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A Per-User QoS Enhancement Strategy via Downlink Cooperative Transmission Using Distributed Antennas
LEE, Byungseok,JANG, Ju Wook,PARK, Sang-Gyu,SUNG, Wonjin The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.12
<P>In this letter, we address a strategy to enhance the signal-to-interference plus noise ratio (SINR) of the worst-case user by using cooperative transmission from a set of geographically separated antennas. Unlike previously reported schemes which are based on either the power control of individual antennas or cooperative orthogonal transmission, the presented strategy utilizes the minimum-mean-squared error (MMSE) filter structure for beamforming, which provides increased robustness to the external interference as well as the background noise at the receiver. By iteratively updating the cooperative transmission beamforming vector and power control (PC), the balanced SINR is obtained for all users, while the transmission power from each antenna also converges to within the constrained value. It is demonstrated that proposed MMSE beamforming significantly outperforms other existing schemes in terms of the achievable minimum SINR.</P>
Lee, Byungseok,Lee, Donghwe,Chin, Seongah Hindawi Limited 2018 Journal of sensors Vol.2018 No.-
<P>Motions using Leap Motion controller are not standardized while the use of it is spreading in media contents. Each content defines its own motions, thereby creating confusion for users. Therefore, to alleviate user inconvenience, this study categorized the commonly used motion by Amusement and Functional Contents and defined the Structural Motion Grammar that can be universally used based on the classification. To this end, the Motion Lexicon was defined, which is a fundamental motion vocabulary, and an algorithm that enables real-time recognition of Structural Motion Grammar was developed. Moreover, the proposed method was verified by user evaluation and quantitative comparison tests.</P>
이병석(ByungSeok Lee),황선주(Sunju Hwang),이준화(JOON HWA LEE),김규식(Gyu-Sik Kim),김조천(Jo-Chun Kim) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.5
This paper presents an IAQ(Indoor Air Quality) Monitoring System using equipments for measurement of fine particle(PM1~PM10). CO₂, VOCs(Volatile Organic Compounds). temperature and humidity for IAQ monitoring of subway station which millions of people use a day. The necessity of IAQ monitoring system is getting increased for more effective subway station monitoring in line with the recent government's regulation for IAQ is reinforcing. Subway Station is an unusual case. The structure of subway station is closed and complicated. Therefore when data of equipments are transferred, transmission error can happen occasionally. To prevent transmission error, an IAQ Monitoring System is needed the appropriate position and selection of equipments or sensor module. In addition IT (Information Technology) can be utilized like "WiBro(Wireless Broadband)" and "GateWay" for facilitate movement of data and construction of IAQ monitoring system of subway station.
Passenger airbag 전개시험을 위한 인스투르먼트 판넬의 PAB Door 성능 예측방법 고찰
이병석(Byungseok Lee),성낙규(Nakgyu Sung),김영표(Yeongpyo Kim),박준호(Junho Park),김형곤(Hyounggon Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
It took a lot of development time and cost due to failure modes of PAB door during PAB deployment in the previous program. This document shows prediction process, which are that we analyzed factors affect the performance of PAB Door, decided the design solution throughout DOE and compared with FEA and physical test. The process is as follows: At first, it is task that enhances FEA accuracy to define a method of mesh modeling about tear seam. Second step is choices of excellent hinge design and material. And finally, we analyze main factors, carry out DOE for robustness design of PAB door.
플랜트 파라미터의 불확실성을 포함한 4-회전익(Quad-Rotor) 비행체의 정량적 궤환 이론을 이용한 자세 제어
이병석(ByungSeok Lee),허문범(Moon-Beom Heo),이준화(Joon Hwa Lee) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.3
본 논문은 플랜트 파라미터의 불확실성에도 불구하고 강인성을 보장하는 정량적 궤환이론에 대해 다루고 있다. 정량적 궤환 이론은 플랜트의 파라미터와 외란의 불확실성에 대해 주파수 영역에서 설계 사양의 강인성을 보장한다. 정량적 궤환 이론을 이용하기 위해 선정한 플랜트는 기동성이 뛰어나며 헬리콥터와 같이 수직 이착륙이 가능한 4-회전익 비행체를 이용하였으며, 4개의 블레이드를 구동하는 모터의 파라미터 불확실성을 설정하여 요구사양에 맞는 자세 제어가 가능함을 실험하였다. 또한, 자세 제어에는 4-회전익 비행체의 파라미터 변동 범위와 동작 범위를 고려한 전필터를 사용하였다. 이를 위해 MATLAB에서 정량적 궤환 이론에 의해 제어기를 설계할 수 있는 QFT control toolbox인 QFTCT를 사용하여 각 설계 단계에 대해 소개하고 있다. This paper deals with the Quantitative Feedback Thoery(QFT) guaranteeing robustness in spite of the plant parametric uncertainty. In the frequency domain, the QFT guarantees the robustness of the design specification on the uncertainty of plant parameters and disturbance. In order to use the QFT, a selected plant is a Quad Rotor Vehicle(QRV) which has excellent maneuverability and possibility of vertical take-off and landing like the helicopter. And attitude control is examined the possibility satisfied the requirement specification under the setting parametric uncertainty of motors driving 4-blades. Additionally, in an attitude control, the pre-filter considering parameter range and operating range of a QRV was used. For these purpose, in this paper, by using QFTCT, that is the QFT Control Toolbox designing the controller in MATLAB by the QFT, each design phases are introduced.
초소형 비행체 Quad Rotor를 이용한 USN 환경 가스 센싱 시스템
이병석(ByungSeok Lee),이준화(Joon Hwa Lee),김규식(Gyu-Sik Kim),김조천(Jo-Chun Kim) 대한전기학회 2008 정보 및 제어 심포지엄 논문집 Vol.2008 No.1
There are various polluting emissions related to the air quality such as NO<SUB>x</SUB>, CO₂, CO, VOCs, O₃, SO₂, CH₄, H₂S, NH₃, etc. We need the system that reduces emission of these environment gases and detects risk factors in modern society. Therefore, if we use the USN(Ubiquitous Sensor Network) techNoogy and a MAV (Micro Air Vehicle) Quad Rotor which can be hovering and moving free for setting up the environment gas sensing system. the realtime measurement on environment gases is facilitated and by extension. in application of traffic watchdog, forest fire surveillance and counter-terrorism efforts, we anticipate making better use of a Quad Rotor.
베타 확률분포를 이용한 입자 떼 최적화 알고리즘의 성능 비교
이병석(ByungSeok Lee),이준화(Joon Hwa Lee),허문범(Moon-Beom Heo) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.8
This paper deals with the performance comparison of a PSO algorithm inspired in the process of simulating the behavior pattern of the organisms. The PSO algorithm finds the optimal solution (fitness value) of the objective function based on a stochastic process. Generally, the stochastic process, a random function, is used with the expression related to the velocity included in the PSO algorithm. In this case, the random function of the normal distribution (Gaussian) or uniform distribution are mainly used as the random function in a PSO algorithm. However, in this paper, because the probability distribution which is various with 2 shape parameters can be expressed, the performance comparison of a PSO algorithm using the beta probability distribution function, that is a random function which has a high degree of freedom, is introduced. For performance comparison, 3 functions (Rastrigin, Rosenbrock, Schwefel) were selected among the benchmark Set. And the convergence property was compared and analyzed using PSO-FIW to find the optimal solution.