SOME POINT ESTIMATES FOR THE SHAPE PARAMETERS OF EXPONENTIATED-WEIBULL FAMILY

Singh Umesh,Gupta Pramod K.,Upadhyay S.K. The Korean Statistical Society 2006 Journal of the Korean Statistical Society Vol.35 No.1

Maximum product of spacings estimator is proposed in this paper as a competent alternative of maximum likelihood estimator for the parameters of exponentiated-Weibull distribution, which does work even when the maximum likelihood estimator does not exist. In addition, a Bayes type estimator known as generalized maximum likelihood estimator is also obtained for both of the shape parameters of the aforesaid distribution. Though, the closed form solutions for these proposed estimators do not exist yet these can be obtained by simple appropriate numerical techniques. The relative performances of estimators are compared on the basis of their relative risk efficiencies obtained under symmetric and asymmetric losses. An example based on simulated data is considered for illustration.

Total Cholesterol and Triglyceride Levels in Patients with Breast Cancer

Umesh Kapil,Ajeet Singh Bhadoria,Neha Sareen,Preeti Singh,Sada N. Dwivedi 한국유방암학회 2013 Journal of breast cancer Vol.16 No.1

A qualitative study on sea surface temperature over the tropical Indian Ocean and performance of Indian summer monsoon

Singh, Umesh Kumar,Singh, Gyan Prakash Springer-Verlag 2012 Theoretical and applied climatology Vol.109 No.3

SOME POINT ESTIMATES FOR THE SHAPE PARAMETERS OF EXPONENTIATED-WEIBULL FAMILY

UMESH SINGH,PRAMOD K. GUPTA,S. K. UPADHYAY 한국통계학회 2006 Journal of the Korean Statistical Society Vol.35 No.1

Maximum product of spacings estimator is proposed in this paper asa competent alternative of maximum likelihood estimator for the parame-ters of exponentiated-Weibull distribution, which does work even when themaximum likelihood estimator does not exist. In addition, a Bayes type esti-mator known as generalized maximum likelihood estimator is also obtainedfor both of the shape parameters of the aforesaid distribution. Though, theclosed form solutions for these proposed estimators do not exist yet thesecan be obtained by simple appropriate numerical techniques. The relativeperformances of estimators are compared on the basis of their relative riskeciencies obtained under symmetric and asymmetric losses. An examplebased on simulated data is considered for illustration.AMS 2000 subject classications.Primary 62F10, 62F15, 93B40; Secondary 65C10,62N99.Keywords. Maximum product of spacings estimators, generalized maximum likelihoodestimators, maximum likelihood estimator, squared error loss function, LINEX loss func-tion, relative risk eciency, non-informative prior.1. IntroductionThe data obtained from lifetime experiments are referred to as failure timedata and such failure time data, results from dierent lifetime experiments con-ducted under sophisticated controlled and complex environments, exhibit dier-ent ypes of failure rates, which are generally categorized as, constant, monotoneReceived November 2004; accepted December 2005.yThis work was supported by Senior Research Fellowship (S.R.F), funded by Council ofScientic and Industrial Research (C.S.I.R.), India.

Effect of Ba and Ho co-doping on crystal structure, phase transformation, magnetic properties and dielectric properties of BiFeO3

Jogender Singh, Ashish Agarwal,Ashish Agarwal,Sujata Sanghi,Tanvi Bhasin,Manisha Yadav,Umesh Bhakar,Ompal Singh 한국물리학회 2019 Current Applied Physics Vol.19 No.3

