• 대한한의학원전학회지
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• 제22권4호
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• pp.39-42
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• 2009

Jeongji(情志) in Chinese medicine refers to a series of psychological activity which is expressed as hui(喜), no(怒), wu(優), sa(思), bi(悲), gong(恐), gyeong(驚), together with emotion, sentiment, and cognition, which are manifested as responses of the human body to environmental changes both inside and outside. Sa(思) is a major cognitive activity, and the other six emotions are main emotional activities. The emphasis on the interrelationship between cognition, sentiment, and emotional activity is a unique characteristic of the Jeongji(情志) concept in China. Jeongji[Mental] disorder refers to a series of diseases that has a close link between the attack, clinical presentation and emotional stimulation. The attack is deeply affected by emotional stimulation, with which physical symptoms are either present or absent. However, emotional changes are clear most of the time, their effect on disease development noticeable as well. To sum up, Jeongji[Mental] disorder is related to a wide range of medical problems in fields such as internal, surgical, gynecology, pediatrics, and various psychiatric disorders, not to mention contemporary psychological disorders, neurosis, and all kinds of mental illnesses of today. Moreover, the mental and physical disorders of today all share a common pathogenesis, clinical manifestation and treatment discipline. All the more reason for deeper professional research.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2010년도 춘계 학술논문 발표대회 1부
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• pp.77-81
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• 2010

This study deals with the analysis of color-difference and physical property of anti-corrosion coatings using at inside of concrete tank for drinking water. Because anti-corrosion coatings are effected by chemical attack, color and physical property are changed. So in this study when epoxy resin coatings of 3 types were received chemical attack by Cl- and NaOH, we present the co-relationship between color-difference and bond strength. For this study, we used the colorimetry, which can measure the degree of color difference on surface of materials. As the results, in case of Cl-, color change is appeared, bond strength also is decreased. From this experiment, we could know that color change due to chemical aging has the deep relationship with physical performance(bond strength) materials. further researches are needed.

• 융합보안논문지
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• 제11권6호
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• pp.3-8
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• 2011

최초 사회공학기법의 발달로 해킹, 악성코드가 고도화, 첨단화 되어 기업에 대한 표적 공격인 APT(Advanced Persist ent Threat)공격이 급격히 증가하고 있다. APT공격의 가장 큰 특징 중 하나는 지속성이다. 공격자는 내외부에서 지속적으로 공격대상의 정보를 수집 및 활용한다. 보안관제 시스템(Enterprise Security Management)의 경우 이러한 지속적인 공격에 대하여 정상적인 접근 실패로 오인 공격을 받고 있음에도 별도의 경고를 할 수 없는 한계점이 있다. 이러한 오탐 데이터를 철저히 분석하기 위한 시스템 설계 및 연구가 필요하다. 본 논문에서는 데이터마이닝을 이용하여 지나칠 수 있는 오탐을 임계치 기준 분류하여, 산출된 비교 값을 기준으로 지속적으로 일어나는 공격에 대한 예측 및 공격에 대한 개선된 대응 방안을 제시한다. 제안 기법을 사용하여 장기적으로 시도되는 공격 데이터를 분류, 앞으로 일어날 수 있는 공격 징후 탐지가 가능하다.

• 융합보안논문지
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• 제14권7호
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• pp.17-22
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• 2014

MANET은 빠르게 네트워크를 구축할 수 있다는 특징 때문에 많은 분야에서 활용되고 있다. 그러나 무선 네트워크의 특성과 노드들의 이동으로 인해 많은 보안 위협에 노출되어 있다. 특히 그중에서도 라우팅 프로토콜의 취약점을 이용한 공격이 증가하고 있으며 그 피해 또한 매우 증가하고 있는 설정이다. 본 논문에서는 안전한 라우팅 프로토콜 제공을 위한 two-level 인증 구조를 제안하였다. 제안한 기법에서는 네트워크에 참여하는 노드들에 대하여 신뢰도를 기반으로 한 인증 평가를 실시하여 인증서를 발급해주며, 인증서를 발급받은 노드만이 데이터 전송을 수행하게 된다. 그리고 인증서를 발급받은 노드가 데이터 전송시 제어 패킷의 정보와 자신이 관리하는 PIT 정보를 비교 및 분석하여 악의적인 노드들에 대한 탐지를 수행하게 된다. Ns-2 시뮬레이터를 이용하여 본 논문에서 제안한 기법의 성능을 평가하였으며, 실험을 통하여 우수한 성능을 확인하였다.

