• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2234-2236
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• 2002

In this paper, realized an automation system that applies the automobile electromotive mirror using CAN(Controller Area Network : ISO l1898). CAN is being used mainly in ECUs (Electronic Control Units) connection of control system or automobile inside. And it has high reliability in the various network protocol. To be realized position system, Automobile Electro mirror, has a strong point that estabilishment e decrease and ease of maintenance it compare PPP(Point-to-point) method of existed. The realization composed of three portions. One Input Slave Con which accept a user's input, another Output Slave Co which drove it makes the motor of electromotive mirr other Master Controller which interfacing the two Controller. Automobile electromotive mirror realized time system that will be able to minize the delay t point of time user's input until output point of time mirror.

• 한국정보처리학회논문지
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• 제7권7호
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• pp.2135-2148
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• 2000

Developing network software in embedded systems, such as digital set-top boxes, requires coding under limited computing resources. This paper presents the porting of Point-to-point Protocol (PPP) software, PPPD, to an embedded system. The PPP is the most popular link layer protocol for the information appliance, to an embedded system. In order to achieve this, problems to be solved for the porting were identified and methods to solve the problems were described. First, PPP source codes were divided into modules. Next, functions of each module were analyzed and interfaces between the modules were delineated. With the analysis results, porting to the embedded system was described. The normal operation of the ported software was verified with the help of a network packet analyzer. Finally, experiences during the porting were presented. The method developed in th paper can be applied to the porting of software to an embedded system as well as the porting of network software.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2000년도 춘계정기학술대회 e-Business를 위한 지능형 정보기술 / 한국지능정보시스템학회
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• pp.235-241
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• 2000

This article suggests integrated neural network models for the interest rate forecasting using change point detection. The basic concept of proposed model is to obtain intervals divided by change point, to identify them as change-point groups, and to involve them in interest rate forecasting. the proposed models consist of three stages. The first stage is to detect successive change points in interest rate dataset. The second stage is to forecast change-point group with data mining classifiers. The final stage is to forecast the desired output with BPN. Based on this structure, we propose three integrated neural network models in terms of data mining classifier: (1) multivariate discriminant analysis (MDA)-supported neural network model, (2) case based reasoning (CBR)-supported neural network model and (3) backpropagation neural networks (BPN)-supported neural network model. Subsequently, we compare these models with a neural networks (BPN)-supported neural network model. Subsequently, we compare these models with a neural network model alone and, in addition, determine which of three classifiers (MDA, CBR and BPN) can perform better. This article is then to examine the predictability of integrated neural network models for interest rate forecasting using change-point detection.

• 대한전기학회논문지:시스템및제어부문D
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• 제53권9호
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• pp.638-643
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• 2004

Middleware enables different networking devices and protocols to inter-operate in ubiquitous home network environments. The UPnP(Universal Plug and Play) middleware, which runs on a PC and is based on the IPv4 protocol, has attracted much interest in the field of home network research since it has versatility The UPnP, however, cannot be easily accessed via the public Internet since the UPnP devices that provide services and the Control Points that control the devices are configured with non-routable local private or Auto IP networks. The critical question is how to access UPnP network via the public Internet. The purpose of this paper is to deal with the non-routability problem in local private and Auto IP networks by improving the conventional Control Point used in UPnP middleware-based home networks. For this purpose, this paper proposes an improved Control Point for accessing and controlling the home network from remote sites via the public Internet, by adding a web server to the conventional Control Point. The improved Control Point is implemented in an embedded GNU/Linux system running on an ARM9 platform. Also this paper implements the security of the home network system based on the UPnP (Universal Plug and Play), adding VPN (Virtual Private Network) router that uses the IPsec to the home network system which is consisted of the ARM9 and the Embedded Linux.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.75-77
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• 1994

This paper presents a method of obtaining transmission network equivalents from the network's driving-point admittance characteristic. Proposed method is based on modal decomposition representation for the large-scale interconnected system. As a result, Norton-type of discrete-time filter model can be generated. It can reproduce the driving-point admittance characteristic of the network. Furthermore proposed model can be implemented into the EMTP in a direct manner. The simulation results with the full system representation and the developed equivalent system showed a good agreement.

