http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조립식 경골잔교(Fish-bone Girder Pier)의 비틀림 거동분석을 통한 설계 시 고려사항
윤경민(Yun, Kyung-Min),윤기용(Yoon Ki-Yong),이진옥(Lee, Chin-Ok),임남형(Lim, Nam-Hyoung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.1
조립식 경골잔교는 Spine-girder인 단일거더 시스템이므로 휨 뿐만 아니라 비틀림에 큰 영향을 받는 구조물이 다. 본 연구에서는 경골잔교의 합리적인 설계를 위하여 설계 시 고려사항을 도출하고자 하였다. 거동분석을 위한 구 조해석 유한요소모델을 개발하고, 실험 결과와 비교하여 타당성을 검증하였다. 경골잔교의 거동분석을 통하여 국부적 인 과대응력 발생을 방지하기 위하여 Bone-beam 하단부에 보강재 설치가 필요하며, 플랜지의 법선응력은 비틂, 플 랜지와 웹의 전단응력은 순수비틂에 의한 영향이 지배적으로 작용하는 것을 확인하였다. A modular fish-bone girder pier consists of one main girder system named as “Spine Girder”. Therefore, this pier can be most affected by torsion as well as flexural bending. The design considerations of the fish-bone girder pier are proposed to assure the reasonable design in this study. In order to investigate the behavior characteristics, structural analysis F.E model is developed, and the verification of the developed model is performed by comparison with experimental data. From the investigation of the structural behavior, the vertical stiffener is required at the bottom of bone-beams to prevent the excessive local stress. Also, it is found that the normal stress of the flange and the shear stress of the web and flange are dominantly affected by the warping torsion and pure torsion, respectively.
Poly Vinyl Alcohol 몰드를 이용한 Nano Transfer Printing 기술 및 이를 이용한 Mo 나노 패턴 제작 기술
양기연,윤경민,한강수,변경재,이헌,Yang, Ki-Yeon,Yoon, Kyung-Min,Han, Kang-Soo,Byun, Kyung-Jae,Lee, Heon 한국재료학회 2009 한국재료학회지 Vol.19 No.4
Nanofabrication is an essential process throughout industry. Technologies that produce general nanofabrication, such as e-beam lithography, dip-pen lithography, DUV lithography, immersion lithography, and laser interference lithography, have drawbacks including complicated processes, low throughput, and high costs, whereas nano-transfer printing (nTP) is inexpensive, simple, and can produce patterns on non-plane substrates and multilayer structures. In general nTP, the coherency of gold-deposited stamps is strengthened by using SAM treatment on substrates, so the gold patterns are transferred from stamps to substrates. However, it is hard to apply to transfer other metallic materials, and the existing nTP process requires a complicated surface treatment. Therefore, it is necessary to simplify the nTP technology to obtain an easy and simple method for fabricating metal patterns. In this paper, asnTP process with poly vinyl alcohol (PVA) mold was proposed without any chemical treatment. At first, a PVA mold was duplicated from the master mold. Then, a Mo layer, with a thickness of 20 nm, was deposited on the PVA mold. The Mo deposited PVA mold was put on the Si wafer substrate, and nTP process progressed. After the nTP process, the PVA mold was removed using DI water, and transferred Mo nano patterns were characterized by a Scanning electron micrograph (SEM) and Energy Dispersive spectroscopy (EDS).
