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최과 교정용 스테인리스 강 선재의 신선 가공법이 내식성에 미치는 영향
고영무,모웅남,최한철 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.1
The dental orthodontic wire requires good mechanical properties, such as elastic strength, combined with a high resistance to corrosion. For increasing elastic strength and delaying onset of stress corrosion cracking, drawing methods(one-step and two-step drawing) have been used in this study to extend service life of metal components, However, there is no information on the electrochemical corrosion behavior of drawn wires for orthodontics. To increase elastic strength, good corrosion resistance, and biocompatibility, the electrochemical characteristics of drawn wire have been researched by field emission scanning microscope and potentiodynamic method in 0.9% NaCl solution. The one-step drawn wire showed the formation of rough surface. The hardness and tensile strength of two-step drawn wire increased. Electrochemical measurements showed that, in the case of two-step drawn wire, the corrosion resistance and pitting potential increased compared with two-step drawn wire due to the drawing induced small surface roughness, such as scratch, whereas passivation and active current density decreased as the reduction in area for drawing increased.
최한철,고영무,모웅남 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3
The first factor to decide the success of dental implantation is sufficient, osseointegration between implant fixture and its surrounding bone tissue. Thus many studies about this have been under actively. In recent, one of them is to increase the roughness of the surface of an implant fixture by treating the surface of an implant fixture in various ways, increase the contact area between an implant fixture and its surrounding bone tissue and so induce a sufficient osseointegration between them. The roughness of the surface on an implant fixture can be increased by coating the smooth surface of an implant fixture with hydroxyapatite or titanium particles or by treating the surface with acid. But these ways can cause the failure of implantation in the long run due to the separatation of coated particles from an implant fixture and sometime; can't attain the sufficient osseointegration because of emitting ion into the surrounding bone tissue. To develop dental implant materials, fabrication and physical properties of sintered stainless steel have studied using hardness tester, tensile tester, SEM, TEM, EPMA, EDX. Stainless steel compacts containing Cu (2-10 wt%) were prepared either by electroless Cu-plating method which result in the increased homogenization in alloying powder or by Cu-elemental powder addition method on the stainless steel powder Experimental investigation foucusing on mechanical property was performed for Cu-added samples to study the effects of Cu content, electroless Cu-plating method, and Cu-elemental powder addition method on the surface characteristics of sintered stainless steel in Mo and Cu in sintered stainless steel on the mechanical behaviors. Microstructural characterization revealed that Cu-addition by electroless Cu-plating method resulted in less porous material compared that prepared by Cu-elemental powder addition method. Since Cu is blown to be effective in reducing the precipitation of chromium carbide at sensitization temperature, Cr concentration in electroless Cu-plating method was uniformly distributed in the grain boundary and in the matrix. The sintered density in electroless Cu-plating method increased with reducing porosity as a result of the Cu-uniform distribution due to electroless Cu plating during the sintering process. The amount of Cu added in the sintered stainless steel affected significantly tensile strength which increased with 4 wt% Cu and decreased with more than 7 wt% Cu.
