• Title/Summary/Keyword: 링크 K

Search Result 1,934, Processing Time 0.028 seconds

A development of the Vehicle-To-Vehicle communication system using the Dedicated Short Range Communication technology (근거리 무선통신 기술 기반 차량간통신 시스템 개발)

  • Rhee Eung-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.43 no.9 s.351
    • /
    • pp.6-13
    • /
    • 2006
  • In this paper, we studied vehicle to vehicle (VTV) communication system using DSRC of 5.8 GHz bands. Nowadays, in the road traffic system is going intelligent and advancing, communication between driving vehicle is very important technology for ITS. We can contrive smoothness and safety traffic flowing by exchanging information about velocity, location, braking and driving condition of nearby vehicles. Therefore, we developed and verified the system which required for the communication among vehicles using DSRC technology of 5.8 GHz band hasa 1 Mbps data rate in the high mobility condition. For this, we developed DSRC modem, data link layer and logic link layer to make it possible that communication between vehicles of perfectly operation, and developed application service program for VTV communication. We performed to communication test in the general road and ascent road. In case of the general mad, obtained VTV communication results are more than number of 17 with in 300 m LOS coverage, and total communication time are $2.34{\sim]18.7$ msec that considered maximum 8-transaction. We blow that obtained results can be used VTV communication or the in areas form the feasibility road test as a function or various conditions. In the future, this system is very useful of advanced safety vehicle (ASV) and super smart vehicle system (SSVS) and so on.

ATM망에서 프레임 릴레이망을 근간으로한 기업통신망의 수용기술

  • Jeong, Jung-Su;Nam, Taek-Yong;Jeong, Tae-Su
    • The Magazine of the IEIE
    • /
    • v.25 no.6
    • /
    • pp.69-78
    • /
    • 1998
  • 프레임 릴레이망을 백본으로 한 LAN과 LAN접속으로 형성되는 기업통신망이 현재 활발히 전개되면서 인터넷을 통한 광고, 전자거래가 중요한 서비스로 진행되고 있다. 국내의 프레임 릴레이 서비스 현황을 살펴보면 KT, 데이콤, 일부기업등에서 프레임 릴레이 교환기를 수입하여 주고객인 기업에 서비스를 제공하고 있다. 이들은 사용자 요구에 의해 주로 LAN과 LAN에 접속된 라우터 등의 종단 시스템간 PVC(영구가상회선: Permanant Virtual Circuit)접속을 통하여 다양한 서비스를 제공하면서 독자적인 기업통신체계를 구축하고 있는 실정이다. 이와같이 사용자 요구로 PVC등록시 프레임 릴레이망과 LAN을 연결하는 링크의 QoS(서비스 질: Quality of Service), 트래픽 파라메터는 수동적으로 설정된다. 현재 국내에서는 프레임 릴레이 교환기 개발은 전무하고 단지 그들을 수입하여 운용하는 수준이며 향후 ATM(비동기 전달모드: Asynchronous Transfer Mode)망의 중요 서비스 연동이 될 프레임 릴레이 기술은 심도있게 연구되고 있다. 향후 고속통신을 제공하는 백본망은 기존의 프레임 릴레이망과 ATM망이 공존할 추세이며 점진적으로 프레임 릴레이망은 사라질 것이다. 이때 ATM 망이 기존의 프레임 릴레이망을 백본으로 한 기업통신망 수용시 원할한 서비스 제공을 위해서는 프레임 릴레이망을 백본으로 채택한 기존의 기업통신망을 ATM망에서 수용시 야기되는 문제점의 제시와 이의 해결은 매우 중요하다고 생각된다. FR/ATM(Frame Relay/ATM)연동시 기업통신망 입장에서는 PVC뿐만 아니라 SVC(교환가상회선: Switched Virtual Circuit)호처리가 수용되어야 한다. 이와같이 PVC와 SVC 수용으로 기업통신망은 통신망의 구성 및 관리가 복잡, 다양해지며, 또 그 기업은 관련된 다양하고 수많은 고객과 접속될 수 있어야 한다. 이때 ATM망을 백본으로 한 공중망이 관련 기업의 사설 정보를 관리하도록 한다는 것은 그 서비스의 이용자에게 보안문제를 제기함은 물론 서비스 이용자가 자신의 망에서 동작하는 여러 서비스를 고객 스스로가 관리하는 것이 바람직하다. CNN(고객망관리 : Customer Network Management)은 이러한 고객에 의한 통신망, 공중망에 대한 부분적 관리 및 서비스에 대한 관리가 이루어 질수 있도록 수행하는 기능이다. 본 논문에서는 ATM망이나 프레임 릴레이망과 ATM 망이 공존시 기업통신망관점에서 야기되는 문제점의 제시와 이의 해결 방안을 살펴보았다. 우선 FR/ATM 연동에서 PVC설정뿐만 아니라 SVC 설정 방법의 연구, 이때 고려된 QoS,트래픽 처리과정을 살펴보았다. 또한 망관리 입장에서 기업통신망 관리자와 ATM망 관리자와의 온-라인 서비스를 제공하기 위해서는 변화된 통신망 차원서의 확장된 Managed Object(MO)를 근간으로한 체계적인 CNN-NMS(CNM-Network management System)연동을 살펴본후 결론에서는 추후 계속연구 및 조사 되어야 할 항목을 기업통신망 입장에서 서술하여 보았다.

