• Proceedings of the KIEE Conference
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• 1998.07d
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• pp.1453-1455
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• 1998

$Ba(Mg,Ta)O_3-Ba(Co,Nb)O_3$ ceramics were prepared by the conventional mixed oxide method. The ceramics were sintered at the temperature of 1500-$1575^{\circ}C$ for 5[hr.] in air. The crystal structure was investigated by the XRD. The microstructure of the ceramics were observed by SEM. The microwave properties of dielectric resonators were investigated as a function of composition and sintering temperature. $Ba(Mg,Ta)O_3-Ba(Co,Nb)O_3$ ceramics have a structure of complex perovskite type, and have peaks of (101),(102),(201),(202) and (212). In the case of the $0.7Ba(Mg,Ta)O_3-0.3Ba(Co,Nb)O_3$ ceramic resonator, dielectric constant, quality factor and temperature coefficient of resonant frequency(TCRF, ${\tau}_l$) were a good value of 26.5, 11.500 at 10[GHz] and -1.3[ppm/$^{\circ}C$] from $25^{\circ}C$ to $60^{\circ}C$, respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.273-276
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• 2011

Voice over Internet Protocol(VoIP) compared to the traditional PSTN communications costs and because of the ease of use has been widespread use of VoIP. Broadband Convergence Network (BCN) as part of building with private Internet service provider since 2010, all government agencies are turning to the telephone network and VoIP. In this paper, we used the Internet on your phone in the IETF SIP-based IP-PBX is a hacking attack analysis studies. VoIP systems are built the same way as a test bed for IP-PBX hacking attacks and vulnerabilities by analyzing the results yielded. Proposes measures to improve security vulnerabilities to secure VoIP.

• Review of KIISC
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• v.14 no.1
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• pp.1-11
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• 2004

NGN 프로젝트를 이어 BCN 프로젝트에 의하여 백엔드 영역은 IP 기반의 네트워크와 브로드밴드접속 서비스의 고도화가 실현될 것이다. 한편 프론트엔드 영역인 비 IP 기반의 네트워크인 NFC에 대한 인프라 구축과 기반기술개발, 유비쿼터스 서비스와 응용에 대한 사업 준비가 요구되는 상황이다. 그래서 차세대 W 서비스와 응용의 세계인 프론트엔드 영역에서 유비쿼터스 컴퓨팅 인프라 구축과 관련 산업 활성화를 위하여 유비쿼터스 컴퓨팅 서비스에 특성에 따라 센서네트워크, 단말 등에 대한 물리적인 보안에 대한 연구가 요구되고 있다.

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.208-208
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• 2006

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.6
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• pp.1360-1364
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• 2013

Internet phone, communication cost and easy-to-use low-cost compared to the PSTN is a mobile phone of a conventional, and use of the Internet phone is spreading. Construction as part of the broadband convergence network(BCN), Internet service provider(KT, SKT, LGU+) has converted to Internet phone telephone network to all government agencies. In addition, members of the public also have an Internet phone service that you are using. In this paper, we analyze the hacking attack on IP-PBX in the IETF SIP-based that are used in Internet telephony, to the study. The test bed is constructed in the same way as the Internet telephone system to perform studies carried hacking attacks on IP-PBX, analyze the results and to extract evidence forensics. When used in crime by hacking the Internet telephone, we propose a method which can be used as evidence in forensic having legal effect.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.197-200
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• 2013

Internet phone, communication cost and easy-to-use low-cost compared to the PSTN is a mobile phone of a conventional, and use of the Internet phone is spreading. Construction as part of the broadband convergence network(BCN), Internet service provider(KT, SKT, LG) has converted to Internet phone telephone network to all government agencies. In addition, members of the public also have an Internet phone service that you are using. In this paper, we analyze the hacking attack on IP-PBX in the IETF SIP-based that are used in Internet telephony, to the study. The test bed is constructed in the same way as the Internet telephone system to perform studies carried hacking attacks on IP-PBX, analyze the results and to extract evidence forensics. When used in crime by hacking the Internet telephone, we propose a method which can be used as evidence in forensic having legal effect.

