Negative Exponential Disparity Based Robust Estimates of Ordered Means in Normal Models

Bhattacharya, Bhaskar,Sarkar, Sahadeb,Jeong, Dong-Bin The Korean Statistical Society 2000 Communications for statistical applications and me Vol.7 No.2

Lindsay (1994) and Basu et al (1997) show that another density-based distance called the negative exponential disparity (NED) is an excellent competitor to the Hellinger distance (HD) in generating an asymptotically fully efficient and robust estimator. Bhattacharya and Basu (1996) consider estimation of the locations of several normal populations when an order relation between them is known to be true. They empirically show that the robust HD based weighted likelihood estimators compare favorably with the M-estimators based on Huber's $\psi$ function, the Gastworth estimator, and the trimmed mean estimator. In this paper we investigate the performance of the weighted likelihood estimator based on the NED as a robust alternative relative to that based on the HD. The NED based estimator is found to be quite competitive in the settings considered by Bhattacharya and Basu.

Response to A Korean Post-Marketing Study of Abacavir/Dolutegravir/Lamivudine in Patients with HIV-1

Bhattacharya Sudip,Bhattacharya Sandip 대한감염학회 2024 Infection and Chemotherapy Vol.56 No.1

Response to “Adult Immunization Policy in Korea”

Bhattacharya Sudip,Bhattacharya Sandip 대한감염학회 2024 Infection and Chemotherapy Vol.56 No.1

Mechanism of Lipid Induced Insulin Resistance: An Overview

Samir Bhattacharya,Rakesh Kundu,Suman Dasgupta,Sushmita Bhattacharya 대한내분비학회 2012 Endocrinology and metabolism Vol.27 No.1

Type 2 diabetes (T2D) is rapidly spreading throughout the world. It’s an insidious disease and still treated in an indirect manner without having specific drug target. In majority cases T2D is treated with drugs that address type 1 diabetes, majority of drugs aim to increase insulin release although the root cause for T2D is not the dearth of insulin release, it occurs in the later stage of disease development. T2D silently progressed in the patient; it begins with insulin resistance that takes place due to the loss of insulin sensitivity. Though insulin resistance is the centre of pathogenesis, our treatment of the disease has not yet addressed it. It is now a fact that insulin resistance is manifested by lipid and fatty acids (FAs) play a critical role in blunting insulin sensitivity. Our understanding is still poor in deciphering how lipid impose insulin insensitivity, majority of workers suggest it is because of insulin signaling defects which implements insulin function in inhibiting glucose to the cell from circulation. Number of long chain saturated FA has been shown to produce insulin signaling defects. However, we really need further investigation to find specific target(s) for FA induced damage. In addition to these information, a new dimension of T2D is getting attractive is fetuin-A/α2-Heremans-Schmid Glycoprotein,a secretary protein from liver. Its gene locus has been identified as T2D susceptible. Fetuin-A’s excess expression occurs by FA and it disrupts adipocyte function. It has been shown to be associated with T2D especially in obesity. In this review, we briefly discuss the present status on the mechanistic understanding of lipid induced insulin resistance that leads to T2D. More we understand the mechanism; opportunity to fight the battle with T2D will be increasing. Since, this field is now vast; we covered a few major events.

Does inefficiency influence earnings management through discretionary loan loss provisions? Evidence from Indian banks

Sarit Biswas,Mousumi Bhattacharya,Sharad Nath Bhattacharya,Sharad Nath Bhattacharya 한양대학교 경제연구소 2022 JOURNAL OF ECONOMIC RESEARCH Vol.27 No.2

The research looks into the impact of efficiency on discretionary loan loss provisioning in Indian banks and whether government ownership of commercial banks impacts efficiency. Using data envelopment analysis to quantify efficiency, we investigate the effect of efficiency on discretionary loan loss provision using a two-stage least squares regression model while accounting for uncertain government policies and their unpredictable economic consequences (economic policy uncertainty). Banks that are not majority owned by the government are more efficient than banks that are majority owned by the government. Through discretionary loan loss provision, bank efficiency positively impacts earnings management. Bank earnings management practices are limited by economic growth, rising credit-to-deposit ratios, and domestic economic policy uncertainties. However, capital adequacy ratio and global economic policy uncertainties are positively related to earnings management in banks. The study provides insights into the link between efficiency and earnings management in the face of local and global uncertainties.

