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成昌煥,徐祥烈 영남이공대학 1997 論文集 Vol.26 No.-
The results obtained from undrained torsional shear test for saturated sand lead to the following conclusions. 1. In the case of monotonic undrained torsional shear test, the more loose sand has, the more maximum excessive pore water pressure happens on a large scale. At that time, large shear strain happens. Also, in the case of one directional monotonic load, there is some possibility for a liquefaction to happen. 2. In undrained cyclic torsional shear test, if strain begins to generate, a loose sand comes to the liquefaction. In a dense sand, the behaviour of a rapid increase of strain is not shown. 3. According to the result compared constant volume test and undrained test, a difference of increased amount of pore water pressure by unloaded process in both tests is a little large. If the liquefaction strength is judged from increase of pore water pressure, loading number in the former is decreased by about 40%.
강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2
Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.
참여자 의사결정 성향을 고려한 요구성능 기반의 QFD 평가방법 및 설계변경 프로세스
김상우(Kim, Sang-Woo),신창현(Shin, Chang-Hyun),조재호(Cho, Jae-Ho),서상욱(Suh, Sang-Wook),전재열(Chun, Jae-Youl) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.2
It is a essential element of decision-making problem on design quality management and change process. Domestic design quality management has a major problem such as Methods/Materials/Systems selection error, insufficient design features caused by inadequate design review, and qualitative decision making process. It is due to lacks of comprehensive review of method in design solutions, insufficient of understanding of stakeholder requirements, and rely on technicians" empirical experience. Therefore, this study is fucus on change management that is to determine type of decision-making model with the ranking importance of the needs of project stakeholder. In addition, a decision-making method is proposed to evaluate function, performance based on required performance criteria. The QFD-RPC(Quality Function Deployment based on the Required Performance Criteria) can be shared information of function features between participants and check its importance. And also, it is to evaluate the importance ranking of the function, and then to analysis corresponding its performance and required performance criteria, finally to review the suitability whether the defined quality satisfy product" performance compared to the required criteria. Design project can be reduced unnecessary change through the QFD-RPC assessment with a quantitative measurement for design quality.
Roh, Ki-Min,Suh, Chang-Youl,Oh, Jung-Min,Kim, Wonbaek,Kwon, Hanjung,Lim, Jae-Won Elsevier 2014 Powder technology Vol.253 No.-
<P><B>Abstract</B></P> <P>Low oxygen content TiNi alloy powder was produced from TiNi alloy scraps by three types of deoxidation after the hydrogenation–dehydrogenation (HDH) process. The TiNi alloy scrap had a Ti:Ni weight ratio of 7:3. After the HDH process, the TiNi alloy powder was found to comprise <I>α</I>-Ti and Ti<SUB>2</SUB>Ni phases. It was also confirmed that the hydrogenation process of Ti–Ni alloy showed lower exothermal temperatures than that of pure Ti. After the process of contact deoxidation in the solid state, the oxygen content of the TiNi alloy powder was 1980ppm. This deoxidized powder was treated again by the non-contact deoxidation process as a result of which the oxygen content decreased further to 1260ppm. Applying only non-contact deoxidation after the HDH process allowed us to obtain an oxygen content of 1280ppm, which is the same as that of the TiNi alloy powder obtained by both the contact and the non-contact deoxidation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low-oxygen-content powder was produced from TiNi alloy scraps. </LI> <LI> Three types of deoxidation after hydrogenation–dehydrogenation were applied. </LI> <LI> Main phases of the alloy powder prepared from the scraps were <I>α</I>-Ti and Ti<SUB>2</SUB>Ni. </LI> <LI> Minimum oxygen-content of TiNi powder was 1260ppm. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hard X-ray free-electron laser with femtosecond-scale timing jitter
Kang, Heung-Sik,Min, Chang-Ki,Heo, Hoon,Kim, Changbum,Yang, Haeryong,Kim, Gyujin,Nam, Inhyuk,Baek, Soung Youl,Choi, Hyo-Jin,Mun, Geonyeong,Park, Byoung Ryul,Suh, Young Jin,Shin, Dong Cheol,Hu, Jinyul Springer Science and Business Media LLC 2017 Nature photonics Vol.11 No.11
<P>The hard X-ray free-electron laser at the Pohang Accelerator Laboratory (PAL-XFEL) in the Republic of Korea achieved saturation of a 0.144 nm free-electron laser beam on 27 November 2016, making it the third hard X-ray free-electron laser in the world, following the demonstrations of the Linac Coherent Light Source (LCLS) and the SPring-8 Angstrom Compact Free Electron Laser (SACLA). The use of electron-beam-based alignment incorporating undulator radiation spectrum analysis has allowed reliable operation of PAL-XFEL with unprecedented temporal stability and dispersion-free orbits. In particular, a timing jitter of just 20 fs for the free-electron laser photon beam is consistently achieved due to the use of a state-of-the-art design of the electron linear accelerator and electron-beam-based alignment. The low timing jitter of the electron beam makes it possible to observe Bi(111) phonon dynamics without the need for timing-jitter correction, indicating that PAL-XFEL will be an extremely useful tool for hard X-ray time-resolved experiments.</P>
土木分野 職務分析을 通한 實驗實習 敎育의 改善에 關한 硏究
李紀夫,成昌煥,尹海植,徐祥烈 영남이공대학 산업기술연구소 1987 産業技術硏究 Vol.1 No.-
This study is a description for improvement of experiment and practice education of Department of civil engineering through job analysis. The result of this study can be summerized as follows. 1. First of all we set up the educational goal of the junior college in Korea, Strengthened the elementary course of civil engineering and tried to be an education fit for the construction site. 2. EDPS (Electronic Data Processing System) for civil works was strengthened in the newly proposed curriculum. 3. In consideration of the social position of the technicians the new curriculum was stablished.
