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관상동맥우회 이식편으로서의 우위대망동맥의 조직학적 특징
이현우,송현,유동곤,임한중,이재원,송명근,Lee, Hyun-Woo,Song, Hyun,Yoo, Dong-Gon,Lim, Han-Jung,Lee, Jae-Won,Song, Meong-Gun 대한흉부심장혈관외과학회 1999 Journal of Chest Surgery (J Chest Surg) Vol.32 No.10
Long term patency of arterial graft has been better than venous graft and redo coronary artery bypass grafting has been increasing, therefore, there has been an increasing need for alternative arterial grafts except internal thoracic artery(ITA). Material and Method: Right gastroepiploic arteries(RGEA) were harvested from 100 patients who had received gastrectomy for gastric cancer or ulcer. ITAs were obtained from 10 patients undergoing coronary artery bypass grafting. The length of RGEA was measured from the pyloric ring. Items of the morphometric and histologic study at the pyloric ring and sites of the 10cm and 20cm RGEA from the pyloric ring were luminal diameter, intimal thickness, medial thickness, wall thickness, degree of intimal hyperplasia, intimal thickness, medial thickness, wall thickness, degree of intimal hyperplasia, intimal thickness index, medial thickness index, and the number of discontinuities of the internal elastic lamina. Similar items were applied to the proximal site of ITAs. Result: The length of RGEA was 23${\pm}$2.7cm(range 17∼31cm). Comparing the 20cm RGEA with ITA, intimal thickness, medial thickness, wall thickness, and degree of intimal hyperplasia did not show any difference(p>0.05). However, 20cm RGEA was greater than ITA at the luminal diameter, intimal thickness index, and the number thickness and wall thickness in each site of the RGEA(pyloric ring, 10cm, 20cm) decreased from the pyloric ring to the distal sites(p<0.05). The degree of intimal hyperplasia and the number of discontinuities of the internal elastic lamina did not show any difference between the pyloric ring and 10cm, however, those of 20cm were smaller than these sites(p<0.05). RGEA had more number of discontinuities of the internal elastic lamina and rich smooth muscle cells in the media than ITA. Conclusion: The length and diameter of RGEA is good enough to reach most of the coronary arteries. Moreover, long term patency of RGEA may be improved, if anastomosed in the distal site.
이현우,우영회,이종원,Hyun Woo Lee,Young Hoe Woo,Jong Won Lee 국립한국농수산대학교 교육개발센터 2023 현장농업연구지 = Journal of practical agricultural resear Vol.25 No.1
In summer, the natural ventilation performance for varying greenhouse width is very important in the glasshouses for year round cultivation. The effect of the side openings and greenhouse width on natural ventilation performance was analyzed by simulation. The necessary ventilation rate with different solar radiation transmittance increased significantly when the outside temperature grows higher. The necessary ventilation rate of 40% transmittance was about half of that of 90% transmittance. In consequence, shading effect on temperature control in greenhouse is significant in summer. When the total area of the openings for ventilation is constant, the maximum ventilation rate happens when the area of roof openings is equal to the area of side openings. This maximum ventilation rate is about 3 times of that of the greenhouse with roof openings and without side openings. Therefore, the side openings are advantageous to improve the natural ventilation in greenhouses. As the greenhouse width increases, the influence of side openings on the ventilation rate is becoming smaller. If the natural ventilation rate of the greenhouse with roof and side openings is to become double of that of the roof openings only, the width should be narrower than 38.4m for the Venlo type and 64m for Wide span type.
