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Yong-Lee의 익명 핑거프린팅 프로토콜의 안전성 취약점 및 개선 방안
손기욱(Kiwook Sohn),이윤호(Yunho Lee),원동호(Dongho Won) 한국정보보호학회 2006 정보보호학회논문지 Vol.16 No.6
2005년, Yong과 Lee는 buyer-seller 핑거프린팅 프로토콜을 제안하면서, 대칭(symmetric) 암호계와 가환 (commutative) 암호계를 이용하기 때문에 속도가 빠르고 익명성을 갖는다고 주장한 바 있다. 그러나 이 방식은 공격자가 man-in-the-middle 방법을 이용하여 공격할 경우 정당한 사용자의 핑거프린트가 포함된 콘텐츠를 얻을 수 있는 문제가 있다. 본 논문에서는 Yong-Lee 방식의 안전성 취약점을 살펴보고 이를 막을 수 있는 방안을 제시한다. In 2005, Yong and Lee proposed a buyer-seller fingerprinting protocol using symmetric and commutative encryptions. They claimed that their protocol was practical and anonymous since they used symmetric and commutative encryptions. However, an attacker can get the content embedded with one or more honest buyers' fingerprints using man-in-the-middle attack. In this letter, we point out the weakness and propose methods for improving to their protocol.
Lee, Youngjeon,Lee, Seunghoon,Lee, Sang-Rae,Park, Kanghui,Hong, Yunkyung,Lee, Minkyung,Park, Sookyoung,Jin, Yunho,Chang, Kyu-Tae,Hong, Yonggeun Molecular Diversity Preservation International (MD 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.2
<P>Endogenous neural stem/progenitor cells (eNSPCs) proliferate and differentiate into neurons and glial cells after spinal cord injury (SCI). We have previously shown that melatonin (MT) plus exercise (Ex) had a synergistic effect on functional recovery after SCI. Thus, we hypothesized that combined therapy including melatonin and exercise might exert a beneficial effect on eNSPCs after SCI. Melatonin was administered twice a day and exercise was performed on a treadmill for 15 min, six days per week for 3 weeks after SCI. Immunohistochemistry and RT-PCR analysis were used to determine cell population for late response, in conjunction with histological examination and motor function test. There was marked improvement in hindlimb function in SCI+MT+Ex group at day 14 and 21 after injury, as documented by the reduced size of the spinal lesion and a higher density of dendritic spines and axons; such functional improvements were associated with increased numbers of BrdU-positive cells. Furthermore, MAP2 was increased in the injured thoracic segment, while GFAP was increased in the cervical segment, along with elevated numbers of BrdU-positive nestin-expressing eNSPCs in the SCI+MT+Ex group. The dendritic spine density was augmented markedly in SCI+MT and SCI+MT+Ex groups. These results suggest a synergistic effect of SCI+MT+Ex might create a microenvironment to facilitate proliferation of eNSPCs to effectively replace injured cells and to improve regeneration in SCI.</P>
Bovine tuberculosis in an Asian small-clawed otter (<i>Aonyx cinerea</i>) in the Republic of Korea
Lee, Hyunkyoung,Kim, Jae-Myung,Jang, Yunho,Lee, Kyunghyun,Baek, Kanghyun,Lee, Boram,Kim, Ha-Young,Lee, Myoung-Heon,Ryoo, Soyoon,Bae, You-Chan,Choi, Eun-Jin,So, ByungJae SAGE Publications 2015 Journal of veterinary diagnostic investigation Vol.27 No.5
<P>Bovine tuberculosis caused by <I>Mycobacterium bovis</I> has a wide range of hosts including cattle and humans, but its incidence in otters is very rare. Our report describes a case of bovine tuberculosis in an Asian small-clawed otter (<I>Aonyx cinerea</I>). A deceased female otter ~2–3 years of age that was raised in an aquarium was submitted to the Animal and Plant Quarantine Agency (Anyang, Republic of Korea) for autopsy in June 2013. Following gross pathological examination, many white nodules were observed in the lungs and mesentery. The nodules showed central necrosis infiltrated with lymphocytes and macrophages and surrounded by fibrous tissue. Acid-fast bacteria were detected in the necrotic foci, but no fungi were observed. Molecular analysis led to the detection of <I>M. bovis</I>, which is identified in otters in some European countries such as Spain and France.</P>
