• Journal of Korea Society of Industrial Information Systems
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• 제17권5호
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• pp.19-28
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• 2012

Recently a grid and cloud computing collaboration have become a social issue. These collaborative network system, the P2P system based on this system. Distingui shed from the client/server systems, P2P systems in order to exchange information, its purpose and functions are divided according to the morphological Category. In accordance with the purposes and functions of information and data retrieval, remote program control and integration services for the offers. Most P2P systems client/server scalability, and management takes the form, but to overcome the disadvantages in terms of applying the mixed-mode system is increasing. And recently the distributed computing aspects of the service to users in order to provide suitable to accommodate the diverse needs of various types of mobile agent technology is needed. In this paper, as required by the mobile agent access to a remote resource access control and agent for the execution and management capabilities and improve the reliability of the mobile agent system designed to suggest.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• 제12권6호
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• pp.279-283
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• 2012

In is paper, we design and implement the low power, high speed touch screen controller that calculates and outputs the coordinate of touch point on the touch screen of mobile devices. The system clock is 10HMz, the number of input channels is 21, standby current is $20{\mu}A$, dynamic range of input is 140pF~400pF and the response time is 0.1ms/frame. It contains the power management unit for low power, automatic impedance calibration unit in order to adapt to humidity, temperature and evaluation board, adjacent key and pattern interference suppression unit, serial interface unit of I2C and SPI. The function and performance is verified by using FPGA and $0.18{\mu}m$ CMOS standard process. The implemented touch screen is designed for using in the double layer ITO(Indium Thin Oxide) module with diamond pattern and single layer ITO module for cost-effective which are applied to mobile phone or smart remote controller.

• The Journal of the Korea institute of electronic communication sciences
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• 제16권1호
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• pp.69-74
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• 2021

This paper introduces a low-power voltage-controlled oscillator(VCO) with filters that consist of resistors and capacitors. The proposed VCO contains a 5-stage current mode buffer, and each buffer cell has a resistor-capacitor filter that connects input and output terminals. The filter adds a zero to the buffer cell. Because the zero moves the oscillation condition to high frequencies, the proposed VCO can generate a high frequency clock with low power consumption. The proposed circuit has been designed with 0.18 ㎛ CMOS process. The power consumption is 9.83 mW at 2.7 GHz. The proposed VCO shows 3.64 pJ/Hz in our simulation study, whereas the conventional circuit shows 4.79 pJ/Hz, indicating that our VCO achieves 24% reduction in power consumption.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제29권2B호
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• pp.250-262
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• 2004

In IPv6 environment, the Internet Telephony, VoD(Video on Demand) and high capacity file exchange service will be more increased than IPv4. Therefore, the strict guarantee of QoS based on End-to-End and differentiated quality control schemes are simultaneously required. This paper proposes the flow control schemes on IPv6 network that the traffic is identified by flow and the QoS of multi-service is improved by QoS information in IPv6 hop-by-hop option header. The object of flow control includes not only non-default QoS traffic, which uses the flow label, but also best-effort or encrypted traffic. Therefore, the guarantee of real-time service is strengthened and the flow, which abuses unnecessarily the network resources, is effectively controlled. Also, this paper proposes the mapping scheme between the flow and MPLS by reflecting the minimum change of the existed network resource and the status of backbone network of ISP(Internet Service Provider). In the simulation result, It is shown that the proposed scheme is effective in the side of QoS on real-time services and utilization of backbone resources.

