근거리 무선 통신의 안전한 보안 모니터링 기법

서대희,이임영,Seo, Dae-Hee,Lee, Im-Yeong 한국정보처리학회 2003 정보처리학회논문지 C : 정보통신,정보보안 Vol.10 No.3

In accordance with the changes in the wireless communication environment, there has been a great need to satisfy the demand for diverse modes of information exchange. Various types of short-distance wireless communication technology have been developed and studied to meet this demand. Among them, Bluetooth and WLAN which has recently been acclaimed as the standard for short-distance wireless communication, has been the focus of many such studies. However, Bluetooth and WLAN has weaknesses in its security features when its in real services are applied to m-commerce. The purpose of this study is to propose techniques that affinity considers to item that is non-security enemy who is although there is no public secure division direct connection in peculiar environment of radio environment as well as limitation security enemy of short distance radio communication. Propose secure monitoring techniques for straggling device to user center also applying proposed way to Bluetooth and WLAN that are short distance communication representative technology based on item that is security enemy and item that is rain suity enemy. 무선 정보 환경의 변화에 따라 다양한 정보에 대한 풍족감이 요구되고 이에 따라 많은 근거리 무선 통신 기술들이 연구 개발되어 왔으며, 그 중에서도 최근 근거리 무선 통신의 표준으로 각광받고 있는 블루투스와 무선랜은 많은 관심을 받고 있다. 그러나 근거리 무선 통신을 실제 무선 환경에 적용하기엔 많은 문제점들이 제기되고 있다. 따라서 본 논문에서는 현재 근거리 무선 통신의 보안적 취약점 뿐만 아니라 무선 환경이라는 특수한 환경에서 보안적 사항과 사용자의 프라이버시와 밀접한 관계가 있는 비보안적인 사항까지 고려한 일반화된 중앙 집중형 보안 모니터링 기법을 제안한다. 또한 제안된 방식을 근거리 무선 통신의 대표적인 기술인 블루투스와 무선랜에 적용시켜 사용자 중심으로 흩어져 있는 모바일 디바이스에 대한 안전한 보안 모니터링 기법을 제안한다.

비파열뇌동맥류 진료지침 - 종설 -

서대희,강현승,김대원,박석규,송영,신승훈,유승훈,권순억,나정호,배희준,오창완,유경호,윤병우,이병철,허지회,홍근식,홍승철,박인성 대한뇌혈관외과학회 2011 Journal of Cerebrovascular and Endovascular Neuros Vol.13 No.4

Intracranial aneurysmal rupture causes subarachnoid hemorrhage which usually leads to fatality or severe disability. Treatment of unruptured intracranial aneurysms (UIAs) can substantially reduce the risk of rupture and prevent the grave consequences, but the risk of prophylactic treatment cannot be ignored. UIAs have diverse characteristics and management strategy needs to be tailored according to their location, size and clinical status. In the absence of level I evidence, the treatment guidance often relied on expert’s opinions and experience. Knowledge of the natural course and management risks of individual aneurysms can help to guide treatment decision, but the natural history is still controversial and risks are not clearly defined. The Korean Society of Cerebrovascular Surgeons (KSCVS) decided to issue a Korean version of UIA management guideline as a framework for the treatment decision and as a basis for future studies, following ‘Guideline Development Manual’ of the Clinical Research Center for Stroke (CRCS). The organized committee systematically reviewed relevant literature and major guidelines published between January 2000 and July 2010 and took a developmental strategy of adaptation rather than de novo methods. On the basis of interpretation of the published evidences, recommendations were synthesized, and the level of evidence and the grade of recommendation were determined using the methods adapted from those of the US Agency for Healthcare Policy and Research and CRCS. The current guideline focuses on three domains of natural history, diagnosis and treatment of UIAs. The hierarchy of evidence and the recommendation grading indicate the current level by the literature and do not indicate the necessity or the prohibition of a certain clinical practice. Accordingly, this guideline cannot provide the answer for every clinical situation and should not take precedence over the clinical judgment of responsible physicians for individual patients. The final judgment regarding the care of a particular patient must be made by the physician and patient in light of circumstances specific to that patient. This is the first version of the UIA management guideline in Korea and new evidences will be timely and continuously updated in the future guidelines.