• 대한기계학회논문집B
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• 제26권11호
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• pp.1542-1551
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• 2002

The present study investigates the convective heat/mass transfer characteristics and pressure drop inside the rib-roughened cooling passage of gas turbine blades. The internal cooling passage is simulated using a square duct with h- and V-shaped rectangular ribs which have a 60。attack angle. A naphthalene sublimation technique is employed to determine the detailed local heat/mass 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 wail. The secondary flow patterns and the local heat transfer in the duct are changed significantly according to the rib orientation. A square duct with ∧ - and V-shaped ribs have two pairs of secondary flow due to the rib arrangement. Therefore, the average heat/mass transfer coefficients and pressure drop of ∧ - and V-shaped ribs are higher than those of the continuous ribs with 90$^{\circ}$ and 60$^{\circ}$attack angles. The ∧-shaped ribs have higher heat/mass transfer coefficients than the V-shaped ribs, and the uniformity of heat/mass transfer coefficient are increased with the discrete ribs due to the flow leakage and acceleration near the surface.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집B
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• pp.280-287
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• 2001

The present study investigates convective heat/mass transfer and flow characteristics inside the rib-roughened cooling passage of the gas turbine blades. A square duct with rectangular ribs is used and $\wedge-$ and V-shape ribs with $60^{\circ}$ attack angle are installed on the test plate surfaces. 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 vortices near the side-wall. The local heat transfer and the secondary flow in the duct are changed largely according to the rib orientation. A square duct with $\wedge$ and V-shape ribs has two pairs of secondary flow because of the rib arrangement. So, the duct has complex heat/mass transfer distribution. The average heat/mass transfer coefficient and pressure drop of $\wedge-$ and V-shape ribs are higher than those with $90^{\circ}$ and $60^{\circ}$ attack angles. The average heat/mass transfer coefficient on the $\wedge-shape$ ribs is higher than that on the V-shape ribs. Also, the uniformity of heat/mass transfer coefficient on discrete ribs is higher than that on continuous rib.

• 한국통신학회논문지
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• 제36권1B호
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• pp.43-50
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• 2011

최근 공격기술은 네트워크의 진화와 함께 다양한 형태로 나타나고 있으며, 대부분의 네트워크에서는 다양한 보안장치들을 통해 대응하고 있다. 또한 외부 공격으로부터 내부 네트워크의 정보자산을 보호하지 위해 기존 네트워크에 필요한 보안시스템들을 추가 배치하고 있다. 그러나 이와 같은 네트워크 구축방법 및 보안시스템의 사용은 내부 네트워크의 성능과 보안에 큰 영향을 미친다. 따라서 본 논문은 내부 네트워크의 보안시스템 사용 및 구축에 따른 성능저하요인을 분석함으로써, 향후 내부 네트워크의 성능 및 보안성 향상을 위한 자료로 활용될 것으로 기대한다.

• 디지털산업정보학회논문지
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• 제11권4호
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• pp.61-68
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• 2015

MANET has various vulnerability in wireless network and is more vulnerable in security because central management is not performed. In particular, routing attack may decrease performance of the overall network because the mobile node acts as a router. In this paper, we proposed authentication technique for improving the reliability of the network by increasing the integrity of the routing control packet and blocking effectively attacks that occur frequently in the inside. The proposed technique is consisted of two authentication methods of ZCN and N2N. ZCN authentication method is to elect CA nodes and monitor the role of the CA nodes. N2N authentication method is for an integrity check on the routing packets between nodes. Index key is determined by combining the hop count value to shared key table issued from CA in order to increase the robustness of the internal attack. Also, the overhead of key distribution was reduced by distributing a shared key to nodes certificated from CA. The excellent performance of the proposed method was confirmed through the comparison experiments.

• 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.

• 정보보호학회논문지
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• 제32권2호
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• pp.227-242
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• 2022

안드로이드 OS의 패턴 스크린 잠금 기능은 가장 일반적으로 사용되는 사용자 인증 기법이다. 현재 사용되는 패턴 스크린 잠금 기법은 패턴의 종류에 따라 약 39만개의 조합이 가능하며, 잘못된 입력 시 입력 지연 등의 기법이 적용되어 무작위 대입 공격으로는 쉽게 공격하기 어렵다. 이 논문에서는 ARM 기반의 멀티코어 시스템에서 사용하는 하드웨어의 구성 요소 중 캐시 일관성 인터페이스가 패턴의 종류를 파악할 수 있는 부채널이 될 수 있음을 보인다. 이러한 하드웨어 부채널을 이용하여 스크린 잠금 패턴의 꺾임 횟수와 전체 길이를 유추할 수 있으며, 이를 통해 공격의 효율성이 매우 높아질 수 있음을 제시한다.