• Title/Summary/Keyword: Network communication area

Search Result 1,318, Processing Time 0.036 seconds

How librarians really use the network for advanced service (정보봉사의 증진을 위한 사서들의 네트워크 이용연구)

  • 한복희
    • Journal of Korean Library and Information Science Society
    • /
    • v.23
    • /
    • pp.1-27
    • /
    • 1995
  • The purpose of this study is twofold: to investigate into general characteristics of the networks in Korea as a new information technology and to discuss general directions of development of the use of the Internet. This study is designed to achieve the purpose by gathering and analysing data related to the use of Internet of librarians those who work in public libraries and research and development libraries and university libraries. The major conclusions made in this study is summarized as follows. (1) From this survey, received detailed response from 69 librarians, the majority (42) from research and development libraries. The majority (56) were from Library and Information Science subject area, half of them (37) hold advanced degrees. (2) Majority (40) have accessed Internet for one year or less, 9(17%) respondents for two years, 17(32%) spend every day Internet related activity. (3) 44.9% of the respondents taught themselves. 28.9% learned informally from a colleague. Formal training from a single one-hour class to more structured learning was available to 30.4%. (4) The most common reason respondents use the Internet are to access remote database searching(73.9%), to communicate with colleagues and friends and electronic mail(52.2%), to transfer files and data exchange(36.2%), to know the current research front(23.2%). They search OPACs for a variety of traditional task-related reasons(59.4%) and to see what other libraries are doing with their automated systems(31.9%). (5) Respondents for the most part use the functions : WWW (68. 1%), E-Mail(59.4%), FTP(52.2%), Gopher(34.8%), Wais(7.2%). (6) Respondents mentioned the following advantages : access to remote log-in database, an excellent and swift communications vehicle, reduced telecommunication cost, saving time. (7) Respondents mentioned the following disadvantages : low speed of communication, difficult of access to the relevant information and library materials, and shortage of database be distributed within Korea.

  • PDF

An Analysis of the Job and Competency of the Healthy Family Supporter as a Middle Manager on the Healthy Family Support Center (건강가정지원센터 중간관리자급 건강가정사의 직무현황과 역량분석)

  • Lee, Yoon-Jung
    • Korean Journal of Human Ecology
    • /
    • v.18 no.4
    • /
    • pp.809-824
    • /
    • 2009
  • The purpose of this study is to examine the contents and concept of program for healthy family and provide job opportunity and competency of healthy family supporter. For this research, participants are 51 healthy family supporters as a middle manager. Data were obtained through the survey using a questionnaire developed by the ministry of women and family and headquarter of healthy family support centers in 2007. The research process consists of two parts. One is to suggest their jobs and requirements, the other is to offer their core competency and area for improvement. First, the jobs of healthy family supporters as a middle manager are the generalization of team's work including the planning, management and coordination, training for the staff, and network of social resources. They recognized the planning and management of healthy family support center's goal and course as a strategic job. The requirements for the performance of their duties are having a bachelor's or a master's degree, career more than for 3 years, and a certificate of qualification of healthy family supporters, social worker and family counselor. Second, their competencies are the understanding of education of family life, theory of family counselling, the planning and valuation of program for healthy family, understanding for the variegated family, management of organization, networking with resources, ability of documentation, ability of persuasion and negotiation, management of time, sociality, communication skill, solving the problem, positiveness, cooperative spirit and so on.

Video Digital Doorlock System for Recognition and Transmission of Approaching Objects (접근객체 인식 및 전송을 위한 영상 디지털 도어락 시스템 설계)

  • Lee, Sang-Rack;Park, Jin-Tae;Woo, Byoung-Hyoun;Choi, Han-Go
    • KIPS Transactions on Software and Data Engineering
    • /
    • v.3 no.6
    • /
    • pp.237-242
    • /
    • 2014
  • Current digital door lock systems are mainly designed for users' convenience, so they have weakness in security. Thus, this paper suggests a video digital doorlock system grouped with a relay device, a server, and a digital doorlock with a camera, sensors, and communication modules, which is detecting or recognizing objects approaching to the front of the door lock system and sending images and door-opening information to users' smart devices. Experiments showed that the suggested system has 96~98% recognition rate of approaching objects and requires 17.1~23.9 seconds for transmission on average, depending on network systems. Therefore, the system is thought to have enough capability for real time security response by monitoring the front area of the doorlock system.

