Pub Date : 2011-12-29DOI: 10.1109/AHICI.2011.6113939
Tapas K. Das, Alokekumar Das, Avranil Das
The low cost solar power requiring for mobile transmitter/receiver tower antennas in remote areas with low traffic density and other uses in village sites, is developed. The power provides coverage to large areas having the mega cells presenting radii in the range of 100–500 km. The solar cell assembly parameters considering the top glass plate, thickness of the EVA film, back cover material, and the processing control parameters of the laminated equipment considering the temperature and duration of curing of the EVA film, vacuum pressure, are taken to obtain maximum power output in the flat panel Photovoltaic (PV) module. The line-focused solar-cell concentrator was used to reduce the cost of the PV module as concentrating the light is significantly less expensive than the cost of flat-pate module. The decrease of output power was measured by increasing the temperature of the solar cell strings. Air-cooled heat sink was used to cool the cells and the temperature variation was obtained by changing fin area and wind speed. The optimum condition related to the assembly and processing parameters of the solar cell module to obtain maximum power is shown.
{"title":"Solar power of mobile transmitter/receiver tower antennas in remote areas","authors":"Tapas K. Das, Alokekumar Das, Avranil Das","doi":"10.1109/AHICI.2011.6113939","DOIUrl":"https://doi.org/10.1109/AHICI.2011.6113939","url":null,"abstract":"The low cost solar power requiring for mobile transmitter/receiver tower antennas in remote areas with low traffic density and other uses in village sites, is developed. The power provides coverage to large areas having the mega cells presenting radii in the range of 100–500 km. The solar cell assembly parameters considering the top glass plate, thickness of the EVA film, back cover material, and the processing control parameters of the laminated equipment considering the temperature and duration of curing of the EVA film, vacuum pressure, are taken to obtain maximum power output in the flat panel Photovoltaic (PV) module. The line-focused solar-cell concentrator was used to reduce the cost of the PV module as concentrating the light is significantly less expensive than the cost of flat-pate module. The decrease of output power was measured by increasing the temperature of the solar cell strings. Air-cooled heat sink was used to cool the cells and the temperature variation was obtained by changing fin area and wind speed. The optimum condition related to the assembly and processing parameters of the solar cell module to obtain maximum power is shown.","PeriodicalId":371011,"journal":{"name":"2011 Second Asian Himalayas International Conference on Internet (AH-ICI)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133915709","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 : 2011-12-29DOI: 10.1109/AHICI.2011.6113945
S. Bhirud, V. Katkar
With increase in densities of semiconductor chips and decrease in cost, it is feasible to store huge amount of data in main memory. Main Memory Database Management System (MMDBMS) uses main memory as primary storage for huge amount of data and provides very high speed access to it. This makes MMDBMS suitable option for implementation of real-time network security systems. This paper presents light-weight mechanism for detection and prevention of SYN flood attack using MMDBMS. Experimental results are provided to support proposed mechanism.
{"title":"SYN flood attack prevention using main-memory database management system","authors":"S. Bhirud, V. Katkar","doi":"10.1109/AHICI.2011.6113945","DOIUrl":"https://doi.org/10.1109/AHICI.2011.6113945","url":null,"abstract":"With increase in densities of semiconductor chips and decrease in cost, it is feasible to store huge amount of data in main memory. Main Memory Database Management System (MMDBMS) uses main memory as primary storage for huge amount of data and provides very high speed access to it. This makes MMDBMS suitable option for implementation of real-time network security systems. This paper presents light-weight mechanism for detection and prevention of SYN flood attack using MMDBMS. Experimental results are provided to support proposed mechanism.","PeriodicalId":371011,"journal":{"name":"2011 Second Asian Himalayas International Conference on Internet (AH-ICI)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132810344","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 : 2011-12-29DOI: 10.1109/AHICI.2011.6113957
A. Tiwari, Suresh Jain, A. Mishra
Many applications are using Geographical Information Systems (GIS) to find the information by using Spatial Queries on specified Spatial Database. The result of these traditional queries can be improved by inclusion of fuzzy techniques. This paper describes the improvement in result by traditional queries by use of fuzzy techniques. The commonly used adjectives can be embedded to queries to give them natural wordings so that any person can understand and use it easily. These wordings are defined mathematically as per the situation and accordingly calculation is done using fuzzy techniques. The results so found are better than the conventional one. For example the traditional query is like “Find the Medical Aid with in 1 KM around Point P”. The deficiency in this query is that it will yield the result after matching exactly 1 kilometer around Point P. There is possibility that any important Medical Aid is missing which is 1.1 kilometer apart. To improve result query can be modified like “Find the Medical Aid Near by 1 KM around Point P”. By using fuzzy techniques we can improve the query and get the better results. This paper is an approach towards such techniques.
