• 대한교통학회지
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• 제19권6호
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• pp.7-17
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• 2001

본 연구는 교통관리 시스템의 유고검지 체계를 검토하여 기존 체계의 문제점과 한계점을 극복할 수 있는 새로운 검지체계를 구축하고 새로 구축된 검지 체계에 맞는 알고리즘을 개발하는데 연구 목적이 있다. 새로운 검지체계는 검지기 1개소의 설치로 다차로를 검지할 수 있으며 특히 1개 차로 내에서도 검지영역을 여러 개 검지할 수 있는 다 검지체계의 장점을 최대한 살린 시스템이므로 기존 체계의 한계성인 단일 검지영역 문제를 해소할 수 있으며 경제적으로 교통관리 시스템을 구축할 수 있는 장점을 가지고 있다. 이 시스템으로 고속도로와 국도상에서 유고 검지율을 기존의 APID와 DES를 비교하여 현장 시험 평가한 결과 이 시스템이 제일 높은 유고 검지율을 나타내어 기존 시스템보다 우수한 것으로 판명되었다.

• 대한전자공학회논문지SD
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• 제39권7호
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• pp.97-103
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• 2002

본 논문은 레이더 시스템이나 위성 통신용으로 사용되어지는 LVA(Logarithmic Video Amplifier) 설계에 관한 내용이다. 제안된 LVA는 입력단, 증폭단, 그리고 출력단으로 나뉘어진다. 넓은 동작 영역과 고속특성을 갖도록 새로운 직 ${\cdot}$ 병렬 구조를 제안하였으며 LVA와 전단인 Detector Diode와의 입력 범위 조절을 위하여 새로운 입력단을 설계하였다. 제안된 LVA는 1.5 um, 2-poly, 2-Metal, n-well, BiCMOS, 공정을 사용하였으며, 유효 칩 면적은 1310 um x 1540 um 고 10V 전압에서 190 mW 의 전력 소모를 나타내었다. 모의 실험 및 측정을 통하여 60 dB의 동작영역과 100 ns의 falling time을 나타내었다.

• 전자공학회논문지
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• 제51권11호
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• pp.101-106
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• 2014

본 논문에서는 자동 이득 제어 회로를 이용한 와이드 다이나믹 레인지 RF root-mean-square (RMS) 전력 검출기를 소개한다. 제안하는 자동 이득 제어는 voltage gain amplifier (VGA), RMS 변환 블록, 이득 조절 블록으로 구성되어 있다. VGA는 dB-linear한 이득 관계를 갖는 캐스코드 VGA를 사용하였다. 제안하는 RMS 변환은 입력 신호 전 파장의 제곱 변환을 이용하여 RMS에 비례하는 DC 전압을 출력한다. 제안하는 RMS 전력 검출기는 500MHz에서 5GHz에서 작동하며 검출 범위는 0 dBm에서 -70dBm 이상의 신호를 -4.53 mV/dBm의 비율로 검출한다. 제안하는 RMS 전력 검출기는 TSMC 65nm 공정을 사용하여 설계되었으며 1.2V에서 5mW의 전력소비를 갖는다. 칩 레이아웃 면적은 $0.0097mm^2$이다.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.420-427
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• 2017

This paper proposes a new method using Wide Line Detector based statistical shape Feature (WLDF) to identify whether or not a tongue is cracked; a cracked tongue is one of the most frequently used visible features for diagnosis in traditional Chinese Medicine (TCM). We first detected a wide line in the tongue image, and then extracted WLDF, such as the maximum length of each detected region, and the ratio between maximum length and the area of the detected region. We trained a binary support vector machine (SVM) based on the WLDF to build a classifier for cracked tongues. We conducted an experiment based on our proposed scheme, using 196 samples of cracked tongues and 245 samples of non-cracked tongues. The results of the experiment indicate that the recognition accuracy of the proposed method is greater than 95%. In addition, we provide an analysis of the results of this experiment with different parameters, demonstrating the feasibility and effectiveness of the proposed scheme.

• 천문학회지
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• 제38권2호
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• pp.109-112
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• 2005

We present the design, expected performance, and current status of the wide field near-infrared camera (OAOWFC) now being developed at Okayama Astrophysical Observatory, NAOJ, NINS. OAOWFC is a near-infrared survey telescope whose effective aperture is 91cm. It works at Y, J, H, and $K_s$ bands and is dedicated to the survey of long period variable stars in the Galactic plane. The field of view is $0.95 {\times} 0.95 deg^2$ which is covered by one HAWAII-2 RG detector of 2048 ${\times}$ 2048 pixels with the pixel size of $18.5 {\mu}m\;{\times}\;18.5{\mu}m$, that results in the sampling pitch of 1.6 arcsec/pixel. OAOWFC can sweep the area of $840 deg^2$ every 3 weeks, attaining a limiting magnitude of 13 in $K_s$ band. It allows us to observe long period variables embedded in the Galactic plane where interstellar extinction is severe in optical.

