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Journal of Zhejiang University. Science最新文献

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Satellite remote sensing for urban growth assessment in Shaoxing City, Zhejiang Province. 浙江省绍兴市城市增长的卫星遥感评价。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1095
Elnazir Ramadan, Xue-zhi Feng, Zheng Cheng
{"title":"Satellite remote sensing for urban growth assessment in Shaoxing City, Zhejiang Province.","authors":"Elnazir Ramadan,&nbsp;Xue-zhi Feng,&nbsp;Zheng Cheng","doi":"10.1631/jzus.2004.1095","DOIUrl":"https://doi.org/10.1631/jzus.2004.1095","url":null,"abstract":"<p><p>Urban growth represents specific response to economic, demographic and environmental conditions. Rapid urbanization and industrializations have resulted in sharp land cover changes. The present investigation was carried out from Shaoxing City to quantify satellite-derived estimates of urban growth using a three-epoch time series Landsat TM data for the years 1984, 1997 and ETM 2000. The methodology used was based on post classification comparison. The use of GIS allowed spatial analysis of the data derived from remotely sensed images. Results showed that the built-up area surrounding Shaoxing City has expanded at an annual average of 7 km2. Analysis of the classified map showed that the physical growth of urban area is upsetting the other land cover classes such as farming, water resources, etc. The study conclusion mainly emphasized the need for sustainable urban capacity.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1095-101"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24647558","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: 36
Quasilinear singularly perturbed problem with boundary perturbation. 具有边界摄动的拟线性奇摄动问题。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1144
Jia-qi Mo
{"title":"Quasilinear singularly perturbed problem with boundary perturbation.","authors":"Jia-qi Mo","doi":"10.1631/jzus.2004.1144","DOIUrl":"https://doi.org/10.1631/jzus.2004.1144","url":null,"abstract":"<p><p>A class of quasilinear singularly perturbed problems with boundary perturbation is considered. Under suitable conditions, using theory of differential inequalities we studied the asymptotic behavior of the solution for the boundary value problem.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1144-7"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24646888","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
The characterization of weighted local hardy spaces on domains and its application. 域上加权局部hardy空间的刻画及其应用。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1148
Heng-geng Wang, Xiao-ming Yang
{"title":"The characterization of weighted local hardy spaces on domains and its application.","authors":"Heng-geng Wang,&nbsp;Xiao-ming Yang","doi":"10.1631/jzus.2004.1148","DOIUrl":"https://doi.org/10.1631/jzus.2004.1148","url":null,"abstract":"<p><p>In this paper, we give the four equivalent characterizations for the weighted local hardy spaces on Lipschitz domains. Also, we give their application for the harmonic function defined in bounded Lipschitz domains.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1148-54"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24646889","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: 3
Sensitivity analyses of cables to suspen-dome structural system. 索对悬索-穹顶结构体系的敏感性分析。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1045
Bo-qing Gao, En-hao Weng
{"title":"Sensitivity analyses of cables to suspen-dome structural system.","authors":"Bo-qing Gao,&nbsp;En-hao Weng","doi":"10.1631/jzus.2004.1045","DOIUrl":"https://doi.org/10.1631/jzus.2004.1045","url":null,"abstract":"<p><p>The construction of the cables is a key step for erecting suspen-dome structures. In practical engineering, it is difficult to ensure that the designed pre-stresses of cables have been exactly introduced into the structures in the site; so it is necessary to evaluate the influence of the variation of the pre-stresses on the structural behavior. In the present work, an orthogonal design method was employed to investigate the pre-stressed cables' sensitivity to the suspen-dome system. The investigation was concentrated on a Kiewitt suspen-dome. Parametric studies were carried out to study the sensitivity of the structure's static behavior, dynamic behavior, and buckling loads when the pre-stresses in the cables varied. The investigation indicated that suspen-dome structures are sensitive to the pre-stresses in all cables; and that the sensitivity depended on the location of the cables and the kind of structural behavior. Useful suggestions are given at the end of the paper.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1045-52"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24647552","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: 5
Identification of diesel front sound source based on continuous wavelet transform. 基于连续小波变换的柴油机前声源识别。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1069
Zhi-yong Hao, Jun Han
{"title":"Identification of diesel front sound source based on continuous wavelet transform.","authors":"Zhi-yong Hao,&nbsp;Jun Han","doi":"10.1631/jzus.2004.1069","DOIUrl":"https://doi.org/10.1631/jzus.2004.1069","url":null,"abstract":"<p><p>Acoustic signals from diesel engines contain useful information but also include considerable noise components. To extract information for condition monitoring purposes, continuous wavelet transform (CWT) is used for the characterization of engine acoustics. This paper first reviews CWT characteristics represented by short duration transient signals. Wavelet selection and CWT are then implemented and wavelet transform is used to analyze the major sources of the engine front's exterior radiation sound. The research provides a reliable basis for engineering practice to reduce vehicle sound level. Comparison of the identification results of the measured acoustic signals with the identification results of the measured surface vibration showed good agreement.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1069-75"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24647555","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: 18
A front-end automation tool supporting design, verification and reuse of SOC. 支持SOC设计、验证和重用的前端自动化工具。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1102
Xiao-lang Yan, Long-li Yu, Jie-bing Wang
