{"title":"A New Class of Nyquist Pulses with a Monomial Roll-Off","authors":"M. Zandi, A. Grami","doi":"10.1109/CCECE.2007.23","DOIUrl":"https://doi.org/10.1109/CCECE.2007.23","url":null,"abstract":"A class of Nyquist pulses with a monomial roll-off is proposed. Using the measures of closeness to Nyquist-II criterion (eye-width) and robustness to sampling phase jitter, their performances are assessed. It is shown that these pulses generally outperform the pulses with cosine or linear roll-offs.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"30 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122800240","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}
{"title":"Multiple Access Transmitted Reference Pulse Cluster System for UWB Communications","authors":"Li Jin, Xiaodai Dong","doi":"10.1109/CCECE.2007.336","DOIUrl":"https://doi.org/10.1109/CCECE.2007.336","url":null,"abstract":"A new transmitted reference structure for ultra-wideband (UWB) communication named transmitted reference (TR) pulse cluster was proposed recently, where the delay between the reference and data pulses is sufficiently short to meet the implementation requirements. In this paper, the multiple access problem for TR pulse cluster systems are investigated and two approaches are compared. The code-division-multiple-access (CDMA) based on block spreading can successfully convert the multi-user interference (MUI) to inter-symbol interference (ISI). However, it requires block long analog wideband delay lines and may not be suitable for implementation. In comparison, time-division-multiple-access (TDMA) is a natural fit to the TR pulse cluster system due to its simplicity.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121888536","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}
{"title":"Investigating Cache Energy Efficiency in Multimedia Processors","authors":"K. J. Deris, A. Baniasadi","doi":"10.1109/CCECE.2007.131","DOIUrl":"https://doi.org/10.1109/CCECE.2007.131","url":null,"abstract":"In this work we study how cache complexity impacts energy and performance in multimedia processors. We estimate cache energy budget for a multimedia processor similar to Intel's XScale and calculate energy and latency break-even points for realistic and ideal cache organizations. We show that design efforts made to reduce cache miss rate are only justifiable if the associated latency and energy overhead remain below the calculated break-even points. Moreover, we show that, for the applications studied here, the instruction cache has a lower latency break-even point compared to the data cache. However, investing energy in the data cache is likely to result in better energy efficiency compared to the instruction cache. We also study alternative cache configurations and investigate if such alternatives would improve energy-efficiency.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117309682","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}
N. Messaoudi, O. Hammi, J. Sirois, S. Boumaiza, F. Ghannouchi
{"title":"A Comparative Study of Power Amplifiers' Sensitivity to Load Mismatch: Single Branch vs. Doherty Architectures","authors":"N. Messaoudi, O. Hammi, J. Sirois, S. Boumaiza, F. Ghannouchi","doi":"10.1109/CCECE.2007.384","DOIUrl":"https://doi.org/10.1109/CCECE.2007.384","url":null,"abstract":"This paper proposes a comparative study of the sensitivity of different power amplifiers architectures to load mismatch. The two considered architectures are a single branch class AB power amplifier, and a multi-branch architecture using the Doherty dynamic load modulation technique. Two LDMOS based power amplifiers operating around 1.95 GHz are used. The magnitude of the load reflection coefficient is varied from 0 to 0.2 in steps of 0.05. For each of these values, the phase of the load reflection coefficient is swept over 360° in steps of 45°. The amplifiers' linearity and power added efficiency variations with the load reflection coefficients are evaluated. It is found that the Doherty amplifier is less sensitive to load mismatch than a single branch class AB amplifier in terms of its efficiency performance. However, the linearity performance of the single branch class AB amplifier is less sensitive to the load mismatch than that of the Doherty amplifier.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129829668","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}
{"title":"Spin-On Glass as a Sacrificial Layer for Patterned Metallization of Compliant SU-8 Microstructures","authors":"A. Ma, S. Tsang, M. Parameswaran, A. Leung","doi":"10.1109/CCECE.2007.78","DOIUrl":"https://doi.org/10.1109/CCECE.2007.78","url":null,"abstract":"A new micromachining technique is described in this paper for polymer MEMS process. By using spin-on glass (SOG) as the underlying sacrificial layer, existing SU-8 micromachining processing has been enhanced to allow for metallization, patterning, as well as post-development hard baking of SU-8 structures. Chemical compatibility of the SOG sacrificial layer makes direct metallization and patterning on top of unreleased SU-8 structures possible. Detail fabrication process flow and fabricated structures are presented in this paper.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129877517","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}
{"title":"Characterization of Work and Power Efficiency of Micromachined Polymer Thermal Actuators","authors":"D. Sameoto, M. Hamidi, M. Parameswaran","doi":"10.1109/CCECE.2007.361","DOIUrl":"https://doi.org/10.1109/CCECE.2007.361","url":null,"abstract":"In this paper, an analysis is completed on three distinct styles of thermal actuator fabricated in a polymer micromachining process. These actuators are the most reliable way of producing force and deflection on the microscale using polymers. A variety of designs have been fabricated and tested for displacement characteristics and force output, and show great promise for high force applications. Polymer thermal actuators operate at far lower temperatures than silicon thermal actuators, and produce large forces and deflections. Comparisons of polymer thermal actuators to silicon actuators indicate that they can be several orders of magnitude more effective with respect to work output for a given input power.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128261209","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}
