• Title/Summary/Keyword: time-sensitive communication

검색결과 184건 처리시간 0.028초

이질적인 이동성 모델링을 통한 셀룰러 이동통신 시스템의 새로운 성능평가 (A New Approach to Performance Evaluation of Cellular Systems Considering Mixed Platforms Environment)

  • 여건민;류지현;전치혁
    • 대한산업공학회지
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    • 제25권3호
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    • pp.351-359
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    • 1999
  • We present a new approach to the analysis of mobile cellular communication systems under the environment of mixed platforms adopting a guard channel scheme. We assume general cell residence time distributions according to platform-types. Our system model is based on a heterogeneous M/G/c loss system with customer-dependent guard channels, where heterogeneous customers with different service time distributions have different numbers of their own guard channels. We develop the general formula of steady state probabilities for the heterogeneous M/G/c loss system with customer-dependent guard channels. The mean channel occupancy times of new and handoff calls are rigorously derived under a general setting. Finally, our numerical results show that the blocking probability and the forced termination probability are sensitive to the cell residence time distributions.

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Industrial IoT를 위한 5G-TSN 기술 동향 (Research Trend in 5G-TSN for Industrial IoT)

  • 김경수;강유화;김창기
    • 전자통신동향분석
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    • 제35권5호
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    • pp.43-56
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    • 2020
  • The 5G system standardization body has been developing standard functions to provide ultra-high speed, ultra-high reliability, ultra-low latency, and ultra-connected services. In 3GPP Rel-16, which was recently completed, this system has begun to develop ultra-high reliability and ultra-low latency communication functions to support the vertical industry. It is expected that the trend in the adoption of mobile communication by the vertical industry will continue with the introduction of 5G. In this paper, we present the industrial Internet-of-Things (IIoT) service scenarios and requirements for the adoption of 5G systems by the vertical industry and the related standardization trend at present. In particular, we introduce the 5G time-sensitive networking standard technology, a core technology for realizing 5G-based smart factories, for IIoT services.

정보통신 소자 응용을 위한 단결정 실리콘 마이크로 미러 어레이 (Single crystalline silicon micyomirror array for data communication applications)

  • 장윤호;이국녕;김용권
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2003년도 하계학술대회
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    • pp.93-95
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    • 2003
  • We have designed and fabricated a micromirror array using single crystalline silicon (SCS) for data communication applications. The mirror array has $16{\times}16$ micromirrors and each mirror has $120{\mu}m{\times}100{\mu}m$ reflective surface. Electrostatic force was adopted as a driving mechanism. The spring dimensions were determined using relationship between spring dimensions and driving voltage. The designed tilting angle was $9.6^{\circ}$, and measured tilting angle according to applied voltages were experimented. The response time was measured using He-Ne laser and position sensitive diode (PSD), and lifetime was checked for reliability proof.

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고분자의 비파괴 연구를 위한 핵자기 공명 현미영상법 (NMR Microimaging for Noninvasive Investigation of Polymers)

  • 이동훈;고락길;문찬홍;조장희
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1995년도 추계학술대회
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    • pp.253-256
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    • 1995
  • Polymers have been one of the emerging biomedical materials in the area of biomedical research which are applicable to the human body. For human applications, noninvasive characterization of the biomedical polymers has been one of the important topics, and is valuable information. Among others, the swelling rate is one of the important measurements needed for the hydrophilic polymers. NMR imaging has been a suitable method for the noninvasive study of such a material since it is sensitive to many physical and biochemical changes of the specimens. In addition, NMR techniques possess many useful intrinsic properties such as the relaxation and diffusion effects. The present study has provided a noble and noninvasive method of measuring the process of swelling as well as volumetric changes occurred in polymers and drug delivery processes in a drug delivery system (DDS) together with changes of released drug. This gives information, relating with both water ingress process, volumetric changes of polymer specimens and the visualization of sequential drug delivery process. Also, this study provides more reliable method to ascertain the time dependent swelling process compared to the conventional method. The important aspects is that the proposed method is truly noninvasive and is able to ascertain time dependent processes.

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채널화 방식을 이용한 저피탐 도약신호 감지 성능에 관한 연구 (A Study on the Detection Performance of the LPI Hopping Signal using a Channelization Method)

  • 고민호;서유석;김형주;나선필
    • 한국전자통신학회논문지
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    • 제9권6호
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    • pp.733-738
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    • 2014
  • 본 논문은 짧은 감지 시간과 높은 시간 해상도 특성을 갖는 협대역 채널화 라디오미터의 성능을 이론 수식을 이용하여 검증하였다. 모의실험 결과, 채널화 라디오미터는 광대역 라디오미터에 비해 2.5 dB 우수한 감지성능을 나타내었지만 잡음 영향에 민감한 특성을 갖는다는 것을 확인하였다. 또한 협대역 라디오미터의 신호대잡음비는 도약율과 지터 특성 급격한 특성 변화를 갖으며, 두 파라미터에 의해 선형적인 성능 저하를 나타내었다.

