Journal of Zhejiang University-Science C-Computers & Electronics最新文献_第10页

Querying dynamic communities in online social networks 查询在线社交网络中的动态社区

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300281

L. Weigang, E. Sandes, Jianya Zheng, A. D. de Melo, L. Uden

引用次数: 13

Transfer active learning by querying committee 通过提问委员会转移主动学习

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300167

Hao Shao, Feng Tao, Rui Xu

{"title":"Transfer active learning by querying committee","authors":"Hao Shao, Feng Tao, Rui Xu","doi":"10.1631/jzus.C1300167","DOIUrl":"https://doi.org/10.1631/jzus.C1300167","url":null,"abstract":"In real applications of inductive learning for classification, labeled instances are often deficient, and labeling them by an oracle is often expensive and time-consuming. Active learning on a single task aims to select only informative unlabeled instances for querying to improve the classification accuracy while decreasing the querying cost. However, an inevitable problem in active learning is that the informative measures for selecting queries are commonly based on the initial hypotheses sampled from only a few labeled instances. In such a circumstance, the initial hypotheses are not reliable and may deviate from the true distribution underlying the target task. Consequently, the informative measures will possibly select irrelevant instances. A promising way to compensate this problem is to borrow useful knowledge from other sources with abundant labeled information, which is called transfer learning. However, a significant challenge in transfer learning is how to measure the similarity between the source and the target tasks. One needs to be aware of different distributions or label assignments from unrelated source tasks; otherwise, they will lead to degenerated performance while transferring. Also, how to design an effective strategy to avoid selecting irrelevant samples to query is still an open question. To tackle these issues, we propose a hybrid algorithm for active learning with the help of transfer learning by adopting a divergence measure to alleviate the negative transfer caused by distribution differences. To avoid querying irrelevant instances, we also present an adaptive strategy which could eliminate unnecessary instances in the input space and models in the model space. Extensive experiments on both the synthetic and the real data sets show that the proposed algorithm is able to query fewer instances with a higher accuracy and that it converges faster than the state-of-the-art methods.","PeriodicalId":49947,"journal":{"name":"Journal of Zhejiang University-Science C-Computers & Electronics","volume":"36 1","pages":"107 - 118"},"PeriodicalIF":0.0,"publicationDate":"2014-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.C1300167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67533860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A deep learning approach to the classification of 3D CAD models 三维CAD模型分类的深度学习方法

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300185

Fei Qin, Lu-ye Li, Shu-ming Gao, Xiaoling Yang, Xiang Chen

引用次数: 56

An analytical model for source code distributability verification 源代码可分发性验证的分析模型

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300066

A. Isazadeh, J. Karimpour, Islam Elgedawy, Habib Izadkhah

{"title":"An analytical model for source code distributability verification","authors":"A. Isazadeh, J. Karimpour, Islam Elgedawy, Habib Izadkhah","doi":"10.1631/jzus.C1300066","DOIUrl":"https://doi.org/10.1631/jzus.C1300066","url":null,"abstract":"One way to speed up the execution of sequential programs is to divide them into concurrent segments and execute such segments in a parallel manner over a distributed computing environment. We argue that the execution speedup primarily depends on the concurrency degree between the identified segments as well as communication overhead between the segments. To guarantee the best speedup, we have to obtain the maximum possible concurrency degree between the identified segments, taking communication overhead into consideration. Existing code distributor and multi-threading approaches do not fulfill such requirements; hence, they cannot provide expected distributability gains in advance. To overcome such limitations, we propose a novel approach for verifying the distributability of sequential object-oriented programs. The proposed approach enables users to see the maximum speedup gains before the actual distributability implementations, as it computes an objective function which is used to measure different distribution values from the same program, taking into consideration both remote and sequential calls. Experimental results showed that the proposed approach successfully determines the distributability of different real-life software applications compared with their real-life sequential and distributed implementations.","PeriodicalId":49947,"journal":{"name":"Journal of Zhejiang University-Science C-Computers & Electronics","volume":"15 1","pages":"126 - 138"},"PeriodicalIF":0.0,"publicationDate":"2014-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.C1300066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67532011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Model predictive control of servo motor driven constant pump hydraulic system in injection molding process based on neurodynamic optimization 基于神经动力学优化的注射成型伺服电机驱动恒泵液压系统模型预测控制

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300182

Yong-gang Peng, Jun Wang, Wei Wei

引用次数: 23

A pruning algorithm with L1/2 regularizer for extreme learning machine 极限学习机的1/2正则化剪枝算法