Multiferroics having composition Bi0.80-xBa0.20HoxFeO3 (BBFO, BBHFO5, BBHFO10, BBHFO15 and BBHFO20 for x=0.0, 0.05, 0.10, 0.15 and 0.20 respectively) were synthesized by method of solid state reaction. The crystal structure has been studied using X-ray diffraction technique. The X-ray patterns show enormous transform in crystal structure at concentration x=0.20. The Rietveld refinement of XRD patterns indicates that at concentration x=0.0 sample have rhombohedral structure with R3c space group while for the concentration x=0.05, 0.10, 0.15 and 0.20, the mixed phase including rhombohedral R3c and triclinic P1 space groups were obtained with best fitting. This phase transformation in crystal structure is observed due to mismatching of ionic radii of doped ions and parent ions. Magnetic properties of all samples were carried out by using vibrating sample magnetometry. M-H hysteresis loops shows that with doping of Ba and Ho antiferromagnetic BiFeO3 (BFO) transforms into ferromagnetic. The dielectric and ferroelectric measurements were carried out which shows that dielectric constant, dielectric loss and ferroelectric properties are enhanced with co-doping of Ho in comparison of the pristine BFO due to structure deformation and decrease in oxygen vacancies with higher concentration of Ho. Significant improvement has been observed in dielectric constant and remnant magnetization values with increasing content of Ho and decrease in the dielectric loss.

Changes in Inorganic Chemical Species in Fog Water over Delhi

Umesh Chandra Dumka,Suresh Tiwari,Rahul Sheoran,Hulivahana Nagaraju Sowmya,Deewan Singh Bisht,Atul Kumar Srivastava,Shiv Dev Attri,Philip Karl Hopke 한국대기환경학회 2022 Asian Journal of Atmospheric Environment (AJAE) Vol.16 No.2

Heavy fogs occur during the winter period over the part of northern India and impact aviation, public transport, the economy, public life, etc. During winter, fog water (FW) and non-monsoonal rainwater (NMRW) samples were collected in Delhi, which is a highly polluted and populated megacity in northern India. The collected FW and NMRW samples were analyzed for their inorganic chemical constituents (F-, Cl-, SO4 2-, NO3 -, NH4 +, Na+, K+, Ca2+, and Mg2+). The volume-weighted mean (VWM) pH, conductivity, and total dissolved solids (TDS) of FW were 6.89, 206 μS cm-1, and 107 mg L-1, respectively, indicating the dominance of alkaline species. The total measured ionic constituents (TMIC) in FW and NMRW were 5,738 and 814 μeq L-1, respectively, indicating highly concentrated FW in Delhi. The TMIC in FW were factors of 16 and 7 times more concentrated than MRW and NMRW samples, respectively. The concentrations of inorganic acidic species (SO4 2- and NO3 -) in FW were much higher than in monsoon rainwater (MRW: 3 and 5 times) and NMRW (8 and 12 times), respectively. Also, the concentrations of SO4 2- and NO3 in NMRW were approximately double compared to MRW indicating higher acidic species concentrations during the winter season over Delhi region. Significant decadal growth in the mean concentrations of ionic species in FW (SO4 2- - ~9 times; NH4 + - double) were observed between 1985 and 2010. However, the nitrate decreased by ~28%. The higher SO4 2- is likely from heavy-duty vehicles that burn sulfur-containing fuel. The anions in FW, MRW, and NMRW contributed 20, 42, and 43%. However, the cation contributions were 80, 58, and 57%, respectively. The anion contributions were lower in FW than MRW and NMRW indicating the weak formation of acidic species in fog water. The observed alkalinity suggests that it is unlikely for acid precipitation to be present in this region.

Classical and Bayesian methods of estimation for power Lindley distribution with application to waiting time data

Sharma, Vikas Kumar,Singh, Sanjay Kumar,Singh, Umesh The Korean Statistical Society 2017 Communications for statistical applications and me Vol.24 No.3

The power Lindley distribution with some of its properties is considered in this article. Maximum likelihood, least squares, maximum product spacings, and Bayes estimators are proposed to estimate all the unknown parameters of the power Lindley distribution. Lindley's approximation and Markov chain Monte Carlo techniques are utilized for Bayesian calculations since posterior distribution cannot be reduced to standard distribution. The performances of the proposed estimators are compared based on simulated samples. The waiting times of research articles to be accepted in statistical journals are fitted to the power Lindley distribution with other competing distributions. Chi-square statistic, Kolmogorov-Smirnov statistic, Akaike information criterion and Bayesian information criterion are used to access goodness-of-fit. It was found that the power Lindley distribution gives a better fit for the data than other distributions.