이현우,전우용,이오연,설경원,Lee Hyun-Woo,Jeon Woo-yong,Lee Oh-yeon,Seol Kyeong-won 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.5
The purpose of the present study is to determine an optimum composition using cheaper powders keeping with high performance of hard rock cutting diamond saw blade. With 50Fe-20(Cu . Sn)-30Co specimen, a part of Co was replaced by Ni(5%, 10%, and 15%, respectively). These specimens were hot pressed and sintered for predetermined time at various temperature. Sintering is performed by two different methods of temperature controlled method and specimen dimension controlled method. In order to determine the property of the sintered diamond saw blade, 3 point bending tester, X-ray diffractometer, and SEM were used. As the Co in the bond alloy was replaced by Ni, the hardness of the specimen increased. Thus the 50Fe-20(CuㆍSn)-15Co-15Ni specimen showed the maximum hardness of 104(HRB). The results of 3 point bending test showed that flexure strength decreased along with increase in Ni content. This is attributed to the formation of intermetallic compound(Ni$_{x}$Sn) determined by X-ray diffraction. The fracture surface after 3 point bending test showed that diamond was fractured in the specimen containing 0%, 5%, and 10%Ni, and the fracture occurred at the interface between diamond and matrix in the specimen containing 15%Ni. The cutting ability test showed that the abrasive property was not changed in the specimen containing 0%, 5%, and 10%Ni. The optimum composition determined in this study is 50Fe-20(CuㆍSn)-20Co-10Ni.
김주필(Joo Pil Kim),정혜리(Hye ri Jeong),김대희(Dae Hee Kim),박동우(Dong Woo Park),서재웅(Jae Woong Seo),이현우(Hyun woo Lee) 한국거미연구소 2017 한국거미 Vol.33 No.1
2016년 3월 31일부터 7월 31일까지 서울특별시 서초구 서초동에 위치한 서울고등학교 교정 일대를 서울고등학교 환경생물부 부원들이 채집 조사한 결과 20과 43속 53종의 거미가 조사 연구되어 이에 보고하는 바이다. From March 31st to July 31st in 2016, members of an environmental biology club at Seoul High School located in Seocho-gu, Seoul, Dae-Hee Kim, Dong-Woo Park, Jae-Woong Seo and Hyun-woo Lee, collected 20 families 43 genera 53 species of spiders and report the result of the study here.
이현우,차정원,Lee, Hyun-Woo,Cha, Jeong-Won 대한음성학회 2008 말소리 Vol.65 No.-
In this work, we propose an automatic word spacing system for Korean using conditional random fields (CRFs) with Korean features. We map a word spacing problem into a classification problem in our work. We build a basic system which uses CRFs and Eumjeol bigram. After then, we analyze the result of inner-test. We extend a basic system added by some Korean features which are Josa, Eomi and two head Eumjeols of word extracting from lexicon. From the results of experiment, we can see that the proposed method is better than previous methods. Additionally the proposed method will be able to use mobile and speech applications because of very small size of model.
이열 하악관(Bifid Mandibular Canal): 방사선적 소견과 임상적 의의 -증례보고-
이현우,김여갑,이백수,권용대,최병준,김영란,Lee, Hyun-Woo,Kim, Yeo-Gab,Lee, Baek-Soo,kwon, Yong-Dae,Choi, Byung-Jun,Kim, Young-Ran 대한치과마취과학회 2009 Journal of Dental Anesthesia and Pain Medicine Vol.9 No.1
When performing the inferior alveolar nerve block anesthesia, surgeon often faced a difficulty of the surgical operation due to the incomplete anesthesia. One of the reason is the variety of mandibular canal anatomy. Up to now, there are some reports of index cases about bifid mandibular canal among mandibular canal anatomic variation, and some classification is applied according to anatomical location and configuration. When surgical operation is performed involving mandible such as dantal implant treatment, extraction of an impacted third molar, sagittal split ramus osteotomy, etc, the position of mandibular canal should be considered. Bifid mandibular canal clinically causes troublesome cases of anesthesia when inferior alvelor nerve block, especially is performed extraction of an impacted third molar. Therefore, It is important for clinicians to recognize the presence of bifid canals on radiographys. Nowadays, the position of mandibular canal can be measured precisely by using Dental CT. It is not found by panorama image but is found by Dental CT sometimes. Among the patients, which take panorama and Dental CT simultaneously, for tooth extraction of lower impacted third molar in our department, we report the case that did not identifying in panorama but identifying it in Dental CT.
