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Implementation of Swinging-up and Stabilizing Controllers for Inverted Pendulum on Cart System

Implementation of Swinging-up and Stabilizing Controllers fo...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Ekachai Asa Taworn Benjanarasuth Songmoung Nundrakwang Jongkol Ngamwiwit Noriyuki Komine Faculty of Engineering and Research Center for Communications and Information Technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Department of Applied Computer Engineering School of Information Technology and Electronics Tokai University Hiratsuka Kanagawa Japan

In this paper, an implementation of swinging-up and stabilizing controllers for an inverted pendulum on cart is presented. The energy control concept is employed to swing the inverted pendulum up to around the upright position within the assigned switching condition. After that, the stabilizing controller is then switched to stabilize the inverted pendulum at the upright position. The stabilizing controller is a linear servo state feedback controller designed by coefficient diagram method. The experimental results show that the designed controllers can be mutually operated with acceptable efficiency.

关键词： Control systems Weight control Lagrangian functions Information technology Linear feedback control systems Mathematical model Equations Communication system control Power engineering and energy Servomechanisms

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Integrated Wireless Rogue Access Point Detection and Counterattack System

Integrated Wireless Rogue Access Point Detection and Counter...

引用

International Conference on Information Security and Assurance, ISA

作者： Songrit Srilasak Kitti Wongthavarawat Anan Phonphoem Thai Computer Emergency Response Team (ThaiCERT) National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Intelligent Wireless Network Group (IWING) Department of Computer Engineering Faculty of Engineering Kasetsart University Bangkok Thailand

In this paper we propose the integrated solution for detection and counterattack the rogue access points. Classification of rogue access point and related risk assessment is analyzed. Rogue detection algorithm is also proposed. Our proposed solution is effective and low cost. It is designed to utilize the existing wireless LAN infrastructure. There is no need to acquire the new RF devices or dedicated wireless detection sensors. The experiments in the real system are demonstrated.

关键词： Communication system security Wireless LAN Protection Authorization Information security Wireless networks Internet Telecommunication traffic Local area networks Intelligent networks

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Effect of Exposure Energy, Focus Range, and Surface Reflection on the Photolithography Process of Contact Hole Patterning

Effect of Exposure Energy, Focus Range, and Surface Reflecti...

引用

International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： R. Sonboonton E. Chaowicharat P. Meesapawong J. Ladthidej W. Titiroongruang C. Hruanun Electronic Research Center Department of Electronics Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center National Electronics and Computer Technology Center Amphur Muang Chachoengsao Thailand

The patterning the contact holes by photolithography process, in this case polysilicon contacts, is the process to produce electrical connection between metal layer and polysilicon gates or metal layer and source/drain. The photolithography process can control size and shape of the contact hole patterns on photoresist before permanently patterned by etching process and then metallization. The contact holes were specified to have the size of 0.8 micron after the photolithography process. In order to achieve this, the process parameters to be considered are exposure energy, focus length of the lens system, and the effect of light reflecting from the film topography underneath. Since in the previous processing step, the attempt to reduce the film topography was done by planarization using BPSG. By adjusting the exposure energy and focus, the optimal condition, to produce 0.8 micron contact holes, was found to be energy of 305 mJ/cm 2 and focus of -1.0 mum.

关键词： Lithography Resists Surface treatment Reflection Contacts Logic gates Planarization

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A 2.4-GHz 43-dB CMOS Logarithmic Amplifier for RF Signal Level Detection

A 2.4-GHz 43-dB CMOS Logarithmic Amplifier for RF Signal Lev...

引用

International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： S. Wongnamkam A. Thanachayanont M. Krairiksh National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Faculty of Engineering and Research Center of Communications and Information technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

This paper describes the design and implementation of a 2.4-GHz fully-differential logarithmic amplifier for RF signal power detection. A novel self-bias wideband amplifier without on-chip inductor is employed as a limiting amplifier stage. The proposed logarithmic amplifier is realized and fabricated in a 0.35-mum CMOS technology. Measurement results showed that the circuit achieved 43-dB voltage gain, while drawing 73.5 mA from a single 2.5-V power supply voltage.

