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Gaussian broadcast channel with lossy state reconstruction

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Digital Communications and Networks 2019年第3期5卷 176-182页

作者： viswanathan ramachandran Department of Electrical Engineering Indian Institute of Technology Bombay India

We consider a state reconstruction problem where the additive state process of a Gaussian Broadcast Channel (GBC) is to be reconstructed at both receivers, subject to some distortion constraints. The state process we consider is Gaussian, independently and identically distributed, and known fully a-priori at the encoder. Each receiver has to perform a lossy estimation, to within some prescribed distortion tolerance under a squared error distortion criterion. The set-up also involves communicating messages across to the receivers, in addition to the estimation. The optimal trade-off between the distortions incurred at the receivers and the rates at which messages can be communicated, is of interest. We provide a complete characterization of the optimal rate vs. distortion performance.

关键词： Broadcast channel State transmission Dirty paper coding MMSE estimation

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The partial side information problem with additional reconstructions

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Digital Communications and Networks 2020年第1期 123-128页

作者： viswanathan ramachandran Department of Electrical Engineering Indian Institute of Technology Bombay

We consider a quadratic Gaussian distributed lossy source coding setup with an additional constraint of identical reconstructions between the encoder and the decoder. The setup consists of two correlated Gaussian sources,wherein one of them has to be reconstructed to be within some distortion constraint and match with a corresponding reconstruction at the encoder, while the other source acts as coded side information. We study the tradeoff between the rates of two encoders for a given distortion constraint on the reconstruction. An explicit characterization of this trade-off is the main result of the paper. We also give close inner and outer bounds for the discrete memoryless version of the problem.

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A Novel Approach for Groundwater Budgeting Using GIS in a Part of Pondicherry Region, India

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Journal of Water Resource and Protection 2010年第6期2卷 585-591页

作者： Sivaraman Pethaperumal Sabarathinam Chidambaram Kandasamy Vijayaragavan Mohan viswanathan Prasanna Kannan Anandavel Ulaganathan Karmegam ramachandran Manivannan Paluchamy Anandhan Kesari Tirumalesh 不详

The over extraction of groundwater from the coastal aquifers, result in reduction of groundwater resource and lowering of water level. In general, the depletion of groundwater level enhances the landward migration of saltwater wedge. Pondicherry is one such region with recent alluvium as the major formation. Since the study area forms a part of the coastal aquifer system this behaves as a fragile ecosystem. The present study has been attempted to calculate the extraction of water and to estimate the amount of recharge into this alluvial aquifer by using groundwater level variations. The monthly water level fluctuation was observed during the study period (2000-2002) in eighteen locations. The maximum rise in groundwater level observed during 2000 was considered as the initial water level for the study and the subsequent decline in water level (draw down) was monitored monthly until the rising trend was noted. This indicates the fall in water level due to extraction. Later keeping the deepest draw down as the initial value increasing water level trend was studied until there was a notice of decline in groundwater level. This indicates as the rise in water level due to recharge. This method of observation carried out at a single location was adopted for all eighteen locations. The spatial representation of these data for eighteen locations were carried out by using GIS and the area occupied by different groundwater level contours were calculated and the amount of water withdrawn/re- charged was estimated. The maximum recharge was noted in the central and the northern part of the study area when compared to the other regions. Similarly, the maximum discharge was noted in the northern and the southern part of the study area during the study period.

关键词： Water Level Recharge Groundwater Budget GIS

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封闭电镀铜—碳化硅复合镀层

包装工程 1981年第3期 51-54+46页

作者： Mohammad Ghouse M、viswanathan E.G.ramachandran 夏振华扬州无线电仪器厂

一、前言铜由于具有优异的综合性能,而成为许多工程技术普遍应用的一种金属结构材料。例如,突出的电和热传导性,对腐蚀及氧化的强抵抗力,以及有良好的延展性和可预制成构件等。当然,也有其不足之处,特别在温度较高时,铜的机械强度的相... 详细信息

一、前言铜由于具有优异的综合性能,而成为许多工程技术普遍应用的一种金属结构材料。例如,突出的电和热传导性,对腐蚀及氧化的强抵抗力,以及有良好的延展性和可预制成构件等。当然,也有其不足之处,特别在温度较高时,铜的机械强度的相对降低。在电气工业应用中,导电性是最重要

关键词：碳化硅含量 SCD 微粒金属金属材料复合镀层共沉积

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封闭电镀铜—碳化硅复合镀层

表面技术 1981年第3期 51-54+46页

作者： Mohammad Ghouse ,M、viswanathan ,E.G.ramachandran ,夏振华扬州无线电仪器厂

一、前言铜由于具有优异的综合性能,而成为许多工程技术普遍应用的一种金属结构材料.例如,突出的电和热传导性,对腐蚀及氧化的强抵抗力,以及有良好的延展性和可预制成构件等.当然,也有其不足之处,特别在温度较高时,铜的机械强度的相对降... 详细信息

一、前言铜由于具有优异的综合性能,而成为许多工程技术普遍应用的一种金属结构材料.例如,突出的电和热传导性,对腐蚀及氧化的强抵抗力,以及有良好的延展性和可预制成构件等.当然,也有其不足之处,特别在温度较高时,铜的机械强度的相对降低.在电气工业应用中,导电性是最重要的,但也要求在温度较高时,能有一定的强度.常规的增加铜材强度的方法,是采取冷加工和合金热处理,结果在较高温度下仍会因软化而失去强度或降低导电性.

关键词：碳化硅含量 SCD 复合镀层共沉积