• 전기학회논문지
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• 제56권6호
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• pp.1117-1121
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• 2007

We demonstrate a wavelength swept mode-locked ring laser for the frequency domain optical coherence tomography(FD OCT). A laser is constructed by using a semiconductor optical amplifier, fiber Fabry-Perot tunable filter and 2.6 km fiber ring cavity. Mode-locking is implemented by 2.6 km fiber ring cavity for matching the fundamental or harmonic of cavity roundtrip time to a sweep period. The wavelength sweeps are repetitively generated with the repetition period of 77.2 kHz which is the parallel resonance frequency of Fabry-Perot tunable filter for the low driving current consumption of the fiber Fabry-Perot tunable filter. The wavelength tuning range of the laser is more than FWHM of 61 nm centered at the wavelength of 1320 nm and the linewidth of the source is $0.014{\pm}0.002$ nm.

• 한국광학회지
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• 제10권1호
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• pp.1-4
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• 1999

공초점 현미경 시스템을 사용하여 반복률이 17MHz이며, 중심파장이 638nm인 극초단 펄스 다이오드 레이저에 의해서 여기된 단분자의 형광폭발신호를 게측하였다. 에칠렌글리콜 용액에 있는 적색 색소 분자(JA22)를 시료로 사용하였다. 시상관 단광자 계수기응 사용하여 단분자들의 현광소멸곡선을 수집하였으며, maximum likelihood estimator로 그것들을 분석하였다. 색소 분자당 40개 이상의 광자수를 가지고 분석하였을 때, 21%의 오차 확률로 형광소멸시간을 계측하는 것이 가능하였다.

• Journal of electromagnetic engineering and science
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• 제3권1호
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• pp.50-56
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• 2003

This paper proposes a coding scheme of control channel for mobile packet communication to maximize the minimum Hamming distance, which is based on shifting of basis vectors of Reed Muller code with optimized dynamic puncturing and/or(partial) sequence repetition. Since the maximum likelihood decoding can be performed using the extremely simple FHT(Fast Hadamard Transformation), it is suitable for real time optimum decoding of control channel information with very little complexity. We show applications of the proposed coding method to TFCI(Transport Format Combination Indicator) code in split and normal modes of 3GPP W-CDMA system. We also discuss how this method can reduce rate indication error over AWGN(Additive White Gaussian Noise) as well as fading channels when the proposed coding scheme is applied to 1xEV-DV system of $3^{rd}$TEX> generation partnership project 2(3GPP2) to indicate the data rate transmitted on the reverse traffic channel by a Mobile Station(MS).

• 한국산업정보학회논문지
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• 제7권3호
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• pp.81-88
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• 2002

본 논문에서는 실시간에 많은 회수의 해석처리를 요하는 문제에 대한 자바 코드 성능 향상을 위한 실시간 클래스 생성 방식을 제안한다. 먼저 해석 처리한 결과를 실시간에 동적으로 자바 소스로 생성하고 컴파일한 뒤 메모리에 적재시키며, 이후에는 생성된 클래스의 메소드 호출에 의해 계산이 처리되도록 한다. 이렇게 함으로써 매번 해석에 따른 시간 부담을 감소시켜 반복 계산의 성능의 향상시켰다.

• 감성과학
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• 제4권1호
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• pp.61-67
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• 2001

This paper described the effect of subjective approach in case of the human sensibility experiments. The procedure is proceeded subjectively. Human faces are selected as the image presentation media. Pleasant and unpleasant images are selected directly by examiner, And also the image presentation system, which is executed with a computer and has the square-type black box monitor equipment, is manufactured. Images are presented with the step-variation time interval technique. questionnaire test and EEG signal detection data are analyzed. The analysis parameters are a “frequency band integral value” and a “band differential variation ratio”. he results show the high sensibility and fast response. The fact that image presenting repetition alleviates is verified.

• 전기학회논문지
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• 제58권7호
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• pp.1393-1397
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• 2009

A high-speed wavelength swept laser, which is based on oscillation characteristics of a fiber Fabry-Perot tunable filter, is described. The laser is constructed by using a semiconductor optical amplifier, a fiber Fabry-Perot tunable filter, and 3.348 km fiber ring cavity. The wavelength sweeps are repeatatively generated with the repetition period of 61 kHz which is the first parallel oscillation frequency of the Fabry-Perot tunable filter for the low power consumption. Mode-locking is implemented by 3.348 km fiber ring cavity for matching the fundamental of cavity roundtrip time to the sweep period. The wavelength tuning range of the laser is 87 nm(FWHM) and the average output power is 1.284 mW.

• 전기학회논문지P
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• 제66권4호
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• pp.247-251
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• 2017

This paper proposes a low power transmission technique for single-carrier modulation with frequency domain equalization. As time domain signals and frequency domain signals have unique corresponding functions, inserting zeros after each symbol causes a repetition in other domain, so maximal ratio combining technique using repetitive transmission can be applied in the frequency domain. In this paper, we configure transmit signals to insert zeros after each symbols for single-carrier modulation with frequency domain equalization and maximal ratio receive combining block in the receiver structures, propose a structure for transmitter and receiver and show that its performance is better than the traditional algorithm by simulations.

• Clinical and Experimental Pediatrics
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• 제52권7호
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• pp.756-765
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• 2009

This paper aims to provide an introduction to junior authors on how to write a medical paper in a clearer and more scientific manner. One important thing to be always remembered is that the reviewer and the reader will be reading your paper for the first time, and thus, you should make it as lucid as possible. You should pay attention to consistency in every regard in your paper. Use of the active voice usually makes the sentences shorter and clearer in meaning. Organize your content carefully and present it logically, avoiding unnecessary repetition in different sections. Give a diligent thought to every aspect; research is a work of the mind, not of the hands. Write technically, using powerful language. Most importantly, fulfill the exact submission requirements of the journal.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2007년도 추계학술대회 및 정기총회
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• pp.418-421
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• 2007

For Shock obsorber piston led is launched to the market through luring, milling, grooving, rolling, inspection and finally packing processes, To this time around 11 items, that is, out diameter and length etc..for the piston lod are inspected strictly as a total inspection. Piston Lod is being produced 30,000 a day and its excessively repeating inspection is getting induce repetition strain injury and reduce production rate as fatigue accumulation of worker increase inspection errors. Therefore, for the inspection process is severely needed a progressive improvement through the automation. In this study, we consider automation method of piston led inspection process and suggest an efficient automation strategy as improving the various problems in present manual inspection way.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제13권2호
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• pp.117-127
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• 2010

This paper aims to give beginners an introductory course on how to write a medical paper more effectively. Bear in mind the reviewer and the reader will be reading your paper for the first time, so you should write it easily. Everything in your paper must be coherent. Use of the active voice is usually shorter and clearer. Organize your story carefully and logically, and then you can avoid unnecessary repetition in different sections. Think hard, because research is made by the mind, not by the hands. Write technically and powerfully. Above all, you have to meet the submission regulation of the target journal exactly.