Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712860
Y. Varthamanan, V. Kannan
Carbon Nanotube Field Effect Transistors (CNTFET) are promising nano-scaled devices for implementing high performance, very dense and low power circuits. The core of a CNTFET is a carbon nanotube. Its conductance property is determined by the so-called chirality of the tube; chirality is difficult to control during manufacturing. This results in conducting (metallic) nanotubes and defective CNTFETs similar to stuck-on (SON or source-drain short)faults, as encountered in classical MOS devices. This paper studies this phenomenon by using layout information and presents modeling. For CNTFET-based circuits (e.g. intramolecular), these defects are analyzed using a traditional stuck-at fault model. This analysis is applicable to primitive and complex gates. In this paper, we have also developed a simple analytical model for ballistic nano transistors that operate by modulating the charge in the device (as opposed to modulating the current at the contact). This analytical model captures the essential physics of MOSFET-like ballistic[10] nanotransistors and provides a convenient way to assess and compare transistors at the ballistic limit. The circuit simulation was carried out using SPICE model and the current voltage characteristics were obtained.
{"title":"Current voltage characteristics of Carbon Nano Tube Field Effect Transistor","authors":"Y. Varthamanan, V. Kannan","doi":"10.1109/RSTSCC.2010.5712860","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712860","url":null,"abstract":"Carbon Nanotube Field Effect Transistors (CNTFET) are promising nano-scaled devices for implementing high performance, very dense and low power circuits. The core of a CNTFET is a carbon nanotube. Its conductance property is determined by the so-called chirality of the tube; chirality is difficult to control during manufacturing. This results in conducting (metallic) nanotubes and defective CNTFETs similar to stuck-on (SON or source-drain short)faults, as encountered in classical MOS devices. This paper studies this phenomenon by using layout information and presents modeling. For CNTFET-based circuits (e.g. intramolecular), these defects are analyzed using a traditional stuck-at fault model. This analysis is applicable to primitive and complex gates. In this paper, we have also developed a simple analytical model for ballistic nano transistors that operate by modulating the charge in the device (as opposed to modulating the current at the contact). This analytical model captures the essential physics of MOSFET-like ballistic[10] nanotransistors and provides a convenient way to assess and compare transistors at the ballistic limit. The circuit simulation was carried out using SPICE model and the current voltage characteristics were obtained.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117175094","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712883
V. Sivakumar, V. Rajendran
Underwater ambient noise consist of many signals generated by both natural and man made sources. These signals are spread over a wide range of frequencies. Thus, analysis and classification of the various components of ambient noise is an essential step in the process of de-noising underwater acoustic signals. This place a major role in the improvement of signal to noise ratio, which is an important characteristic of marine instruments. This paper investigates the effect noise spectrum over a different wind speed and the signal coherence with sensor separation are examined for a number of line array processor in the pacific ocean region. To clarify the effect of sensor separation on the noise field, the relatively simple case of a semi infinite ocean with Isovelocity profile is considered.
{"title":"Analyze the coherence of ambient noise in the bay of bengal ocean region","authors":"V. Sivakumar, V. Rajendran","doi":"10.1109/RSTSCC.2010.5712883","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712883","url":null,"abstract":"Underwater ambient noise consist of many signals generated by both natural and man made sources. These signals are spread over a wide range of frequencies. Thus, analysis and classification of the various components of ambient noise is an essential step in the process of de-noising underwater acoustic signals. This place a major role in the improvement of signal to noise ratio, which is an important characteristic of marine instruments. This paper investigates the effect noise spectrum over a different wind speed and the signal coherence with sensor separation are examined for a number of line array processor in the pacific ocean region. To clarify the effect of sensor separation on the noise field, the relatively simple case of a semi infinite ocean with Isovelocity profile is considered.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117250486","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712872
Beulah Jackson, T. Jayanthy
Water pollution is one of the severe problems that have a crippling effect on public hygiene. The detection of impurities present in the water is of high priority to battle its effects. In this paper, we propose a novel method to perform detection of such impurities by exploiting the dielectric constant variations caused by its presence. We present a microstrip resonator that measures the dielectric constant (relative permittivity) of the water by means of variation in resonant frequency. The design makes use of Defected ground structure (DGS) for enhanced resonance. The electromagnetic field distribution, resonant frequency and quality factor of the design are computed and analyzed. The microstrip resonator presented here has some virtues such as simple structure, easy manufacture, low cost etc. The resonator has been simulated using HFSS 9.
