http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Telcordia SR-332 Issue 2를 이용한 신뢰성 예측
이덕규(Duck-Kyu Lee),심중호(Jung-Ho Shim) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Wide range of methodology of reliability prediction for system exists. For railway field, MIL-HDBK-217F, which has not been revised since early in 1990, is used for reliability prediction if historical data is not available. Since this standard has been published, quality and performance of electronic products have been improved rapidly and various kinds of items have been released, however new versions of items could not be released because the prediction standard could not follow up the speed of the production. Thus, this thesis introduces Telcordia SR-332 Issue 2 and would like to compare and analyze the result from MIL-HDBK-217F together with some cases we performed.
MWPECVD에 의한 박막의 합성과 방사선 검출 특성에 관한 연구
구효근(Hyo-Geun Koo),이덕규(Duck-Kyu Lee),송재흥(Jae-Heung Song),노경석(Kyung-Suk Noh),박상현(Sang-Hyun Park) 대한방사선과학회(구 대한방사선기술학회) 2004 방사선기술과학 Vol.27 No.2
방사선검출기에 시용되는 다이아몬드는 그 비저항이 10^12[Ωm]로 ao우 크기 때문에 고전압 하에서도 누설전류가 매우 작아 실리콘과 달리 p-n 접합을 하지 않고 바로 고전압을 걸 수 있는 이점이 있다. 또한 절연파괴 전압이 매우 크기 때문에 이동속도가 포화되는 전압까지 올릴 수 있다. 이 결과 다이아몬드 내에서의 전하 이동속도는 실리콘의 최대속도보다 약 20배 정도 빠르다. 200[㎛] 두께의 박막을 통해 전하가 모두 수집되는 시간은 불과 1[ns] 정도이다. 이상과 같이 독특한 다이아몬드의 성질을 이용하여 방사선검출기에 사용되는 물질로 파고계수형 전리조나 분광계, 열형광선량계, 형광검출기 그리고 핵방사선검출기 등에 사용된다. 본 연구에서는 마이크로파 플라즈마 CVD법으로 CH₄-H₂-O₂계로부터 몰리브덴기판 위에 100시간 동안 성장시킨 결과 약 100[㎛]의 두께를 가진 결정성이 좋은 방사선검출기용 다이아몬드막을 성장시킬 수 있었고, X-선 방사선량에 따른 방사선검출기의 전류파형을 측정한 결과 방사선량에 따라 전류가 증가됨을 알 수 있었다. Synthesis diamond films have been deposited on the molybdenum substrates using an microwave plasma enhanced chemical vapor deposition method. The effects of deposition time, surface morphology, infrared transmittance and Raman scattering have been studied. Diamond deposited on molybdenum substrate for 100 hours by MW plasma CVD from CH₄ - H₂ - O₂ gas mixture had good crystallity with 100[㎛] thickness needed for radiation detector. Diamond radiation detector of M-I-M type was made and the current of radiation detector was increased by increasing X-ray dose.
심중호(Shim, Jung-ho),정문(Jeong, mun),정수웅(Jeong, su-ung),이덕규(Lee, duck-kyu) 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11
A rolling stocks has variously enlarged passenger train, subway, KTX, magnetic levitation propulsion train, monorail train, even computer controlled train, etc.. The faster a railroad rolling stock is developed, the more important ESA(Electric/Electronic Sub Assembly) is brought into relief. Now, the test for ESA is over 90% among vibration tests for railroad rolling stocks. However, mechanism-centered vibration tests are performed in the stage of development although ESA is very important. About electronic sub assembly that is a part of ESA, the comparing results from sine wave vibration test by decuple of KS standard and random wave vibration test by decuple of IEC standard, which are applying most among internal and external vibration standards for train, are arranged and analyzed because that is the reason why this study is started and planed out. That the present thesis become a beginning, which vibration standards for train include not only mechanism-centered vibration tests but also ESA vibration tests, and is made the most of by reference when the vibration test standards are revised, is hoped.
백영구(Baek Young-Gu),송기태(Song Kee-Tae),김민호(Kim Min-Ho),이기서(Lee Key-Seo),신건영(Shin Keon-Young ),이덕규(Lee Duck-Kyu) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The importance of reliability and safety, recently, shows a tendency to increases in railway system constructions and projects. At the point of view of safety, especially, the railway authority proposes an establishment of the safety case that is the documented demonstration that products comply with the specific safety requirements in railway industry. In case of reliability activities, there is no systematic documented demonstration in the railway industry. At this circumstance, this study presents the establishment of Reliability, Availability and Maintainability Case for railway system based on the MoD(Ministry of Defence) 00-42. This RAM Case will support that systems and products produced from suppliers or manufacturers meet the specific RAM requirements during the system life cycle(i.e, from design to operation & maintenance) through systematic process and evidences. Also, it is expected that railway system operations will be managed and supported from reliability activities in accordance with RAM Case.
이덕규,강호조 한국수의공중보건학회 2002 예방수의학회지 Vol.26 No.2
The present study was carried out to investigate the effect of low dose X-irradiation (0.1∼1.5 Gy) on the frequency of pyknosis and micronuclei in leukocytes in mice. For observation of pyknosis and micronuclei in leukocytes, blood smears were performed, then stained with Hematoxylin-Eosine. The frequencies of pyknosis and micronuclei cells were observed under microscopic field. The frequency of pyknotic leukocytes with degeneration, disintegration and dark-stained nuclei was signifantly high in groups of 0.5, 1.0 and 1.5 Gy irradiation (P<0.05, P<0.001 and P<0.0001, respectively), compared with the control. The occurrence of micronuclei of leukocytes was also significantly high in groups of 1.0 Gy (P<0.05) and 1.5 Gy irradiation (P<0.05) compared with the control. These results suggest that the irradiation with 0.5∼1.5 Gy damaged to leucocytes in a dose-dependent manner.