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Search Results: 1 - 10 of 20834 matches for " Jagdesh Kumar "
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Islanding Protection and Islanding Detection in Low Voltage CIGRE Distribution Network with Distributed Generations  [PDF]
Ghullam Mustafa Bhutto, Ehsan Ali, Jagdesh Kumar, Muhammad Akram Bhayo
Smart Grid and Renewable Energy (SGRE) , 2014, DOI: 10.4236/sgre.2014.56014
Abstract:

The Power Quality (PQ), security, reliability etc., are the prime objectives of the power system. The protection is developed in such a way that it should be selective, fast, reliable and the cost effective. The study about the islanding protection in Low Voltage (LV) CIGRE distribution and networks like this has been proposed in this paper. This is achieved by developing the protection against the short circuit faults which might appear at the Medium Voltage (MV) bus. The protection of the network with significant penetration of the Distributed Generations (DGs) is a complicated process. The DG units which are directly connected to the grid such as synchronous or induction generators contribute large short power, whereas the DG units which are connected to the grid via inverters carry small amount of the short circuit power. This creates the problems in the protection of the network. If the proper protection coordination measures have not been taken, it might cause the mal-function of the protection devices which put the portion of the power network into the security threats. The selection of the islanding protection devices in this paper is made to protect the network against bi-directional currents at the time of short circuit fault. The LV CIGRE distribution network will enter into islanding if a fault is cleared at the MV bus by the proposed islanding protection devices. It is therefore, essential to detect the islanding in the CIGRE power network. The detection of the island in this network is another major objective of this paper. The detection of the island is proposed by using the technique which is based on the voltage phase angle difference. The simulations are carried out by using DIgSILENT power factory software version 15.0.

Vitamin D3: Association of Low Vitamin D3 Levels with Semen Abnormalities in Infertile Males  [PDF]
Anwar Ali Jamali, Bhojo Mal Tanwani, Ghulam Mustafa Jamali, Ameer Ali Jamali, Muhammad Ali Suhail, Jagdesh Kumar, Rajesh Kumar
Advances in Sexual Medicine (ASM) , 2018, DOI: 10.4236/asm.2018.84004
Abstract: Background: Insufficiency of vitamin D is one of the utmost general health issues all over the globe, including Pakistan; incompatible data are present on the possible relationship among serum vitamin D values and quality of semen. Objective: Lack of Vitamin D in body is related with a higher risk of various health problems including infertility. In our setup no such type of study had been conducted in the past on the relationship among serum vitamin D levels and infertility. This study was aimed to investigate male subjects with infertility and serum levels of vitamin D. Methods: This study was cross-sectional and performed on 243 male subjects who attended the clinic for evaluation of infertility from January 2016 to December 2017. Mean age of patients was 31.94 years with standard deviation of 7.52 years. The mean age of controls was 32.2 years with SD 8.42 years, age ranged between 20 years as minimum to 46 years as maximum. The minimum vitamin D level was 7.00 ng/dl while maximum
Effect of Foliar Applied Urea on Growth and Yield of Sunflower (Helianthus annuus L.)  [PDF]
Rajesh Kumar Oad, Muhammad Ali Ansari, Jagdesh Kumar, Dilpat Rai Menghwar
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104668
Abstract:
A field study was carried out during 2012-13 at Sindh Agriculture University, Tandojam, Pakistan, geographically latitude 25°N and longitude 68°E, to assess the effect of foliar applied urea on the growth and yield of sunflower. The experiment was laid out in a three-replicated Randomized Complete Block Design. Five treatments were tested against sunflower variety Hysun-33 which included: T1 = Control (no urea), T2 = Recommended urea soil applied (130 kg·ha﹣1) at sowing stage, T3 = 1% urea at 35 days after sowing, T4 = 1% urea at 60 days after sowing and T5 = 1% urea at 85 days after sowing. The results revealed that growth and yield characters as well as oil yield of sunflower were significantly (P < 0.05) affected by foliar application of urea. The most effective treatment comprised of foliar application of urea (1%) after 35 days of sowing in addition to recommended soil applied urea (130 kg·ha1) showed optimistic results with 89.61% seed germination, 179.65 cm plant height, 5.39 cm stem girth, 22.43 cm head diameter, 2063.25 grains head1, 68.51 g seed index/1000 seed weight, 2211.90 kg seed yield ha1 and 1046.75 kg oil yield ha1. The sunflower crop receiving foliar application of urea after 60 days or 85 days of sowing in addition to recommended soil applied urea ranked 2nd and 3rd; and sunflower plantation given no foliar urea and grown only on recommended soil applied urea (130 kg·ha1) ranked 4th with 1907.96 kg·ha1 seed yield and 841.91 kg·ha1 oil yield. However, sunflower plantation neither given foliar application of urea nor supplied with soil applied urea (control) ranked least for all the growth and yield parameters and oil yield. Hence, it is suggested for the farmers that in addition to 130 kg·ha1 soil applied urea, foliar application of urea (1%) after 35 days of sowing may be ensured for maximization of seed and oil yields in sunflower. The results further showed that in most cases, the crop receiving foliar application of urea after 60 and 85 days of sowing showed similarity (P > 0.05); but differences were significant (P < 0.05) when compared with foliar application after 35 days of sowing and rest of the treatments.
