• 제어로봇시스템학회논문지
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• 제5권8호
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• pp.961-968
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• 1999

In this paper we handle a system that transform sensor data to sensor information. Sensor informations from redundant accelerometers are manipulated to represent the configuration of objects carrying sensors. Basic sensor unit of the proposed systme is composed of 3 accelerometers that are aligned along x-y-z coordination axes of motion. To refine the sensor information, at first the sensor data are fused by geometrical optimization to reduce the variance of sensor information. To overcome the error caused from inexact alignment of each sensor to the coordination system, we propose a calibration technique that identifies the transformation between the coordinate axes and real sensor axes. The calibration technique make the sensor information approach real value. Also, we propose a technique that decomposes the accelerometer data into motion acceleration component and gravity acceleration component so that we can get more exact configuration of objects than in the case of raw sensor data. A set of experimental results are given to show the usefulness of the proposed method as well as the experiments in which the proposed techniques are applied to human body motion capture.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권5호
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• pp.967-979
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• 2013

Now a day, Wireless Sensor Networks (WSNs) are being widely used in different areas one of which is healthcare services. A wireless medical sensor network senses patient's vital physiological signs through medical sensor-nodes deployed on patient's body area; and transmits these signals to devices of registered medical professionals. These sensor-nodes have low computational power and limited storage capacity. Moreover, the wireless nature of technology attracts malicious minds. Thus, proper user authentication is a prime concern before granting access to patient's sensitive and private data. Recently, P. Kumar et al. claimed to propose a strong authentication protocol for healthcare using Wireless Medical Sensor Networks (WMSN). However, we find that P. Kumar et al.'s scheme is flawed with a number of security pitfalls. Information stored inside smart card, if extracted, is enough to deceive a valid user. Adversary can not only access patient's physiological data on behalf of a valid user without knowing actual password, can also send fake/irrelevant information about patient by playing role of medical sensor-node. Besides, adversary can guess a user's password and is able to compute the session key shared between user and medical sensor-nodes. Thus, the scheme looses message confidentiality. Additionally, the scheme fails to resist insider attack and lacks user anonymity.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제5권2호
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• pp.27-32
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• 2016

개인의 건강 및 상태 정보를 모니터링하기 위한 다양한 센서 기기들이 개발되고 있으며, 스마트폰 상에서 동작하는 응용과 연동을 통해 개인화된 정보를 시각화하여 보여주는 서비스들이 등장하고 있다. 이러한 응용들은 유사한 정보를 사용자에게 제공하면서도 표준화되지 않은 패킷 구조로 인해 센서 기기마다 별도의 응용을 설치해야 하는 문제가 있다. 본 논문에서는 비표준화된 개인용 센서 기기들이 스마트폰과 동적으로 연동될 수 있는 센서 기기 식별 기법을 제안한다. 제안 기법은 센서 기기에 대한 패킷 정보를 서버에 저장하기 때문에 사용하는 센서가 변동되더라도 스마트폰 상에서 동작하는 클라이언트의 변경 없이 응용을 동작할 수 있는 장점이 있다.

• 한국재난정보학회 논문집
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• 제5권2호
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• pp.76-85
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• 2009

SWE(Sensor Web Enablement) is the standard platform of OGC for the sensor data service. SWE is only focusing in the data transmission protocols, but supporting the semantic decision. Sensor data service is the decision service of the status whether is on normal or not. In this study, we study the semantic decision model of the sensor data. It can support the context-aware service based on the decision information.

• 디지털산업정보학회논문지
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• 제7권1호
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• pp.1-9
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• 2011

In this paper, Wireless sensor network technology applied to various greenhouse agro-industry items such as horticulture and local specialty etc., we was constructed automatic control system for optimum growth environment by measuring growth status and environmental change. existing monitoring systems of greenhouse gather information about growth environment depends on the temperature. but in this system, Can be efficient collection and control of information to construct wireless sensor network by growth measurement sensor and environment monitoring sensor inside of the greenhouse. The system is consists of sensor manager for information processing, an environment database that stores information collected from sensors, the GUI of show the greenhouse status, it gather soil and environment information to soil and environment(including weather) sensors, growth measurement sensor. In addition to support that soil information service shows the temperature, moisture, EC, ph of soil to user through the interaction of obtained data and Complex Growth Environment information service for quality and productivity can prevention and response by growth disease or disaster of greenhouse agro-industry items how temperature, humidity, illumination acquiring informationin greenhouse(strawberry, ginseng). To verify the executability of the system, constructing the complex growth environment measurement system using wireless sensor network in greenhouse and we confirmed that it is can provide our optimized growth environment information.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.333-336
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• 2005

