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排序方式: 共有135条查询结果,搜索用时 15 毫秒
1.
This research uses a Distributed Artificial Intelligence (DAI) framework to efficiently utilize the infrastructure available for process planning in a batch processing PWB assembly facility. The DAI approach decomposes the entire production control task into several sub-tasks. Then, the sub-tasks are implemented by the basic elements of the DAI system called ‘intelligent agents’. By working collectively, the intelligent agents of the DAI system can arrive at a solution for the problem. The DAI system initially proposes all possible solutions generated by the intelligent agents. Then, a fuzzy coordination technique is utilized to evaluate the solutions and to find the most appropriate one for shopfloor implementation. Using inputs such as the short-term production plan, design data, shopfloor observation data, and CAD information, the DAI system provides applicable production plans with ranks for the feasibility of current assembly activities. 相似文献
2.
Vikram Venkatadri Venkatesh Arasanipalai Raghavan Varun Kesavakumaran Sarah S. Lam Krishnaswami Srihari 《Simulation Modelling Practice and Theory》2011,19(7):1544-1557
Cardiac catheterization is one of the critical procedures in patient care. It is pertinent for all process related issues in this department to be handled with due priority. This research is a cross-functional effort with a leading hospital that was in its planning stage to implement an overall process improvement at its cardiac catheterization lab department. It has been determined that significant process delays exist in this department. One of the identified key factors to process improvement was to reduce patient turnaround time. Process mapping was used to study the system and identify potential sources of delays in the system. A set of qualitative recommendations were put forward. These recommendations, include the reduction of wait time of outpatients and inpatients and the reduction of non-value-added times such as transfer time of patients, were evaluated using a discrete event simulation approach. The simulation study shows that the daily operating hours at the catheterization lab could be reduced, aiding to reallocate staff for discharging other duties, as the hospital may require. 相似文献
3.
Nikhil Date Prakash Krishnaswami V.V. Satish K. Motipalli 《Computers & Industrial Engineering》2009,56(1):198-207
In this paper, we present a methodology for automating the process planning and NC code generation for a widely encountered class of free-form features that can be machined on a 3-axis mill–turn center. The free-form feature family that is considered is that of extruded protrusions whose cross-section is a closed, periodic B-Spline curve. In this methodology, for machining a part with B-Spline protrusion located at the free end, the part is first rough turned to the maximum profile diameter of the B-Spline, followed by rough profile cutting and finish profiling with axially mounted end mill tools. The identification and sequencing of machining volumes is completely automated, as is the generation of actual NC code. The approach supports both convex and non-convex profiles. In the case of non-convex profiles, the process planning algorithm ensures that there is no gouging of the work piece by the tool. The algorithm also identifies when sections of the tool path lie outside the work piece and utilizes rapid traverses in these regions to reduce cutting time. This methodology presents an integrated turn–mill process planning where by making the process fully automated from design with no user intervention making the overall process planning efficient. The algorithm was tested on several examples and test parts using the unmodified NC code obtained from the implementation were run on a Moriseiki mill–turn center. The parts that were produced met the dimensional specifications of the desired part. 相似文献
4.
Hull JJ Srihari SN Choudhari R 《IEEE transactions on pattern analysis and machine intelligence》1983,(4):384-395
The use of diverse knowledge sources in text recognition and in correction of letter substitution errors in words of text is considered. Three knowledge sources are defined: channel characteristics as probabilities that observed letters are corruptions of other letters, bottom-up context as letter conditional probabilities (when the previous letters of the word are known), and top-down context as a lexicon. Two algorithms, one based on integrating the knowledge sources in a single step and the other based on sequentially cascading bottom-up and top-down processes, are compared in terms of computational/storage requirements and results of experimentation. 相似文献
5.
