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AWG의 파장교차특성과 광스위치를 이용한 WDM 시스템의 다채널 주파수 안정화
김광복,엄진섭,이정렬 강원대학교 정보통신연구소 1998 정보통신논문지 Vol.2 No.-
In this paper, we propose a novel multichannel frequency stabilization control scheme of semiconductor lasers, that uses the optical switches, wavelength crossover properties of an AWG, micro-processor and logarithmic amplifiers. The advantages of this scheme are that do not depend on the change of input power level and accommodate more channels simultaneously. Furthermore it can allow narrower channel spacing than the proposed scheme already.
링 레이저를 위한 새로운 광대역 파장 가변 필터에 대한 연구
김광유,이정렬,엄진섭 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
In this paper, we proposed the new wavelength tunable filter for wide tunability of fiber ring laser. The proposed filter consists of the cascaded connection of Fiber Reflection Mach-Zehnder Interferometer and Sagnac filter or of hybrid filter and Fiber Reflection Mach-Zehnder Interferometer. The simulation shows that the continuous tunable range of 50nm can be obtained and that more stable single mode operation of ring laser can be expected due to narrow FWHM. of filter spectrum.
링 레이저를 위한 새로운 광대역 파장 가변 필터에 대한 연구
김광유,이정렬,엄진섭 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
In this paper, we proposed the new wavelength tunable filter for wide tunability of fiber ring laser. The proposed filter consists of the cascaded connection of Fiber Reflection Mach-Zehnder Interferometer and Sagnac filter or of hybrid filter and Fiber Reflection Mach-Zehnder Interferometer. The simulation shows that the continuous tunable range of 50nm can be obtained and that more stable single mode operation of ring laser can be expected due to narrow FWHM. of filter spectrum.
하악대구치의 치성감염으로 유발된 안외골막하농양의 치험례
김동률,최동주,홍광진,이정구 大韓顎顔面成形再建外科學會 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1
A 61-years old man with diabetes mellitus (DM) was admitted to our hospital, complaining of progressive right periorbital swelling, headache and toothache on the right lower second molar. On the first visit, moderate swelling was noticed from the right periorbital region with exophtalmos and subconjunctival effusion. Intraorally, right lower second molar had a severe periodontal disease and fistular formation on its distal area. From 3 days after hospitalization, the visual acuity of his right eye was gradually worsen and we performed CT scan. CT scan demonstrated an inflammatory change at the right orbit with subperiosteal abscess at the inferior orbital wall, which was extended from the right infiratemporal, parapharyngeal and internal pterygoid space. Patient was treated by mean of intraoral (right upper vestibular and retromolar) and extraoral(infraorbital) incision and drainage, massive anti-therapy and DM control. The patient improved gradually and finally was discharged from the hospital, but his visual loss of right side was not recovered.
상악골절단술 후 외전신경마비를 동반한 경동맥 해면정맥돌루
이원학,김동률,홍광진,이정구 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.2
Carotid cavernous sinus fistula(CCSF) is an abnormal communication at the base of the skull between the internal carotid artery and the cavernous sinus. Fistula is almost associated with extensive facial trauma as a result of direct or indirect forces. Most fistulas of traumatic origin develop as a result of fractures through the base of the skull, which cause the laceration of the internal carotid artery near the cavernous sinus. The signs and symptoms of CCSF are pulsating exophthalmosis, orbital headache, pain, orbital or frontal bruit, loss of visual acuity, diplopia and ophthalmoplegia. Angiography reveals a definite CCSF and a detachable balloon embolization is known to be the treatment of choice. Even though carotid cavernous sinus fistula is an uncommon complication after orthognathic surgery, several cases of CCSF due to congenital anomalies, pre-existing aneurysms and abnormally thickened maxillary posterior wall have been reported in the literature. We have experienced a case of CCSF after Le Fort I osteotomy for maxillary advancement in skeletal class III patient and the cause, pathogenesis, diagnosis and treatment of this case.
