• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.1 no.3
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• pp.61-67
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• 2008

In the course of research, the program that is able to process files through gcc and imput them into the database has been developed, using Syslog-ng based Unix system. PostgreSQL and PHP are used for database and Web-based server side script respectively.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.322-324
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• 2002

최근에 지역적으로 분산된 컴퓨팅 자원을 어디에서나 활용할 수 있도록 해주는 GRID가 많은 주목을 받고 있다. 특히 단백질 분자모사나 고에너지 물리학 분야 둥과 같이 매우 많은 계산을 요구하는 분야에서는 GRID를 통해서 계산 자원을 제공받을 수 있다. GRID에서 제공되는 계산 능력을 잘 활용하기 위해서 각 분야에서 사용되는 어플리케이션을 병렬화 할 수도 있지만 이미 계산 방법이나 결과가 검증되어 있는 기존의 패키지를 활용하는 것도 매우 중요하므로 기존 패키지에 의한 직렬 또는 지역적으로 병렬인 프로세스를 매우 많이 생성하여 GRID를 채우는 것도 한 방법이라 하겠다. 일반적으로 이와 같은 패키지는 기동할 때에 패러미터 파일을 참조하게 되고 그 계산 결과는 매우 큰 파일로 출력이 되는데 본 논문에서는 대용량 파일에 의해서 프로세스간에 동기화 및 통신을 이루어야할 때 발생하는 문제를 해결하는 방안을 제시한다. 동기화와 통신을 동시에 다루어야 하므로 Linda 개념을 도입하였으며 기존 Linda에서는 Tuple Space안에서 대용량 파일 처리를 고려하기 어려우므로 이에 대한 해결책을 제안하였다.

• Annual Conference of KIPS
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• 2013.05a
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• pp.49-51
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• 2013

본 논문에서는 효율적인 전력사용을 위해 가정에서 사용하는 대기전력을 모니터링 할 수 있는 시스템을 구현하였다. 무선 근거리 통신을 지원하는 RF통신을 이용한 콘센트를 이용하여 가전기기의 현 상태에 따라 평균 전력량을 대입, 예상 전력량을 계산하여 임베디드 보드 및 스마트폰에서 전력량을 실시간으로 모니터링 할 수 있도록 시스템을 구현 하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.2
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• pp.69-74
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• 2004

Threshold digital signature is very useful for networks that have no infrastructure such as ad hoc network Up to date, research on threshold digital signature is mainly focused on RSA and DSA. Though Schnorr's digital signature scheme is very efficient in terms of both computation and communication. its hard structure using interactive proof prevents conversion to threshold version. This paper proposes an efficient threshold signature. scheme based on the Schnorr's signature. It has a desirable property of scalability and reduces runtime costs by precomputation.

• Electronics and Telecommunications Trends
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• v.36 no.2
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• pp.12-21
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• 2021

Intelligent radar sensors are applied in many industries, such as the automobile, aerospace, and defense industries (for security and surveillance), and for traffic monitoring and management as well as environmental and weather monitoring. Furthermore, they are used in smart cities, homes, and buildings, wherein intelligent motion sensing is required in daily life. It is mentioned that it is being used. In addition, ETRI introduces a phased array-based intelligent radar for drone detection and a human name detection radar technology based on which humans can be detected in case of a disaster.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.1
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• pp.201-209
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• 2014

This paper proposes a genetic algorithm to maximize the connectivity among the mobile nodes for the cooperative communication in ad-hoc networks. In general, as the movement of the mobile nodes in the networks increases, the amount of calculation for finding the solution would be too much increased. To obtain the optimal solution within a reasonable computation time for a high-density network, we propose a genetic algorithm to obtain the optimal solution for maximizing the connectivity. In order to make a search more efficient, we propose some efficient neighborhood generating operations of the genetic algorithm. We evaluate those performances through some experiments in terms of the maximum number of connections and the execution time of the proposed algorithm. The comparison results show that the proposed algorithm outperforms other existing algorithms.

• Journal of Korea Multimedia Society
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• v.16 no.12
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• pp.1403-1412
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• 2013

In the maritime ships or airplanes, users should utilize the satellite channel in orer to use web service. However, the satellite channel is costly and does not give users satisfied response time. In the ship, the users may receive plenty of extra data when they obtain internet news. The extra data may be unnecessary image and advertise. Therefore, they should pay unnecessary data usage charges as well. In this paper, we suggest a proxy model that solves the problem of cost and speed. The proposed proxy reduces the of data through the satellite link by image and advertising blocking, caching, image re-requesting functions. It's performance was tested by a real satellite communication.

• Journal of the Korea Society for Simulation
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• v.21 no.2
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• pp.69-78
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• 2012

In this paper, a study on finding an appropriate helper node that can help increase effective frame transmission rate for cooperative communications at ad hoc networks is carried out. Those researches from reference use the reactive helper node selection mechanism which starts its role after exchanging RTS and CTS frames between source and destination nodes, and are implemented into our simulator for performance comparison. System throughput and average channel access delay are used for performance measures and all communicating nodes are assumed to move independently within the communication range. It is anticipated that this research result can be used as basic information for designing a new efficient helper node selection scheme.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.2 no.1
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• pp.87-99
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• 1998

In the multicasting communications, the quality of service is not guaranteed occasionally, according to the shortage of resources, because all resources such as communication buffer, processing power for the packet multiplication, and bandwidth, should be shared among each members. This problem can be solved through the hierarchical multicaster construction mechanism which guarantees that all multicaster can be operated within the required performance. This paper proposes the architecture of multipoint communication server based on hypercube type massively parallel computer. Through the simulation, it is verified that the traffic of links between each node of hypercube computer is under the some bandwidth. So, it is certified that the hypercube computer is suitable for the multicast communication servers supporting the various groups.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.5
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• pp.821-827
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• 2008

This paper presents the prediction model of attenuation characteristics of satellite communication signals operating in the range from 1 to 20GHz, associated with the effects of the Asian Dust. And this paper analyze the effects of the Asian Dust in theory that dust particles size and density, OPC, signal levels, exponentail distribution and the permittivity. The prediction model of the dust attenuation was got, combining the formula of the complex dielectric constant of Asian dust. Expressions for specific attenuation and attenuation are derived in terms of the height, visibility. Therefore it make an investigate to the prediction model of attenuation characteristics continuously.