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자동차 실내 소음저감을 위한 다채널 능동소음 제어에 관한 연구 II : 모의 실험
김흥섭,이태연,신준,오재응,Kim, H.S.,Lee, T.Y.,Shin, J.,Oh, J.E. 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.6
Active noise control of random noise which propatate in the vehicle cabin as a form of spherical wave is the target of this study. In the previous study, the adaptive algorithm for adaptive controller is presented for the application in active noise control system. And for the preliminary study of adaptive active noise control in vehicle cabin as a real system, a computer simulation is performed on the effectiveness of the adaptive algorithm in the amplitude of the pressure fluctuation. This work studies the implementation of multi-channel feedforward adaptive algorithm for the reduction of the noise inside a vehicle cabin using a number of secondary sources derived by adaptive filtering of reference noise source. Multi-channel adaptive feedforward algorithm are verified in numerical simulation and semi-experimental justification of developed system is made on a domestic passenger car. In the results of semi-experimental study, the noise of specific region in the interior of automobile are reduced for the appreciabe sound pressure level in the operating engine rpm and finally this study suggests the capabilities of the real time active noise control in 3 dimensional acoustic fields.
자료포락분석법을 이용한 신재생에너지 핵심기술 R&D 효율성 분석 : 질적 성과물을 중심으로
김흥섭,최경현 한국기술혁신학회 2020 기술혁신학회지 Vol.23 No.5
To improve the climate environment, the government is promoting the transition to eco-friendly energy through a plan to increase investment in energy technology development. Among them, in order to achieve the goal of preoccupying the core technologies of new and renewable energy, it is necessary to establish a strategy through efficiency analysis using qualitative outcomes. Therefore, this study uses the data envelope analysis method to determine the relative efficiency of the new and renewable energy core technology development tasks from 2014 to 2018 by using three qualitative outcomes. As a result of the analysis, most of the projects excluding hydrogen, solar power, and coal-using sectors out of the 11 sectors had low relative efficiency due to the uneconomical investment scale, so it is necessary to efficiently adjust the R&D investment scale. As a result, through this study, it can be meaningful that an analysis model based on qualitative outcomes was presented to achieve the goal of energy conversion policy and preempt technology. In addition, it is considered that future research will be possible to track changes in efficiency using additional qualitative outcomes. 기후환경 개선을 위해 정부는 에너지기술개발 투자 증가 계획을 통해 친환경 에너지로 전환을 추진하고 있다. 이 중 신재생에너지 핵심기술 선점이라는 목표 달성을 위해서는 질적 성과물을 활용한 효율성 분석을 통한 전략수립이 필요하다. 따라서 본 연구는 자료포락분석법을 이용하여 2014년부터 2018년까지의 신재생에너지 핵심기술개발과제를 질적 성과물인 표준화된 순위보정영향력지수, 특허 SMART Grade, 기술 수준 개선 지표 3가지를 활용하여 상대적 효율성을 분석하였다. 분석결과, 11개 분야 중 수소, 태양열, 석탄이용 분야를 제외한 대부분의 프로젝트는 비경제적인 투자규모로 인해 상대적 효율성은 낮았기 때문에 연구개발 투자규모를 효율적으로 조정할 필요가 있다. 하지만 상대적 효율성이 낮더라도 성장잠재력이 큰 분야도 있을 수 있기에 정책적 방향을 고려한 투자가 필요하다. 결과적으로 본 연구를 통해 에너지 전환 정책의 목표 달성과 함께 기술선점을 위해 질적 성과물 기반의 분석 모델을 제시하였다는 의미를 가질 수 있다. 또한, 향후 연구로는 추가적 질적 성과물을 활용한 효율성 변화를 추적하는 연구도 가능할 것이라고 생각된다.
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.
김흥섭,전건욱 대한산업공학회 2012 산업공학 Vol.25 No.2
The reliability is defined as a probability that a system will operate properly for a specified period of time under the design operating conditions without failure and it has been considered as one of the major design parameters in the field of industries. Reliability-Redundancy Optimization Problem(RROP) involves selec tion of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. However, in practice both active and cold standby redundancies may be used within a particular system design. Therefore, a redundancy strategy(active, cold standby) for each subsystem in order to maximize system reliability is considered in this study. Due to the nature of RROP, i.e. NP-hard problem, A Parallel Particle Swarm Optimization(PPSO) algorithm is proposed to solve the mathematical programming model and it gives consistently better quality solutions than existing studies for benchmark problems.
김흥섭 한국문화공간건축학회 2002 한국문화공간건축학회논문집 Vol.- No.8
It is just one of those common things that buildings built only for using by economic activity have been lost without any document. Among these buildings, this study has examined on the drying room for tobacco leaves, especially with reference for layout, plan, scale, material of exterior and interior, space analysis, structural characteristics and architectural types. It was proved by analysis that the drying room for tobacco leaves could be regarded as architecture taken place in natural features of a region, not created by a very careful plan of an architect. Consequently, the drying room for tobacco leaves can be regarded as architecture adopted itself to circumstances. In addition, it is of excellent design shape and stability in the structure. And it is common to the buildings that they have opening of a firebox which carry out the same function, high interior space, vent holes, and inspect windows. The characteristics of this folk architecture is that they express material as it is and design frankness.