춘천시 (春川市) 도시 하수에 의한 의암호의 (衣岩湖) 수질오염에 관한 생물학적 조사 및 정화방안에 (淨化方案) 관한 연구
조규송,조동현,윤경민 ( Kyu Song Cho,Dong Hyun Cho,Kyung Min Yoon ) 한국하천호수학회 1978 생태와 환경 Vol.11 No.3·4
Physicochemical examination of waters and survey on the plankton and benthos in the lake Uiam were performed from March 1978 to December 1978. 1) The water temperature was not variable with depth except the summer stagnation period. 2) In the waters polluted directly from wastes of Chuncheon city (St. 3, 4), high concentration of Cl^-, NH₃-N and NO₂-N was recorded. 3) The fauna of plankton was subject to change under the influence from Chuncheon and Soyang reservoirs. The characteristic species of polluted places were Rotifers such as: Rotatoria spp., Conochilus unicornis, Poyarthra euryptera, Asplanchna priodonta, Asplanchna sp., Brachionus calycilorus, Br. calycilorus var. anuraeiformis, Bir. calycilorus var. amphiceros, Br. budapastinensis, Br. anqularis, Br. anqularis var. brevispinus, Br. urceolaris, Br. rubens; Br. plicatilis, Keratella cochlearis var. macrocantha, K. cochlearis var. tecta, K. valga f. asymmetrica, Anuraeopsis fissa, Argonotholca foliacea, Plathyios quadricornis, Monostyla sinuata, Filinia longiseta, Hexarthra mira, Pompholyx complanata, Ploesoma trunctum. 4) Dominancy of Chironomus in the upper stream of St. 2 and Tubifex in St. 4 seems to be depend upon the detritus of the lake. 5) For the maintenance of water quality it is worth while to construct a waste water refinery and a tributary pipe system. 6) It is recommended that no buildings should be constructed by the lake shore (Ex. zoning legistration for Wisconsin.)
TFA-MOD법으로 제조된 YBCO 박막의 습도분압 효과
장석헌,임준형,윤경민,이승이,김규태,이창민,주진호,나완수,이희균,홍계원,Jang, Seok-Hern,Lim, Jun-Hyung,Yoon, Kyung-Min,Lee, Seung-Yi,Kim, Kyu-Tae,Lee, Chang-Min,Joo, Jin-Ho,Nah, Wan-Soo,Lee, Hee-Gyoun,Hong, Gye-Won 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
We fabricated $YBa_2Cu_33O_{7-x}$(YBCO) films on(00l) $LaAlO_3$ substrates prepared by metal organic deposition(MOD) method using trifluoroacetate(TFA) solution and evaluated the effects of the humidity on the microstructure, phase purity, and critical properties. The films calcined at $430^{\circ}C$ were fired at $775^{\circ}C$ at 0%, 4.2%, 12.1%, and 20.0% humidified As gas mixed with 0.1% $O_2$. We observed that the amount of $BaF_2$ phase was effectively reduced and that a sharp and strong biaxial texture formed under a humidified atmosphere, leading to increased critical properties. For the films fired at 0% humidity, the $T_c\;and\;I_c$ were undetectably small. When the humidity was increased to 4.2%, the corresponding $T_c$(onset) and $I_c$ were increased to 90.5 K and 8 A/cm-width, respectively. For the films at the humidity range of 12.1-20.0%, the $I_c$ was found to be 35 A/cm-width. According to the results of the XRD, pole-figure, and SEM, these improved critical properties are probably attributed to the formation of a purer YBCO phase, larger grain size, and stronger c-axis orientation.
Young Bourn Shin(辛英範),Kyung Min Yoon(尹景民) 한국육종학회 1986 한국육종학회지 Vol.18 No.4
The morphological characteristics and chromosomal behaviour at meiosis were examined for the trisomics of the rice plants, which derived from the crosses between triploids and diploids of the cultivar, Gwanchul. The trisomic plants, having chromosome number of 2n=25 were classified into 8 groups on the basis of their morphological traits. The major morphological traits, vigorousity, growth habit, plant height, leaf color, panicle shape, spikelet size and percent seed setting. were significantly different each other among 8 trisomic groups. Among these morphological traits, the spikelet character, such as spikelet length and width, and their ratio of length / width, were considered to be useful criteria for the classification of trisomic types at maturity. Eight types of the trisomics could be classified into 3 groups according to chromosomal pairing configuration at first division of meiotic phrophase. Three trisomic types out of 8 trisomics showed higher frequency of trivalent pairing than that of univalent formation, and the other 3 trisomic types showed higher frequency of univalent formation than trivalent pairing. The remaining two trisomic types, among 8 trisomic groups, were observed as about same ratio in the univalent and trivalent formation.