{"title":"A novel method for water impurity concentration using microstrip resonator sensor","authors":"Beulah Jackson, T. Jayanthy","doi":"10.1109/RSTSCC.2010.5712872","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712872","url":null,"abstract":"Water pollution is one of the severe problems that have a crippling effect on public hygiene. The detection of impurities present in the water is of high priority to battle its effects. In this paper, we propose a novel method to perform detection of such impurities by exploiting the dielectric constant variations caused by its presence. We present a microstrip resonator that measures the dielectric constant (relative permittivity) of the water by means of variation in resonant frequency. The design makes use of Defected ground structure (DGS) for enhanced resonance. The electromagnetic field distribution, resonant frequency and quality factor of the design are computed and analyzed. The microstrip resonator presented here has some virtues such as simple structure, easy manufacture, low cost etc. The resonator has been simulated using HFSS 9.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130662780","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712811
N. Karthikeyan, M. C. Shashikkumar, J. Ramanamurthy
Vegetation is a complex phenomenon with large amount of inherent spectral, spatial and temporal variability and it is typically characterized by strong absorption in the red wavelengths and high reflectance in the near infra-red (NIR) wavelengths of the electromagnetic spectrum. The images generating from various Vegetation Indices like Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI) etc. from multispectral imagery can provide valuable vegetation information about an area. Soil background conditions exert considerable influence on partial canopy spectra and calculated vegetation indices. Therefore, it is important to monitor the vegetation vigour changes with respect to the soil background conditions. For this purpose, a suitable remote sensing based algorithm i.e. Soil Adjusted Vegetation Index (SAVI) was selected and applied for the study. The analysis of vegetation vigour changes was done for different time series in the part of Andhra Pradesh state. The MODIS vegetation index images of 250m resolution were used. NDVI and NDWI images were derived for red and black soil types, with reference to that the SAVI model was created and executed in ERDAS IMAGINE platform. In SAVI equation, the soil adjusted factor ‘L’ was modified with different values and multivariate SAVI images were derived for both red and black soil regions. In the various red soil regions, the SAVI with ‘L’ value as 0.25, 0.3, 0.4 and 0.5 produced the fair result on soil and vegetation reflectance variations over the crop season. Similarly in the different black soil region, the vegetation cover is medium and SAVI with ‘L’ value as 0.3 and 0.4 produced the fair result on soil and vegetation variation. This study was done with only the two types of soil regions and with minimal datasets. The analysis part of the study can be extended with multiple data sets and different seasons.
{"title":"A study on vegetation vigour as affected by soil properties using remote sensing approach","authors":"N. Karthikeyan, M. C. Shashikkumar, J. Ramanamurthy","doi":"10.1109/RSTSCC.2010.5712811","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712811","url":null,"abstract":"Vegetation is a complex phenomenon with large amount of inherent spectral, spatial and temporal variability and it is typically characterized by strong absorption in the red wavelengths and high reflectance in the near infra-red (NIR) wavelengths of the electromagnetic spectrum. The images generating from various Vegetation Indices like Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI) etc. from multispectral imagery can provide valuable vegetation information about an area. Soil background conditions exert considerable influence on partial canopy spectra and calculated vegetation indices. Therefore, it is important to monitor the vegetation vigour changes with respect to the soil background conditions. For this purpose, a suitable remote sensing based algorithm i.e. Soil Adjusted Vegetation Index (SAVI) was selected and applied for the study. The analysis of vegetation vigour changes was done for different time series in the part of Andhra Pradesh state. The MODIS vegetation index images of 250m resolution were used. NDVI and NDWI images were derived for red and black soil types, with reference to that the SAVI model was created and executed in ERDAS IMAGINE platform. In SAVI equation, the soil adjusted factor ‘L’ was modified with different values and multivariate SAVI images were derived for both red and black soil regions. In the various red soil regions, the SAVI with ‘L’ value as 0.25, 0.3, 0.4 and 0.5 produced the fair result on soil and vegetation reflectance variations over the crop season. Similarly in the different black soil region, the vegetation cover is medium and SAVI with ‘L’ value as 0.3 and 0.4 produced the fair result on soil and vegetation variation. This study was done with only the two types of soil regions and with minimal datasets. The analysis part of the study can be extended with multiple data sets and different seasons.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132523886","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712797
