• 제목/요약/키워드: User's path

검색결과 301건 처리시간 0.028초

Development of a Guide Robot with Real-Time Linux OS

  • Mun, Jun-Hak;Seo, Gon-Yeon;Kim, Jin-Oh
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2001년도 ICCAS
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    • pp.137.1-137
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    • 2001
  • A new method for a guide robot using Real-Time Linux OS is introduced in this paper. A guide robot is to guide people in museums or buildings. So it has to be more reliable and stable in its control system. In addition, it has to satisfy Real-Time operation requirement because it needs to react to changing environment prompty. The task includes localization, map building, collision avoidance, path planning, and user interface software. The modular guide robot is designed with Real-Time Linux OS, which is composed of many open sources for scheduler, interrupt dispatcher, fifos, shared memory, timer services. We developed application software to satisfy the given task. The developed guide robot moves at 0.2ms and the interrupt latency is less than 100$\mu\textrm{s}$ It is thought that the developed system can be a stable and low cost open architecture robot controller for ...

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마이크로컴퓨터를 이용한 온-라인 측정 시스템의 개발 (Development of microcomputer-based on-line measurement system.)

  • 정명균;이정운
    • 대한기계학회논문집
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    • 제5권4호
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    • pp.274-283
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    • 1981
  • An inexpensive and very simple microcomputer-aided measurement system has been designed for on-line experiments, which perform simultaneously data acquisition, data recorditing, calculations with the data, and positioning of necessary sensors. Interfacting between the microcomputer and the data acquisition board which consists of A/D converter, analog multiplexer, and sample-and-holder, etc. has been done through IEEE-488 interface port and parallel user port both provided by the PET computer's main logic board. Data and control signals are transfered between devices without handshaking. By utilizing BASIC commands PEEK, POKE, SYS, USR which are offered by PET microcomputer, it is possible to link machine code subroutines into the main BASIC program. This facilitates ease of data transfer, programming, and speedy execution of the program. In addition, an X-Y scanning table has been concected to the system in order to automatically position measuring sensors along a pre-determined path of interest.

Network Accessibility and Data Transport Performance of Interworking Mobile Ad Hoc Networks

  • Lee, Kyou-Ho
    • Journal of information and communication convergence engineering
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    • 제7권3호
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    • pp.241-246
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    • 2009
  • Advances in mobile and wireless networking technologies have enabled mobile ad hoc networks applicable to a wide range of areas. Many cases of even such ad hoc networks demand to be accessible to the global network. Owing to be diversified in features depending on applications, however, some those networks may consist of devices or nodes which do not facilitate all the same transport protocols. This results in unreachable situations of establishing ad hoc network: such as non-existence of all required access points, faults or contention in a path of particular protocol communication. Interworking between different transport protocols can alleviate such problems. This paper proposes an interworking scheme to improve data transport performance and network accessibility, especially in such a mobile ad hoc network that is applicable to data communications among ships or user's convenient u-health services. Modeling and simulation analysis are used to verify the improvement.

응용문제에서 보로노이 다이어그램과 파워 다이어그램의 사용성 비교 (Using Voronoi Diagram and Power Diagram in Application Problems)

  • 김동욱
    • 산업경영시스템학회지
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    • 제35권4호
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    • pp.235-243
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    • 2012
  • The Voronoi diagram of spheres and power diagram have been known as powerful tools to analyze spatial characteristics of weighted points, and these structures have variety range of applications including molecular spatial structure analysis, location based optimization, architectural design, etc. Due to the fact that both diagrams are based on different distance metrics, one has better usability than another depending on application problems. In this paper, we compare these diagrams in various situations from the user's viewpoint, and show the Voronoi diagram of spheres is more effective in the problems based on the Euclidean distance metric such as nearest neighbor search, path bottleneck locating, and internal void finding.

간호기록의 개선과 전산화를 위한 기초연구 (A Basie Study on Improvement and Computerization of Nursing Record)

  • 지성애;최경숙;박경숙;정용기
    • 대한간호학회지
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    • 제29권1호
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    • pp.21-33
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    • 1999
  • This study was designed to develop a basic plan for computerization of nursing records. The subjects were 7 nursing record forms, 58 charts, 23 nurses, 2 nurse managers, a nurse and computer specialist, 16 master course students and 3 professors. Data collection was conducted through questionnaire, observation and interview. The collected data were analyzed for problems, plan of improvement and needs for computerization. Based upon these results, it is recommended that nursing record computerization was needed a basic plan to integrate needs of nursing record computerization. The basic plan as fellows : 1. To illustrate a data flow path of nursing record and data dictionary that show nurse's work and record process. 2. To establish a system in order to use multi -tasking and graphic user interface. 3. To establish hardware and software in order to embody integrated management of computer based system through structured walkthrough. 4. To choose effective database management system and to achieve Log as record unit.