The Use of Multi-Objective Genetic Algorithm Based Approach to Create Ensemble of ANN for Intrusion Detection  [PDF]
Gulshan Kumar, Krishan Kumar
International Journal of Intelligence Science (IJIS) , 2012, DOI: 10.4236/ijis.2012.224016
Abstract: Due to our increased dependence on Internet and growing number of intrusion incidents, building effective intrusion detection systems are essential for protecting Internet resources and yet it is a great challenge. In literature, many researchers utilized Artificial Neural Networks (ANN) in supervised learning based intrusion detection successfully. Here, ANN maps the network traffic into predefined classes i.e. normal or specific attack type based upon training from label dataset. However, for ANN-based IDS, detection rate (DR) and false positive rate (FPR) are still needed to be improved. In this study, we propose an ensemble approach, called MANNE, for ANN-based IDS that evolves ANNs by Multi Objective Genetic algorithm to solve the problem. It helps IDS to achieve high DR, less FPR and in turn high intrusion detection capability. The procedure of MANNE is as follows: firstly, a Pareto front consisting of a set of non-dominated ANN solutions is created using MOGA, which formulates the base classifiers. Subsequently, based upon this pool of non-dominated ANN solutions as base classifiers, another Pareto front consisting of a set of non-dominated ensembles is created which exhibits classification tradeoffs. Finally, prediction aggregation is done to get final ensemble prediction from predictions of base classifiers. Experimental results on the KDD CUP 1999 dataset show that our proposed ensemble approach, MANNE, outperforms ANN trained by Back Propagation and its ensembles using bagging & boosting methods in terms of defined performance metrics. We also compared our approach with other well-known methods such as decision tree and its ensembles using bagging & boosting methods.
On the Design of Circular Fractal Antenna with U-Shape Slot in CPW-Feed  [PDF]
Raj Kumar
Wireless Engineering and Technology (WET) , 2010, DOI: 10.4236/wet.2010.12012
Abstract: A new ultawideband circular fractal antenna with notched-band characteristics is presented. A notched-band characteristic is achieved by employing a U-shape slot in 50 Ω feed lines. The ultra-wideband impedance matching and compact size have been obtained by using CPW-feed technique and the fractal concept. The measured result of proposed fractal antenna exhibits the ultra wideband characteristics from 3.0 to 18.0 GHz at VSWR 2:1 except notched-band frequency. The proposed antenna has been analyzed theoretically and experimentally with respect to design parameters. The measured radiation pattern of fractal antenna is nearly omnidirectional in azimuth plane throughout the operating frequency. This antenna is useful for UBW communication system.
Object-Oriented Finite Element Analysis of Metal Working Processes  [PDF]
Surendra Kumar
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36066
Abstract: Recently an object-oriented approach has been applied in the fields of finite element analysis with a view to treating the various complexities within these. It has been demonstrated that finite element software designed using an object-oriented approach can be significantly more robust than traditional codes. This paper describes a special kind of implementation of object-oriented programming which is rather hybrid in nature, in the development of a finite element code for engineering analysis of metal working problems using C++, and discusses the advantages of this approach.