  • PDF

The Control System of a Medical Robot Bed for Prevention and Healing of Pressure Ulcer (욕창 예방 및 치유를 위한 의료용 로봇 침대 제어 시스템)

  • Lee, Youngdae;Kim, Changyoung;Chang, Changjun;Kim, Jung Ae;Lim, Jae-Young
    • The Journal of the Convergence on Culture Technology
    • /
    • v.6 no.3
    • /
    • pp.353-359
    • /
    • 2020
  • In this study, the controller structure and control algorithm of medical robot bed developed for pressure ulcer prevention and healing are described. The existing pressure ulcer prevention mattress is operated manually and the remaining maximum body pressure exceeds the pressure of ulcer generation, so there is always room for pressure ulcers. However, the system developed in this study does not generate the pressure ulcers because the body pressure drops to zero when the keyboard of the bed descends using the active electric driving keyboard. In addition, even if the bed is raised and the pressure above the critical body ulcer pressure is abnormal, the device and the control algorithm are designed so that the lasting time is within the pressure ulcer generation critical time and the pressure ulcer itself is not generated. The bed key board motor is a motor designed with the BLDC servos suitable for medical use and these can communicate each other easily through CAN(Car Area Network). The system is new medical robot bed that is effective in preventing pressure ulcers and will be distributed to many patients suffering from pressure ulcers.

A Study on the Defense Geospatial Intelligence Governance - Focusing on the Intelligence Community and LandWarNet (국방지리공간정보 거버넌스에 대한 연구 - 미(美) 정보공동체와 육군 랜드워넷을 중심으로)

  • Kim, Dong Hwan
    • Spatial Information Research
    • /
    • v.22 no.1
    • /
    • pp.19-26
    • /
    • 2014
  • Recently, ICT environments have been increasingly developed and the pattern of the war also has been changed to NCW. The development of communication and network technology, for example, C4I and TDL(Tactical Data Link), has been prosperous and rapid. But the geospatial intelligence field which is the basis of the network frames relatively has not been developed. The purpose of this paper is to foster the geospatial governance in terms of the defense perspective. In order to do that, this paper deals with the U.S. Intelligence Community(IC) and the U.S. Army Global Information Grid(GIG), LandWarNet and those could be good examples of roles and statuses of geospatial intelligence. IC has been produced essential intelligence which is required for policymakers and military leaders. IC has several stove-piped intelligence process systems which have been separately developed and competed. And so as to complete GIG, the U.S. Army adopted LandWarNet. The U.S. Corps of Engineers organized the Army Geospatial Center(AGC) on 1 October 2009 to support LandWarNet. In order to develop NCW, we should recognize geospatial intelligence as the basis of network framework and make a central leading organization of defense geospatial intelligence. The mission of Korea Defense Geospatial-Intelligence Agency should be changed from producing GEOINT to a strategic GEOINT agency. The Army should organize a laboratory of geospatial intelligence field. The mission of producing GEOINT should be transferred to a geospatial intelligence battalion which is newly organized.

