• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2005.11a
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• pp.49-53
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• 2005

The disaster prevention information system is to comprehensively support information collection, processing, search and supply in disaster counter measuring activities, as well as to manage information mainly related to natural disasters unilaterally. Building an optimal system in adequate consideration of features and demands in terms of disaster prevention is requested. Suitable infrastructure that can support information technology (IT) in various aspects should be established in order to utilize IT effectively in disaster prevention information. In addition. accuracy, reliability and efficiency as a disaster prevention information system should be equipped with. In this study, a basic framework for the establishment of disaster prevention information system is presented.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.6
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• pp.1370-1374
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• 2013

The suitcase can follow its owner all on its own via the Bluetooth connectivity in your phone. A robotic vacuum cleaner than can understand voice commands and even follow homeowner. Robots are used in a variety of applications such as a robot wheelchair. In this paper, I focus the problem of automatic return to the base in the process of developing the moving robot for loading things. In this paper, I propose the indoor localization method which is able to determine the position of the robot in the building by using image processing techniques.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.3C
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• pp.224-232
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• 2012

Priority MAC is an important issue in every communication system when we consider differentiated service applications. In this paper, we propose a mechanism to support priority MAC based on multi-parameters for IEEE 802.15.7 visible light communication (VLC). By using three parameters such as number of backoff times (NB), backoff exponent (BE) and contention window (CW), we provide priority for multi-level differentiated service applications. We consider beacon-enabled VLC personal area network (VPAN) mode with slotted version for random access algorithm in this paper. Based on a discrete-time Markov chain, we analyze the performance of proposed mechanism under non-saturation environments. By building a Markov chain model for multi-parameters, this paper presents the throughput and transmission delay time for VLC system. Numerical results show that we can apply three parameters to control the priority for VLC MAC protocol.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.3058-3060
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• 2005

In this paper, the CMOS four-quadrant analog multipliers for low-voltage low-power applications are presented. The circuit approach is based on the characteristic of the LV (Low-Voltage) composite transistor which is one of the useful analog building blocks. SPICE simulations are carried out to examine the performances of the designed multipliers. Simulation results are obtained by $0.25{\mu}m$ CMOS parameters with 2V power supply. The LV composite transistor can easily be extended to perform a four-quadrant multiplication. The multiplier has a linear input range up to ${\pm}0.5V$ with a linearity error of less than 1%. The measured -3dB bandwidth is 290MHz and the power dissipation is $37{\mu}W$. The proposed multiplier is expected to be suitable for analog signal processing applications such as portable communication equipment, radio receivers, and hand-held movie cameras.

• 한국방재학회:학술대회논문집
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• 2009.02b
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• pp.13-24
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• 2009

This paper introduces various kinds of applications of the scenario-based seismic risk assessment in Taiwan. Seismic scenario simulation (SSS) is a GIS-based technique to assess distribution of ground shaking intensity, soil liquefaction probability, building damages and associated casualties, interruption of lifeline systems, economic losses, etc. given source parameters of an earthquake. The SSS may integrate with rapid earthquake information release system to obtain valuable information and to assist in decision-making processes to dispatch rescue and medical resources efficiently. The SSS may also integrate with probabilistic seismic hazard analysis to evaluate various kinds of risk estimates, such as average annual loss and probable maximum loss in one event, in a probabilistic sense and to help proposing feasible countermeasures.

• Proceedings of the Membrane Society of Korea Conference
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• 1995.06a
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• pp.39-50
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• 1995

The membrane processes that are commonly uscd in water and wastewater treatment are reverse osmosis (Ro), ultrafiltration (UF) and microfiltration (MF), which utilize pressure differentials. There is also nano-filtration (NF), or low-pressure reverse osmosis, which is positioned midway between conventional reverse osmosis and ultrafiltration. Reverse osmosis membranes reject dissolved ions, while ultrafiltration can be used to reject relatively larger molecules, such as protein, polysacchalides and so on. Microfiltration is capable of eliminating particles at submicron level. This paper summarizes the characteristics of MSAS process first, as it is the main membrane process applied to wastewater treatment. Two successful examples of the applications, the cases of individual building reuse system and nightsoil treatment, are then shown. The latest trend of new membrane applications, i.e., immersed-type MSAS is also introduced.

