• 융합보안논문지
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• 제18권5_1호
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• pp.93-98
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• 2018

한국수력원자력, 한국전력공사, 한국남동발전 등의 발전 제어시스템은 전력을 공급하는 국가의 주요 인프라 시설로 악의적인 해킹 공격이 진행될 경우 그 피해는 상상을 초월한다. 실제로 한국수력원자력은 해킹 공격을 당하여 내부정보가 유출되는 등 사회적인 큰 문제를 야기하였다. 본 연구에서는 최근 이슈가 되고 있는 융합보안 연구에 대해 전력회사 중심의 발전 제어시스템을 대상으로 그 환경을 분석하고, 현황을 분석하여 다양한 발전 제어시스템의 안정화를 위한 전략체계 수립과 대응책을 제시하고자 한다. 다양한 물리적 보안시스템(시설), IT 보안시스템, 출입통제시스템 등에서 나오는 데이터 형태를 정규화하고 통합하여 융합인증을 통해 전체 시스템을 통제하고, 융합관제를 통해 위험을 탐지하는 방법을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권2호
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• pp.295-311
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• 2023

Cloud computing has evolved significantly, intending to provide users with fast, dependable, and low-cost services. With its development, malicious users have become increasingly capable of attacking both its internal and external security. To ensure the security of cloud services, encryption, authorization, firewalls, and intrusion detection systems have been employed. However, these single monitoring agents, are complex, time-consuming, and they do not detect ransomware and zero-day vulnerabilities on their own. An innovative Record and Replay-based hybrid Honeynet (R2NET) system has been developed to address this issue. Combining honeynet with Record and Replay (RR) technology, the system allows fine-grained analysis by delaying time-consuming analysis to the replay step. In addition, a machine learning algorithm is utilized to cluster the logs of attackers and store them in a database. So, the accessing time for analyzing the attack may be reduced which in turn increases the efficiency of the proposed framework. The R2NET framework is compared with existing methods such as EEHH net, HoneyDoc, Honeynet system, and AHDS. The proposed system achieves 7.60%, 9.78%%, 18.47%, and 31.52% more accuracy than EEHH net, HoneyDoc, Honeynet system, and AHDS methods.

• 동의생리병리학회지
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• 제21권1호
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• pp.291-297
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• 2007

Although Traditional Korean Medicine had always referred to Mamok(痲木: Paresthesia) as the prodrome of stroke for a long time, yet there were only few research papers on it. Hence, the purpose of this research is to explore the relationship between Mamok(痲木; Paresthesia) as the prodrome and an attack of stroke. Setting 509 Korean impatient women as the subject of research, 264 of the whole are stroke patients and 245 are non-stroke patients. Blood tests, questionnaires, and body measurements (height, weight, waist, hip) are performed to the subjects. Basic population traits, life-style, and past history are included in the contents of questionnaires. whether or not they have experience the numbness, description about the clinical characteristics of the symptom, the body parts which the symptom occurred, the onset of the symptom, and the incidences are examined in the category inquiring the numbness of the hand and foot. After adjusting for age, unilateral numbness was associated with significantly increased risk of stroke. When adjusted for other factors(Half of WHR, History of Hypertension and Diabetes mellitus, Cigarette smoking, Alcohol drinking, Education, Marital status, Regular exercise), the risk of stroke was positively associated with unilateral numbness.(Age Adjusted Odds Ratios=2.282(95%CI=1.107-4.705), Multivariate Odds Ratios=4.105(95% CI=1.233-13.671)) Whereas no significant association was observed in the onset and the incidence of unilateral numbness. This study suggest that preceding Mamok(痲木; paresthesia) before stroke attack is may be common prodrome symptoms of stroke. Prospective cohort study on the association between Mamok(痲木;Paresthesia) as the prodrome and an attack of stroke in Korean population will be necessary.

