• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.568-570
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• 2018

최근 이동통신기술의 급속한 발달과 보급으로 LTE(Long Term Evolution) 기술은 스마트폰 서비스를 넘어 산업통신이나 긴급통신을 비롯하여 다양한 분야로 확대되고 있다. 본 연구에서는 LTE 기술의 응용 분야로서 LTE-R을 기반으로 하는 철도통신의 서비스 분야 가운데 하나인 음성서비스의 전송성능을 분석하고자 한다. 본 연구에서는 LTE-R 네트워크의 응용서비스 관점에서 성능을 분석하여 응용서비스가 사용자 만족도에 미치는 영향을 살펴본다. 분석방법으로는 NS(Network Simulator)-3에 기반한 컴퓨터 시뮬레이션을 사용하며 분석대상 트래픽으로는 VoIP(Voice over Internet Protocol) 규격 음성트래픽을 사용한다. 본 연구의 결과는 LTE-R 네트워크 구축뿐 아니라 LTE-R 네트워크를 대상으로 하는 응용서비스 개발에 활용이 가능하다. 다음은 요약문 입니다.

• 한국통신학회논문지
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• 제21권10호
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• pp.2687-2702
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• 1996

It is desirable that the implementation of next generation information infrastructure is the Integrated Network combining the satellite and the terrestrial network. The application of the ATM network being the dominant infrastrure of terrestrial network to the satellite network is being studied variously. Considering these concepts, this paper analyzes due to ATM transport via satellite, evaluates the degradation of QoS and proposes reliable method of ATM cell transport via satellite. Because ATM is investigated with the optical fiber which is almost error free characteristics, the practical application of ATM transport via satellite essentially need the channel coding(FEC:Forward Error Correction) to enhance BER performance. But using the FEC coding, satellite link has burst error characteristics which evoke severe performance degradation fo ATM QoS. Therefore in satellite link, we analyze burst error characteristics using experimental results of computer simulation. Then to compensate these characteristics, based on this analysis and HEC dual mode algorithm we propose various interleaver structures(Block interleaver, Intra interlever, and Inter-Intra interleaver) to improve cell transmission QoS. We execute performance evaluations of iterleaver structures by computer simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
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• pp.77-79
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• 2004

Because robot hardware architecture generally is consisted of a few sensors and motors connected to the central processing unit, this type of structure is led to time consuming and unreliable system. For analysis, one of the fundamental difficulties in real-time system is how to be bounded the time behavior of the system. When a distributed control network controls the robot, with a central computing hub that sets the goals for the robot, processes the sensor information and provides coordination targets for the joints. If the distributed system supposed to be connected to a control network, the joints have their own control processors that act in groups to maintain global stability, while also operating individually to provide local motor control. We try to analyze the architecture of network-based humanoid robot's leg part and deal with its application using the CAN(Controller Area Network) protocol.

• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.121-128
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• 2022

There are much processing techniques of microwave circuits, whose dimensions are small compared to the wavelength, but the disadvantage is that they cannot be directly applied to circuits working at high and/or low frequencies. In this article, we will consider the bond graph approach as a tool for analyzing and understanding the behavior of microwave circuits, and to show how basic circuit and network concepts can be extended to handle many microwaves analysis and design problems of practical interest. This behavior revealed in the scattering matrix filter, and which will be operated from its reduced bond graph model. So, we propose in this paper, a new application of bond graph approach jointly with the scattering bond graph for a high frequency study.

• 인터넷정보학회논문지
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• 제7권3호
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• pp.53-60
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• 2006

인터넷을 통해 전송되는 트래픽의 양이 지속적으로 증가하고 있기 때문에 네트워크 트래픽 모니터링 시스템이 모든 패킷을 실시간으로 분석하기는 어렵다. 피어-투피어(P2P), 스트리밍 미디어, 메신저 등과 같이 동적으로 포트 번호를 할당받는 애플리케이션의 사용이 늘어나면서, 사용자들은 이들이 유발하는 트래픽을 분석하기를 원하고 있다. 이 같은 고수준의 분석을 위해서는 각 패킷마다 많은 처리 시간이 필요로 한다. 본 논문에서 부하 차단기를 이용하여 패킷의 수를 제한할 것을 제안한다. 선택된 패킷은 어떤 애플리케이션이 생성한 것인지 식별된 후, 정의된 애플리케이션 계층의 프로토콜에 따라 분석된다.

