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임선빈,최병기,기준호,장만 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
본 논문은 서로 다른 재료를 표면활성화법을 이용하여 저온에서 접합할 목적으로 이들 재료의 접합 가능성을 검토하고 이들 접합계면에서의 접합 메카니즘을 검토할 목적으로 연구하였으며 연구 결과는 다음과 같다. 1) 10-7 Torr대의 진공도에서도 알루미늄은 알루미나, 질화 알루미늄, 질화규소, 지르코늄 등의 세라믹스와 양호한 접합이 가능하였다. 2) 알루미늄, 동, 은은 같은 금속끼리의 접합이 가능하였고, 또 알루미늄과 동의 이종재료의 접합도 가능하였다. 3) 실리콘은 알루미늄, 동, 은, 금 등과의 접합 실험결과 모든 금속과 접합이 가능하였다. In this paper considered it possible to bond different materials in low temperature using surface activated method. To do so, it was examined the possibility of bonding different materials and applied the bonding mechanism on the bonding surface. The followings are the result. 1) It was possible that aluminum could be bonded well with ceramics such as alumina, nitrification aluminum, nitrification silicon, and zirconium at the vaccum level of 10-7 Torr. 2) It was possible that aluminum, copper, and copper could be bonded with each other and aluminum and copper could be bonded with other metals. 3) Silicon was bonded with aluminum, copper, silver, and gold which were tested before.
殘留應力을 考慮한 鎔接材의 疲勞龜裂 進展擧動에 關한 硏究
최병기,이을호,국중민,기준호,임선빈,정장만 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
The effect of welding residual stress on the initiation and propagation of fatigue crack is investigated so as to study the fatigue behavior in welding residual stress field. Especially, the relation between welding residual stress and fatigue crack opening behavior is investigated and the redistribution of residual stress as a fatigue crack propagates is examined. Following results are obtained. 1) In case of the load range is constant, as the stress ratio is changing to 0.1, 0.33, 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life increase. 2) The fatigue crack propagations rate da/dN appears to accelerate when the stress intensity factor range ΔK is less than 15MPa-m^1/2. 3) The residual stress that is appeared by welding decreases after cutting. 4) Fatigue crack propagation ratio is affected by tensional and compressible residual stress at the initial time, but it's similar to the original in the more than 20mm of crack length.
[PE-0061] Advancement potato breeding for French fries from 2019 to 2021
Jang Gyu Choi(Jang Gyu Choi),Yong Ik Jin(Yong Ik Jin),Gyu Bin Lee(Gyu Bin Lee),Jung Gun Ho(Jung Gun Ho),Do Hee Kwon(Do Hee Kwon),Kwang Ryong Cho(Kwang Ryong Cho),Chung Ki Choen(Chung Ki Choen),Yeong E 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Dong-Ho Shin,Hyun-Jae Kang,Jae-Sik Jang,Keon-Woong Moon,Young Bin Song,Duk-Woo Park,Jang-Whan Bae,Juhan Kim,Seung-Ho Hur,Byung Ok Kim,Dong Woon Jeon,Donghoon Choi,Kyoo-Rok Han 대한심장학회 2019 Korean Circulation Journal Vol.49 No.12
Background and objectives: In this second report from Korean percutaneous coronary intervention (K-PCI) registry, we sought to describe the updated information of PCI practices and Korean practice pattern of PCI (KP3). Methods: In addition to K-PCI registry of 2014, new cohort of 2016 from 92 participating centers was appended. Demographic and procedural information, as well as in-hospital outcomes, of PCI was collected using a web-based reporting system. KP3 class C was defined as any strategy with less evidence from randomized trials and more aggressive for PCI than medical therapy or bypass-surgery. Results: In 2016, total 48,823 PCI procedures were performed at 92 participating centers. Mean age of the patients was 65.7±11.6 years, and 71.7% were males. Overall patient characteristics and PCI practices in 2016 were similar to those in 2014. The biggest change was the decrease in the in-hospital occurrence of myocardial infarction (MI;1.6%→0.7%, p<0.001). Many associations between PCI volumes and demographic/procedural characteristics observed in 2014 have disappeared. The median of door-to-balloon time was 62 minutes, and 83.3% of ST-elevation MI patients received primary PCI within 90 minutes, while the median of total ischemic time was 168 minutes and patients who had total ischemic time within 120 and 180 minutes were 29.1% and 54.1%, respectively. The proportion of KP3 class C cases in non-acute coronary syndrome patients decreased from 13.5% in 2014 to 12.1% in 2016 (p<0.001). Conclusions: In this second report from K-PCI registry, we described the current practices of PCI and changes from 2014 to 2016 in Korea.
