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检索条件"任意字段=7th International Conference on the Art, Science, and Engineering of Programming, Programming 2023"

共 1136 条记录，以下是841-850 订阅

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Synthesis of Energy-efficient Distillation Schemes from Conventional Columns to Fully thermally Coupled Systems

Synthesis of Energy-efficient Distillation Schemes from Conv...

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第七届国际分离科学与技术会议(Proceedings of the 7th international conference on Separation science and Technology)

作者： Weizhong An Zixin Lin Xigang Yuan Department of Chemical Engineering Ocean University of ChinaQingdao266100China Chemical Engineering Research Center of Tianjin UniversityTianjin PR730020

the application of a stochastic simulated annealing based methodology for the synthesis of distillation configurations using (N-1) columns to separate any zeotropic N-component feed into N product streams is *** distillation sequences considered are described by the number of column sections S,which can be changed from the minimum 2(N-1) to maximum *** each specified S,the number of heat exchangers E is then considered and allowed to vary within a range of 2(N-1) to 2,which would generates various types of thermally coupled distillation *** main feature of the methodology is the use of a coding procedure that makes use of a serial of integer numbers to generate and represent various distillation configurations,involving mixed thermally coupled-heat-integrated distillation *** order to ensure the feasibility of the structural search with a random manner,a binary sort tree approach that is originally used in data structure theory is introduced,so that the problem formulation and solution becomes *** total synthesis problem is formulated as an implicit MINLP (Mixed-integer Nonlinear programming) problem and solved with a simulated annealing algorithm to minimize the annualized cost of system.A five-component separation problem is used to illustrate the systematic *** results show that there are thirteen types of distillation schemes can be synthesized by using the suggested methodology,which provides some significant insights for the synthesis and design of multi-component distillation systems.

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Total Site Optimization for Low Temperature Processes

Total Site Optimization for Low Temperature Processes

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第七届国际分离科学与技术会议(Proceedings of the 7th international conference on Separation science and Technology)

作者： Yiqing Luo Liang Kong Xigang Yuan Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Low-temperature separation processes,such as the cold end of ethylene plant and LNG separation,consist of three correlative sections: the core process (separation sequence),the heat exchanger network (HEN) and the refrigeration ***,the separation sequences were designed first,followed by the heat exchanger network and the refrigeration system that supported *** the total energy cost is summation of all the three parts,such design methodology failed to consider the interrelation among the three sections,could not guarantee the optimal total *** order to cope with this drawback,total site optimization method is required,but too many variables and constraints make it quite a complex *** this study,the combined consideration of distillation column profiles and of low-temperature shaftwork targets in the design of low-temperature distillation-based process has been *** on stochastic optimization strategy[1] and exergy and pinch technique[2~5],a mathematical model is formulated to design low temperature processes,in which the stochastic algorithm deal with the flowsheet structure and the levels of continuous variables,and the exergy and pinch technique identify the shaftwork target without knowing the exact heat exchanger network and refrigeration *** this method,separation sequence structure and minimum total energy cost are connected directly,the operating pressure and separation structure will be the only independent variables,which makes programming solving much ***,this model can also be used to design processes with complex columns and heat *** levels of refrigerant can be optimized as ***,a case study of ethylene cold-end separation is used to illustrate the application of the *** solutions in different conditions (simple column and complex column,with or without heat integration and different refrigerant levels settings) are compared with the original scheme.

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Segmentation of Small Animal Computed Tomography Images Using Original CT Values and Converted Grayscale Values

Segmentation of Small Animal Computed Tomography Images Usin...

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7th IFIP WG 5.14 international conference,CCTA 2013

作者： Guoqiang Ma Naixiang Li Xiaojuan Wang Dept. of Computer Science & Information Engineering Tianjin Agriculture University Library Tianjin Agriculture University

ISBN: (纸本)9783642543432

Medical image segmentation is the foundation of normal and diseased tissue 3D visualization,operation simulation and visual *** this paper,we comprehensively use two values that represent the same object(body tissue),to segment by the same algorithm *** original CT images are downloaded from the web source,the dog rib tumor CT scan image by GE medical systems,all the experiment of dataset of 312 thoracic CT *** core of the segmentation is k-means clustering *** segmentation process consisted of two phases:(1) convert CT value to JPG gray value or not use the original CT value as the data sets for clustering;(2)segmentation bone tissue using the new k-means clustering algorithm program which is implemented with MATLAB 2012 a programming language and for two-dimensional data matrix *** experiment produced strikingly different *** results may be indicating that not only the segmentation algorithm of CT image is important,but also the data for segmentation is important too.

