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박종혁,석종식,목진호,박관,김영백,민병국,황성남,최덕영 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.6
In rare occasions in which aneurysmal neck clipping is nearly impossible, coating is employed. During the period from 1985 to 1992, 312 patients with aneurysm underwent surgery ; aneurysmal neck clipping were performed in 284 cases while coating only in 28. The reasons that coating was required were ; wide and broad neck in 13, perforators arising from the neck in 4, neck tearing during dissection in 3, very friable neck in 2, severe adhesion with surrounding structures in 3, and small aneurysm without enough room for clipping in 3. In twenty-three cases, cotton wisp and bioglue were used as coating materials. In another five cases, the aneurysmal wall was reinforced using Surgicel or Gelfoam. Patients were followed for 24 months on average of all the patients. Four had last contact Six died(4 due to rebleeding and 2 due to pneumonia). Fourteen were good and 4 were moderately disabled. There were no rebleeding incidences during first three months' follow-up after coating. We thus concluded that coating an aneurysm offers some protection from rebleeding, particularly when the rebleeding risk period is over.
탄탈륨 함유 9%Cr 페라이트/마르텐사이트 강의 미세조직 및 기계적 특성
백종혁 ( Jong Hyuk Baek ),한창희 ( Chang Hee Han ),김성호 ( Sung Ho Kim ),이찬복 ( Chan Bock Lee ),한도희 ( Do Hee Hahn ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.4
It was evaluated that the microstructural and mechanical properties of Ta-bearing 9Cr-0.5Mo-2W ferritic/martensitic experimental steels. All the experimental steels showed the tempered martensitic microstructures, and M23C6 carbides, whose sizes were ranged from 200 to 300 nm, were easily observed at both boundaries of the prior austenite grain and the martensite lath. In addition, a relatively large Nb-rich MX carbonitrides were intermittently detected at the prior austenite grain boundaries, whereas a lot of V-rich MX carbonitrides, whose mean diameter was less than 50 nm, were observed randomly at both boundaries. Ta was mainly incorporated into the V-rich MX carbonitrides rather than the Nb-rich ones and their content was spanned from 5 to 20 at.%. Ta contents within the MX precipitates also increased as the content of Ta increased. Because the Ta addition into the steels would be attributed to the precipitation strengthening, solid solution strengthening and lath width reduction, it was shown that the mechanical properties, including hardness, tensile strength and creep rate of the 9%Cr-0.5Mo-2W steels were improved by the increase of Ta content. Especially, 9Cr-0.5Mo-2W-0.3V-0.05Nb-0.14Ta steel was revealed to be relatively excellent in the application for the SFR fuel cladding.
고연소도 신형 Zr피복관의 미세조직과 기계적 특성에 미치는 열처리 및 중서자 조사의 영향
백종혁 ( Jong Hyuk Baek ),김현길 ( Hyun Gil Kim ),정용환 ( Yong Hwan Jeong ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.3
N/A The changes of microstructural and mechanical properties were evaluated for the high bum-up fuel claddings after the neutron irradiation of 1.8-3.1×10^(20)n/㎠ (E>1.O MEV) in HANARO research reactor. After the irradiation, the spot-type dislocations (a-type dislocations) were easily observed in most claddings, and the density of the dislocations was different depending on the grains and was higher at grain boundaries than within grains. As the final annealing temperature increased, the density of spot-type dislocations increased and the line-type dislocations (c-type dislocations) which was perpendicular to the <0002> direction, appeared sporadically in some claddings. However, the types of precipitates in the fuel claddings after the irradiation were not changed from that in unirradiated claddings. The mechanical properties including the hardness, strength and elongation after the irradiation were changed due to the formation of spot-type dislocations. That is, the increase in hardness and strength as well as the decrease in elongation after the irradiation was occurred simultaneously with increasing the final annealing temperature. Owing to the Nb contribution to the formation of spot-type dislocation during the irradiation, the increase in hardness and strength in higher Nb-contained Zr alloys after the irradiation was higher than that in lower Nb-contained Zr alloys.
인터넷 생존성 및 안정성 강화를 위한 대책 및 복구 방안
백종혁(Baek Jong Hyuk),최영준(Choi Young Jun),정선화(Jung Sun Hwa),박석천(Seok Cheon Park) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.2
인터넷이 국내에 첫 선을 보인 이후 국내 인터넷 망 시장은 급속히 성장해 2005년 기준으로 인터넷 이용자가 3,200만 명을 넘어서고 있으며 인터넷 이용자 1인당 평균 2개 이상의 이메일을 보유하게 되었다. 인터넷 서비스사업자(ISP Internet Service Provider) 또한 지속적인 증가로 1999년 초 26개였던 ISP가 1999년 말에는 2배에 달하는 54개로 증가했으며 2005년 말에는 80여 개 이상으로 증가하고 있다. 이와 같은 인터넷 이용자의 급격한 증가와 다수의 인터넷 서비스 사업자의 등장으로 인터넷 트래픽이 급격하게 증기하고 있으나 태풍, 지진 등의 재난재해로 인한 통신대란 또는 『1.25 인터넷 대란』 과 같은 국가적 통신 재난 발생시 효율적인 대책 및 복구방 안은 미비한 상태이다. 따라서 본 논문에서는 인터넷의 생존성, 안정성 강화를 위하여 기존 인터넷 망간 장애 상황을 조사하고 망간 연동 장애 발생 시 사회적 경제적인 문제점을 분석한 후 비 상시 중단 없는 서비스를 위하여 인터넷 생존성 및 안정성을 위한 방안을 제안하였다.