Han Hee Lee,Bo In Lee,Jung Wook Kim,임현,Si Hyung Lee,Jun Hyung Cho,Yunho Jung,Kyoung Oh Kim,Chan Gyoo Kim,Kee Myung Lee,Jong-Jae Park,Myung-Gyu Choi,Hoon Jai Chun,Ho Gak Kim 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.3
Background/Aims: The aim of this in vivo animal study was to evaluate the effectiveness and safety of dedicated cold snare (DCS)compared with those of traditional snare (TS) for cold snare polypectomy (CSP). Methods: A total of 36 diminutive (5 mm) and 36 small (9 mm) pseudolesions were made by electrocoagulation in the colons ofmini-pigs. Results: For the diminutive lesions, there were no significant differences in technical success rate, procedure time, or completeresection rate between the DCS and TS groups; the rate of uneven resection margin in the DCS group was significantly lower thanthat of the TS group. For small lesions, technical success rate and complete resection rate were significantly higher in the DCS groupthan in the TS group (100% [18/18] vs. 55.6% [10/18], p=0.003; 94.4% [17/18] vs. 40% [4/10], p=0.006). In addition, the procedureduration was significantly shorter, and the rate of uneven resection margin was significantly lower in the DCS group (28.5 sec vs. 66.0sec, p=0.006; 11.1% [2/18] vs. 100% [10/10], p<0.001). Two cases of perforation occurred in the DCS group. Multivariate analysisrevealed that DCS use was independently associated with complete resection. Conclusions: DCS is superior to TS in terms of technical success, complete resection, and reducing the duration of the procedure forCSP of small polyps.
나노섬유 멤브레인 기반 무동력 정수 시스템의 적정기술 및 현장 적용
이진(Jin Lee),윤병권(Byeong Gweon Yun),한경구(Kyoung Gu Han),이승훈(Seung Hoon Lee),김철현(Cheol Hyeon Kim),김찬(Chan Kim),이윤호(Yunho Lee),이동휘(Dongwhi Lee),이승혁(Seunghyeok Lee),김경웅(Kyoung-Woong Kim) 적정기술학회 2021 적정기술학회지(Journal of Appropriate Technology) Vol.7 No.1
안전한 음용수 확보를 위한 적정기술로써 환경적, 기술적 요구사항을 충족할 수 있는 나노섬유 멤브레인으로 구성된 무동력 막 여과 시스템을 평가하였다. 이 장치는 수두차에 의한 중력과 생물학적 막 오염층 제어로 별도의 에너지원이 필요 없고, 핵심 소재인 PVDF 나노섬유 멤브레인 필터가 병렬로 연결, 모듈화되어 있어 물 생산성을 높이는 구조이다. 이 장치의 실제 현장 적용 가능성을 평가하기 위해 Pilot-scale (3000-5000 L/day) 나노섬유 멤브레인 기반 정수 시스템이 개발도상국(키리바시, 투발루 등)에 2017년 8월 설치되어 3개월간 운영되었다. 14-92 L/(m2×h)의 플럭스로 안정적 물 생산성을 확인하였고 처리수의 탁도와 박테리아의 높은 제거율 (99.99% 이상)로 안전한 수질을 장기간 제공할 수 있음을 확인하였다. 이러한 결과는 현장 적용을 통해 나노섬유 멤브레인 기반 무동력 정수 시스템이 장기간 안전한 음용수를 공급할 수 있는 정수장치로 평가되었고, 적정기술로써 개도국의 수처리 장치로 활용 가능성을 보여 준다. Gravity-driven membrane (GDM) filtration system based on the nanofiber membrane was investigated. This system can be operated with little energy demand due to a gravitational pressure-driven filtration and biological fouling control strategy. Moreover, the optimal module configuration based on the high permeance of nanofiber membrane can provide a significantly high water productivity. In order to evaluate its applicability potential, the pilot-scale (3000-5000 L/day) systems with nanofiber membranes were operated in developing countries (Kiribati and Tuvalu). Our results showed that the 14- 92 L/(m2×h) of the permeate flux was determined indicating a stabilized water productivity. In addition, the permeate water indicated a high removal rate (more than 99.99%) of turbidity and bacteria. Consequently, the system can provide a stabilized water production with safe permeate water quality during long-term operation. These findings exemplify an effective approach to decentralized drinking water treatment for developing countries.