• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.149-152
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• 2004

A new joint source channel coding reduces both input-width and average current consumption to transmit image data to LCD source drivers. As a source coding, it is based on entropy coding of differential pulse code modulation scheme, especially using median edge detector of image predictor. As a channel coding, it is not a simple pulse amplitude modulation, but linked by source entropy to reduce average amplitude. Simulation results show 1/4 width is achievable by 16-valued transmission with keeping conventional current consumption (0.36 to 1.3).

• Journal of Nutrition and Health
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• 제15권1호
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• pp.15-21
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• 1982

In this work, the quantitative estimation of fatty acids in sesame and perilla oil by high performance liquid chromatography (HPLC) was investigated. The analysis of fatty acids were separated by HPLC using a differential refractometer as a detector. With micro Bondapak $C_{18}FFAA$ column and acetonitril, chloroform and tetrahydrofuran mixture as a solvent. In the fatty acid compositions, sesame oil was composed mainly of linoleic and oleic acids 49.6 % and 34.7%. In perilla oil, the amounts of oleic, linoleic and linolenic acids were 13.6%, 14.5% and 63.8%, respectively.

• 약학회지
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• 제23권3_4호
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• pp.181-186
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• 1979

A high performance liquid chromatograpic procedure is described for determining ginseng saponins such as ginsenoside-Rb1, -Rb2, -Rc, -Rd, -Re, -Rf, -Rg1, and-Rg2. Ginseng saponins extracted with 90% methanol and water-saturated butanol were compared with pure standard ginsenosides. The resolution of the saponins was satisfactory and detection limit for each saponin was about 5.mu.g. Separation of the saponins was accomplished using a .mu. Bondapak carbohydrate analysis column, mobile phase of acetonitrile-water-butanol (80:20:15) and differential refractive index (RI) detector. The reproducibility and the recovery were also studied. This method was applied for determining the saponin contents of several parts of leaf, fresh ginseng, white ginseng, and red ginseng.

• 한국통신학회논문지
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• 제7권1호
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• pp.37-45
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• 1982

육상 移重무선통신상에 있어서 2相 DPSK 방식에 대한 가우스 잡음과 多重路 동일주파 간섭파의 영향에 관해 이론해석을 행했다. 해석방법으로서는 多重통신로는 비선택성 Rayleigh통신로로 간주, DPSK 검파기 출력의 確率密度雨數를 유도하여, DPSK방식의 수신誤率의 일반식을 구했다. 수치해석 결과로서 반송파대 잡음전력비(CNR)의 변화에 따른 수신誤率를 반송파대 간섭파전력비(CIR)와 희망신호의 상관계수를 파라메타로 하여 그림으로 나타내고 이를 분석, 검토했다.

• 한국기계가공학회지
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• 제4권4호
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• pp.34-38
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• 2005

This is a widespread requirement for low cost lightweight thermal imaging sensors for both military and civilian applications. Today, a large number of uncooled infrared detector developments are under progress due to the availability of silicon technology that enables realization of low cost IR sensor. System prices are continuing to drop, and swelling production volume will soon drive process substantially lower. The feasibility of micromechanical optical and infrared (IR) detection using microcantilevers is demonstrated. Microcantilevers provide a simple Structurefor developing single- and multi-element sensors for visible and infrared radiation that are smaller, more sensitive and lower in cost than quantum or thermal detectors. Microcantilevers coated with a heat absorbing layer undergo bending due to the differential stress originating from the bimetallic effect. This paper reports a micromachined silicon uncooled thermal imager intended for applications in automated process control. This paper presents the design, fabrication, and the behavior of cantilever for thermomechanical sensing.

• JSTS:Journal of Semiconductor Technology and Science
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• 제8권4호
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• pp.277-282
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• 2008

A fully integrated inductorless CMOS impulse radio ultra-wideband (IR-UWB) receiver is implemented using $0.18\;{\mu}m$ CMOS technology for 3-5 GHz application. The UWB receiver adopts the non-coherent architecture, which removes the complexity of RF architecture and reduces power consumption. The receiver consists of inductorless differential three stage LNA, envelope detector, variable gain amplifier (VGA), and comparator. The measured sensitivity is -70 dBm in the condition of 5 Mbps and BER of $10^{-3}$. The receiver chip size is only $1.8\;mm\;{\times}\;0.9\;mm$. The consumed current is 15 mA with 1.8 V supply.