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사이버 마아켓에서의 소비자 충동구매성향 분석 (An Analysis of Consumer Instantly Impulse Purchasing Propensity in Cyber Market)

  • 김영숙
    • 대한가정학회지
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    • 제38권12호
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    • pp.111-129
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    • 2000
  • The purpose of this study is to investigate the level of consumer instantly impulse buying in cuber market user. Also this study analyzes causal effect on consumer instantly impulse purchasing by demographic and social, place and promotion, consumer emotion state, and consumer internal and psychological variables. The data had been collected from on-line research method with 1,034, as using cuber market. The major statistical methods used for data analysis are frequency, percentile, mean, factor analysis, multiple regression analysis, Pearson's correlation analysis, and path analysis. The result of causal effect analysis were as follows; First, the variables affecting possession oriented materialism were sex and age. Second, the variables affecting self-control were sex, income, account of credit card, and instantly state of mind. Third, variables directly affecting instantly impulse purchasing were serif employed, banner advertisement, experience of cuber shopping, shopping mall pattern, instantly state of mind, purpose of shopping, happiness and success oriented materialism, and self-control. Also sex, income account of credit card, and instantly state of mind emerge to indirectly effect via self-control. Especially, the variables of success oriented materialism and instantly state of mind influenced on the highest of relative variables in consumer instantly impulse purchasing.

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TDMA 네트워크 전술데이터링크 송수신기 구현 및 성능고찰 (A Performance Study of Tactical Data Link Transceiver in TDMA Networks)

  • 남정호;서난솔;장동운
    • 한국군사과학기술학회지
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    • 제13권3호
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    • pp.388-396
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    • 2010
  • Generally, flight information is transmitted by voice signal over legacy UHF radio in ground to air communication system. In this paper, we have implemented the transceiver of TDL(tactical data link) which transmits tactical information, such as flight information, using digital signal. For transmitting digital information over radio path, we have designed data modem that is processing CPFSK modulation, and TDMA(Time Division Multiple Access) network for Synchronization among multi user(platform). By simulating aeronautical propagation modeling with the environment of Korea terrain, it is predicted the maximum performance of communication range of the transceiver. As result of the transceiver's aviational boarding test, it is proved that the transceiver of TDL over legacy UHF radio transmits and receives the tactical information in TDMA network within communication range of 160km.

위치기반 서비스에서 효율적 검색과 사용자 정보보호를 위한 향상된 그리드 기반 궤적 클로킹 기법 (Enhanced Grid-Based Trajectory Cloaking Method for Efficiency Search and User Information Protection in Location-Based Services)

  • 윤지혜;송두희;채천원;박광진
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제7권8호
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    • pp.195-202
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    • 2018
  • 스마트폰, GPS 네비게이션과 같은 위치 응용프로그램이 발달함에 따라 위치 및 궤적 프라이버시를 보호하기 위한 연구가 활발히 진행되고 있다. 위치 관련 서비스를 제공받기 위해서는 자신의 정확한 위치를 서버에게 공개해야 한다. 그러나 사용자 위치의 공개는 서버에게 자신의 위치뿐만 아니라 궤적까지 노출하게 되어 사생활 침해의 우려가 있다. 또한 사용자가 서버에게 요청한 정보는 위치 정보뿐만 아니라 멀티미디어 정보(위치에 대한 사진, 리뷰 등)를 포함하고 있기 때문에 서버가 처리해야 하는 비용 및 사용자가 받아야하는 정보가 증가하게 된다. 따라서 이를 해결하기 위해 본 논문에서는 EGTC (Enhanced Grid-based Trajectory Cloaking) 기법을 제안한다. EGTC 기법은 기존 GTC (Grid-based Trajectory Cloaking) 기법과 마찬가지로 사용자 궤적을 사용자가 원하는 프라이버시 레벨(UPL: User's desired Privacy Level) 수준으로 그리드를 분할하여 클로킹 영역을 생성 한 후, 랜덤한 질의 순서를 정한다. 다음 단계로 사용자가 이동하고자 하는 경로에 해당하는 서브 그리드 셀을 c(x,y)로 간주해 필요한 정보를 색인으로 구성해 받는다. 제안 기법은 기존 GTC 기법과 같이 궤적 프라이버시를 보장하면서 사용자가 청취해야 하는 정보의 양을 줄였다. 실험 결과를 통하여 제안 기법의 우수성을 증명하였다.

