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SOA내부의 XPM 효과를 이용한 새로운 구조의 대용량 광 셀 역압축기
엄진섭,안상호 강원대학교 정보통신연구소 2000 정보통신논문지 Vol.4 No.-
In this paper, a new type of Optical Cell Decompressor is proposed that made up of SOA and SAGNAC interferometer. This structure using XPM effect in SOA can overcome the majority of difficulties inhere in other structures, such as dependence on optical component tichnology, degradation of extinction ratio, increase of system hardware. Also, it has high linearity with respect to data signal input power, and shows low cross-talk, since the impact of the data signal on SOA gain and refractive index change is negligible. And low noise figure is obtained from very low ASE noise at the signal wavelingth, and negligible intensity modulation of the transmitted data signal is induced because of small gain change in the signal band.
안상호,엄진섭,박경태 강원대학교 정보통신연구소 1998 정보통신논문지 Vol.2 No.-
In this paper, we analyzed system performance parameters of analog optical transmission link for WLL and fabricated the optical transmitter and receiver satisfying system requirements. Transmitter consists of LD driver, ATC, and APC circuit, and receiver includes photodetector and amplifier circuit. Center frequency of RF carrier is set to 2.0 GHz for various applications such as WLL, PCS, etc. Return loss is measured for impedance matching and system performance of transmitter and RF output power is compared with RF input power to measure the total optical link loss. Amplifiers are used for loss compensation. From the measured system performance data, -14 dB return loss and 40 dB CNR is achieved.
1kHz 파장 스위핑 속도를 갖는 SS-OCT 시스템 구현
안상호,엄진섭 강원대학교 정보통신연구소 2009 정보통신논문지 Vol.13 No.-
In this paper, a SS-OCT(Swept Source Optical Coherence Tomography) system has realized using a wavelength swept ring laser at 1 kHz sweeping speed. Through the measurement of 2-dimensional image for a 1mm-thickness glass and an onion, as sample objects, 75nm wavelength tuning range and 1kHz wavelength sweeping rate has demonstrated.
SS-OCT 시스템 적용을 위한 FDML 방식의 고속 파장가변링 레이저 구현
안상호,엄진섭 강원대학교 정보통신연구소 2009 정보통신논문지 Vol.13 No.-
In this paper, we have demonstrated a Fourier Domain Mode-locked wavelength swept laser for SS-OCT system. The proposed FDML ring laser is constructed by long fiber ring cavity, a semiconductor optical amplifier, and a tunable fiber Fabry-Perot filter. Effective sweep rate of up to 123kHz(forward 61.5kHz, backward 61.5kHz) is demonstrated with a 10.53μm axial resolution and a 75nm tuning range at 1340nm center wavelength.
임철수,류정호,엄명도,황진우,김예은 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
Diesel engines which emit a lot of PM and NOx have been known as a main air polluter. Especially, diesel particulate matters (DPM) including black smoke are hazardous air pollutants to human health and environment. The nations retaining advanced engine technologies have reinforced emission regulations. To meet these regulations diesel engine manufacturers have developed low-emission diesel engines, aftertreatment equipments, alternative fuel technologies and so on. In this study, particle number concentrations characteristics according to particle size and engine driving conditions were analyzed when these low-emission technologies were applied. There was a tendency of increasing particle number concentrations from heavy-duty diesel engines with increasing engine rpm and load rate. In the cases of CDPF (Catalytic Diesel Particulate Filter), CNG (Compressed Natural Gas) engine and ULSD (Ultra Low Sulfur Diesel) more than 99% of particle number concentration were removed.
광궤환 알고리즘을 적용한 새로운 구조의 대용량 광 셀 압축기 및 역압축기 구현
김광복,안상호,엄진섭,박기오 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
In this paper, we proposed a new type of the Optical Cell Compressor and Decompressor, which are essential functional modules in TDM and TDM/WDM Hybrid Optical ATM Switch structure. The proposed structure drastically lessens hardwares for realization, using applied optical feedback algorithm in the compressing and decompressing. Also, it is possible to compress and decompress the large capacity optical pulse stream under the situation of multi-stage connection. We specified the systematic application through 4-bit compressing experiment with the single module for the proposed optical cell compressor.
