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김경조,김진균,강성식,정명조 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
The Korea Institute of Nuclear Safety, as a representative organization of Korea, in February 2012 participated in an international Program to Assess the Reliability of Emerging Nondestructive Techniques initiated by the U.S. Nuclear Regulatory Commission. The goal of the Program to Assess the Reliability of Emerging Nondestructive Techniques is to investigate the performance of emerging and prospective novel nondestructive techniques to find flaws in nickel-alloy welds and base materials. In this article, Korean roundrobin test results were evaluated with respect to the test blocks and various nondestructive examination techniques. The test blocks were prepared to simulate large-bore dissimilar metal welds, small-bore dissimilar metal welds, and bottom-mounted instrumentation penetration welds in nuclear power plants. Also, lessons learned from the Korean roundrobin test were summarized and discussed.
김경조,손남선,김준휘,오민철,Kim, Kyung-Jo,Son, Nam-Seon,Kim, Jun-Whee,Oh, Min-Cheol 한국광학회 2011 한국광학회지 Vol.22 No.4
근적외선 대역에서 동작 가능한 가변파장레이저 구현을 위하여 브래그 격자와 반도체 광증폭기로 구성된 외부 공진기 형태의 레이저를 제작하였다. 폴리머 광도파로는 굴절률이 1.462, 1.435 인 ZPU 폴리머를 이용하여 제작되었다. 근적외선 파장에서 반사를 일으키는 브래그 격자의 제작을 위해서는 주기가 875 nm 로서 비교적 크고 제작이 손쉬운 3차 브래그 격자를 이용하였다. 폴리머 광도파로 브래그 반사기를 이용하여 제작된 근적외선 외부공진 레이저는 850 nm 파장에서 0 dBm의 출력 파워와 0.2 nm의 20-dB bandwidth, 40 dB 이상의 Side Mode Suppression Ratio을 가지는 단일 모드 레이저 특성을 보였다. An external cavity laser operating at near infrared wavelength is demonstrated by incorporating polymer waveguide Bragg reflectors. 3rd order Bragg grating and oversized rip waveguide structure were designed by using the effective index method and the transmission matrix method. The polymer waveguide was fabricated using polymer materials with refractive indices of 1.462 and 1.435 for the core and the cladding layers, respectively. The external feedback laser with 875-nm Bragg grating exhibits single mode lasing located at 850-nm wavelength with an output power of 0 dBm, a 20-dB bandwidth of 0.2 nm and a side mode suppression ratio of 40 dB.
체외충격파 쇄석술을 이용한 췌관 결석의 치료 후에 발생한 위점막하 종양을 의심하게 한 위벽내 혈종
김경조,이성구,김명환,서동완,이상수,민영일 대한소화기내시경학회 2005 Clinical Endoscopy Vol.30 No.3
위벽내 혈종은 매우 드문 질환으로 유전적인 혈액응고장애에 의해서 발생하는 경우가 가장 흔하며, 그 밖의 원인으로는 복부 외상, 위궤양, 내시경 시술과 관련된 손상, 그리고 부주의에 의한 이물질 연하 등에 의한 손상 등이 보고된 바 있다. 그러나 만성 췌장염에 합병된 췌관 결석의 치료로 체외충격파 쇄석술을 시행한 후에 발생한 위벽내 혈종은 국내에서 아직 보고된 예가 없다. 이에 저자 등은 췌관 결석을 체외충격파 쇄석술로 성공적으로 제거한 후 지연 발생한 위벽내 혈종을 문헌고찰과 함께 보고 하는 바이다. Gastric intramural hematoma is a very rare disease entity. There is no reported case of gastric intramural hematoma in Korea following the extracorporeal shockwave lithotripsy (ESWL). Most have been associated with hereditary coagulopathy, but abdominal trauma, peptic ulceration, and inadvertent ingestion of foreign bodies have been listed as etiologic agents. This is the first description of a case of gastric intramural hematoma simulating gastric submucosaltumor, which regressed spontaneously, following ESWL in a patient with pancreatic duct stones.