Design and Implementation of DNS Name Autoconfiguration for Internet of Things Devices (사물인터넷 디바이스를 위한 DNS 네임 자동설정의 설계 및 구현)

  • Lee, Sejun;Jeong, Jaehoon
    • Journal of KIISE
    • /
    • v.42 no.11
    • /
    • pp.1441-1451
    • /
    • 2015
  • As one of the most spotlighted research areas, these days, the Internet of Things (IoT) aims to provide users with various services through many devices. Since there exist so many devices in IoT environments, it is inefficient to manually configure the domain name system (DNS) names of such devices. Thus, for IPv6-based IoT environments, this paper proposes a scheme called the DNS Name Autoconfiguration (DNSNA) that autoconfigures an IoT device's DNS name and manages it. In the procedure for generating and registering an IoT device's DNS name, the standard protocols of the Internet Engineering Task Force (IETF) are used. Since the proposed scheme resolves an IoT device's DNS name into an IPv6 address in unicast through a DNS server, it generates less traffic than multicast-based mDNS (Multicast DNS) which is a legacy DNS application for the DNS name service in the smart home. Thus, the proposed scheme is more appropriate in multi-hop IoT networks than mDNS. This paper explains the design of the proposed scheme and its service scenarios, such as smart home and smart road. It also explains the implementation and testing of the proposed scheme in the smart grid.

A Security Model Analysis Adopt to Authentication State Information in IPTV Environment (IPTV 환경에서 가입자의 인증 상태정보를 이용한 인증보안 모델 설계)

  • Jeong, Yoon-Su;Jung, Yoon-Sung;Kim, Yong-Tae;Park, Gil-Cheol;Lee, Sang-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.35 no.3B
    • /
    • pp.421-430
    • /
    • 2010
  • Now a days, as a communications network is being broadband, IPTV(Internet Protocol Television) service which provides various two-way TV service is increasing. But as the data which is transmitted between IPTV set-top box and smart card is almost transmitted to set-top box, the illegal user who gets legal authority by approaching to the context of contents illegally using McComac Hack Attack is not prevented perfectly. In this paper, set-top box access security model is proposed which is for the protection from McComac Hack Attack that tries to get permission for access of IPTV service illegally making data line which is connected from smart card to set-top box by using same kind of other set-top box which illegal user uses. The proposed model reports the result of test which tests the user who wants to get permission illegally by registration the information of a condition of smart card which is usable in set-top box in certification server so that it prevents illegal user. Specially, the proposed model strengthen the security about set-top box by adapting public key which is used for establishing neighbor link and inter-certification process though secret value and random number which is created by Pseudo random function.

A Distributed address allocation scheme based on three-dimensional coordinate for efficient routing in WBAN (WBAN 환경에서 효율적인 라우팅을 위한 3차원 좌표 주소할당 기법의 적용)