Efficient Counter-Based Broadcast Scheme for High Reachability and Energy Efficiency (높은 접근성과 에너지 효율을 갖는 계수기반 브로드캐스트 기법)

  • Jung, Ji-Young;Seo, Dong-Yoon;Lee, Jung-Ryun
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.41 no.12
    • /
    • pp.1780-1792
    • /
    • 2016
  • In this paper, we propose an efficient counter-based broadcast scheme for high reachability and energy efficiency. To achieve this, we propose a method to calculate additional coverage when a node receives the same broadcast message from both nodes, in order to rebroadcast by a node who can cover an large area. We also propose a formula to determine random access delay (RAD) considering addition coverage, distance, density, and remaining battery information, and a formula to determine count threshold ($C_{th}$) considering density and remaining battery information. In addition, we evaluate the performance of the proposed broadcast scheme compared with the existing counter-based broadcast schemes through simulation.

Development of Automatic Data Transmitting System of Atrial Blood Gas Results via LAN (LAN을 이용한 혈액가스 검사결과 전송시스템)

  • Kim, Nam-Hyun;Huh, Jae-Man;Kim, Ji-Hyue;Kim, Do-Nyun;Kim, Won-Ky;Chang, Byung-Chul
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1992 no.11
    • /
    • pp.103-104
    • /
    • 1992
  • Automatic transmission of data from the blood analyzer to the request site is one of the most important part in hospital computerization. We have developed a system to automatically transmit the data from the atrial blood gas analyzer. In this system, HOST computer, FILE server, LAN(Local Area Network), 3270 Emulator and Multi-port card were integrated. Also, 3 blood gas analyser(NOVA Inc., USA) were connected to a single multi-port card which is attached in a personal computer for data acquisition. When specimen is collected from sampling sites, it is transfered to the lab. After analysis, the result is transmitted to the personal computer via serial communication between machine and multi-port card using interrupt method. Then, the patient's information (Name, Sex, etc.) is obtained from the HOST computer througth the emulator. The combined data(patient information & lab data) is transmitted to the each request site via LAN automatically. From the collected data, patient's previous data could be reviewed, and it could be used for the various statistics and the flow chart for clinical research. Also, we found that this system reduces the personal labor.

  • PDF

Bandwidth Reservation Policy for Cellular Networks Using Geographical Information (지리적 정보를 사용한 셀룰러 네트워크 대역폭 예약 정책)

  • Yu, Jae-Bong;Park, Chan-Young;Park, Joon-Seok
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.31 no.10B
    • /
    • pp.891-899
    • /
    • 2006
  • Generally, a geographical area consists of many regions called cells in wireless networks. Each mobile host(MH) in a cell communicates with a base station(BS) located in the center of the cell. The BSs are connected to each other by a static wired network. Since users are expected to move around during communication sessions, one of the most important QoS factors is related to the handoff. But, the handoff could fail due to unavailability of sufficient bandwidth in the next cell. As the individual cell size gradually shrinks to accommodate increasing the number of MHs, the probability of successful handoffs can be dropped. In this paper, we suppose a bandwidth reservation method to guarantee MHs against connection failure in case of frequent handoffs. This method predicts the mobility based on the geographical information and assigns the bandwidth reservation in proportion to the speed of MHs' motion. As a result, we can expect more exact moving path of MH and to reduce the waste of bandwidth.

Design for seawater reverse osmosis plant using water blending in smart water grid (스마트 워터 그리드 내에서 워터 블렌딩을 고려한 역삼투 해수담수화 플랜트 설계)

  • Lee, Hongju;Park, Hanbai;Woo, Dal-Sik;Kim, Suhan
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.29 no.1
    • /
    • pp.89-96
    • /
    • 2015
  • Smart water grid is a water network with communication to save water and energy using various water resources. In smart water grid, water product from the various sources can be blended to be supplied to end-users. The product water blending was reported by literatures while feed water blending has been rarely reported so far. In this work, a commercial reverse osmosis (RO) system design software provided by a membrane manufacturer was used to elucidate the effect of feed water blending on the performance of seawater reverse osmosis (SWRO) plant. Fresh water from exisiting water resource was assumed to be blended to seawater to decrease salt concentration of the RO feed water. The feed water blending can simplify the RO system from double to single pass and decrease seawater intake amount, the unit prices of the RO system components including high pressure pump, and operation risk. Due to the increase in RO plant capacity with the feed water blending, however, the RO membrane area and total power consumption increase at higher water blending rates. Therefore, a specific benefit-cost analysis should be carried out to apply the feed water blending to SWRO plants.