J. Sudarsan, D. Maurya, Ruchi Singh, O. S. Muhammad Feroz
Air quality dispersion models have been used to predict the ground level concentrations (GLC) of air pollutants such as Particulate matter, SO2 and NOx etc. Industrial Source Complex Short Term Version 3 (ISCST3), a dispersion model developed by United States Environment Protection Agency (USEPA) is widely adopted in India to predict the GLC due to emissions from the industries. American Meteorological Society/Environment Protection Agency Regulatory Model Improvement Committee has developed an improved version model, Aermic dispersion Model (AERMOD) to predict the GLC. USEPA has adopted AERMOD as its regulatory model since 2005. This study examines the suitability of AERMOD for Indian conditions especially for a rural area near by Chennai. The validity of AERMOD model is examined considering a point source of emission from an industry which uses furnace oil as fuel. The study has been conducted to compare the predicted value using AERMOD and the actual value of GLC by field observations. The study also used ISCST3 to predict the GLC and the values obtained have been compared between the models. This study aimed at the comparison of the AERMOD and ISCST3 models for ambient air quality prediction. Further in this paper, local meteorological data have been used to a greater accuracy to validate the models AERMOD and ISCST3 for the point source of emission of SO2. It is clear from this study that weather data playing a vital role in validation of model and to predict the air pollution concentration in a particular station. And also it is clear that both AERMOD and ISCST3 have under predicted the concentrations than that of the observed value and the accuracy of the predicated data is mainly depending on the weather data.
{"title":"Role of weather data in validating air quality models","authors":"J. Sudarsan, D. Maurya, Ruchi Singh, O. S. Muhammad Feroz","doi":"10.1109/RSTSCC.2010.5712797","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712797","url":null,"abstract":"Air quality dispersion models have been used to predict the ground level concentrations (GLC) of air pollutants such as Particulate matter, SO2 and NOx etc. Industrial Source Complex Short Term Version 3 (ISCST3), a dispersion model developed by United States Environment Protection Agency (USEPA) is widely adopted in India to predict the GLC due to emissions from the industries. American Meteorological Society/Environment Protection Agency Regulatory Model Improvement Committee has developed an improved version model, Aermic dispersion Model (AERMOD) to predict the GLC. USEPA has adopted AERMOD as its regulatory model since 2005. This study examines the suitability of AERMOD for Indian conditions especially for a rural area near by Chennai. The validity of AERMOD model is examined considering a point source of emission from an industry which uses furnace oil as fuel. The study has been conducted to compare the predicted value using AERMOD and the actual value of GLC by field observations. The study also used ISCST3 to predict the GLC and the values obtained have been compared between the models. This study aimed at the comparison of the AERMOD and ISCST3 models for ambient air quality prediction. Further in this paper, local meteorological data have been used to a greater accuracy to validate the models AERMOD and ISCST3 for the point source of emission of SO2. It is clear from this study that weather data playing a vital role in validation of model and to predict the air pollution concentration in a particular station. And also it is clear that both AERMOD and ISCST3 have under predicted the concentrations than that of the observed value and the accuracy of the predicated data is mainly depending on the weather data.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123163493","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712863
T. Jaya, V. Kannan
This paper provides new insight into the cause of photovotage generation and channel conductance variation in an ion-implanted buried-gate GaAs MESFET with front side illumination. When optical fiber with modulated frequency falls on the device, flow of charge carriers changes corresponding to the change in the wavelength and frequency of incident light. The photo voltage is developed due to the transport of holes across the schottky junction .The data suggest that the magnitude of photo voltage increases, and as a result, there are more uncovered ionic charges in the space charge region toward the drain-side of the gate. This analysis including surface states and the ion implanted buried-gate process. The access charge density at the drain-side of the depletion induces opposite charges in the gate electrode. Consequently, it gives forward biasing to the Schottky barrier gate which increases with increasing values of Ids. As a result, the modulation of channel conductance and photo-voltage characteristics due to the buried-gate GaAs MESFET becomes high effective. The results indicate very good performance of the device compared to other devices like MESFET under back illumination and MESFET with front illumination having surface gate.