가스센서 어레이를 이용한 산림환경 내 치유물질 측정시스템을 통한 자연적 휘발성 유기화합물(NVOCs)과 인위적 휘발성 유기화합물(AVOCs) 분류 (Classification of NOVCs and AVOCS for Healing Substance Measurement System Based on Gas Sensors Array in Forest Environment)

  • 유준부;변형기
    • 센서학회지
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    • 제32권2호
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    • pp.95-99
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    • 2023
  • Forest healing is an activity that enhances immunity and human health using various elements of nature, such as fragrance and scenery. Particularly, phytoncide composed of terpene, a natural volatile substance emitted by forest plants, activates the immune function and is an important raw material in health-related products, such as antibacterial and insect repellents. Moreover, phytoncide is used as a measure to evaluate the impact of the forest atmosphere on the human body. This study aims to implement a highly sensitive gas sensor system that can measure phytoncide in real-time, which is an essential element for realizing a forest healing environment. A gas generation apparatus was implemented by using an adsorption tube in consideration of filed applicability in a laboratory atmosphere to enable the measurement of α-pinene and limonene, which are among the main components of phytoncide. Throughout the experimental trials, the sensitivity of gas sensor arrays to α-pinene and limonene was confirmed. In addition, the classification results demonstrated the AVOCs and NVOCs can be well discriminated using PCA. The primary results confirmed the possibility of developing a high-sensitivity gas sensor system for phytoncide sensing in real time.

실시간 데이터 전송 환경에서의 셀룰러 오토마타 기반의 ROI 이미지 암호 알고리즘 (A ROI Image Encryption Algorithm Based on Cellular Automata in Real-Time Data Transmission Environment)

  • 최언숙
    • 한국전자통신학회논문지
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    • 제18권6호
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    • pp.1117-1124
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    • 2023
  • 이미지 콘텐츠를 포함한 정보의 보안은 오늘날 통신 기술의 필수적인 부분이며 보안 전송에 매우 중요하다. 본 논문에서는 신분증 등 민감한 정보가 포함된 이미지에 대해 실시간 데이터 전송이 필요한 환경에 적합한 보안 수준으로 신속하게 이미지를 암호화할 수 있는 암호화 알고리즘을 제안한다. 제안되는 알고리즘은 하드웨어 구현이 가능하고, 하드웨어 친화적 연산이 가능한 1차원 5-이웃 셀룰러 오토마타를 기반으로 한 알고리즘이다. 제안된 암호 알고리즘에 대하여 다양한 실험과 분석을 수행하여 다양한 무차별 대입 공격으로부터 안전함을 검증한다.

Data Security in Unattended Wireless Sensor Networks through Aggregate Signcryption

  • Babamir, Faezeh Sadat;Eslami, Ziba
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제6권11호
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    • pp.2940-2955
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    • 2012
  • In this paper, we propose aggregate signcryption for achieving data security in UWSNs. The main challenge of these networks established in sensitive environments is offline sink visiting. Moreover, the sensors must retain collected data for long enough time to offload them onto the itinerant sink. Thus, the unattended nature of data collection intervals might offer the adversary the opportunity to apply various attacks without detection. In this paper, employing low order operations (in time and space), we propose a new secure scheme in which various security goals such as confidentiality (through encrypting), authentication and integrity (through signing) are achieved. In addition, the aggregation process of our scheme reduces the space and communication overheads both for sensors and sink, i.e. the proposed technique efficiently enables the sensors and sink to protect, verify and recover all the related data. We further compare our scheme with the best alternative work in the literature.

Coordinating Production Order and Scheduling Policy under Capacity Imbalance

  • Rhee, Seung-Kyu
    • 한국경영과학회지
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    • 제21권2호
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    • pp.171-186
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    • 1996
  • This paper comes from an observation that overemphasis on capacity utilization meausre, which is usual under capacity shortage, can seriously hurt the firm's profit and potential process improvement. We suggest a model that can be used in designing a coordination scheme for decentralized marketing and manufacturing activities. Using a price and time-sensitive demand and capacitated lotsizing model, we derive an effective communication medium betwen marketing and manufacturing. This Balance Indicator of process capacity and flexibility also implies that the increase in capacity availability and setup time reduction should be balanced by its market requirements. This is particularly important when a firm tries to improve its process capability by kaizen. Further, the model can be used to show the comparative performances of scheduling policies under capacity imbalnce. We show the shortening the scheduling cycle can improve the firm profit without changing the simple scheduling rule.

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Metaverse Platform Design for Strengthening Gender Sensitivity of MZ Generation

  • Kim, Sea Woo;Na, Eun Gyung
    • International journal of advanced smart convergence
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    • 제11권3호
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    • pp.79-84
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    • 2022
  • Due to a series of online sex crimes cases and online class conversions caused by the spread of the coronavirus, alternatives to sex education in schools are urgently required. As a result of this study, the metaverse sex education platform was designed. Using this platform, learners are expected to cultivate correct adult awareness and digital citizenship. Within the metaverse platform, learners can participate more actively in learning. Instead of exposing one's name and face in a place dealing with sensitive gender issues, one can participate in education through his or her decorated avatar and participate in education much more actively than face-to-face education and express one's opinion through chat. In addition, education by level can be received regardless of time and place, which can have the effect of bridging the educational gap between urban and rural areas. In this paper, we propose a new sex education platform without time and space constraints by utilizing metaverse.