• Title/Summary/Keyword: real events

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Anomaly Detection in Medical Wireless Sensor Networks

  • Salem, Osman;Liu, Yaning;Mehaoua, Ahmed
    • Journal of Computing Science and Engineering
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    • v.7 no.4
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    • pp.272-284
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    • 2013
  • In this paper, we propose a new framework for anomaly detection in medical wireless sensor networks, which are used for remote monitoring of patient vital signs. The proposed framework performs sequential data analysis on a mini gateway used as a base station to detect abnormal changes and to cope with unreliable measurements in collected data without prior knowledge of anomalous events or normal data patterns. The proposed approach is based on the Mahalanobis distance for spatial analysis, and a kernel density estimator for the identification of abnormal temporal patterns. Our main objective is to distinguish between faulty measurements and clinical emergencies in order to reduce false alarms triggered by faulty measurements or ill-behaved sensors. Our experimental results on both real and synthetic medical datasets show that the proposed approach can achieve good detection accuracy with a low false alarm rate (less than 5.5%).

Context-Aware Mobile Gateway Relocation Scheme for Clustered Wireless Sensor Networks

  • Encarnacion, Nico N.;Yang, Hyunho
    • Journal of information and communication convergence engineering
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    • v.10 no.4
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    • pp.365-371
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    • 2012
  • In recent years, researchers have been attracted to clustering methods to improve communication and data transmission in a network. Compared with traditional wireless networks, wireless sensor networks are energy constrained and have lower data rates. The concept of implementing a clustering algorithm in an existing project on gateway relocation is being explored here. Low energy adaptive clustering hierarchy (LEACH) is applied to an existing study on relocating a gateway. The study is further improved by moving the gateway to a specific cluster based on the number or significance of the events detected. The protocol is improved so that each cluster head can communicate with a mobile gateway. The cluster heads are the only nodes that can communicate with the mobile gateway when it (the mobile gateway) is out of the cluster nodes' transmission range. Once the gateway is in range, the nodes will begin their transmission of real-time data. This alleviates the load of the nodes that would be located closest to the gateway if it were static.

GIS Based Realistic Weather Radar Data Visualization Technique

  • Jang, Bong-Joo;Lim, Sanghun
    • Journal of Multimedia Information System
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    • v.4 no.1
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    • pp.1-8
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    • 2017
  • In recent years, the quixotic nature and concentration of rainfall due to global climate change has intensified. To monitor localized heavy rainfalls, a reliable disaster monitoring and warning system with advanced remote observation technology and high-precision display is important. In this paper, we propose a GIS-based intuitive and realistic 3D radar data display technique for accurate and detailed weather analysis. The proposed technique performs 3D object modeling of various radar variables along with ray profiles and then displays stereoscopic radar data on detailed geographical locations. Simulation outcomes show that 3D object modeling of weather radar data can be processed in real time and that changes at each moment of rainfall events can be observed three-dimensionally on GIS.

Development of Alarm Processing Algorithm for SAS (변전소 자동화를 위한 Alarm Processing 방법 개발)

  • Jin, B.G.;Hyun, S.H.;Lee, S.J.
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.161-162
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    • 2006
  • There are many alarms in Substation Automation System because of data types and quantities increasing, so it is very difficult for operators to know the actual situations. In order to help operators easily make decision, some unnecessary alarms should be removed or combined as one. In this paper, alarm processing is using the structure of substation system and the relation of measured data and events to make some rules. Conventional alarm processing just gives data, but proposed alarm processing gives the whole information. In a simulation model system, the data such as voltage, current and CB status are collected by HyperSim and saved in DB, then proposed alarm processing has been testified using those data based on real-time simulation.

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Climate Prediction by a Hybrid Method with Emphasizing Future Precipitation Change of East Asia

  • Lim, Yae-Ji;Jo, Seong-Il;Lee, Jae-Yong;Oh, Hee-Seok;Kang, Hyun-Suk
    • The Korean Journal of Applied Statistics
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    • v.22 no.6
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    • pp.1143-1152
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    • 2009
  • A canonical correlation analysis(CCA)-based method is proposed for prediction of future climate change which combines information from ensembles of atmosphere-ocean general circulation models(AOGCMs) and observed climate values. This paper focuses on predictions of future climate on a regional scale which are of potential economic values. The proposed method is obtained by coupling the classical CCA with empirical orthogonal functions(EOF) for dimension reduction. Furthermore, we generate a distribution of climate responses, so that extreme events as well as a general feature such as long tails and unimodality can be revealed through the distribution. Results from real data examples demonstrate the promising empirical properties of the proposed approaches.