GMAHN 환경에 적응하는 에러 복구기능을 이용한 AODV 라우팅 프로토콜
정찬혁,오세덕,배진승,이기원,장양근,이광배,김현욱,유충렬,하재승 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-
Mobile nodes in ad hoc mobile networks typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper proposes a solution that allows mobile nodes to access the wired Internet and to roam from base station to base station. And we also develop the efficient method that adapts in Global MANET which can be changed over time. It is observed that we can reduce not only error detection time but also network load, thus increasing the data reception rate in Global MANET Environment.
김정일,김병권,김정원,채창호,이철호,강동묵,김지홍,김진하,김영욱,이영하,이지호,김정호,윤형렬,유철인,정백근,장태원,김운규,윤동영,강진욱,김종은,안진홍,이동준,장준호,이광영,송혜란,최영희,이용환,조병만,최홍렬,고상백,김은아,이유진,홍영습,정갑열,김정만,김준연 大韓産業醫學會 2004 대한직업환경의학회지 Vol.16 No.1
Objective: Occupational medicine specialists in the Busan, Ulsan and Kyung-Nam areas established an area-based occupational disease surveillance system and used this system to collected case information for the purpose of preventing occupational diseases Methods: l l hospital participated in this system. The authors selected five main diseases, which were hand-arm vibration syndrome (HAVS), work-related musculoskeletal disorder (WRMSD), occupational asthma, occupational skin disease and occupational and occupational lung cancer and established their case definitions. All cases were reported on the web, and real time analysis was conducted. Results: Between April 2001 and April 2003, 192 cases of HAVS, 118 cases of WRMSD, 33 cases of occupational asthma, 17 cases of occupational skin disease and 17 cases of occupational lung cancer (for a total of 377 cases of these five main diseases) were reported. most of the HAVS cases came from shipbuilding, and 172 of them (92.7%) were associated with grinding. Of the four main types of WRMSD, carpal tunnel syndrome (CTS) was the most prevalent with 46 cases and shipbuilding was also the main industry involved (83.9%). The ergonomic risk factors involved mainly associated with the hand. In 19 (57.6%) and 4 (12.1%) cases of occupational asthma, the agents involved. The causative agents of occupational lung cancer included Cr, welding fume, PAH, Ni, etc. 10(58.8%) of the cases were diagnosed as squamous cell carcinoma and 5(29.4%) as adenoma. Conclusion: This result showed that an area-based occupational disease surveillance system might provide an effective method of evaluating the prevalence of such diseases, however the Busan, Ulsan and Kyung-Nam provinces are too large to be treated as individual areas. Therefore, the authors suggest that each province should establish its own surveillance system.
Ovarian Development and Vitellin of the Mushroom Fly, Lycoriella mali(Diptera: Sciaridae)
Kim, Seong-Ryul,Park, Kwang-Ho,Yang, Won-Jin,Kim, Iksoo,Jin, Byung-Rae,Sohn, Hung-Dae Korean Society of Applied Entomology 2000 Journal of Asia-Pacific Entomology Vol.3 No.1
Ovarian development and vitellin of the mushroom fly, Lycoriella mali, were characterized. L. mali has a pair of ovaries, composed of 50-60 ovarioles, respectively. Ovarian development began at 1 day of pupation, and continued to become mature at 2 days after adult emergence. The vitellogenin (Vg) and vitellin (Vn) of L. mali were identified by native - and SDS-PAGE analyses. The Vn is composed of two subunits with a large subunit, L-Vn(190 kDa), and a small subunit, S-Vn (63kDa), respectively. These two subunits of Vn gradually decreased in content during embryogenesis. We confirmed the presence of the Vg and Vn which were first detected in the 3 day-old female pupae by SDS-PAGE and Western blot analyses. It can be assumed that the Vn is synthesized as a precursor (Vg) in the fat body at 3 days after pupation and released into hemolymph. Then, the Vg is subsequently absorbed into the ovary at the same time. Twelve amino acid residues after the signal peptide at the -N-terminus of .mali S-Vn were sequenced and showed 80% homology to those of Anthonomus grandis vitellogenin.