{"title":"Photovoltage and channel conductance analysis of buried gate MESFET with modulation frequency","authors":"T. Jaya, V. Kannan","doi":"10.1109/RSTSCC.2010.5712863","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712863","url":null,"abstract":"This paper provides new insight into the cause of photovotage generation and channel conductance variation in an ion-implanted buried-gate GaAs MESFET with front side illumination. When optical fiber with modulated frequency falls on the device, flow of charge carriers changes corresponding to the change in the wavelength and frequency of incident light. The photo voltage is developed due to the transport of holes across the schottky junction .The data suggest that the magnitude of photo voltage increases, and as a result, there are more uncovered ionic charges in the space charge region toward the drain-side of the gate. This analysis including surface states and the ion implanted buried-gate process. The access charge density at the drain-side of the depletion induces opposite charges in the gate electrode. Consequently, it gives forward biasing to the Schottky barrier gate which increases with increasing values of Ids. As a result, the modulation of channel conductance and photo-voltage characteristics due to the buried-gate GaAs MESFET becomes high effective. The results indicate very good performance of the device compared to other devices like MESFET under back illumination and MESFET with front illumination having surface gate.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123171051","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712807
R. Joselin, M. Enamuthu, K. Usha, E. Vasudev, T. Chelladurai
There is a need of design a reliable light weight composite pressure vessel for a launch vehicle or missile system. The composite pressure vessel acted upon by static internal pressure and dynamic during flight, but for practical structural integrity purposes, consideration of internal pressure is all that is necessary. This paper examines the performance of 6-litre capacity cylindrical Glass fiber reinforced plastic (GFRP) pressure vessel under cyclic loading cum burst tests using Acoustic Emission (AE) technique. AE data was acquired only up to 50% of the theoretical burst pressure. Based on the inferences a relation was developed to predict the burst performance of this class of bottles. In fact, one could infer that impending failure was significant even at 50 to 60% of maximum expected operating pressure (MEOP) with a reasonable error margin. Comparative studies were performed with identically machined GFRP pressure vessels which are also within the limit.
{"title":"A comparative study on failure pressure estimations of GFRP pressure vessels using Acoustic Emission technique","authors":"R. Joselin, M. Enamuthu, K. Usha, E. Vasudev, T. Chelladurai","doi":"10.1109/RSTSCC.2010.5712807","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712807","url":null,"abstract":"There is a need of design a reliable light weight composite pressure vessel for a launch vehicle or missile system. The composite pressure vessel acted upon by static internal pressure and dynamic during flight, but for practical structural integrity purposes, consideration of internal pressure is all that is necessary. This paper examines the performance of 6-litre capacity cylindrical Glass fiber reinforced plastic (GFRP) pressure vessel under cyclic loading cum burst tests using Acoustic Emission (AE) technique. AE data was acquired only up to 50% of the theoretical burst pressure. Based on the inferences a relation was developed to predict the burst performance of this class of bottles. In fact, one could infer that impending failure was significant even at 50 to 60% of maximum expected operating pressure (MEOP) with a reasonable error margin. Comparative studies were performed with identically machined GFRP pressure vessels which are also within the limit.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123203638","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712792
M. Karthikeyan, R. Manasa
This paper attempts to integrate RF technology into Nuclear Radiation detector circuitry. In the proposed system, a Nuclear Radiation sensor upon senses Radiation, activates its alarm, sends a low voltage signal to all the other Radiation detectors in the vicinity. This low voltage signal activates the individual relays in the other Radiation detectors causing to emit a tone that alerts residents, that one of the Radiation detectors senses Radiation. In this system the transmitter and the receiver are installed in a unit and the need for the base is eliminated. The individual Radiation detectors are equipped with all the electronics required to both send and receive signals. They are battery operated and therefore they require no external connections. They can be installed by a layman just on a watch tower. The proposed design is aiming to have cost efficient system, compact design, easily expandable, simple to install, replaceable components. The system was tested indoor with a normal test bench with the presence of artificial source.
