• 제어로봇시스템학회논문지
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• 제10권8호
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• pp.734-741
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• 2004

This paper presents a network based fire detection system using CAN, in order to evaluate feasibility of home automation protocol for smart home. In general, because a traditional fire detection system has an analog transmission method with 4-20mA current, it has several shortcomings such as weakness to noise. Hence, as an alternative to the traditional system, this paper presents the architecture of CAN based fire detection system and the design method of CAN communication network. Also, the performance of the suggested system is evaluated through an experimental testbed. Especially, CAN has several advantages such as low cost and easiness of implementation compared to Ethernet or ARCNET, which are low layer of BACNet. Therefore, if CAN is adopted as low layer of BACNet, the home automation system is implemented more effectively.

• 산업기술연구
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• 제27권B호
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• pp.37-42
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• 2007

A mobile ad hoc network (MANET) is a kind of wireless ad hoc network. It is a self-configuring network of mobile nodes connected by wireless links. Infostation is a lower cost and low power system that provides very high bit rate with limited coverage. In this study, we propose search and rescue system that combines MANET of climbers with Infostations. A climber shares location information of climbers with other climbers while climbing, and delivers the information to Infostations. This system is an intermittent network due to the mobility of nodes. From the system, we can track the locations of missing climbers. Ultimately, proposed system achieves low cost and reduces memory requirement using Infestations. We also analyze the performance of the proposed system by simulation. From the performance analysis results, we expect that the proposed system will be very useful to early detect climbers' locations in emergency situations in Korea mountain areas.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2003년도 춘계학술대회 논문집
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• pp.330-335
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• 2003

This paper deals with the network interface of research and observation instruments in the oceanographic research vessel with an establishment of related database for measured information. The system is implemented to integrated communication network system which allows to effective survey by using real time observation and GUI(Graphic User Interface). The system also consists of the LAN systems and serial interface to link chemical, physical, biological and environmental relations. And, other network service and vessel data service for data communication between vessel and earth station such as INMARSAT-B, WWW service, BBS, E-Mail etc., are needed for integrated communication network system.

• 보건행정학회지
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• 제16권4호
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• pp.68-85
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• 2006

With the competitive environment accelerating in healthcare industry, the hospital network system is considered as one of the strategies for clinical and managerial efficiency. This study was intended to offer a theoretical view on the hospital network system and to analyze the current network status of hospitals in Korea. Specifically, network types were classified based on the criteria modified from previous studies, and were used to describe and compare the scope and intensity of associated activities. The questionnaire survey was conducted with 237 hospitals during the period of December 27 2005 to January 25 2006. Above 90% of tertiary and secondary care hospitals were under the network system, while only 20% of primary care clinics were affiliated. In general, the scope and intensity of network activities was limited. Vertical and/or clinical integration was more common than horizontal and/or managerial integration. Three most frequent types of hospital network systems were clinical-vertical integration (Type A), clinical/managerial-vertical integration(Type B), and clinical/managerial-horizontal /vertical integration (Type C). Such network types differentiated significantly different features of affiliated hospitals and network systems. The affiliation duration to the network system was the only significant factor influencing on the network type. The strategic approach to the network system was emphasized for hospitals to increase the potential advantage of hospital network systems.

• 한국컴퓨터정보학회논문지
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• 제12권2호
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• pp.93-102
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• 2007

방화벽은 네트워크를 보호하기 위한 보안시스템으로 Trusted 네트워크 구축에 있어 필수적인 시스템이라 할 수 있다. 그러나 이러한 방화벽은 비효율적인 정책과 불필요한 트래픽으로 전체 네트워크의 성능을 약 60%이상까지 저하시킨다. 따라서 방화벽의 효율적인 운영과 재배치, 네트워크 성능 개선이 절실히 필요하다. 본 논문에서는 방화벽의 기능에 따른 시뮬레이션 결과를 통해 방화벽의 각 기능이 네트워크 성능에 미치는 영향을 분석하고, 효과적인 네트워크 운용을 위한 Exclusive 방화벽 구축을 제안한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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• pp.115-118
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• 2001