조형등대와 건축적 표상에 관한 연구 : 통영 문학기념 조형등대의 디자인 기술을 중심으로
안웅희(Ahn Woong-Hee),송민성(Song Min-Sung),고신채(Ko Sin-Chai),한창수(Han Chang-Soo) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.1 No.춘계
등대는 전통적인 기능과 역할에 충실한 항로표지일 뿐만 아니라 사람들의 향수와 해양문화의 기억들이 묻어있는 공간이다. 최근에는 적절한 해양문화공간으로 개발함으로써 해양문화에 대한 인식을 높이고, 지역관광에 공헌을 하고 있는 추세이다. 특히, 해양수산부는 2006년 "희망의 빛 조형등대 설치계획"을 통하여 마산지방해양수산청 소속의 통영시 도남항 동방파제 등대를 건설하였다. 지역과 문화적 특색을 살릴 수 있는 기념등대로 개발하고자 하였으며, 이에 따라 통영의 훌륭한 문화적 성과를 기념대상으로 지정하였다. 이에 현상공모를 통해 한국해양대학교의 안웅희 교수의 작품이 당선되었다. 본 연구는 기존의 등대의 형태에서 벗어난 추상적이면서 기하학적인 형상을 통해 통영 일대의 문화적, 관광적 요소에 미치는 영향을 살펴봄으로써, 향후 등대건축의 방향성을 제시하고, 다양하게 검토되어야 할 논제들을 밝히는 것에 그 목적이 있다. The Lighthouse is not only functioning as a traditional aids to navigate for the vessel, but also space that has memory about marine culture and man's nostalgia. Recently, it contributes to regional tourism and makes a new meaning about marine culture through the development of lighthouse to a proper space of ocean culture. Especially, MOMAF has constructed the sculpture lighthouse in Tongyeong as "the light of hope-sculptural lighthouse project". They hoped to develop the memorial lighthouse that represents characteristic of the region and culture and it became a symbol of the great culture in Tongyeong. Through the competition, prof. Ahn Woong-Hee's design won the project, and constructed. For this situation, we intended to reveal in this study that all the issues which relate to the design for lighthouse in the future through the abstract, geometrical form of lighthouse that deviated the traditional design.
Han, Mi Seon,Ko, Jung Min,Cho, Tae-Joon,Park, Woong-Yang,Cheong, Hae Il Institute for Clinical Science] 2015 Annals of clinical and laboratory science Vol.45 No.1
<P>Hajdu-Cheney syndrome (HCS) and serpentine fibula-polycystic kidney syndrome (SFPKS) share many similarities, including craniofacial abnormalities, bony deformities, and renal involvement. Because mutations in exon 34 of NOTCH2 have been identified recently in both HCS and SFPKS patients, it has been suggested that these two syndromes be classed as the same disorder. A 3-year-old boy presented with polycystic kidneys and club feet detected during the fetal period; however, acroosteolysis and curved fibulae were not observed. His mother showed osteoporosis and had a history of compression fractures in the spine without renal anomalies. Although the same novel mutation in NOTCH2 was found in both the mother and her son, these patients displayed different clinical manifestations. In this report, we present a familial case of HCS in a boy and his mother that was suspected on physical examination and radiological findings. We speculate that HCS and SFPKS are a single disease entity with a wide spectrum of clinical manifestations associated with truncating mutations in exon 34 of NOTCH2.</P>
Han, Hyungkyu,Park, Hyunjung,Kil, Ki Chun,Jeon, Yeryung,Ko, Youngsan,Lee, Changju,Kim, Minjae,Cho, Chae-Woong,Kim, Kijun,Paik, Ungyu,Song, Taeseup Elsevier 2015 ELECTROCHIMICA ACTA Vol.166 No.-
<P><B>Abstract</B></P> <P>As the density of graphite anode is increasing, the pore size and volume in the graphite anode is reduced, which results in a decrease in the electrolyte permeability of electrode. The electrochemical degradation of high density graphite anode due to the low permeability is a major obstacle to its use as anode for lithium ion batteries. In this study, we report on high density graphite anode with the carbon additive added that provides micron size pore structure of the high density graphite anode, which results in an increase in the rate capability. The high density graphite anode with carbon additive exhibited 32.4% higher rate capability at 1C compared to the high density graphite anode without carbon additive. This improvement is mainly attributed to the increased micron-size pores, which enhances the kinetic associated with lithium by improved electrolyte permeation and increased interface between the electrolyte and active material.</P>
Ko, Eun-Sang,Kim, Sun Kwang,Kim, Jung-Taek,Lee, Giseog,Han, Jae-Bok,Rho, Sam-Woong,Hong, Moo-Chang,Bae, Hyunsu,Min, Byung-Il 경희대학교 동서의학연구소 2006 東西醫學硏究所 論文集 Vol.2006 No.-
The present study was performed to determine whether the expression levels of the hypothalamic cholecystokinin (CCK) and its receptors are associated with the responsiveness to high frequency electroacupuncture (EA) analgesia in rats. EA stimulation (100 Hz, 0.5 mspulse width, 0.2-0.3 mA) was delivered to the Zusanli (ST36) acupoint of male Sprague-Dawley rats for 20 min without anesthetics or holder restraint. The analgesic effect of EA was quantified using a tail flick latency test, and subsequently animals were allocated to responder or non-responder groups. The hypothalamus of rats in each group was dissected and RNA was purified. The mRNA expressions of CCK, and CCK-A and -B receptor were determined by real-time RT-PCR. CCK mRNA levels were not significantly different in the two groups, whereas both CCK-A and -B receptors were significantly more expressed in non-responders. These results suggest that the level of CCK receptor mRNA expression in the hypothalamus, rather than CCK mRNA, has an important relationship with the individual variations to high frequency EA analgesia in rats.