• Journal of IKEEE
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• 제14권4호
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• pp.257-262
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• 2010

We design a CMOS front-end with wide variable gain and low power consumption for 5.25 GHz band. To obtain wide variable gain range, a p-type metal-oxide-semiconductor field-effect transistor (PMOS FET) in the low noise amplifier (LNA) section is connected in parallel. For a mixer, single balanced and folded structure is employed for low power consumption. Using this structure, the bias currents of the transconductance and switching stages in the mixer can be separated without using current bleeding path. The proposed front-end has a maximum gain of 33.2 dB with a variable gain range of 17 dB. The noise figure and third-order input intercept point (IIP3) are 4.8 dB and -8.5 dBm, respectively. For this operation, the proposed front-end consumes 7.1 mW at high gain mode, and 2.6 mW at low gain mode. The simulation results are performed using Cadence RF spectre with the Taiwan Semiconductor Manufacturing Company (TSMC) $0.18\;{\mu}m$ CMOS technology.)

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• 제14권4호
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• pp.284-291
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• 2021

In this paper, we study the consensus problem for multi-agent systems with input saturations. The goal of consensus is to achieve a swarming behavior of multi-agent systems by reaching the agreement through information exchange. This paper considers agents modeled by first-order dynamics with input saturations. In order to guarantee the global convergence of the agents, it is assumed that the agents are stable. Moreover, considering the disturbances, we propose the PI based duplex control method to achieve the consensus. The proposed P controller and I controller are composed of different information network. Then, we investigate the conditions of the information networks and the control gains of P, I controllers to achieve the consensus applying the Lyapunov stability theorem and the Lasalle's Invariance Principle. Finally, we conduct the simulations to validate the theoretical results.

• Proceedings of the KIEE Conference
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2625-2627
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• 2004

Recently many technology of the T.T.P.(Train Tilting Processor) has been introduced for an efficient real-time operating system. but the problems of testing increasing complex digital integrated system continue to challenge the design and test community. Design main processor part that can be used on railroad synthesis control part by ARM CORE chip.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2003년도 추계학술발표논문집 (중)
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• pp.967-970
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• 2003

시간과 공간의 제약 없이 홈 네트워크 내의 가전기기들을 제어하고 모니터링하기 위해서는 모바일 단말기의 사용이 필수적이다. 본 논문에서는 모바일 단말기를 통하여 댁내 가전기기를 제어하고 모니터링하기 위한 홈 게이트웨이의 구조와 모바일 단말기를 위한 메시지를 설계하고 테스트한다. 모바일 단말기는 멀티 리모콘 기능을 하며 다중 무선 네트워크를 지원한다. 홈 게이트웨이는 모바일 에이전트와 UPnP 컨트롤 포인트, 브리지로 구성하고 UPnP 메시지와 모바일 바이너리 메시지간의 메시지 매핑을 수행한다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2003년도 추계학술발표논문집 (하)
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• pp.1791-1794
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• 2003

오늘날 인터넷이 활성화됨에 따라 내 외적 환경에 대한 보안의 필요성이 나날이 강조되고 있다. 특히 최근에는 개별 PC를 통한 메신저의 사용과 P2P 응용이 확장되고 있는 추세이므로 인터넷상의 개별 호스트에 대한 보안과 관리가 매우 중요하다. 이에 본 논문에서는 윈도우 기반의 개인 PC를 포함한 네트워크 상의 호스트에서도 외부의 접근 제어나, 패킷외 정보, 로그파일 기록, 모니터링을 이용하여 실시간으로 네트워크 상의 호스트의 상태를 관리, 파악하는 호스트 기반의 접근제어시스템을 설계 및 구현하였다.

• Proceedings of the KIPE Conference
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.65-66
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• 2012

부하 시스템의 용량 증대와 중요도에 따른 신뢰성 향상을 위해 Uninterruptible Power Supply(UPS)의 병렬운전 연구가 활발히 진행되고 있다. 본 논문은 droop특성을 적용한 3상 UPS의 병렬운전 제어 알고리즘을 제안한다. 또, 기존의 droop 제어기를 적용한 UPS의 plug-and-play(PnP) 운전시 순환 전류의 원인을 분석하고 PnP 운전이 가능한 droop 제어기를 제안한다. 그리고 제안된 알고리즘의 타당성을 검증하기 위해 PSIM을 통해 시뮬레이션을 수행하였다.