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300197

Ye-tian Fan, Wei Wu, Wenyu Yang, Qin-wei Fan, Jian Wang

引用次数: 12

High-speed, fixed-latency serial links with Xilinx FPGAs 高速，固定延迟串行链路与赛灵思fpga

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-02-01 DOI: 10.1631/jzus.C1300249

Xue Liu, Qing Deng, Bo-ning Hou, Ze-ke Wang

{"title":"High-speed, fixed-latency serial links with Xilinx FPGAs","authors":"Xue Liu, Qing Deng, Bo-ning Hou, Ze-ke Wang","doi":"10.1631/jzus.C1300249","DOIUrl":"https://doi.org/10.1631/jzus.C1300249","url":null,"abstract":"High-speed, fixed-latency serial links find application in distributed data acquisition and control systems, such as the timing trigger and control (TTC) system for high energy physics experiments. However, most high-speed serial transceivers do not keep the same chip latency after each power-up or reset, as there is no deterministic phase relationship between the transmitted and received clocks after each power-up. In this paper, we propose a fixed-latency serial link based on high-speed transceivers embedded in Xilinx field programmable gate arrays (FPGAs). First, we modify the configuration and clock distribution of the transceiver to eliminate the phase difference between the clock domains in the transmitter/receiver. Second, we use the internal alignment circuit of the transceiver and a digital clock manager (DCM)/phase-locked loop (PLL) based clock generator to eliminate the phase difference between the clock domains in the transmitter and receiver. The test results of the link latency are shown. Compared with existing solutions, our design not only implements fixed chip latency, but also reduces the average system lock time.","PeriodicalId":49947,"journal":{"name":"Journal of Zhejiang University-Science C-Computers & Electronics","volume":"15 1","pages":"153 - 160"},"PeriodicalIF":0.0,"publicationDate":"2014-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.C1300249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67534339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Quantitative evaluation of model consistency evolution in compositional service-oriented simulation using a connected hyper-digraph 基于连通超有向图的组合服务仿真模型一致性演化定量评价

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-01-01 DOI: 10.1631/jzus.C1300089

Linjun Fan, Yunxiang Ling, Xing-tao Zhang, Jun Tang

{"title":"Quantitative evaluation of model consistency evolution in compositional service-oriented simulation using a connected hyper-digraph","authors":"Linjun Fan, Yunxiang Ling, Xing-tao Zhang, Jun Tang","doi":"10.1631/jzus.C1300089","DOIUrl":"https://doi.org/10.1631/jzus.C1300089","url":null,"abstract":"Appropriate maintenance technologies that facilitate model consistency in distributed simulation systems are relevant but generally unavailable. To resolve this problem, we analyze the main factors that cause model inconsistency. The analysis methods used for traditional distributed simulations are mostly empirical and qualitative, and disregard the dynamic characteristics of factor evolution in model operational running. Furthermore, distributed simulation applications (DSAs) are rapidly evolving in terms of large-scale, distributed, service-oriented, compositional, and dynamic features. Such developments present difficulty in the use of traditional analysis methods in DSAs, for the analysis of factorial effects on simulation models. To solve these problems, we construct a dynamic evolution mechanism of model consistency, called the connected model hyper-digraph (CMH). CMH is developed using formal methods that accurately specify the evolutional processes and activities of models (i.e., self-evolution, interoperability, compositionality, and authenticity). We also develop an algorithm of model consistency evolution (AMCE) based on CMH to quantitatively and dynamically evaluate influencing factors. Experimental results demonstrate that non-combination (33.7% on average) is the most influential factor, non-single-directed understanding (26.6%) is the second most influential, and non-double-directed understanding (5.0%) is the least influential. Unlike previous analysis methods, AMCE provides good feasibility and effectiveness. This research can serve as guidance for designers of consistency maintenance technologies toward achieving a high level of consistency in future DSAs.","PeriodicalId":49947,"journal":{"name":"Journal of Zhejiang University-Science C-Computers & Electronics","volume":"15 1","pages":"1 - 12"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.C1300089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67533388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Exponential stability of nonlinear impulsive switched systems with stable and unstable subsystems 具有稳定和不稳定子系统的非线性脉冲切换系统的指数稳定性

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-01-01 DOI: 10.1631/jzus.C1300123

Xiao-li Zhang, Anhui Lin, Jianjian Zeng

引用次数: 6

Activity-based simulation using DEVS: increasing performance by an activity model in parallel DEVS simulation 使用DEVS的基于活动的仿真:通过并行DEVS仿真中的活动模型提高性能

Journal of Zhejiang University-Science C-Computers & Electronics Pub Date : 2014-01-01 DOI: 10.1631/jzus.C1300121

Bin Chen, Lao-bing Zhang, Xiao-cheng Liu, H. Vangheluwe

引用次数: 5