  • Lee, Jun-Hyuk
    • Journal of Digital Contents Society
    • /
    • v.15 no.6
    • /
    • pp.663-673
    • /
    • 2014
  • The WBAN technology means a short distance wireless network which provides each device interactive communication by connecting devices inside and outside of body. Standardization on the physical layer, data link layer, network layer and application layer is in progress by IEEE 802.15.6 TG BAN. Wireless body area network is usually configured in energy efficient using sensor and zigbee device due to the power limitation and the characteristics of human body. Wireless sensor network consist of sensor field and sink node. Sensor field are composed a lot of sensor node and sink node collect sensing data. Wireless sensor network has capacity of the self constitution by protocol where placed in large area without fixed position. In this paper, we proposed the efficient addressing scheme for improving the performance of routing algorithm by using ZigBee in WBAN environment. A distributed address allocation scheme used an existing algorithm that has wasted in address space. Therefore proposing x, y and z coordinate axes from divided address space of 16 bit to solve this problems. Each node was reduced not only bitwise but also multi hop using the coordinate axes while routing than Cskip algorithm. I compared the performance between the standard and the proposed mechanism through the numerical analysis. Simulation verified performance about decrease averaging multi hop count that compare proposing algorithm and another. The numerical analysis results show that proposed algorithm reduced the multi hop better than ZigBee distributed address assignment

A Study on building the KMS for development of the Leadership - Based on the Power Process Methord - (리더십 향상을 위한 지식경영시스템 구축방안 -POWER PROCESS를 중심으로)

  • Lee Byung-Ku;Lee Kyung-Hwan
    • Proceedings of the Korea Society for Industrial Systems Conference
    • /
    • 2006.05a
    • /
    • pp.351-367
    • /
    • 2006
  • 리더십에 관한 연구는 리더십 특성요인연구, 리더십 contingency 연구, 특성이론적 접근, 행동적 접근, 상황이론적 접근 등이 있으나, 이러한 접근방법이 언제나 긍정적인 리더십을 유발하는 것은 아닌 것으로 나타나고 있다. 따라서, 긍정적이고 일관된 리더십을 만들어 내기 위해서는 리더십에 대한 새로운 접근이 요청된다. 리더십에 대한 연구는 매우 다양하게 나타나고 있으나, 문헌연구에서 볼 때 리더십은 파워라는 공통 요소를 가지고 있다. 파워는 사람으로 하여금 목적지향적인 행동을 유발하는 능력이며, 문헌에 나타난 리더십의 개념은 조직구성원으로 하여금 목적지향적인 행동을 하게하는 능력이다. 따라서, 리더십은 권력의 한 유형으로 볼 수 있다. 그러므로, 본 연구에서는 리더십을 power process에 기초한 권력순환적 관점에서 연구하고자 한다. Power process는 권력요소, 가치, 욕구, 환경, 관계의 다섯 가지 권력결정요소들의 상호작용 과정이다. 이러한 상호작용을 통해서 power process는 권력의 원천을 창출하는데 이 원천에 의한 권력행사는 긍정적인 결과를 유발한다(이경환, 2001). 앞에서 지적한 바와 같이 리더십은 권력의 한 유형이므로, power process에 의한 리더십 행사를 실증연구를 함으로서 지식경영시스템 구축을 위한 요인을 제시하고자 한다. 본 실증적 연구에서 리더는 자신의 권력요소(타고난 능력, 소질, 경험 등=경영자특성)와 욕구, 가치(경영철학) 관계성 및 환경과 같은 파워결정요소(리더십 결정요소)의 상호작용을 통해 자신의 리더십 원천을 창출할 때 즉, power process를 통해 리더십을 행사할 때 이러한 리더십은 경영성과에 긍정적인 결과를 유발하는 것으로 나타났다. 그러므로, 리더십 성과 향상을 위한 지식경영정보시스템은 파워결정요소적 측면에서 고려되어야 할 것이다. 모델과 독립성 모델에서는 시스템 등급에 영향을 준다. 향후에는 더욱 더 다양한 상호의존 모델들이 정량화될 필요성이 있다고 본다. 진행하였다. 줄여서 보다 더 정확하고, 지능적인 규칙구성요소 추출 방법론을 제시하고 구현하여 지식관리자의 규칙습득에 대한 부담을 줄여 주고자 한다. 도움을 받을 수 있게 되었다.을 거치도록 되어있다. 교통주제도는 국가의 교통정책결정과 관련분야의 기초자료로서 다양하게 활용되고 있으며, 특히 ITS 노드/링크 기본지도로 활용되는 등 교통 분야의 중요한 지리정보로서 구축되고 있다..20{\pm}0.37L$, 72시간에 $1.33{\pm}0.33L$로 유의한 차이를 보였으므로(F=6.153, P=0.004), 술 후 폐환기능 회복에 효과가 있다. 4) 실험군과 대조군의 수술 후 노력성 폐활량은 수술 후 72시간에서 실험군이 $1.90{\pm}0.61L$, 대조군이 $1.51{\pm}0.38L$로 유의한 차이를 보였다(t=2.620, P=0.013). 5) 실험군과 대조군의 수술 후 일초 노력성 호기량은 수술 후 24시간에서 $1.33{\pm}0.56L,\;1.00{\ge}0.28L$로 유의한 차이를 보였고(t=2.530, P=0.017), 술 후 72시간에서 $1.72{\pm}0.65L,\;1.33{\pm}0.3L$로 유의한 차이를 보였다(t=2.540, P=0.016). 6) 대상자의 술 후 폐환기능에 영향을 미치는 요인은 성별로 나타났다. 이에 따른 폐환기능의 차이를 보면, 실험군의 술 후 노력성 폐활량이 48시간에 남자($1.78{\pm}0.61L$)가 여자($1.27{\pm}0.45L$)보다 더 높게 나타났으며 (t=2.170, P=0.042),