무선 통신을 활용한 경로 단위 네트워크 데이터 업데이트 기법 제안 및 시뮬레이션 (The Proposal and Simulation of Path Unit's Network Data Update Method Using Wireless Network)

  • 가칠오;유기윤;심진범;김형태
    • 대한공간정보학회지
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    • 제16권3호
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    • pp.29-34
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    • 2008
  • 차량용 네비게이션 시스템은 자가 운전 차량의 증가, 여가 문화 확산 등으로 수요가 폭발적으로 증가하고 있으며, 실시간 교통 정보, 디지털 멀티미디어 방송 등의 기능이 융합되면서 텔레매틱스의 가장 중요한 분야로 급성장하고 있다. 이러한 네비게이션 시스템의 다양한 구성 요소 중 네트워크 데이터는 실세계의 도로망을 반영하며, 경로탐색의 기반이 되는 데이터로 가장 핵심 요소라 할 수 있다. 하지만, 현재의 네비게이션 시스템은 stand-alone 형태로 단말기 내의 네트워크 데이터는 자체가 과거의 데이터로 이를 보완하기 위하여 사용자는 주기적으로 업데이트를 수행해야 하는 단점을 가지고 있다. 따라서 본 연구에서는 무선 통신을 활용하여 사용자가 요구하는 경로를 검증하여 항상 최신의 네트워크 데이터를 활용할 수 있는 기법을 제안하고 시뮬레이션을 통하여 제안 기법의 타당성을 검증하였다.

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정보시스템 사용과 성과에 있어서 자발성의 조절효과에 관한 연구 (A Study on the Moderating Effect of Perceived Voluntariness in the Organizational Information System Usage and Performance)

  • 이승창;이호근;정창욱;정남호;서응교
    • Asia pacific journal of information systems
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    • 제19권2호
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    • pp.195-221
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    • 2009
  • According to an industry report, a large number of organizations have invested in Organizational Information System(OIS) in the past few years. Several research results indicate that successful investments in OIS lead to productivity enhancement, while failed ones result in undesirable consequences such as financial losses and dissatisfaction among employees. In spite of huge investments, however, many organizations have failed in achieving the hoped-for returns from OIS. Thus, understanding user acceptance, adoption, and usage of new IS(Information Systems) is an important issue for IS practitioners. Indeed, study of the user acceptance of new information system has been one of the most important research topics in the contemporary IS literature. Several theoretical models are tested to examine 'user acceptance' and 'usage behavior' in IS context. While many research models incorporate 'ease of use' or 'usefulness' as important factors in explaining user acceptance, Technology Acceptance Model(TAM) has been one of the most widely applied models in user acceptance and usage behavior. Even in recent IS studies that employ theories of innovation diffusion in the area of IS implementation, a major focus has been on the user's perception of information technologies. In this research, we study 'voluntariness' as an important factor in IS acceptance by users. Voluntariness is defined as "the degree to which the use of the innovation is perceived as being voluntary, or of free will" When examining the diffusion of accepting OIS, a thoughtful consideration should be given to 'perceived voluntariness.' Current article has following research questions: 1) What models are appropriate to explain the success of OIS? and 2) How does the 'voluntariness' affect the success of OIS? In order to answer these questions, a research model is proposed to describe the detailed nature of association among three independent variables (IT usage level, task interdependency, and organizational support), a mediating variable (IS usage), a dependent variable (perceived performance), and a moderating variable(perceived voluntariness). The central claim of this article is that organizations hardly realize expected returns from OIS investments unless perceived voluntariness is effectively managed after operating OIS. As an example of OIS in this study we have selected the Intranet of Republic of Korea Air Force (ROKAF). ROKAF has implemented the Intranet in an attempt to improve communication and coordination within the organization. To test our research model and hypotheses, survey questionnaires were first sent out to 400 Intranet users. With the assistance of ROKAF, Intranet users were initially identified among its members, and subjects were randomly drawn from the pool. 377 survey responses were finally returned. The unit of measurement and analysis in this research is a personal level. Path analysis based on structural equation modeling was used to test research hypotheses. Construct validity represents accordance between the theoretical base concept of constructs and its measurement items. Tests for the reliability and discriminant validity are accepted, thus verifying our survey instrument. In this research, we have proposed a conceptual framework to highlight the importance of perceived voluntariness after organization deploys OIS. The results of our analysis present several key finding. First, all three independent variables (IT usage level, task interdependency, and organizational support) have significant effects on IS usage, which will eventually improve performance. Thus, IS usage plays a mediating role between antecedent variables (IT usage level. task interdependency, and organizational support) and performance improvement. Second, the effect of the task dependency was the highest for IS usage among the three antecedent variables. This is highly plausible since one of the Intranet's major capabilities is to facilitate communication among members within an organization. Accordingly, we conclude that the higher the task dependency, the higher Intranet usage. The effect of user's IT usage level was the second, while the effect of the organizational support was the third. Finally, the perceived voluntariness plays a pivotal role in enhancing perceived performance in personal level after launching the Intranet. Relationships among investigated variables were significantly different between groups with a high level and a low level of voluntariness. The impact of the Intranet usage on the performance was greater in the higher level voluntariness group than in the lower one. For the lower level voluntariness group, the user's IT usage had the highest effect on the Intranet usage among the three antecedent variables. In short, our study suggests that the higher the perceived voluntariness is the more IS usage will be. Perceived voluntariness was found to have a moderating effect on the relationships among user IT usage level, task interdependency, IS usage, and perceived performance, supporting all the hypotheses on the moderating effect. Most of all, user IT usage level has the strongest influence on IS usage, indicating that users with superior IT usage are more likely to enjoy a high level of perceived performance.