• ETRI Journal
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• 제24권4호
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• pp.299-310
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• 2002

This paper describes an integrated network management framework for providing point-to-multipoint reservation service (PMRS) in an ATM network. There are two major issues confronting the network service provider in relation to this service: one is to rapidly confirm the acceptability of the subscriber's reservation at subscription time, and the other is to punctually activate the reserved point-to-multipoint service. To meet these requirements, we developed a service provision model (SPM) and a network resource model of a bandwidth allocation timetable (BATT). We propose a point-to-multipoint routing algorithm composed of ordering and backtracking procedures, which can find the best branch point under the complex network topology and can add more destinations to the existing point-to-multipoint route. We demonstrate the feasibility of the SPM, the BATT, and the point-to-multipoint routing algorithm by implementing our schemes and analyzing their performance under the operational ATM network of KT(Korea Telecom).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.354-356
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• 2006

In this paper, the position control performance of networked control systems is analyzed when time delay through the network is considered. Integrating a control system into a network has great advantages over the traditional control system which uses point to point connection: it allows remarkable reduction in wiring, makes it easy to install and maintain the system, and improves compability. However, a networked control system has the critical defect that network uncertainties, such as time delay, can degrade the control system's performance. Therefore, the major concern of a networked control system is analyzing the effect of network uncertainties. This paper is concerned with PID controller performance for stability region, critical stability region and unstability region under the time delay in the Controller Area Network.

• 정보처리학회논문지A
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• 제11A권3호
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• pp.109-114
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• 2004

최근 무선 랜의 확산과 블루투스 등의 개인 무선 통신의 발전으로 네트워크 환경은 점차 유무선 구분 없이 쉽게 네트워크에 접속할 수 있도록 변화되고 있다. 또한, 가정 내의 노트북, PDA 등의 네트워크 군기의 증가는 초고속 인터넷 라인을 공유하여 이용하고 기기 간에 네트워크를 구성해 작업하는 환경을 필요로 한다. 본 논문에서는 유무선 네트워크에 구분 없이 손쉽게 연결할 수 있고 인터넷에 접속할 수 있는 다중 네트워크 인터페이스를 지원하는 유무선 통합 액세스 포인트를 개발하여 기능을 시험하고 성능을 검증하였다. 각기 다른 네트워크간의 통합을 이루고 성능을 보장하기 위한 시스템 하드웨어 설계, 개발 단계부터 프로토콜 소프트웨어 개발까지 실질적 개발내용을 기술하고, 다양한 형태의 기기를 통한 네트워크 접속 시험을 통해 연동 및 성능에 대한 결과를 보였다.

• 한국항행학회논문지
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• 제28권4호
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• pp.428-435
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• 2024

본 논문에서는 다중 입출력 주파수 변조 연속파 (MIMO FMCW; multiple input multiple output frequency modulation continuous wave) 레이다 기반 HAR (human activity recognition) 시스템의 설계 및 구현 결과를 제시하였다. 다중 입력 다중 출력 레이다 센서를 통한 포인트 클라우드 데이터를 활용하여 HAR 시스템을 구현하면 사생활 보호와 함께, 안전성 및 정확성 측면에서 장점이 있다. 본 논문에서는, MIMO FMCW 레이다 센서로부터의 포인트클라우드 데이터 기반 HAR을 위해 PointPillars와 DS-CNN (depthwise separable convolutional neural network)을 기반으로 최적 경량 네트워크를 개발하였다. 경량화된 네트워크를 통해 고해상도 포인트 클라우드 데이터를 처리하여 높은 인식 정확도와 함께 효율성을 달성하였다. 결과적으로, 98.27%의 정확도와 11.27M Macs (multiply-accumulates) 연산 복잡도로 구현 가능함을 확인하였다. 또한, 개발한 모델을 라즈베리파이(Raspberry-Pi) 시스템에 구현하여 최대 8 fps의 속도로 포인트 클라우드 데이터 처리가 가능함을 확인하였다.

• 한국통신학회논문지
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• 제24권9B호
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• pp.1601-1607
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• 1999

LMDS 시스템은 미리미터파 대역을 통하여 신호를 정송하는 광대역 무선 전송 시스템이다. LMDS 시스템은 크게 하드웨어와 허브를 연결하는 중계망과 허브와 가입자간을 연결하는 분배망으로 구성된다. 본 연구에서는 LMDS 시스템의 백본망으로 활용이 가능한 점대점 중계망 시스템을 구현하였다. STM-1급의 전송신호를 27GHz 대역의 밀리미터파 대역으로 전송하는 시스템을 구현하고 이에 대한 성능을 분석하였다. 시험 결과 밀리미터 대역으로 STM-1을 전송하는 경우 이론적인 계산치에 근사하는 결과를 얻을 수 있었으며, 이 시스템은 LMDS 시스템의 백본망으로 충분히 활용할 수 있음을 증명하였다.