• Journal of Advanced Navigation Technology
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• v.7 no.1
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• pp.6-13
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• 2003

In this paper, a non-coherent code tracking loop is designed for 3GPP HSDPA MODEM and its performance is analyzed in terms of steady-state jitter variance and transient response characteristics. Analytical closed-form formula for steady-state jitter variance is first derived for AWGN environments as a function of pulse-shaping filter, timing offset, signal-to-interference ratio, and loop bandwidth. Also obtained is the transient response characteristic of a tracking loop. Finally, the performance of the designed tracking loop is confirmed by computer simulations.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05a
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• pp.309-314
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• 1996

가압 경수로형 원전 안전정지/ 안전 주입 변수와 관련된 계기는 관련 기술 기준에 따라 정기 보수시 교정이 이루어지면, 정지 신호를 모의 주입하여 물리량 검출기로 부터 원자로 정지집계 권선의 풀림시간까지의 총 응답 시간이 사고해석시 가정된 계통의 응답 지연시간이내에 들어 있는 지를 확인한다. 이 정지 신호에 응답하는 동적 보상기의 특성과 관련하여 설계과정에서 삽입된 근사화 오차에 대한 정략적인 평가가 이미 알려진 바 있고, 시간 응답 측정시 삽입되는 지연 요소로 인한 오차도 이에 포함시켜 분석한 바 있어 실제 교정시 정밀도 향상을 위하여 활용하고 있다. 이 논문을 통하여 원자로 정지계통의 응답시간 측정시 노 냉각수 평균 온도 변화율 동적 보상 미분-지연 카드에 모의입력으로 스텝신호를 주입할 경우, 이를 과도하게 큰 신호로 인식하여 매우 짧은 시간(1초 이내)에 응답되고, 스텝신호대신 1%P.U./초로 평균온도 변화율만을 주입할 경우, 보다 늦게 응답됨을 밝혔다. 따라서 모의 시험 방범에 있어서 입력 선택을 적합하게 하여야만 계통의 건전성을 응답시간으로 확인한 수 있는 데, 이에 적합한 모의 입력 방법을 제안하였다.

• Journal of Digital Convergence
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• v.13 no.1
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• pp.269-274
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• 2015

According to the development of IT industry, prevalence of AOI equipment is spreading, and also requiring the high resolution of the camera used in the equipment. The weight of the camera is increased to obtain a high resolution, and thus increases the vibration displacement is a problem occurring in the picturing, camera motion control also becomes difficult. In this study, using a finite element analysis program NX/NASTRAN, the transient response of the camera was analysed which is subjected to an impact force due to inertia. The finite element analysis result is correlated with laser interferometer measurement. When AOI equipment is restructuring, the correlated finite element analysis model can be used to verify the authenticity of the new design.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.791-794
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• 2013

Electronic systems may be cause of various serious failures due to an ionizing radiation effect when exposed to a prompt gamma-ray pulse. This transient electrical malfunction can, in some cases, results in a failure of the electronic system of which the circuits are a part. Transient radiation measurement and evaluation system is required to development for enhanced radiation-resistance against the initial nuclear radiation produced by the detonation of a nuclear weapon of semiconductor devices. In these studies, we performed the following work. In the first part of the work, we carried out a SPICE simulation applied to nuclear radiation condition for PN diode and we also investigated the photocurrent by a pulsed gamma-ray on a PN diode using a TCAD simulation.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.723-726
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• 2011

전 세계적으로 사회기반시설 및 신재생 에너지 생산을 위한 공간부족 문제를 해결하기 위하여 초대형 부유구조물에 대한 관심이 증가하고 있다. 다양한 사용분야에 대한 안정성 확보를 위해 파랑하중에 의한 동적 응답과 부유체의 강성 대비 길이 효과로 인해 발생할 수 있는 특이 거동에 대한 분석이 필요하다. 초대형 부유구조물의 경우 중앙부에 비해 양끝 단에서 과도한 응답이 발생하며, 이를 해결하기 위해 입사파가 들어오는 초대형 부유구조물의 단부에 부착되는 다양한 감요장치(anti-motion device)가 제안되어지고 있다. 초대형 부유구조물에 감요장치가 적용될 경우 입사파에 의한 동적 파압을 감소시켜 구조물의 전반적인 응답을 줄여줄 수는 있지만 감요장치의 질량이 클 경우 오히려 끝단의 응답을 증폭시킬 수 있다. 본 논문에서는 양단 자유 경계조건의 탄성지지된 보를 이용하여 초대형 부유구조물의 길이와 끝단에 부착된 감요장치의 질량으로 인한 영향을 분석하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.3
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• pp.101-108
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• 1999

Ths paper describes the transient response characteristics of the grounding systems for electric power facilities against impluse currents. In this work, when the impulse current was injected through the grounding conductor for arrester, the investigations treasuring and analyzing potential rises induced at the cormron cormection trint and other grounding conductors were conducted. The lightning impulse current was awliErl so as to simulate the on-set of arrester due to lightning surges. Measured results of impulse response characteristics from the present experinrrits are as follows;

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.4
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• pp.915-922
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• 1999

The field dependent characteristics of electron transport with GaAs impact ionization have been analyzed, using GaAa full band E-k relationship. The E-k relationship is derived from empirical pseudopotential method, using Fermi's golden rule and local form factor, and Brillouin zone is divided into tetrahedrons for calculating impact ionization rate, and tetrahedron method, in which integrates each tetrahedrons, is used. Monte Carlo simulation is used for analyzing anisotropy of impact ionization. A result of transient analysis for impact ionization has presented that anisotropy of impact ionization only arises during transient state and impact ionization is isotropic under steady state. Anisotropic characteristics of impact ionization for GaAs, which is presented in this paper, can be used in carrying out a transient analysis for GaAs devices.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.05a
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• pp.266-267
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• 2010

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 1978.04a
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• pp.98.1-98
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• 1978

Commensalistic system을 구성하는 B. tropicatis 와 T. cutaneum의 회분 및 연속배양을 통하여 여러 가지 동력학적 data를 구하고 mathematical model을 연구하여 다음과 같은 모형을 구성하였다. (equation omitted) 위의 모형을 computer simulation하여 정상상태와 과도상태에서의 응답을 분석하고 중요한 배양결과를 예측하였다.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.1
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• pp.32-39
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• 2004

Biological neurons generally have chaotic characteristics for permanent or transient period. The effects of chaotic response of biological neuron have not yet been verified by using analytical methods. Even though the transient chaos of neuron could be beneficial to overcoming the local minimum problem, the permanent chaotic response gives adverse effect on optimization problems in general. To solve optimization problems, which are needed in almost all neural network applications such as pattern recognition, identification or prediction, and control, the neuron should have one stable fixed point. In this paper, the dynamic characteristics of the chaotic dynamic neuron and the condition that produces the chaotic response are analyzed, and the convergence conditions are presented.