FIDO, NFC, 블록체인을 활용한 오프라인 본인확인 서비스 제안
장호빈(Jang Ho Bin),이창모(Lee Chang Mo),조소연(Cho So Yeon) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
오프라인에서 본인확인을 진행하는 경우, 대부분 주민등록증, 운전면허증 등 신분증의 사진과 실제 얼굴을 비교하는 방식으로 이루어진다. 이로 인해 대리 시험, 대리 진료, 위조 신분증 등 많은 사회 문제가 발생하며, 신분증을 분실할 경우, 개인 정보 노출의 위험이 존재한다. 이를 방지하기 위하여 FIDO와 블록체인을 활용한 본인확인 서비스 구조를 제안하며, NFC를 활용하여 빠른 인증이 가능할 것으로 기대한다.
Yeo-bin Park,Chang Beohm Ahn,Yun-Leong Park,Ji-Won Baek,Won-Ho Kong,Bo-Sung Kim,Bong-ho Lee,Sun-hee Jang,Choon-ho Song,Hyun-min Yoon,Cheol-hong Kim 대한침구의학회 2021 대한침구의학회지 Vol.38 No.1
The aim of this case report was to observe the effects of intra-articular hominis placenta pharmacopuncture (HPP). Based on the medical records patients who received intra-articular treatment or received acupoint pharmacopuncture treatment, a comparison was made. There were 35 patients who were hospitalized for degenerative osteoarthritis of the knee joint from the 1 st October 2019 to 26 th September 2020. There were 14 patients who were treated with HPP in the intra-articular joint space (Group A), and 14 patients who were treated with HPP at specific acupoints (Group B). The outcome effects were measured using the Korean Western Ontario and Mc (KWOMAC) the visual analog scale (VAS) before the first treatment, and after the fifth treatment. The KWOMAC (p < 0.001) and the VAS scores (p < 0.001) in Groups A and B significantly improved after treatment compared with before treatment. When comparing Group A improvement with Group B improvement using the KWOMAC there was no statistically significant difference however, when using the VAS scores, Group A treatment was statistically more effective compared with Group B (p = 0.002). This study indicated that HPP may be an effective treatment for knee osteoarthritis. Moreover, intra-articular HPP may be more effective than acupoint HPP for knee osteoarthritis.
장호빈(Jang Ho Bin),신은규(Shin Eun Kyu),이승아(Lee Seung A),유재겸(Yoo Jae Kyeom) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
현재 대다수 블록체인 네트워크의 서명 과정에 사용 중인 ECDSA는 양자 컴퓨팅 환경에서 더 이상 안전하지 않음이 Shor’s algorithm에 의해 밝혀졌다. 이로 인해 양자 컴퓨팅 환경에서도 안전한 양자 내성 블록체인의 필요성이 대두되고 있다. 하지만 ECDSA를 대체하기 위한 양자 내성 서명 알고리즘은 ECDSA에 비해 방대한 크기의 키와 서명을 가진다. 이에 따라, 기존 블록체인 시스템에 양자 내성 서명 알고리즘을 적용하면 디스크 용량에 대한 과부하가 발생할 수 있다. 또한, 블록, 트랜잭션 데이터의 방대한 크기에 의해 네트워크 패킷 전달 과정에서 과부하가 발생할 수 있다. 이를 방지하기 위해 ‘양자 내성 블록체인을 위한 경량화 구조’를 제안한다.