• 한국멀티미디어학회논문지
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• 제14권10호
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• pp.1303-1310
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• 2011

본 논문은 인프라 클라우딩 환경에서 데이터를 소유한 소유자 노드와 데이터를 보관하는 보관 노드 그리고 데이터를 검증하는 검증 노드로 구성된 자가 조직 저장 매체 보안을 위한 3자간 협상 프로토콜을 설계를 제안한다. 제안한 자가 조직 저장 매체의 보안기법은 보관 노드의 데이터 검증을 검증 노드에게 위임함으로써 데이터 검증의 효율성을 증가시키고, EC-DH 알고리즘을 이용하여 생성된 암호키와 저장 매체 내의 인증서로 보안을 강화시켰다. 또한, 자가 조직 저장 매체를 구성할 때, 3자간 인증키를 설정하여 외부적인 플러딩 공격 방지하고, 검증노드의 개수를 제한함으로써 내부적인 플러딩 공격을 방지하였다. 그리고 검증단계에서 발생할 수 있는 재전송 공격은 검증을 요청할 때마다 새롭게 생성된 Seed 값을 이용하여 자동적으로 재전송 공격을 탐지하도록 하였다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.325-333
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• 2001

The present study investigates convective heat/mass transfer and flow characteristics inside the cooling passage of the gas-turbine blades. It is important to increase not only the heat transfer rates but also the uniformity of heat transfer in the cooling passage. The square duct has compound-angled ribs with $60^{\circ},\;70^{\circ}$ and $90^{\circ}$ attack angles, which are installed on the test plate surfaces. a naphthalene sublimation technique is employed to determine the detailed local heat transfer coefficients using the heat and mass transfer analogy. The ribs disturb the main flow resulting in the recirculation and secondary flows near the ribbed wall and the vertices near the side-wall. The local heat transfer and the secondary flow in the duct are changed largely according to the rib orientation. Therefore, geometry and arrangement of the ribs are important fur the advantageous cooling performance. The angled ribs increase the heat transfer discrepancy between the wall and center regions because of the interaction of the secondary flows. The average heat/mass transfer coefficient and pressure drop of the ribs with the $60^{\circ}$ $-90^{\circ}$ compound-angle are higher than those with the $60^{\circ}$ attack angle. Also, the thermal efficiency of the compound-angled rib is higher than that with the $60^{\circ}$ attack angle. The uniformity of heat/mass transfer coefficient on the cross ribs may is higher than that on the parallel ribs array.

• Advances in concrete construction
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• 제5권2호
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• pp.117-143
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• 2017

The attack of environmental aggressive agents progressively reduces the structural reliability of buildings and infrastructures and, in the worst exposition conditions, may even lead to their collapse in the long period. A change in the material and sectional characteristics of a structural element, due to the environmental damaging effects, changes its mechanical behaviour and varies both the internal stress redistribution and the kinematics through which it reaches its ultimate state. To identify such a behaviour, the evolution of both the damaging process and its mechanical consequences have to be taken into account. This paper presents a computational approach for the analysis of reinforced and prestressed concrete elements under sustained loading conditions and subjected to given damaging scenarios. The effects of the diffusion of aggressive agents, of the onset and development of the corrosion state in the reinforcement and the corresponding mechanical response are studied. As known, the corrosion on the reinforcing bars influences the damaging rate in the cracking pattern evolution; hence, the damage development and the mechanical behaviours are considered as coupled phenomena. The reliability of such an approach is validated in modelling the diffusion of the aggressive agents and the changes in the mechanical response of simple structural elements whose experimental behaviour is reported in Literature. A second set of analyses studies the effects of the corrosion of the tendons of a P.C. beam and explores potentially unexpected structural responses caused by corrosion under different aggressive exposition. The role of the different types and of the different positions of the damaging agents is discussed. In particular, it is shown how the collapse mode of the beam may switch from flexural to shear type, in case corrosion is caused by a localized chloride attack in the shear span.

