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2017 28th Irish Signals and Systems Conference (ISSC)最新文献

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Maximising the efficiency of a Class-D audio amplifier output stage 最大化d类音频放大器输出级的效率
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983642
R. Bakker, M. Duffy
{"title":"Maximising the efficiency of a Class-D audio amplifier output stage","authors":"R. Bakker, M. Duffy","doi":"10.1109/ISSC.2017.7983642","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983642","url":null,"abstract":"This paper investigates different methods for improving the power efficiency of Class-D audio amplifier output stages. A standard half-bridge design is analysed and the effects of using Gallium Nitride (GaN) and Silicon Carbide (SiC) devices are considered. A new 2-phase interleaved output stage is proposed, and the advantages of this are discussed. The effect of the output low-pass filter parameters on power loss is also analysed. Simulation results of power efficiency of all of the proposed designs are presented. It is concluded that there is significant room to improve on the standard half-bridge Class-D amplifier design.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121628821","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
Performance limits for open-loop fractional dividers 开环分数分法器的性能限制
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983612
Stefano Tulisi, Michael Peter Kennedy
{"title":"Performance limits for open-loop fractional dividers","authors":"Stefano Tulisi, Michael Peter Kennedy","doi":"10.1109/ISSC.2017.7983612","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983612","url":null,"abstract":"The architecture of an Open-loop fractional divider is presented comparing the performance using different orders of DDSM to implement the Phase Error Calculator block. We show that the performance of the output clock is unconnected from the order of the DDSM and that consequently the first order structure is the most suitable for the implementation in a real device.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131064325","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
Integrated sensors kit for investigation of perishable produce shelf-life extension 用于易腐产品保质期延长调查的集成传感器套件
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983627
P. Moriarty, P. Doody
{"title":"Integrated sensors kit for investigation of perishable produce shelf-life extension","authors":"P. Moriarty, P. Doody","doi":"10.1109/ISSC.2017.7983627","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983627","url":null,"abstract":"This paper details the process of designing, testing and developing an integrated sensors kit for recording a range of environmental parameters within a newly developed transportation unit called FreshBox. It has been designed to extend product shelf life as well as other improvements on conventional food storage and transportation. The sensors kit is transported within the FreshBox container and monitors the ambient environmental features to which the produce is exposed. CO2, O2, temperature and humidity levels are all recorded locally on a memory card and uploaded to the cloud at a later stage via a smart phone app. The unit has been tested during transportation of fresh fruit and vegetables between Spain and Germany.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122846072","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
Social dogfood: A framework to minimise clouc field defects through crowd sourced testing 社交狗食:通过众包测试最小化云场缺陷的框架
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983605
David Malone, J. Dunne
{"title":"Social dogfood: A framework to minimise clouc field defects through crowd sourced testing","authors":"David Malone, J. Dunne","doi":"10.1109/ISSC.2017.7983605","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983605","url":null,"abstract":"Delivering software for the Cloud represents a challenge for both micro teams and Small Medium Enterprises (SMEs), in part due to the rapid release methods adopted and the numerous ways in which software defects can be detected. We study field defect detection rates in a framework where these rates are used to refocus in-house test resources. Using an enterprise dataset, we address the question of what types of defects are found in the field and how soon after a system goes live defects are detected. Our framework can aid both micro teams and SMEs to minimise the number of defects found in the field by maximising internal usage through ‘Dogfood’ programs and by leveraging crowdsourced test methodologies.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131888871","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
Speech intelligibility and quality: A comparative study of speech enhancement algorithms 语音清晰度和语音质量:语音增强算法的比较研究
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983599
Michael Russell, R. Flynn, Xiaodong Xu
{"title":"Speech intelligibility and quality: A comparative study of speech enhancement algorithms","authors":"Michael Russell, R. Flynn, Xiaodong Xu","doi":"10.1109/ISSC.2017.7983599","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983599","url":null,"abstract":"Mobile devices are widely used today for speech communication. The environments in which these devices are used are widely varied and often the level of background noise in the speaker's environment can be significant. The purpose of speech enhancement is to reduce the level of background noise, ideally to such a level that it is not noticed by the listener. While speech enhancement algorithms can significantly reduce the noise level in a speech signal, improving speech quality, it is widely recognized that enhancement algorithms can have a negative impact on speech intelligibility. This paper compares the effect of three different speech enhancement algorithms on the intelligibility and the quality of speech. This work is the initial phase of an investigation into mitigating the impact of speech enhancement algorithms on speech intelligibility. The speech enhancement algorithms evaluated each use different approaches for noise reduction, namely, a statistical model-based algorithm, a noise estimation algorithm and a wavelet packet decomposition-based algorithm. Two objective speech intelligibility measurements and three objective speech quality measurements are used to assess the performance of the enhancement algorithms. The results of the experiments show that all the speech enhancement algorithms in this study have a negative impact on speech intelligibility to varying degrees.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711830","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
Digital certificate-based port knocking for connected embedded systems 用于连接嵌入式系统的基于数字证书的端口敲门
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983645
Basim Mahbooba, M. Schukat