• Bulletin of the Korean Chemical Society
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• 제26권10호
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• pp.1533-1538
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• 2005

We have determined the contents of monosaccharides in the hydrolysates of some yogurt and orange juice products by derivatizing monosaccharides with p-aminobenzoic acid ethyl ester (ABEE). The separation of the ABEE-derivatized monosaccharides was efficiently carried out by HPLC using a microcolumn packed with the Alltima $C_{18}$ stationary phase. The concentrations of monosaccharides were determined based on the measured peak area/height counts. ABEE derivatization of fructose and its detection have never been successfully carried out before this work. In this study, two peaks were observed in a fixed ratio for ABEE-fructose, and the ratio was maintained over a wide range of fructose concentration. In order to prove the validity of the above method, we compared the concentrations of glucose, galactose and fructose determined by ABEE derivatization and UVD (ultraviolet detector) chromatography with those determined by RID (refractive index detector) chromatography without derivatization. The determined concentrations of monosaccharides obtained from the two chromatographic methods were found close to each other within acceptable error ranges.

• Earthquakes and Structures
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• 제7권4호
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• pp.449-462
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• 2014

Seismically induced structural damage, as well as any damage caused by a natural catastrophic event, covers a wide area. This suggests to supervise the event consequences by vision tools. This paper reports the evolution from the results obtained by the project RADATT (RApid Damage Assessment Telematics Tool) funded by the European Commission within FP4. The aim was to supply a rapid and reliable damage detector/estimator for an area where a catastrophic event had occurred. Here, a general open-source methodology for the detection and the estimation of the damage caused by natural catastrophes is developed. The suitable available hazard and vulnerability data and satellite pictures covering the area of interest represent the required bits of information for updated telematics tools able to manage it. As a result the global damage is detected by the simple use of open source software. A case-study to a highly dense agglomerate of buildings is discussed in order to provide the main details of the proposed methodology.

• Journal of Radiation Protection and Research
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• 제36권1호
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• pp.35-43
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• 2011

The PHENIX Experiment is the largest of the four experiments that have taken data at the Relativistic Heavy Ion Collider. PHENIX, the Pioneering High Energy Nuclear Interaction eXperiment, is designed specifically to measure direct probes of the collisions such as electrons, muons, and photons. The primary goal of PHENIX is to discover and study a new state of matter called the Quark-Gluon Plasma. Among many particles, muons coming from W-boson decay gives us key information to analyze the spin of proton. Resistive plate chambers are proposed as a suitable solution as a muon trigger because of their fast response and good time resolution, flexibility in signal readout, robustness and the relatively low cost of production. The RPC detectors for upgrade were assembled and their performances were evaluated. The procedure to make the detectors better was optimized and described in detail in this thesis. The code based on ROOT was written and by using this the performance of the detectors made was evaluated, and all of the modules for north muon arm met the criteria and installation at PHENIX completed in November 2009. As RPC detectors that we made showed fast response, capacity of covering wide area with a resonable price and good spatial resolution, this will give the opportunity for applications, such as diagnosis and customs inspection system.

• 센서학회지
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• 제14권4호
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• pp.272-277
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• 2005

A CMOS active pixel sensor has been designed and fabricated using standard 2-poly and 4-metal $0.35{\mu}m$ CMOS processing technology. The CMOS active pixel sensor has been made up of a unit pixel having a highly sensitive PMOSFET photo-detector and electronic shutters that can control the light exposure time to the PMOSFET photo-detector, correlated-double sampling (CDS) circuits, and an 8-bit two-step flash analog to digital converter (ADC) for digital output. This sensor can obtain a stable photo signal in a wide range of light intensity. It can be realized with a special function of an electronic shutter which controls the light exposure-time in the pixel. Moreover, this sensor had obtained the digital output using an embedded ADC for the system integration. The designed and fabricated image sensor has been implemented as a $128{\times}128$ pixel array. The area of the unit pixel is $7.60{\mu}m{\times}7.85{\mu}m$ and its fill factor is about 35 %.

• 한국방사선학회논문지
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• 제3권1호
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• pp.17-21
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• 2009

최근 의료진단 분야와 다른 적용분야를 위해 대면적 매트릭스 구조의 엑스선 영상이 활발하게 연구되어 오고 있다. 본 연구에서는, 의료진단을 위한 새로운 평판형 디지털 엑스선 가스 검출기를 제안하고 그에 따른 특성을 검증하고자 한다. 대기압에 반해 가스를 주입하는 어려움 때문에 챔버 형태의 구조로 만들어 질 뿐, 평판형 디지털 엑스선 가스 검출기는 아직 어디에서도 연구된 바 없다. 이에 본 연구에서는 디스플레이 패널 제작 기술을 이용하여 샘플제작을 성공하였다. 실험적인 측정을 위해 만들어진 샘플은 상판에는 유리기판위에 전극, 절연층, 산화마그네슘 보호막을 형성하였으며, 하판에는 엑스선 형광층과 전극을 형성하였다. 누설전류와 엑스선 민감도를 측정하였으며, 전기장에 대한 민감도의 선형성 측정 등의 전기적 특성평가를 실시하였다. 이에 대한 결과로 안정된 누설전류와 엑스선 민감도를 얻었다. 그리고 조사 선량에 따라 좋은 선형성을 보이는 등 넓은 진단 동적영역을 확인할 수 있었다. 이러한 결과로 평판형 엑스선 가스 검출기의 디지털 엑스선 영상 검출기로의 적용 가능성을 확인 할 수 있었다.