Reactive Power and FACTS Cost Models’ Impact on Nodal Pricing in Hybrid Electricity Markets  [PDF]
Ashwani Kumar
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.23026
Abstract: In a competitive environment reactive power management is an essential service provided by independent system operator taking into account the voltage security and transmission losses. The system operator adopts a transparent and non-dis-criminatory procedure to procure the reactive power supply for optimal deployment in the system. Since generators’ are the main source of reactive power generation and the cost of the reactive power should be considered for their noticeable impact on both real and reactive power marginal prices. In this paper, a method based on marginal cost theory is presented for locational marginal prices calculation for real and reactive power considering different reactive power cost models of generators’ reactive support. With the presence of FACTS controllers in the system for more flexible operation, their impact on nodal prices can not be ignored for wheeling cost determination and has also to be considered taking their cost function into account. The results have been obtained for hybrid electricity market model and results have also been computed for pool model for comparison. Mixed Integer Non-linear programming (MINLP) approach has been formulated for solving the complex problem with MATLAB and GAMS interfacing. The proposed approach has been tested on IEEE 24-bus Reliability Test System (RTS).
Mental health services in rural India: challenges and prospects  [PDF]
Anant Kumar
Health (Health) , 2011, DOI: 10.4236/health.2011.312126
Abstract: Mental health services in India are neglected area which needs immediate attention from the government, policymakers, and civil society organizations. Despite, National Mental Health Programme since 1982 and National Rural Health Mission, there has been a very little effort so far to provide mental health services in rural areas. With increase in population, changing life-style, unemployment, lack of social support and increasing insecurity, it is predicted that there would be a substantial increase in the number of people suffering from mental illness in rural areas. Considering the mental health needs of the rural community and the treatment gap, the paper is an attempt to remind and advocate for rural mental health services and suggest a model to reduce the treatment gap.
Gold Nanorod, an Optical Probe to Track HIV Infection  [PDF]
Santosh Kumar
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.21006
Abstract: Infectious diseases caused by the human immunodeficiency virus (HIV) remain the leading killers of human beings worldwide, and function to destabilize societies in Africa, Asia and the Middle East. Driven by the need to detect the presence of HIV viral sequence, here we demonstrate that the second order nonlinear optical (NLO) properties of gold nanorods can be used for screening HIV-1 viral DNA sequence without any modification, with good sensitivity (100 pico-molar) and selectivity (single base pair mismatch). The hyper Rayleigh Scattering (HRS) intensity increases 58 times when label-free 145-mer, ss-gag gene DNA, was hybridized with 100 pM target DNA. The mechanism of HRS intensity change has been discussed with experimental evidence for higher multipolar contribution to the NLO response of gold nanorods.
Challenges on Induction of Broadly Neutralizing Antibodies for Optimization of HIV Vaccines Development and Vectored Immunoprophylaxis  [PDF]
Pankaj Kumar
Journal of Immune Based Therapies, Vaccines and Antimicrobials (JIBTVA) , 2013, DOI: 10.4236/jibtva.2013.21002
Abstract:

Despite extensive research efforts, a preventive human immunodeficiency virus (HIV) vaccine remains one of the major challenges in the field of AIDS research. Experimental strategies which have been proven successful for other viral vaccines are not enough to tackle HIV-1 and new approaches to design effective preventive AIDS vaccines are of utmost importance. Due to enormous diversity among global circulating HIV strains, an effective HIV vaccine must elicit broadly protective antibodies based responses; therefore discovering new broadly neutralizing antibodies (bNAbs) against HIV has become major focus in HIV vaccine research. However further understanding of the viral targets of such antibodies and mechanisms of action of bNAbs is required for advancement of HIV vaccine research. This technical note discusses our current knowledge on the bNAbs and immunoprophylaxis using viral vectors with their relevance in designing of new candidates to HIV-1 vaccines.

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