{"title":"Improvement in spatial queries by using fuzzy control system in spatial measurement","authors":"A. Tiwari, Suresh Jain, A. Mishra","doi":"10.1109/AHICI.2011.6113957","DOIUrl":"https://doi.org/10.1109/AHICI.2011.6113957","url":null,"abstract":"Many applications are using Geographical Information Systems (GIS) to find the information by using Spatial Queries on specified Spatial Database. The result of these traditional queries can be improved by inclusion of fuzzy techniques. This paper describes the improvement in result by traditional queries by use of fuzzy techniques. The commonly used adjectives can be embedded to queries to give them natural wordings so that any person can understand and use it easily. These wordings are defined mathematically as per the situation and accordingly calculation is done using fuzzy techniques. The results so found are better than the conventional one. For example the traditional query is like “Find the Medical Aid with in 1 KM around Point P”. The deficiency in this query is that it will yield the result after matching exactly 1 kilometer around Point P. There is possibility that any important Medical Aid is missing which is 1.1 kilometer apart. To improve result query can be modified like “Find the Medical Aid Near by 1 KM around Point P”. By using fuzzy techniques we can improve the query and get the better results. This paper is an approach towards such techniques.","PeriodicalId":371011,"journal":{"name":"2011 Second Asian Himalayas International Conference on Internet (AH-ICI)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121926144","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 : 2011-11-01DOI: 10.1109/AHICI.2011.6113954
P. Baracca, S. Tomasin, N. Benvenuto
The deployment of relays has been recognized as a valid way to increase spectral efficiency and coverage in wireless systems. In this work we consider a network where no communication is allowed from the source to the destination and transmission is performed only with the assistance of three relays operating in half-duplex mode. Moreover, time is divided in two phases and only one relay is transmitting during odd phases, while the other two are transmitting during even phases. The two relays transmit signals belonging to different scaled and rotated QAM constellations. However, in order to simplify the receiver, the two signals combine through the channels to a symbol belonging to a larger QAM constellation. Then, we develop a practical algorithm to perform power and time-sharing optimization in order to maximize spectral efficiency. Numerical results show that our proposal outperforms the scenario where cooperative relays employ the classical adaptive decode-and-forward and indeed approaches the spectral efficiency obtained when relays employ Slepian-Wolf encoding.
{"title":"Power and time-sharing optimization for three half-duplex relay networks","authors":"P. Baracca, S. Tomasin, N. Benvenuto","doi":"10.1109/AHICI.2011.6113954","DOIUrl":"https://doi.org/10.1109/AHICI.2011.6113954","url":null,"abstract":"The deployment of relays has been recognized as a valid way to increase spectral efficiency and coverage in wireless systems. In this work we consider a network where no communication is allowed from the source to the destination and transmission is performed only with the assistance of three relays operating in half-duplex mode. Moreover, time is divided in two phases and only one relay is transmitting during odd phases, while the other two are transmitting during even phases. The two relays transmit signals belonging to different scaled and rotated QAM constellations. However, in order to simplify the receiver, the two signals combine through the channels to a symbol belonging to a larger QAM constellation. Then, we develop a practical algorithm to perform power and time-sharing optimization in order to maximize spectral efficiency. Numerical results show that our proposal outperforms the scenario where cooperative relays employ the classical adaptive decode-and-forward and indeed approaches the spectral efficiency obtained when relays employ Slepian-Wolf encoding.","PeriodicalId":371011,"journal":{"name":"2011 Second Asian Himalayas International Conference on Internet (AH-ICI)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130719785","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 : 2011-11-01DOI: 10.1109/AHICI.2011.6159575
R. Paudel, Zabih Ghassemlooy, H. Le‐Minh, S. Rajbhandari, B. Livingstone
In this work, a free space optical (FSO) communication link for the ground-to-train system is experimentally demonstrated in the laboratory environment. The system can be used to provide high speed broadband services on fast moving trains. A line of sight (LOS) FSO communications link is presented and the measured Q-factor performance along the rail track for the prototype system is given. A downlink communication over a short link length is successfully demonstrated.
{"title":"Investigation of FSO ground-to-train communications in a laboratory environment","authors":"R. Paudel, Zabih Ghassemlooy, H. Le‐Minh, S. Rajbhandari, B. Livingstone","doi":"10.1109/AHICI.2011.6159575","DOIUrl":"https://doi.org/10.1109/AHICI.2011.6159575","url":null,"abstract":"In this work, a free space optical (FSO) communication link for the ground-to-train system is experimentally demonstrated in the laboratory environment. The system can be used to provide high speed broadband services on fast moving trains. A line of sight (LOS) FSO communications link is presented and the measured Q-factor performance along the rail track for the prototype system is given. A downlink communication over a short link length is successfully demonstrated.","PeriodicalId":371011,"journal":{"name":"2011 Second Asian Himalayas International Conference on Internet (AH-ICI)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116065916","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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