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.

침투트렌치 시설의 유출저감 효과 분석

연종상(Yeon, Jong Sang),장영수(Jang, Young Su),신현석(Shin, Hyun Suk),김응석(Kim, Eung-Sung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.9

도시화로 인한 도시유역의 불투수면적 증가에 따른 우수유출수 증가를 저감하기 위해 저영향개발의 계획 및 적용이 활발하게 진행되고 있다. 본 연구에서는 LID 요소기술 중 침투트렌치의 국내 적용성 및 성능검증을 위해 침투트렌치 실험 조건을 바탕으로 SWMM을 구축하여 유출량 및 비점오염원 저감효과를 분석하였다. SWMM의 침투트렌치 적용면적은 전체 유역면적의 5~15%의 면적에 적용하며 모의를 수행하였다. SWMM 모의결과 첨두유출량은 45.7~61.9%, 총유출량은 47.2~ 62.3%, BOD 부하량은 52.3~55.3%의 저감효율로 분석되었다. 실험결과와 비교하면 유출량의 경우 12~24% 크며, BOD 부하 량의 경우 37~38% 작게 산정되었다. 추후 침투트렌치의 적용성 및 성능검증에 도움을 줄 수 있을 것으로 판단된다. LID planning and application has been actively developed to reduce the runoff volume at increased impervious areas due to rapid urbanization. In this study, a performance and applicability evaluation was performed in an infiltration trench using the SWMM model, based on the experimental conditions for infiltration trenches. The infiltration trench application area was applied to 5~15% of the drainage area. The SWMM results of discharge and the BOD reduction efficiency were analyzed at a peak discharge of 45.7~61.9%, total discharge of 47.2~62.3%, and BOD load of 52.3~55.3. The discharge and BOD was estimated to be 12~24% higher and 37~38% smaller than the experimental results. This study can help in the application and performance evaluation of infiltration trenches.

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)

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)

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.

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

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)

간세포 특이 PTEN 결핍으로 유도된 지방간염 및 간세포암

연종은 ( JONG EUN YEON ) 대한소화기학회 2005 대한소화기학회지 Vol.45 No.5

노인에서의 만성 C형간염 치료

연종은(Jong Eun Yeon) 대한임상노인학회 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.

폐고무분말을 혼입한 UP 폴리머모르타르의 경화수축 및 부착강도

연규석 ( Yeon Kyu-seok ),김남길 ( Jin Nan-ji ),최종윤 ( Choi Jong-yun ),백종만 ( Beck Jong-man ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

In this study, the MMA-modified paste mixed waste rubber powder, which has a small elastic modulus and a large modification, was produced by using the soft unsaturated polyester resin(up) as a binder. Then the adhesive properties according to the matrices in both underwater and air-dry conditions and the hardening shrinkage according to the contents of shrinkage reducing agent(SRA) and of MMA were surveyed. The experimental results show that, regardless of humidity of matrices the adhesive strength of polymer concrete was larger than cement concrete. the adhesive strength of MMA content of 20% was larger than MMA content of 30%. regardless of matrix materials the adhesive strength in water condition were 20-30% comparing with the air-dry condition. The case of MMA content of 20% showed the largest adhesive strength. In the hardening shrinkage experiment, the hardening shrinkage reduced as MMA and SRA contents increased, and the decrease of the hardening shrinkage by SRA was larger.