• 제목/요약/키워드: communication medium

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전력선통신을 위한 고압 배전선로의 방사전계강도 계산 (Calculation of Radiative Electric Field Intensity of Overhead Medium-Voltage Power lines for Power Line Communication)

  • 천동완;박영진;김관호;신철재
    • 한국통신학회논문지
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    • 제30권12A호
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    • pp.1136-1146
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    • 2005
  • 본 논문에서는 전력선 통신을 위해 사용되는 고압 배전선로에서 통신신호 및 잡음신호에 의해 방사되는 방사전계강도를 계산하였다. 전력선 통신 네트워크의 2포트 등가모델 및 기본적인 전송선로 이론을 이용해 입력임피던스를 계산하였다. 그리고 계산된 입력임피던스를 이용해 전력선상 전류를 계산하고 최종적으로 방사전계강도를 계산하였다. 전력선의 특성임피던스가 매우커서 입력 단에서의 반사가 심하기 때문에 입력임피던스는 일정한 주기를 가지는 정재파 형태를 가진다. 계산된 전류 및 방사전계 또한 이러한 형태임을 알 수 있었다. 실제 측정한 결과계산 치와 측정치가 매우 유사함을 알 수 있었다.

공간에서 빛의 유형분류와 특성에 관한 연구 (A Study on the Categorization and Characterization of Light in Space)

  • 신문영;김주연
    • 한국실내디자인학회논문집
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    • 제19권4호
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    • pp.22-30
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    • 2010
  • Light has primary function to enlighten the darkness. However, as development and progresses in media has caused big change in our life, the range of usage and application of light is broadened. And these days, light is actively used as a communication tool in a space. This thesis is based on an idea that a new prospect of light is required and at the same time the theoretical foundation should be established to take active advantage of light. In Chapter two, analysis criteria are established to verify study hypothesis. The applied methodology is to analysis the contents based on literature review. Key words related light in space design are extracted and the frequency of those key words are quantitatively measured. Taking advantage of the result, the characteristics of light are divided into three categories, 'light as symbolic information', 'light as communication medium' and 'light as topological form'. In chapter three, analysis of cases is performed. The cases are selected based on space analyzing criteria established in Chapter two. Qualitative analysis is performed on the cases categorized into natural light and artificial light. Basic analysis elements are evaluated for each case. And each case is allocated to one of three categories, 'light as symbolic information', 'light as communication medium' and 'light as topological form'. Through this analysis, it is found that light in space has prevailing characteristics of 'light as symbolic information' and 'light as communication medium'.

간호⋅간병통합서비스병동 간호사의 조직 내 의사소통과 셀프리더십이 환자안전역량에 미치는 영향: 중소병원을 중심으로 (The Influence of Nurses' Organizational Communication and Self-Leadership on Patient Safety Competence in Comprehensive Nursing Service Units: Focusing on Small and Medium-sized Hospitals)

  • 이규민;지은선
    • 동서간호학연구지
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    • 제27권2호
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    • pp.114-123
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    • 2021
  • Purpose: This study investigated the influence of nurses' organizational communication and self-leadership on patient safety competence in comprehensive nursing care units of small and medium-sized hospitals. Methods: A descriptive design was used and self-reported questionnaires were used to collect data from 165 nurses in Seoul from February to March, 2020. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficient, and multiple linear regression with SPSS/WIN 22.0 program. Results: A mean score of organizational communication was 3.20±0.49, self-leadership 3.58±0.50, and patient safety competency 4.01±0.49 out of 5. A significant positive correlation was found between patient safety competence, organizational communication and self-leadership. Self-leadership and combined ward explained 32% of the variance of patient safety competence (Adjusted R2=.32, p<.001). Conclusion: Patient safety competence in comprehensive nursing care units are associated with self-leadership and organizational communication. Systemic education to improve patient safety competence in small and medium sized hospitals should be implemented to promote organizational communication as well as self-leadership.