• 한국정보통신학회논문지
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• 제25권10호
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• pp.1375-1380
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• 2021

우리나라는 재난안전통신망 개통 초기로 응용서비스 앱에 대한 보안 대응은 아직은 미흡한 실정이기에, 이에 대한 선제적 보안 대응이 반드시 필요하다. 본 연구에서는 재난안전통신망에서 앱을 유통하는 앱 스토어와 전용 단말에서 앱이 동작되는 안드로이드 운영체제에 대한 잠재적 취약점을 사전 예방하고자 '재난안전망 앱 보안 체계 구축'을 제안하였다. 응용서비스 앱이 재난안전통신망 모바일 앱스토어에 등재하고자 하기 위해서는, 우선 악성 및 정상 앱에 대한 데이터 셋을 구축하여 피쳐를 추출하고 가장 효과적인 AI 모델을 선정하여 정적 및 동적 분석을 수행한다. 분석 결과에 따라 악성 앱이 아닌 경우에 대해서 '안전 앱 인증서'를 인증하여 공인 앱에 대한 신뢰성을 확보한다. 궁극적으로 재난안전통신망 앱의 보안 사각지대를 최소화하고 인증된 앱의 재난안전 응용 서비스 지원으로 재난상황에 대한 통신망의 안전성을 확보할 수 있다.

• International Journal of Computer Science & Network Security
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• 제22권2호
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• pp.223-231
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• 2022

The application of computer software into the linguistic analysis of texts proves useful to arrive at concise and authentic results from large data texts. Based on this assumption, this paper employs a Computer-Aided Text Analysis (CATA) and a Critical Discourse Analysis (CDA) to explore the manipulative strategies of positive/negative presentation in Orwell's Animal Farm. More specifically, the paper attempts to explore the extent to which CATA software represented by the three variables of Frequency Distribution Analysis (FDA), Content Analysis (CA), and Key Word in Context (KWIC) incorporate with CDA decipher the manipulative purposes beyond positive presentation of selfness and negative presentation of otherness in the selected corpus. The analysis covers some CDA strategies, including justification, false statistics, and competency, for positive self-presentation; and accusation, criticism, and the use of ambiguous words for negative other-presentation. With the application of CATA, some words will be analyzed by showing their frequency distribution analysis as well as their contextual environment in the selected text to expose the extent to which they are employed as strategies of positive/negative presentation in the text under investigation. Findings show that CATA software contributes significantly to the linguistic analysis of large data texts. The paper recommends the use and application of the different CATA software in the stylistic and corpus linguistics studies.

• 한국IT서비스학회지
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• 제10권1호
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• pp.47-64
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• 2011

In the IT(Information Technology) service, which supply the solutions related to business management and IT, network construction and application trends, the related service business are increasing according to the enlargement of project scope and the diversity of project types as the need of service customers. In this paper, I propose the significant effect factors on the network management of IT service firms. The key findings are from the analysis result about 94 IT service firms as follows. For implementation the high performance of network management in the IT service firms, the strategic elements in the process of network construction are more conceived highly than the basic element in them. Also the perspective of project objectives are considered than the nominal perspectives in the partner selection process. The competency of partner firms', the cooperation process between the partner firms', network relation operation management and network relation structure management are the significant effect factors of network management.

• 한국전기전자재료학회논문지
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• 제16권12S호
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• pp.1310-1315
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• 2003

GIS(Gas Insulated Switchgear) is power equipment with excellent dielectric strength and is economy merit in high confidence and stability. But, because of structural characteristics, this is difficult to monitor externally and provide much loss in the event of an accident. Recently, because equipment of GIS is occurring problem of confidence used for a long time, development of diagnosis technique have been importantly recognized. therefore, measurement and analysis of PD much has been generally used for equipment of GIS. But, in case of measurement of PD at field, real trouble signals is difficult to classify noise. Accordingly, a variety of trouble conditions for DS are simulated, and detected signals are analyzed by the application of electrical and mechanical methods. For this analysis, detected signals are accumulated according to phase-magnitude with the application of induction sensor, and then we analyzed the characteristics. For the simulation experiment, we make DS for 170KV GIS and analyze the characteristics of detected signals with the application of neural network algorithm. last, we have measured DS for GIS at field, and then have analyzed detected signals.

• 조명전기설비학회논문지
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• 제29권12호
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• pp.88-96
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• 2015

This paper describes a new method for enhancing the accuracy of network analysis applications in energy management systems. Topology processing, state estimation, power flow analysis, and contingency analysis play a key factor in the stable and reliable operation of power systems. In this respect, the aim of topology processing is to provide the electrical buses and the electrical islands with the actual state of the power system as input data. The results of topology processing is used to input of other applications. New method, which includes the topology error analysis based on inconsistency check, coherency check, bus mismatch check, and outaged device check is proposed to enhance the accuracy of network analysis. The proposed methodology is conducted by energy management systems and the Korean power systems have been utilized for the test systems.