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전광섬유형 $2{\times}32$ 스프리터 제작과 이를 이용한 Ethernet PON 시스템의 상향통신채널 성능평가
장진현,김준환,신동호,Jang, Jin-Hyeon,Kim, Jun-Hwan,Shin, Dong-Ho 한국정보통신설비학회 2005 정보통신설비학회논문지 Vol.4 No.2
All-optical fiber-type $2{\times}32$ splitters for an Ethernet PON (passive optical network) were fabricated by using a FBT (fiber biconical tapered) process and the performance of the splitters was tested in upstream transmission of the EPON system. The $2{\times}32$ splitters was obtained by cascading $1{\times}4$ splitters fabricated by a conventional FBT process and showed -18 dB of insertion loss with 1.5 dB uniformity of output power at each channel and -0.1 dB of polarization dependent loss. The insertion loss variation was below 0.1 dB at the temperature range of $-40^{\circ}C\;to\;80^{\circ}C$. For upstream channel transmission test in the EPON system were a Zig board and a burst mode receiver. Zenko-made optical module was used for the burst mode receiver by adding functions of serializer/deserializer and clock data recovery, a Virtex II pro20 chipset and Vitesse VSC7123 were used in the Zig board for characterizing the burst mode and in the clock data recovery chipset, respectively. Startup acquisition lock time and data acquisition lock time were measured to be 670ns and 400ns, respectively, in the upstream channel transmission of the EPON system adapting the $2{\times}32$ splitter fabricated in this work.
바이러스성 출혈성 패혈증 바이러스(Viral Hemorrhagic Septicemia Virus) 감염 넙치(Paralichthys olivaceus)의 조직별 바이러스 정량분석
장진현,황성돈,정지민,권문경,황지연,Jang, Jin Hyeon,Hwang, Seong Don,Jung, Ji Min,Kwon, Mun-Gyoung,Hwang, Jee Youn 한국환경생물학회 2021 환경생물 : 환경생물학회지 Vol.39 No.3
국내외에서 80여 종이 넘는 담수 및 해산어류를 감염시켜 대량폐사를 발생시키는 바이러스성 출혈성 패혈증 바이러스(VHSV) 진단검사를 위해 넙치의 여러 조직의 바이러스 발현량에 대한 정량적 데이터를 시간순서에 따라 분석하였다. 무작위 선별된 넙치에 3.0E+07 TCID<sub>50</sub> per 0.1mL per fish의 VHSV를 복강 주사하여 시간순서(0시간, 6시간, 12시간, 1일, 2일, 3일, 5일, 7일)에 따라 조직(아가미, 간, 신장, 비장, 근육)을 채취하였다. Real-time PCR 법을 통해 상대 정량한 결과 5일차 아가미, 간, 신장, 비장에서 바이러스의 발현량이 가장 높게 나타났다. 이번 연구를 통해 감염 초기단계에서 비장이 VHSV 확정진단을 위한 적정조직임을 입증하였으며, 국내 법정전염병 진단에 중요한 정보를 제공할 것이다. A diagnostic test for viral hemorrhagic septicemia virus (VHSV), which infects more than 80 species of freshwater and marine fish at home and abroad, causing mass mortality, was conducted to provide quantitative data on the amount of virus expression in various tissues of flounder in chronological order. The tissues were collected in chronological order after the intraperitoneal injection of 3.0E+07 tissue culture infective dose<sub>50</sub> (TCID<sub>50</sub>) per 0.1mL per fish of VHSV to randomly selected flounder. As a result of relative quantification through real-time PCR, the highest levels of virus expression were found in the spleen, kidney, gill, and liver on day 5. This study proved that the spleen was an appropriate site for the final diagnosis of VHSV in the early stages of infection and will provide important information for the diagnosis of legal infectious diseases in Korea.