• 대한한방소아과학회지
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• 제21권3호
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• pp.189-203
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• 2007

Objectives The prognosis, recurrence rate and treatment of febrile seizure were studied through the research of recent western medicine and Chinese oriental medicine paper. Methods Recent western medicine paper of internal and external and chinese oriental medicine paper from 1999 to 2007 were investigated. Results and Conclusions The prognosis of febrile seizure was good in most cases, but children with febrile seizure who developed epilepsy range between 2 and 10%. The risk factors developed epilepsy including complex febrile seizure, focal and prolonged seizure, pre-existing neurodevelopmental abnormalities and recurrent febrile seizure. Recurrence rate of febrile seizure ranges between 30 and 50% was high. The risk factors can be predicted by their age at first febrile seizure happened, family medical history of febrile seizure and epilepsy, complex febrile seizure, and neurodevelopmental abnormalities. However, the most important factor of those is the age when they have first febrile seizure. Diazepam or Lorazepam was administrated for a child with prolonged seizure but only Diazepam was used for reducing recurrence of febrile seizurein febrile illness. However, there were some side effects such as lethargy, ataxia, and irritability. The study of chinese oriental medicine demonstrates that the acupuncture and venesection were used for seizure attack and reduced of recurrences and second attack. To reduce recurrence of febrile seizure, herbal medicine was also used for febrile illness or after seizure attack within a certain period of time, so reduce the recurrence, frequency of seizure and febrile illness. The most of herbs in prescription were used for removing heat and toxic meterials(淸熱解毒), extinguishing wind and to stopping the convulsion(熄風止痙)

• 산업융합연구
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• 제16권2호
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• pp.25-31
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• 2018

APT공격은 특정 목표를 두고, 지속적으로 공격하는 신종 해킹기법으로 해커가 다양한 보안위협을 악용해 특정 기업이나 조직의 네트워크에 지속해서 공격하는 것을 APT 공격이라고 한다. 특정 조직 내부 직원의 PC를 장악한 후, 내부 서버나 데이터베이스에 접근하여 개인정보 유출 사고나 중요자료 유출과 같이 기업이나 기관 내 중요 자산 탈취에 성공할 때까지 공격하는 것이 특징이다. 또한, APT 공격은 한순간에 공격이 이루어지지 않고 있으며, 수년에 거쳐 이루어지므로 해킹 감지가 어렵다. 본 논문에서는 지속적인 APT 공격에 대해 고찰하고, 대응방안을 제시하여 각 조직에 근무하는 경영진부터 일반 직원까지 보안 필요성을 인식하고 교육하고 보안 관리체계를 구축을 목표로 한다. 또한, 보안 업데이트, 최신 백신을 설치하여 악성코드 침투를 예방하는 방법을 제시하여 기업이나 조직은 항상 해킹당할 수 있다는 인식을 심어주어 조직 내에 근무하는 사람들은 악성 코드가 침투할 수 있는 취약점을 설명하고, APT공격에 대응할 수 있는 환경을 제시한다.

• 대한한방내과학회지
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• 제29권1호
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• pp.149-159
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• 2008

Background and Purpose : This study was to assess characteristics in acute stroke patients according to obesity and abdominal obesity. Methods : From1 Oct. 2005 to 31 Jul. 2007, 629 patients with a stroke were included. Patients were hospitalized within 30 days after the onset of stroke at Kyungwon University Incheon Oriental Hospital, DongGuk University International Hospital and Department of Cardiovascular and Neurologic Disease (Stroke Center), or Kyung Hee University Oriental Hospital. We investigated general characteristics preferences according to general obesity and abdominal obesity. Results : 629 acute stroke patients were included in the final analysis. Male, young age, hypertension, heart disease in the family history, hypertension in the past history, care of invalids or grandchildren and Taeumin in the Sasang constitution were higher among obese patients. Male, transient ischemic attack in the past history, smoker and Soyangin in the Sasangconstitution were higher among patients with abdominal obesity. The incidence of abdominal obesity corresponded to lower education level. Conclusions : In our study, we observed the general disposition of various characteristic distributions according to obesity and abdominal obesity in acute stroke patients.

• Journal of Yeungnam Medical Science
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• 제7권1호
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• pp.61-68
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• 1990

급성 심근경색증 회복 초기의 심실기외수축은 좌심실의 기능, 연령, 흡연, 당뇨병, 협심중의 기왕력, 심근 경색증의 기왕력과 무관하게 발생하며 ST-T절의 변화는 심실기외수축이 있는 경우에 다발하였다. 수면기에는 각성기에 비하여 심실 부정맥이 유의하게 감소하였다.