Improving energy efficiency in wireless sensor networks through scheduling and routing

This paper is about the wireless sensor network in environmental monitoring applications. A Wireless Sensor Network consists of many sensor nodes and a base station. The number and type of sensor nodes and the design protocols for any wireless sensor network is application specific. The sensor data in this application may be light intensity, temperature, pressure, humidity and their variations .Clustering and routing are the two areas which are given more attention in this paper.Comment: 7 Pages, 2 Figures and 1 Tabl

Preliminary Phytochemical and Pharmacognostic Studies of Holoptelea integrifolia Roxb.

Systematic and detailed pharmacognostical studies have been performed on an important medicinal plant, Holoptelea integrifolia Roxb. (Ulmaceae). This species is used traditionally for the treatment of edema, diabetes, leprosy, skin diseases, intestinal disorders and piles. The present investigation deals with the internal structures of the leaf and stem, which have been studied and photographed. Fluorescence characteristics of the leaf and stem powder and the extracts of the leaves in various solvents have been compared along with quantitative values, ash values and extractive values. Preliminary phytochemical screenings of the extracts leaf and stem have also been performed and results are recorded and discussed. In conclusion, the macroscopic and microscopic characters, fluorescence analysis, physico-chemical determination and preliminary phytochemical screening can be used as a diagnostic tool in the correct identification of the plants. The adulterants if any present in these plants can also easily identified by the above studies

カンボジアにおける農業生産と伝統的食料摂取システムからの食料栄養要求の最適化のための環境影響評価

筑波大学University of Tsukuba博士（生物資源工学）Doctor of Philosophy in Bioresource Engineering2021doctoral thesi

Performance Improvement in Muli-user MIMO Networks via Interference Alignment

Almost all wireless networks are interference limited. Interference management has been always a primary concern for large section of current wireless networks with exponentially growing devices, lack of centralized medium access, power management. Because of broadcast nature of the wireless channel, all signals from simultaneous transmissions from devices apart in the same space, are added to the desired signal at the receiver end. Therefore optimal spectrum efficiency in such systems mandates distributed, low complexity interference management strategies with very less overhead which should be far more superior than existing successive interference cancellation, highly complex multiuser detection techniques. In this thesis, a novel interference management scheme- “Interference alignment” scheme for multi user scenario is investigated and analysed supporting the arguments with numerical results for most scenarios. Firstly, the concept of interference channel, Degrees of Freedom were well established which are prerequisite in understanding the predicament of multi user wireless channels. Later on, interference alignment concept has been put forward stating its origin back from linear algebra. IA for K-user MIMO is studied. In a fully connected K-user network with perfect channel state information, IA minimizes the interference space dimension at intended receivers thus maximizing the achievable capacity of the entire channel and increasing the Multiplexing gain. Later on the idea of IA is extended to multi-hop networks. A practical cellular multi-hop wireless network is considered and distributed interference alignment technique is implemented which shows superior performance even in high interference case. All IA schemes assume that the channels are full rank richly scattered environments which in practise is not always possible. The idea of using relays to act as external scatters which increase the rank of effective channel observed is considered. So two novel distributed relaying schemes have been proposed modifying the existing IA scheme to fit the case for rank deficient channels and still achieve multiplexing gain on par with full rank channels. The proposed algorithms doesn’t require global channel state information at all nodes except at relay nodes, doesn’t need large symbol extensions, and still are able to enhance the sum capacity of the networ

Impact of Clause 49 of Listing Agreement of Securities and Exchange Board of India on Corporate Governance

Corporate governance is the current exhortation in India as well as the world over. As an offshoot of economic liberalization, global investment in the form of foreign direct investment and foreign institutional investment have gained momentum leading to vast economic growth in India. On the other hand, major corporate scams that have occurred worldwide in recent times, have revealed that the need for strict supervision and scrutiny over corporate management and governance is a sin quo non for the protection of stakeholders and the growth of the nation which has to compete with the multinational companies in the global arena. Further, in India, most of the listed companies, and substantially all billion-dollar companies, are family-run. A particular characteristic of the Indian corporate landscape, however, is a tendency for individuals (and their families) to establish large interlocking networks of subsidiaries and sister companies that include partially owned, publicly listed companies. Such pyramidal structures can lead to severely inequitable treatment of shareholders. The extent of this control is frequently opaque to outsiders and undisclosed by insiders. A particular need for effective corporate governance in India is, therefore, to encourage the dynamism and growth of family. The inclusion of Clause 49 by Securities Exchange Board of India (SEBI) in the listing agreement between companies endeavouring to have their securities listed in stock exchanges has impacted the modality of corporate management. This research paper examines the impact of clause 49 of listing agreement of SEBI on corporate governance