장호열 ( Ho-yeol Jang ),이수련 ( Su-ryeon Lee ),이윤지 ( Yun-ji Lee ),이수빈 ( Soo-bin Lee ),이하늘 ( Ha-neul Lee ),이혜빈 ( Hye-bin Lee ),황수정 ( Soo-jeong Hwang ) 한국치위생과학회 2016 치위생과학회지 Vol.16 No.6
본 연구는 구강보건교육에 대한 경험, 계속구강건강관리프로그램 필요성과 참여 의향을 알아보기 위해 2016년 6월1일부터 8월 3일까지 대전광역시에서 거주하며 치과에서 1회이상 진료를 받은 경험이 있는 만 19세 이상 성인 중 303명을 편의추출하여 설문조사하였다. 그 결과, 3회 이상 이를 닦는 대상자는 72.6%였으며 구강보조용품을 사용하는 대상자는 55.8%였고 칫솔질 시간이 2분 이상인 대상자는 55.8%였다. 치면착색제 경험은 1일 칫솔질 횟수에 영향을 미쳤으며 치면착색제 경험, 칫솔질 교육, 구강보조용품 사용 교육, 치주질환 예방 교육은 구강보조용품 사용과 1회 칫솔질 시간에 영향을 미쳤다. 계속구강건강관리 프로그램이 필요하다고 생각하는 대상자는 93.1%였으며 계속구강건강관리프로그램 참여의향은 68.0%였다. 계속구강건강관리 프로그램 1회 참여비용은 1만원 이상 2만원 미만이 70.3%로 가장 많았으며 관리주기는 6개월이 42.6%로 가장 많았다. 계속구강건강관리 프로그램 요구도는 구강세균검사 74.3%, 칫솔질 교육 71.6%, 구취검사 69.3%, 구강보조용품 교육 46.9%, 치면세균막검사 42.9%, 타액검사 37.6% 순이었다. 계속구강건강관리 프로그램 필요성 인지에 영향을 미치는 요인은 고졸 이하에 비해 대졸 이상 4.514배, 구강보조용품을 사용하지 않은 군에 비해 사용하는 군이 2.878배, 칫솔질 시간이 2분 미만군에 비해 2분 이상군이 3.138배 필요성 인지가 높았다. 계속구강건강관리 프로그램 참여 의향에 영향을 미치는 요인은 치주질환 예방 교육 경험이 없는 군에 비해 예방교육 경험이 있는 군이 1.915배 높았으며 구강보조용품 사용을 하지 않는 군에 비해 사용하는 군이 2.065배 높았다. 따라서, 치과에 내원하는 환자에게 지속적으로 구강보건교육을 하는 것이 계속구강건강관리 프로그램에 참여율을 높일 수 있다고 생각되었다. 또한, 구강세균검사나 구취검사 등이 성인 계속구강건강관리 프로그램에 포함되는 것이 추천되며 계속구강건강관리 프로그램이 본인이 부담할 수 있는 적정 비용 수준으로 보험 급여화될 수 있도록 제안해야 한다. Dental caries and periodontal disease are considered to be chronic, but can be prevented through an incremental oral health program covering all ages. The National Oral Health Program for adults provides oral health exam and scaling, and is covered by national health insurance for those over 20 years of age in Korea. The aim of this study was to collect basic data for developing an oral health program for adults by identifying factors related to awareness and need. The data were obtained by convenience sampling of 303 subjects. The use of dental plaque disclosing agents affected tooth brushing frequency, toothbrushing time and use of oral auxiliary devices. Education on toothbrushing methods affected toothbrushing time and use of oral auxiliary devices. Of those surveyed, 93.1% replied that an incremental oral health program for adults was needed, and 68.0% intended to participate. In a regression model, the factors that had an effect on the perceived need for an oral health program were education level, use of oral hygiene auxiliary devices, and toothbrushing time, and the factors affecting intent to participate were education for prevention of periodontal disease and the use of oral hygiene auxiliary devices. The subjects stated that the following oral health programs were needed: an oral bacteria exam (74.3%), toothbrushing education (71.6%), a bad breath exam (69.3%), education on use of oral hygiene auxiliary devices (46.9%), a dental plaque exam (42.9%) and a saliva exam (37.6%). Oral health education appears to be an important factor for participation in an incremental oral health program.
곽민호(Min-Ho Kwak),이영빈(Yeong-Bin Lee),이정욱(Jung-Uk Lee),김규홍(Kyu-Hong Kim),이동호(Dong-Ho Lee),정형석(Hyoung-Seog Chung),장영일(Young-Il Jang),권혁빈(Hyeok-Bin Kwon) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Wind tunnel tests are performed so as to investigate the aerodynamic drag characteristics of HEMU-400x, next generation Korean high speed train. The experiments of 1/20 scaled 5-car train model are done at 30, 40, 50, 60m/s with a normal bogie, a bogie cover, and a streamlined shape. The flat plate with knife edge are installed to minimize the effect of boundary layer of wind tunnel for the train model. The aerodynamic drag reduction was more by a streamlined shape than by a bogie cover from a normal bogie. Based on the experimental results, the aerodynamic drag of HEMU-400x test train(6-car) was predicted. It is prediceted that More bogie cover could reduce more aerodynamic drag of the test train in replacement of normal bogies.