초음파 비선형 전파특성을 이용한 부분 열화 재료의 평가
김경조,장경영,야마와키히사시,Kim, Kyung-Cho,Jhang, Kyung-Young,Hisashi, Yamawaki 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
In this paper, the nonlinear behavior of ultrasonic wave in partially degraded material is considered. For this aim, FDM(finite difference method) model for the nonlinear wave equation was developed with the restriction to the 1-D longitudinal wave motion and how the partial degradation in material contributes to the detected nonlinear parameter was analyzed quantitatively. In order to verify the rightness of this simulation method, the relation between the detected nonlinear parameter and the continuous distribution of degradation obtained from simulation was compared with experiment results and the simulation and experiment results showed similar tendency. It can be known from simulation result that the degree of degradation, the range of degradation and the continuous distribution of degradation have strong correlation with the detected nonlinear parameter. As it was possible in these simulations that only special part is assumed as degraded one, the quantitative evaluation of partially degraded material may be obtained by using this method.
김경조,강성식,신호상,송명호,정해동,김용식 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
After several PWSCCs were found in Bugey(France), Ringhals(Sweden), Tihange(Belgium), Oconee, Arkansas, Crystal Fever, Davis-Basse, VC Summer(U.S.A.), Thuruga(Japan), USNRC and PNNL started the research on PWSCC, that is, the PINC project. USNRC required KINS to participate in the PINC project in May 2005. KINS organized the Korean consortium at March 2006 and Pre-RRT for RVHP were performed for the preparation of PINC RRT. Through these preliminary RRT, Korea NDE teams can learn and develop the detection and sizing technique for RVHP dissimilar metal weld. These techniques are now being prepared in Korea and need to be utilized for the In-service inspection of the RVHP and BMI of Korea Nuclear Power Plants. PINC RRT mock-ups will be helpful to training.
김경조,김진겸,김동열,정명조,김종범 한국비파괴검사학회 2019 한국비파괴검사학회지 Vol.39 No.5
Damage to buried piping is one of the important issues facing the nuclear power industry. Unlike an above-ground pipe, buried piping is exposed to a corrosion environment because of the water chemistry condition inside the pipe, and to mechanical damage, chemical damage, and heavy-load fatigue caused by the soil outside the pipe. If leakage occurs in buried piping, it is very difficult to find its cause and to repair it in a timely manner. In Korea, after the leakage has been identified, follow-up measures are implemented, such as temporary repair or maintenance. Therefore, the identification of potential damage, which is part of the integrity management of buried piping in soil and concrete, is fairly limited. Therefore, an effective buried-pipe aging management program that is applicable to Korean nuclear power plants and that includes the preventive management of damage is necessary. In this study, US regulation trends were identified through the regulatory requirements and the management documents of licensees to develop regulatory guidelines. Using these results, regulatory guidelines for buried and underground piping/tanks can be developed for the future in-service inspection and license renewal of Korean nuclear power plants. 매설배관 손상은 최근 원전 산업이 직면하고 있는 중요한 현안이다. 매설배관은 지상의 배관과 달리 내부 유체로 인한 부식, 외부 토양으로 인한 기계적, 화학적 손상, 그리고 중 하중에 의한 피로 등을 동시에 받고 있다. 매설배관에서 누설이 발생할 경우 원인을 찾기 어려울 뿐만 아니라 접근도 쉽지 않아 적절한 시기에 정비하기가 매우 어렵다. 현재 국내 매설배관 건전성 관리는 누설 확인 시, 위치를 파악하고 임시 보수 또는 경상 정비를 통하여 사후 처리를 진행한다. 그러므로 토양 또는 콘크리트에 매립된 매설배관의 잠재적인 손상 징후 파악과 이에 대한 건전성 평가를 수행하는 것은 상당히 제한적이다. 따라서 매설배관 손상에 대한 예방 관리를 포함한 효과적인 경년열화관리 프로그램 구축이 필요하다. 본 연구에서는 원전 매설배관 및 탱크에 대한 규제지침을 개발하기 위해 미국에서 적용되는 규제요건, 사업자 문서 등 매설배관 규제 현황을 파악하였다. 이 결과를 활용하여 국내 원전의 매설배관 가동중검사 및 계속운전 심사를 위한 규제지침을 개발할 예정이다.