• Title/Summary/Keyword: Exchange & Communication

Search Result 1,198, Processing Time 0.038 seconds

Design of Learning Management System Interconnection Model (학습관리시스템(LMS) 상호 연동 모형의 설계)

  • Nam, Yun-seong;Choi, Hyung Jin;Hyun, eun-mi;Seo, Hyun-suk
    • Proceedings of the Korea Contents Association Conference
    • /
    • 2009.05a
    • /
    • pp.45-50
    • /
    • 2009
  • The educational exchange through e-learning is working very well in such case as develop e-learning, development of various learning tools, cooperative practical use of e-learning contents, etc. However because there were no considerations of LMS(Learning Management System) interconnection when each systems were developed, the exchange through e-learning is starting to raise a problem. Especially the exchange through e-learning between university produced problem for a variety of reasons by absence of direct exchange in every case such as communication of students information, communication of lecture information, etc. Hence in this thesis, I will present designed model about efficient LMS interconnection through analysis case of exchange through e-learning and deduce problem. In the first place I define essential part for study such as lecture establishment data, lecture data, user data, class data, student learning tracking to interconnection data, then constituted data interconnection table used view by data interconnection prcess. By experiment result, the accessibility between students and professors was more convenience, and decreased work process by less data exchange. Henceforth there are researches in development of various essential parts for study, considered security of LMS interconnection.

  • PDF

A Study of Short-term Won/Doller Exchange rate Prediction Model using Hidden Markov Model (은닉마아코프모델을 이용한 단기 원/달러 환율예측 모형 연구)

  • Jeon, Jin-Ho;Kim, Min-Soo
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.12 no.5
    • /
    • pp.229-235
    • /
    • 2012
  • Forex trading participants, due to the intensified economic internationalization exchange risk avoidance measures are needed. In this research, Model suitable for estimation of time-series data, such as stock prices and exchange rates, through the concealment of HMM and estimate the short-term exchange rate forecasting model is applied to the prediction of the future. Estimated by applying the optimal model if the real exchange rate data for a certain period of the future will be able to predict the movement aspect of it. Alleged concealment of HMM. For the estimation of the model to accurately estimate the number of states of the model via Bayesian Information Criterion was confirmed as a model predictive aspect of physical exercise aspect and predict the movement of the two curves were similar.

Mutual Identification and Key Exchange Scheme in Secure Vehicular Communications based on Group Signature (그룹 서명 기반의 차량 네트워크에서 상호 신분 확인 및 세션키 교환 기법)

  • Kim, Dai-Hoon;Choi, Jae-Duck;Jung, Sou-Hwan
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.20 no.1
    • /
    • pp.41-50
    • /
    • 2010
  • This paper proposes a mutual identification and session key exchange scheme in secure vehicular communication based on the group signature. In VANETs, security requirements such as authentication, conditional privacy, non-repudiation, and confidentiality are required to satisfy various vehicular applications. However, existing VANET security methods based on the group signature do not support a mutual identification and session key exchange for data confidentiality. The proposed scheme allows only one credential to authenticate ephemeral Diffie-Hellman parameters generated every key exchange session. Our scheme provides a robust key exchange and reduces storage and communication overhead. The proposed scheme also satisfies security requirements for various application services in VANETs.

Architecture and Call Setup Latency of a Softswitch for VoIP Service (소프트스위치 시스템의 호처리 성능 향상)

  • Kim, Sung-Chul;Yoo, Byun-Hoon;Lee, Byung-Ho
    • Proceedings of the IEEK Conference
    • /
    • 2005.11a
    • /
    • pp.113-118
    • /
    • 2005
  • Softswitch is the core BcN equipment which voice and multimedia switching based on the IP Technologies. It is designed to replace the Class 5(local Exchange) and Class 4(Toll Exchange) switch based on the circuit wired and wireless switching network technologies. Softswitch gets its name because typically it is a software based solution implemented on general purpose computers/servers. While the traditional PSTN switches are rely on dedicated facilities for T and S inter-connection and are designed primarily for voice communications. Packet based Softswitch is divided the control of call and bearer, very different from Public telephone network. Sometimes Call Agent or Media Gateway Controller, a key component in the VoIP solution, is also called Softswitch. This paper will suggest the software architecture of softswitch for performance in call processing part, also suggest the session management model to cover call setup latency.

