• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
• /
• pp.571-575
• /
• 2001

A protection scheme for hybrid active power filters, which is combined shunt passive filter and small rated series active filter, is presented and analyzed in this paper. The proposed series active power filter operated as a high impedance 'k($\Omega$)' to the fundamental component when over current occurs in the power distribution system, and three control strategies are proposed in this paper. The first is the method by detecting the fundamental source current through the p-q theory, the second is the method by detecting the fundamental component of load current in Synchronous Reference Frame (SRF) and the third is the method by detecting the input voltage. When the over current occurs in the power distribution system, the proposed scheme protects the series active power filter without additional protection circuits. The validity of proposed protection scheme is investigated through experimental result for the prototype hybrid active power filter system.

• 한국군사과학기술학회지
• /
• 제12권4호
• /
• pp.500-507
• /
• 2009

This paper presents a novel method which can detect a target in IR image for active protection system. The target in IR image for the active protection system is small, moreover it moves with enormous speed. The proposed algorithm is comprised of robust clutter rejection methods and target optimized detection algorithms for small target, and an advanced method of selecting a final target position in target area, it can work in some milliseconds. The proposed algorithm provides the active protective system with more correct positions than those of radar, so that helps the active protection system can defense all threats with the utmost precision.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제51권6호
• /
• pp.321-329
• /
• 2002

A protection scheme for series active compensator is presented and analyzed in this paper. The proposed series active compensator operated as a high impedance K($\Omega$) to the fundamentals when short-circuit faults occur in the power distribution system, and two control strategies are proposed in this paper The first is the method by detecting the fundamental source current through the p-q theory, the second is the method by detecting the fundamental component of load current in Synchronous Reference Frame(SRF). When the short-circuit faults occur in the power distribution system, the proposed scheme can protect the series active compensator without additional protection circuits. The validity of the Proposed Protection scheme was investigated through experimental results.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제4B권3호
• /
• pp.134-145
• /
• 2004

This paper presents and analyses protection schemes for a series active compensator, which consists of a Unified Power Quality Conditioner (UPQC) or a hybrid active power filter. The proposed series active compensator operates as a high impedance "k(D)" for the fundamental components of the power frequency during over current conditions in the distribution system. Two control strategies are proposed in this paper. The first strategy detects the fundamental source current using the p-q theory. The second strategy detects the fundamental component of the load current in the Synchronous Reference Frame (SRF). When over currents occur in the power distribution system momentarily, the proposed schemes protect the series active compensator without the need for additional protection circuits, and achieves excellent transient response. The validity of the proposed protection schemes is investigated through simulation and compared with experimental results using a hybrid active power filter systems.

• 한국지진공학회논문집
• /
• 제2권3호
• /
• pp.37-49
• /
• 1998

Research and a, pp.ication of earthquake protection system in Taiwan have become very active since about ten years ago. Many passive isolators, etc., have been studied extensively. These studies have resulted in a few practical a, pp.ications and proposals of two draft design provisions for seismic isolation design of bridges and buildings. In addition to the pass control, analytical studies on active semi-active control have also been very active and the experimental studies have scheduled in the near future. This paper summarise the progress on recent research and a, pp.ication of earthquake protection systems in Taiwan. The emphases are given to the control systems that have been a, pp.ied in practical a, pp.ications.

• 한국자동차공학회논문집
• /
• 제21권6호
• /
• pp.100-107
• /
• 2013

Although automotive safety technologies have been developed steadily, the efforts for pedestrian protection still seems to be insufficient. In a car-pedestrian accident, the structures such as the engine under a hood, the lower part of a windshield and the A-pillar are the major causes of fatal pedestrian injuries. Recently, there have been several studies on the active safety system to reduce the pedestrian injuries. The safety system consists of an active hood lift system and a pedestrian airbag. In this research, the safety performance of the active hood lift system and the pedestrian airbag is investigated by using the finite element method. The finite element model of the system is set up based on the head impact test, and the impact analyses are performed. The necessity and the usefulness of the safety system are verified.

