• 한국통신학회논문지
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• 제21권12호
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• pp.3144-3153
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• 1996

ATM switching system is made up of transport network and control newrk according to its functions. The control device, basic part of control network must be developed before developing any other functions, and control device must be stable and need high reliability. Out distributed ATM switching system consists of several ALSs that provides variable local call services, and an ACS that interconnect among several ALSs. Eech ALS has CCCP that takes charage of call and connection control functions, and ACS has an OMP that takes charge of OA&M(Operation, Administration and Maintenance) functios. In this paper, we analyzed the performance evaluation of control device that manipulate subscriber's call based on ITU-T Q.2931 standard protocol messages and Interprocessor communication messages. As a result of simulation when the number of ALS is under 22, as the call arrival rate increase the processor utilization of CCCP increase rapidly than that of OMP. When the number of ALS is incremented to 22, the processor utilization of CCCP is balanced with the of OMP, and when the number of ALS exceeds 22, the processor utiliztion of OMP increase rapidly. Also if messary processing time of OMP is 1.35 times that of CCCP, processor utilizations of CCCP and OMP is equal.

• 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.

• 한국동물위생학회지
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• 제31권1호
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• pp.149-159
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• 2008

A survey was performed to analyse the current animal disease control system by questionnaires. A questionnaire was administered to the livestock-related experts(n = 116) residing in Gyeong-In region and the livestock farmers(n = 108) residing in Incheon from June to July in 2007. The data was analyzed statistically by SPSS 12.0 version. First, the offices related to the animal disease control were dispersed and their cooperation was not effective. Second, the scale of local disease centers was weaker than that of central one in both man-power(eg. veterinarians), budget and so on, and was not enough to control the outbreak of the main animal diseases. Third, there were also insufficient incentives for livestock farmers to report notifiable animal disease. Finally, there was limitation in bury area and incineration facilities. To develop domestic animal industry, control of the disease and rearing of the environmentally friendly livestock farm are the main directions in Gyeong-In region, Production of high quality and safe livestock products is the most important factor to expand the livestock industry. Conclusively, local animal disease center with comparison to central one should be expanded to control the disease and develop the livestock industry in Incheon metropolitan city.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 추계종합학술대회
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• pp.552-555
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• 2001

본 논문에서는 컴퓨터 및 통신분야의 급속한 기술발전으로 마이크로세서의 성능향상과 제어용 LAN(Local Area Network)이 실용화됨으로 시스템 구축에 대한 유연성이 높아져 중앙처리장치(CPU)를 기능별로 분리하고 LAN 통신선로(Dataway)를 이용하여 프로세스의 제어기능은 분산시키고, 정보처리 및 감시와 운전조작기능은 집중화시켜 전체시스템을 구성하므로 신뢰성 향상을 도모하는 분산제어시스템의 개발배경과 적용과정 그리고 제철, 전력, 환경, 수 처리, 석유화학 등의 산업현장에서 다방면에 적용 및 응용되고 있는 분산제어시스템을 고찰하여 보고 향후 분산제어시스템의 발전방향까지 살펴보았다.

• 정보관리학회지
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• 제22권1호
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• pp.229-248
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• 2005

이 연구에서는 접근점제어를 위한 국가적인 협력 모형을 전제로, 자관의 전거레코드를 별도로 구축${\cdot}$운영하면서 서지레코드와 연결하는 방안 대신, 기 구축된 국가 접근점제어 레코드를 자관의 서지레코드와 바로 연계하여 활용할 수 있는 방안을 제시하였다. 이를 위하여 ZING(Z39.50 International: Next Generation)의 SRU(Search and Retrieve URL Service) 프로토콜을 적용하여 클라이언트/서버 시스템을 구축하였다. 이 연구에서 구축한 접근점제어 시스템은 로컬기관 전거제어 시스템 구축에 소요되는 비용과 시간을 절감할 수 있으며, 전거형 선정을 배제한 접근점제어 레코드의 이용, XML 레코드 형식 및 SRU 프로토콜의 도입을 통하여 기존 전거제어 협력 모형에 비해 보다 편리하고 융통성있게 활용될 수 있을 것이다.

