생태교육적 가치평가를 위한 습지생태공원 적지분석

변형균 ( Byun Hyung-kyun ),이정원 ( Lee Jung-won ),이동근 ( Lee Dong-kun ) 한국경관학회 2014 한국경관학회지 Vol.6 No.1

본 연구는 국가습지센터 습지 리스트 중 내륙 습지 12개소를 대상으로 생태교육을 위한 가장 적합한 장소를 찾는 연구를 하였다. 연구방법은 적지분석을 위한 인자를 도출하여 데이터 수집을 한 후 AHP 기법을 사용하여 인자별 가중치를 설정하였으며, GIS Reclassify를 사용하여 각 인자별 가중치에 대한 분위(Quantile) 분류를 3등급으로 재등급화 하여 1, 2, 3점으로 점수를 부여하였고, 마지막으로 GIS 중첩을 하여 최적의 장소를 찾아내었다. 연구 결과, 우포늪이 1순위를 차지하였으며, 고창운곡습지, 무제치늪, 대암산용늪, 담양습지, 두웅습지, 신불산고산습지, 강화매화마름 군락지, 화엄늪, 한반도습지, 밀양재약산 사자평고산습지 순으로 나타났으며, 상주공검지가 가장 낮은 순위로 분석되었다. 생태교육을 위한 적지분석을 통하여 향후 습지생태공원에서 생태교육의 활성화와 개선점을 기대할 수 있다. The purpose of this project/study aims to find the most appropriate place for ecological education among 12 inland Wetlands of National Wetlands Center wetland lists. The study was conducted through following process: researchers collected data by deriving factors for suitable site analysis, set weights of the factors through using AHP method, then reclassified Quantile category into 3 ratings depending on their importance of each factor using GIS Reclassify, and found the most appropriate place by using GIS overlay. The results of the research shows that Upo Wetland(우포늪) ranked the first place, followed by Ungok Wetland(고창운곡습지), Moojechineup(무제치늪), Yongneup of Mt. Daeam(대암산용늪), 담양습지, Du-ung Wetland(두웅습지), Alpine Wetland of Mt. Sinbul(신불산고산습지), Ganghwa Maehwamarum Habitat(강화매화마름군락지), Hwaeumneu(화엄늪), Hanbando Wetland(한반도습지), Sajapyeong Alpine Wetland of Mt. Jaeyak(밀양재약산 사자평고산습지). Sangju Gonggeumji(상주공검지) was ranked the lowest place. In conclusion, the results of this study expect the improvement and vitalization of the ecological education in Wetland Eco Park in the future through suitable site analysis for ecological education.

KHP 총소유비용의 민감도 분석 사례 연구

변형균(Hyung-Kyun Byun),이상우(Sang-Woo Lee),권문원(Moon-Won Kwon),김주균(Joo-Kyun Kim),최영환(Young-Hwan Choi) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.2

KHP project sets total ownership cost as the target cost by applying CAIV and administrates total ownership cost through compromise analysis, a periodical estimate and management of design alternatives for each development. Based on expected cost results, sensibility of total ownership cost is analyzed complying with the change of reliability, availability, maintainability and other related factors. By considering potential total ownership cost saving methods, first of all, this paper identifies total ownership cost changing effects for each related factor, secondly, suggests total ownership cost and maintenance and operating cost saving methods via finding components that affect total ownership cost and lastly, suggests total ownership cost saving directions that may be applied to other projects in the future.

수리온헬기 개발사업에서 시스템 엔지니어링 및 사업성과관리 기법 적용 사례연구

변형균,이상우,Byun, Hyung Kyun,Lee, Sang Woo 한국시스템엔지니어링학회 2012 시스템엔지니어링학술지 Vol.8 No.1

The System Engineering(SE) and the Earned Value Management System(EVMS), as parts of the scientific project management methodology, have been applied to Surion Helicopter R&D Program. The concept and application process of SE methodology, requirements management and applications output by DOORS program are described in this study. The concept and application process of EVMS, analysis results of schedule/cost variance for Surion RF equipment are also discussed in this study. Though the Surion R&D program is still on-going, it is found that the measures of effectiveness of SE and EVMS applications are verified.

