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엑티브 네트워크 기반의 고속 이동시 차량 간 통신 프로토콜
장혜숙,이진관,정규철,이종찬,박기홍 한국융합보안학회 2008 융합보안 논문지 Vol.8 No.1
무선 센서 네트워크에서 공격자는 한 위치에서 패킷을 획득하여 획득한 패킷을 재전송하는 공모 모드에게 터널하는 웜홀 공격을 가할 수 있다. 공격자는 이웃 발견 단계 동안에 웜홀 공격을 가할 수도 있으므로, 웜홀 공격은 라우팅 프로토콜에게 매우 위험하다. 웜홀의 전략적인 배치는 네트워크를 통한 통신에서의 심각한 붕괴를 가져올 수 있다. 본 논문은 센서 네트워크를 위한 훼손 감내하는 터널된 패킷 여과 기법을 소개한다. 제안 기법은 메시지의 홉 수와 메시지에 덧붙여진 암호화된 홉 수와의 비교를 통하여 홉 수가 조작된 메시지를 탐지할 수 있다. 제안 기법은 각 노드에 할당된 보안 정보의 양을 제안함으로써 훼손된 노드를 사용하는 웜홀 공격의 영향을 줄일 수 있다. In wireless sensor networks, an adversary can launch the wormhole attacks, a malicious node captures packets at one location and tunnels them to a colluding node, which retransmits them locally. The wormhole attacks are very dangerous against routing protocols since she might launch these attacks during neighbor discovery phase. A strategic placement of a wormhole can result in a significant breakdown in comunication acros the network. This paper presents a compromise-resilient tunneled packet filtering method for sensor networks. The proposed method can detect a tunneled message with hop count alteration by a comparison between the hop count of the message and one of the encrypted hop counts attached in the message. Since the proposed method limits the amount of security information assigned to each node, the impact of wormhole attacks using compromised nodes can be reduced.
장혜숙,이상오,홍원선,민영일,정훈용,이영수,김해련,양석균,정성애,송병철,-- 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.6
Pyoderma gangrenosum is a painful, chronic, ulcerating skin disease of unknown cause. It commences as an erythematous papulopustule and rapidly evolves to form an area of frank ulceration with undermined, violaceous edges and a bright outer halo of erythema. Diagnosis is clinical, there being no accepted histological diagnostic criteria. An underlying systemic illness is present in more than 50 percent of patients. Pyoderma gangrenosum develops in 0.8-5.0 percent of patients with inflammatory bowel disease, which is the most frequent underlying disease of pyoderma gangrenosum. There is no report of pyoderma gangrenosum associated with Crohn's disease in Korea. We recently experienced two cases of pyoderma gangrenosum, a 52-year old man with Crohn's disease and a 30-year old man with ulcerative colitis. The cases are presented with the review of literature.
사지 연부조직 혈관종의 초음파 소견: MR 신호강도와의 상관성
장혜숙 대한영상의학회 1995 대한영상의학회지 Vol.33 No.1
Purpose : To evaluate the US findings of soft tissue hemangiomas in extremities and to correlate theecho-pattern with MR signal characteristics of hemangiomas. Materials and Methods : We retrospectively studiedforty-two patients either with pathologically proven cases or with characteristic features of hemangiomas on MRI,US and plain film. Hemangiomas were divided into two types according to the locations; subcutaneous andintramuscular. Analytic points on US and MR findings were gross morphology of the mass, internal echo-pattern orsignal characteristics. We correlated the echo-pattern with MR signal characteristics in hemangiomas. Results :Subcutaneous hemangiomas revealed homogeneously anechoic mass on US, which were well correlated with MR signalcharacteristics; homogeneous low singnal intensity(SI) on T1-weighted image(WI) and high SI on T2-WI.Intramuscular hemangiomas showed heterogeneously mixed echoic masses on US. An anechoic component on UScorresponded to dilated vascular channels on MRI. The signal intensity of intramuscular hemangioma was less thanthat of subcutaneous fat on T1-WI and greater than that of fat on T2-WI. Both types of hemangiomas had tubular orlace-like appearance with interspersed fibrofatty septa. Conclusion : The echo-partterns in US were wellassociated with MR signal characteristics on MRI. Regarding US and MR features, intramuscular hemangiomas weredifferent to subcutaneous hemangiomas.
자기 주도적 학습방식을 위한 스마트폰 콘텐츠 관리시스템 설계 및 구현
장혜숙,이진관,이종찬,박상준,박기홍 (사)디지털산업정보학회 2010 디지털산업정보학회논문지 Vol.6 No.4
Smart phone systems such as Android and iPhone are spreading into the next generation’s computing and the prediction that cell phone (especially smart phone) penetration rate will be higher than that of PC in the near future is predominant. In this paper, we designed and materialized an item pool system which has self directed learning function that enables learning with smart phone (the PC in the hand). Users can choose the way of studying and do the offered estimation depending on their levels with smart phone. It is materialized the studying environment which can be done immediately anytime and anywhere.
대학의 학사업무 가용성 확보를 위한 PC기반 정보시스템 구현에 관한 연구
장혜숙,박기홍,Jang, Hae-Sook,Park, Ki-Hong 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.10
정보화 사회의 발전으로 각 조직체는 정보시스템 의존도가 매우 높아지고 있다. 이에 따라 정보시스템에 장애가 발생하여 신속하게 대응하지 못하면 조직체의 신뢰에 치명적인 결과를 초래하게 된다. 최근에는 정보시스템의 지나친 업무 의존도 때문에 사이버테러의 주요 공격 목표가 되고 있다. 대학의 정보시스템은 기업의 정보시스템 보다 안전성이 더욱 취약하지만, 정보시스템의 가용성 확보를 위한 정책지원이 거의 없는 실정이다. 본 논문은 대학의 학사정보 서비스를 위해 시스템 장애에 대비한 재난 복구의 이론적인 내용을 고찰하고 학사정보 서비스의 가용성이 확보될 수 있는 PC 기반 학사행정 고가용성 정보시스템 구현에 관하여 연구하였다. Most organizations are more depending on information system in advanced information society. According to this current, unrapid reaction to system failure can cause a fatal effect to a credibility of the organization. An excessively high level of dependence on information system at work makes itself as a primary target of cyber terror. The stability of university's information system is especially weaker than the enterprise's but policy support for securing availability is inadequate. In this paper, we consider the recovery system toward to disorder of university's school affairs information system theoretically and suggest high availability PC based academic administration system.