The binary n-gram and Viterbi algorithms have been suggested as alternative approaches to contextual postprocessing for text produced by a noisy channel such as an optical character recognizer. This correspondence describes the underlying theory of each approach in unified terminology, and presents new implementation algorithms for each approach. In particular, a storage efficient data structure is proposed for the binary n-gram algorithm and a recursive formulation is given for the Viterbi algorithm. Results of extensive experiments with each algorithm are described. 相似文献
6.
Boundary detection in multidimensions 总被引:1,自引:0,他引:1
Udupa JK Srihari SN Herman GT 《IEEE transactions on pattern analysis and machine intelligence》1982,(1):41-50
The development of image processing algorithms for time-varying imagery and computerized tomography data calls for generalization of the concepts of adjacency, connectivity, boundary, etc., to three and four-dimensional discrete spaces. This paper defines these basic concepts in unified terminology and presents algorithms for a boundary detection task in multidimensional space. The performance of these algorithms is discussed with respect to theoretical maximum complexity, and is illustrated with simulated computerized tomography data. 相似文献
7.
Shekhar Tyagi V. G. Sathe Gaurav Sharma Velaga Srihari Himanshu Kumar Poswal 《Journal of Materials Science》2018,53(10):7224-7232
In the earlier pressure-dependent Raman spectroscopic studies, it has been reported that BaTiO3 undergoes a tetragonal to cubic phase transition above ~ 2 GPa, whereas pressure-dependent X-ray absorption, X-ray diffuse scattering studies and pair distribution function studies have reported the presence of a low-symmetry rhombohedral phase above ~ 2.3 GPa. In this report, we present our pressure-dependent Raman spectroscopic studies on polycrystalline BaTiO3 which shows that it first undergoes a transition from tetragonal to orthorhombic/rhombohedral phase above ~ 2.6 GPa and then finally goes to the cubic phase above 8.4 GPa. Pressure-dependent synchrotron X-ray diffraction (SXRD) studies have also been carried out that provided rate of change of volume as a function of pressure resulting in bulk modulus of 215 ± 9 GPa. 相似文献
8.
Kumar AA Rao YU Joseph AL Mani KR Swaminathan K 《Journal of Bioscience and Bioengineering》2002,94(5):375-383
Purification of a rabies vaccine by a single zonal centrifugation run was replaced by two runs with optimal standardization of the sucrose density gradient. As a result, significant reductions in the levels of substrate DNA and bovine serum protein in the Vero cell-derived human rabies vaccine were achieved. Following many trials, for the first run, loading of the 3.2-l capacity K-3 rotor with 1800 ml of 60% sucrose solution and 1400 ml of vaccine PBS buffer solution gave a satisfactory linear gradient. However, after the first run, the substrate DNA and bovine serum contents exceeded the required levels. After protamine sulphate and Tween-80 treatment of the concentrated inactivated material, a second run using the same procedure as in the first run was tried. However, these purification procedures resulted in low virus recovery. To achieve optimal virus recovery, and removal of substrate DNA and bovine serum protein, the peak fractions from the first run as indicated by the haemagglutination, sucrose concentration, and optical density values were pooled and the sucrose concentration of the pooled fractions was increased to 60%. A second (flotation) run was then carried out. Using this method, the virus recovery rate was more than 95% that of the first run, and the levels of cellular DNA and bovine serum protein were well within the acceptable limits of less than 100 pg/dose and one part per million, respectively. The substrate DNA was quantified by both radioactive labeling and non-radioactive biotin labeling methods. For the quantification of calf serum protein, a counter-immunoelectrophoresis method was developed and effectively applied. A potency assay was performed using the National Institutes of Health (NIH) and well-standardized in vitro single radial immuno diffusion (SRD) methods. Finally, an immunogenicity study was conducted with human volunteers and the results were confirmed by a rapid fluorescent focus inhibition test (RFFIT). 相似文献
9.
L. Gopalakrishnan K. Srihari 《The International Journal of Advanced Manufacturing Technology》1999,15(8):587-596
The focus of this work was to develop a robust assembly process for low and high input/output (I/O) ball grid arrays (BGAs).
