다항식 해쉬함수를 이용한 RFID 인증 프로토콜

연용호(Yon, Yong-Ho),이선영(Lee, Sun-Yong),이종연(Lee, Jong-Yun),신문선(Shin, Moon-Sun) 한국산학기술학회 2009 한국산학기술학회 학술대회 Vol.- No.-

RFID 시스템은 RFID 태그, RFID 리더 , Back-end 서버로 이루어져서 짧은 거리의 무선통신을 통해정보를 인식하는 시스템이다. 최근 RFID기술은 다양한 응용 분야에서 활용되고 있으며 보안과 프라이버시 침해에 대한 우려와 문제점을 해결해야한다는 논의가 높아지고 있다. 본 논문에서는 중간자 공격및 재생공격에 대응할 수 있는다항식 해쉬함수를 이용한 강력한 상호인증 프로토콜을 제안한다. 본논문에서는 대량의 RFID 태그와 리더간 상호인증을 위해 다항식을 이용한 해쉬함수를 적용한다. 제안된 다항식 해쉬함수를 적용한 RFID 인증 프로토콜은 전체 시스템에 부담을 주지 않으면서 보안강화를 할 수 있는 인증 프로토콜이며 특히 태그 쪽에 컴퓨팅 오버헤드가 추가되지 않는다. 또한 공격자에게 공격이 어렵거나 불가능한 복잡도를 가지는 프로토콜이다.

적합성 함수를 이용한 2차원 저장소 적재 문제의 휴리스틱 알고리즘

연용호,이선영,이종연,Yon, Yong-Ho,Lee, Sun-Young,Lee, Jong-Yun 한국정보처리학회 2009 정보처리학회논문지B Vol.16 No.5

2차원 저장소 적재는 NP-hard 문제로서 그 문제의 정확한 해를 구하는 것이 어려운 것으로 알려져 있으며, 이의 더 좋은 해를 얻기 위해 유전자(genetic) 알고리즘, 시뮬레이티드 어닐링(simulated annealing), 타부서치(tabu search)등과 같은 근사적 접근법이 제안되어 왔다. 하지만 분지한계(branch-and-bound)나 타부서치 기법들을 이용한 기존의 대표적인 근사 알고리즘들은 휴리스틱 알고리즘의 해에 기반을 둠으로 효율성이 낮고 반복수행에 의한 계산시간이 길다. 따라서 본 논문에서는 이러한 근사 알고리즘의 복잡성을 간소화하고, 알고리즘의 효율성을 높이기 위해 적재가능성을 판단하는 적합성 함수(fitness function)를 정의하고 이를 이용하여 어떤 특정 개체의 적재영역을 판단하는데 영향을 주는 적재영역의 수를 계산한다. 또한, 이들을 이용한 새로운 휴리스틱 알고리즘을 제안하였다. 끝으로 기존의 휴리스틱 또는 메타휴리스틱 기법과의 비교실험을 통해 기존의 휴리스틱 알고리즘인 FFF와 FBS에 비해 97%의 결과가 같거나 우수하였으며, 타부서치 알고리즘에 비해 86%의 결과가 같거나 우수한 것으로 나타났다. The two-dimensional bin packing problem(2D-BPP) has been known to be NP-hard, and it is difficult to solve the problem exactly. Many approximation methods, such as genetic algorithm, simulated annealing and tabu search etc, have been also proposed to gain better solutions. However, the existing approximation algorithms, such as branch-and-bound and tabu search, have shown the low efficiency and the long execution time due to a large of iterations. To solve these problems, we first define the fitness function to simplify and increase the utility of algorithm. The function decides whether an item is packed into a given area, and as an important information for a packing strategy, the number of subarea that can accommodate a given item is obtained from the variant of the fitness function. Then we present a heuristic algorithm BF for 2D bin packing, constructed by the fitness function and subarea. Finally, the effectiveness of the proposed algorithm will be expressed by the comparison experiments with the heuristic and the metaheuristic of the literatures. As comparing with existing heuristic algorithms and metaheuristic algorithms, it has been found that the packing rate of algorithm BP is the same as 97% as existing heuristic algorithms, FFF and FBS, or better than them. Also, it has been shown the same as 86% as tabu search algorithm or better.