关键词： Image segmentation Computed tomography k-means clustering

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Data Fusion with Optimized Block Kernels in LS-SVM for Protein Classification

Data Fusion with Optimized Block Kernels in LS-SVM for Prote...

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the 7th international conference on Management and Service science(MASS 2013)

作者： Li Liao Department of Computer and Information Sciences University of Delaware

In this work,we developed a method to efficiently optimize the kernel function for combined data of various different sources with their corresponding kernels being already *** vectorization of the combined data is achieved by a weighted concatenation of the existing data *** induces a kernel matrix composed of the existing kernels as blocks along the main diagonal,weighted according to the corresponding the subspaces span by the *** induced block kernel matrix is optimized in the platform of least-squares support vector machines simultaneously as the LS-SVM is being trained,by solving an extended set of linear equations,other than a quadratically constrained quadratic programming as in a previous *** method is tested on a benchmark dataset,and the performance is significantly improved from the highest ROC score 0.84 using individual data source to ROC score 0.92 with data fusion.

关键词： Data Fusion Kernel Method Support Vector Machines Protein Classification

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A Two-step Design Method for Shaftwork Targeting on Low-temperature Process

A Two-step Design Method for Shaftwork Targeting on Low-temp...

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第七届国际分离科学与技术会议

作者： Yiqing Luo Shengke Feng Xigang Yuan Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin University

the chilling train is an important part of ethylene plants and it consumes over 40% of the refrigerating capacity of an ethylene plant. therefore a great deal of attention has been paid to design and optimization of the chilling train section over the past years, due to its difficult and complex nature. Usually in a low-temperature process, such as the cold end of ethylene plant and LNG separation, there is the interaction between the heat exchangers network (HEN) and the refrigeration system. the modification on HEN of the chilling train for increasing energy recovery does not always coordinate with the minimum shaft work consumption of the corresponding refrigeration system [1]. Hence, in this paper, a systematic approach of optimizing refrigeration system correlation with the chilling train in ethylene plants is presented based on the combination of pinch [2] and exergy analysis [3]. Firstly, the possibilities of ’pockets’, which appears as right nose section in the grand composite curve of the process was optimized, it not only brings down the exergy loss, but also obtains a further power saving through replacing a lower level refrigeration by a relatively higher level refrigeration [4]. Secondly, the grand composite curve of the process with cutting down the pockets is regarded as one separate part to be designed, and a mathematical programming method is explored to obtain the optimal refrigeration levels configuration by an efficient and effective way. Finally, a case study was used to illustrate the application of the approach for a propylene and ethylene refrigerant system design in the ethylene production process, when the refrigeration level is set to 8, the reduction of the shaft work loss is 34.26%, and it can increase the economic benefits of the system significantly.

关键词： Exergy shaft work Heat exchange network cold pockets low-temperature process optimization

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Mining twitterspace for information: Classifying sentiments programmatically using Java

Mining twitterspace for information: Classifying sentiments ...

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7th international conference on Digital Information Management, ICDIM 2012

作者： Fiaidhi, Jinan Mohammed, Osama Mohammed, Sabah Fong, Simon Kim, Tai Hoon Department of Computer Science Lakehead University Thunder Bay ON Canada Department of Software Engineering Lakehead University Thunder Bay ON Canada Faculty of Science and Technology University of Macau China Department of Computer Engineering Glocal Campus Konkuk University Korea Republic of

ISBN: (纸本)9781467324281

People increasingly use Twitter to share advice, opinions, news, moods, concerns, facts, rumors, and everything else imaginable. Much of that data is public and available for mining. However, classifying automatically the sentiment of the Twitter messages into either positive or negative with respect to a query term represents a new research challenge. Variety of approaches that use natural language and statistical techniques failed to report high accuracy of tweets classification due to the nature of these tweets containing large number of abbreviations, emoticons and ill structured grammar. In this article we are presenting a programming approach that uses the Weka data mining APIs to classify tweets. Using this programming approach we can experiment on how to train the classifiers and determine which one is more effective than the others. In our experiments, the K* classifier is found to report a high degree of accuracy in tweets classification. © 2012 IEEE.