{"title":"Synthesis of Power and Delay Optimized NIG structures","authors":"P. Balasubramanian, D. A. Edwards","doi":"10.1109/CCECE.2007.65","DOIUrl":"https://doi.org/10.1109/CCECE.2007.65","url":null,"abstract":"Structuring and mapping of a Boolean function is an important problem in the design of digital combinatorial circuits. Library aware constructive decomposition offers a solution to this problem. Compact multi-level representation of binary networks, based on simple circuit structures, such as AND-inverter graphs (AIG) [1] [5], NAND graphs, OR-inverter graphs (OIG), AND-XOR-inverter graphs, reduced Boolean circuits [8] does exist in literature. In this work, we discuss a novel efficient synthesis method for combinational logic circuits, represented using a NAND-inverter graph (NIG), which is composed of only two-input NAND (NAND2) and inverter (INV) cells. The networks are constructed on the basis of irredundant disjunctive normal forms, comprising terms with minimal cardinality. Construction of a NIG for a non-regenerative function in normal form would be straightforward, whereas for the opposite phase, it would be developed by considering a virtual instance of the function. However, the choice of best NIG for a given function would be based upon node count and cell count needed for actual implementation at the technology independent stage. We compare the power efficiency and delay improvement achieved by optimal NIGs over minimal AIGs and OIGs for some case studies. In comparison with functionally equivalent and redundant AIGs, NIGs report mean savings in power and delay of 33.76% and 18.57% respectively, after technology mapping with a 0.35 micron TSMC CMOS process. For a similar comparison with OIGs, NIGs demonstrate average savings in power and delay of 45.67% and 20.92% respectively.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129651747","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}
R. Harrison, Yuxiang Wu, H. Nguyen, Xiongmin Li, D. Gelowitz, C.W. Chan, P. Tontiwachwuthikul
{"title":"A Decision Support System for Filtering and Analysis of Carbon Dioxide Capture Data","authors":"R. Harrison, Yuxiang Wu, H. Nguyen, Xiongmin Li, D. Gelowitz, C.W. Chan, P. Tontiwachwuthikul","doi":"10.1109/CCECE.2007.347","DOIUrl":"https://doi.org/10.1109/CCECE.2007.347","url":null,"abstract":"This paper presents the development process of a decision support system for pre-filtering and analysis of data for the carbon dioxide (CO2) capture process. Chemical absorption is becoming one of the dominant CO2 capture technologies because of its efficiency and low cost. Since the chemical absorption process consists of dozens of components, it generates more than a hundred different types of data. Monitoring the vast amount of data can be complex, and data filtering and analysis processes are desirable. Specifically, invalid data captured as the equipment is started and shut down need to be filtered, and the filtered data need to be analyzed for different purposes. The data analysis support system not only filters out invalid data using different expert rules, but can also modify or reuse filtering settings, and export the filtered data to various file formats for further analysis. During development of the decision support system, knowledge acquisition was emphasized. The system was designed based on the model-view-control (MVC) design pattern. Source code management (SCM) software and strategy were applied to allow multiple developers to work together. Embedded database technology, Java event delivery techniques and extensible Markup Language (XML) were also included in development of the system.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130515894","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}
{"title":"Performace Evaluation of Similarity Metrics for Stereo Corresponce Problem","authors":"B. Khaleghi, S. Shahabi, A. Bidabadi","doi":"10.1109/CCECE.2007.397","DOIUrl":"https://doi.org/10.1109/CCECE.2007.397","url":null,"abstract":"Lately, many promising stereo matching algorithms mostly relying on global energy minimization framework have been proposed which model disparity surface as a MRF and deploy various optimization techniques to produce a MAP approximation of MRF model corresponding to minimum energy level of the matching cost function. However, most of these methods mainly concentrate on how to minimize the cost function rather than attempting to improve its definition. We believe that regarding all advances made recently in cost function optimization area and also deeming results of some new experiments proving that even calculating the globally optimal solutions of energy minimization using re-weighted belief propagation approach does not solve most of the problems associated with common BP or GC based methods, the next logical step for further improvement is to devise cost functions which are better trimmed to cope with stereo matching major inherent problems. In this paper, we illustrate the importance of well-defined cost functions by incorporating six similarity measures, namely, Manhattan (LI), Euclidean (L2), Canberra, Bray-Curtis, Squared Chord and Square Chi-Squared into matching cost function and comparing the obtainable results. To accomplish this, we apply the test data and ground truth supplied on Middlebury college stereo webpage. Finally, we analyze the obtained results and discuss its impact on the design of enhanced matching cost functions.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124197337","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}
{"title":"Mining Brain Tumors and Tracking their Growth Rates","authors":"A. Elamy, Maidong Hu","doi":"10.1109/CCECE.2007.222","DOIUrl":"https://doi.org/10.1109/CCECE.2007.222","url":null,"abstract":"Mining brain tumors and tracking their growth trends in the course of magnetic resonance imaging is an important task that assists medical professionals to describe the appropriate treatment. Nevertheless, applying conventional techniques to carry out this process manually is time-consuming and often unreliable and insufficiently accurate. Automating this process is a challenging task due to the fact of the fractal shape of tumor and its biological structure, which is often, has a high degree of intensity and textural similarity between normal areas and tumor tissues. Moreover, tumor uptake measurements are not easy given the small size of many tumors, the limitations of spatial resolution, and the change of tumor location from slice to slice across the brain. Furthermore, the arbitrary shape of tumors makes it extremely hard, if not impossible, to adopt traditional geometric rules for tumor measurements. In this paper, we present a computational approach for modeling and mining a large number of MRI data for patients with brain tumors. In this approach, we adopt a spatial data mining technique to extract useful information from MRI data in order to identify the size of tumors and growth trend, as well as classifying tumors of patients upon specific similarity measures.","PeriodicalId":183910,"journal":{"name":"2007 Canadian Conference on Electrical and Computer Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121208392","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}