• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.773-775
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• 2011

We analysed privacy, attack model and vulnerability with light-weight RFID System. A specific system's vulnerability depends on its implementation and the applied countermeasures. We can build an RFID system with a satisfactory security level even in a high-risk application area. To do so, however, we must pay attention to the implementation of proportional security measures.

• Journal of Information Processing Systems
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• 제8권3호
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• pp.483-494
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• 2012

Many recent events, such as terrorist attacks, exposed defects in most sophisticated security systems. Therefore, it is necessary to improve security data systems based on the body or behavioral characteristics, often called biometrics. Together with the growing interest in the development of human and computer interface and biometric identification, human face recognition has become an active research area. Face recognition appears to offer several advantages over other biometric methods. Nowadays, Principal Component Analysis (PCA) has been widely adopted for the face recognition algorithm. Yet still, PCA has limitations such as poor discriminatory power and large computational load. This paper proposes a novel algorithm for face recognition using a mid band frequency component of partial information which is used for PCA representation. Because the human face has even symmetry, half of a face is sufficient for face recognition. This partial information saves storage and computation time. In comparison with the traditional use of PCA, the proposed method gives better recognition accuracy and discriminatory power. Furthermore, the proposed method reduces the computational load and storage significantly.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.682-685
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• 2014

In this paper, we presented the window applicable blind-type frequency selective surface to control the coverage area of wireless communication in secure building or conference room. The proposed frequency selective structure has the reconfigurable frequency range depends on its blind rotation angle. To verify the proposed structure, we fabricated the window blind-type frequency selective surface with four-legged loaded element and ring-type element as a unit cell and performed measurements of the transmission characteristics for different blind rotation angles to prove the feasibility. The measurement results show good agreements with the simulation results. One of the advantages is that the proposed structure does not need to have a bias circuit, so it is very easy to implement at low cost and also can be applied to any planar surface for wireless security applications.

• Journal of information and communication convergence engineering
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• 제16권2호
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• pp.93-98
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• 2018

The Internet of Things (IoT) is a form of the emerging 4th industry in the 5G era. IoT is expected to develop naturally in our daily life in the 5G era in which high-speed communication will be completed. Along with the rise of IoT, concerns about security and malicious attacks are also increasing. This paper examines DoS attacks, which are one of the representative security threats of IoT and proposes a local detection and blocking system that are suitable for response to such attacks. First, systems of the LoRaWAN type, which are most actively researched in the IoT system field and DoS attacks that can occur in such systems were examined. Then, the inverse order tree algorithm using regional characteristics was designed as a cluster analysis form. Finally, a system capable of defending denial-of-service attacks in the 5G IoT system using local detection and blocking with the Euclidean distance was designed.

• 한국정보보호학회:학술대회논문집
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• 한국정보보호학회 2003년도 동계학술대회
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• pp.137-140
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• 2003

최근 웜이나 바이러스, DDoS(Distributed Denial of Service)와 같은 네트워크 침해사고가 빈번히 발생되고 있어 이를 해결하기 위한 여러 가지 방안이 연구 중이다. 하지만 대개의 경우 외부의 침입탐지에 대한 대책만이 이루어지고 있어, 실제로 내부 호스트에서 감염되어 발생시키는 트래픽에 대해서는 원인 진단이 어려운 실정이다. 따라서 네트워크 장애의 원인이 되는 단말 호스트를 찾아내어 장애처리를 하는 것이 정상적인 네트워크 환경구축을 위하여 필요하다. 본 논문에서는 네트워크 자원 모니터링과 트래픽 분석을 통하여 이상 트래픽에 대한 징후를 사전에 탐지하고, 최종 단말 호스트의 위치까지 추적 가능한 시스템을 설계 및 구현하고자 한다.

• 한국항해항만학회지
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• 제43권5호
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• pp.302-309
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• 2019

This study introduces the navigational environment database(DB) compiling water depth, sediment type and marine managed areas (MMAs) in coastal waters of South Korea. The water depth and sediment data were constructed by combining their sparse points of electronic navigation chart and survey data with high spatial resolution using the inverse distance weighting and natural neighbor interpolation method included in ArcGIS. The MMAs were integrated based on all shapefiles provided by several government agencies using ArcGIS because the areas should be used in an emergency case of ship. To test the validity of the constructed DB, we conducted a test application for grounding and anchoring zones using a ship accident case. The result revealed each area of possible grounding candidates and anchorages is calculated and displayed properly, excluding obstacle places.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.359-362
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• 2009

공인인증서는 온라인 금융거래와 증권거래 등에서 사용자의 신원 확인을 위해 사용된다. 이때 사용자의 공개키는 공인인증서에 저장되며, 이 공개키에 대응되는 사용자의 개인키는 보안을 위해 사용자가 설정하는 패스워드로 암호화 되어 개인키 저장파일에 저장된다. 본 연구에서는 로컬에서 공인인증서에 접근하는 현재의 방식에 문제점을 지적하고 이를 해결할 수 있는 방법으로 모바일 공인인증서 관리 어플리케이션을 제안한다.

• East Asian Economic Review
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• 제22권4호
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• pp.507-529
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• 2018

This paper evaluates the whole impact of quantitative easing on inflation in Korea implemented by the central banks in four major advanced economies, the U.S., Euro Area, U.K. and Japan. According to the analysis employing a VAR-X model with the security holdings of those central banks an exogenous variable, quantitative easing is estimated to exert downward pressures on inflation in Korea. Considering the impulse responses of Korean macroeconomic variables to a quantitative easing shock, the spillover effect is transmitted through exchange rate channel while trade channel turns out to be ineffective. In an additional analysis assessing the impact of each quantitative easing program of the central banks, only those of the Fed and European Central Bank are estimated to be significant. The empirical results prove to be robust even if using long-term interest rates as an alternative indicator of quantitative easing.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.747-748
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• 2016

정보보호 관점에서 설계단계에서 수립한 정보보호 구조가 구현단계에서 명확하게 이행되는지를 파악하는 것이 필요하다. 본 논문은 이러한 정보보호 구조가 이뤄지는지를 담당한다. 이러한 구현은 네트워크, 서버, 어플리케이션, 데이터베이스 및 클라이언트 각 영역에서 이루어지게 된다.

• 정보보호학회논문지
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• 제12권2호
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• pp.153-172
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• 2002

본 논문은 이동환경에서 다수의 이동 단말을 대상으로 안전하고 효율적인 멀티캐스트 실현하는 이동보안멀티캐스트 구조 및 프로토콜을 제안하고자 한다. 제안된 이동보안멀티캐스트 구조 및 프로토콜은 이동 단말의 움직임에 따라 적응적으로 이동보안멀티캐스트 서비스를 제공해 줌으로써, 전송지연을 낮추고 키갱신 횟수를 줄임과 동시에 이동 단말의 이동으로 인한 서비스 끊김 및 데이터 손실을 방지하여 이동보안멀티캐스트 서비스의 QoS를 높였다.