A context-Aware Smart Home Control System based on ZigBee Sensor Network

  • Khan, Murad;Silva, Bhagya Nathali;Jung, Changsu;Han, Kijun
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.11 no.2
    • /
    • pp.1057-1069
    • /
    • 2017
  • The applications of Wireless Sensor Networks (WSN) are progressively adopting for various smart home services such as home automation, controlling smart home household appliances, constrained application services in a smart home, etc. However, enabling a seamless and ubiquitous WSN communication between the smart home appliances is still a challenging job. Therefore, in this paper, we propose a smart home control system using an Actuator based ZigBee networking (AZNET). The working of the proposed system is further divided into three phases, 1) an interference avoidance system is adopted to mitigate the effect of interference caused due to the co-existence of IEEE 802.11x based wireless local area networks (WLAN) and WSN, 2) a sensor-based smart light control system is used to fulfill the light requirement in the smart home using the sunlight with light source, and 3) an autonomous home management system is used to regulate the usage time of the electronic appliances in the smart home. The smart is tested in real time environment to use the sunlight with light sources in a various time of the day. Similarly, the performance of the proposed smart home is verified through simulation using C# programming language. The results and analysis revealed that the proposed smart home is less affected by the interference and efficient in reducing the energy consumption of the appliances available in the smart home scenario.

Performance Analysis of Two-Location Distance-based Registration in Mobile Communication Network (이동통신망에서 이중영역 거리기준 위치등록의 성능 분석)

  • Suh, Jae-Joon;Luo, Yong;Baek, Jang-Hyun
    • Journal of the Korea Society for Simulation
    • /
    • v.17 no.4
    • /
    • pp.41-50
    • /
    • 2008
  • In this study, an improved scheme for distance-based registration (DBR) is proposed and its performance is analyzed. In the DBR, when a mobile station (MS) enters a new cell, it calculates the distance between last registered cell and current cell and registers its location if the distance reaches reference distance D. In this study, two-location DBR (TDBR) is proposed to improve the performance of the DBR. In the TDBR, an MS stores not only last registered location area (LA) but also previously registered LA, and then no registration is needed when the MS crosses two LAs stored already. However, since the TDBR may increase paging cost, trade-off is necessary between decreased registration cost and increased paging cost. In this study, the performances of two schemes are analyzed and compared using 2-dimensional random walk mobility model in hexagonal cell configuration. We show that our mathematical analysis is accurate by comparing with simulation. From the numerical results for various circumstances, it is shown that our proposed TDBR outperforms current DBR in most cases.

  • PDF

Performance Analysis on the Impact of Mutual Interference and the Interference Suppression Method for CBTC System in the Presence of WPAN System (CBTC시스템과 WPAN시스템의 상호간섭영향 및 간섭신호 억제방안에 대한 성능분석)

  • Kim, Seong Cheol
    • Journal of the Korean Society for Railway
    • /
    • v.15 no.5
    • /
    • pp.454-458
    • /
    • 2012
  • The CBTC(Communication based Train Control) and WPAN(Wireless Personal Area Network) systems employed on 2.4GHz ISM band wireless networks provide complementary service within the same environment. Coexistence between the networks will be impaired if the mutual packets are uncertainty associated the timing or gaussian distance. This paper analyzes the impact of the mutual interference and proposed method to minimize the effect of the WPAN system signals on CBTC system. The performance analysis is illustrated by examining the symbol error rate versus signal to noise interference ratio in terms of carrier frequency offset. The method contributes to reduce the symbol error rate drastically. However it can't be a fundamental solution for the impact on the interference problem. It may be needed for railway only frequency after checking the problems of the current railway frequency.