수술, 방사선수술, 색전술을 이용한 뇌동정맥기형의 치료:임상경험 74례

서대희,홍승철,남도현,이정일,김종수,신형진,박관,어환,김대용,변홍식,김종현 대한신경외과학회 2002 Journal of Korean neurosurgical society Vol.31 No.4

Objective:With the greater availability of alternative techniques, different management strategies are evolving for the treatment of arteriovenous malformations(AVM's) and individual management decision became more complex. The purpose of this study is to report our experiences in treatment of AVM's. Methods:We retrospectively studied the result of 74 patients with cerebral AVM's treated in 1995-1999 at our hospital. Results:Of the 74 patients, 38 patients had hemorrhage as presenting symptom. Surgery was done in 47 patients. Preoperative embolization was performed in 28 patients. In 44 of these patients(93.6%), the lesions were totally removed. Postoperative radiosurgery was done in two cases with partial removal. Radiosurgery was used as a primary treatment modality in 19 patients, in four of them preradiosurgical embolization was performed. In 15 patients who were followed over 12 months, complete obliteration of the nidus was confirmed in four cases(27.6%) and partial obliteration in six cases. Embolization was performed in eight patients as a primary treatment with complete obliteration verified in only one case. There were seven fatal cases. Conclusion:We conclude that microsurgical resection is the most effective treatment and surgical indication can be extended by embolization and functional evaluations. Radiosurgery may be a useful treatment modality for small, deep-seated, or inoperable lesions. Embolization facilitates surgery and radiosurgery, but should be used very carefully because of high complication rate. Key words:Arteriovenous malformation;Surgery;Embolization;Radiosurgery;Functional evaluation.

누액선에 발생한 Adenoid Cytic Carcinoma - 증 례 보 고 -

서대희,백정환,김윤덕,하범준,박익성,남도현,박관,김종현,Seo, Dae Hee,Baek, Chung-Hwan,Kim, Yoon-Duck,Ha, Bom Joon,Park, Ik-Seong,Nam, Do-Hyun,Park, Kwan,Kim, Jong-Hyun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8

Adenoid cystic carcinoma(ACC) is a rare malignant tumor that occurs in exocrine glands such as major and minor salivary glands, lacrimal glands, ceruminal glands. It has a tendency for delayed distant metastasis and long clinical course. ACC of the lacrimal gland is generally found in adults and is usually managed by radical orbitectomy and supplemental external beam irradiation. The authors present two cases of recurrent lacrimal gland ACC with review of the literature.

멀티 에이전트를 이용한 Single Sign-On 인증 모델에 관한 연구

서대희,이임영 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.7

Musician을 위한 디지털 콘텐츠의 선택적 추출 및 안전한 관리 기술

서대희,오승희,김주영,백장미 보안공학연구지원센터 2013 보안공학연구논문지 Vol.10 No.5

논문에서는 디지털 콘텐츠에서 특정 채널을 추출하고 해당 특정 채널을 대신해 사용자가 생성 한 채널을 삽입하여 새로운 디지털 콘텐츠를 생성하는 방식을 제안하고자 한다. 특히, 디지털 콘텐츠 에 대해 정당한 사용자임을 인증하고 새로운 콘텐츠에 대한 생성에서 폐기까지의 권한을 획득하기 위한 보안 방식을 제시하고자 한다.

RFID 시스템의 서비스 가용성 제공에 관한 연구

서대희,이임영 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2

Spotlighted as an innovative information technology environment, ubiquitous computing has been actively researched on recently. Especially, domestic and global researchesfocus on the RFID system, which is being eyed to replace the existing bar-code system. As an essential technology for ubiquitous computing, the RFID system can be applied for various purposes. The security issues of The Auto-ID Center in the U.S. is spearheading the research on distribution service and omni-directional security. As for Japan, the researches on omni-directional security and EPC application are necessary in securing the technology for ubiquitous computing with support form the Ministry of Public Management Home Affairs, Posts, and Telecommunication. In this paper, a method of ensuring the availability of the RFID system service will be presented based on the ubiquitous computing environment with the existing omni-directional security and user-friendly interface. While the existing researches focus on the RF reader system and tag-based security, this paper's suggestion also considers the availability of a service to suggest ways of increasing the practical usage of a low-priced RF tag.

유비쿼터스 환경을 위한 다중 사용자 기반의 안전하고 효율적인 무선 네트워크 관리 기법 제안

서대희,이임영,Seo Dae-Hee,Lee Im-Yeong 한국정보처리학회 2006 정보처리학회논문지 C : 정보통신,정보보안 Vol.13 No.1