Spectrum of Cytological Findings in Fine Needle Aspiration Cytology of Breast Lumps with Histopathology Correlation: Experience in a Tertiary Care Rural Hospital in India

Kochhar, Ajay Kumar,Jindal, Umesh,Singh, Karandeep Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

To determine the pattern of disease in patients presenting with breast lumps and to determine the sensitivity and specificity of fine needle aspiration cytology of benign and malignant diseases as a diagnostic tool by correlating with histopathology findings. This retrospective study was carried out in the Department of Pathology, Maharaja Agrasen Medical College, Agroha, from Jan 2008 to April 2012. Fine needle aspiration cytology was performed on 370 cases and out of these 52 cases were received in the Department for histopathological examination. Fibroadenoma was the most common disease encountered, in 88 (24%), with a peak incidence in second and third decade of life. Fibrocystic disease was second, being common in the third and fourth decades of life. Peak incidences of duct ectasia, granulomatous and tubercular mastitis were seen in the third decade. Gynaecomastia showed two peak incidences in second and sixth decades of life. Out of total 370 cases undergoing fine needle aspiration, benign cases were 316 (85.4%), malignant and suspicious were 54 (14.6%) and 10 (2.70%) respectively. Out of total 22 histological confirmed malignant lesions 19 were interpreted as malignant cytologically while two as suspicious and one as benign. All thirty histologically confirmed benign cases were diagnosed as benign cytologically. The sensitivity, specificity, positive and negative predictive values were 98%, 100%, 100% and 96.4% respectively. FNA cytology is highly accurate for diagnosis of breast masses. However, the clinician should correlate FNA cytological results with physical examination and imaging findings to prevent false negative and false positive events and to obtain optimal management of their patients.

Design, Synthesis and Biological Evaluation of Some Novel Benzimidazole Derivatives for Their Potential Anticonvulsant Activity

Priyal Jain,Prakash Kumar Sharma,Rajesh Singh Pawar,Umesh Kumar Patil,Pradeep Kumar Singour,Harish Rajak 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.7

Selective GABAA receptor ligands are widely used clinically to reduce the occurrence of convulsions. Hence there is an intense interest in developing new benzimidazole derivatives demonstrating high selectivity and high affinity for GABAA receptors. With the purpose of designing new chemical entities with an enhanced binding affinity for GABAA/BZd receptor complex, we carried out a QSAR study on benzotriazine derivatives. We studied 28 potent GABAA receptor ligands; derivatives of benzotriazines, using a combination of various tested physicochemical, steric, electronic and thermodynamic descriptors to determine the quantitative correlation between binding affinity and structural features. The developed and validated final model showed a good correlative and predictive ability expressed by a squared correlation co-efficient (r2) of 0.954. The equation indicated that the binding affinity is strongly dependent upon the thermodynamic properties (CDE, DDE and PC). Correlation between these properties and anticonvulsant activity was used to synthesize compounds possessing potent anticonvulsant activity. Most of the compounds showed an ability to inhibit the maximum electroshock (MES) and pentylenetetrazole (PTZ)-induced convulsions. Compound 1A, i.e. 2-(4-Chloro-phenyl)-5-nitro-1H-benzimidazole exhibited maximum activity in both the convulsion models.

Evaluation on Dowel Force of Flexural Reinforcement with Shear Reinforcement Provided under Four Point Bending Load

Sreenivasa Prasad Joshi,P. Poluraju,Umesh K. Singh 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6

The experimental investigation was carried out to study the influence of dowel force of longitudinal flexural reinforcement of concrete beams. Due to intricacy involved in shear transfer mechanism accurate predictions of shear behavior was difficult to evaluate. The influence of shear in uncracked compression zone, aggregate interlocking, stirrups is well understood but contribution of dowel force was not clearly represented despite implied belief that dowel force is an important constituent in shear resistance. The idea of present study is to appraise shear resistance arising from dowel force with varying flexural reinforcement with shear reinforcement provided. A total of eight beams were cast and verified as parametric study. Four beams were provided with preformed diagonal tension cracks and another four beams were conventional beams. The study was carried out by keeping shear span to depth ratio and clear cover constant. Results obtained was studied from moment vs. displacement curve and strain vs. moment curve and compared with existing empirical formulas. It was noticed that aggregate interlocking is insignificant with shear reinforcement provided and beams with preformed diagonal tension cracks had exhibited greater structural behavior when compared to conventional beams.