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안전한 종합정보통신망을 위한 키 분배 프로토콜과 호 제어
정현철(Chung Hyun Cheol),신기수(Shin Ki Soo),이선우(Lee Sun Woo),김봉한(Kim Bong Han),김점구(Kim Jeom Gu),이재광(Lee Jae Kwang) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.1
ISDN is network which has been developed to integrate and transfer some information(data, video, voice). In the ISDN, security problem that threat and intrusion about important information resource increase because every information is transferred in the form of digital and access of network has patency. In this paper, for protect important information resource, studied that apply application method and encryption system to ISDN, and ISDN system structure, ITU-T Q.931 protocol were analyzed, and proposaled encryption key distribution protocol, call control with hybrid encryption system for user information privacy to provide security service.
정현철(Chung Hyun Cheol),황부현(Hwang Bu Hyun) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.3
Security as well as consistency of data is very important issue in database security. Thus, the serializability of transactions must be maintained and particularly convert channel not caused between a high-level transaction and a low-level one. In this paper, we propose a secure transaction management algorithm using dynamic version control method that can slove disk space overhead to maintain multiversion and the problem that transactions read too old versions when two versions are maintained. Disk space overhead can be sloved by properly creating versions and dynamically maintaining the number of versions and the problem for reading too old version can be solved by having transactions read versions as recent as possible.
식도암에서 방사선 단독치료와 방사선 및 항암화학요법제 치료의 효과
천선희(Seon Hee Cheon),정현철(Hyun Cheol Chung),김주항(Joo Hang Kim),함영환(Yong Hwan Ham),박용준(Yong Jun Park),정재복(Jae Bock Chung),노재경(Jae Kyung Roh),이상인(Sang In Lee),박인서,최흥재,서창옥(Chang Ok Suh),김귀언(Gwi Eon Kim),노준규 대한내과학회 1988 대한내과학회지 Vol.35 No.5
N/A The role of adjuvant chemotherapy in the treatment of esophageal carcinoma was examined in a review of 84 patients. Between January 1984 to April 1988, 35 patients were treated with radiotherapy alone, 32 patients were treated with combined radiotherapy and chemotherapy (5-fluorouracil(5-Fu) and cisplatin), and 17 patients were untreated due to their economic problems. The 1 and 2-year survival rates among patients treated by radiation were 40% and 0%, respectively, whereas they were 28%, and 14% in patients treated with combined modality, and 40%, and 0% in patients without any treatment. In stage IV disease, the survivals at 1 and 2-years of patients with combined treatment were superior to the survivals of the radiotherapy alone treated group (p<0. 001), In both treatment groups, the actual survival rate was higher in patients with good Eastern Cooperative Oncology Group (ECOG) performance status (p<0.001). Treatment was well tolerated, and acute toxicity included esophagitis, stomatitis, and leukopenia. Late toxicities were predominantly manifestated as stricture, pneumonia, and mediastinitis. This combination of radiation therapy with infusional 5-FU and cisplatin is an effective and relatively well-tolerated regimen in the Treatment of esophageal cancer.
한국 여성골조송증환자들에서 보인 골조송증 위험인자 ( 예보 )
임승길(Sung Kil Lim),정현철(Hyun Cheol Chung),이미경(Mi Kyung Lee),김현만(Hyeon Man Kim),이현철(Hyun Chul Lee),허갑범(Kap Bum Huh),김남현(Nam Hyun Kim),박병문(Byeong Mun Park) 대한내과학회 1988 대한내과학회지 Vol.34 No.4
N/A We evaluated the risk factors of osteoporosis in thirty-eight osteoportic women and 38 age-matched control women. We employed a sensitive technique of dual photon absorptiometry to measure bone mineral density, and the osteoporsis was defined when the bone mineral density of the patients was below -2 standard deviation of decade-and sex-matched control value. The patients group showed relatively low frequency of full term delivery, and less daily activity, They also tended to show dietary deficiency of calcium, protein, vitamin-C, and longer duration of menopause. Meanwhile, anthrophometric measurements, frequency of pregnancy and breast-feeding, amouot of caffeine intake, smoking and alcohol drinking are not significantly differerent between the two groups. In conclusion, the subjects with such risk factors in addition to known secondary cause of osteoporosis need a screening test for detecting osteoporsis and the medical advice of hormonal replacement and exercise should be encouraged for the subjects of impending osteoporosis.
