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쇄석 골재의 광물학적 및 화학적 특성과 알칼리-실리카 반응성
전쌍순,박현재,이효민,진치섭 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-
본 연구에서는 쇄석 골재의 광물학적 및 화학적 특징과 알칼리-실리카 반응에 대한 골재의 유해 가능성을 연구하였다. 이를 위하여 알칼리-실리카 반응을 유발하는 광물들의 포함여부 및 이에 따라 잠재적으로 조기 열화현상을 유발할 수 있는 암석을 유형별(화성암, 변성암, 퇴적암 및 탄산염암)로 골재를 수집하였다. 암종 별로 선별하여 수집한 골재 내의 알칼리 반응성 유해 물질 존재 여부 확인 X선 회절분석(XRD)과 편광현미경에 의한 광물학적 방법을 사용하였다. 알칼리-실리카 반응성 유무해 판단을 ASTM C 227의 Mortar-Bar 시험방법에 의해 평가 분석하였고, 주 화학성분은 X선 형광분석기(XRF)로 실시하였다. In Korea, due to the shortcomings of natural aggregates and increasing needs of crushed stones, it is necessary to examine the alkali-silica reaction of the crushed stones. The purpose of this study is to analyze petrographic, chemical properties and alkali-silica reaction of crushed stones. This study was performed to investigate the alkali-silica reaction of crushed stones using chemical analysis, physical properties, XRD, XRF and mortar-bar method. As a result, most of test aggregates didn't show any reaction, but many test aggregates have common deleterious mineral. Therefore, there exists the possibility of chemical reaction in petrographic point of view.
김현준,류정섭,권효석,조형래 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-
This paper introduces trust measurement that is composed of trust variables and fuzzy cognitive map. The improved trust measuring method using a stratified FCM can be used to measure the level of risk involved in a specific auction transaction concerned. To reduce the auction transaction cost and time, the proposed system recommends a differentiated transaction protocol according to the risk based on trust measurement. In this system, trust measurement can also be applied for differentiated and varied auction services.
[논문]반응성 골재의 입자 크기와 입도가 모르타르의 알칼리-실리카 반응 팽창에 미치는 영향
전쌍순,이효민,진치섭 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-
골재의 알칼리-실리카 반응성을 판정하는 방법으로 모르타르 바 법 (Mortar-Bar method) 이 일반적으로 사용되고 있다. 본 연구에서는 알칼리 골재 반응성을 판정하는 모르타르 바 법 중에서 촉진시험법인 ASTM C 1260 시험방법을 이용하여 반응성 골재를 판별하고l 판별된 반응성 골재의 입자 크기와 입도가 모르타르의 알칼리-실리카 반응 팽창에 미치는 영향에 관하여 검토하였다. 그 결과I 반응성 골재의 입자 크기 및 입도에 상관없이 반응성 골재의 총표면적이 커질수록 팽창률도 증대하여,알칼리-실리카 반웅에 의한 팽창과 반웅성 골재의 총표면적과의 사이에는 상관관계가 있는 것을 확인할 수 있었다.
[논문]재생골재의 광물학적 및 화학적 특성과 동결융해 저항성
전쌍순,이효민,진치섭 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-
급속한 산업화와 인구증가 및 대량소비에 따른 페기물에 의하여 초래되는 지구 환경오염을 위한 사회시스템의 구축이 필요함을 암시한다고 볼 수 있다. 본 연구에서는 지금까지 주로 저급재료로 사용되던 재생골재의 구성광물,화학조성 및 물리화학적 특성과 알칼리-골재 반응성 여부를 조사하고, 재생굵은골재의 대체율에 따른 콘크리트 강도와 동결융해 저항성을 검토하여 재생골재의 재활용을 위한 기초자료를 제시하고자 한다. 본 연구에 사용된 재생골재는 천연골재에 비교하여 공학적 기초 물성치에서 현저히 큰 차이는 나타내지 않았으며, 이를 사용한 재생콘크리트의 공학적 특성도 보통 콘크리트의 기준에 근접하는 것으로 나타났다.
W<sub>35</sub>Fe<sub>43</sub>C<sub>22</sub>비정질 합금분말의 결정화 거동
권영준 ( Young Jun Kwon ),유정선 ( Jung Sun Yoo ),박수근 ( Soo Keun Park ),이근효 ( Keun Hyo Lee ),조기섭 ( Ki Sub Cho ) 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.4
W, Fe, and carbon powders were mechanical alloyed to produce W<sub>35</sub>Fe<sub>43</sub>C<sub>22</sub> ternary alloy powders containing nanocrystal W embedded within amorphous matrix. When the powder samples were heated to the primary crystallization temperature of 735℃, most parts of their amorphous region were fully crystallized to [W,Fe]- rich M<sub>6</sub>C carbides. Interestingly, a little portion of the carbides changes to stoichiometric line compounds (M<sub>12</sub>C and W<sub>6</sub>Fe<sub>7</sub>) and a solution phase (Fe-rich bcc), and remaining parts of the crystallites were amorphized again. The resulting microstructure was retained even by cyclic heating between room temperature of 1,200oC, and thus we found that the amorphous structure can be irreversibly formed at above glass transition temperature. (Received June 11, 2018; Revised June 25, 2018; Accepted July 3, 2018)
Hyo Sub Jun,Kuhyun Yang,Jongyeon Kim,Jin Pyeong Jeon,Jun Hyong Ahn,Seung Jin Lee,Hyuk Jai Choi,Jongwook Choi,Sung Min Cho,Jong Kook Rhim 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.5
We aimed to develop a cloud-based telemedicine platform for patients with intracerebral hemorrhage (ICH) at local hospitals in rural and underserved areas in Gangwon-do using artificial intelligence and non-face-to-face collaboration treatment technology. This is a prospective and multi-center development project in which neurosurgeons from four university hospitals in Gangwondo will participate. Information technology experts will verify and improve the performance of the cloud-based telemedicine collaboration platform while treating ICH patients in the actual medical field. Problems identified will be resolved, and the function, performance, security, and safety of the telemedicine platform will be checked through an accredited certification authority. The project will be carried out over 4 years and consists of two phases. The first phase will be from April 2022 to December 2023, and the second phase will be from April 2024 to December 2025. The platform will be developed by dividing the work of the neurosurgeons and information technology experts by setting the order of items through mutual feedback. This article provides information on a project to develop a cloud-based telemedicine platform for acute ICH patients in Gangwon-do.