• 한국전자파학회논문지
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• 제11권3호
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• pp.365-371
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• 2000

본 논문에서는 무선광연결에서 편광판을 이용하여 잡음광을 소거하는 방법에 대하여 소개한다. 잡음광을 소거하기 위한 차동검출기에 편광판을 사용하면 잡음소거능력이 향상된다. 또한 유사한 파장을 가진 두 개의 광신호가 공간에 첩되어 혼싱이 발생하는 경우에는 각각의 수신부에 편광판을 서로 수직으로 부착하면 각각의 광신호를 쉽게 분리 검출할 수 있다. 이 방법은 매우 간단하여 사용하기가 쉽다.하기가 쉽다.

• Current Optics and Photonics
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• 제5권2호
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• pp.129-133
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• 2021

This study observed the performance of an InAs/GaSb type-II superlattice photodiode with a p-i-n structure for mid-wavelength infrared detection. The 10 ML InAs/10 ML GaSb type-II superlattice photodiode was grown using molecular beam epitaxy. The cutoff wavelength of the manufactured photodiode with Si3N4 passivation on the mesa sidewall was determined to be approximately 5.4 and 5.5 ㎛ at 30 K and 77 K, respectively. At a bias of -50 mV, the dark-current density for the Si3N4-passivated diode was measured to be 7.9 × 10-5 and 1.1 × 10-4 A/㎠ at 77 K and 100 K, respectively. The differential resistance-area product RdA at a bias of -0.15 V was 1481 and 1056 Ω ㎠ at 77 K and 100 K, respectively. The measured detectivity from a blackbody source at 800 K was calculated to be 1.1 × 1010 cm Hz1/2/W at zero bias and 77 K.

• 센서학회지
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• 제4권4호
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• pp.62-69
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• 1995

1차원 MWPC(Multiwire Proportional Chamber)를 이용한 디지탈 X-선 사진촬영장치를 개발하였다. X-선의 입사위치 정보는 각각의 양극선에 증폭기, 판별기및 계수기를 연결하여 얻는다. 각각의 판별기에는 판별전압을 독립적으로 설정하여 검출기의 계수율 균일성을 향상시켰으며 미분형비선형값은 ${\pm}4%$이었다. 노화효과를 방지하기 위하여 기체유입형으로 제작하였으며 검출기체로는 비교적 값싼 P10기체를 사용하였다. 양극선 간격이 2mm일때 검출기체의 압력을 증가시킴으로써 위치분해능이 약 1.4mm인 우수한 특성을 얻었다. 피사체를 수직방향으로 스캐닝하여 $32{\times}32$화소의 영상을 었었다.

• 센서학회지
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• 제23권5호
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• pp.342-348
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• 2014

This paper introduced a novel multi-gas sensor detector with simple signal processing algorithm. This device was evaluated by investigating the characteristics of combustible materials using fire-generated smell and smoke. Plural sensors including TGS821, TGS2442, and TGS260X were equipped to detect carbon monoxide, hydrogen gas, and gaseous air contaminants which exist in cigarette smoke, respectively. Signal processing algorithm based on the difference of response times in fire-generated gases was implemented with early and accurately fire detection from multiple gas sensing signals. All fire experiments were performed in a virtual fire chamber. The cigarette, cotton fiber, hair, polyester fiber, nylon fiber, paper, and bread were used as a combustible material. This analyzing software and sensor controlling algorithm were embedded into 8-bit micro-controller. Also the detected multiple gas sensor signals were simultaneously transferred to the personnel computer. The results showed that the air pollution detecting sensor could be used as an efficient sensor for a fire detector which showed high sensitivity in volatile organic compounds. The proposed detecting algorithm may give more information to us compared to the conventional method for determining a threshold value. A fire detecting device with a multi-sensor is likely to be a practical and commercial technology, which can be used for domestic and office environment as well as has a comparatively low cost and high efficiency compared to the conventional device.