대한간학회지 제6차 춘계학술대회 초록집 : 구연 ; 만성 B형 간질환에서 Lamivudine투여 후 혈소판 수의 변화와 Thrombopoietin의 역할

연종은 ( Yeon Jong Eun ),김경오 ( Kim Gyeong O ),손수민 ( Son Su Min ),김윤홍 ( Kim Yun Hong ),공휘 ( Gong Hwi ),김지훈 ( Kim Ji Hun ),서연석 ( Seo Yeon Seog ),박상훈 ( Park Sang Hun ),권오상 ( Kwon O Sang ),변관수 ( Byeon Gwan S 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.1(S)

제5차 대한간학회 춘계학술대회 초록집 : 최근 한국인의 A형 간염 바이러스 감염의 역학 조사

연종은 ( Yeon Jong Eun ),권오상 ( Kwon O Sang ),박상훈 ( Park Sang Hun ),변관수 ( Byeon Gwan Su ),조경환 ( Jo Gyeong Hwan ),안형식 ( An Hyeong Sig ),김주현 ( Kim Ju Hyeon ),이창홍 ( Lee Chang Hong ) 대한간학회 1999 Clinical and Molecular Hepatology(대한간학회지) Vol.5 No.1(S)

SWMM 모형을 이용한 LID 요소기술의 공간적 분포에 따른 우수유출특성 분석

연종상(Yeon, Jong Sang),장영수(Jang, Young Su),이재혁(Lee, Jae-Hyuck),신현석(Shin, Hyun Suk),김응석(Kim, Eung-Sung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.6

도시화로 인한 도심유역 내 강우유출양상이 개발이전과 다른 양상을 보이므로, 도심유역 내 강우유출량을 저감하기 위해 집중형 유출 저감 시설이 시행되어왔다. 그러나 시설의 한계점 때문에 분산형 유출 저감 시설인 저영향개발(Low Impact Development; LID)의 계획 및 적용이 활발하게 진행되고 있다. 본 연구에서는 대표적인 LID 요소기술을 대상으로 공간적 분포에 따른 유출특성을 분석하였다. 대상유역은 동일한 유역 및 우수배수 특성을 지닌 5개의 소유역으로 구성하였 고, 대표적인 LID 요소기술로 선정된 옥상녹화와 투수성 포장의 적용위치 및 개수에 따른 2개의 시나리오에 대한 유출특성을 분석하였다. SWMM 모형적용 결과, 적용 소유역 1개당 옥상녹화의 경우 총 유출량은 11.07%, 첨두 유출량은 3.42% 저감되 었으며, 투수성포장의 경우 총 유출량은 18.09%, 첨두 유출량은 17.94% 저감되었다. 이와 같은 감소율은 적용 LID의 위치에 상관없이 일정하였고, 적용 LID의 개수에 따라 정비례하게 증가하였다. 옥상녹화와 투수성 포장에서 유출특성 저감률의 발생 차이는 각 방법의 매개변수인 수리전도도의 영향 때문인 것으로 판단된다. As the storm water runoff characteristics in urban areas have changed owing to urbanization, centralized facilities to reduce the urban flood runoff had been implemented. On the other hand, because they have their limitations, LID (Low Impact Development) of the distributed facilities for storm water runoff reduction is being actively planned and applied. The purpose of this study was to analyze the runoff characteristics for the spatial distribution of typical LID element techniques. This study set a study basin consisting of the five subbasins with the same basin and drainage systems, and analyzed the flood runoff characteristics from the two scenarios, one is for the locations and the other is for the number of green roofs (GR) and permeable pavement (PP), respectively, selected as typical LID element techniques. The SWMM implementation results showed that GR reduces 11.07% of the total and 3.42% of the peak amounts of storm water runoff, and PP leads to 18.09% of the total and 17.94% of the peak discharge reduction for a subbasin. Such a reduction rate is constant regardless of the LID locations, and increases linearly with the number of LID applications. The different runoff reduction rates between the GR and PP applications appear to be due to the effects of the different hydraulic conductivities in the control parameters for each LID.

