http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고윤석,홍대승 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.2
The research presented in this paper focuses on a method for the detection of High Impedance Fault(HIF). The method will use the Lifting and neural network system. HIF on the multi-grounded three-phase four-wires primary distribution power system cannot be detected effectively by existing over current sensing devices. These paper describes the application of lifting scheme to the various HIF data. These data were measured in actual 22.9kV distribution system. Wavelet transform analysis gives the frequency and time-scale information. The neural network system as a fault detector was trained to discriminate HIF from the normal status by a gradient descent method. The proposed method performed very well by proving the right state when it was applied staged fault data and normal load mimics HIF, such as arc-welder.
항결핵 치료과정에서 호전되었다가 악화된 뇌 결핵종 1예 보고
이대훈,유진홍,강미자,김홍기,김선화,고동훈,천지성,유원종 대한화학요법학회 1997 대한화학요법학회지 Vol.15 No.3
In spite of nationmide tuberculosis control program, tuberculosis is still prevalent in Korea. Accordingly, tuberculous meningitis also poses one of the main trouble some problems. Recently, We experienced a perplexing case of tuberculous menin-gitis and tubercdoma in a 24-year old female patient. She was admitted to our hospital owing to meningeal irritation sign, aphasia, VI nerve palsy, and ,fever. CSF analysis showed a finding consistent with that of presumptive tuberculous meningitis.. Initial MRI of the brain revealed a large mass(tuhercu1oma) on left parieto-temporal area. Antitubeculous regimen(1soniazid (INH), rifampin(RMP), ethambutol(EMB), pyrazinamide(PZA)} of meningeal dose was given immediately, and her symptoms and signs were dramatically disappeared with a few days after treatment. She was discharged with improved condition and under maintenance treatment of tuberculosis. Follow-up one year after treatment. revealed that the previous lesion was nearly diminished. She showed no symptom at all until she recognized a total blindness of sudden onset on her left eye a t the 18th month of treatment. Brain MRI checked at that time showed multiple masses of tuberculoma scattered over the brain base and one of them invaded left optic nerve. In our opinion, the cause of relapse in this patient might he explained by the selection and ultimate replication of a minor population of resistant strain. Although such relapse is an extremely rare event, we think that we should always pay attention to this possible resistance problem every time we meet patients with tuberculous meningitis.
김은하,최효직,고대홍 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2
Formations of TiSi₂ thin films by a solid state reaction between Ti thin films and Si substrates and the effects of the conditions of Si substrates have been investigated. Low-Resistant C54- TiSi films were formed by rapid thermal processes at 750℃ on the undroped Si (100) substrate, and at 800℃ on the As or B-doped Si (100) substrate as well as on As or B-droped poly-Si substrates. Cross-sectional TEM analyses confirmed the formation of small-grained C49 TiSi₂films by rapid thermal processes at 700℃ on pre-amorphized poly-Si substrate by As implantation. The temperatures of the transformation to the C5 phase decreased in small-grained C49- TiSi₂films. Finally, low resistant C54 TiSi₂thin films were selectively formed on gate, source, and drain regions by SALICIDE process with pre-amorphizaton of substrates. Microstructures and electrical properties of TiSi₂ film were investigated. Sheet resistance of TiSi₂ film on 1.2㎛-wide poly-Si gates was 3.8~4.2Ω/□, and XRD results showed phase formation of C54 TiSi₂ films.
Al6061 판재성형에서 핫 포밍 퀜칭의 성형성 및 기계적 특성 평가
고대훈(Dae Hoon Ko),김재홍(Jae Hong Kim),이찬주(Chan Joo Lee),고대철(Dae Cheol Ko),김병민(Byung Min Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.4
알루미늄 소재의 냉간 판재성형에서는 낮은 성형성과 성형 후 과도한 스프링백에 의한 치수정밀도가 저감되는 문제가 있다. 이에 본 연구에서는 기존 제조공법의 문제점을 개선하기 위해 새로운 제조공법인 Hot forming quenching(HFQ)을 제시하고자 한다. HFQ 은 용체화처리 온도로 가열된 알루미늄 판재를 열간성형하고, 다이 내에 설치된 냉각채널에 의해 퀜칭하여 열간성형과 열처리를 동시에 함으로써 성형성 향상, 스프링백 저감 효과를 얻을 수 있다. 기존의 냉간성형 대비 HFQ 의 성형성 향상효과를 에릭슨 시험을 통해 평가하였다. 스프링백 특성을 파악하기 위해 V-beding 시험에 HFQ 를 적용하여 굽힘 성형된 제품의 치수정밀도를 기존의 냉간성형과 비교하였다. 또한 강도 및 경도를 측정하여 기존 냉간 성형에 의한 값들과 비교함으로써 알루미늄 제품 성형에 HFQ 을 적용하기 위한 타당성을 평가하였다. In aluminum sheet metal forming, the conventional forming methods of T4 or T6 heat-treated sheets result in low formability and dimensional accuracy. This study suggests a new forming method for aluminum sheets called as hot forming quenching (HFQ) that solves the problems faced in the conventional method. HFQ combines the heat treatment and forming processes through the forming die during the quenching of a solid solution. To evaluate the application of HFQ to the sheet forming of aluminum, an Erichsen and V-bending test are performed in this study to measure the dimensional accuracy and formability, which are then compared with those of the conventional forming method. Furthermore, the strength and hardness of the products formed by HFQ are measured to confirm the degradation in mechanical properties compared with the conventional forming method, which shows the validity of the application of HFQ to aluminum sheet metal forming.