  • PDF

SNS Mall: A Study on the Analysis of SNS(Social Networking Service) Functions Applicable to Electronic Commerce for Building Regular Relationship with Customers (SNS 몰: 전자상거래에서 적용할 수 있는 SNS의 기능 분석 및 활용에 관한 연구)

  • Gim, Mi-Su;Ra, Young-Gook
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.20 no.5
    • /
    • pp.1-7
    • /
    • 2020
  • We can build regular customer relationships combining SNS (social networking service) with shopping mall like offline trade. A customer who once purchased is registered as reaular and the relationship continues afterward. The registered regular customer get sthe information about objective product shipment and besides it, he contacts with a story of frams, growth of vegetables, sows to harvests. Consumer can purchase with one click necessary foods as he looks at timeline. Sellers give information about news. discounts to customers. Besides it, food storages, recipes can be given to consumers. The good point here is that selling and promoting can be performed within one account. This is better than link is provided for selling an promoting separately. Like this, besides personal connections using SNS, categorization function gives consumers on line shopping mall service. Once the consumer purchase, he is registered as regular. Besides, the consumers who do not know each other, can share information, suggest products, spread the news.

Disturbance Rejection and Attitude Control of the Unmanned Firing System of the Mobile Vehicle (이동형 차량용 무인사격시스템의 외란 제거 및 자세 제어)

  • Chang, Yu-Shin;Keh, Joong-Eup
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.44 no.3
    • /
    • pp.64-69
    • /
    • 2007
  • Motion control of the system is a position control of motor. Motion control of an uncertain robot system is considered as one of the most important and fundamental research directions in the robotics. Some distinguished works using linear control, adaptive control, robust control strategies based on computed torque methodology have been reported. However, it is generally recognized within the control community that these strategies suffer from the following problems : the exact robot dynamics are needed and hard to implement, the adaptive control cannot guarantee the performance during the transient period for adaptation under the variation, the robust control algorithms such as the sliding mode control need information on the bounds of the possible uncertainty and disturbance. And it produces a large control input as well. In this dissertation, a motion control for the unmanned intelligent robot system using disturbance observer is studied. This system is affected with an impact vibration disturbance. This paper describes a stable motion control of the system with the consideration of external disturbance. To obtain the stable motion independently against the external disturbance, the disturbance rejection is strongly required. To address the above issue, this paper presents a Disturbance OBserver(DOB) control algorithm. The validity of the suggested DOB robust control scheme is confirmed by several computer simulation results. And the experiments with a motor system is performed to give the validity of applicability in the industrial field. This results make the easier implementation of the controller possible in the field.