关键词： Sentiment analysis

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Optimization of inhibitory decision rules relative to length and coverage

Optimization of inhibitory decision rules relative to length...

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7th international conference on Rough Sets and Knowledge Technology, RSKT 2012

作者： Alsolami, Fawaz Chikalov, Igor Moshkov, Mikhail Zielosko, Beata Mathematical and Computer Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia Institute of Computer Science University of Silesia 39 Bȩdzińska St. 41-200 Sosnowiec Poland

ISBN: (纸本)9783642318993

the paper is devoted to the study of algorithms for optimization of inhibitory rules relative to the length and coverage. In contrast with usual rules that have on the right-hand side a relation "attribute ≠ value", inhibitory rules have a relation "attribute = value" on the right-hand side. the considered algorithms are based on extensions of dynamic programming. © 2012 Springer-Verlag.

关键词： Dynamic programming

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Modeling and analysis of digital steady current circuit of transmitter for borehole-ground electrical potential measurement system

Modeling and analysis of digital steady current circuit of t...

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2012 IEEE 7th international Power Electronics and Motion Control conference - ECCE Asia, IPEMC 2012

作者： Liu, Lixuan Guo, Yinhui Liang, Huaqing Liang, Zhishan Liu, Yin College of Geophysics and Information Engineering China University of Petroleum Beijing China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China

ISBN: (纸本)9781457720864

this article, based on the main circuit structure of full-bridge DC/DC converter in the transmitter of the borehole-ground electrical potential measurement system, presents the structure of single-closed-loop current feedback control system with voltage mode control for output current stabilization. According to the average state space method, the state space equation of the main circuit with steady output current of transmitter was established, the AC small-signal model of the main circuit was acquired and the open-loop transfer function was then deduced as a result. the method of design and specific parameters of the PI compensation network were provided and the open-loop transfer function of the system was deduced. the incremental PI control algorithm was adopted and the digital control was realised by TMS320F2812 DSP system programming. MATLAB was used to analyze the system for its open-loop frequency characteristics and its closed-loop dynamic characteristics, the result of which shows the correctness of the modelling approach. © 2012 IEEE.

关键词： MATLAB

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An automatic generation approach of B specifications from UML diagrams

An automatic generation approach of B specifications from UM...

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7th international conference on Digital Information Management, ICDIM 2012

作者： Rehab, Seïdali Kerkouche, Elhillali Chaoui, Allaoua Department of Computer Science Faculty of Engineering University Mentouri of Constantine Constantine Algeria

ISBN: (纸本)9781467324281

the Transformation of UML models to B allows in one hand, automatically fusing both methods and use them in an integrated approach of rigorous, unified and practical software development. this approach starts from the expression of needs until programming passing through the design. On the other hand, it allows formal analysis of UML models in order to identify and correct errors, ambiguities, omissions and inconsistencies at the beginning of the development process via the B tools such as AtelierB. this paper proposes a solution to the UML graph transformation problem to B based on the graph grammar. the meta-modeling tool AToM3 is used to automate this process. A case study is presented to illustrate our approach. © 2012 IEEE.

关键词： Software design

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Shared path protection based on spectrum reserved matrix model in bandwidth-variable optical networks

Shared path protection based on spectrum reserved matrix mod...

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2012 7th international ICST conference on Communications and Networking in China, CHINACOM 2012

作者： Yang, Congyuan Hua, Nan Zheng, Xiaoping Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781467326995

the bandwidth-variable (BV) optical network architecture shows great advantage in resource utilization compared with traditional WDM networks, while its survivability is a more complicated optimization problem. In this paper, we proposed a Spectrum Reservation Matrix (SRM) model to characterize the shared path protection (SPP) problem of BV networks. the SRM model converts the spare capacity allocation (SCA) problem into a succinct mathematical form, offering static programming an effective approach of data structure and calculation. Both failure-independent (FID) and failure-dependent (FD) strategies are taken into consideration, and separate models for each case are given. An effective heuristic SPP algorithm for BV optical networks, named Minimum Spectrum Reservation (MSR) algorithm, is designed on the basis of SRM model. Holding the explicit objective of minimizing spectrum reservation cost, MSR algorithm shows better performance in terms of spectrum redundancy and blocking probability, in comparison with SPP employing min-hop strategy, in simulations. © 2012 IEEE.

关键词： Fiber optic networks

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