진행암에서 Recombinant Human Interferon Alpha ( Rifn α ) 의 Phase 1 임상 및 약물동태에 관한 연구
노재경(Jae Kyung Roh),정현철(Hyun Cheol Chung),박용준(Yong Jun Park),김주항(Joo Hang Kim),김병수(Byung Soo Kim),현형환(Hyung Hwan Hyun) 대한내과학회 1989 대한내과학회지 Vol.37 No.1
N/A Fifteen patients with advanced cancers wre treated with recombinant interferon alpha (Alphaferon, Cheil Sugar Co.) by IM routes daily 5 times a week with the dose of either 3, 5, or 7´106 IU/m2 without intrapatient escalation in order to determine the tolerance and pharmacokinetics of IFN. Of the enrolled 15 patients, 12 patients were evaluable for toxicities and responses. Enrolled diseases were malignant melanoma (3), renal cell carcinoma (3), cutaneous T-cell lymphoma (3), non-small cell lung cancer (2), CML (1), breast cancer (1), stomach cancer (1), and fibrosarcoma (1). The median duration of treatment was 2 months. Of the evaluable 4 patients with the 3´105IU/m2 dose, a mild degree of flu-like syndrome in all, nausea and vomiting (severe; 1) in 3 and a mild degree of reversible elevation of hepatic transaminases was observed in 1 patient. Of the evaluable 6 patients with 5´106 IU/m2 dose, mild to moderate degree of flu-like syndrome in all, mild degree of reversible elevation of hepatic transaminases in 1, and mild degree of leukopenia in one patient was observed. Of the evaluable 3 patients with 7´108 IU/m2, severe flu-like syndrome in all, and moderate degree of leukopenia was observed in 2 patients which required dose modification. One patient with malignant melanoma showed partial response of the metastatic lymph nodes more than 12 months. Serum peak concentration of IFN was reached 4-8 hours after the IM treatment and the serum concentration was declined slowly to less than 10% of the peak concentration by 24 hours. The 24-hour urinary excretion of IFN was less than 1% of administered dose. Alphaferon was tolerable to the patients without life threatening toxicities, and the suggested MTD was 6×106 IU/m2/D with this dose schedule.
엔트로피 값 변화 분석을 이용한 실행 압축 해제 방법 연구
이영훈(Young-hoon Lee),정만현(Man-Hyun Chung),정현철(Hyun-Cheol Jeong),손태식(Tae-shik Shon),문종섭(Jong-sub Moon) 한국정보보호학회 2012 정보보호학회논문지 Vol.22 No.2
악성코드의 탐지 및 분석 회피 기술 중 실행 압축 기술은 악성코드의 용량을 줄이고 분석가가 코드를 분석할 때 혼란을 주도록 코드를 변형하고 있다. 따라서 악성코드의 확산이 용이해지고 분석하는데 시간이 오래 걸려 신속한 대응이 어렵게 만들고 있다. 최근에는 이러한 실행 압축된 악성코드에 대응하기 위하여 실행 압축 해제 관련 연구가 진행되고 있다. 실행 압축 프로그램은 실행되면 실행 압축을 해제하게 된다. 실행 압축 해제 때 압축되어 있던 데이터가 해제 되면서 실행 압축 파일의 데이터가 변경되거나 추가되어 데이터의 변화가 생기게 된다. 이때 이러한 변화 때문에 실행 압축 파일의 엔트로피 값이 변화하게 된다. 실행 압축 해제가 끝나게 되면 이러한 데이터 변화가 끝나고 실제적인 프로그램이 수행되므로 엔트로피 값이 변화하지 않게 된다. 그러므로 이러한 성질을 이용하여 실행 압축 해제되는 시점을 찾게 되면 실행 압축 알고리즘에 상관없이 실행 압축을 해제 할 수 있게 된다. 본 논문에서는 실행 압축 파일의 압축 해제 때의 엔트로피 값 변화량을 보고 실행 압축 해제가 끝나는 시점을 판단하여 실행 압축을 해제하는 방법을 제안한다. Packing techniques, one of malicious code detection and analysis avoidance techniques, change code to reduce size and make analysts confused. Therefore, malwares have more time to spread out and it takes longer time to analyze them. Thus, these kind of unpacking techniques have been studied to deal with packed malicious code lately. Packed programs are unpacked during execution. When it is unpacked, the data inside of the packed program are changed. Because of these changes, the entropy value of packed program is changed. After unpacking, there will be no data changes; thus, the entropy value is not changed anymore. Therefore, packed programs could be unpacked finding the unpacking point using this characteristic regardless of packing algorithms. This paper suggests the generic unpacking mechanism using the method estimating the unpacking point through the variation of entropy values.