• The Journal of Bigdata
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• v.6 no.1
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• pp.145-151
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• 2021

In recent years, digital data has been generated in all areas of human activity, and there are many attempts to safely store and process the data to develop useful services. A data lake refers to a data repository that is independent of the source of the data and the analytical framework that leverages the data. In this paper, we designed a tool to safely store various big data generated by smart cities in a data lake and ETL it so that it can be used in services, and a web-based tool necessary to use it effectively. Implement. A series of processes (ETLs) that quality-check and refine source data, store it safely in a data lake, and manage it according to data life cycle policies are often significant for costly infrastructure and development and maintenance. It is a labor-intensive technology. The mounting technology makes it possible to set and execute ETL work monitoring and data life cycle management visually and efficiently without specialized knowledge in the IT field. Separately, a data quality checklist guide is needed to store and use reliable data in the data lake. In addition, it is necessary to set and reserve data migration and deletion cycles using the data life cycle management tool to reduce data management costs.

• Journal of Korea Entertainment Industry Association
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• v.15 no.8
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• pp.423-432
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• 2021

In this study, we investigated and the following conclusions are presented by identifying the current status and problems in order to expand the future's value of the community care project introduced and implemented to improve the quality and care for the elderly's life. First, the needs analysis of the elderly receiving services is composed of patient-centered rather than investigator-centered, and in particular, medical management through medical staff visits should be strengthened, and specialized service items according to gender, age, disability type, and personal preference should be strengthened. This will have to be gradually strengthened. Second, by analyzing the satisfaction, redundancy, and effectiveness of service items, we save money, and consider the consumer-oriented service item composition and application of items necessary for new services. Third, through the introduction of an integrated schedule management system, it is necessary to specialize in pre-booking and visit schedule management between the elderly and the direct service organizations that provide services. Fourth, as an effort to solve the financial problem, it is necessary to prepare a rational resource sharing system with health and medical finance, long-term care insurance system, and social welfare financial project. and it may consider that putting the medical personnel who are from local public medical college input. Through these proposals, the community care business will be able to complete and have future value as a universal aged care system.

• Information and Communications Magazine
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• v.15 no.11
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• pp.124-142
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• 1998

ETSI BRAN (Broadband Radio Access Network)는 고속 무선 LAN 또는 고정 광대역 무선액세스 네트워크에서의 무선 접촉 계층과 ATM 및 IP(Internet Protocol) 코어 네트워크와의 연동을 위한 일부 기능을 표준화하기 위한 과제이다. 특히, BRAN의 HIPERLAN type-2(HIPERLAN/2)의 경우에는 과제의 범위는 무선 접속면, 무선 부시스템에서의 서비스 인터페이스, 서비스 구현에서 요구되는 연동 및 각종 지원 기능을 표준화하며, 무선 접속면의 경우에는 다수 벤더간의 상호 호환성을 제공할 수 있는 인터페이스를 구현하는 것이다. HIPERLAN/2의 기술 규격은 코어 네트워크와 독립적인 물리계층 및 데이터 링크 제어 (DATA Link Control: DLC) 계층과 서로 상이한 코어 네트워크와의 연동을 위한 네트워크 수렴 부계층을 다루게 될 것이며, 초기 단계에서는 ATM과 IP 코어 네트워크와의 연동 기능을 제시하게 될 것이다. 따라서 HIPERLAN/2기반의 시스템 규격을 제시하기 위해서는 네트워크 계층 및 기타 상위 계층에 대한 규격이 요규되며, 이는 ATM Forum에서의 무선 ATM 신호 방식 규격, IETF(Internet Engineering Task Force)의 IP규격, 그리고 ETSI의 SMG (Special Mobile Group) 프로젝트에서 표준화되고 있는 UMTS (Universal Mobile Telecommunication Service) 규격 등과 접목될 것이다. 결과적으로 무선 ATM 관점에서는 완전한 시스템 규격 작성은 ETSI BRAN과 ATM Forum에서 무선 접속 규격과 이동성 관리 및 신호 방식으로 각각 이원화되어 진행되고 있다. 현재 물리 계층에서의 전송 방식은 OFDM(Orthogonal Frequency Division Multiplexing)으로 확정되었으며, DLC 계층에서는 고정 길이의 TDD (Time Division Duplexing) TDMA 프레임 구조를 기반으로 AP (Access Point)에 의해 동적으로 상향 링크 자원을 예약 할당하는 매체 접근 제어 (Medium Access Control: MAC) 프로토콜이 고려되고 있다. 이와 같은 DLC 계층에서는 기본적으로 짧은 길이의 패킷을 통해 다양한 대역폭의 멀티미디어 트래픽을 효율적으로 수용하면서 ATM 네트워크뿐만 아니라 향후 IP 네트워크에서 요구하는 각 서비스별 QoS (Quality of Service)를 개별적으로 보장할 수 있는 기능을 구현하고자 한다. 향후 이 부문에 대한 표준화가 본격적으로 진행될 것으로 예상되며 HIPERLAN/2의 경우에는 1999년 중반까지 1차 기능 규격을 완료할 예정이며, BRAN 전반에 대한 완전한 규격을 2002년까지 완성하는 것을 목표로 하고 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.8
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• pp.679-686
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• 2013