수중 모터펌프 베어링 유닛 열전달 해석

윤정의(Jeong-Eui Yun),변형균(Hyung-Kyun Byun) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.4

The purpose of this paper is to find a proper cooling system of bearing unit in the submersible motor pump to extend a life time. To do this, heat transfer analysis of the submersible motor pump were performed using commercial CFD code ANSYS. In order to obtain the resonable heat transfer simulation results, we first set up mathematical model of heat source in the bearing system, and carried out heat transfer analysis with the model. As a results, new type bearing cap which had several ribs for cooling the bearing was proposed. Finally, through the comparison between experimental results of old and new model pump, we proofed that maximum bearing temperature of new model was about 10% lower than that of old model.

수중 모터펌프 베어링 유닛 열전달 해석

윤정의(MJeong-Eui Yun),변형균(Hyung-Kyun Byun) 한국트라이볼로지학회 2010 한국트라이볼로지학회 학술대회 Vol.2010 No.11

강섬유 보강 콘크리트의 휨 피로거동

류종현(Ryu, Jong-Hyun),박홍용(Park, Hong-Yong),변형균(Byun, Hyung-Kyun) 한국콘크리트학회 2007 한국콘크리트학회 학술대회 논문집 Vol.2007 No.5

합성형 사장교 시공오차 제어시스템

장승필(Sung Pil Chang),조서경(Seo Kyung Cho),김제춘(Je Choon Kim),변형균(Hyung Kyun Byun) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.2

This paper presents a construction error control system to improve the construction accuracy of composite cable stayed bridges constructed by the free cantilever method. In cantilever method structural system changes according to the progress in construction. Then errors may be accumulated and amplified through complicated construction steps. Even if the section dimensions are controlled within the specification allowance limit, cable force and girder deflection will have errors far exceeding the allowance limits. Although the design is accurate and correct construction is done, a certain amount of errors in cable tension and geometry is inevitable. Thus, the feedback process of measurement and adjustment is required for more accurate construction. The error control system consists of the processes of measurement, construction stage analysis, error factor estimation, prediction and optimum adjustment. In the analysis system composite action of concrete slab and steel girder evaluated by the proposed stiffness matrix. Output results are accumulated for each load increment. Also, various construction commands are defined to simulate complicated construction procedure. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The error factor estimation and prediction system can calculate the quantitive value of error factors and show behavior of structures at later steps. Adjustments can be possible based on final step information. The proposed system can provide tools for adjustment and cable adjustment base applications.

콘크리트 박스 거더 교량의 박스형 교각 절점부의 설계에 관한 연구

강원호,변형균,방지환,박대묵 東亞大學校 建設技術硏究所 1996 硏究論文集 Vol.20 No.1

Strut-and-tie models can illustrate very well the internal flow of forces in structural concrete and thereby, provide valuable assistance to the designer who is striving for an appropriate and functional conceptual design. After some introductory statements this will be demonstrated by dimensioning and detailing the support region of concrete box girders. In this paper it will be shown how a strut-and-tie model for the different arrangement of transverse diaphragm are developed and how in the model the interaction between the longitudinal and cross sections must be considered.

Design of the Support Region of Concrete Box Girder on Box Column

Kang, Won-Ho,Byun, Hyung-Kyun,Bhang, Jee-Hwan,Park, Dae-Muk 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1

Strut-and-tie models can illustrate very well the internal flow of forces in structural concrete and thereby, provide valuable assistance to the designer who is striving for an appropriate and functional conceptual design. After some introductory statements this will be demonstrated by dimensioning and detailing the support region of concrete box girders. In this paper it will be shown how a strut-and-tie model for the different arrangement of transverse diaphragm are developed and how in the model the interaction between the longitudinal and cross sections must be considered.

강섬유 보강 콘크리트의 휨 피로거동

李英浩,朴弘用,邊炯均 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

Steel fiber reinforced concrete is a cement-based material reinforced with short steel fibers. Debonding and pulling out of fibers require more energy, giving a substantial increase in toughness and resistance to cyclic and dynamic loads. This experimental study were carried out in order to investigate the static and fatigue flexural behavior of steel fiber reinforced concrete. Test parameters were the volume fraction of steel fiber, aspect ratio and initial crack depth. The experiments of both static test and fatigue test were conducted. In the static test, the steel fiber reinforced concrete beam specimens of size 150 x 150x 550 ㎜ were tested under 4-point loading to investigate the flexural strength, notch sensitivity and toughness index. The fatigue test was also conducted to investigate the fatigue strength of steel fiber reinforced concrete. Also, RTA round pannel experiment was conduted to find the energy absorption capacity of steel fiber reinforced concrete and consturct in S-N curve to learn the fatigue behavior on test parameters. It was found that steel fiber reinforced concrete shows much better fatigue behavior than norma plain concrete.