만성 B형간염에서 B형간염 표면 항원 정량의 임상적 의의

연종은 ( Jong Eun Yeon ) 대한소화기학회 2014 대한소화기학회지 Vol.63 No.6

Since the discovery of HBsAg in the early 1960s, presence of HBsAg in serum has only served to diagnose hepatitis B. Recent development in the quantitative measurement of serum HBsAg has enabled us to improve our understanding on the management of chronic hepatitis B. The surface antigen (sAg) level is at its highest in immune tolerance phase and decreases to the lowest level in immune control/inactive phase when HBeAg is cleared from the serum. Combination of serum sAg titer less than 1,000 IU/mL and serum HBV DNA less than 2,000 IU/mL can identify true inactive carrier from e antigen (eAg) negative hepatitis with diagnostic accuracy of 95%. During the natural course of chronic hepatitis B, changes or absolute level of sAg less than certain level can predict spontaneous sero-clearance of HBsAg. Although the decline of sAg is very slow in interferon (IFN)/pegylated interferon (PEG-IFN) or oral nucleos(-t)ide treated patients, interferon based therapy results in a greater decrease of sAg level and sAg loss. Lack of any decline in sAg titer during PEG-IFN therapy could identify the group of patients who do not response to IFN/PEG-IFN therapy. With the aid of serum HBV DNA, quantitative measurement of serum HBsAg level can be used to optimize the management of chronic hepatitis B in our daily practice. (Korean J Gastroenterol2014;63:335-340)

장결핵의 감별진단에 있어서 3 개월 추적 대장내시경 검사의 의의

연종은(Jong Eun Youn),박이병(Ie Byung Park),권소영(So Yung Kwon),김재선(Jae Seon Kim),변관수(Kwan Soo Byun),박영태(Young Tae Bak),김종극(Jong Guk Kim),이창홍(Chang Hong Lee),김진호(Jin Ho Kim) 대한내과학회 1996 대한내과학회지 Vol.50 No.2

N/A Objectives: A therapeutic trial with antituberculous drugs is reasonable if the clinical and colonoscopic features are compatible, in countries with a high prevalence of intestinal tuberculosis. But Crohn's disease, lymphoma and other infectious disease should be differentiated from the disease. There have been no established monitoring modalities to assess the efficacy of the therapeutic trial and to differentiate these diseases yet. Therefore, this study was done to assess the usefulness of follow-up colonoscopy at 3 months of antituberculous treatment as a monitoring modality. Methods: 42 patients with tentative diagnosis of intestinal tuberculosis which was made on the basis of clinical and colonoscopic findings were enrolled, The patients were divided into 2 groups according to the symptomatic improvement after the therapy : (A) 30 patients with improved symptom : (B) 12 patients with persistent symptom. Colonoscopy with biopsy was performed before and at 3 months of therapeutic trial. Standard four-drug antituberculous chemotherapy was done at least for 9 months and patients were followed for more than a year after completion of therapy. Final diagnoses were made on the basis of satisfactory outcome of therapeutic trial, operative findings and another follow-up colonoscopy. Results: 1) colonscopic findings at 3 months of therapy improved in 31 cases. 27 of them were finally diagnosed as tuberculosis, 1 was as ulcerative colitis and 3 were lost. Among 11 endoscopically unimproved cases, 7 were finally diagnosed as Crohn's disease, 2 were as tuberculosis and 2 were lost. 2) 27 of 29 patients with final diagnosis of intestinal tuberculosis improved colonoscopically at 3 months of therapy. 2 unimproved cases had a complicated disease(stenosis) or an atypical mycobacterial infection, respectively. 3) In group A, 1 was diagnosed as ulcerative colitis and in group H, 3 were diagnosed as tuberculosis finally. Conclusion: Follow-up colonoscopy at 3 months of antituberculous therapeutic trial in patients with tentative diagnosis of intestinal tuberculosis seems to be a valuable modality for monitoring the efficacy of therapy and differentiating intestinal tuberculosis from other diseases.

