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MgCl₂溶液內에서 STS 304 HP Stainless Steel 熔接部의 破壞擧動에 對한 硏究
金永奭,丁太權,朴昌彦,洪錫柱,梁仁榮,金基玉,朴煥奎,李茂錫,曺圭宰,鄭在康 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-
This paper is based on an experiment analysing the stress corrosion cracking behaviour of welding specimens compared to that of non-welding specimens of STS 304 HP stainless steel in corrosion solution. As a corrosion condition, stainless steel has been known to be the most fragile in a solution of 42% MgCl₂heated to the boiling point, therefore the experiment was carried out in this condition. The experiment was carried out with argon gas TIG welding specimens and non-welding ones made of stainless steel plates, thickness 2mm, by tensile force. At this time, the tensile force was taken to be the value of the yield strength of the tensile test specimens divided by the safety factor of 3.0 to 3.5, 4.0, 4.5, and 5.0. In this paper, the relations between Time of Initial Crack, Time of Failure, Time of Final Fracture and Crack Propagation Length were investigated and then plotted. Furthermore, the relations between Stress Intensity Factor K proposed by Irwin and the Time of Initial Crack, the Time of Failure, the Time of Final Fracture were calculated and plotted. At the last, all the relations plotted were expressed to normal equations by computer, and the equations were used to analyse the data obtained in the experiment. The conclusions obtained in this study are as follows: 1. Welding materials, compared with non-welding ones, as the Time of Initial Crack, the Time of Failure, and the Time of Final Fracture were generally very fast, appeared to be a phenomenon of unstable brittleness fracture. 2. Non-welding materials, compared with welding ones, as the safety factor was larger or the working stress was smaller, appeared to be a phenomenon that the longer had had greater durability. Therefor, welding materials must be considered enough to be used in heate affected and stress corrosion atmosphere. 3. The normal equations of the Time of Initial Crack and the variation rate to the same Stress Intensity Factor K are as follows: (A) Non-welding T =259702.4-5451.2 K+28.386 K² T = -5451.2+28.386 K (B) Welding T= -332.693+28.043 K-0.211 K² T' =28.043-0.211 K here, T; Time of Initial Crack, T'; Variation Rate of Time of Initial Crack to Stress Intensity Factor K, K ; Stress Intensity Factor.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
무선 인지 환경을 위한 효율적인 동적 스펙트럼 활당 기법
김주석,김경석,박우구,김진업 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.2
무선 기술이 발달함에 따라 주파수 자원의 부족문제가 점점 심해지고 있고, 이를 해결하기 위해 주파수 공유기술로 무선인지 (cognitive radio: CR)가 부각되고 있다. 본 논문에서는 CR 기반의 IEEE 802.22 WRAN 환경에서 동적 스펙트럼 할당 (Dynamic Spectrum Allocation: DSA) 기법을 연구하였다. 주파수를 좀 더 효율적으로 공유하기 위해 Variable bandwidth, 이동성, 셀 간 간섭을 적용한 DSA 기법을 제시하고 시뮬레이션 결과들을 통해 이를 검증하였다. As a wireless technique advances, the shortage problem of frequency resource has been gradually serious. Cognitive radio(CR) have been noticed to solve this problem by using frequency sharing methods. We investigate dynamic spectrum allocation(DSA) method in IEEE 802.22 WRAN environment of CR foundation in this paper. To share frequency more efficiently, we propose some DSA techniques for variable bandwidth, mobility, intercell interference and verify these through the result of the simulations.
김주필(Joo-Pil Kim),예용택(Yong-Taek Ye),최한석(Han-Seok Choi),장지현(Jee-Hyeon Jang):예성훈(Seong-Hun Ye),김태우(Tae-Woo Kim),김대희(Dae-Hee Kim),지승환(Seung-Hwan Ji),이형민(Hyung-Min Lee),이형진(Hyung-Jin Lee) 한국거미연구소 2016 한국거미 Vol.32 No.2
2016년 8월 3일부터 5일까지 제주특별자치도 서귀포시 대정읍 마라도 일대를 한국거미연구회 하계 합동채집회에 김주필, 예용택, 최한석, 장지현, 예성훈, 김태우, 김대희, 지승환, 이형민, 이형진, 신정애, 허양미, 이영경, 최라미, 이윤정 등이 채집조사한 결과 15과, 39속, 45종의 거미류가 조사연구되어 이에 보고하는 바이다. The authors investigated the spiders of the Mara Island in Jeju Island. In the present paper 45 species of 39 genera belong to 15 families were identified. These specimens are deposited at the Joo-Pil Spider Museum, Namyangju-Si, Kyunggi-Do.
액체금속로 KALIMER의 가동중검사 및 보수 개념설계
주영상,김석훈,이재한 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.2
가동중검사와 보수는 원자력발전소의 원자로계통설계에서 매우 중요한 설계개념이다. 액체금속로 KALIMER의 가동성 검증을 위해서 기계계통 설계에 가동중검사와 보수개념이 반영되어야 한다. 본 연구에서는 KALIMER의 안전성과 신뢰성을 확보하기 위하여 KALIMER의 개념설계 단계에 필요한 가동중검사와 보수의 기본 개념을 설정하였다. 액체금속로 가동중검사 규정인 ASME Section ⅩⅠ Division 3를 반영하고 KALIMER의 설계특성을 고려하여 원자로계통과 주요부품의 가동중검사와 보수에 대한 방법과 요건을 설계하고 기술하였다. The design concepts of in-service inspection and maintenance are very important for the reactor system design of the nuclear power plant. The strategy of in-service inspection and maintenance should be reflected in the mechanical system design for the verification of the operability of liquid metal reactor KALIMER. In this paper the fundamental approaches of the in-service inspection and maintenance of the KALIMER are established to ensure the safety and reliability of the reacter system. The general method and requirement of the in-service inspection and maintenance for the reactor system and components are proposed and described to satisfy the intents of the ASME Section XI Division 3 and the design characteristics of KALIMER.