关键词： Bandwidth CMOS integrated circuits Limiting Gain Capacitors Rectifiers RF signals

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OTA-based electronically adjustable floating positive/negative resistor

OTA-based electronically adjustable floating positive/negati...

引用

SICE Annual Conference

作者： Wandee Petchmaneelumka Thawatchai Kamsri Chaleampan Wangwiwatthana Vanchai Riewruja Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center (TMEC National Electronics and Computer Technology Center Amphur Muang Chachoengsao Thailand

ISBN: (纸本)9784907764302

This paper presents a method to realize an operational transconductance amplifier (OTA) based adjustable floating resistor. The magnitude of the resulting resistance can be electrically varied by changing the external bias currents of OTAs. The proposed resistor is based on an active network termed ldquodual-output voltage-to-current (DO-V/I) converterrdquo, which is the OTA-based voltage-to-current converter with electronically variable property. The realization method provides both a positive and a negative resistance using the same scheme. The proposed design is attractive in the terms of simple configuration and low cost. Experimental results showing the circuit performance based on the use of the commercially available OTAs are includes.

关键词： Resistors Resistance Transconductance Total harmonic distortion Oscillators Electronic mail Circuit optimization

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An accurate CCII-based voltage controlled current source

An accurate CCII-based voltage controlled current source

引用

International Conference on Control, Automation and Systems ( ICCAS)

作者： Anucha Kaewpoonsuk Vanchai Riewruja Apinai Rerkratn Thawatchai Kamsri Department of Physics Faculty of Science Naresuan University Phitsanulok Thailand Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center (TMEC) National Electronics and Computer Technology Center Thailand

In this paper, a voltage controlled current source (VCCS) providing low distortion in output signal and wide output current range is introduced. In order to obtain the high accuracy, the proposed technique employs the designed scheme to connect in feedback loop of the basic VCCS based on second generation current conveyor (CCII). This scheme consists of instrumentation and differential amplifiers and one resistor. The performances of the proposed circuit were studied through the use of PSPICE simulation program. Simulation results are agreed with the expected values.

关键词： Voltage control Instruments Thermal resistance Automatic voltage control Control systems Differential amplifiers Feedback loop Resistors Circuit simulation Automation

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Evaluation of voice activity and voicing detection

Evaluation of voice activity and voicing detection

引用

INTERSPEECH 2008 - 9th Annual Conference of the International Speech Communication Association

作者： Kotnik, Bojan Sendorek, Pierre Astrov, Sergey Koc, Turgay Ciloglu, Tolga Fernández, Laura Docío Banga, Eduardo Rodríguez Höge, Harald Kačič, Zdravko Faculty of Electrical Engineering and Computer Science University of Maribor Slovenia Department TSI Signal-Images Telecom Paristech France Corporate Technology Siemens AG Munich Germany Electrical and Electronics Eng. Dept Middle East Technical University Ankara Turkey Signal Processing and Communications Dept. University of Vigo Spain

This paper describes the ECESS evaluation campaign of voice activity and voicing detection. Standard VAD classifies signal into speech and non-speech, we extend it to VAD+ so that it classifies a signal as a sequence of non-speech, voiced and unvoiced segments. The evaluation is performed on a portion of the Spanish SPEECON database with manually labeled segmentation. To avoid errors caused by the limited precision of manual labeling we introduce "dead zones" -tolerance intervals ±5 ms around label changes in the data set. In these tolerance intervals we don't evaluate the signal. Copyright © 2008 ISCA.

关键词： Speech communication

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A Low-Latency GTS Strategy in IEEE802.15.4 for Industrial Applications

A Low-Latency GTS Strategy in IEEE802.15.4 for Industrial Ap...