USN에서 중간 노드에서의 보고서 검증 시도 확률 평가 함수를 이용한 에너지 효율 향상 기법
이현우,문수영,조대호,Lee, Hyun-Woo,Moon, Soo-Young,Cho, Tae-Ho 한국시뮬레이션학회 2011 한국시뮬레이션학회 논문지 Vol.20 No.4
무선 센서 노드들은 개방된 환경에서 동작하기 때문에 외부의 물리적인 공격에 매우 취약하다. 공격자는 노드들을 훼손시켜서 센서 네트워크에 허위 보고서를 주입시킬 수 있다. 이러한 공격들은 센서 노드들의 에너지를 고갈시킨다. 이에 대응하는 보안 기법으로 Ye등은 중간 노드가 일정한 확률로 보고서를 검증하는 통계적 여과 기법을 제안하였다. 통계적 여과 기법은 모든 중간 노드가 같은 확률로 보고서 검증을 수행한다. 따라서 정상 보고서와 허위 보고서를 검증하는데 같은 에너지가 소모 되므로 정상 보고서를 검증하는데 불필요한 에너지를 소모하게 된다. 본 논문에서는 각 중간 노드가 보고서 검증 시도 확률을 조절하여 센서 노드들의 에너지 소모량을 줄이는 기법을 제안한다. 보고서 검증 시도 확률은 한 노드의 잔여 에너지양, 현재 노드에서 기지 노드까지의 홉 수, 허위 보고서의 비율에 의해 결정된다. 보고서 검증 시도 확률을 조절하여 통계적 여과 기법과 비슷한 보안성을 유지하면서 에너지의 효율성을 높일 수 있다. Wireless sensor nodes operate in open environments. The deployed sensor nodes are very vulnerable to physical attacks from outside. Attackers compromise some sensor nodes. The compromised nodes by attackers can lead to false data injection into sensor networks. These attacks deplete the limited energy of sensor nodes. Ye et al. proposed the Statistical En-Route Filtering (SEF) as a countermeasure of the attacks. The sensor node in SEF examines the event reports based on certain uniform probability. Thus, the same energies are consumed in both legitimate reports and false reports. In this paper, we propose a method that each node controls the probability of attempts to verify a report to reduce energy consumption of sensor nodes. The probability is determined in consideration of the remaining energy of the node, the number of hops from the node to SINK node, the ratio of false reports. the proposed method can have security which is similar with SEF and consumes lower energy than SEF.
공중 무선랜 시스템에서 로밍을 고려한 사용자 인증방식의 설계 및 구현
이현우,김정환,류원,윤종호,Lee, Hyun-Woo,Kim, Jeong-Hwan,Ryu, Won,Yoon, Chong-Ho 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.8B
본 논문은 무선랜 기술을 활용한 초고속 무선인터넷 서비스에서 사용자 인증방식에 사용되는 프로토콜의 설계와 구현에 관한 것이다. IEEE 802.l1b를 기반으로 한 공중 무선랜 서비스는 최근 고속 무선 인터넷 접속 솔루션으로써 각광받고 있다. 공중 무선랜 환경에서는 특히 중앙 집중화된 인증방법과 향상된 보안대책이 필요하며 사용자 단말의 이동 시 로밍에 대한 보장이 요구된다. 본 논문에서는 IEEE 802.1x에 기반의 사용자 인증보안 기능을 설계하고 방법과 실제 임베디드 리눅스를 기반으로 한 무선랜 Access Point(AP)에서 구현하여 동작을 시험하였으며. 로밍 시 필요한 IAPP 절차에 대하여 검토하였다. 또한 업체를 통한 상용화를 진행하며, KT 네스팟 인증시스템과 정상적인 연동기능 및 관리기능이 동작함을 확인하였다. Currently, Wireless LAN(WLAN) service is widely deployed to provide high speed wireless Internet access through the mobile stations such as notebook and PDA. To provide enhanced security and user access control in the public WLAN area, WLAM access points should have the capability of IEEE 802.1x-based user authentication and authorization functionality. In this paper, we provide a brief understanding of IEEE 802. 1x standards and related protocols likeEAPoL(Extended Authentication Protocol Over LAN), EAP, RADIUS and describe how the IEEE 802.1x is designed and implemented in our embedded linux-based WLAN AP which is named i-WiNG.(Intelligent Wireless Internet Gateway).