로 작용한다. 본 논문에서는 실장비가 탑재된 SIL 또는 STE 대신 개발자 PC와 임무컴퓨터만을 이용하여 OFP 기능을 검증할 수 있는 STE SW 설계에 대해 기술한다. Avionics OFP runs on the mission computer and can be operated by interacting with several avionics equipments. In order to verify OFP SW, SIL having real avionics equipments or models is absolutely necessary. Therefore in many cases SIL is implemented concurrently with OFP developing, and only one SIL is provided to developers. So developers sometimes need an alternative to SIL for verifying requirements in the middle of development process. In this paper, we propose a single PC based STE SW that simulates interworking equipments and verifies OFP in a single PC environment without actual interworking equipments or SIL HW interfaces.