Development of a Real-time Communication Service over Random Medium Access Scheme Networks

  • Choo, Young-Yeol;Kwon, Jang-Woo
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.350-353
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    • 2004
  • The increasing use of Ethernet-TCP/IP network in industry has led to the growing interest in its reliability in real-time applications such as automated manufacturing systems and process control systems. However, stochastic behavior of its medium access scheme makes it inadequate for time-critical applications. In order to guarantee hard real-time communication service in Ethernet-TCP/IP network, we proposed an algorithm running over TCP/IP protocol stack without modification of protocols. In this paper, we consider communication services guaranteeing deadlines of periodic real-time messages over MAC protocols that have unbounded medium access time. We propose a centralized token scheduling scheme for multiple access networks. The token is used to allow a station to transmit its message during the time amount that is appended to the token. The real-time performance of the proposed algorithm has been described.

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고압 배전선로 전력선 통신 신호결합장치 개발 (Development of Signal Coupler for Power Line Communication over Medium Voltage Distribution Line)

  • 이재조;박영진;오휘명;김관호;이대영
    • 대한전기학회논문지:시스템및제어부문D
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    • 제54권6호
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    • pp.409-416
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    • 2005
  • For broadband high-data-rate power line communication with the allocated frequency bandwidth from 2 to 30 MHz on medium voltage (MV) distribution power lines, a signal coupling unit is developed. The coupling unit is composed of a coupling capacitor for coupling communication signal, a drain coil, and an impedance matching part. The coupling capacitor made of ceramic capacitor is designed for transmission property of better than 1 dB in the frequency range. The drain coil is used for preventing low frequency high voltage from junction of medium voltage power line in case that a coupling capacitor is not working properly any more. Also, using ferrite core, a novel broadband impedance matching transformer is developed. A complete coupling unit with a coupling capacitor, a drain coil, and a matching transformer is housed by polymer for good isolation and distinguishing from high voltage electric facilities. Each is fabricated and its frequency behavior is tested. Finally, complete signal couplers are equipped in a MV PLC test bed and their performance are measured. The measurement shows that the coupling capacitor works excellently.

PN 시퀀스 방식의 광대역 임펄스 응답 측정을 통한 고압 배전선로 채널 특성 연구 (A Study On The Characteristics Of The Medium Voltage Power Distribution Line Channel By Wideband Channel Impulse Response Measurement Using PN Sequence)

  • 오휘명;최성수;이재조;김관호;황금찬
    • 대한전기학회논문지:시스템및제어부문D
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    • 제54권1호
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    • pp.56-60
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    • 2005
  • In the power-line communication(PLC) systems, the power line is a wired medium. However, the power line channel has the multi-path fading characteristics like the wireless channel in the wireless communication systems because it has the signal reflection and divergence by the impedance mismatching between many branch lines and loads. So the analysis of the multi-path characteristics is very important, and it has been doing by the several measurement methods for the impulse response between the transmitter and the receiver. PN sequence method has originally been used as a wideband impulse response measurement mettled for wireless channel, but it is recently being applied to not only the wireless channel but also the wired channel like the power line channel. This method is more useful and effective for the long distance communication channel like the medium voltage power distribution line with the multi-paths[1]. In this thesis, we have measured impulse response for the medium voltage power distribution line channel by the wideband measurement method using PN sequence, analytically studied the measured data and presented the results.

A Medium Access Control Mechanism for Distributed In-band Full-Duplex Wireless Networks

  • Zuo, Haiwei;Sun, Yanjing;Li, Song;Ni, Qiang;Wang, Xiaolin;Zhang, Xiaoguang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제11권11호
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    • pp.5338-5359
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    • 2017
  • In-band full-duplex (IBFD) wireless communication supports symmetric dual transmission between two nodes and asymmetric dual transmission among three nodes, which allows improved throughput for distributed IBFD wireless networks. However, inter-node interference (INI) can affect desired packet reception in the downlink of three-node topology. The current Half-duplex (HD) medium access control (MAC) mechanism RTS/CTS is unable to establish an asymmetric dual link and consequently to suppress INI. In this paper, we propose a medium access control mechanism for use in distributed IBFD wireless networks, FD-DMAC (Full-Duplex Distributed MAC). In this approach, communication nodes only require single channel access to establish symmetric or asymmetric dual link, and we fully consider the two transmission modes of asymmetric dual link. Through FD-DMAC medium access, the neighbors of communication nodes can clearly know network transmission status, which will provide other opportunities of asymmetric IBFD dual communication and solve hidden node problem. Additionally, we leverage FD-DMAC to transmit received power information. This approach can assist communication nodes to adjust transmit powers and suppress INI. Finally, we give a theoretical analysis of network performance using a discrete-time Markov model. The numerical results show that FD-DMAC achieves a significant improvement over RTS/CTS in terms of throughput and delay.