{"title":"Digital certificate-based port knocking for connected embedded systems","authors":"Basim Mahbooba, M. Schukat","doi":"10.1109/ISSC.2017.7983645","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983645","url":null,"abstract":"The Internet of Things (IoT) is more vulnerable to targeted cyber-attacks than an ordinary Information Technology (IT) infrastructure, where these cyber-attacks operate on subsequent identification (i.e., port scan and exploitation of device's vulnerabilities). Port scans can be rendered useless by applying Port Knocking (PK) as information is transmitted across closed network ports by using a common secret, a device firewall hides all ports from the outside world by filtering (PK) network packets (i.e. TCP connection requests). A secure approach to authenticate IOT devices on the network is required as the current PK approaches (e.g. one time password) suffer from security issues such as sharing secrets. Therefore, this research aims to reinforce existing port knocking methods with a digital certificate for alternative authentication among IoT devices. Such concepts will be complementary to other cryptographic concepts (i.e. shared encryption keys as adopted in ZigBee).","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132741741","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
Performance modelling of a small-scale wind and solar energy hybrid system 小型风能和太阳能混合系统的性能建模
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983616
Zhengnan Cao, Fergal O'Rourke, W. Lyons
{"title":"Performance modelling of a small-scale wind and solar energy hybrid system","authors":"Zhengnan Cao, Fergal O'Rourke, W. Lyons","doi":"10.1109/ISSC.2017.7983616","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983616","url":null,"abstract":"Wind and solar energy have become very popular options for energy conversion over the past years. This is particularly true for wind energy which is experiencing significant growth year-on-year. A significant part of this growth is at large-scale commercial power systems. However, there is a growing interest in small-scale renewable energy technologies to capture this intermittent but plentiful resource. A combined wind and solar energy hybrid system utilises two renewable energy resources, in doing so diversifies supply and as a result will make the system power output more stable and continuous. In this paper the details of the hybrid system model, using Matlab Simulink, are given. The model developed, is discussed giving key details on the characteristics of each part of the wind and solar energy hybrid system. The hybrid system model developed includes four subsystems: the solar energy subsystem, the wind energy subsystem, the inverter subsystem, the battery storage subsystem. The renewable energy resource is converted, using the wind turbine and photovoltaic panels to AC, via an inverter, which supplies the load. Any surplus energy is stored in the battery. It was found, from the simulation that the maximum power can be obtained under different circumstances using the developed maximum power point tracking algorithm.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132948795","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
Neural networks to aid the autonomous landing of a UAV on a ship 帮助无人机在船上自主着陆的神经网络
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983613
P. Moriarty, R. Sheehy, P. Doody
{"title":"Neural networks to aid the autonomous landing of a UAV on a ship","authors":"P. Moriarty, R. Sheehy, P. Doody","doi":"10.1109/ISSC.2017.7983613","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983613","url":null,"abstract":"This paper proposes to examine the possible uses of Artificial Neural Networks (ANN) to aid the landing of an Unmanned Aerial Vehicle (UAV) on a ship. Three distinct phases are proposed. The dataset required for training and testing was produced by simulating a ship's motion at sea using Unity. Phase 1 converts video images from a UAV on-board camera to numeric data. Phase 2 utilizes Phase 1 data and calculates the current relative orientation and distance of the UAV to the landing platform. Co-ordinate pairs representing screen positions of particular areas of a ship's landing pad were normalized and used to train the Phase 2 ANN. Orientation has been calculated to an accuracy of +/−1% and distance +/−2%. Phase 3 determines future landing windows. Phase 3 uses the orientations produced in Phase 2 and calculates future periods when a landing, within a time limit, could be attempted. This paper proposes strategies and current research into Phases 1, 2 and 3 and suggests development of an indicator of optimal landing times for Manned Aerial Vehicles (MAV).","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133011707","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: 19
Low power IoT platform for vital signs monitoring 用于生命体征监测的低功耗物联网平台
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983641
Simon Coulter, M. Mostes, G. Lightbody, E. Popovici, W. Fennell
{"title":"Low power IoT platform for vital signs monitoring","authors":"Simon Coulter, M. Mostes, G. Lightbody, E. Popovici, W. Fennell","doi":"10.1109/ISSC.2017.7983641","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983641","url":null,"abstract":"Recent years have witnessed tremendous advances in wearable technology with many applications ranging from health and fitness, sports, security, and more recently augmented reality. Classical body area networks have been reduced to small, wearable devices such as smart watches where signal acquisition is accompanied by processing or streaming to a more powerful device such as a smart phone (or “fog”), or directly to the Cloud. We present a system based around EPIC electric potential sensors which are capable of acquiring bio-electric signals, including an electrocardiogram-like signal (ECG). The paper compares a set of validation algorithms for the extraction of Heart Rate (HR) and Respiratory Rate (RR) suitable for use on EPIC sensor data acquired with the proposed system. These algorithms are evaluated in terms of precision and the estimated robustness and variance. The system is of particular relevance in the field of Augmented and Virtual Reality, in which such a miniaturised, wireless platform becomes a necessity [1].","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126100124","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
Evaluating password advice 评估密码建议
2017 28th Irish Signals and Systems Conference (ISSC) Pub Date : 2017-06-01 DOI: 10.1109/ISSC.2017.7983609
Hazel Murray, David Malone
{"title":"Evaluating password advice","authors":"Hazel Murray, David Malone","doi":"10.1109/ISSC.2017.7983609","DOIUrl":"https://doi.org/10.1109/ISSC.2017.7983609","url":null,"abstract":"Password advice is constantly circulated by standards agencies, companies, websites and specialists. But there appears to be great diversity in terms of the advice that is given. Users have noticed that different websites are enforcing different restrictions. For example, requiring different combinations of uppercase and lowercase letters, numbers and special characters. We collected password advice and found that the advice distributed by one organization can directly contradict advice given by another. Our paper aims to illuminate interesting characteristics for a sample of the password advice distributed. We also create a framework for identifying the costs associated with implementing password advice. In doing so we identify a reason for why password advice is often both derided and ignored.","PeriodicalId":170320,"journal":{"name":"2017 28th Irish Signals and Systems Conference (ISSC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130037436","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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