• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.6
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• pp.1022-1025
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• 2008

This paper presents the generation of the high voltage squarewave pulse using distributed RLC circuit. The demonstrated test was performed with the distributed RLC circuit which consists of the resistance, the inductance and the capacitance. Pspice simulation was also conducted about the experiment circuit. The result of the experiment was in good agreement with the result of the simulation. Theoretical analysis of the initial peak value at the squraewave pulse was derived from the results of the experiment and simulation. Additionally, the characteristics of the time delay was analyzed about the spherical gap switch and the surface discharge gap switch, respectively. It is concluded that the surface discharge gap switch is better than the spherical gap switch to reduce the time delay.

• The Journal of the Acoustical Society of Korea
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• v.26 no.1
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• pp.32-41
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• 2007

The control room has been usually designed by the consideration of only one listening position for the sound engineer. By this study. many listening positions with the very similar acoustical condition were located in the specific region, so-called 'the reflection free zone', where the several engineer could evaluate the quality of sound at the same time. For constructing the reflection free zone, the control room has been designed by the concept of the $LEDE^{TM}$, and the initial time delay gap has been controled by the structure of control room and the properties of sound-absorbing materials. diffuser, Helmholtz resonator and image source of sound. The occurrence of any harmful phenomena like the standing wave, acoustic focusing. coloring. Hass effect and flutter echo, has greatly reduced in the reflection free zone.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.147-150
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• 2004

The reverberation characteristics of the Korean Traditional buildings aren't well-known, but there could be many particular properties. In this study, we compare the reverberation characteristics of a Korean traditional building of a temple, ‘Magoksa’, with three modern buildings. We use 5 parameters which have been widely studied in architectural acoustics such as reverberation time, early decay time, clarity, initial-time delay gap and R/D ratio.

• The Journal of the Acoustical Society of Korea
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• v.3 no.2
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• pp.3-12
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• 1984

This paper is to suggest the optimum structure and the rating scale of PANSORI hall. The method of this study is as follows. 1. Consideration for the characteristics of OPANSORI and Beranek's music & acoustic theory. 2. To take advice from the expert. 3. The experiment and evaluation of a model. 4. The structure of PANSORI hall and the study of the availability in Beranek's rating scale of orchestra and opera. 5. The establishment of the rating scale in PANSORI hall. 6. The evaluation of the forms of performance in each hall. The result of this study, the proper hall in the performance of PANSORI is, 1. The initial time delay gap less than 25ms. 2. The reverberation time of the extents of 1.2 seconds. 3. The proper average bass ratio of 1.25 extents. 4. The distance from performers to audience is within 30 meters. 5. THE VOLUME OF HALL IS 450-7400 ㎥ extents. 6. It should be designed not to be a acoustical disturbancenoise, echo, and the unbalance of sound pressure level, etc.

• Proceedings of the Acoustical Society of Korea Conference
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• 1992.06a
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• pp.3-8
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• 1992

The theory of subjective preference with temporal and spatial factors which include sound signals arriving at both ears is described. Then, auditory evoked potentials which may relate to a primitive subjective response namely subjective preference are discussed. According to such fundamental phenomena, a workable model of human auditory-brain system is proposed. For eample, important subjective attributes, such as loudness, coloration, threshold of preception of a reflection and echo distrubance as well as subjective preference in relation to the initial time delay gap between the direct sound and the first reflection, and the subsequent reverberation time are well described by the autocorrelation function of source signals. Speech clarity, subjective diffuseness as well as subjective preference are related to the magnitude of inter-aural crosscorrelation function (IACC). Even the caktail party effects may be eplained by spatialization of human brain, i.e., independence of temporal and spatial factors.

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06e
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• pp.65-68
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• 1998

국악의 대중적 공연에 적합한 공연장에 대하여는 아직 그 주관적 객관적 기준이 설립되어 있지 않다. 현재 국립국악원에 있는 예악당은 국악을 위한 대중적 공연장의 기준이 되어야 하나 국악인들과 국악관계자들의 사이에서 국악의 공연에 적합하지 않은 것으로 평가되고 있다. 본 논문에서는 국립국악원의 예악당을, Maximum Length Sequence, 무지향성스피커, dummy head 등을 이용하여 여러 가지 중요한 객관적 지표인 잔향시간, IACC, Initial-time-delay gap등을 측정하고 한 편으로는 컴퓨터 시뮬레이션에 의한 객관적 지표의 추출을 통하여 비교 분석하였다. 그리고, 이를 토대로 예악당의 음향특성을 개선방향과 국악에 대한 주관적 객관적 지표의 설정 방법을 제시하고자 한다.

• Journal of Korean Society of Transportation
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• v.29 no.2
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• pp.111-121
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• 2011

This paper discusses a method for optimizing the semi-actuated traffic signal control system by adjusting the initial interval according to the number of vehicles waiting for the green light in the actuated phase. We also present a Left-Turn actuated traffic signal control strategy that examines the vehicular noise in the detection area and determines the phase extension and the gap-out. In order to detect the vehicles in real-time, an image detector's Video Image Tracking technology was adopted. A 'Zone in Zone'method was implemented, and the image detection area is segmented into three zones: 1) Zone1 for verifying a vehicles obligatory presence, 2) Zone2 for counting the standby vehicles, and 3) Zone3 for examining the number of vehicles that have passed. The on-site assessment of the Left Turn Actuated Control is carried out using CORSIM, and the results show that the Control Delay decreased by 23.10%, 15.06%, and 4.34% compared to the delays resulted from pre-timed control, semi-actuated control-1 and semi-actuated control-2 traffic signal control systems respectively. The Queue Time also decreased by 36.24%, 20.10% and the Total Time by 14.36%, 7.02% for the same scenario. Which clearly demonstrates the operational efficiency. A sensitivity analysis reveals that the improvement from the propose traffic control strategy tends to increase as the through traffic volume reaches a saturated condition and the left-turn traffic volume decreases.