Hyo Sub Jun,In Bok Chang,JunHyong Ahn,Joon Ho Song 대한뇌혈관외과학회 2016 Journal of Cerebrovascular and Endovascular Neuros Vol.18 No.4
Cases of spontaneous regression of cerebral aneurysm remnant after incomplete surgical clipping have been rarely reported. This paper reports the regression of an aneurysm remnant after incomplete surgical clipping during postsurgical follow-up. A 50-year-old male presented with subarachnoid hemorrhage because of rupture of an anterior communicating artery aneurysm. An emergency clipping of the aneurysm was performed. A cerebral angiography, which was performed two weeks postoperatively, revealed an aneurysm remnant. The patient refused additional treatment and was discharged without apparent neurological deficit. One-year follow up cerebral angiography demonstrated a partially regressed aneurysm remnant.
Hyo Sub Jun,Kuhyun Yang,Jongyeon Kim,Jin Pyeong Jeon,Sun Jeong Kim,Jun Hyong Ahn,Seung Jin Lee,Hyuk Jai Choi,In Bok Chang,Jeong Jin Park,Jong-Kook Rhim,Sung-Chul Jin,Sung Min Cho,Sung-Pil Joo,Seung Hu The Korean Neurosurgical Society 2024 Journal of Korean neurosurgical society Vol.67 No.4
Previously, we reported the concept of a cloud-based telemedicine platform for patients with intracerebral hemorrhage (ICH) at local emergency rooms in rural and medically underserved areas in Gangwon state by combining artificial intelligence and remote consultation with a neurosurgeon. Developing a telemedicine ICH treatment protocol exclusively for doctors with less ICH expertise working in emergency rooms should be part of establishing this system. Difficulties arise in providing appropriate early treatment for ICH in rural and underserved areas before the patient is transferred to a nearby hub hospital with stroke specialists. This has been an unmet medical need for decades. The available reporting ICH guidelines are realistically applicable in university hospitals with a well-equipped infrastructure. However, it is very difficult for doctors inexperienced with ICH treatment to appropriately select and deliver ICH treatment based on the guidelines. To address these issues, we developed an ICH telemedicine protocol. Neurosurgeons from four university hospitals in Gangwon state first wrote the guidelines, and professors with extensive ICH expertise across the country revised them. Guidelines and recommendations for ICH management were described as simply as possible to allow more doctors to use them easily. We hope that our effort in developing the telemedicine protocols will ultimately improve the quality of ICH treatment in local emergency rooms in rural and underserved areas in Gangwon state.
Hyo Jun Kim,Eun-Ah Jo,Hyung Sub Park,Taeseung Lee,Sukgu Han 대한외과학회 2024 Annals of Surgical Treatment and Research(ASRT) Vol.106 No.2
Purpose: Physician-modified endovascular stent grafts (PMEG) are a good treatment option for complex abdominal aortic aneurysms (AAAs), especially in high-risk patients not amenable to open repair, and when commercial fenestrated devices are not available. We report our single-center experience with PMEG for the treatment of complex AAAs. Methods: We retrospectively reviewed patients who underwent PMEG repair for AAA from November 2016 to September 2020 at our institution. Demographic data, anatomic characteristics, perioperative and postoperative outcomes, major adverse events, and 30-day mortality were analyzed. Results: We identified 12 patients who underwent PMEG for complex AAA. The mean age was 74 years and the mean maximal AAA diameter was 58.1 mm. Indications for treatment included 4 impending or contained ruptures, 2 mycotic aneurysms, and 6 symptomatic cases. The technical success rate was 91.7%. Aneurysm sac regression was observed in 7 patients (58.3%), including 2 cases of complete regression. There was 1 aneurysm-related mortality at 3 months due to mycotic aneurysm. Also, there was 1 postoperative complication case of transient renal failure requiring temporary dialysis. At 1 year, there was 1 branch occlusion from the initial failed cannulation case and 2 type 1A endoleaks, and there was 1 case of open explantation. Conclusion: PMEG showed a low technical failure rate and acceptable midterm stent durability and sac stability, comparable to conventional endovascular aneurysm repair. Despite the small number of cases, there was a tendency for a high sac regression rate, although longer follow-up is needed.
Comparison of Three Primary Models for Fitting Staphylococcus aureus Growth Curves on Cabbage
Jun Wang,Myoung-Su Park,S.M.E. Rahman,Tian Ding,Joong-Hyun Park,Fereidoun Forghani,Na-Jung Choi,Ha-Na Kim,Gwang-Hee Kim,Hyo-Jung Choi,Sang-Do Ha,Myung-Sub Chung,Deog-Hwan Oh 한국식품영양과학회 2011 한국식품영양과학회 학술대회발표집 Vol.2011 No.10