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박지형,강무진,이교일,Park, Ji-Hyeong,Gang, Mu-Jin,Lee, Gyo-Il 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.1
Scheduling jobs effectively under consideration of actual loads on machines is one of the most complicated tasks in production control. The complexity of the finite capacity scheduling often makes the conventional methods of industrial engineering fail. As an alternative, Knowledge-based approaches to job-shop scheduling have been evolved recently. This paper presents a blackboard- based scheduling expert system which combines knowledge-based scheduling with interactive scheduling. It is shown to be possible to generate the feasible schedule within a reasonable time. Flexible reaction management is also possible while keeping the changes in the generated schedule to the minimal and adjusting the schedule to tardy operations or working environmental changes. The system is equipped with a rule base with heuristics for handling conflicted event. A case study applying the implemented system is described.
제진장치를 적용한 초고층 주거형 건축물의 횡변위 제어 성능 평가
박지형,김태호,김욱종,이도범,Park, Ji-Hyeong,Kim, Tae-Ho,Kim, Ook-Jong,Lee, Do-Bum 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.3
최근 급속하게 증가하고 있는 초고층 건축물은 바람이나 지진에 의한 횡변위를 효율적으로 제어하는 기술이 매우 중요하다. 그러나 국내의 초고층 주거형 건축물에 주로 사용되는 횡력 저항 구조시스템인 아웃리거 시스템은 별도의 공간을 요구하여 시공이 어렵고 공사 기간이 오래 걸리는 등의 불리한 점들이 있다. 반면 근래에 사용되고 있는 제진 시스템은 동적 하중에 의한 진동에너지를 부가적인 제진장치에 집중시킴으로써 건물의 횡변위를 저감시키며, 댐퍼의 설치도 비교적 용이하다. 또한, 아웃리거 설치와 같은 횡변위 제어시스템은 강성증가로 인해 풍응답이 증가되어 거주자의 불편과 같은 사용성 문제가 발생하기도 하며 이는 다른 추가적인 제어방식을 요구하게 된다. 따라서 본 연구에서는 초고층 주거형 건축물에 대한 횡변위를 효과적으로 제어하면서 아웃리거시스템을 대체 또는 보완할 수 있는 새로운 방법으로써 다양한 제진장치를 적용하여 각각의 횡변위제어 성능을 검토해보았다. The problem controlling lateral drift by the wind and the earthquake is very important in high rise buildings. But, outrigger system, generally used for residential tall buildings in Korea, has weak points with the occupancy of special space, the difficult construction and the long duration of works. On the other hand, the damper reduces story drifts of building structure by absorbing vibration energy induced by the dynamic loads and the application of damper systems is relatively simple. Also, the lateral drift control system such as outrigger system may raise the wind vibration problem of serviceability like human comfort and this problem may need another vibration control devices. Accordingly, we analyze the effect of the drift control using various dampers to substitute for outrigger system as the efficient system in residential tall buildings.
초고층 건축물의 아웃리거 시스템을 대체하기 위한 제진장치의 적용
박지형(Park Ji-Hyeong),김태호(Kim Tae-Ho),김욱종(Kim Ook-Jong),이도범(Lee Do-Bum) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Recently, it is spreading that the trial of actively reducing drift in high-rise buildings by strengthening the Seismic design regulation of Korean Building Code-structural(KBC2005). In particular, the structural systems of buildings have the influence on the cost and the duration of work in building construction owing to a variety of the lateral resistance structural systems of high rise building. But, most high-rise buildings in the country are using outrigger system with weak points, which are the construction deterioration, the limitation of building plan, the term delay of works, and so on. Accordingly, in this study we examine the structural behavior of the case with outrigger system in high rise buildings by using response spectrum analysis and time history analysis, and then estimate the performance of elasto-plastic hysteretic damper instead of outrigger system.
김태호(Kim Tae-Ho),박지형(Park Ji-Hyeong),김욱종(Kim Ook-Jong),이도범(Lee Do-Bum) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In recent years, time history analysis is often applied for the vibration analysis of tall building with energy dissipation systems. Earthquake ground motions used to this method shall be scaled such that the average value of the 5 percent damped response spectra for the suite of motions is not less than the design response spectrum for the site for periods ranging from 0.2T to 1.5T where T is the natural period of the structure in the fundamental mode for the direction of response being analyzed. There is little difference of the responses obtained by response spectrum analysis and time history analysis of the structures with short fundamental period. However, the gap of the structural results calculated by the two analysis methods is more increased since the building structures have longer period. In this study, the scaling method of ground motions is improved to easily used for structural engineers that have difficult to simulate the artificial ground motions.
국제 철도 연맹 규정(UIC Code)에 따른 RCV 대차 프레임 구조 안전성 평가
노상철(Sang Cheol Rho),박지형(Ji Hyeong Park),강신유(Shin You Kang) 강원대학교 산업기술연구소 2023 産業技術硏究 Vol.43 No.1
Nowadays, traffic congestion is emerging as a major problem due to the rapid population growth and the increase in automobiles. The train is a convenient means of transportation that can efficiently solve these problems. Trains have been developed in line with human aspirations for a long time, but research on safety is still insufficient. This study aims to check safety by conducting static tests and fatigue tests on bogie frames, and to help develop bogie frames in the future. For the static test, a strain gauge was attached to the point where the local stress concentration was expected beforehand, and the result value was derived, compared with existing theories, and expressed as a Goodman diagram. In the fatigue test, a total of 10 million loads were applied over three stages, and no cracks appeared in the non-destructive test conducted after each stage. Both tests were conducted according to the strict test method of the bogie frame presented by the UIC Code. It satisfied both fatigue life and strength evaluation criteria and was judged to be a bogie frame usable for safe train production.
김태호(Kim Tae-Ho),박지형(Park Ji-Hyeong),김욱종(Kim Ook-Jong),이도범(Lee Do-Bum) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The bending deformation of building structures increases as the height of the structure becomes higher, but on the other hand the lateral deformation of low rise building mainly accounts for the deformation by shear mode. Therefore, damping devices which dissipate energy by installing interstory are known as more effective for low rise building structure. Accordingly, The object of this study investigates the effective applying methods for these devices in tall building structures. To this end, the effect of drift control of the example structures is analyzed for the horizontal allocation of damping devices. And the responses of dampers are examined for considering with and without regard to the shear mode of deformation. When the dampers are applied in tall building structures, it is more effective that the design deformation of dampers should be only considered the shear mode. Also, it is more efficient for drift control that the dampers are allocated in or adjacent to the larger stiffness parts such as shear walls in horizontal plan.