Power efficiency becomes more important in wireless LANs as the mobile stations send more data with limited batteries. It has been known that the IEEE 802.11 PSM is not efficient in high load networks: AP cannot deliver buffered packets to a PS station immediately and it can lead the station to stay in active state quite long and result in energy waste. Moreover, it is inefficient that only one data frame is retrieved by a PS-POLL frame. In this paper, we propose a time slotted scheme to enhance the PSM, in which a mobile station can reserve time slots to receive data frames. Our mechanism can reduce collisions by reservation and decrease the channel occupancy by transmitting multiple data frames via one PS-POLL. The analytic model and simulation results show that proposed scheme reduces power consumption significantly and enhances the performance of PSM.

• The KIPS Transactions:PartC
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• v.11C no.6 s.95
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• pp.815-820
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• 2004

For providing high quality-guaranteed service over Internet, traffic engineering based on an MPLS technology is being introduced. MPLS traffic engineering performs the computation on the path guaranteeing service`s quality and the reservation on network resources by an MPLS signaling protocol. As one of MPLS signaling protocol, RSVP-TE protocol transmits and receives periodic refresh messages for maintaining the path of a traffic flow. Such characteristic gives a heavy processing overhead to routers for maintaining states of large number of paths. In this paper, we propose a scalable implementation approach for RSVP-TE without dramatically increasing processing overhead. And we eval-uate the processing overhead on periodic messages by implementing the RSVP-TE protocol and the reduction mechanism of periodic messages.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.3
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• pp.1-6
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• 2014

Companies almost don't use an integrated control system using expensive network system in multimedia like TV and DID, despite IP-Broadcasting and communication equipment have expanded rapidly. The proposed integrated TCU(terminal control unit) is a control device that supports TV power On/Off check and remote control, power control reservation function, TV channel change, a variety of interface supports of input/output AC power & Lan port, RS-232C and IR using existing IP network after there is installed the Wake-on -Lan in the set-top box. The TCU can control and monitor 24 hours unlike existing low-cost control system RF method. In existing control equipment markets without expandability and low price, the TCU development including 24 hours monitoring and automatic control functions is expected to secure a wide range of companies.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9A
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• pp.1067-1074
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• 2004

In the wireless mobile networks, it IS important to provide the quality-of-service (QoS) guarantees as they are increasingly expected to support the multimedia applications Although the QoS provisioning problem arises in the wire-line networks as well, the mobility of hosts and the scarcity of bandwidth make QoS provisioning a challenging task in wireless mobile networks. The resource allocation to multimedia applications of varying QoS reqUlrement 15 a complex issue. In this paper, we propose a new adaptive resource allocation scheme based on the concept of the resource reservation and the renegotiation in order to guarantee the QoS of the real-tune traffic. The proposed scheme is aimed at improving the perfonnance in terms of the new call blocking rate, the bandoff dropping rate, and the bandwIdth utilization.

