• 한국환경보건학회지
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• 제38권5호
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• pp.386-392
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• 2012

Objectives: This study aims to evaluate the blood concentrations and dietary intake for 24-hour food duplicate of low level polycyclic aromatic hydrocarbons (PAHs). Design: The geometric means of the blood concentrations and dietary intake of 16 PAHs in college student candidates were simply compared with instrumental detection. Methods: The concentrations of 16 PAHs in venous blood and 24-hour food duplicates were analyzed with head-space solid phase microextraction (HS-SPME) of gas chromatography-mass spectrometry. Results: Naphthalene, acenaphthylene, pyrene, benz(a)anthracene, chrysene, and acenaphthene among the 16 analyzed PAHs were simultaneously detected both in venous blood and 24-hour food duplicate samples. Conclusion: The main exposure source of the six PAHs is thought to be oral intake from food through low level non-occupational exposure.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.565-567
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• 2004

All IP,NGN(Next Generation Network)으로 대변되는 차세대 네트워크의 특징 중 하나는 이동성이며 노드의 이동뿐만 아니라 네트워크 전체가 이동하는 모바일 네트워크로 진화하고 있다. 차세대 네트워크의 하위 구조를 이루게 될 MANET에 IPv6를 적용하기 위해, 보다 확장성 있고, 유연하며. 빠르고 가벼운 IPv6의 자동 주소 지정 및 중복 주소 탐지에 관해 논의한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.327-330
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• 2011

살아있는 생명체는 세포로 구성되며 성장 분열을 통해 스스로 복제할 수 있는 능력을 지녔다. DNA 상의 변이, 즉 돌연변이는 자손의 생존과 번식에 불리하게 작용할 수 있고 이점을 줄 수 있는 양면성을 지녔다. 본 연구에서는 DNA 이중나선은 복제 주형으로 사용되기 위해서는 먼저 이중나선이 열리고 단일 가닥으로 분리되어야 한다. 이중 나선구조결합에서의 결합의 오류부분의 위치를 찾아내고 복구하는 방법을 제시한다.

• 한국대기환경학회지
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• 제15권2호
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• pp.121-138
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• 1999

This study was carried out to evaluate the performance of a sampling and analytical methodology for the measurement of selected volatile organic compounds (VOCs) in the ambient air. VOCs were determined by the adsorbent tube sampling and automatic thermal desorption coupled with GC/FID and GC/MSD analysis. Target analytes were aromatic VOCs, including BTEX, 1,3,5-and 1,2,4,-trimethylbenzenes(TMBs), and naphthalene. The methodology was investigatedwith a wide range of performance criteria such as repeatability, linearity, lower detection limits, collection efficiency, thermal conditioning, breakthrough volume and calibration methods using internal and external standards. standards. Stability of samples collected on adsorbent tubes during storage was also investigated. In addition, the sampling and analytical method developed during this study was applied to real samples duplicately collected in various indoor and outdoor environments. Precisions for the duplicate samples and distributed volume samples appeared to be well comparable with the performance criteria recommended by USEPA TO-17. The audit accuracy was estimated by inter-lab comparison of both duplicate samples and standard materials between the two independent labs. The overall precision and accuracy of the method were estimated to be within 30% for major aromatic VOCs such as BTEX. This study demonstrated that the adsorbent sampling and thermal desorption method can be reliably applied for the measurement of BTEX in ppb levels frequently occurred in common indoor and ambient environments.

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2001년도 추계학술대회
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• pp.121-127
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• 2001

Seven cyanobacteria strains (Anabaena macrospora NIERl0016, Oscillatoria sp. NIER10042, Microcystis aeruginosa NIER10015, M. ichtyoblabe BIER10025, BIER10040, M. novacekii NIER10029, M. wesenbergii NIER10068) were tested with four rRNA - targeted oligonucleotide probes labelled with horseradish peroxidase (HRP) and specific for cyanobacteria. Non- fluorescent detection of hybridization signal was used. The hybridization with artificial mixture of cyanobacteria have shown the possibility to use 2 species-specific probes in duplicate hybridization and detection with different colored substrates.