최근 새로운 형태의 네트워크 환경인 유비쿼터스 컴퓨팅에 대한 연구가 활발하게 진행되고 있다. 특히 유비쿼터스 컴퓨팅에서 중요한 요소는 센서 네트워크로써, 저전력 Ad-hoc 네트워크에 기반한 센서와 센서 노드들로 구성되며, 실제의 환경과 유비쿼터스 컴퓨팅과의 매개 역할을 한다. 현재의 유비쿼터스와 관련된 연구는 주로 RFID를 이용해 경량화된 하드웨어를 통한 네트워크 관리에 대한 연구가 진행중에 있다. 그러나 실생활에 적용하기 위해서는 보다 현실적인 시나리오와 더불어 안전성과 효율성을 고루 갖춘 보안적인 연구가 필수적으로 요구되고 있다. 따라서 본 논문에서는 현재 연구가 진행중인 RFID 이외에 개인 네트워크에서 가장 많은 활용성을 제공하고 있는 PTD를 기반으로 다중 사용자들의 무선 네트워크 구성하고 이를 관리하는 방식을 제안하고자 한다. 제안된 방식은 사용자 주변의 신뢰된 기기를 기반으로 무선 네트워크에서 요구되는 다양한 서비스와 관련된 보안과 효율성을 높이기 위한 방식으로 기존 논문에서 전자 상거래에 사용하던 PTD를 이용해 다양한 서비스를 제공하고 임시 그룹을 설정하여 동적인 환경에 적합한 관리방식을 제안하였다. Ubiquitous computing, a new type of network environment has been generating much interest recently and has been actively studied. In ubiquitous computing, the sensor network which consists of low electric power ad-hoc network-based sensors and sensor nodes, is particularly the most important factor The sensor network serves as the mediator between ubiquitous computing and the actual environment. Related studies are focused on network . management through lightweight hardware using RFID. However, to apply these to actual environment, more practical scenarios as well as more secured studies equipped with secures and efficiency features are needed. Therefore, this study aims to build a wireless network based on PTD for multi users, which provides the largest utility in individual networks, and propose an appropriate management method. The proposed method is designed to enhance security and efficiency related to various services required in wireless networks, based on the reliable peripheral devices for users or pm. using pm, which has been applied to electronic commerce transactions in existing papers, this study also proposed an appropriate management method that is suitable for a dynamic environment and setting a temporary group to provide various services.

ESCORT:Secure P2P Protocol for Global Cooperation in Overlay Network Services

서대희,안개일,김종현,백장미,조동섭 보안공학연구지원센터 2011 보안공학연구논문지 Vol.8 No.6

This paper aims to analyze vulnerability of overlay networks for the existing P2P service and suggest a secure and efficient ESCORT network. Encryption functions are used to provide encryption, explicit mutual authentication and session keys are provided to ensure secure communication, and a middle object is suggested to maintain efficiency. Moreover, Time stamps are used for each communication process to provide effective network security service. Thus, the proposed ESCORT network provides not only security for P2P users but also other advantages such as user privacy protection, secure communication and effective security management through centralized control.

안전한 유·무선 FMC 시스템을 운영하기 위한 보안 시스템 개발

서대희,백장미,강병모,이병길,홍인식 보안공학연구지원센터 2012 보안공학연구논문지 Vol.9 No.3

최근 데이터 서비스의 증가와 함께 통신 서비스 환경도 단순히 빠르게 정보를 전달하는 것에서 지식, 감성, 재미, 편리성, 경험 등 다양한 고객의 가치를 전달하는 것으로 변화하고 있다. 이러한 고객 의 요구를 만족시키기 위해 네트워크는 점차 지능화되고 통합되고 있다. 이러한 통신 환경의 변화에 따라 FMC(Fixed Mobile Convergence) 서비스가 등장하였다. FMC 서비스는 포화된 통신 시장 상황 과 수익성 감소를 타개하기 위한 방안으로 집 또는 직장 등 옥내에서도 모바일 서비스를 저렴하고 편리하게 이용하려는 고객의 니즈를 수용하는 수요자 중심의 서비스이다. 미국, 영국 등 선진국에서 는 보안에 경미한 업무를 중심으로 유·무선 통합 서비스를 도입하고 있으며, 국내에서도 대기업과 공 공부문에서 시작으로 중소기업까지 확산되고 있다. 이에 따라, FMC 서비스에 대한 보안위협이 증가 되고 있으며, 스마트폰 운영체계, 서비스 특성, 보관하고 있는 정보 등 단말 자체가 스마트해짐을 고 려할 때 보안 사고로 인한 피해의 규모는 기존 유선에 대한 보안 사고보다 더욱 심각해 질 것으로 예상된다. 따라서 본 논문에서는 국내 실정에 적합한 국내 표준 암호알고리즘(ARIA, SEED)을 적용한 SSL VPN 시스템을 개발하고, 여기에 웹 가속기 기술을 접목한 가속기 통합형 SSL VPN 게이트웨이 장비를 소개하고자 한다.