• Journal of Digital Contents Society
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• v.18 no.5
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• pp.895-904
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• 2017

In this paper, we propose an IoT based smart outlet system for one-person household with electric safety, electric energy consumption management and transmission of messages to the reserved contacts by connecting the emergency network. The proposed smart outlet system is implemented by parsing packet data and protocol between server, module, application and WiFi AP receiver. The WiFi AP built for communication can be used not only for the outlet but also for the gas barrier, the door lock and the like. In addition, the proposed method can provide the remote monitoring function by receiving the amount of power of the receptacle received through the AC current sensor (SCT-013) in real time. The smart outlet system is expected to be capable of automatically shutting off the power in case of emergency through automatic power use analysis in addition to the standby power cutoff function.

• Proceedings of the Korea Society for Simulation Conference
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• 1994.10a
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• pp.7-8
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• 1994

최근 들어 원자재, 재공품 또는 완제품을 신속하고 정확하게 공급/배분하기 위해 저장과 인출을 담당하는 Material Handling System을 이용하여 작업자의 개입요소를 줄이며, 제고관리 Computer를 이용하여 입고/출고 명령을 유효적절하게 처리하는 ASRS(Atomated Storage and Retreival System : 자동창고 시스템)가 널리 공급되고 있다. 중앙은행의 현금창고, 병원의 약품창고, 식품/화장품 회사의 배송창고, 군수물자의 군납창고에 이르기까지 물품의 저장 또는 공급의 필용성을 갖는 곳에서는 어디든지 찾아볼 수 있는 ASRS는 가깝게는 관공소나 대형빌딩의 주차장에도 이의 개념이 도입되어 사용됨을 볼 수 있다. 최근의 인금인상, 구인난등의 이유로 ASRS설치는 계속 증가할 추세에 있으나 자동 창고 시스템을 설치하기 위해서는 막대한 초기 투자가 필요하며 시스템의 설계 및 설치후 운영에 대한 연구가 반드시 필요하다. ASRS의 운영 Rule 검증, 수행능력 분석등의 목적을 갖는 연구에는 여러 접근방법이 있을 수 있으나 구성 설비와 운영 Rule의 복잡한 관계로 컴퓨터 시뮬레이션의 거의 유일한 문제해결 방법이다. ASRS의 Modeling에 관한 기존의 연구로는 수리모델 수립. 이산사건 시스템의 관점에서 event-graphy, petri-net을 이용한 modeling이 있으며 ASRS에 대한 전용 Simulator 개발등이 진행되었다. 본 연구의 대상 시스템은 2개의 Rack과 하나의 Stacker Crane 으로 구성된 Aisle과 입출고의 물류를 처리하는 순환 RGVS(Rail Guided Vehicle System), 입/출고장을 구성하는 Conveyor Net등으로 이루어진 제조-물류시스템의 일반적인 ASRS이다. 또 이 ASRS의 입/출고 방식은 전수 입/출고만을 포함하며 Blocking 방지를 위한 Capaicty 예약, 다중설비 선택등의 문제등을 고려하고 있다. 본 연구의 접근방법으로는 ASRS의 개념적인 Reference Model을 수립하고 이 Reference Model에 대한 Formal Model로 DEVS(Discrete Event System Specification)을 이용하여 시스템을 Modeling하였다. 이의 Computer Simulation을 위하여 DEVS형식론 환경에서의 Simulation Language인 DEVSim ++ⓒ를 이용하여 시스템을 구현하였다.

• Journal of Information Management
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• v.38 no.4
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• pp.88-118
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• 2007

The purpose of this research is to analyze the problems of regional culture and tourism websites and to seek for the ways to improve those websites since the culture and tourism information websites of local government do not provide enough contents and service. This research is based on following 4 indicators, content evaluation, usability evaluation, design evaluation and interactivity evaluation which are used to evaluate tourism homepages of municipality by Korea Tourism Organization. The result of this research came out with the issue that regional cultural tourism websites lack user-oriented contents. Therefore, regional culture and tourism websites need to provide the custom-made information such as setting a free tourist route, complementing reservation system and diversifying the range of search.