CoO nanoparticles deposited on 3D macroporous ozonized RGO networks for high rate capability and ultralong cyclability of pseudocapacitors

Bhattacharya, Pallab,Joo, Taigyu,Kota, Manikantan,Park, Ho Seok Elsevier 2018 Ceramics international Vol.44 No.1

<P><B>Abstract</B></P> <P>The integration of pseudocapacitive metal oxides with reduced graphene oxide (RGO) is considered an innovative chemical strategy to resolve both bottlenecks of pseudocapacitor and electrical double-layer capacitor for high performance supercapacitors. Herein, we report a facile synthesis method of highly porous three-dimensional (3D) CoO/RGO nanocomposite via ozone treatment, ice templating, and thermal annealing. The ozonized RGO surface provides a favorable interaction with cobalt precursor for a stable and uniform deposition of well-defined CoO nanoparticles. The morphology, structure, and chemistry of the resulting CoO/RGO nanocomposites are comprehensively characterized by spectroscopic methods. The CoO/RGO nanocomposites show fast and reversible pseudocapacitance due to a large accessible area, rapid ion transport, and low charge transfer resistance arising from 3D internetworked macroporosity. Thus, the nanocomposites achieve high specific capacitance up to 239.4Fg<SUP>-1</SUP> (volumetric capacitance = 12.04Fcm<SUP>-3</SUP>), excellent rate capability of 79.1%, and ultralong cyclic stabilities (of 93.2% at 10Ag<SUP>-1</SUP> even up to 10,000 cycles) in 6M KOH electrolyte. This simple synthesis method offers a promising solution for the design of high performance hybrid energy storage materials consisting of high capacity metal oxides and conductive graphene networks.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Ageing and temperature-dependent behaviour of CdS nanoparticles

Bhattacharya, Bhaskar,Tomar, Sandeep Kumar,Saxena, Amit,Lee, Jun Young,Park, Jung-Ki WILEY-VCH Verlag 2009 Physica Status Solidi. B Vol.246 No.4

<P>Nanoparticles of inorganic semiconductors in the form of colloids have attracted researchers due to their interesting optical properties. We report the process of the controlled coalescence of the nanoparticles in a colloid with time and also with temperature. Cadmium sulfide (CdS) nanoparticles were prepared in ethylene glycol (EG). The size of the particles was estimated by X-ray diffraction and transmission electron microscopy and matched with the optical absorption data. The particles in the EG matrix were subjected to controlled annealing and the shift in the absorption edge towards its bulk value (∼2.4 eV) was monitored. The change in the band-gap value has been used to calculate the increasing particle radii using the effective-mass model. A similar effect is also reported with ageing of these particulates. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>

A Framework for Correction of Multi-Bit Soft Errors in L2 Caches Based on Redundancy

Bhattacharya, K.,Ranganathan, N.,Soontae Kim IEEE 2009 IEEE transactions on very large scale integration Vol.17 No.2

<P>With the continuous decrease in the minimum feature size and increase in the chip density due to technology scaling, on-chip L2 caches are becoming increasingly susceptible to multi-bit soft errors. The increase in multi-bit errors could lead to higher risk of data corruption and potentially result in the crashing of application programs. Traditionally, the L2 caches have been protected from soft errors using techniques such as: 1) error detection/correction codes; 2) physical interleaving of cache bit lines to convert multi-bit errors into single-bit errors; and 3) cache scrubbing. While the first two methods incur large area overheads for multi-bit errors, identifying the time interval for scrubbing could be tricky. In this paper, we investigate in detail the multi-bit soft error rates in large L2 caches and propose a framework of solutions for their correction based on the amount of redundancy present in the memory hierarchy. We investigate several new techniques for reducing multi-bit errors in large L2 caches, in which, the multi-bit errors are detected using simple error detection codes and corrected using the data redundancy in the memory hierarchy. We also propose several techniques to control/mine the redundancy in the memory hierarchy to further improve the reliability of the L2 cache. The proposed techniques were implemented in the Simplescalar framework and validated using the SPEC 2000 integer and floating point benchmarks for L2 cache vulnerability, global cache miss-rate, average cycle count and main memory write back rate, considering the area and power overheads. Experimental results indicate that the vulnerability of L2 caches can be decreased by 40% on the average for integer benchmarks and 32% on the average for floating point benchmarks, with an average multi-bit error coverage of about 96%, with significantly less area and power overheads and with virtually no performance penalty. The proposed techniques are applicable to both single and multi-core processor-based systems.</P>

Microbial Growth and Action: Implications for Passive Bioremediation of Acid Mine Drainage

Bhattacharya, J.,Islam, M.,Cheong, Y. W. Springer Science + Business Media 2006 Mine water and the environment Vol.25 No.4

OPTOELECTRONIC INTEGRATED CIRCUITS FOR PHOTORECEIVERS AND COMMUNICATION SYSTEMS

Bhattacharya, Pallab 대한전자공학회 1989 ICVC : International Conference on VLSI and CAD Vol.1 No.1

Optoelectronic Integrated Circuits (OEICs), circuits that monolithically integrate lasers or photodetectors with electron components on a single semiconductor chip, are a device technology with the potential to meet a broad range of future telecommunications and computer system needs. As for the case of integrated electronics, monolithic integration of optical and electrical devices offers significant advantages over hybrid circuits in compactness and reliability, as well as for potential reduction in cost and for possible performance improvements resulting from reduced parasitics. In this paper I describe our work on monolithically integrated photoreceivers which use HEMTs, SISFETs, APDs and Camel diodes as components. I will also describe a monolithically integrated MQW bipolar optoelectronic switch and integration on optical fiber surfaces made by MBE and ex-situ processing.