  • PDF

K-Grid Integrated Data Modeling and Data Exchange Protocol Design and Evaluation (K-Grid 통합 노드 데이터 모델링 및 정보교환 프로토콜 설계와 시험)

  • Choi, Jung-In
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.25 no.12
    • /
    • pp.119-131
    • /
    • 2011
  • To be integrated into the IEC 61970-based K-Grid, application of open communication protocol and sub-system modeling to major nodes is needed. In this paper, a module which links load nodes in customers to CIM based on psXML/oBIX, one of open protocols, was developed and data modeling and communication protocols of IEC 61850-7-42 based DER and ESS which apply the module to the customers who have DER and ESS were designed. Also the XML-based distributed database middleware was designed. The proposed modeling and protocols were applied to the building in which commercial DER products and the effectiveness of the proposed data modeling and the communication protocol were evaluated.

T1 Committee of the TSC Standadization Activity in U.S (미국 TI위원회의 기술표준화 활동에 대한 대응방안)

  • 이동철;김동일
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2000.10a
    • /
    • pp.135-139
    • /
    • 2000
  • The America cognize the necessity to have been agreeded standards that safely guard nation's communication network and maintain inter-connection/operation between users and the public communication provider. The FCC make to review the Electric-Communication Standards through the ECSA(Exchange Carriers Standards Association). This paper studies the research activity of each of the T1 committee section that lead the standards of the America vendors.

  • PDF

Design of B-ISDN Protocol embedded Internet-Phone PBX System (B-ISDN 프로토콜 내장의 인터넷 폰 교환시스템 설계)

  • Choi Jae-Won
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.10 no.5
    • /
    • pp.821-831
    • /
    • 2006
  • In this paper we researched on the development methods and design of the B-ISDN protocol embedded Internet-Phone PBX System for the previous telephone exchange and communication. We designed the structure of the user terminal md exchange server of the Internet-Phone PBX System, defined message and data structure for call control, and designed call control message flows between sender and receiver terminal for user's communication.

State-of-the-art IVEF Service based on e-Navigation System

  • Oyunchimeg, Bayarmaa;Jeong, Jung Sik;Park, Gyei-Kark
    • Journal of the Korean Institute of Intelligent Systems
    • /
    • v.23 no.6
    • /
    • pp.577-582
    • /
    • 2013
  • In this paper, the state-of-the-art IVEF Service based on e-Navigation System was represented. The unification of the data exchange format among maritime-related systems is one of vital user-needs of e-Navigation, advantageous in bringing maritime safety and security. This paper propose the method to exchange marine information in IVEF, as recommended by the IALA, between VTS centers and Korea's GICOMS as well as the government-related agencies. To achieve this, a system data flow was designed which it acts as client and server. It enables the sending and receiving of Radar and CCTV images in accordance with the IVEF recommendation document of IALA.

Development of the Gateway in IEC61850 based Substation for Smart Grid (스마트 그리드용 IEC61850 기반 변전소에서의 게이트웨이 개발)

  • Yun, Seok-Yeul
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.60 no.7
    • /
    • pp.1324-1330
    • /
    • 2011
  • This paper presents the development of gateway for smart grid for the interoperable communication between IEC 61850 station leveled devices and one of legacy Modbus, DNP3, and IEC60870-5-101/104/103 communication protocol devices of bay level in substation or for the exchange of information between IEC 61850 substation and SCADA control center. The data-mapping model is designed for the exchange of information and the gateway configuration tool is developed for generating meta-data based on XML Schema. this paper is mostly concerned with the design and realization of gateway system for the interoperable data communication between a legacy protocol device and IEC61850 based devices or systems.

ID-based group key exchange mechanism for virtual group with microservice

  • Kim, Hyun-Jin;Park, Pyung-Koo;Ryou, Jae-Cheol
    • ETRI Journal
    • /
    • v.43 no.5
    • /
    • pp.932-940
    • /
    • 2021
  • Currently, research on network functions virtualization focuses on using microservices in cloud environments. Previous studies primarily focused on communication between nodes in physical infrastructure. Until now, there is no sufficient research on group key management in virtual environments. The service is composed of microservices that change dynamically according to the virtual service. There are dependencies for microservices on changing the group membership of the service. There is also a high possibility that various security threats, such as data leakage, communication surveillance, and privacy exposure, may occur in interactive communication with microservices. In this study, we propose an ID-based group key exchange (idGKE) mechanism between microservices as one group. idGKE defines the microservices' schemes: group key gen, join group, leave group, and multiple group join. We experiment in a real environment to evaluate the performance of the proposed mechanism. The proposed mechanism ensures an essential requirement for group key management such as secrecy, sustainability, and performance, improving virtual environment security.