e-Seal을 위한 다항식 해시 함수를 이용한 암호화기법 연구

연용호(Yon, Yong-Ho),신문선(Shin, Moon-Sun),이종연(Lee, Jong-Yun),황익수(Hwange, Ik-Soo),석창부(Seok, Changk-Boo) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.8

e-Seal은 RFID기술을 사용하여 원격에서 자동으로 봉인상태를 확인할 수 있는 컨테이너 봉인 장치를 말한 다. RFID의 특징상 반도체 칩에 기록된 정보를 제 삼자가 쉽게 판독 및 변조할 수 있다는 취약점을 가지고 있다. 이 러한 RFID 취약점을 해결한 e-Seal 인증 프로토콜을 적용하기 위해서는 e-Seal과 리더 간의 데이터를 암/복호화를 위 한 PRF를 이용한다. 기존의 PRF에 사용되는 해시함수는 일방향 해시함수로써 e-Seal에 사용되기는 부적합하며 강력 한 해시함수가 요구된다. 해시 함수는 데이터 무결성 및 메시지 인증, 암호화 등에서 사용할 수 있는 함수로써 정보 보호의 여러 메커니즘에서 이용되는 핵심요소기술이다. 따라서 본 논문에서는 e-seal 인증 프로토콜을 위한 다항식을 기반으로 하는 강력한 해시함수를 제안한다. An e-Seal is an active RFID device that was set on the door of a container. e-Seal provides both the state of the seal and the remote control of the device automatically. But it has vulnerabilities like eavesdrop and impersonate because of using RFID system. A secure e-Seal authentication protocol must use PRF for encryption/decryption of reader and e-Seal. The existing PRF uses simple hash function such as MD5 or SHA which is not available for e-Seal. It is required to use strong hash functions. The hash function is a essential technique used for data integrity, message authentication and encryption in the mechanism of information security. Therefore, in this paper, we propose more secure and effective hash function based on polynomial for e-Seal authentication protocol.

MMA 개질 강화 플라스틱 복합관의 휨강성

연규석(Yeon, Kyu Seok),최종윤(Choi, jong Yun),백종만(Beck, Jong Man),권택정(Kweon, Taek Jeong),정중호(Jeong, Jung Ho) 한국콘크리트학회 2003 한국콘크리트학회 학술대회 논문집 Vol.2003 No.11

노인에서의 만성 C형간염 치료

연종은(Jong Eun Yeon) 대한임상노인의학회 2023 대한임상노인의학회지 Vol.24 No.3

Worldwide, more than 100 million people were infected with chronic hepatitis C (CHC). Prevalence in Korea was estimated at as much as 0.6%. Because of the progressive aging of hepatitis C virus-infected people, the number of cases of CHC in older adults has been increasing. In older patients with CHC, greater acceleration of fibrosis with aging and higher risk of hepatocellular carcinoma development have been reported. Currently, with the popular all-oral combination of direct-acting antiviral (DAA) treatment of CHC, the rates of sustained virologic response and treatment-related adverse events between patients younger and older than 65 years are not significantly different. Although clinicians should consider drug-drug interactions, comorbid medical condition, risk of disease progression, and long-term benefits of viral eradication by DAA, older age should not be a barrier to treatment.