Enzyme-linked immunosorbent assay를 이용한 바이러스성 출혈성 패혈증 바이러스 감염 넙치(Paralichthys olivaceus)의 특이 항체반응 검사
황지연,장진현,김동준,권문경,서정수,황성돈,손맹현,Hwang, Jee Youn,Jang, Jin Hyeon,Kim, Dong Jun,Kwon, Mun Gyeong,Seo, Jung Soo,Hwang, Seong Don,Son, Maeng-Hyun 한국수산과학회 2017 한국수산과학회지 Vol.50 No.5
The viral hemorrhagic septicemia virus (VHSV) has an extensive host range, and infects farmed and wild fish inhabiting both freshwater and marine ecosystems. Enzyme-linked immunosorbent assay (ELISA) is highly useful in diagnosing viral hemorrhagic septicemia. However, ELISA shows high, non-specific background reaction with fish antibodies. In this study, we optimized the antigen and antibody concentrations used for detecting specific antibodies in VHSV-infected olive flounder to reduce non-specific binding, and improve the sensitivity of ELISA. The results suggested that OD (optical Density) values were valid when ELISA was performed with $0.1{\mu}g/well$ of virus, involving blocking with blocking buffer (Roth, Roti-Block), 1:300-1:600 dilution with flounder antisera, and 1:1000 dilution with anti-flounder IgM and HRP-conjugated goat anti-mouse IgG for detecting the VHSV antibody in flounder sera. Furthermore, 11 different VHSV strains isolated in Korea from 2012 to 2016 were used to infect the fish. The results showed no correlation between viral pathogenicity and antibody production. This research is a basic study on the application of antibody detection in the diagnosis of viral hemorrhagic septicemia in the olive flounder.
정종래,장진현,손용환,이창원,정진호,Jung, Jong-Rae,Jang, Jin-Hyeon,Son, Yong-Hwan,Lee, Chang-Won,Jung, Jin-Ho 한국전기전자학회 1999 전기전자학회논문지 Vol.3 No.1
기존의 광통신 시스템을 DWDM에 사용할 경우, 인접 채널사이의 간격이 좁아 심한 간섭이 발생한다. FBG 필터를 사용하여 DWDM에서의 이러한 인접 채널간 간섭은 줄일 수 있다. 따라서, 본 논문에서는 균일한 경우, 가우시안 apodized 경우, 상승-코사인 apodized 경우의 세가지 굴절을 변화에 대한 반사 스팩트럼을 구하였다. 본 논문에서 얻어진 결과로 부터, 균일한 FBG는 적합하지 않고, 최대 굴절을 변화량 ${\sigma}$ 가 작을수록, 상승-코사인 apodized FBG 인 경우 변수 C 가 클수록, 가우시안 apodized FBG 인 경우 변수 G가클수록 DWDM용 협대역 필터에 적합함을 알 수 있었다. 또한, 상승-코사인 apodized FBG는 더 좁은 반사 스펙트럼 대역과 더 낮은 사이드로브를 갖기 때문에 가우시안 apodized FBG보다 더 우수한 특성을 갖음을 알 수 있었다. When the current optical communication system is used for the DWDM, it raise the serious interference because an interval between the adjacent channels is narrow. The FBG filter for the DWDM is able to reduce the interferences between the adjacent channels. In this paper, therefore, we find the reflection spectrums for the three types of induced index changes, that is, uniform, Gaussian apodized, and raised-cosine apodized. From the obtained results in this paper, we can see that uniform FBG does not fit, and that the smaller the maximum induced index change ${\sigma}$ is and the larger the value of parameter C in the raised-cosine apodized FBG and G in the Gaussian apodized FBG are, the fitter they are on the narrow filter for DWDM. But, we can also see that the raised-cosine apodized FBG has more excellent property than the Gaussian apodized FBG because it has the narrower maximum reflection spectrum band and the lower sidelobes than the other.
건설기계용 가변용량형 피스톤 펌프 레귤레이터의 EPPR 밸브를 이용한 선형, 비선형 압력제어 모델링 비교분석
정헌술(Heon-Sul Jeong),장진현(Jin-Hyeon Jang) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
Normally hydraulic piston pumps are controlled by a mechanical type regulator consisted of springs and valves, but construction of the mechanical regulator is very complicated, Hence nowadays electro-hydraulic regulators are emerging to overcome poor control performance, difficult adjustment work and limited control functionality. This paper focuses on the pressure control of a electro-hydraulic type regulator using EPPR valve for a variable displacement swash plate type piston pump. First of all, PI Pressure controller is constructed and Simulink and AMESim simulation models for those mathematical models are developed. Comparison results of the hydraulic pump characteristics response and pressure control performance depending on the complexity of the simulation models are discussed and some conclusions are given.