Pub Date : 2018-10-01DOI: 10.23919/RADIO.2018.8572302
P. Sowa, Karolina Sieroń, G. Cieślar, A. Sieroń
In this paper the potentially harmful impact of electromagnetic field generated by mobile phone $(mathbf{f}=mathbf{900 MHz})$ on the prooxidant/antioxidant balance in frontal brain cortex of male rats was estimated by means of analysis of the contents of markers of oxidative stress and membrane lipid peroxidation, as well as the activity of selected antioxidant enzymes. It was concluded that 4-week lasting exposure (4 minutes daily) of rats to electromagnetic field with physical parameters generated by such mobile phone causes in frontal brain cortex an increase in intensity of the process of membrane lipids peroxidation without stimulation of oxidative stress, with accompanying compensatory decrease in the activity of most of analyzed antioxidant enzymes except of catalase, probably due to excessive consumption.
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Pub Date : 2018-10-01DOI: 10.23919/RADIO.2018.8572483
Evan O'Keeffe, Adam S. Moore, E. Mangina
Two main challenges face humanitarian rescue organisations during disaster events (a) gathering ground level intelligence of damage and required actions; (b) re-establishment of communications to aid coordination and allow people to alert their needs and position. Mobile phones may stop working during a disaster due to loss of core infrastructure or lack of capacity leading to a loss of communication for the vulnerable or those in need of help. First responders are also unable to relay information back to the Communication control. Re-establishment of communication is therefore critical and can be achieved through hotspot creation with ad-hoc drone networking. This paper investigates and evaluates different possible solutions: (a) Serval Mesh developed in partnership with the New Zealand Red Cross, allowing smart-phones to communicate; (b) Open Garden, which shares Internet connections between laptops, tablets and phones in a similar way to WiFi hotspots and (c) Software Defined Radio (SDR) with base transceiver station software for user triangulation through Global System For Mobile Communications (GSM). Communications have followed the World Radio Communication Conference (WRC) guidelines for terrestrial and satellite links.
在灾难事件中，人道主义救援组织面临两个主要挑战:(a)收集地面上的损害情报和所需的行动;(b)重建通讯，以协助协调工作，并使人民了解他们的需要和处境。在灾难期间，由于核心基础设施的丧失或容量不足，移动电话可能会停止工作，从而导致弱势群体或需要帮助的人失去通信。急救人员也无法将信息传回通信控制中心。因此，重新建立通信是至关重要的，可以通过使用自组织无人机网络创建热点来实现。本文调查和评估了不同的可能解决方案:(a)与新西兰红十字会合作开发的几个Mesh，允许智能手机进行通信;(b) Open Garden，以类似于WiFi热点的方式在笔记本电脑、平板电脑和手机之间共享互联网连接;(c)软件定义无线电(SDR)，通过全球移动通信系统(GSM)使用基站收发器软件进行用户三角测量。通信遵循了世界无线电通信会议关于地面和卫星链路的准则。
{"title":"Drone-based Re-establishment of Communications for Humanitarian Rescue Organisations","authors":"Evan O'Keeffe, Adam S. Moore, E. Mangina","doi":"10.23919/RADIO.2018.8572483","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572483","url":null,"abstract":"Two main challenges face humanitarian rescue organisations during disaster events (a) gathering ground level intelligence of damage and required actions; (b) re-establishment of communications to aid coordination and allow people to alert their needs and position. Mobile phones may stop working during a disaster due to loss of core infrastructure or lack of capacity leading to a loss of communication for the vulnerable or those in need of help. First responders are also unable to relay information back to the Communication control. Re-establishment of communication is therefore critical and can be achieved through hotspot creation with ad-hoc drone networking. This paper investigates and evaluates different possible solutions: (a) Serval Mesh developed in partnership with the New Zealand Red Cross, allowing smart-phones to communicate; (b) Open Garden, which shares Internet connections between laptops, tablets and phones in a similar way to WiFi hotspots and (c) Software Defined Radio (SDR) with base transceiver station software for user triangulation through Global System For Mobile Communications (GSM). Communications have followed the World Radio Communication Conference (WRC) guidelines for terrestrial and satellite links.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131442627","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}
Pub Date : 2018-10-01DOI: 10.23919/RADIO.2018.8572443
J. Dobes, J. Míchal, S. Banas
The semisymbolic analysis generally requires meticulous algorithms from the point of view of accuracy of resulting poles and zeros, especially in the case of huge differences among their absolute values. In the paper, an optimal pivoting strategy is suggested for the algorithm which reduces general eigenvalue problem to the standard one in the case of both full- and sparse-matrix procedures. Using the pivoting, the precision of the poles and zeros increases considerably. However, it is still insufficient for a number of tasks, especially for radio frequency circuits where the poles and zeros are spread over many decades of magnitudes. As contemporary compilers of C++ and Fortran languages have built-in quad precision libraries, it is possible to further enhance the semisymbolic-analysis accuracy using this 128-bit arithmetics.
{"title":"Accurate Semisymbolic Analysis with Usage of 128-bit Arithmetics","authors":"J. Dobes, J. Míchal, S. Banas","doi":"10.23919/RADIO.2018.8572443","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572443","url":null,"abstract":"The semisymbolic analysis generally requires meticulous algorithms from the point of view of accuracy of resulting poles and zeros, especially in the case of huge differences among their absolute values. In the paper, an optimal pivoting strategy is suggested for the algorithm which reduces general eigenvalue problem to the standard one in the case of both full- and sparse-matrix procedures. Using the pivoting, the precision of the poles and zeros increases considerably. However, it is still insufficient for a number of tasks, especially for radio frequency circuits where the poles and zeros are spread over many decades of magnitudes. As contemporary compilers of C++ and Fortran languages have built-in quad precision libraries, it is possible to further enhance the semisymbolic-analysis accuracy using this 128-bit arithmetics.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129746358","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}
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