• Journal of Electrical Engineering and Technology
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• 제13권6호
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• pp.2447-2455
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• 2018

Security is more important in many sensor applications. The node replication attack is a major issue on sensor networks. The replicated node can capture all node details. Node Replication attacks use its secret cryptographic key to successfully produce the networks with clone nodes and also it creates duplicate nodes to build up various attacks. The replication attacks will affect in routing, more energy consumption, packet loss, misbehavior detection, etc. In this paper, a Secure-Efficient Centralized approach is proposed for detecting a Node Replication Attacks in Wireless Sensor Networks for Static Networks. The proposed system easily detects the replication attacks in an effective manner. In this approach Secure Cluster Election is used to prevent from node replication attack and Secure Efficient Centralized Approach is used to detect if any replicated node present in the network. When comparing with the existing approach the detection ratio, energy consumption performs better.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제20권11호
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• pp.586-591
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• 2014

최근 언제 어디서든 동영상 컨텐츠에 접근할 수 있게 됨으로써 배포된 영상은 쉽게 복사되고, 변형되고 재배포 되어 저작권 보호에 취약하다는 문제점을 내포하고 있다. 따라서 비디오 복사본의 유사도를 검출하고 측정하는 방법들이 요구되어진다. 본 논문에서는 복사본 검출 기술 중 MPEG에서 표준화 한 MPEG-7 Video Signature를 이용하여 다양한 변화를 갖는 동영상에서의 다양한 분별력 분석을 하였다. MPEG-7 Video Signature는 블록기반의 추상화 방식이므로 동영상의 영역 변화에 대해서 취약할 것이라고 가정하고 실험하였다. 분석한 결과 실제로 영역변화에 대해서 일반적으로 일어날 수 있는 강도에서도 매우 취약함을 볼 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제3권3호
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• pp.266-284
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• 2009

The challenges of rapidly growing numbers of mobile nodes in IPv6-based networks are being faced by mobile computing researchers worldwide. Recently, IETF has standardized Mobile IPv6 and Fast Handover for Mobile IPv6(FMIPv6) for supporting IPv6 mobility. Even though existing literatures have asserted that FMIPv6 generally improves MIPv6 in terms of handover speed, they did not carefully consider the details of the whole handover procedures. Therefore, in conventional protocols, the handover process reveals numerous problems manifested by a time-consuming network layer based movement detection and latency in configuring a new care of address with confirmation. In this article, we study the impact of the address configuration and confirmation procedure on the IP handover latency. To mitigate such effects, we propose a new scheme which can reduce the latency taken by the movement detection, address configuration and confirmation from the whole handover latency. Furthermore, a mathematical analysis is provided to show the benefits of our scheme. In the analysis, various parameters are used to compare our scheme with the current procedures, while our approach is focused on the reduction of handover latency. Finally, we demonstrate total handover scenarios for the proposed techniques and discussed the major factors which contribute to the handover latency.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.607-611
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• 2008

본 논문에서는 동영상 복사본 검출을 위해 시공간 정보를 이용한 새로운 동영상 서명 방법을 제안한다. 제안된 동영상 복사본 검출 방법은 각 키프레임에 대하여 동심원 구획방법에 기반을 두고 있다. 우선 입력 동영상으로부터 일정한 간격으로 시간적 이중 선형 보간법을 이용하여 키프레임을 추출하고 각 프레임은 동심원 형태로 구획된다. 구획된 세부영역에 대하여 상대적인 관계를 이용하여 평균 픽셀값, 평균 픽셀값의 차분값, 대칭적 차분값, 원형 차분값 분포의 4 가지 특징 분포를 추출한다. 최종적으로 이 특징 분포들은 간단한 해시 함수를 이용하여 이진 수열 형태로 변형되고 순서대로 병합된다. 제안된 동영상 서명에 대한 유사도 거리는 간단한 해밍 거리를 이용하여 계산되고 따라서 매우 빠른 정합 속도를 보인다. 실험 결과로부터 제안된 방법이 다양한 변형에 대하여 평균 97.4%의 높은 검출 성공률을 보이는 것을 알 수 있다. 그러므로 제안된 방법이 동영상 복사본 검출분야에서 폭넓게 사용될 수 있을 것으로 기대된다.

• 한국대기환경학회지
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• 제32권3호
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• pp.305-319
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• 2016

This study was carried out to evaluate the performance of two sampling methods, i.e., adsorbent tubes and canisters, for the measurement of ambient volatile organic compounds (VOCs). A total of 24 target VOCs were selected from a list of 48 priority hazardous air pollutants (HAPs) in Korea. The two sampling methods were investigated with a wide range of performance criteria such as repeatability, linearity, and lower detection limits. In addition, mean relative errors (MRE) and mean duplicate precisions (MDP) were estimated by inter-lab comparison studies for duplicate field samples. Precisions for the two methods appeared to be well comparable with the performance criteria recommended by USEPA TO-15 and TO-17 for canister and adsorbent methods, respectively. Correlations and variations between the VOCs concentrations determined by the two methods were generally good in most cases. However, MREs and MDPs for individual VOCs appeared to be widely ranged, depending on each VOC. This implies that the two methods have its own advantages and disadvantages in determining a variety of VOCs in ambient air, and neither of which has absolute superiority. Finally, 9 of 24 VOCs were found to be difficult to determine by either methods due to their unstability in a canister, and lack of appropriate standard materials. Thus, it is suggested that development of measurement methods for such unstable VOCs is an urgent task from a viewpoint of HAPs management.