• The Korean Journal of Pain
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• 제34권3호
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• pp.304-314
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• 2021

Background: The study investigated virtual reality (VR) immersion in alleviating procedure-related pain in patients with chronic pain undergoing fluoroscopy-guided minimally-invasive intervention in a prone position at an outpatient clinic. Methods: In this prospective randomized controlled study, 38 patients undergoing lumbar sympathetic ganglion block were randomized into either the VR or the control group. In the VR group, procedure-related pain was controlled via infiltration of local anesthetics while watching a 30-minute VR hypnotic program. In the control group, the skin infiltration alone was used, with the VR device switched off. The primary endpoint was an 11-point score on the numerical rating scale, indicating procedure-related pain. Patients' satisfaction with pain control, anxiety levels, the need for additional local anesthetics during the procedure, hemodynamic stability, and any adverse events were assessed. Results: Procedure-related pain was significantly lower in the VR group (3.7 ± 1.4) than in the control group (5.5 ± 1.7; P = 0.002). Post-procedural anxiety was lower in the VR group than in the control group (P = 0.025), with a significant reduction from pre-procedural anxiety (P < 0.001). Although patients' satisfaction did not differ significantly (P = 0.158) between the groups, a higher number of patients required additional local anesthetics in the control group (n = 13) than in the VR group (n = 4; P = 0.001). No severe adverse events occurred in either group during the study. Conclusions: VR immersion can be safely used as a novel adjunct to reduce procedural pain and anxiety during fluoroscopic pain intervention.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1140-1143
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• 1996

A new approach based on artificial potential function is proposed for the obstacle avoidance of redundant manipulators. Unlike the so-called "global" path planning method, which requires expensive computation for the path search before the manipulator starts to move, this new approach, "local" path planning, researches the path in real-time using the local distance information. Previous use of artificial potential function has exhibited local minima in some complex environments. This thesis proposes a potential function that has no local minima even for a cluttered environment. This potential function has been implemented for the collision avoidance of a redundant robot in Simulation. The simulation also employ an algorithm that eliminates collisions with obstacles by calculating the repulsive potential exerted on links, based on the shortest distance to object.

• Carbon letters
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• 제10권3호
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• pp.230-233
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• 2009

In this study, a low temperature growth of high-quality carbon nanotubes on glass substrate using a local surface heating without heating damage to substrate was tried and characterized. The local joule heating was induced to only Ni/Ti metal film on glass substrate by applying voltage to the film. It was estimated that local surface joule heating method could heat the metal surface locally up to around $1200^{\circ}C$ by voltage control. We could successfully obtain high-quality carbon nanotubes grown at $300^{\circ}C$ by applying 125 V for joule heating as same as carbon nanotubes grown at $900^{\circ}C$.

• 대한전기학회논문지:시스템및제어부문D
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• 제51권6호
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• pp.228-234
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• 2002

This paper proposes a real-time application of rationalized Haar transform which is based on the local rationalized Haar transform, local operational matrix and local delay operational matrix. This approach let a general sampling time be used by introducing a scaling factor. In the existing method of orthogonal functions, a major disadvantage is that process signals need to be recorded prior to obtaining their expansions. This paper proposes a novel method of rationalized Haar transform to overcome this shortcoming. And the proposed method is suitable for the analysis of linear systems. The proposed method is expected to the applicable to the adaptive control which demanded to the real-time applications.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 B
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• pp.452-455
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• 1997

It is well known that Variable Structure Controller(VSC) is robust to parameters variation and disturbance but its performance depends on the design parameters such as switching gain and slope of sliding surface. This paper proposes a more robust VSC that is composed of local VSC's. Each local VSC considers the local system dynamics which has narrow parameter variation and disturbance. We optimize the local VSC's by use of Evolution Strategy, and then we use Artificial Neural Network to generalize the local VSC's and construct the overall VSC in order to cover the whole range of parameter variation and disturbance. Simulation on BLDC motor current control has verified the proposed VSC is superior to the conventional VSC.