The advance of wireless telecommunication and observation technologies leads developing sensor and sensor network for serving the context information continuously. Besides, in order to understand and cope with the context awareness based on the sensor network, it is becoming important issue to deal with plentiful data transmitted from various sensors. Therefore, we propose a context awareness system to deal with the plentiful sensor data in a vast area such as the prevention of a forest fire, the warning system for detecting environmental pollution, and the analysis of the traffic information, etc. The proposed system consists of the context acquisition to collect and store various sensor data, the knowledge base to keep context information and context log, the rule manager to process context information depending on user defined rules, and the situation information manager to analysis and recognize the context, etc. The proposed system is implemented for managing renewable energy data management transmitted from a large scale area.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권5호
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• pp.291-299
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• 2005

An obstacle avoidance algorithm for a network-based autonomous mobile robot is proposed in this paper. The obstacle avoidance algorithm is based on the VFH(Vector Field Histogram) algorithm and two delay compensation methods with the VFH algorithm are proposed for a network-based robot with distributed environmental sensors, mobile actuators, and the VFH controller. Firstly, the environmental sensor information is compensated by prospection with acquired environmental sensor information, measured network delays, and the kinematic model of the robot. The compensated environmental sensor information is used for building polar histogram with the VFH algorithm. Secondly, a sensor fusion algorithm for localization of the robot is proposed to compensate the delay of odometry sensor information and the delay of environmental sensor information. Through some simulation tests, the performance enhancement of the proposed algorithm in the viewpoint of efficient path generation and accurate goal positioning is shown here.

• 대한임베디드공학회논문지
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• 제5권2호
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• pp.46-56
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• 2010

This study proposes a monitoring system by cooperating the image information and the sensor information in a sensor network system. The monitoring system proposed in this study is divided into internal spaces, such as offices and laboratories, and external spaces including other various spaces. In the internal spaces, motions in objects are detected through cameras while some peripherals like lights are controlled by analyzing some temperature, humidity, and illuminance data detected by sensor nodes. In the external spaces, it is to watch certain intruders to the internal spaces through the interested region for exceptional time by installing cameras, motion detectors, and body detectors in such interested regions. In the results of the test that was applied to a practically limited environment by implementing some interfaces for the proposed system, it was considered that it is possible to watch surroundings effectively using the image information obtained from cameras and sensor information acquisited from sensor nodes.

• 인터넷정보학회논문지
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• 제9권1호
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• pp.79-90
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• 2008

실시간적인 데이터의 수집과 더불어 수집한 데이터의 실시간적인 전송을 기반으로 사용자가 센서데이터를 보다 폭넓게 활용할 수 있는 환경을 제공하기 위해 시스템에서 자동적으로 정보를 배포해주는 정보배포 시스템의 필요성이 증대되고 있다. 이러한 요구에 맞추어 본 논문에서는 그리드 환경을 기반으로 센서네트워크에서 유입되는 방대한 양의 데이터를 처리 및 공유하기 위한 정보배포 시스템과 보다 효율적으로 데이터와 사용자의 요구를 매칭하는 방법을 제공하는 CGIM알고리즘을 제안하였다.

• 전자공학회논문지SC
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• 제45권6호
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• pp.82-94
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• 2008

웹 센서는 원격지 사용자에게 측정된 센서 데이터와 관련된 정보를 전송하는데 목적이 있다. 웹 센서는 사용자가 원격지에 존재하기 때문에 센서의 정보를 신뢰 할 수 있어야 하고, 센서들의 진단이 쉽게 다루어져야 한다. 이러한 문제를 해결하기위해 센서를 스마트화시키는 IEEE 1451이 발표되었다. 본 연구에서는 스마트 웹 센서를 제안한다. 제안된 스마트 웹 센서는 IEEE 1451.0을 기반으로, 대부분의 센서 인터페이스에 사용이 가능하고, TEDS 정보를 이용하여 스마트 센서를 구현할 수 있다. 또 한 XML을 이용하여 사용하기 쉬운 웹 서비스로 원격지 사용자가 센서의 모든 정보를 쉽게 다룰 수 있게 한다. 본 연구에서는 스마트 웹 센서를 위한 참조 모델을 제시하고, 가스 센서를 이용한 웹서비스의 구현을 통해 유용함을 증명한다.