Search results for: Tae-Seok Lee

Items from 1 to 18 out of 18 results

chapter

Performance analysis of fading reduction using the diversity antenna and 2×2 smart antenna for 802.11p WAVE V2V communication

Jun-Ho Kim, Tae-Seok Lee, Tae-Geon Lee, Hak-Lim Ko, more

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN) > 548 - 550

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN)

In this paper, we have research the reduction of the fading characteristics by using the diversity antenna and 2×2 smart antenna. For V2V performance through 5.86GHz WAVE band. Measurements were performed in Choenan-si of South Korea. We found out that the fading reduction effect of the selection diversity antenna compared to the 2×2 smart antenna was 0.65–4.25dB higher in LOS and 1.15–1.75dB better...

chapter

A SMS Based Ubiquitous Home Care System

Tae-seok Lee, Yuan Yang, Myong-Soon Park

Lecture Notes in Computer Science > High Performance Computing and Communications > Track 18: Pervasive Computing and Communications > 1049-1057

In this study, we defined requirements of ubiquitous environment, which users can monitor and control situations of home anytime, anywhere. In addition we developed and built a model that can be combined with latest home network technologies. Various middleware technologies such as UPnP, JINI and LonWork, were being studied and developed to build home network. However, they still remains in wired...

chapter

Adapted Listening in Wireless Sensor Network MAC Protocol

Zhen Fu, Yuan Yang, Tae-Seok Lee, Myong-Soon Park

Lecture Notes in Computer Science > Ubiquitous Intelligence and Computing > Track 4: Sensor Networks > 546-555

Research activity in the area of medium-access control protocols of wireless sensor networks (WSN) has grown dramatically in the past few years. A number of MAC protocols are proposed to achieve energy efficiency upon the limitation of WSN which are usually deployed in a special environment, assigned with long-term work, and supported by limited battery. It is found that there is a trade-off between...

chapter

An Energy-Efficient Uni-scheduling Based on S-MAC in Wireless Sensor Network

Tae-Seok Lee, Yuan Yang, Ki-Jeong Shin, Myong-Soon Park

Lecture Notes in Computer Science > High Performance Computing and Communications > Track 6: Wireless and Mobile Computing > 293-304

S-MAC is a MAC (Medium Access Control) protocol as specialized for the wireless sensor network in order to sacrifice transmission delay and extend the working life of the whole sensor nodes. S-MAC, which was made by modifying IEEE 802.11, reduced the energy wasted in the wireless sensor network by using a periodic listen and sleep scheduling method. The first task that the wireless sensor network...

chapter

The analysis of coherence bandwidth and coherence time for underwater channel environments using experimental data in the West sea, Korea

Min-Sang Kim, Tae-Seok Lee, Tae-Ho Im, Hak-Lim Ko

OCEANS 2016 - Shanghai > 1 - 4

OCEANS 2016 - Shanghai

In this paper, research was carried out to analyze the channel environment in the real sea using data measured in the shallow water of West sea of South Korea. By diversifying the distance between transmitter and receiver, we estimated RMS delay spread and maximum excess delay spread in various channel environments to draw coherence bandwidth and then estimated Doppler spread of received signal to...

chapter

Performance analysis of FMT-OFDM system in the underwater channel environment

Min-Sang Kim, Tae-Seok Lee, Jun-Ho Kim, Tae-Ho Im, more

OCEANS 2016 - Shanghai > 1 - 4

OCEANS 2016 - Shanghai

In this study, performance verification of Resource spread FMT-OFDM system and FMT-OFDM system is carried out through a simulation in the underwater channel environment. The measurement was performed in the shallow water of Geojedo located in Namhae-gun, for the real sea channel modeling. We also analyzed the channel delay profile in different underwater channel environments by distance between transmitter...

article

Solid-state selenization of printed Cu(In,Ga)S2 nanocrystal layer and its impact on solar cell performance

Sang-Wook Park, Deok-In Kim, Tae-Seok Lee, KyeUng Lee, more

Solar Energy Materials and Solar Cells > 2014 > 125 > Complete > 66-71

Cu(In,Ga)S ₂ nanopowder was printed on Mo-coated sodalime glass substrates and selenized from a Se-coated cover glass. The selenized Cu(In,Ga)(Se,S) ₂ film consisted of three layers with a different morphologies and micro-structures. Although the top layer showed large grains recrystallized from nanocrystals, the bottom layer was almost identical to the original precursor. The middle...

article

A new hybrid terrain coverage method for underwater robotic exploration

Tae-Seok Lee, Beom Hee Lee

Journal of Marine Science and Technology > 2014 > 19 > 1 > 75-89

It is well known that it is difficult to explore underwater terrains using an autonomous underwater vehicle due to the varieties and complexities of underwater terrain elements. Since conventional underwater terrain coverage techniques are usually based on the assumption that the underwater surface is planar, they generate an unnecessary exploration path especially on steep sloped surfaces of ocean...

