• 한국컴퓨터정보학회논문지
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• 제20권9호
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• pp.47-53
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• 2015

In this paper, we propose a novel tangible interface system whose system does not use the expensive hardware is introduced. This proposed tangible interface is used on the table top capacitive multi touch-screen. The tangible interface apparatus which is called smart puck has sanguine arduino compatible board. The board has a Cds photo-sensing sensor and the EPP8266 WiFi module. The Cds sensor decodes the photometric PWM signals from the system and sends corresponding information to the system via TCP/IP. The system has a server called MT-Server to communicate with the smart pucks. The tangible interface shows reliable operation with fast response that is compatible to the expensive traditional devices in the market.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.3028-3030
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• 2000

In general. a speech coding is dedicated to the compression performance or the speech quality. But. the speech coding in this paper is focused on the performance of flexible transmission to the, network speed. For this. the subbanding coding is needed. which is used the wavelet packet concept in the signal analysis. The extraction of each frequency-band is difficult to general signal analysis methods, after coding each band, the reconstruction of these is also a difficult problem. But. with the wavelet packet concept(perfect reconstruction) and its fast computation algorithm. the extraction of each band and the reconstruction are more natural. Also, this paper describes a direct solution of the voice transmission on network and implement this algorithm at the TCP/IP network environment of PC.

• 사물인터넷융복합논문지
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• 제6권3호
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• pp.1-6
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• 2020

본 논문은 평균 객체 전송 지연 시간에 대한 기존의 모델들을 하나의 프레임워크로 통합하고 실제 계산 경험을 통해 결과를 분석하는 것을 목표로 한다. 해석적 객체 전송 지연 시간 모델은 다중 패킷 손실과 작은 혼잡제어 윈도우로 인해 빠른 재전송이 불가능한 멀티홉 무선 네트워크를 위시한 사물 인터넷(IoT) 환경을 가정한다. 이 모델은 또한 초기 혼잡 윈도우 크기와 하나의 혼잡 윈도우에서의 다중 패킷 손실을 고려한다. 성능평가에 의하면, 전송 객체 크기와 패킷 손실률이 작은 경우 평균 객체 전송 지연의 하한값과 상한값은 거의 동일하다. 그러나 패킷 손실률이 커지면 초기 혼잡 윈도우의 크기와 왕복 시간이 평균 객체 전송 지연의 상·하한값에 영향을 미치는 것으로 나타났다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.229-234
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• 2008

The new millennium has started with several innovations driven by fast evolution of the technologies in energy sector. A strong impulse towards the diffusion of new economical efficient technologies regulatory incentives related to energy production from renewable source and a small scale building trigeneration and to promotion of more sustainable environmental-friendly generation solutions, the evolution of electricity markets, more and more binding local emission constraints, and the need for improving the security of supply to reduce the energy system vulnerability. The 24 percentage energy quantify of total energy consumption consumes in commercial buildings and residential houses and the 30% portion of total $CO_2$ emissions covers also in the commercial buildings and residential houses sector. To cope with efficiently this energy sinuation in building sector, Building microgrid or building tooling, heating & power(BCHP) system has been interested in recent day due to meeting thermal and electric energy requirements efficiently and with appropriate energy quality. A multi agent system is a collective of intelligent agents that communicate with each other and work cooperatively to achieve common goals. Also, it is to medicate and coordinate communication between Control Areas and Security Coordinators for teal-time control of the BCHP system and the power pid. In this new circumstance, it is very important to integrate the power and energy delivery system and the information system(communication, networks, and intelligent equipment) that controls it. Therefore, development of smart control modules with open communication protocol and seamlessly interchange the data and information between control network and data network including extranet and intranet give a great meanings. We designed and developed the TCP/IP-CAN IED agent modules and ModBus./LonTalk/(TCP/IP) IED agent ones to configure the multi-agent system based smart energy network of commercial buildings and also intelligent algorithms for inverter fault diagnostics which ran be operated in control level or agent level network.

• 한국전자통신학회논문지
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• 제13권6호
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• pp.1183-1190
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• 2018

전 세계적으로 환경규제가 지속적으로 강화되고 있으며 이에 효과적으로 대응하기 위해 전기자동차의 도입이 적극적으로 고려되고 있으며, EV 보급의 필수요소인 충전인프라 구축이 필수적이다. 본 논문에서는 스마트한 충전인프라 구축에 필수적인 전력선 통신 기술에 대하여 연구하였다. ISO/IEC 15118 국제표준에 부합한 HPGP규격의 물리계층 속도 10Mbps 및 TCP/IP계층 4.5Mbps 성능을 달성할 수 있는 제어보드와 해당 보드에 탑재되어 국제표준에 부합하는 충전단계 및 향후 지능형전력망과의 연계를 위한 기능을 수행할 소프트웨어 솔루션을 개발하였다. 또한 Combo 방식의 DC 급속충전기에 적용하기 위해 산업 환경 기준에 적합하도록 하드웨어를 설계하였으며 소프트웨어 솔루션과 함께 통합하여 V2G 통신 모듈을 개발하였다.