• IEMEK Journal of Embedded Systems and Applications
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• v.1 no.1
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• pp.14-19
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• 2006

Integrated development environment (IDE) plays an important role in reducing the developm ent time, thereby improving software development productivity. In recent years, ubiquitous sensor networks (USNs) have become increasingly popular. However their application software is developed mostly using command-line-based tools. Such a development process is not only likely to be error-prone but also inconvenient to debug errors. This paper describes a novel IDE for USN application developers called Nano Esto that provides a single, consistent, and integrated environment for building and executing USN applications. The Nano Esto helps the developers edit and cross-compile source code and download the executable image to the program memory of sensor nodes with just a few button clicks. It also provides support for configuring an application-specific kernel, simulating a wireless sensor network, and estimating power consumption in each sensor node. Currently, Nano Esto runs on Linux as well as on Windows with the same look and feel.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.755-758
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• 2002

This paper presents a second-generation CMOS current conveyor (CCII) consisting of a rail-to-rail complementary N- and P-channel differential input stage for the voltage input, a class AB push-pull stage for the current input, and current mirrors far the current outputs. The CCII was implemented using a double-poly triple-metal 0.6 ${\mu}$m n-well CMOS process, to confirm its operation experimentally. A prototype chip achieves a rail-to-rail swing ${\pm}$2.4 V under ${\pm}$2.5 V power supplies and shows the exact voltage and current following performances up to 100 MHz. Because of its high performances, the CCII proposed herein is quite useful for a building block of current-mode circuits. The applications of the proposed CCII to current-mode filters are also described.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2002.11a
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• pp.108-117
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• 2002

본 연구에서는 지역진흥기반구축사업을 추진중인 광주광산업, 경남기계산업, 대구섬유산업, 부산 신발산업을 대상으로 정보지원센터, 전자카달로그 구축사업 사례를 비교하고 그 차이점을 분석하여 본다. 이론적 고찰과 문헌연구를 통해 사례연구모델을 제시하고 지역특화산업과 정보지원센터, 전자카달로그 대한 자료를 수집하여, 본 논문에서 제시된 사례연구 모델에 입력하고 지역특화산업과 정보지원센터, 전자 카달로그 구축사업과의 연계성을 알아본다. 본 논문은 국가에서 정책적으로 추진 중인 지역진흥기반구축사업을 배경으로 하고 있는 광주광산업, 경남기계산업, 대구섬유산업, 부산신발산업을 대상으로 정보지원센터와 전자카달로그 사업을 비교하여 차이점을 분석한 것으로 현재 사업을 주관하고 있는 사업추진기관에게 좋은 자료가 될 것이며, 특화산업 정보지원센터나 전자카달로그를 이용하여 전자거래를 하고자 하는 기업이나 사용자에게도 좋은 자료가 될 것이다.

• Proceedings of the KSRS Conference
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• 2008.10a
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• pp.122-125
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• 2008

Sensors used in many USN (Ubiquitous Sensor Network) domain applications generate a large amount of sensor stream data. The volume of sensor stream data is too huge to store the whole data and data speed is too fast to control each of them. In order to provide rapid and reliable context analysis service over sensor stream data, we propose a WHEN-DO context analysis model that supports the functionality of sliding window. This model is designed to be used as follows: If the sensor stream data satisfies condition in 'WHEN' clause, then it will execute actions in 'DO' clause in WHEN-DO context analysis model. The proposed WHEN-DO context analysis model can be applied to many other USN environment applications such as monitoring the status of a building and then taking actions in corresponding context condition.