chapter

A survey of map merging techniques for cooperative-SLAM

Heon-Cheol Lee, Seung-Hwan Lee, Tae-Seok Lee, Doo-Jin Kim, more

2012 9th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI) > 285 - 287

2012 9th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

This paper presents a survey of map merging techniques for cooperative-SLAM. The recently proposed map merging techniques are classified into two categories: direct map merging and indirect map merging. In each category, several techniques are briefly described. Then, their advantages and disadvantages are discussed in the context of accuracy and computation time. The description and discussion can...

chapter

A visual landmark design method for high speed multiple robots

Tae-Seok Lee, Jae-Guk Lee, Beom-Hee Lee

2011 IEEE/SICE International Symposium on System Integration (SII) > 573 - 578

2011 IEEE/SICE International Symposium on System Integration (SII 2011)

The visual structured landmarks used in robot localization are popularly utilized in the mobile robot navigation field. When the localization of the robot implies fast and accurate performances, such landmarks can be used in visual surveillance systems to get very efficient results. This paper suggests a visual landmark designing methodology for high speed multiple mobile robots. The conventional...

chapter

A sensor fusion system using enhanced extended Kalman filter with double fuzzy logics for autonomous robot guidance

Seung-Hwan Lee, Tae-Seok Lee, Beom-Hee Lee

2011 IEEE/SICE International Symposium on System Integration (SII) > 579 - 584

2011 IEEE/SICE International Symposium on System Integration (SII 2011)

This paper presents a sensor fusion system for autonomous guidance of a robot. The sensor fusion system is physically composed of a laser range finder and two vision sensors. Also, it is systematically designed to fuse the information obtained from sensors and to overcome those sensor's drawbacks. To be specific, it utilizes double fuzzy logics for fusion and extended Kalman filter for estimation...

chapter

Comparison and analysis of scan matching techniques for Cooperative-SLAM

Heon-Cheol Lee, Seung-Hee Lee, Seung-Hwan Lee, Tae-Seok Lee, more

2011 8th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI) > 165 - 168

2011 8th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI 2011)

A scan matching technique is a key technique to implement Cooperative-SLAM (C-SLAM). Although a variety of scan matching techniques have been developed, each of them has both merits and faults. This paper compares and analyzes three well-known scan matching techniques which are ICP (Iterative Closest Points), HSM (Hough Scan Matching), and PSM (Polar Scan Matching). The comparison and analysis are...

chapter

The smart antenna module for RF repeater

Seong-Goo Lee, Tae-Seok Lee, Min-Sang Kim, Dae-Young Cho, more

The 17th Asia Pacific Conference on Communications > 599 - 603

2011 IEEE 17th Asia-Pacific Conference on Communications (APCC 2011)

The signals received at the receiving antenna are consist of signals from base station (or mobile terminal) and transmitted signals from the other side of antenna in a RF repeater. And the amplification rate of the RF repeater is limited by the feedbacked signals from the same repeater. Therefore, a receiving antenna has to be isolated from a transmitting antenna in order to reduce the effect of the...

article

Design and optimization of a combined fuel reforming and solid oxide fuel cell system with anode off-gas recycling

Tae Seok Lee, J.N. Chung, Yen-Cho Chen

Energy Conversion and Management > 2011 > 52 > 10 > 3214-3226

An energy conversion and management concept for a combined system of a solid oxide fuel cell coupled with a fuel reforming device is developed and analyzed by a thermodynamic and electrochemical model. The model is verified by an experiment and then used to evaluate the overall system performance and to further suggest an optimal design strategy. The unique feature of the system is the inclusion of...

chapter

Mobile robot navigation with reactive free space estimation

Tae-Seok Lee, Gyu-Ho Eoh, Jimin Kim, Beom-Hee Lee

2010 IEEE/RSJ International Conference on Intelligent Robots and Systems > 1799 - 1804

2010 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2010)

One of the fundamental requirements of an autonomous mobile robot is that it must not collide with obstacles. This paper addresses the problem of controlling an autonomous robot to avoid obstacles for reactive route following navigation. The four-wheeled mobile robot is equipped with three monocular cameras for route following and a range sensor for obstacle avoidance. The equipped robot moves route...

chapter

3-D terrain covering and map building algorithm for an AUV

Tae-Seok Lee, Jeong-Sik Choi, Jeong-Hee Lee, Beom-Hee Lee

2009 IEEE/RSJ International Conference on Intelligent Robots and Systems > 4420 - 4425

2009 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2009)

In order to improve the efficiency of a terrain covering algorithm for a robot (AUV), an artificial island(AI) technique is developed. Such an algorithm is necessary to acquire information and make a terrain map in an unknown three dimensional underwater environment. This algorithm considers that the three dimensional environment consists of a number of planes, at various ocean depths. The artificial...

chapter

ZnO p-n Junction Photodetectors

Linghui Li, J. Lubguban, Ping Yu, H.W. White, more

2007 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

CLEO '07. 2007 Conference on Lasers and Electro-Optics

We report optical and electrical characterizations of newly developed ZnO p-n junction photodiode detectors. The spectral photoresponse and I-V properties show the detector is a promise candidate for UV detection.

article

Gastric mucormycosis

Young Sook Park, Jung Don Lee, Tae Hun Kim, Yeon Ho Joo, more

Gastrointestinal Endoscopy > 2002 > 56 > 6 > 904-905

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