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The Sensing Performance of Undoped-AlGaN/GaN/Sapphire HEMT Hydrogen Gas Sensor 未掺杂algan /GaN/蓝宝石HEMT氢气传感器的传感性能
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.184
M. Mohamad, Fong Yee Meng, A. M. Hashim
{"title":"The Sensing Performance of Undoped-AlGaN/GaN/Sapphire HEMT Hydrogen Gas Sensor","authors":"M. Mohamad, Fong Yee Meng, A. M. Hashim","doi":"10.1109/AMS.2008.184","DOIUrl":"https://doi.org/10.1109/AMS.2008.184","url":null,"abstract":"The hydrogen sensing characteristics of undoped- AlGaN/GaN/sapphire circular Schottky diodes are systematically studied and compared over wide hydrogen concentration and temperature ranges. High purity hydrogen gas was exposed to the sample together with the ambient gas of either air or pure nitrogen or without ambient gas (vacuum) at pressure in the range of 50 Torr to 200 Torr was used for both types of ambient gases. The sensing characteristics at different hydrogen concentration are investigated. The sensitivity to hydrogen gas was also investigated in dependence of various catalytic metals thickness and operating temperatures.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132305370","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
Analysis of Glitch Reconvergence in Combinational Logic SER Estimation 组合逻辑SER估计中的故障再收敛分析
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.166
Biwei Liu, Shuming Chen, Hu Xiao
{"title":"Analysis of Glitch Reconvergence in Combinational Logic SER Estimation","authors":"Biwei Liu, Shuming Chen, Hu Xiao","doi":"10.1109/AMS.2008.166","DOIUrl":"https://doi.org/10.1109/AMS.2008.166","url":null,"abstract":"Much effort has been made to estimate SER (Soft error rate) in combinational logic. However, little of them involve glitch reconvergence. In this paper, we discuss how to estimate SER in combinational logic when considering reconvergence. We present Boolean difference expressions for the sensitization condition of six reconvergence categories so that symbolic technique can be used to compute logical masking of reconvergence. We develop an equivalent glitch method so that STA (Static Timing Analysis) like pre- characterization method can be applied to compute electrical masking of reconvergence. Furthermore, latching window masking of reconvergence is discussed. Experiment results of ISCAS'85 benchmark circuit show that considering of reconvergence will cause overall 13.9% SER reduction. The time and memory cost of our method is moderate. And the average error of our method is 3.3% relative to SPICE.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128874941","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
Optimal Number of Replicas with QoS Assurance in Data Grid Environment 数据网格环境下具有QoS保证的最优副本数量
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.147
Y. Mansouri, R. Monsefi
{"title":"Optimal Number of Replicas with QoS Assurance in Data Grid Environment","authors":"Y. Mansouri, R. Monsefi","doi":"10.1109/AMS.2008.147","DOIUrl":"https://doi.org/10.1109/AMS.2008.147","url":null,"abstract":"Optimizing the use of grid resources is critical for users to effectively exploit a Data Grid (DG). Data replication is considered as a major technique for increasing access performance and data availability in DG systems. Current works on data replications in Grid systems focuses on infrastructure for replication mechanism for creating or deleting replicas. One of the challenges in data replication is determining Optimal Number of Replicas (ONR) with Quality of Service (QoS) assurance, as well as their Optimal Location of Replicas (OLR) in DG. In this paper, we propose an algorithm that finds ONR of an object over DG systems, such that the overall communication and storage cost is minimized. This algorithm ensures that QoS required from the users are satisfied. In addition, we proposed a sketch of the proof for our algorithm and its integrity.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115132415","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: 15
Image Quality Assessments and Restoration for Face Detection and Recognition System Images 人脸检测与识别系统图像质量评估与恢复
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.168
A. Zamani, M. K. Awang, Nazaruddin Omar, S. A. Nazeer
