New types of miniature actuators so called cybernetic actuator for biomedical robotics are developed. The cybernetic actuator has four driving states: free, increasing, decreasing and lock. The state of free and lock ...
详细信息
New types of miniature actuators so called cybernetic actuator for biomedical robotics are developed. The cybernetic actuator has four driving states: free, increasing, decreasing and lock. The state of free and lock provides safety characteristics for both human and mechanism by avoiding damage from overload. The rotary type and linear type of cybernetic actuators are designed and developed. Feasibility of both actuators is verified by experiments. Four driving states are confirmed and unique driving principle is verified successfully.< >
A new type of miniature actuator, the so-called cybernetic actuator, for medical application has been proposed and developed. The cybernetic actuator has four driving states: free, increasing, decreasing and locked. A...
详细信息
A new type of miniature actuator, the so-called cybernetic actuator, for medical application has been proposed and developed. The cybernetic actuator has four driving states: free, increasing, decreasing and locked. A rotary-type cybernetic actuator and a linear-type cybernetic actuator driven by piezoelectric devices have been constructed. The feasibility of both actuators was verified by driving experiments.< >
Kerr electro-optic field mapping measurements using the sensitive AC modulation method were made in liquid nitrogen. The steady-state electric fields between parallel stainless steel electrodes that had a gap of 7 mm ...
详细信息
Kerr electro-optic field mapping measurements using the sensitive AC modulation method were made in liquid nitrogen. The steady-state electric fields between parallel stainless steel electrodes that had a gap of 7 mm are shown to be essentially uniform for voltages up to 70 kV with no significant space charge distortion. The Kerr constant B of liquid nitrogen is constant over the AC modulation frequency range of 1-20 kHz, while increasing above 20 kHz. This change of B with the modulation frequency coincides with the frequency-amplitude gain characteristic of the lock-in amplifier used, so that B is independent of the AC modulation frequency within the range of this study. B monotonically decreases with increasing temperature, T, thus decreasing liquid nitrogen density, rho , so that B is related linearly to rho /T. The polarizability anisotropy of liquid nitrogen is evaluated to be 8.3*10/sup -41/ F-m/sup 2/ from the slope of the B-( rho /T) characteristic, obtained from a simple physical model.< >
作者：
NARAYANAN, VMANELA, MLADE, RKSARKAR, TKDepartment of Electrical and Computer Engineering
Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore
India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade.Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India
on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was
Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue...
详细信息
Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue problem. Since the matrix is also sparse, the eigenvalue problem can be solved quickly and efficiently using the conjugate gradient method resulting in considerable savings in computer storage and time. Comparison is made with the analytical solution for the loaded dielectric waveguide case. For the microstrip case, we get both waveguide modes and quasi-TEM modes. The quasi-TEM modes in the limit of zero frequency are checked with the static analysis which also uses finite difference. Some of the quasi-TEM modes are spurious. This article describes their origin and discusses how to eliminate them. Numerical results are presented to illustrate the principles.
作者：
KING, JFBARTON, DEJ. Fred King:is the manager of the Advanced Technology Department for Unisys in Reston
Virginia. He earned his Ph.D. in mathematics from the University of Houston in 1977. He has been principal investigator of research projects in knowledge engineering pattern recognition and heuristic problem-solving. Efforts include the development of a multi-temporal multispectral classifier for identifying graincrops using LANDSAT satellite imagery data for NASA. Also as a member of the research team for a NCI study with Baylor College of Medicine and NASA he helped develop techniques for detection of carcinoma using multispectral microphotometer scans of lung tissue. He established and became technical director of the AI Laboratory for Ford Aerospace where he developed expert scheduling modeling and knowledge acquisition systems for NASA. Since joining Unisys in 1985 he has led the development of object-oriented programming environments blackboard architectures data fusion techniques using neural networks and intelligent data base systems. Douglas E. Barton:is manager of Logistics Information Systems for Unisys in Reston
Virginia. He earned his B.A. degree in computer science from the College of William and Mary in 1978 and did postgraduate work in London as a Drapers Company scholar. Since joining Unisys in 1981 his work has concentrated on program management and software engineering of large scale data base management systems and design and implementation of knowledge-based systems in planning and logistics. As chairman of the Logistics Data Subcommittee of the National Security Industrial Association (NSIA) he led an industry initiative which examined concepts in knowledge-based systems in military logistics. His responsibilities also include evaluation development and tailoring of software engineering standards and procedures for data base and knowledge-based systems. He is currently program manager of the Navigation Information Management System which provides support to the Fleet Ballistic Missile Progr
A valuable technique during concept development is rapid prototyping of software for key design components. This approach is particularly useful when the optimum design approach is not readily apparent or several know...
详细信息
A valuable technique during concept development is rapid prototyping of software for key design components. This approach is particularly useful when the optimum design approach is not readily apparent or several known alternatives need to be rapidly evaluated. A problem inherent in rapid prototyping is the lack of a "target system" with which to interface. Some alternatives are to develop test driver libraries, integrate the prototype with an existing working simulator, or build one for the specific problem. This paper presents a unique approach to concept development using rapid prototyping for concept development and scenario-based simulation for concept verification. The rapid prototyping environment, derived from artificial intelligence technology, is based on a blackboard architecture. The rapid prototype simulation capability is provided through an object-oriented modeling environment. It is shown how both simulation and blackboard technologies are used collectively to rapidly gain insight into a tenacious problem. A specific example will be discussed where this approach was used to evolve the logic of a mission controller for an autonomous underwater vehicle.
The effects of light irradiation of a He-Cd laser (441.6 nm) on MBE growth of ZnS x Se 1− x ( x =0−0.13) were studied. The growth rates of the epilayers were reduced and the photo-desorption rate constanSts of Zn, Se ...
详细信息
The effects of light irradiation of a He-Cd laser (441.6 nm) on MBE growth of ZnS x Se 1− x ( x =0−0.13) were studied. The growth rates of the epilayers were reduced and the photo-desorption rate constanSts of Zn, Se and S were obtained. In the photoluminescence spectra at 11 K, the intensities of the free exciton emission increased, and thus the crystallinity of the epilayers was found to be improved. The behavior of surface adatoms on the growing surface under laser irradiation is discussed.
An optimum composition x of MBE-ZnS x Se 1− x /GaAs has been studied by surface morphology, X-ray diffraction and fluorescence microscopic study to obtain epilayers with the best quality. The epilayers with a lattice-...
详细信息
An optimum composition x of MBE-ZnS x Se 1− x /GaAs has been studied by surface morphology, X-ray diffraction and fluorescence microscopic study to obtain epilayers with the best quality. The epilayers with a lattice-matching composition at the growth temperature ( x gt =0.083) had extremely smooth surfaces and the minimum FWHM of X-ray rocking curves in spite of thermal strain. Also, the orange emission due to Ga diffusion from the substrate was not observed at the epilayer-substrate interface in these epilayers. The epilayers with the best quality were grown with the composition of x gt .
ZnSe epilayers have been successfully grown at a low temperature of 150°C for the first time by photoassisted molecular beam epitaxy. A He-Cd laser (441.6 nm) with an intensity of about 300 mW/cm2 was used as a l...
详细信息
ZnSe epilayers have been successfully grown at a low temperature of 150°C for the first time by photoassisted molecular beam epitaxy. A He-Cd laser (441.6 nm) with an intensity of about 300 mW/cm2 was used as a light source. The free-exciton line in photoluminescence spectra at 11 K was sharp and strong, comparable with that of unirradiated epilayers grown at 340°C which is the optimum growth temperature without irradiation.
暂无评论