의사와의 의사소통능력과 소진이 중소병원간호사의 이직의도에 미치는 영향 (Effects of the Communication Ability with Physician and Burnout on Turnover Intention of Nurses in Small-Medium sized Hospitals)

  • 김수진;김세영;김꽃누리
    • 보건의료생명과학 논문지
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    • 제11권1호
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    • pp.115-125
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    • 2023
  • 본 연구는 지방 중소병원 간호사의 의사와의 의사소통능력과 소진이 이직의도에 미치는 영향을 파악하기 위한 서술적 조사연구이다. 자료수집은 지방 중소병원 간호사 135명을 대상으로 이루어졌으며. 수집된 자료는 SPSS 25.0프로그램을 이용하여 빈도분석 및 기술통계, t-test와 One-way ANOVA, Pearson' correlation, multiple regression으로 분석하였다. 연구결과, 평균점수는 간호사의 의사와의 의사소통능력 3.23점, 소진 3.00점, 이직의도 2.79점이었다. 의사소통능력과 소진, 의사소통능력과 이직의도 간에는 음의 상관관계를 보였고, 소진과 이직의도는 양의 상관관계를 보였다. 중소병원 간호사의 이직의도에 영향을 미치는 주요한 예측인자는 소진으로 나타났다. 본 연구는 중소병원 간호사의 이직의도 감소를 위해 간호사의 소진을 줄여나갈 제도적 노력과 업무환경의 변화가 필요함을 보여주었다. 본 연구 결과는 지방 중소병원 간호사의 이직의도를 감소시킬 관리정책 개발을 위한 기초자료를 제공할 수 있다.

비대칭 트래픽 환경에서의 전이중 MAC 프로토콜 (A Full Duplex MAC Protocol of Asymmetric Traffic Environment)

  • 안형태;김치하
    • 정보과학회 컴퓨팅의 실제 논문지
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    • 제22권8호
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    • pp.381-386
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    • 2016
  • 최근 자기간섭제거 기술의 발전으로 무선 네트워크에서 전이중통신이 가능하게 되었다. 전이중통신은 같은 채널에서 동시에 송/수신을 할 수 있기 때문에 차세대 무선통신기술로 주목 받고 있다. 기존 MAC(Medium Access Control) 프로토콜들은 반이중통신을 기반으로 설계되었기 때문에 전이중통신에 적합하지 않다. 따라서 본 논문에서는 전이중 MAC 프로토콜을 설계할 때 고려해야 될 사항에 대해 논의하고, 이를 바탕으로 새로운 전이중 MAC 프로토콜을 제안한다. 시뮬레이션 결과를 통해 제안된 MAC 프로토콜과 기본 전이중통신을 비교하여 성능향상을 확인한다.

Previous Satisfaction and Positive Word-of-Mouth Communication as Antecedents to Purchase Intention in Transmedia Storytelling

  • Park, Bong-Won;Ahn, Jae-Hyeon
    • International Journal of Contents
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    • 제6권4호
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    • pp.90-100
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    • 2010
  • As the reuse of content becomes a strategy for the entertainment industry, managerial insight on customers is needed to be cultivated in order to run a successful business. This study analyzes the impact of previous satisfaction on consumption intention for content in another medium. To do this, two data sets are collected: cases of movie-to-TV series and TV series-to-movie and analyze them using a structural equation modeling approach. The results of our analysis show that satisfied viewers of a movie tend to communicate their positive feelings via word-of-mouth communication and demonstrate repurchase intention of another medium afterward. However, satisfaction does not automatically lead to repurchase intention in another medium. While satisfied viewers of a TV series show a statistically positive repurchase intention for a movie, satisfied viewers of a movie do not show a direct repurchase intention for a TV series. This result demonstrates an asymmetric relationship between satisfaction and repurchase intention across media, and its strategic implications are further discussed.