• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.424-427
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• 2010

2006년 서해대교 추돌사고에서 볼 수 있듯이, 장대교량과 같은 대형 구조물의 경우에는 육로와의 접근성 문제 등으로 인하여 보다 철저한 이용자 안전에 대한 대책이 수립되어야 한다. 따라서 본 논문에서는 장대교량을 이용하는 차량과 사람의 안전 확보를 위하여 교량의 노면 상태, 기상 상황, 사고 발생 상황 등과 같은 다양한 위험 정보를 수집 및 전송하여 교량의 안전을 실시간으로 관리 할 수 있는 ISB(Intelligent Safety Bridge) Pole 시스템 개발을 제안하고자 한다. ISB Pole 시스템은 교량 안전을 위하여 가장 우선시되는 u-Safety 센서와 신뢰성 향상을 위하여 이중화 통신구조를 지닌 게이트웨이를 Pole에 설치하여 실시간으로 교량의 교통 상황을 모니터링 한다. 뿐만 아니라, 수집된 정보를 통해 교량 안전관리자가 손쉽게 사고 및 위험에 대응할 수 있도록 교량의 각 구간에 위험지수를 표시할 수 있는 u-Safety 복합안전관리 프로그램을 개발한다. 이와같은 ISB Pole 시스템은 실제 교량에 다양한 현장실험을 진행함으로써 시스템의 안정성을 높이고, 인터페이스를 단일화하여 교량의다른 IT 시설물과도 통합이 가능한 형태로 제작되어 교량의 안전도 향상에 크게 기여할 것이다.

• Agribusiness and Information Management
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• v.7 no.2
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• pp.12-18
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• 2015

Since 2000s, proper utilization of IoT (Internet of Things) technology is a key factor for a firm to become more competitive, and this stream is not exceptional for the food and agriculture industry. Along with this stream, Korea government organization, for example MAFRA (Ministry of Agriculture, Food and Rural Affairs), elected to adopt IoT technology, such as USN and RFID technologies, in the food and agriculture industry. Based on the IoT technology, MAFARA launched six "IoT based farm" project in 2007. IoT based farm project includes IoT based greenhouse system project, and it shows drastic efficiency in terms of cost reduction. When it comes to the productivity, however, the effect of IoT based greenhouse system is still ambiguous. In this regard, this study conducted systems analysis and design for IoT based tomato greenhouse in order to help farmers' decision making related to the productivity by establishing standardized database structure and designing output form to analyze productivity indices. Proposed systems analysis and design can be utilized as a data analysis tools by farmers. Productivity data from the proposed systems is can be used by researchers to identify the relationship among environment, plant growth and productivity. Policy makers also can refer to the data and output forms to predict the quantity of fruit during certain period and to revise production guideline more precisely.

• The Journal of the Korea Contents Association
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• v.7 no.11
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• pp.130-139
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• 2007

As increasing the usefulness of wireless communication, there are developing the environment of ubiquitous that is combined the network of wireless and wire communication combinate type in various filed and in this network environment, u-campus constructions, based on ubiquitous sensor network, is developing. u-Campus is the new type campus which applies to ubiquitous computer technology and wireless network one. at this thesis, it is designed u-campus construction using zigbee technology with u-campus basic technology. u-Campus service, being subject to zigbee wireless communication skills, presents the members an convenient service using zigbee network.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.851-858
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• 2010

Presently, all nations think importantly about an industry and environment. While importance of the environmental field is recognized and the natural environment preservation is importantly regarded, importance of the advanced prevention of the natural disaster and disaster are emphasized. By using the small sensor, the Ubiquitous Sensor Network obtains and processes a neighboring information. And the information is provided through the air interface to the other sensor. Presently, the several kinds of disasters and society safety accident increase around the world. In this paper, the intelligent crisis management strategy and the application field which uses the sensor network technology of the IT based so that nations can go on living safely are inquired.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.11 no.2
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• pp.39-45
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• 2012

In recent years the USN(Ubiquitous Sensor Networks) technology has been applied in the greenhouse in order to control temperature and humidity automatically. In this paper, we proposed a control algorithm using feedback linearization techniques based on a mathematical model for temperature and humidity environment. Especially, Control algorithm is presented to the operation of the ventilator affecting on the temperature and humidity system at the same time. The System has been designed taking into account the disturbance(External temperature, soil temperature, external humidity, solar radiation and wind). In conclusion, I will present a way to control multiple actuator through simulations. The proposed control algorithm is validated using the Matlab/Simulink tools.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.11 no.1
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• pp.1-9
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• 2012

In this paper, we proposed a method of improving the location estimation error existing in RTLS (Real Time Location Service) system for the individual mobility. As ubiquitous age comes, interest for indoor location tracking system is getting more increased. However, existing indoor location tracking system does not correspond actively to frequent changes in indoor environment, and there is a problem that correct location measurement of moving object is difficult due to NLOS (non-line-of-sight) property of indoor environment. Purpose of this paper is to propose an environment accommodation location tracking system that improves the location precision of moving object and grasps location of the object effectively, which is essential an element effectively to provide service and satisfy various users' request.

• Journal of Digital Contents Society
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• v.13 no.1
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• pp.129-139
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• 2012

Recently, the smart sensor technologies are rapidly developing in accordance with the technology of implementation in small-size, low-cost, and low power consumption. With these sensor technologies, especially with MEMS and NEMS, the researches on the WSN are actively performing. For the WSN, a network security function is essential even it requires high physical resource level. But the WSN with the smart sensor technologies could not be provided with enough resources for the function because of limited size, computing-power, low-power, and etc. In this paper, we introduce security and key-management protocols of WSN.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2008.04a
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• pp.608-613
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• 2008

The society increased interest because the scale and size of disaster is getting gradually large. However, urban hazard mitigation management of existing system had many problems about prompt hazard mitigation (prevention, provision, confrontation, restoration) in the event of disaster. For these reasons, this paper presents ubiquitous urban hazard mitigation management system of new ideas which are fusion ubiquitous technology and urban hazard mitigation management system to solve the existing system problems.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.8
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• pp.12-17
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• 2009

We have implement어 a bust mode optical transmitter using digital temperature compensation architecture with a microprocessor. Instead of previous analog real time technique, we used digital sampling and holding technique for the temperature compensation in order to get stable high speed data transmission of the laser diode. This digital temperature compensation technique should be complemented the previous analog method with accuracy and effectiveness in the over Gb/s transmitting application.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.439-439
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• 2009

Nowadays, source of MEMS, USN, Hybrid parts pay attention to energy harvesting. On this paper, energy harvesting was studied using piezoelectric effect. And, piezoelectric generator was designed and fabricated. Generators were designed by FEM simulation program and generators were made by attaching cymbal type metal plates on upper and bottom sides of a disc type piezoelectric ceramic. Output AC power was rectified to DC power by full bridge circuit and converted to regular voltage power by DC-DC converter. The final output power was charged to Ni-Cd battery. Using fabricated generators, output voltages dependant on thickness of ceramic, displacement of vibration, frequency of vibration were measured.