The test vehicles considered had a wide variety of components including full and perimeter array BGAs, and ultrafine pitch
peripheral leaded devices. Experimental design techniques were applied in order to identify, screen, and control the parameters
that affect the stencil printing process. The factors that affect the process were screened using Tagu-chi-based methodology.
These significant factors and their interactions were then further analysed using full factorial designs. The volume and the
quality of the solder paste deposits were considered as the response variables. Response surface plots were developed to provide
process windows for paste deposition. Process capability studies were performed to evaluate the capability of the solder paste
deposition process. Boards were assembled using optimal settings obtained from the experiments. No process-induced defects
were found, and 100% yield was obtained. 相似文献
10.
Parvathinathan Venkitasubramaniam Srihari Adireddy Lang Tong 《The Journal of VLSI Signal Processing》2005,41(3):329-344
We consider a distributed medium access protocol, Opportunistic ALOHA, for reachback in sensor networks with mobile access
points (AP). We briefly discuss some properties of the protocol, like throughput and transmission control for an orthogonal
CDMA physical layer. We then consider the incorporation of necessary side information like location into the transmission
control and numerically demonstrate the loss in throughput in the absence of such information. Through simulations, we discuss
the robustness and sensitivity of the protocol under various modeling errors and propose strategies to allow for errors in
estimation of some parameters without reduction in the throughput. For networks, where the sensors are allowed to collaborate,
we consider three coding schemes for reliable transmission: spreading code independent, spreading code dependent transmission
and coding across sensors. These schemes are compared in terms of achievable rates and random coding error exponents. The
coding across sensors scheme has comparable achievable rates to the spreading code dependent scheme, but requires the additional
transmission of sensor ID. However, the scheme does not require the mobile AP to send data through the beacon unlike the other
two schemes. The use of these coding schemes to overcome sensitivity is demonstrated through simulations.
Parvathinathan Venkitasubramaniam was born in India in 1981. He received his B.Tech. degree from the department of Electrical Engineering, Indian Institute
of Technology, Madras in 2002. He joined the School of Electrical and Computer Engineering, Cornell University, Ithaca, NY,
in 2002 and he is working toward his Ph.D. degree. He is a recipient of the 2004 Leonard G. Abraham Award (with S. Adireddy
and L. Tong) from the IEEE Communications Society. His research interests include random-access protocols,sensor networks,
and information theory.
Srihari Adireddy was born in India in 1977. He received the B.Tech. degree from the Department of Electrical Engineering, Indian Institute
of Technology, Madras, and M.S. and Ph. D. degrees from the School of Electrical and Computer Engineering, Cornell University,
Ithaca, NY in 2001 and 2003 respectively. Currently, he is working at Silicon Laboratories, Austin, TX. He is a recipient
of the 2004 Leonard G. Abraham Award (with P. Venkitasubramaniam and L. Tong) from the IEEE Communications Society. His research
interests include signal processing, information theory, and random-access protocols.
Lang Tong received the B.E. degree from Tsinghua University, Beijing, China, in 1985, and M.S. and Ph.D. degrees in electrical engineering
in 1987 and 1990, respectively, from the University of Notre Dame, Notre Dame, Indiana. He was a Postdoctoral Research Affiliate
at the Information Systems Laboratory, Stanford University in 1991. Currently, he is a Professor in the School of Electrical
and Computer Engineering, Cornell University, Ithaca, New York.
Dr. Tong received Young Investigator Award rom the Office of Naval Research in 1996, and the Outstanding Young Author Award from the IEEE Circuits and Systems Society in 1991, the 2004 IEEE Signal Processing Society Best Paper Award (with M. Dong),
the 2004 Leonard G. Abraham Prize Paper Award from the IEEE Communications Society (with P. Venkitasubramaniam and S. Adireddy).
His areas of interest include statistical signal processing, adaptive receiver design for communication systems, signal processing
for communication networks, and information theory. 相似文献