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IPv6 전환 기술의 보안 위협 분석 및 보안 설계에 대한 연구
최인석,김영한,정수환,Choi, In-Seok,Kim, Young-Han,Jung, Sou-Hwan 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.11B
IPv4로부터 IPv4/IPv6로의 전환 및 상호공존을 위한 처리 과정에서의 보안적인 고려는 상당히 중요한 문제이다. IPv4 네트워크와 IPv6 네트워크 사이의 이질적인 문제로 인해 기존의 IPv4 네트워크에서는 일어나지 않았던 다양한 위협이 존재한다. 본 논문에서는 지금까지 제안된 IPv4/IPv6 전환 기술에 대해 살펴보고, 전환 기술에서 나타날 수 있는 다양한 보안적인 위협에 대해서 분석을 하고, 그에 대한 대응방안에 대해 제시하였다. 6to4 전환기술에서는 DoS 및 DRDoS 공격 위협을 분석하고, 주소 무결성 검사방법을 해결책으로 제시하였다. 또, DSTM과 NAT-PT 전환 기술에서는 IPv4 주소를 할당하는 IPv4 주소 pool을 가진 서버에 대한 IPv4 주소 고갈 위협을 분석하였고, IPv4 주소 고갈 위협 문제를 해결하기 위해서 DSTM 전환 기술에서는 challenge-response 메커니즘 방안을 제시하였다. The IETF has created the v6ops Working Group to assist IPv6 transition and propose technical solutions to achieve it. But it's quite problem which security consideration for a stage of IPv4/IPv6 transition and co-existence. There are new security problem threat that it caused by the characteristics of heterogeneity. In this paper, we describe IPv6 transition mechanisms and analyze security problem for IPv6 transition mechanism. also we propose security consideration and new security mechanism. We analyzed DoS and DRDoS in 6to4 environment and presented a address sanity check as a solution. We also showed an attack of address exhaustion in address allocation server. To solve this problem, we proposed challenge-response mechanism in DSTM.
유두상 갑상선암종 환자의 수술요법 후 혈청 타이로글로불린
최인석,예병국,한군택,심문섭,In Seok Choi,M,D,Byung Kook Yea,M,D,Koon Taek Han,M,D,and Mun Sup Sim,M,D 대한갑상선-내분비외과학회 2001 The Koreran journal of Endocrine Surgery Vol.1 No.2
Purpose: Postoperative serial serum thyroglobulin (Tg) measurements on levothyroxine (L-T<SUB>4</SUB>) therapy in patients with differentiated thyroid carcinoma (DTC) is known to be useful in monitoring tumor progression or regression. The objective of this study was to evaluate the significance of serum Tg levels on L-T<SUB>4</SUB> therapy after surgery. Methods: To determine the basal serum Tg levels on L-T<SUB>4</SUB> therapy after surgery in patients with DTC, Tg levels during the initial 2 year-period after surgery were analyzed retrospectively in 37 patients who had undergone a total thyroidectomy for papillary thyroid carcinoma with (Group 2) or without (Group 1) palpable cervical lymph node metastasis. The Tg levels had been measured 1 to 4 times for each patient with total of 53 and 35 times in Group 1 and Group 2 respectively. Results: The basal Tg levels in Group 1 were all less than 4 ng/mL with 79.3% less than 2 ng/mL, and those in Group 2 were all less than 9 ng/mL with 71.4% less than 2 ng/mL. Conclusion: The data suggests that the postoperative serum Tg level of 10 ng/mL can be a useful reference value in long-term follow-up after total thyroidectomy for patients with DTC. (Korean J Endocrine Surg 2001;1:255-258)
유방암으로 항암 치료받는 환자에서 발생하는 과도한 골수 억제의 예측인자
이정석(Jung Suk Lee),이혜윤(Hye Yoon Lee),성낙송(Nak Song Sung),전기원(Ki Won Cheon),문주익(Ju Ik Moon),이상억(Sang Eok Lee),최인석(In Seok Choi),최원준(Won Jun Choi),윤대성(Dae Sung Yoon) 대한종양외과학회 2016 Korean Journal of Clinical Oncology Vol.12 No.1
Purpose: Myelosuppression, particularly neutropenia, is one of the most frequent and serious toxicity seen in patients with breast cancer undergoing systemic chemotherapy. However, the predictive factors for development of severe neutropenia in chemotherapy remain unknown. We therefore evaluated predictive factors for excessive myelosuppression. Methods: We retrospectively analyzed 341 patients with breast cancer treated with chemotherapy from 2000 to 2012. Clinicopathological characteristics, number of using of granulocyte colony-stimulating factor (G-CSF), and pretreatment hematologic values were extracted from the electronic medical record system. Patients were sorted 2 groups by number of using G-CSF in each chemotherapeutic regimens; group 1 is more G-CSF (within high 20 percentile) and 2 less G-CSF using group (within lower 20 percentile). Results: Number of using G-CSF was ranged 0–83 (mean 10.76). One hundred one patients were in group 1 and 65 patients were in group 2. Mean of number of G-CSF using was 0.21 in group 1 and 28.02 in group 2. Pretreatment white blood cell, hemoglobin and platelet count were lower in group 2 than in group 1 (6.88×103/μL vs. 5.97×103/μL, 12.63 g/dL vs. 11.90 g/dL, and 275.95×104 μL vs. 227.37×104 μL). There were no statistically differences in other clinicopathologic characteristics such as age, body mass index or comorbidities, hormonal receptor, stage, and other pretreatment hematologic values. Conclusion: Pretreatment white blood cell count, hemoglobin and platelet count can be used to identify patients at increased risk of significant myelosuppression undergoing chemotherapy with breast cancer. This information can be used to target high-risk patients for prophylactic treatment.
근골격계질환 관련 유해요인조사자의 직무교육에 관한 연구
최인석(In Seok Choi),정병용(Byung Yong Jeong) 대한인간공학회 2008 大韓人間工學會誌 Vol.27 No.4
This study conducted two surveys to establish an educational system to prevent work-related musculoskeletal disorders. The first survey investigates the factors influencing the recognition of job specifications for risk factor analysts of work-related musculoskeletal disorders. The respondents of the first survey were selected from 173 different small-sized manufacturing enterprises having less than 300 workers and had experienced the inspection of risk factors. The results of the first survey shows that better recognition of job specifications are followed by the increase of education time, but regardless of the positions and periods of job experience. Among the respondents with a high level recognition, the second survey was conducted. According to the results, it is presented that 2, 8, 16 hours are the most suitable for educating workers, superintendents, and risk factors analysts. Based on the results of the second survey, educational contents have also been suggested. This research will provide the basic information when forming education systems to prevent musculoskeletal disorders.