{"title":"Image Quality Assessments and Restoration for Face Detection and Recognition System Images","authors":"A. Zamani, M. K. Awang, Nazaruddin Omar, S. A. Nazeer","doi":"10.1109/AMS.2008.168","DOIUrl":"https://doi.org/10.1109/AMS.2008.168","url":null,"abstract":"In recent years face recognition has received substantial attentions from both research communities and the commercial, but remain challenging in real applications. One of the problems faced by face recognition system in real-time applications is the face image with poor quality conditions affecting the performance of the system especially in the face detection and face identification/verification phases. Quality problems observed such as shadows, hotspots, video artifacts, blurring, salt & pepper noise and movement blurring are common noises that affect the face recognition that uses Webcam as the image capturing device. This paper proposes a solution of how the image quality for the face recognition can be improved. Image quality assessment is introduced to measure the quality of signal during the image acquisition and image restoration is proposed to restore degraded image by certain noise.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123433378","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: 16
The Influence of Independent Scheduling Delay on Multi-Query Processing Based on Fork-Join 独立调度延迟对基于Fork-Join的多查询处理的影响
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.79
Yong Wang, Limei Jiao, Y. Liu, Huaiming Song
{"title":"The Influence of Independent Scheduling Delay on Multi-Query Processing Based on Fork-Join","authors":"Yong Wang, Limei Jiao, Y. Liu, Huaiming Song","doi":"10.1109/AMS.2008.79","DOIUrl":"https://doi.org/10.1109/AMS.2008.79","url":null,"abstract":"Fork-join is a basic query processing model in shared-nothing parallel database systems. A query Q is decomposed into a number of sub-queries, and each of which is processed independently on a processing element(PE), then all the results of sub-queries are \"joined\" and returned as Q's results. In this scheme, the query processing time of Q depends on the time of its last finished sub-query. Though it is very important, there are few works studied the performance of multi-query processing on Fork-join model. In this paper, we present a model, called CSD(coefficient of scheduling distance), to evaluate the influence of independent PE scheduling on the total completion time . All the experiments are conducted on DBroker, a large-scale production system for network security management. The experimental results show that the CSD model is accurate and effective.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128304196","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: 0
Towards Identifying Usability and Security Features of Graphical Password in Knowledge Based Authentication Technique 基于知识的身份验证技术中图形密码的可用性与安全性研究
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.136
M. Abdullah, A. Abdullah, N. Ithnin, H. K. Mammi
{"title":"Towards Identifying Usability and Security Features of Graphical Password in Knowledge Based Authentication Technique","authors":"M. Abdullah, A. Abdullah, N. Ithnin, H. K. Mammi","doi":"10.1109/AMS.2008.136","DOIUrl":"https://doi.org/10.1109/AMS.2008.136","url":null,"abstract":"Text-based passwords are ubiquitous authentication system. This traditional authentication system is well- known for its flaws in the aspects of usability and security issues that bring problems to users. Hence, there is a need for alternative mechanism to overcome these problems. Graphical passwords, which consist of clicking or dragging activities on the pictures rather than typing textual characters, might be the option to overcome the problems that arise from the text-based passwords system. In this paper, a comprehensive study of the existing graphical password schemes is performed. We compared and categorized these schemes into two groups; recognition-based scheme and recall-based scheme. We also list out several usability and security features for research continuity in this area.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128290177","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: 92
Improved Interleaving Technique for PAPR Reduction in OFDM-MIMO System OFDM-MIMO系统中降低PAPR的改进交错技术
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.52
P. Malathi, P. Vanathi
{"title":"Improved Interleaving Technique for PAPR Reduction in OFDM-MIMO System","authors":"P. Malathi, P. Vanathi","doi":"10.1109/AMS.2008.52","DOIUrl":"https://doi.org/10.1109/AMS.2008.52","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is of great interest for researchers and research laboratories all over the world. OFDM is widely used in contemporary communication systems for its good robustness in multipath environment, and its high spectral efficiency. The capacity of wireless system can be increased dramatically by employing multiple input multiple output, (MIMO) antennas. The combination of MIMO and OFDM system is found to be very beneficial. A major drawback of OFDM-MIMO system is its high peak to average power ratio (PAPR) Reduction. The peak power of a signal is a critical design factor for band limited communication systems, and it is necessary to reduce it as much as possible. Here a modified Interleaving PAPR reduction technique is proposed. The proposed technique for PAPR reduction gives an improvement over the existing technique at a cost of negligible decrease in the data rate.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128606014","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: 6
