نتایج جستجو برای: complex dof

تعداد نتایج: 789398  

Journal: :CoRR 2014
Yi Luo Tharmalingam Ratnarajah Anastasios K. Papazafeiropoulos

In this paper, we study the achievable degrees-of-freedom (DoF) regions of the K-user multiple-input-single-output (MISO) time correlated broadcast channel (BC). The time correlation induces knowledge of the current channel state information at transmitter (CSIT) with an estimation error P−α, where P is the signal-to-noise ratio (SNR). We consider the following two scenarios: (i) K-user with K-...

Journal: :Applied optics 2013
Won-Gyum Kim Nam-Won Moon Manoj Kumar Singh Hwang-Kyeom Kim Yong-Hoon Kim

Quasi-optical imaging systems require low blurring effect and large depth of focus (DOF) to get an acceptable sharpness of the image. To reduce aberration-limited blurring, the aspheric convex plano lenses with an aperture diameter of 350 mm are designed in W-band. We analyzed theoretically and experimentally the millimeter-wave band lens characteristics, such as beam spot size, spatial resolut...

2011
Stefan Preitl Radu-Emil Precup Zsuzsa Preitl

The paper presents aspects concerning the tuning of two-degree-of-freedom (2-DOF) fuzzy controllers focused on 2-DOF PI-fuzzy controllers and 2-DOF PIDfuzzy controllers. 2-DOF Mamdani and Takagi-Sugeno fuzzy control system structures are offered. The tuning is based on mapping the parameters of the linear PI and PID controllers to the parameters of the fuzzy controllers in terms of the modal eq...

2012
Massimo Sartori Monica Reggiani Dario Farina David G. Lloyd

This work examined if currently available electromyography (EMG) driven models, that are calibrated to satisfy joint moments about one single degree of freedom (DOF), could provide the same musculotendon unit (MTU) force solution, when driven by the same input data, but calibrated about a different DOF. We then developed a novel and comprehensive EMG-driven model of the human lower extremity th...

2003
Keehoon Kim Wan Kyun Chung Youngil Youm

N OT CO PY Design and Analysis of a New 7-DOF Parallel Type Haptic Device : PATHOS-II Keehoon Kim Wan Kyun Chung Dept. of Mechanical Engineering, Pohang University of Science and Technology(POSTECH), Pohang, Korea Tel : +82-54-279-2844, Fax : +82-54-279-5899, E-mail : fkhk,wkchungg@postech.ac.kr Abstract Most tele-operation to manipulate an object consists of gripping and manipulation and two o...

Journal: :JRM 2003
Kenjiro Takentura Takashi Maeno

A multi-DOF ultrasonic motor developed by the authors can generate multi-DOF rotation of a spherical rotor using three orthogonal natural vibrations of a bar-shaped stator. The ultrasonic motor is suitable for making small, lightweight and simple multi-DOF motion unit. In the present paper, a control methodology for the multi-DOF ultrasonic motor is proposed and a motion control test using the ...

2013
Ye Tian Aylin Yener

This paper investigates the degrees of freedom (DoF) of the L-cluster, K-user MIMO multi-way relay channel, where users in each cluster wish to exchange messages within the cluster, and they can only communicate through the relay. A novel DoF upper bound is derived by providing users with carefully designed genie information. Achievable DoF is identified using signal space alignment and multipl...

2001
Kazufumi Nishikawa Kouichirou Asama Kouki Hayashi Hideaki Takanobu Atsuo Takanishi

Vocal movement isn't only a movement of the vocal organs. It is also a movement that produces acoustic signals received by hearing as linguistic information through hydroacoustic phenomena along with the formation of the vocal way. The purpose of this research is to make clear the human vocal mechanism from the view of engineering by simulating the vocal movement with a robot, and to create the...

2001
Kenjiro Takemura Dai Harada Takashi Maeno

Endoscopes for industrial and medical fields are expected to have multi degree-of-freedom (DOF) motions. A multi-DOF ultrasonic motor we developed consists of a spherical rotor and a bar-shaped stator, and the rotor rotates around three perpendicular axes using three natural vibration modes of the stator. In this study, a multi-DOF unilateral master-slave system for active endoscope using the m...

2005
Joon-young Kim James K. Mills Milos R. Popovic

In this paper, an application of the dynamics and control of redundant robotic systems is presented in order to investigate the feasibility of functional electrical stimulation assisted arm-free standing for paraplegics. Through the inverse dynamics analysis of a three dimensional dynamic model of quiet standing, several sets of the minimum number of degrees of freedom (DOF) such that there are...

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