引用

International Conference on Future Generation Communication and Networking (FGCN)

作者： Youling Zhou Yi Wang Jianhua Ma Junpin Jia Furong Wang College of Information Science and Technology Hainan University China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China Faculty of Computer & Information Sciences Hosei University Tokyo Japan

ISBN: (纸本)9781424440085

For industrial applications, real-time performance is a critical issue of wireless sensor network. IEEE802.15.4 protocol has greater potential compared with other protocols. However, it can¿t meet the strict requirements of real-time performance in industrial environment. After analyzing the demands of versatile applications in industrial environment and guaranteed time slots (GTS) mechanism in the IEEE802.15.4, this paper presents a new proposal including scheduling and publishing mechanism of GTS, which can significantly reduce the delay and improve the real-time performance of the network.

关键词： Open loop systems Wireless sensor networks Costs Automatic control Job shop scheduling Automation Time factors Communication industry Protocols Condition monitoring

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Merged three-terminal magnetotransistor based on the carrier recombination - deflection effect

Merged three-terminal magnetotransistor based on the carrier...

引用

IEEE SENSORS

作者： Chana Leepattarapongpan Naritchapan Penpondee Toempong Phetchakul Weera Phengan Eakalak Chaowicharat Charndet Hruanun Amporn Poyai Thai Microelectronics Center National Electronics and Computer Technology Center Chachoengsao Thailand Electronic research center Department of ElectronicFaculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

This article presents a merged three terminals magnetotransistor based on the carrier recombination - deflection effect. This particular magnetotransistor structure relies on the combination of difference of base current and collector current in +x and -x directions. As a result, the output voltage and absolute sensitivity to magnetic field will be double. The structure of magnetotransistor consists of one emitter, two collector and two base contacts. The devices can detect magnetic field in vertical direction (B Z ) by relying on the difference between base current and collector current (DeltaI CB ). From the experiment, with emitter current at 5, 8, and 10 mA, the magnetotransistor had the highest sensitivity of 1.125 mV/mT when emitter current was at 10 mA.

关键词： Magnetic separation Magnetic fields Magnetic sensors Magnetic devices Spontaneous emission Voltage Chaos Microelectronics CMOS process CMOS technology

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Audio-Visual Speech Processing Framework for Lip Reading

Audio-Visual Speech Processing Framework for Lip Reading

引用

International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： Abdulbaset M. Nasr Abd Rahman Ramli Mohammad Hamiruce Shamala K Subramaniam Robotics Lab Institute of advanced technology Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer and Communications Systems Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Electrical and Electronics Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Communication Technology & Networks Faculty of Computer Science and Information Technology Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

It is well known that speech production and perception process is inherently bimodal consisting of audio and visual components. Recently there has been increased interest in using the visual modality in combination with the acoustic modality for improved speech processing. This field of study has gained the title of audio-visual speech processing. Lip movement recognition, also known as lip reading, is a communication skill which involves the interpretation of lip movements in order to estimate some important parameters of the lips that include, but not limited to, size, shape and orientation. In this paper, we represent a hybrid framework for lip reading which is based on both audio and visual speech parameters extracted from a video stream of isolated spoken words. The proposed algorithm is self-tuned in the sense that it starts with an estimations of speech parameters based on visual lip features and then the coefficients of the algorithm are fine-tuned based on the extracted audio parameters. In the audio speech processing part, extracted audio features are used to generate a vector containing information of the speech phonemes. These information are used later to enhance the recognition and matching process. For lip feature extraction, we use a modified version of the method used by F. Huang and T. Chen for tracking of multiple faces. This method is based on statistical color modeling and the deformable template. The experiments based on the proposed framework showed interesting results in recognition of isolated words.

关键词： Speech processing Image processing Parameter estimation Data mining Feature extraction Robots computer networks Systems engineering and theory Communications technology computer science

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