• 융합보안논문지
• /
• 제5권3호
• /
• pp.33-41
• /
• 2005

네트워크 및 인터넷시장의 발전과 더불어 침해사고도 급증하고 있으며 그 방법도 다양해지고 있다. 이를 방어하기 위해 여러 가지 보안시스템이 개발되어 왔으나 관리자가 수동적으로 침입을 차단하는 형식을 띄고있다. 본 논문에서는 침입탐지 시스템의 패킷 분석능력과 공격에 대한 실시간 대응성을 높이기 위하여 리눅스 OS에서 방화벽기능을 담당하는 넷필터를 이용해 침입탐지 및 차단시스템을 설계하였다.

• Journal of Electrical Engineering and Technology
• /
• 제12권4호
• /
• pp.1627-1633
• /
• 2017

This paper proposes a voice enhancing ear-protection system which is based on feedback active noise control(FBANC). The proposed system selectively suppresses the background noise and preserves the talking voice by controlling the adaptive algorithm with the voice activity period detection module. The noise reduction performance of the proposed noise canceling algorithm is analytically derived for the two key performance affecting parameters, i.e., electro-acoustic coupling distance and noise bandwidth. The proposed system is also implemented with a floating-point DSP system and its performance is experimentally tested to compare with the analytically derived results. The achieved levels of noise reduction for the three different noise bandwidths cases, i.e., 10Hz, 50Hz, and 90Hz, are high to show 17.05dB, 10.54dB and 8.99dB, respectively. The feasibility of the proposed system is also shown by the peak noise reduction achieved more than 25dB while preserving the voice component in the frequency range between 200-800Hz.

• 한국자동차공학회논문집
• /
• 제14권4호
• /
• pp.123-131
• /
• 2006

The majority of pedestrian fatalities and injuries are caused by vehicle-pedestrian accidents. Recently, it has been recognized as a serious problem. Injuries of occupants in a vehicle have been decreased considerably. However, efforts for protection of pedestrians are still insufficient. These days, many advanced industries are striving for a better protection of pedestrians by using an active hood lift system, rather than reforming the existing structure. In this research, the active hood lift system is designed to enhance the performance for protection. The active hood lift system is analyzed by using the nonlinear finite element method. An optimization problem is formulated by incorporation of the analysis results. Orthogonal arrays are utilized to solve the formulated problem. An iterative optimization algothrithm using orthogonal arrays is utilized for design in the discrete space. It is found that the method can remarkably decrease the number of function evaluations.

• 한국화재소방학회논문지
• /
• 제24권2호
• /
• pp.126-132
• /
• 2010

2006년 1월 9일부터 시행되고 있는 주택 성능 등급 표시제도는 능동적(Active)대책으로서의 인명안전 확보에 대해 어느 정도의 등가성을 확보 할 수 있는 소방시설의 품질 및 성능 향상에 관한 내용을 포함하는 것으로 화재 안전의 확보차원에서 매우 바람직한 방향의 정책이라 보여 진다. 본 연구는 현재 국내에서 시행되고 있는 주택성능등급 표시제도의 항목 중 "화재-소방" 분야의 등급시행 활성화를 위해 각 성능 등급 분야에 대한 이론적 배경을 고찰하고 세부 평가 방식에 대한 합리적 개선점을 도출하기 위해 수행되었다. 연구 결과, 현행 주택 성능등급 제도에 따른 "화재-소방" 분야의 성능 향상을 위해서는 성능 등급 세부 항목에 대한 배점 기준을 상향시키는 제도적 정부 시책이 우선적으로 뒷받침 되어야 하고, 아울러 소방 관계법 규정의 시급한 관련 법규 제정이 필요 하다는 전제조건이 선결되어야함을 알 수 있었고, 이를 바탕으로 현행 세부 평가기준에 대한 개선안을 제시하였다.