{"title":"Nuclear radiation detection using low cost wireless system: Protection of environment against nuclear leakage and dump","authors":"M. Karthikeyan, R. Manasa","doi":"10.1109/RSTSCC.2010.5712792","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712792","url":null,"abstract":"This paper attempts to integrate RF technology into Nuclear Radiation detector circuitry. In the proposed system, a Nuclear Radiation sensor upon senses Radiation, activates its alarm, sends a low voltage signal to all the other Radiation detectors in the vicinity. This low voltage signal activates the individual relays in the other Radiation detectors causing to emit a tone that alerts residents, that one of the Radiation detectors senses Radiation. In this system the transmitter and the receiver are installed in a unit and the need for the base is eliminated. The individual Radiation detectors are equipped with all the electronics required to both send and receive signals. They are battery operated and therefore they require no external connections. They can be installed by a layman just on a watch tower. The proposed design is aiming to have cost efficient system, compact design, easily expandable, simple to install, replaceable components. The system was tested indoor with a normal test bench with the presence of artificial source.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120935748","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712885
R. Revathi, T. Kavitha
Traditional spatial-temporal adaptive signal processing techniques are often applied to conduct narrowband and wideband interferences. However, its mitigation performance degrades greatly due to mutual coupling. To solve this problem, this paper aims to utilize a spatial-temporal self-tuning synthesis filter capable of mutual coupling compensation and interference mitigation. The spatial filter and temporal filter are to compensate for the effect of mutual coupling and interference mitigation, respectively. Self-tuning mechanism is to adopt least square (LS) and minimum variable distortionless response-(MVDR-) based method to adjust spatial and temporal weights of antenna array. The experiment platform is established by the embedded development board. Simulation and experiment results demonstrate that the proposed method can effectively compensate for mutual coupling, mitigate the cochannel interference up to 30 dB, and enhance the acquisition performance of receivers in global navigation satellite system (GNSS).
{"title":"Predict temporal structure of the signal and the noise","authors":"R. Revathi, T. Kavitha","doi":"10.1109/RSTSCC.2010.5712885","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712885","url":null,"abstract":"Traditional spatial-temporal adaptive signal processing techniques are often applied to conduct narrowband and wideband interferences. However, its mitigation performance degrades greatly due to mutual coupling. To solve this problem, this paper aims to utilize a spatial-temporal self-tuning synthesis filter capable of mutual coupling compensation and interference mitigation. The spatial filter and temporal filter are to compensate for the effect of mutual coupling and interference mitigation, respectively. Self-tuning mechanism is to adopt least square (LS) and minimum variable distortionless response-(MVDR-) based method to adjust spatial and temporal weights of antenna array. The experiment platform is established by the embedded development board. Simulation and experiment results demonstrate that the proposed method can effectively compensate for mutual coupling, mitigate the cochannel interference up to 30 dB, and enhance the acquisition performance of receivers in global navigation satellite system (GNSS).","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121739298","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 : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712791
Zareena Begum Irfan
Environment and health are inextricably interlinked. The physical environment, such as drinking water, sanitation, housing, and air, has considerable effects on the health status and well being of people. Environmental change and its attendant health impacts are driven by many factors, including economic growth, population growth and movements. The three broad trends — the intensification of agriculture, industrialization, and rising energy use — which stand out in terms of their profound impacts on the physical environment and their enormous potential for influencing human health. Rapid urbanization and the uncontrolled growth of urban slums are now creating a double environmental health burden for the urban poor. In India, premature death and illness due to major environmental health risks accounts for nearly 20 percent of the total burden of disease in India. Proper environmental management is the key to avoiding the quarter of all preventable illnesses which are directly caused by environmental factors. There is an immediate need to tackle environmental health issues. Problems such as unsafe water, sanitation and hygiene, and air pollution are major contributors to the worldwide disease burden.
{"title":"Environmental pollution and public health: The socio-economic analysis of the global drivers of change","authors":"Zareena Begum Irfan","doi":"10.1109/RSTSCC.2010.5712791","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712791","url":null,"abstract":"Environment and health are inextricably interlinked. The physical environment, such as drinking water, sanitation, housing, and air, has considerable effects on the health status and well being of people. Environmental change and its attendant health impacts are driven by many factors, including economic growth, population growth and movements. The three broad trends — the intensification of agriculture, industrialization, and rising energy use — which stand out in terms of their profound impacts on the physical environment and their enormous potential for influencing human health. Rapid urbanization and the uncontrolled growth of urban slums are now creating a double environmental health burden for the urban poor. In India, premature death and illness due to major environmental health risks accounts for nearly 20 percent of the total burden of disease in India. Proper environmental management is the key to avoiding the quarter of all preventable illnesses which are directly caused by environmental factors. There is an immediate need to tackle environmental health issues. Problems such as unsafe water, sanitation and hygiene, and air pollution are major contributors to the worldwide disease burden.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114708743","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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