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탄도미사일의 비행특성을 고려한 요격미사일 소요 알고리즘
김흥섭,김기태,전건욱,Kim, Heung-Seob,Kim, Ki-Tae,Jeon, Geon-Wook 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
A Ballistic Missile(BM) is a missile that follows a sub-orbital ballistic flightpath with the objective of delivering one or more wardheads to a predetermined target and An Anti-Ballistic Missile(ABM) is a missile designed to destroy a ballistic missile before reaching its target. The main objective of this study is to assess the requirement of ABM by considering both flight characteristic of the SCUD-B/C, Nodong missiles and intercept performance of ABM in the Lower tier Ballistic Missile Defense(BMD). The Ballistic Missile's flight characteristics, such as trajectory, velocity etc., are estimated by simulation using the physical motion equations. The requirement of ABM is calculated by evaluating whether the BMD forces can defend those when the ballistic missiles attack prime facilities.
김흥섭,홍진석,오재응,Kim, Heung-Seob,Hong, Jin-Seok,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
This study experimentally demonstrates the use of active muffler attached to the automotive exhaust system to reduce exhaust noise. For improving the signal to noise ratio in the process of estimation of secondary path transfer functions, the on-line algorithm that conventional inverse modeling is combined with adaptive line enhancer is used as the control algorithm. Active muffler is designed that the primary noise and the control sound are propagated as a plane wave in the outlet. Therefore, the error microphone could be placed out of the tail pipe center of a high temperature and the radiation noise to the outside could be reduced in the whole area around the outlet. The control experiment for reducing exhaust noise with active muffler is implemented during run-up at no load. From the experimental results presented, compared with the conventional off-line method, the proposed on-line method is capable to acquire a reduction of exhaust noise above 5 dB in overall sound power level.
부가경로 전달함수의 온라인 예측에 의한 능동소음제어의 성능 향상
김흥섭,손동구,오재응,Kim, Heung-Seob,Sohn, Dong-Gu,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2
In the conventional inverse modeling method for on-line modeling of the secondary path transfer function, the signal to noise ratio between the arbitrary random signal and the plant noise have to keep at -10 - -20 dB. For these reasons, the modeling can't be exactly implemented by the conventional method alone and the convergence time for modeling becomes too long. In this study, by combining the conventional inverse modeling method with an adaptive line enhancer, or with an adaptive noise canceller, a rigorous transfer functions of secondary path modeling and the control of a primary noise have been implemented simultaneously.
김흥섭,홍진석,오재응,Kim, Heung-Seob,Hong, Jin-Seok,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
In the case of the transfer function for the secondary path is dependent on time, the on-line method which can model it is continuously must be applied to the active noise control technique. And the adaptive random noise technique among the on-line methods is effective in the narrow-band control. In this method, the signal to noise ratio between random noise for modeling and primary noise is low. Therefore, the estimations of transfer function will be prone to inaccuracies and the convergence time will be too long. Such imperfections will have an influence upon the performance of an active noise controller. In this study, t enhance the signal to noise ratio, the on-line method that is combined the conventional adaptive random noise technique and the adaptive line enhancer, is proposed. By using proposed on-line method, a rigorous system identification and control of primary noise have been implemented.
동기화한 이산화법을 이용한 능동소음제어의 성능향상에 관한 연구
김흥섭,오재응,신준,Kim, Heung-Seob,Oh, Jae-Eung,Shin, Joon 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10
In this paper, active noise control is performed in a duct system using the periodic pulse train which corresponds to the periodic component of noise source as a reference signal. Control algorithm applied in this study is possible to eliminate the acoustic feedback which occurs in the conventional filtered-x and filtered-u LMS algorithm by using electrical reference signal and has the fast adaptation speed with low filter orders by using synchronous sampling method is discussed via computer simulations and experiments of case studies such as frequency modulation, amplitude modulation and frequency differency between source signal and reference signal.
배기소음 제어용 능동형 소음기의 제어 성능평가에 관한 연구
김흥섭,손동구,오재응,Kim, Heung-seob,Shon, Dong-Gu,Oh, Jae-Eung 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
Active mufflers have been mainly applied in the large industrial engine due to considerable expense for implementation, but a necessity of development has been increased by the tightened regulation of exhaust noise and the request of high power. In this study, the active muffler prototype for installing in an automobile is designed and constructed. The active muffler is designed so that the primary noise and the control sound are propagated as a plane wave in the outlet. Therefore, the error microphone could be placed outside the high temperature centers of the tail pipe, and the noise radiating to the outside could be reduced in the whole areas around the outlet. For evaluating the control performance of the prototype, the control experiments of band-pass filtered random signal and the modulation of sinusoidal signal which are generated from the primary noise speaker as practical exhaust sound level are implemented. And to investigate the radiation pattern from the outlet of tail pipe and the noise reduction level of points placed adjacent to the outlet, the sound level of adjacent points of thirty is measured.
김흥섭(Heung-Seob Kim),김판수(Pansoo Kim) 한국경영과학회 2014 經營 科學 Vol.31 No.2
In almost all of the organizations, the cost for acquiring and maintaining the inventory takes a considerable portion of the management budget, and thus a certain constraint is set upon the budget itself. The previous studies on inventory control for each item that aimed to improve the fill rate, backorder, and the expenditure on inventory are fitting for the commercially-operated SCM, but show some discrepancies when they are applied to the spare parts for repairing disabled systems. Therefore, many studies on systematic approach concept considering spare parts of various kinds simultaneously have been conducted to achieve effective performance for the inventory control at a lower cost, and primarily, METRIC series models can be named. However, the past studies were limited when dealing with the probability distributions for representing the situation on demand and transportation of the parts, with the (S-1, S) inventory control policy, and so on. To address these shortcomings, the Continuous Time Markov Chain (CTMC) model, which considers the phase-type distributions and the (s, Q) inventory control policies to best describe the real-world situations inclusively, is presented in this study. Additionally, by considering the cost versus the system availability, the optimization of the inventory level, based on this model, is also covered.
열공급 연계망에서 열생산비용의 최소화를 위한 최적 열생산 및 열수송 결정
김흥섭(Heung Seob Kim),윤원영(Won Young Yun) 대한산업공학회 2019 대한산업공학회지 Vol.45 No.2
Environmental problems are becoming increasingly serious and important. As a countermeasure to prevent air pollution, district heating systems with high energy efficiency and low pollution are considered as a good alternative. The heating supply system of district heating is divided into heat production, heat transportation, and heat consuming subsystems. First, heat production system is analyzed by capacity and cost. Second, heat transportation system is analyzed to determine the traffic volume. Finally, the heat consuming system is analyzed by atmospheric temperature and the usage characteristics. Based on the analysis of the three subsystems, a cost model to determine the heat tranfer amounts is proposed. A case study with data of Korea District Heating Corporation is done. Additionally, sensitivity analysis is made to investigate the effect of changing market situation to the optimal solution.