경골형 교량거더의 비틀림에 의한 말뚝연결부 응력저감기법
김재형(Kim, Jae-Heong),윤경민(Yun, Kyung-Min),윤기용(Yoon Ki-Yong),이진옥(Lee, Chin-Ok),임남형(Lim, Nam-Hyoung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
조립식지그재그 형태의 단일거더시스템이 적용되는 경골형 교량은 비틀림에 취약한 구조이다.특히 거더와 PHC(PretensionedspunHighstrengthConcrete)말뚝의 고정 연결부는 비틀림 하중에 의한 과도한 응력이 집중되는 취약부 이므로 이를 저감시키기 위한 방안이 요구된다.본 연구에서는 연결부에 발생하는 과도한 응력을 저감시키기 위한 다양한 보강재 형식의 효율성을 수치해석적으로 평가하였다. A fish-bone type bridge is vulnerable to the torsional behavior due to the single girder system with planar zigzag conformation. The fixed connecting area between the girder and pier is the special weak point because the torsional load creates excessive stress concentration. Therefore, the method to reduce the stress concentration is required. In this study, the reduction efficiency of various reinforcing types to reduce the excessive stress occurring at the connecting area is evaluated by using numerical analyses.
TFA-MOD법에 의한 YBCO 박막의 열처리변수 효과
장석헌,임준형,김규태,이진성,윤경민,주진호,이희균,홍계원,Jang, Seok-Hern,Lim, Jun-Hyung,Kim, Kyu-Tae,Lee, Jin-Sung,Yoon, Kyung-Min,Joo, Jin-Ho,Lee, Hee-Gyoun,Hong, Gye-Won 한국초전도학회 2006 Progress in superconductivity Vol.7 No.2
We fabricated YBCO coated conductors (CCs) by TFA-MOD process and evaluated microstructure, texture formation, and critical temperature ($T_c$) and current ($I_c$). YBCO precursor solution was synthesized using metal-trifluoroacetates and dip coated on $LaAlO_3$(LAO) substrate. The phase formation and microstructure was characterized by X-ray diffraction and scanning electron microscopy (SEM) and the degree of texture was evaluated by pole-figure analysis. The CC was heat-treated in various calcining temperatures ($370^{\circ}C-460^{\circ}C$) and firing temperatures ($750^{\circ}C-800^{\circ}C$). As fired at $775^{\circ}C$ for 4h, the CC had the highest $T_c$ of 89.5 K and $I_c$ of 40 A/cm-width ($J_c=2.0\;MA/cm^2$). Microstructural observation indicated that the YBCO film was dense and homogeneous and had a strong cube texture without formation of second phase and its in-plane full-width at half-maxima; $5.2^{\circ}$ under optimum condition.
211 공정을 이용한 새로운 TFA-MOD YBCO 박막 선재 제조
임준형,장석헌,김규태,이진성,윤경민,박의철,주진호,Lim, Jun-Hyung,Jang, Seok-Hern,Kim, Kyu-Tae,Lee, Jin-Sung,Yoon, Kyung-Min,Park, Eui-Cheol,Joo, Jin-Ho 한국초전도학회 2006 Progress in superconductivity Vol.7 No.2
We fabricated the YBCO films on single crystal $LaAlO_3$ substrates via a metal organic deposition (MOD) process. In the process, $Y_2Ba_1Cu_1O_x$ and $Ba_3Cu_5O_8$ powders were dissolved in trifluoroacetic acid (TFA) followed by calcining and firing heat treatments. To evaluate the effects of the firing temperature on YBCO phase formation and critical properties, the films were fired at $750^{\circ}C,\;775^{\circ}C\;and\;800^{\circ}C$ after calcining at $430^{\cric}C$. Microstructure observation indicated that a crack-free surface formed and a strong biaxial texture was developed. The FWHM of out-of-plane texture was measured to be in the range of $4.3^{\cric}-7.0^{\circ}$ for all the films. When the YBCO film was fired at $775^{\cric}C$, it had the highest critical properties: 88.5 K of critical temperature and 16 A/cm-width of critical current ($1MA/cm^2$ as critical current density). On the other hand, those properties were degraded as firing at $750^{\circ}C\;and\;800^{\circ}C$. It is considered that the improved critical values are partly owing to dense and homogeneous microstructure, strong texture, and high oxygen content.