• 산업기술연구
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• 제30권B호
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• pp.55-59
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• 2010

The number of elderly people living alone increases with the trend of nuclear family in recent aging society and advances of health and medical technologies, where the safety of the elderly people becomes a big social issue. One of the safety system for them these days is that security guards regularly visit homes of the elderly living alone to check their safety. However, it is an inefficient system since it costs a great deal. So, a new efficient system with low cost using modern advanced technologies needs to be developed. In this paper, we implement a monitoring system for elderly living alone using ubiquitous sensor and zigbeX. The system can remotely determine the health status of elderly people and report to their hospitals. Since the system can be implemented with low cost and do the same job as security guards do, we expect that it should replace the existing expensive monitoring system.

• Smart Structures and Systems
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• 제5권2호
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• pp.173-191
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• 2009

Civil infrastructures are always subjected to various types of hazard and deterioration. These conditions require systematic efforts to assess the exposure and vulnerability of infrastructure, as well as producing strategic countermeasures to reduce the risks. This paper describes the needs for and concept of advanced sensor technologies for risk assessment of civil infrastructure in Japan. Backgrounds of the infrastructure problems such as natural disasters, difficult environment, limited resource for maintenance, and increasing requirement for safety are discussed. The paper presents a concept of risk assessment, which is defined as a combination of hazard and structural vulnerability assessment. An overview of current practices and research activities toward implementing the concept is presented. This includes implementation of structural health monitoring (SHM) systems for environment and natural disaster prevention, improvement of stock management, and prevention of structural failure.

• 한국통신학회논문지
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• 제35권1B호
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• pp.53-61
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• 2010

사물통신은 다양한 네트워크와 기기가 결합하여 복합적인 서비스를 제공하는 미래의 통신망 기술로 복합적인 서비스를 제공하기 위하여 센서 시스템들 사이에 표준화된 정보 교환 기술이 필요하다. 본 연구에서는 센서 시스템이 가지는 특징을 반영하여 응용 시스템 사이에 데이터 추상화와 상호운용성을 지원하는 메시지 프로토콜을 개발하였으며, 이는 데이터 표현 형식과 데이터 교환 함수로 구성된다.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.17-24
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• 2016

In this paper, we introduce indoor localization technologies categorizing them into ON/OFF switch and senor based, wireless communication based, and image based technologies. Then we describe several representative techniques for each of them, emphasizing their strengths and weaknesses. We define important performance issues for indoor localization technologies and analyze recent technologies according to the performance issues. Our analyses show that ON/OFF switch based technologies are difficult to install, but accurate and not limited by light. Wireless communication technologies are not limited by light nor distance (space) and do not need additional device. Image based technologies do not need additional device but are limited by light, and their accuracies are affected by light. We believe that this paper provide wise view and necessary information for recent indoor localization technologies.

• 센서학회지
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• 제26권6호
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• pp.391-396
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• 2017

Human body motion detection is important in several industry sectors, such as entertainment, healthcare, rehabilitation, and so on. In this paper, we first discuss commercial human motion detection technologies (optical markers, MEMS acceleration sensors, infrared imaging, etc.) and then explain recent advances in the development of flexible and stretchable strain sensors for human motion detection. In particular, flexible and stretchable strain sensors that are fabricated using carbon nanotubes, silver nanowires, graphene, and other materials are reviewed.

• 정보통신설비학회논문지
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• 제9권3호
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• pp.86-91
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• 2010

In this paper, we introduce UFSN (Underground Facility Sensor Network) in order to build the intelligent management system for the underground facility and drainage in convergence with ubiquitous technologies. and propose the three type of UFSN.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.131-132
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• 2007

In this paper, we designed and implemented bio-signals transmission and storage system using wireless sensor network based on ZigBee. Wireless sensor network is organized with routing protocol based on tree structure. The data is transmitted to monitoring system based on SIP. ZigBee will be used as various combinations with other wireless network technologies for application purposes.

• Journal of Information Processing Systems
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• 제13권5호
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• pp.1259-1276
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• 2017

As technologies related to sensor network are currently emerging and the use of GeoSensor is increasing along with the development of Internet of Things (IoT) technology, spatial query processing systems to efficiently process spatial sensor data are being actively studied. However, existing spatial query processing systems do not support a spatial-temporal data type and a spatial-temporal operator for processing spatialtemporal sensor data. Therefore, they are inadequate for processing spatial-temporal sensor data like GeoSensor. Accordingly, this paper developed a spatial-temporal query processing system, for efficient spatial-temporal query processing of spatial-temporal sensor data in a sensor network. Lastly, this paper verified the utility of System through a scenario, and proved that this system's performance is better than existing systems through performance assessment of performance time and memory usage.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.207-210
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• 2005

Ubiquitous computing is one of the key technology areas in the "Project on Development of Ubiquitous computing and network technology" promoted by the Ministry of Science and Technology as a frontier business of the $21^{st}$ century in Korea, which is based on the new concept merging physical space and computer-based cyber space. With recent advances in Micro Electro Mechanical System (MEMS) technology, low cost and low-power consumption wireless micro sensor nodes have been available. Using these smart sensor nodes, there are many activities to monitor real world, for example, habitat monitoring, earthquake monitoring and so on. In this paper, we introduce web-based real environment monitoring system incorporating wireless sensor nodes. It collects sensing data produced by some wireless sensor nodes and stores them into a database system to analyze. Our environment monitoring system is composed of a networked camera and environmental sensor nodes, which are called Mica2 and developed by University of California at Berkeley. We have modified and ported network protocols over TinyOS and developed a monitoring application program using the MTS310 and MTS420 sensors that are able to observe temperature, relative humidity, light and accelerator. The sensed data can be accessed user-friendly because our environment monitoring system supports web-based user interface. Moreover, in this system, we can setup threshold values so the system supports a function to inform some anomalous events to administrators. Especially, the system shows two useful pre-processed data as a kind of practical uses: a discomfort index and a septicity index. To make both index values, the system restores related data from the database system and calculates them according to each equation relatively. We can do enormous works using wireless sensor technologies, but just environment monitoring. In this paper, we show just one of the plentiful applications using sensor technologies.

• 한국산학기술학회논문지
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• 제22권1호
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• pp.294-298
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• 2021

최근 많은 전자 기기들이 무선센서 네트워크 기술들을 접목하면서, 다양한 종류의 센서들이 무선센서 네트워크로 연결하여 사용할 수 있게 되었다. 하지만, 이런 무선센서 네트워크 장비들은 다양한 종류의 네트워크 기술들을 사용하는 데, 각각의 네크워크 기술에 따라 장단점이 존재한다. 따라서 이런 장단점을 잘 고려하여 적용하려는 분야와 목적에 부합할 수 있도록 최적으로 잘 선택하여야 한다. 특히 자기장 관련 센서는 다른 센서들과 달리 복잡한 센서 데이터를 처리함에 있어서, 자기장 센서만의 독특한 특징과 성질이 존재하기 때문에, 개발 초기에 잘 이해한 후에 설계를 하여야 한다. 본 논문에서는 자기장 필드에 발생하는 자기장 센서 데이터의 비선형 데이터를 처리할 수 있는 저가이면서 소형의 웨어 러블 장비를 제안하였다. 또한 무선 센서 네트워크 기술들을 선택하는 방법에 대해서 논의를 하고, 실제 자기장 센서 장치들이 네트워크로 구성하는 방법을 소개하였다. 결론적으로 개발된 웨어러블 자기장 센서장치가 구성하는 무선 센서 토포러지를 제시하고, 이 무선센서 네트워크 망에서 실제 데이터 전송의 성능 및 효능을 보였다.