• 한국통신학회논문지
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• 제38C권12호
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• pp.1134-1149
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• 2013

Pub/sub 기술은 메시지 기반으로 데이터 생성자의 위치, 시간, 동기화 등에 대한 데이터에 제한 없이 접근할 수 있게 하는 특징을 가지므로, 데이터 중심 서비스를 위한 미들웨어 구축 기술로 널리 활용되고 있다. 국제 표준화 기구인 OMG (Object Management Group)에서 정의한 DDS (Data Distribution Service)는 pub/sub 기반의 미들웨어 기술로서, 미국 군용 장비의 표준 미들웨어로 채택되는 등 그 유용성이 높이 인정받고 있다. 그러나 publisher와 subscriber가 밀집된 환경에서는, 시스템 초기 부팅 시에 시스템 내 data 생산과 소비 주체가 되는 Participant와 Endpoint들을 탐색하는 과정에서의 지연 시간이 길다는 문제점을 갖고 있다. 본 논문에서는 지역적으로는 넓지 않지만 시스템 내의 Participant와 Endpoint의 수가 밀집된 환경에서의 탐색 시간을 줄일 수 있는 방안을 제시한다. 기존의 DDS 표준에서 정의하고 있는 표준 탐색 단계인 Participant 탐색 단계와 Endpoint 탐색 단계를 통합하고 분산 해쉬 기법의 Successor 개념을 도입하여 각 Participant마다 메시지를 전달해야 하는 대상의 수를 줄였다. 메시지 전달대상의 수를 줄임으로써 전송 프로토콜로 TCP를 적용하는 것이 가능해져, 메시지 전달의 신뢰성을 높일 수 있었다. 네트워크 시뮬레이터를 통한 성능 평가에서 본 연구에서 제안한 기법이 기존 기법에 비해 10%의 탐색 시간으로 시스템 내 Participant와 Endpoint를 발견할 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제3권4호
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• pp.399-422
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• 2009

Although current wireless mesh network (WMN) applications experience a perceptually uninterrupted hand-off, their throughput after the hand-off event may be significantly degraded due to the low available bandwidth of the mobile client's new master. In this paper, we propose a novel mobility management scheme for 802.11-based WMNs that enables both seamless hand-off for transparent communications, and bandwidth awareness for stable application performance after the hand-off process. To facilitate this, we (i) present a new buffer moment in support of the fast Layer-2 hand-off mechanism to cut the packet loss incurred in the hand-off process to zero and (ii) design a dynamic admission control to grant joining accepts to mesh clients. We evaluate the benefits and drawbacks of the proposal for both UDP and TCP traffic, as well as the fairness of the proposal. Our results show that the new scheme can not only minimize hand-off latency, but also maintain the current application rates of roaming users by choosing an appropriate new master for joining.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.129-132
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• 2004

A guard lamp system has been installed at the PV positive center, located at Gwangju in Korea. Digital environment that is represented to internet is displacing business way of industry and business achievement way with the fast speed being giving great change on life whole, improve existence business process utilizing internet and Web connection technology, information superhighway to tradition industrialist manufacture and e-transformation's propulsion that wish to maximize productivity and administration efficiency is spread vigorously. In this paper, we wish to accomplish generation equipment's heighten stability and believability through remote monitoring and control of guard lamp system. This paper describes the design of the monitoring system for the sensing data and indirect controlling of the guard lamp system. Most of the conventional monitoring systems depend on the special hardware and software. The essential design of monitoring system is to provide the convenience for the user and the portability for the system. In order for the system to fulfill its requirements, it was designed using Labview GUI facility based on the Windows 2000 environment of IBM PC compatible and Add-oncard based on the TCP/IP protocol. Advantage of the monitoring system are a personnel expenses curtailment effect, of the place restriction and unmanned system of the generationplants, etc..

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.211-214
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• 2006

The outer race of the constant velocity(CV) joint is an important load-supporting automotive part, which transmits torque between the transmission and the wheel. The outer race is difficult to forge, because its shape is very complex and the required dimensional tolerances are very stringent. Therefore, the internet based shape inspection system is developed in this study to provide quick and accurate data through the easy control from users. Proposed system uses mechanical displacement sensors to measure the shape of CV joint that has six inner ball grooves, and commercially available Lab-View program is used to process measured data into the dimensional shape. Developed program provides a simple user interface that enables users real-time access of data measured from industrial production lines. Furthermore, it can exchange measured data via the internet between users and forging system operators. A java applet helped the system connection via internet. A data, IP access, is transmitted to the packet by TCP/IP. Our proposed system has many advantages over current measuring systems including fast and efficient data processing by real-time control, and system flexibility.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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• pp.171-173
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• 2003

Digital environment that is represented to internet is displacing business way of industry and business achievement way with the fast speed being giving great change on life whole, improve existence business process utilizing internet and Web connection technology, information superhighway to tradition industrialist manufacture and e-transformation's propulsion that wish to maximize productivity and administration efficiency is spread vigorously. In this paper, we wish to accomplish generation equipment's heighten stability and believability through remote monitoring and control of PV system. This paper describes the design of the monitoring system for sensing the monitoring data and indirect controlling of the PV system. Most of the conventional monitoring system depend on the special hardware and software. Basic design goal of monitoring system is to provide the convenience for the user and the portability for the system. In order for the system to fulfill its requirements, it was designed using Labview GUI facility based on the Windows 2000 environment of IBM PC compatible and Add-on card based on the TCP/IP protocol. Advantage of the monitoring system are a personnel expenses curtailment effect, free of the place restriction and unmanned system of the generation plants, etc.