윤순강,김원일,김진호,김선종,고문환,엄기철 한국환경농학회 2002 한국환경농학회지 Vol.21 No.4
본 연구는 동진강 유역의 수질 보전을 위한 기초자료를 얻기 위하여 동진강 본류와 이에 유입되는 정읍천을 대상으로 2001년 5월부터 11월까지 수질 모니터링을 실시하였다. 동진강 본류의 수질은 BOD기준으로 상수원 Ⅱ~Ⅳ등급(2.84~6.45 ㎎/L)으로 지점별로는 DJ6(정읍천 합류후)이 4.07㎎/L로 높게 나타나 Ⅲ급수의 수질을 유지하였다. COD는 지점별로 11.20~32.96 ㎎/L의 범위로 정읍천 합류후의 농도가 32.96 ㎎/L로 가장 높게 나타나 정읍천을 통한 본류의 오염물질량의 증가를 알 수 있었다. T-N의 경우 4.16~5.84 ㎎/L의 범위로 유역 전반에 걸쳐 오염이 이루어지고 있는 것으로 나타났고, T-P의 경우 BOD, COD와 마찬가지로 정읍천 합류후가 0.19 ㎎/L로 타 지점에 비하여 놀게 조사되었다. 본류의 COD의 경우 장마후 갈수기에 높은 농도를 나타냈고, T-P의 경우는 하천의 유량이 증가하는 홍수기보다 장마전 갈수기의 오염정도가 높고 이후 장마후 갈수기로 갈수록 수질이 악화되는 것으로 조사되었다. 동진강 수질의 오염은 주로 하류로 갈수록 그 정도가 심하게 나타나는데, 이것은 정읍천을 통해 유입되는 도시 생활하수와 인근 공장단지의 산업폐수가 그 주 요인으로 오염물질(BOD, COD T-N 및 T-P)의 농도가 상승하는 주원인이 되고 있다. 따라서, 동진강 수계의 수질관리를 위해 주 오염원이 되고 있는 정읍천의 도시생활하수와 공장단지에서 방류되는 산업폐수의 제어에 대한 대책이 먼저 이루어져야 할 것으로 판단된다. Irrigation water quality along Donjin river watershed was monitored to find a possible pollutants, for maintaining water quality to achieve food safety through water quality preservation of river. As a pollution indicators, such as Biological Oxygen Demand(BOD), Chemical Oxygen Demand(COD), Total Nitrogen(T-N), and Total Phosphate(T-P) in Dongjin river were examined from May to November in 2001. The results were as follows : The BOD level of Dongji n river ranged from 2.84 to 6.45 mg/L, which would be in a Ⅱ~Ⅳ grade of the potable water criteria by Ministry of Environment. Averaged BOD level of downstream DJ6(After Jeongupcheon confluence) was 4.07 mg/L. The average COD level of Dongjin river ranged from 11.20 to 32.96 mg/L. COD level of DJ6 rapidly increased rapidly after the junction of Dongjin river and Jungupcheon because it showed the latter had relatively high pollution level. T-N content were significantly high in all sites of Dongjin river ranged through 4.16 to 5.84 mg/L. T-P examined high concentration than another thing point by 0.19 mg/L after Jeongupcheon confluence as BOD and COD. COD of main stream was expressed high concentration to dry season after rainy season. In case of T-P, pollution degree of dry season before rainy season appeared and examined that quality of water was worsened go by dry season after rainy season. The water quality of Dongjin river was deteriorated with inflow of Jungupcheon polluted by municipal and industrial sites near Jungup city.
Eom, Ji-Ho,Choi, Hyung-Jin,Pammi, S. V. N.,Tran, Van-Dang,Kim, Yun-Jeong,Kim, Hye-Jin,Yoon, Soon-Gil The Royal Society of Chemistry 2018 Journal of materials chemistry. C, Materials for o Vol.6 No.11
<P>Chemical vapor deposited CH3NH3PbI3 (MAPbI3) thin films showed a long-term stability of approximately one month after exposure to air at room temperature. Self-powered sensors using 500 nm-thick MAPbI3 films were demonstrated for pressure and light sensitive bimodal sensor applications. The generated output voltage was attributed to an intrinsic piezoelectric property of the MAPbI3 films and their sensitivities for sensors were approximately 8.34 mV kPa<SUP>−1</SUP> and 0.02 nA kPa<SUP>−1</SUP>. The output current generated in the release mode showed a strong dependence on the light power irrespective of the applied pressure, revealing the light-sensitive effect of the MAPbI3 films. The response time of bimodal sensors for applied pressure and light power was approximately 0.066 and 0.320 s at an applied pressure of 30 kPa, respectively. The CVD-MAPbI3 films have attracted attention for simultaneous realization of both pressure and light sensitive bimodal sensor applications.</P>