Zr<sub>57</sub>V<sub>36</sub>Fe<sub>7</sub>게터합금의 수소흡수특성에 미치는 분쇄의 영향
박제신,서창열,심건주,김원백,Park, Je-Shin,Suh, Chang-Youl,Shim, Gun-Choo,Kim, Won-Baek 한국재료학회 2006 한국재료학회지 Vol.16 No.2
The effects of milling time in argon and hydrogen atmospheres on the hydrogen sorption speed of a getter alloy, $Zr_{57}V_{36}Fe_{7}$, was studied. The hydrogen sorption speed of milled alloys was evaluated at room temperature. In argon, as the oxygen content increased with milling time, the hydrogen sorption speed decreased accordingly. In hydrogen, on the other hand, the oxygen content decreased at first with milling time but started increasing after 5 hrs of milling time. Similar to the case of argon, however, the hydrogen sorption speed changed exactly in the opposite direction with the oxygen content, exhibiting the maximum rate at 5 hrs. These results suggest that in both atmospheres the hydrogen sorption speeds are inversely related with the oxygen contents.
다방향 불규칙파중의 인장계류식 해양구조물의 구조응답 해석
이수룡(Soo-Lyong Lee),서규열(Kyu-Youl Suh),이창호(Chang-Ho Lee) 한국항해항만학회 2007 한국항해항만학회지 Vol.31 No.8
다방향 불규칙파 중에서의 인장계류식 해양구조물(TLP)의 구조응답 해석을 수행함으로써 다방향 불규칙파가 구조응답에 미치는 영향을 평가하고 있다. 인장계류식 해양구조물에 작용하는 파강제력과 동유체력은 3차원 특이점분포법을 사용하여 각각의 외각요소에 대해 평가하였다. 3차원 골조요소로 모델링하여 유한요소법에 의해 구조응답을 평가하였으며, 인장계류식 해앙구조물의 각 외각요소간의 유체역학적 상호간섭을 고려하여 구조응답을 해석하였다. 구조응답의 주파수 응답함수와 다방향파의 스펙트럼을 이용하여 다방향 불규칙파에 대한 해양구조물의 구조응답 스펙트럼을 구하여 다방향 불규칙파가 인장계류식 해양구조물의 구조응답에 미치는 영향을 평가하였다. A numerical procedure is described for estimating the effects of the multi-directional irregular waves on the structural responses of the Tension Leg Platform (TLP). The numerical approach is based on a three dimensional source distribution method for hydrodynamic forces, a three dimensional frame analysis method for structural responses, in which the superstructure of TLP is assumed to be flexible instead of rigid. Hydrodynamic and hydrostatic forces on the submerged surface of a TLP have been accurately calculated by excluding the assumption of the slender body theory. The hydrodynamic interactions among TLP members, such as columns and pontoons, and the structural damping are included in structural analysis. The spectral description used in spectral analysis of directional waves for the linear system of a TLP in the frequency domain is sufficient to completely define the structural responses. This is due to both the wave inputs and responses are stationary Gaussian random process of which the statistical properties in the amplitude domain are well known. The numerical results for the linear motion responses and tension variations in regular waves are compared with the experimental and numerical ones, which are obtained in Yoshida et al.(1983). The results of comparison confirmed the validity of the proposed approach.
게터용 Zr<sub>57</sub>V<sub>36</sub>Fe<sub>7</sub> 합금의 수소 흡수특성에 미치는 비정질화의 영향
박제신,서창열,김원백,Park Je-Shin,Suh Chang-Youl,Kim Won-Baek 한국재료학회 2005 한국재료학회지 Vol.15 No.12
The hydrogen sorption speeds of $Zr_{57}V_{36}Fe_7$ amorphous alloy and its crystallized alloys were evaluated at room temperature $Zr_{57}V_{36}Fe_7$ amorphous alloy was prepared by ball milling. The amorphous alloy was crystallized through two stages. Initially, $\alpha-Zr$ solid solution was appeared from the amorphous phase. Two cubic Laves compounds were precipitated afterwards from the remained amorphous and from excessively saturated solid solution at higher temperature. The hydrogen sorption speed of the partially crystallized alloy was higher than that of amorphous. The enhanced sorption speed of partially crystallized alloy was explained in terms of surface oxygen stability which has been known to retard the activation of amorphous alloys. The retardation could be reduce by crystallization process resulting in the observed increase in sorption property.