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Design, and Analysis of Capacitive Shunt RF MEMS Switch for Reconfigurable Antenna
C. Leela Mohan,K Ch Sri Kavya,Sarat K. Kotamraju 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.1
This paper presents design and the performance analysis of capacitive shunt RF MEMS Switch. Here, the proposed Rf MEMS Switch shows the low pull-in voltage i.e 11.97 V and performed at 38 GHz with high isolation. To improve the performance of antenna characteristics microstrip feeding technique and co-planar-waveguide transmission line feeding are used in this design process. The impedance matching of 50Ω in the antenna is depends on the width of the feed line can be observed through simulated smith chart by using the Ansoft HFSS simulator. The micro strip patch antenna exhibits a Return loss is − 12.4264 dB and exhibits resonance at 38 GHz and the band width frequency from 37 to 39 GHz.After analyzing the performance of the antenna then the antenna is integrated with RF MEMS capacitive shunt switch through co-planar wave guide transmission feedline technique. By integrating with switch there is a frequency shift OF 1 GHz toward right from 38 GHz in antenna. The resonance is occurred at 39 GHz with bandwidth frequency between 38 and 40 GHz. The antenna exhibits return loss is − 27.2666 dB at operating frequency 39 GHz with RF MEMS switch and total gain of the antenna at 38 GHz with angle of ϕ = 90° is 5.6671 dB. Thus the performance of the antenna is increased by integrating with RF MEMS switch. These type of reconfi gurable antennas are used in high frequency applications at frequency range of Ka-band and in wireless communication applications and satellite communication.
Performance Evaluation of Feature Selection Methods on Large Dimensional Databases
Y. Leela Sandhya Rani,V. Sucharita,Debnath Bhattacharyya,Hye-Jin Kim 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.9
Data mining retrieves knowledge information from larger amounts of data. Clustering is an assemble of similar objects in to one class and dissimilar objects in to another class. When designing clustering ensemble on large dimensional data space, both time and space requirements for processing may be overinflated. This tends to impose feature selection methods to remove redundant features and handle the noise data. There are filter, wrapper and hybrid methods in feature selection. This paper shows a tour on types of feature selection techniques and numbers of experiments are conducted to compare feature selection techniques using different datasets with R tool, which gives better technique for clustering ensemble design.
Greater Political Representation for Women : The Case of India
Kasturi, Leela EWHA WOMANS UNIVERSITY PRESS 1998 Asian Journal of Women's Studies(AJWS) Vol.4 No.4
Women's political participation has been marginal worldwide. In some countries, state-sponsored affirmative action to increase women's representation and participation in the public sphere has been attempted with varied results. This paper traces the history of the debate on such affirmative action for women in India from the early years of this century to the present day through colonial and post-colonial contexts. Women's groups have played a vital role in pressing for or refusing to agree to special measures. The contemporary Indian women's movement (that was resurrected with full force in the 1970s) supports the entry of women in reserved seats in decision-making bodies in order to give them a head start. Although there was little opportunity for this at the local level, legislation to ensure women's entry into one-third seats in state and national bodies has been obstructed. A long struggle lies ahead for Indian women.
Madana Leela Nallappan,Mohamed Mahmoud Nasef,Teo Ming Ting,Arshad Ahmad 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
Nanofibrous poly(vinylidene fluoride) (PVDF) sheets were produced by electrospinning and grafted with oxirane groups using radiation induced grafting of glycidyl methacrylate (GMA) followed by treatment with N-methyl-D-glucamine (NMDG). The NMDG density in the nanofibers was tuned by optimization of the immobilisation reaction variables using response surface methodology (RSM). The various properties of NMDG-containing nanofibers were evaluated using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The NMDG-containing nanofibers were tested for boron selective removal from solutions. A maximum glucamine density yield of 2.2 mmol/g was obtained at 15 wt%, 87 oC, 64.7 min and 150 % for NMDG concentration, temperature, time and degree of grafting (DG), respectively. The applied procedure incorporating RSM was found to be highly effective in the optimization of covalently immobilised glucamine on the oxirane modified PVDF based-nanofibrous structure and in imparting an excellent combination of physico-chemical and boron retention properties. A complete boron removal was achieved in 100 mg/l boron solution adsorbent with a dosage of 0.6 g at pH 7 in 2 h time. This was accompanied by a promising reusability suitable for boron removal from solutions.
Bio-inspired Evasive Movement of UAVs based on Dragonfly Algorithm in Military Environment
Gudi, Siva Leela Krishna Chand,Kim, Bo-sun,Silvirianti, Silvirianti,Shin, Soo Young,Chae, Seog The Korea Institute of Information and Commucation 2019 Journal of information and communication convergen Vol.17 No.1
Applications of unmanned aerial vehicles (UAVs) in the military environment have become popular because they require minimum human contribution and can avoid accidents during missions. UAVs are employed in various missions such as reconnaissance, observation, aggression, and protection. Consequently, counter-measures, known as anti-drone technologies, have been developed as well. In order to protect against threats from anti-drone technologies and enhance the survivability of UAVs, this study proposes an evasive measure. The proposed bio-inspired evasive maneuver of a UAV mimics a dragonfly's irregular flight. The unpredictable UAV movement is able to confuse enemies and avoid threats, thereby enhancing the UAV's survivability. The proposed system has been implemented on a commercial UAV platform (AR Drone 2.0) and tested in a real environment. The experiment results demonstrate that the proposed flight pattern has larger displacement values compared to a regular flight maneuver, thus making the UAV's position is difficult to predict.
Kalita, Dipti,Pant, Leela,Singh, Sompal,Jain, Gaurav,Kudesia, Madhur,Gupta, Kusum,Kaur, Charanjeet Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Gall bladder carcinoma is the most common cancer of biliary tree, characterized by rapid progression and a very high mortality rate. Detection at an early stage, however, is indicative of a very good prognosis and prolonged survival. The practice of histopathological examination of gall bladder specimens removed for clinically benign conditions and its usefulness has been a subject of controversy. The present prospective study was carried out over a period of four years in order to find out the incidence of unsuspected gallbladder carcinoma in cholecystectomy specimens received in our histopathology laboratory and to analyze their clinico-pathological features. A total of 4,115 cases were examined. Incidentally detected cases comprised 0.44%, which accounted for 72% of all gall bladder carcinomas detected. The majority were in an early, surgically resectable stage. From the results of this study we recommend that in India and other countries with relatively high incidences of gall bladder carcinoma, all cholecystectomy specimens should be submitted to histopathology laboratory, as this is the only means by which malignancies can be detected at an early, potentially curable stage.