A study on the development of satellite dynamic simulator hardware (위성체 성능 시험 장치 개발에 관한 연구)

  • 용상순;김영학;김진철
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.788-792
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    • 1993
  • The objective of this study is to develope a satellite dynamic simulator, which can test and analyze the performance of spacecraft attitude control, antenna pointing instruments, communication equipments and spacecraft components under the space environment. The satellite simulator can be used to predict the events such as malfunction and failure of satellites in space during operation and can be used to protect against emergencies. At first, the performance test system of attitude control is investigated which can simulate motion and verify stability of spacecraft. Our system consists of an attitude control main processor and a sub-processor including some real hardwares such as attitude sensors and actuators. In this paper, we describe the procedure of designing and manufacturing the dynamic simulator hardware, which consists of the central processor board, the sub-processor board and the sun sensor, and also communication between the components.

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Determination of Effective Prestress of Post-tensioned Precast Bridge Piers (포스트텐션 조립식 교각의 유효프리스트레스 크기 결정)

  • Shim, Chang Su;Koem, Chandara
    • Journal of the Earthquake Engineering Society of Korea
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    • v.20 no.3
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    • pp.135-143
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    • 2016
  • In this paper, a design concept of post-tensioned precast bridge piers was proposed to improve seismic behavior of the bridge pier. Mild reinforcing bars are placed continuously along the height of the column. Prestressing tendons are also provided to obtain re-centering capability for seismic events. Arrangement of the axial steels to prevent buckling of rebars at plastic hinge region was suggested and enhanced seismic performance was verified by experiments. Moment-curvature analyses were performed to evaluate the effect of effective prestress on seismic behavior after verifying the calculation method by cyclic tests of the precast columns. A real bridge pier was designed to investigate the seismic performance according to different level of effective prestress. Level of effective prestress showed obvious effect on crushing displacement but negligible effect on lateral displacement at fracture of tendons and reinforcements.

A study on the classification algorithm in order to information explosion prevention in building security network (빌딩 보안 네트워크상의 정보폭주 방지를 위한 분류 알고리즘에 관한 연구)

  • Kim Kye-Kook;Seo Chang-Ok
    • Journal of the Korea Society of Computer and Information
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    • v.10 no.5 s.37
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    • pp.133-140
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    • 2005
  • The whole network system is paralyzed due to excess event of security server once in a while. If that happens, We have to analyze the cause of events, the time will require when we deal with a matter All the while, ACU(ACCESS CONTROL UNIT) and security server are off, We can not treat about information retrieval of people who come to building with real time. In this paper, we suggested classification algorithm in order to prevent of information explosion.

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Reliability Evaluation of Transmission System using Monte Carlo Simulation Method (Monte Carlo Simulation기법을 이용한 송전계통의 신뢰도 평가)

  • Moon, Seung-Pil;Kim, Hong-Sik;Choi, Jae-Seok;Cha, Jun-Min
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.169-171
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    • 2001
  • This paper presents a method fer evaluation nodal probabilistic congestion and reliability indices of transmission systems using Monte Carlo simulation methods. Quantitative evaluation of transmission system reliability is very important because successful operation of an electric power system. In the deregulated electricity market depends on transmission system reliability management Monte Carlo methods are often preferable, when complex operating conditions are involved and/or the number of sever events is relatively large. To evaluate the reliability of a real power system, Monte Carlo Methods will be more useful. The characteristics and effectiveness of this methodology are illustrated by the case study using a small test system.

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Research for a Emergency Medical Information Transmission System using High-Speed Downlink Packet Access (고속 하향 패킷 접속 통신을 이용한 응급 의료 정보 전송 시스템 구축에 관한 연구)

  • Jung, Jin;You, Jae-Young;Kim, Eong-Seok
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.131-132
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    • 2008
  • It is necessary to develop a high-speed wireless transmission system, which is able to send medical informations to the emergency medical center during emergency patient transportation. In this research, a system which transmits patient’s vital signs and a real-time audio/video contents of the event has been designed, developed, and the suitability of the system has been verified. Test results indicate that the system is capable of transmitting vital signal data, including 17 numeric data, 12 waveforms and 113 events, reading the affected part by forwarding a $320{\times}240$ pixel image at 2fps. Also, the full-duplex voice transmission of the system at 8bit/64kbps is enough to make stable communication between emergency medical technicians and hospital professionals possible. After numerous hours of driving, the packet loss of patient vital signs is 0.013%.

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