• 정보처리학회논문지A
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• 제14A권7호
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• pp.399-408
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• 2007

현재 센서 네트워크 응용 분야는 소프트웨어의 효율적 개발을 위한 다양한 연구가 진행되고 있다. 이러한 연구들은 대부분 단일 센서 네트워크 응용 소프트웨어를 쉽고, 빠르게 개발하기 위한 방법에 중점을 두고 있다. 그러나 센서 네트워크 응용 소프트웨어는 운영체제의 핵심 모듈을 기반으로 다양한 종류의 센서 노드들을 제어하는 특징을 가지므로, 다양한 센서 네트워크 어플리케이션의 핵심 공통 기능을 정의하고 특정 센서 네트워크 어플리케이션의 워크플로우에 따라 가변적인 센서 노드들의 다양한 기능을 취사 선택하여 개발하는 방법이 효율적이다. 본 논문에서는 이러한 특성에 따라 소프트웨어 프로덕트 라인 기법을 센서 네트워크 응용 소프트웨어 개발에 적용, 센서 네트워크 응용 소프트웨어 도메인의 공통성을 식별하고 어플리케이션의 가변성에 따라 선택적인 개발을 지원하는 개발 사례를 제시하였다. 제시하는 사례를 통하여 일반적인 비즈니스 도메인과 비교하여 센서 네트워크 응용 도메인의 프로덕트 라인 구축을 위한 특성을 살펴보고, 제시한 가변성 피처 모델과 VEADL을 통하여 설계한 센서 네트워크 응용 도메인의 핵심 자산이 각 노드의 기능에 따라 선택적으로 재사용되는 적용 효율성을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권9호
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• pp.3357-3376
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• 2015

Wireless sensor network is an important research topic that has attracted a lot of attention in recent years. However, most of the interest has focused on wireless sensor network to gather scalar data such as temperature, humidity and vibration. Scalar data are insufficient for diverse applications such as video surveillance, target recognition and traffic monitoring. However, if we use camera sensors in wireless sensor network to collect video data which are vast in information, they can provide important visual information. Video sensor networks continue to gain interest due to their ability to collect video information for a wide range of applications in the past few years. However, how to efficiently store the massive data that reflect environmental state of different times in video sensor network and how to quickly search interested information from them are challenging issues in current research, especially when the sensor network environment is complicated. Therefore, in this paper, we propose a fast algorithm for extracting key frames from video and describe the design and implementation of key frame extraction and sharing in Android for wireless video sensor network.

• Journal of Information Technology Applications and Management
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• 제12권4호
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• pp.13-24
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• 2005

The sensor network is a key component of the ubiquitous computing system which is expected to be widely utilized in logistics control, environment/disaster control, medical/health-care services, digital home and other applications. Nodes in the sensor network are small-sized and exposed to adverse environments. They are demanded to perform their missions with very limited power supply only. Also the sensor network is composed of much more nodes than the wireless ad hoc networks are. In case that some nodes consume up their power capacity, the network topology should change, and rerouting/retransmission is necessitated. Communication protocols studied for conventional wireless networks or ad hoc networks are not suited for the sensor network resultantly. Schemes should be devised to control the efficient usage of node power in the sensor network. This paper proposes a medium access protocol to enhance the efficiency of energy consumption in the sensor network node. Its performance is analyzed by simulation.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.123-126
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• 2005

Wireless Sensor Networks will revolutionize applications such as environmental monitoring, home automation, and logistics. We developed forest fire surveillance system. In this paper, Considering the fact that in Korea, during November to May, forest fires occur very frequently causing catastrophic damages on the valuable environment, Although exists other forest fire surveillance system such as surveillance camera tower, infrared ray sensor system and satellite system. Preexistence surveillance system can't real-time surveillance, monitoring, database and automatic alarm. But, forest fire surveillance system(FFSS) support above. In this paper, we describes a system development approach for a wireless sensor network based FFSS that is to be used to measure temperature and humidity as well as being fitted with a smoke detector. Such a device can be used as an early warning fire detection system and real-time surveillance in the area of a bush fire or endangered public infrastructure. Once the system has being development, a mesh network topology will be implemented with the chosen sensor node with the aim of developing a sophisticated mesh network.

• 정보처리학회논문지A
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• 제16A권2호
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• pp.125-134
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• 2009