Cho, Young-Dae,Lee, In-Geun,Jung, Mi-Jin,Shin, Hyunsu,Jun, Dong-Hwan,Shin, Chan-Soo,Park, Kyung-Ho,Park, Won-Kyu,Kim, Dae-Hyun,Ko, Dae-Hong American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>We here report selective epitaxial growth of GaAs layers on Si (001) substrate with V-grooved trench using the aspect ratio trapping method. The V-grooved Si surface on the bottom of Si trenches was formed through a high temperature in situ baking process in H-2 atmosphere before growth of GaAs in a metal-organic chemical vapor deposition (MOCVD) chamber. The evolution of the V-grooved shape and the density of defects in selectively grown GaAs epitaxial layers are reported as a function of high temperature bake times before GaAs growth by using both high resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD).</P>
Moon, Geon Dae,Min, Yuho,Ko, Sungwook,Kim, Sun-Wook,Ko, Dae-Hong,Jeong, Unyong American Chemical Society 2010 ACS NANO Vol.4 No.12
<P>This study demonstrates solution-processed epitaxial growth of Te on Se<SUB><I>x</I></SUB>Te<SUB><I>y</I></SUB> nanorods and the generation of periodic defects in the core. We investigated Se<SUB><I>x</I></SUB>Te<SUB><I>y</I></SUB>@Te core−shell nanorods with a diameter of 40−50 nm and a length of 600−700 nm. In spite of a large lattice mismatch between the Se<SUB><I>x</I></SUB>Te<SUB><I>y</I></SUB> core and the Te shell, the soft character of the core and the shell at a high reaction temperature allowed epitaxial growth of Te on the Se<SUB><I>x</I></SUB>Te<SUB><I>y</I></SUB> nanorods. During the cooling process to room temperature (below the glass transition temperatures), the lattice mismatch between the core and the shell led to homogeneous stress along the epitaxial interface so that periodic defects were generated in the core.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-12/nn102196r/production/images/medium/nn-2010-02196r_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn102196r'>ACS Electronic Supporting Info</A></P>
Generation of red fluorescent protein transgenic dogs
Hong, So Gun,Kim, Min Kyu,Jang, Goo,Oh, Hyun Ju,Park, Jung Eun,Kang, Jung Taek,Koo, Ok Jae,Kim, Teoan,Kwon, Mo Sun,Koo, Bon Chul,Ra, Jeong Chan,Kim, Dae Yong,Ko, CheMyong,Lee, Byeong Chun Wiley Subscription Services, Inc., A Wiley Company 2009 Genesis Vol.47 No.5
<P>Dogs (Canis familiaris) share many common genetic diseases with humans and development of disease models using a transgenic approach has long been awaited. However, due to the technical difficulty in obtaining fertilizable eggs and the unavailability of embryonic stem cells, no transgenic dog has been generated. Canine fetal fibroblasts were stably transfected with a red fluorescent protein (RFP) gene-expressing construct using retrovirus gene delivery method. Somatic cell nuclear transfer was then employed to replace the nucleus of an oocyte with the nucleus of the RFP-fibroblasts. Using this approach, we produced the first generation of transgenic dogs with four female and two male expressing RFP. genesis 47:314–322, 2009. © 2009 Wiley-Liss, Inc.</P>
제주도 토양의 Fe산화물에 관한 Mossbauer 연구
홍성락,고정대,김두철,최원준,강동우 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.1
We did research for iron oxide of soil in 3 areas of Cheju island using Mossbauer spectroscopy. X-ray diffractometer and X-ray fluorescence spectrometer. We have not found any trace of iron oxide and soil mineral like goethite, hematite, ferrihydrite because of the limited detection on X-ray diffractometer. But we have confirmed the slight sign of geothite and hematite which belongs to iron of oxide. The result of analysis by X-ray fluorescence spectrometer shows that the rate of quantity of Fe₂O₃in 3 areas is Josuri with 7.69wt%. Odungdong with 10.03wt% and Toepyeoungdong with 11.98wt%. We have learned of the existence of iron oxide and the ratio of ??/?? by Mossbauer spectrum parameter but not by X-ray diffractometer or X-ray fluorescence spectrometer which are not able to detect them. We have confirmed that soil material of 3 areas in cheju island has goethite, hematite, ferrihydrite as well as original mineral at room temperature and at 18K.