• Transactions on Electrical and Electronic Materials
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• v.8 no.2
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• pp.84-88
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• 2007

[ $Bi_{1.5}Zn_{1.0}Nb_{1.5}O_7$ ] (BZN), $Bi_2Mg_{2/3}Nb_{4/3}O_7$ (BMN), and $Bi_2Cu_{2/3}Nb_{4/3}O_7$ (BCN) pyrochlore thin films were prepared on $Cu/Ti/SiO_2/Si$ substrates by pulsed laser deposition and the micro-structural and electrical properties were characterized for embedded capacitor applications. The BZN, BMN, and BCN films deposited at $25\;^{\circ}C$ and $150\;^{\circ}C$, respectively show smooth surface morphologies and dielectric constants of about $39\;{\sim}\;58$. The high dielectric loss of the films deposited at $150\;^{\circ}C$ compared with films deposited at $25\;^{\circ}C$ was attributed to the defects existing at interface between the films and copper electrode by an oxidation of copper bottom electrode. The leakage current densities and breakdown voltages in 200 nm thick-BMN and BZN films deposited at $150\;^{\circ}C$ are approximately $2.5\;{\times}\;10^{-8}\;A/cm^2$ at 3 V and above 10 V, respectively. Both BZN and BMN films are considered to be suitable materials for embedded capacitor applications.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.8
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• pp.1231-1237
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• 2022

It is necessary to dynamic recognition system with real time loading height and pressure of the loading waste, the drying of wood, batteries, and plastic wastes, which are representative compositional wastes, and the carbonization changes on the surface. The dynamic context awareness service constituted a platform based on Universal Middleware system using BCN convergence communication service as a Ambient SDK model. A context awareness system should be constructed to determine the cause of the fire based on the analysis data of fermentation heat point with natural ignition from the load waste. Furthermore, a real-time dynamic service platform that could be apply to the configuration of scenarios for each type from early warning fire should be built using Universal Middleware. Thus, this issue for Internet of Things realize recognition platform for analyzing low temperature fired fire possibility data should be dynamically configured and presented.

• Journal of the Korea Institute of Military Science and Technology
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• v.14 no.1
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• pp.84-91
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• 2011

The Systems Interoperability Test and Evaluation System(SITES) is an T&E support tool for both information system and weapon system. The SITES was developed by reference to the Level of Information Systems Interoperability(LISI) in US. We use the tool via MND Broad convergence Network(BCN) in order to assess information system's interoperability. Nowadays, there are many ongoing researches on expanding assessment capability into weapon systems. As part of those research topics, this paper analyze the characteristics of tactical data-link messages which is the way to exchange the information among the weapon systems, and reflect that characteristics in interoperability level assessment.

• TTA Journal
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• s.98
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• pp.11-19
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• 2005

정보통신 환경의 새로운 패러다임 변화에 대응하기 위한 기술개발, 표준화, 시험망 구축 등의 국가적 노력과, 융합 서비스를 통하여 고수익성 시장 창출을 위한 사업자들의 투자가 요구되고 있다. 그러나 새로운 수익모델 창출에 대한 어려움과 신기술 개발에 따른 투자위험, 신규 서비스에 대한 도입 타당성 및 시장성, 망 구축 비용 및 운용비 등 통신사업 전개에 대한 불확실성으로 인해 많은 부담을 안고 있는 것도 사실이다. 무엇보다도 BcN환경에서 뚜렷한 Killer application이 없다는 비관론으로 광대역통합 인프라의 불필요성에 대한 논란은 Bcn환경 구축 전개 시점에 있어 적지 않은 영향을 미치고 있다. 본 고에서는 NGN 구축의 필요성 및 이와 관련된 표준화 단체의 표준현황 및 우리나라의 잠재 성장동력인 BcN망을 통해 CDMA와 같은 새로운 신화창조를 이루려는 정부의 움직임에 발맞추어 NGN 표준화 대상기술 및 표준화 전략에 관한 것에 대해 나름대로 의견을 적어보고자 한다.