Jong Hyuk Yun,Hae Il Jung,Hyoung Uk Lee,Moo-Jun Baek,Sang Ho Bae 대한외과학회 2017 Annals of Surgical Treatment and Research(ASRT) Vol.92 No.3
Purpose: Laparoscopic cholecystectomy (LC) is one of the most commonly performed surgeries in the world today. However, there is no consensus regarding whether LC can be performed in patients with acute cholecystitis while on antithrombotic therapy. The objective of our study was to describe postoperative outcomes of patients who underwent emergent LC without interruption to antithrombotic therapy. Methods: We performed a retrospective review of patients who underwent LC for acute cholecystitis while on antithrombotic therapy from 2010 to 2015 at Soonchunhyang Universtiy Cheonan Hospital. Patients were divided into 2 groups as underwent emergent LC and elective LC. Results: A total of 67 patients (emergent group, 22; elective group, 45) were included in the analysis. Elective group had significantly longer duration between the admission and operation (8 [7–10] days vs. 2 [1–3] days, P < 0.001) and longer duration of antithrombotic drugs discontinuation (7 days vs. 1 [0–3] days, P < 0.001). Emergent group had significantly more postoperative anemia (6 patients vs. 0 patient, P = 0.001) and 3 of 6 patients received packed RBC transfusion in postoperative period. However, there was no significant difference in length of postoperative stays, length of intensive care unit stays and mortality rates. Conclusion: Emergent LC without interruption to antithrombotic therapy was relatively safe and useful. A well-designed multicenter study is needed to confirm the safety and efficacy of LC without suspension of antithrombotic therapy and to provide a simple guideline.
Baek, Ae Rin,Lee, Ji Min,Seo, Hyun Jung,Park, Jong Sook,Lee, June Hyuk,Park, Sung Woo,Jang, An Soo,Kim, Do Jin,Koh, Eun Suk,Uh, Soo Taek,Kim, Yong Hoon,Park, Choon Sik The Korean Academy of Tuberculosis and Respiratory 2016 Tuberculosis and Respiratory Diseases Vol.79 No.3
Background: Idiopathic pulmonary fibrosis (IPF) is a progressive and lethal lung disease characterized by the accumulation of excessive fibroblasts and myofibroblasts in the extracellular matrix. The transforming growth factor ${\beta}1$ (TGF-${\beta}1$)-induced epithelial-to-mesenchymal transition (EMT) is thought to be a possible source of fibroblasts/myofibroblasts in IPF lungs. We have previously reported that apolipoprotein A1 (ApoA1) has anti-fibrotic activity in experimental lung fibrosis. In this study, we determine whether ApoA1 modulates TGF-${\beta}1$-induced EMT in experimental lung fibrosis and clarify its mechanism of action. Methods: The A549 alveolar epithelial cell line was treated with TGF-${\beta}1$ with or without ApoA1. Morphological changes and expression of EMT-related markers, including E-cadherin, N-cadherin, and ${\alpha}$-smooth muscle actin were evaluated. Expressions of Smad and non-Smad mediators and TGF-${\beta}1$ receptor type 1 ($T{\beta}RI$) and type 2 ($T{\beta}RII$) were measured. The silica-induced lung fibrosis model was established using ApoA1 overexpressing transgenic mice. Results: TGF-${\beta}1$-treated A549 cells were changed to the mesenchymal morphology with less E-cadherin and more N-cadherin expression. The addition of ApoA1 inhibited the TGF-${\beta}1$-induced change of the EMT phenotype. ApoA1 inhibited the TGF-${\beta}1$-induced increase in the phosphorylation of Smad2 and 3 as well as that of ERK and p38 mitogen-activated protein kinase mediators. In addition, ApoA1 reduced the TGF-${\beta}1$-induced increase in $T{\beta}RI$ and $T{\beta}RII$ expression. In a mouse model of silica-induced lung fibrosis, ApoA1 overexpression reduced the silica-mediated effects, which were increased N-cadherin and decreased E-cadherin expression in the alveolar epithelium. Conclusion: Our data demonstrate that ApoA1 inhibits TGF-${\beta}1$-induced EMT in experimental lung fibrosis.
Thermal Behavior of Hot Strip in Finishing Mill of Hot Rolling Process
Jong-Hyeon Lee,Jeong-Seok Kang,Jin-Taek Kim,Byung-Joon Baek,Sung-Hyuk Lim,Jun-Seok Lim,Hyeong-Jin Kim 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.10
To apply efficient rolling conditions in the finishing rolling process, a correct prediction of the behavior of the strip temperature is required. This study is focused on the temperature distribution of the strip temperature from FET to FDT of the actual finishing rolling process. The heat transfer phenomena generated during the finishing rolling process, such as heat generation, cooling and conducting, were modeled in this study using the finite difference method. Using various heat transfer phenomena generated in the finishing rolling process and the correlation formula of spray cooling coefficient, the calculation accuracy was improved and a simulator to predict the temperature distribution of strip was prepared. The calculated result is compared to the online model used in the actual industry.