Ko, Aram,Han, Su Yeon,Choi, Chel Hun,Cho, Hanbyoul,Lee, Min-Sik,Kim, Soo-Youl,Song, Joon Seon,Hong, Kyeong-Man,Lee, Han-Woong,Hewitt, Stephen M.,Chung, Joon-Yong,Song, Jaewhan Nature Publishing Group UK 2018 Cell death and differentiation Vol.25 No.6
<P>Oncogene-induced senescence (OIS) is a critical tumor-suppressor mechanism, which prevents hyper-proliferation and transformation of cells. c-Myc promotes OIS through the transcriptional activation of p14ARF followed by p53 activation. Although the oncogene-mediated transcriptional regulation of p14ARF has been well addressed, the post-translational modification of p14ARF regulated by oncogenic stress has yet to be investigated. Here, we found that c-Myc increased p14ARF protein stability by inducing the transcription of ubiquitin-specific protease 10 (USP10). USP10, in turn, mediated the deubiquitination of p14ARF, preventing its proteasome-dependent degradation. USP10-null mouse embryonic fibroblasts and human primary cells depleted of USP10 bypassed c-Myc-induced senescence via the destabilization of p14ARF, and these cells displayed accelerated hyper-proliferation and transformation. Clinically the c-Myc-USP10-p14ARF axis was disrupted in non-small cell lung cancer patients, resulting in significantly worse overall survival. Our studies indicate that USP10 induced by c-Myc has a crucial role in OIS by maintaining the stability of key tumor suppressor p14ARF.</P>
Ko, Sunggeon,Jun, Sung-Hoon,Bae, Hansol,Byun, Jung-Sue,Han, Woong,Park, Heeyoung,Yang, Seong Wook,Park, Sam-Yong,Jeon, Young Ho,Cheong, Chaejoon,Kim, Woo Taek,Lee, Weontae,Cho, Hyun-Soo Oxford University Press 2008 Nucleic acids research Vol.36 No.8
<P>Telomeres are protein–DNA elements that are located at the ends of linear eukaryotic chromosomes. In concert with various telomere-binding proteins, they play an essential role in genome stability. We determined the structure of the DNA-binding domain of NgTRF1, a double-stranded telomere-binding protein of tobacco, using multidimensional NMR spectroscopy and X-ray crystallography. The DNA-binding domain of NgTRF1 contained the Myb-like domain and C-terminal Myb-extension that is characteristic of plant double-stranded telomere-binding proteins. It encompassed amino acids 561–681 (NgTRF1<SUP>561–681</SUP>), and was composed of 4 α-helices. We also determined the structure of NgTRF1<SUP>561–681</SUP> bound to plant telomeric DNA. We identified several amino acid residues that interacted directly with DNA, and confirmed their role in the binding of NgTRF1 to telomere using site-directed mutagenesis. Based on a structural comparison of the DNA-binding domains of NgTRF1 and human TRF1 (hTRF1), NgTRF1 has both common and unique DNA-binding properties. Interaction of Myb-like domain with telomeric sequences is almost identical in NgTRF1<SUP>561–681</SUP> with the DNA-binding domain of hTRF1. The interaction of Arg-638 with the telomeric DNA, which is unique in NgTRF1<SUP>561–681</SUP>, may provide the structural explanation for the specificity of NgTRF1 to the plant telomere sequences, (TTTAGGG)<SUB>n</SUB>.</P>