본 논문에서는 센서 네트워크의 중단 없이 노드의 응용 소프트웨어에 대한 결함 수정이나 기능 변경 및 개선 등을 효과적으로 관리할 수 있도록 지원하는 버전동기화 기반의 센서 네트워크 응용 소프트웨어 변경 관리 시스템을 제시한다. 응용 소프트웨어 변경 관리 시스템은 응용소프트웨어 개발 환경인 NADE, 노드 관리 서버 및 노드 에이전트로 구성된다. NADE는 노드에 설치할 응용 소프트웨어를 개발하기 위한 Eclipse 기반의 개발환경으로 버전 관리 도구인 CVSNT를 연동하여 응용 소프트웨어에 대한 버전 관리를 수행한다. 노드 관리 서버는 NADE에서 개발한 응용 소프트웨어의 버전과 노드에서 수행되고 있는 응용 소프트웨어의 버전을 비교하여 동기화시킴으로써 노드에서 수행되는 응용 소프트웨어가 항상 최신의 버전으로 유지될 수 있도록 관리하며, 노드 에이전트는 노드에 탑재되어 노드의 정보를 서버에 주기적으로 전송하고, 수정된 노드의 정보를 저장 및 업데이트하는 기능을 수행한다. 제안한 버전동기화 기반의 센서 네트워크 응용 소프트웨어 변경 관리 시스템을 구현하면, 개발자들이 노드의 응용 소프트웨어에 대한 결함을 수정하거나 기능 변경 및 소프트웨어를 개선하여 응용 소프트웨어의 버전이 변경되면 자동으로 센서 노드의 응용 소프트웨어가 업데이트 되므로, 센서 네트워크를 중단하거나 지연시키지 않고 효과적으로 센서 네트워크 시스템의 실행을 관리할 수 있으며, 센서 네트워크 응용 소프트웨어의 변경 관리에 대한 가시성을 향상시킬 수 있을 것으로 기대한다.

• 한국멀티미디어학회논문지
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• 제12권12호
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• pp.1778-1786
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• 2009

Many sensor network applications have been developed for smart home, disaster management, and a wide range of other applications. These applications, however, generally assume a fixed base station as well as fixed sensor nodes. Previous research on sensor networks mainly focused on efficient transmission of data from sensors to fixed sink nodes. Recently there has been active research on mobile sink nodes, sink mobility is one of the most comprehensive trends for information gathering in sensor networks, but the research of an environment where both fixed sink nodes and mobile sinks are present at the same time is rather scarce. This paper proposes a scheme for context-aware by ubiquitous devices with the sink functionality added through fixed sinks under a previously-built, cluster-based multi-hop sensor network environment. To this end, clustering of mobile devices were done based on the fixed sinks of a previously-built sensor network, and by using appropriate fixed sinks, context gathering was made possible. By mathematical comparison with TTDD routing protocol, which was proposed for mobile sinks, it was confirmed that performance increases by average 50% in energy with the number of mobile sinks, and with the number of movements by mobile devices.

• 대한임베디드공학회논문지
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• 제8권6호
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• pp.339-345
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• 2013

This paper addresses the system lifetime maximization algorithm in multi-hop sensor network system. A multi-hop sensor network consists of many battery-driven sensor nodes that collaborate with each other to gather, process, and communicate information using wireless communications. As sensor-driven applications become increasingly integrated into our lives, we propose a energy-aware scheme where each sensor node transmits informative data with adaptive data rate to minimize system energy consumption. We show the optimal data rate to maximize the system lifetime in terms of remaining system energy. Furthermore, the proposed algorithm experimentally shows longer system lifetime in comparison with greedy algorithm.

• Journal of Information Technology Applications and Management
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• 제12권4호
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• pp.93-104
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• 2005

Recently, RFID/USN is one of fundamental technologies in information and communications networks. Low-Rate WPAN, IEEE802.15.4 is a low-cost communication network that allows wireless connectivity in applications with limited Power and relaxed throughput requirements. Its applications are building automation, personal healthcare, industrial control, consumer electronics, and so on. Some applications require location information. Of course location awareness is useful to improve usability of data Low-Rate WPAN Is regarded as a key specification of the sensor network with the characteristics of wireless communication, computing, energy scavenging, self-networking, and etc. Unfortunately ZigBee alliance propose a lot of applications based on location aware technologies, but the specification and low-rate WPAN devices don't support anything about location-based services. RSSI ( Received Signal Strength indication) is for energy detection to associate, channel selection, and etc. RSSI is used to find the location of a potable device in WLAN. In this paper we studied indoor location awareness using vector matching of RSSI in low-Rate wireless PAN. We analyzed the characteristics of RSSI according to distance and experimented location awareness. We implemented sensor nodes with different shapes and configured the sensor network for the location awareness with 4 fixed nodes and a mobile node. We try to contribute developing location awareness method using RSSI in 3-dimension space.

• Journal of Information Technology Applications and Management
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• 제14권2호
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• pp.1-10
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• 2007

The ubiquitous computing system is expected to be widely utilized in digital home, logistics control, environment/disaster management, medical/health-care services and other applications. The ubiquitous sensor network (USN) is a key infra-structure of this system. Nodes in the USN are exposed to adverse environments and required to perform their missions with very limited power supply only. Also the sensor network is composed of much more nodes. In case some node consumes up its power capacity under a certain required level, the network topology should change and re-routing/ re-transmission of data is necessitated. Resultantly communication protocols studied for conventional wireless networks or ad-hoc networks are not suitable for the sensor network. Schemes should be devised to control the efficient usage of node power in the sensor network. This paper proposes a routing algorithm to enhance the efficiency of power consumption for USN node and analyzes its performance by simulation.

• 대한임베디드공학회논문지
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• 제3권1호
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• pp.34-41
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• 2008

There are many researches to build up ubiquitous environment by the Ubiquitous Sensor Network(USN). These applications, such as home network, health care, natural environment and agricultural areas, are implemented by an embedded system. Their fields are gradually spreading. However the power consumption in its implementation plays an important role on the surrounding environment of the wireless network. In this paper, we design low power processor based sensor node platform for agricultural applications. We also compare its some performance with existing products.