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      • 광섬유 지연선로를 이용한 3-비트 광 실시간 지연선로

        이백송,신종덕,김부균 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

        In this paper, we propose an optical true time-delay (TTD) feeder system for phased array antennas (PAAs), which consists of a fixed wavelength laser diode, 2×2 MEMS (Micro-Electro-Mechanical System) switches, and fiber delay lines. A 3-bit TTD for 10 ㎓ PAAs with two antenna elements has been implemented and the time delay difference between the antenna elements has been measured for all the possible beam radiation angles according to the combination of MEMS switches setup. Experimental results are in excellent agreement with calculated ones.

      • 초 광대역 광 증폭기용 광역 파장 필터 개발에 관한 연구

        황현용,신종덕 崇實大學校 1999 論文集 Vol.29 No.1

        We present the simulation results of the S-band(1480-1520nm) and M-band(1530-1570nm) filters for ultra-broadband optical amplifiers. The bandpass filters are multi-layer dielectric films directly deposited on the fiber end-face. Transmittance spectra are obtained with the characteristic matrix method. In the design, the total number of film layers is 35 and the half wavelength thickness is used at the 6th, 18th, and 30th layers for both filters. Simulation results show that the 3-dB bandwidth and the maximum ripple of the S-band filter are 35.8nm and 0.13dB, and those of the M-band filter are 37.1nm and 0.13dB, respectively.

      • 광섬유 브래그 격자를 이용한 온도/스트레인 센서

        평재협,신종덕 崇實大學校 1999 論文集 Vol.29 No.1

        Fiber Bragg grating(FBG) has become a key passive device for applications in fiber-optic communications. It also has a great potential in a wide range of sensing applications for the measurement of strain, temperature, pressure, etc. In this paper, we report experimental results on a temperature/strain sensor composed of a bare FBG and a solder-clad FBG connected in cascade. Since the Bragg wavelength of the solder-clad FBG does not change with strain and its sensitivity is four times as large as that of the bare FBG up to 110℃, it was used to measure temperature. On the other hand, strain information was obtained from the reflection wavelength difference between the two FBGs.

      • 큐의 크기가 WDM 슬러티드 링 통신망의 시간지연에 미치는 영향

        이창진,신종덕 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

        In this paper, we propose a WDM slotted ring network, in which each node is equipped with a fixed receiver, a tunable transmitter, a tunable receiver, and a buffer. We investigated the effect of buffer size on the performance for the network and found out that proper selection of queue size could drastically reduce the delay of network.

      • 실시간 지연선로를 사용한 위상배열 안테나의 지향성 향상에 관한 연구

        배덕희,신종덕,김부균 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

        In this paper, We proposed a novel true time-delay(TTD) for phased array antennas(PAAs) using fiber Bragg gratings(FBGs) and metal films deposited on fiber ends. This structure requires fewer number of FBGs and provides relaxed wavelengh selection than the previous TTDs using only FBGs. A 10 ㎓ PAA system with the proposed TTD has been fabricated to show that the measured time delay difference for each steering angle is less than ±1ps compared with the calculated one. Dolph-Tschebyscheff array method was used to improve the directivity for a 10 ㎓, four element PAA incorporating the proposed TTD. Simulation results showed that the ratio of the main lobe to the first side lode for the case of Dolph-Tschebyscheff array is 16.2 dB greater than that for the case of uniform array.

      • Optical true time-delay feeder for phased array antennas using fiber Bragg gratings and metal-film reflectors

        Shin, Jong-Dug,Bae, Duk-Hee,Kim, Boo-Gyoun Wiley Subscription Services, Inc., A Wiley Company 2005 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Vol.45 No.2

        <P>A novel optical true time-delay (TTD) feeder for phased-array antennas incorporating a fiber Bragg grating (FBG) prism and optical fibers with metal film deposited on their cleaved ends is proposed. By arranging a metal-film reflector at one end of the fiber delay line with FBGs written at different locations, one FBG for every fiber delay line can be saved (compared to FBG-only TTD feeders) and flexibility of wavelength selection is also provided due to the uniform reflectance of the metal film in a broad wavelength range. A TTD feeder with two fiber delay lines for 10-GHz linear phased-array antennas is built to steer a beam into three directions at 0° and ±30°. The experimental results of the time delays agree well with those calculated at all the steering angles. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 122–124, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20743</P>

      • Plastic Optical Fiber Refractive Index Sensor Employing an In-Line Submillimeter Hole

        Jong-Dug Shin,Jaehee Park IEEE 2013 Photonics Technology Letters Vol.25 No.19

        <P>An in-line submillimeter hole fabricated by micro-drilling plastic optical fiber (POF) directly has been proposed as a compact refractive index sensor. Since the hole behaves as a concave lens if it is filled with a liquid having lower refractive index than that of the fiber core, transmittance increases in proportion to the refractive index. Analysis of the sensor transmittance has been performed using a simple ray optics model. Through immersing a 1.5-mm POF with a 0.35-mm-radius hole into various liquids, transmittance of the sensor has been measured at 670 nm. It has been shown that the experimental and analytical results are in excellent agreement.</P>

      • 一家族 3名에 온 선천성안구진탕증

        심완섭,이종원,지선득 충남대학교 의과대학 지역사회의학연구소 1976 충남의대잡지 Vol.3 No.2

        Congenital nystagmus is a well-established clinical entity with strong hereditary characteristics in which the causes of the nystagmus is not known: in general the eyes are objectively normal. Electronystamography is mandatory for the examination of a patient with nystagmus to take accurate record and reasonable analysis. Treatment is very difficult and not available in all patients. Three brothers with congenital nystagmus in one family is reported and a brief review of literature is described.

      • KCI등재

        OBS 네트워크의 OAM 기본 체제

        신종덕,Shin Jong-Dug 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.1B

        OBS (Optical Burst Switching) 네트워크에 관한 연구가 최근 활발히 진행되고 있으나 OBS 네트워크 운용에 필수적인 OAM (Operation md Maintenance)에 대한 연구는 아직 다루어지고 있지 않다. 본 논문에서는 다섯가지 OBS 기능들, 즉 BT (Burst Termination), BTX (Burst Transmission), BSW (Burst Switching), RSC(Routing and Switching Control), 그리고 PAR (Protection and Restoration)을 정의하였고, 이 기능적 모델에 근거하여 네트워크 운용 요구 조건들을 만족시키기 위한 OAM 아키텍처를 설계하였다. 또한, OAM 수행에 필요한 OAM 동작들의 정의와 OAM이 가능한 ingress 에지, 코어, egress 에지 노드들의 구조, 그리고 OAM 정보 및 통신 모델과 프로토콜 등과 같은 OAM 구현을 위한 기본 체제를 제안하였다. 그리고, 제안된 OAM 아키텍처를 이용하여 OBS 네트워크에서 발생 가능한 여러 가지 장애들에 대한 OAM을 정리하였다. Operation and maintenance (OAM) in optical burst switching (OBS) networks has not yet been addressed even though OBS has been gaining research interest in recent years. In this paper, we defined five OBS functions such as Burst Termination (BT), Burst Transmission (BTX), Burst Switching (BSW), Routing and Switching Control (RSC), and Protection and Restoration (PAR). A functional model for OBS networks and an OAM architecture are designed to meet the operational requirements. We present the first framework to realize OAM in OBS networks, including OAM activities, OAM-capable OBS nodes such as ingress edge, core, and egress edge nodes, OAM information and communication models and protocols. A number of examples of possible network failures are pointed out and the corresponding reactions to these using the proposed OAM architecture are presented.

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