In this paper we propose an FDI(fault detection and isolation) algorithm using neural network-based multi-fault models to detect and isolate single faults in nonlinear systems. When a change in the system occurs, the errors between the system output and the neural network nominal system output cross a threshold, and once a fault in the system is detected, the fault classifier statistically isolates the fault by using the error between each neural network-based fault model output and the system output.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2004년도 하계학술대회
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• pp.31-34
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• 2004

본 논문에서는 현재 위성 DMB 국내 표준으로 채택되어 있는 System E 방식의 Dual Mode 신호 전송에 따른 신호변환시 Time Delay측정 방법에 대해서 제안을 하였다. 제안된 방식의 경우 아날로그 방식이 아닌 디지털 방식으로 정확한 Time Delay 측정이 가능하다. 그리고 위성 DMB Gap Filler System의 입 출력 단자를 통하여 측정이 가능함으로 측정값에 대한 신뢰성 확보가 가능하며 자동측정 방식임으로 측정시 발생될 수 있는 Human Error를 최소화 할 수 있다는 장점을 가지고 있다.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 3부
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• pp.12-18
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• 2008

본 논문은 촉감기반 네트워크 시스템을 위한 적용형 전송기법들에 대한 기존의 연구들을 소개한다. 우선 촉감기반 네트워크 시스템의 구조와 데이터 유행에 따라서 촉감기반 네트워크 시스템을 분류하고 촉감기반 시스템을 위한 네트워크 QoS 요구 조건에 관한 기존의 연구들을 정리한다. 촉감기반 시스템을 위한 기존의 네트워크 적응형 전송기법에 대해서 네트워크 지연 및 지터 보상 기법, 손실 제어, 그리고 전송률 제어 기법들로 나누어 소개한다. 촉감기반 네트워크 시스템을 위한 기존의 연구들을 정리하므로써 더 효율적인 네트워크 적응형 전송 기법들의 개발을 위한 기반을 마련하고자 한다.

• 한국통신학회논문지
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• 제19권3호
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• pp.434-441
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• 1994

본 논문에서는 생산 자동화 네트워크인 MAP에서 네트워크 관리 기능을 실현하기 위해 중용한 변수인 전송 지연과 버퍼크기 그리고 시스템의 안정도등의 트래픽 성능을 분석하였다. 네트워크 관리는 네트워크 상에서 통신이 정상적으로 수행되도록 자원의 제어 및 감독을 담당하는 것으로 네트워크 운영시 필수적으로 요구되는 기능이다. 그러나 MAP 네트워크는 운영시 빠른 응담성을 요구하기 때문에 네트워크 관리 시스템을 구현하여 운영하기 위해서는 네트워크 관리 활동으로 인한 영향을 고려하여야 한다. 네트워크 관리 시스템 동작시 발생하는 불균일한 트래픽을 분석하기 위해, 사이클릭 큐잉 모델을 이용해 해석적 방법과 시뮬레이션을 수행하여 대기 지연 시간과 버퍼 크기를 구했으며, 네트워크 관리 활동에 따른 시스템의 안정도를 분석하였다.

• Geomechanics and Engineering
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• 제13권5호
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• pp.845-860
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• 2017

It is very important to study displacement prediction in geotechnical engineering. Nowadays, the grey system method, time series analysis method and artificial neural network method are three main methods. Based on the brief introduction, the three methods are analyzed comprehensively. Their merits and demerits, applied ranges are revealed. To solve the shortcomings of the artificial neural network method, a new prediction method based on new evolutionary neural network is proposed. Finally, through two real engineering applications, the analysis of three main methods and the new evolutionary neural network method all have been verified. The results show that, the grey system method is a kind of exponential approximation to displacement sequence, and time series analysis is linear autoregression approximation, while artificial neural network is nonlinear autoregression approximation. Thus, the grey system method can suitably analyze the sequence, which has the exponential law, the time series method can suitably analyze the random sequence and the neural network method almostly can be applied in any sequences. Moreover, the prediction results of new evolutionary neural network method is the best, and its approximation sequence and the generalization prediction sequence are all coincided with the real displacement sequence well. Thus, the new evolutionary neural network method is an acceptable method to predict the measurement displacements of geotechnical engineering.