{"title":"A front-end automation tool supporting design, verification and reuse of SOC.","authors":"Xiao-lang Yan,&nbsp;Long-li Yu,&nbsp;Jie-bing Wang","doi":"10.1631/jzus.2004.1102","DOIUrl":"https://doi.org/10.1631/jzus.2004.1102","url":null,"abstract":"<p><p>This paper describes an in-house developed language tool called VPerl used in developing a 250 MHz 32-bit high-performance low power embedded CPU core. The authors showed that use of this tool can compress the Verilog code by more than a factor of 5, increase the efficiency of the front-end design, reduce the bug rate significantly. This tool can be used to enhance the reusability of an intellectual property model, and facilitate porting design for different platforms.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1102-5"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24647559","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 study on sampling strategies in the figure cognitive process. 图形认知过程中的抽样策略研究。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1160
Li-ren Cao, Hao Su, Zhen-fu Cao
{"title":"A study on sampling strategies in the figure cognitive process.","authors":"Li-ren Cao,&nbsp;Hao Su,&nbsp;Zhen-fu Cao","doi":"10.1631/jzus.2004.1160","DOIUrl":"https://doi.org/10.1631/jzus.2004.1160","url":null,"abstract":"<p><p>This study was aimed at investigating the sampling strategies for 2 types of figures: 3-D cubes and human faces. The research was focused on: (a) from where the sampling process started; (b) in what order the figures' features were sampled. The study consisted of 2 experiments: (a) sampling strategies for 3-D cubes; (b) sampling strategies for human faces. The results showed that: (a), for 3-D cubes, the first sampling was mostly located at the outline parts, rarely at the center part; while for human faces, the first sampling was mostly located at the hair and outline parts, rarely at the mouth or cheek parts, in most cases, the first sampling-position had no significant effects on cognitive performance and that (b), the sampling order, both for 3-D cubes and for human faces, was determined by the degree of difference among the sampled-features.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1160-4"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24646891","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: 5
Intrusion detection using rough set classification. 基于粗糙集分类的入侵检测。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1076
Lian-hua Zhang, Guan-hua Zhang, Jie Zhang, Ying-cai Bai
{"title":"Intrusion detection using rough set classification.","authors":"Lian-hua Zhang,&nbsp;Guan-hua Zhang,&nbsp;Jie Zhang,&nbsp;Ying-cai Bai","doi":"10.1631/jzus.2004.1076","DOIUrl":"https://doi.org/10.1631/jzus.2004.1076","url":null,"abstract":"<p><p>Recently machine learning-based intrusion detection approaches have been subjected to extensive researches because they can detect both misuse and anomaly. In this paper, rough set classification (RSC), a modern learning algorithm, is used to rank the features extracted for detecting intrusions and generate intrusion detection models. Feature ranking is a very critical step when building the model. RSC performs feature ranking before generating rules, and converts the feature ranking to minimal hitting set problem addressed by using genetic algorithm (GA). This is done in classical approaches using Support Vector Machine (SVM) by executing many iterations, each of which removes one useless feature. Compared with those methods, our method can avoid many iterations. In addition, a hybrid genetic algorithm is proposed to increase the convergence speed and decrease the training time of RSC. The models generated by RSC take the form of \"IF-THEN\" rules, which have the advantage of explication. Tests and comparison of RSC with SVM on DARPA benchmark data showed that for Probe and DoS attacks both RSC and SVM yielded highly accurate results (greater than 99% accuracy on testing set).</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1076-86"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24647556","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: 52
Robust H(infinity) output feedback control for a class of uncertain Lur'e systems with time-delays. 一类不确定时滞Lur系统的鲁棒H(∞)输出反馈控制。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1114
Feng-wen Cao, Ren-quan Lu, Hong-ye Su, Jian Chu
{"title":"Robust H(infinity) output feedback control for a class of uncertain Lur'e systems with time-delays.","authors":"Feng-wen Cao,&nbsp;Ren-quan Lu,&nbsp;Hong-ye Su,&nbsp;Jian Chu","doi":"10.1631/jzus.2004.1114","DOIUrl":"https://doi.org/10.1631/jzus.2004.1114","url":null,"abstract":"<p><p>In this work, the analysis of robust stability and design of robust H infinity output feedback controllers for a class of Lur'e systems with both time-delays and parameter uncertainties were studied. A robust H infinity output feedback controller based on Linear Matrix Inequalities (LMIs) was developed to guarantee the robust stability and H infinity performance of the resultant closed-loop system. The presented design approach is based on the application of descriptor model transformation and Park's inequality for the bounding of cross terms and is expected to be less conservative compared to reported design methods. Finally, illustrative examples are advanced to demonstrate the superiority of the obtained method.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1114-23"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24646884","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: 3
A novel 3-stage structure for a low-noise, high-gain and gain-flattened L-band erbium doped fiber amplifier. 一种新型的低噪声、高增益、增益平坦的l波段掺铒光纤放大器的三级结构。
Journal of Zhejiang University. Science Pub Date : 2004-09-01 DOI: 10.1631/jzus.2004.1130
Ze-xuan Qiang, Sai-ling He, Xu-liang Zhang, Lin-fang Shen
{"title":"A novel 3-stage structure for a low-noise, high-gain and gain-flattened L-band erbium doped fiber amplifier.","authors":"Ze-xuan Qiang,&nbsp;Sai-ling He,&nbsp;Xu-liang Zhang,&nbsp;Lin-fang Shen","doi":"10.1631/jzus.2004.1130","DOIUrl":"https://doi.org/10.1631/jzus.2004.1130","url":null,"abstract":"<p><p>The configuration of the novel three-stage L-band erbium-doped fiber amplifier with very large and flat gain and very low noise figure presented in this paper uses the forward ASE (amplified spontaneous emission) from the first section of the EDF (erbium-doped fiber) and the backward ASE from the third section of the EDF (both serve as the secondary pump sources of energy) to pump the second EDF. To improve the pump efficiency, the power of the pump is split into two parts (with a ratio of e.g. 2:7). The characteristics of this L-band EDFA are studied on the basis of the Giles Model with ASE.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 9","pages":"1130-4"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24646886","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: 3
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