Collaborative Wireless Information Granulation Architecture 协同无线信息粒化体系结构
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.126
E. Peytchev, Ismail Kucukdurgut
{"title":"Collaborative Wireless Information Granulation Architecture","authors":"E. Peytchev, Ismail Kucukdurgut","doi":"10.1109/AMS.2008.126","DOIUrl":"https://doi.org/10.1109/AMS.2008.126","url":null,"abstract":"As we move further into the age of machine intelligence and automated reasoning, one daunting problem becomes harder and harder to master. The problem is - how can we cope with the explosive growth in data, information, and knowledge? How can we locate and infer from decision- relevant information that is embedded in a large database that is unstructured, imprecise, and not totally reliable. [Zadeh] This paper introduces an architecture which is design to start offering solutions to some of these problems. The architecture is based on wireless connectivity mobile network where the participants collaboratively.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129292701","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: 0
Towards Identifying Features of Trust in Mobile Ad Hoc Network 移动Ad Hoc网络中信任特征识别研究
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.113
Normalia Samian, M. A. Maarof, S. Razak
{"title":"Towards Identifying Features of Trust in Mobile Ad Hoc Network","authors":"Normalia Samian, M. A. Maarof, S. Razak","doi":"10.1109/AMS.2008.113","DOIUrl":"https://doi.org/10.1109/AMS.2008.113","url":null,"abstract":"In a mobile ad hoc network (MANET) where security is a crucial issue, trust plays an important factor that could improve the number of successful data transmission process. The higher the numbers of nodes that trust each other in the network means the higher successful communication process rates could be expected. To determine trust, there are several criteria need to be considered. These criteria which are also known as features or evidences can be used to represent each node's trust properties in the trust evaluation process prior to initiating certain packet forwarding task. Nodes that are able to present valid features requested by source node will be included in the MANET operations. The aim of this paper is to provide an overview of security vulnerabilities in MANET and the use of trust concept to enhance the security. This paper also discusses several potential features that have been used in existing works which are expected to be suitable to be used in the trust evaluation process to create a trusted MANET community.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132412333","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: 8
Estimation of Evapotranspiration with Modified SEBAL Model Using Landsat-TM and NOAA-AVHRR Images in Arid Mountains Area 基于Landsat-TM和NOAA-AVHRR影像的改进SEBAL模型估算干旱区蒸散发
2008 Second Asia International Conference on Modelling & Simulation (AMS) Pub Date : 2008-05-13 DOI: 10.1109/AMS.2008.42
A. Almhab, I. Busu
{"title":"Estimation of Evapotranspiration with Modified SEBAL Model Using Landsat-TM and NOAA-AVHRR Images in Arid Mountains Area","authors":"A. Almhab, I. Busu","doi":"10.1109/AMS.2008.42","DOIUrl":"https://doi.org/10.1109/AMS.2008.42","url":null,"abstract":"This study examines the method for determining surface energy namely surface energy balance algorithm for land (SEBAL). This particular method utilized the combination of meteorological observations with information extracted from remote sensing data. The modified SEBAL model using data from Landsat TM and NOAA-AVHRR sensors, has been used to estimate net radiation, soil heat flux, sensible heat flux and ETfor Sana'a Basin in Yemen. The area is known for arid and semi-arid weather condition with undulating topographic. Remote sensing data for year 95, 96 and 1998 were used as a primary image for this study. Actual ET was computed during satellite overpass and integrated for 24-h on pixel-by-pixel basis for daily ET distribution. Due to the topographic effects, an attempt has also been made to incorporated DEM information for estimating the net radiation. As a result, a daily ET map generated from metrological observation was compared with estimated ET data simulated from remote sensing data. In conclusion, data from both remote sensing give reasonable values with result from TM are better compare to those of AVHRR due to difference in spatial resolution, which TM data a higher spatial resolution than AVHRR.","PeriodicalId":122964,"journal":{"name":"2008 Second Asia International Conference on Modelling & Simulation (AMS)","volume":"1990 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130885986","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: 9
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