MONOPOLY UNIONS AND CORPORATISM : IMPLICATIONS FOR STRATEGIC TRADE POLICY

Bandyopadhyay, S.,Bandyopadhyay, S. C. 한국국제경제학회 1998 International Economic Journal Vol.12 No.4

Labor Unions and International Market Share Rivalry : Does Corporatism Matter?

Bandyopadhyay, Subhayu,Bandyopadhyay, Sudeshna Champati 세종대학교 국제경제연구소 1996 Journal of Economic Integration Vol.11 No.2

This paper studies the effects of corporatism on national welfare and optimal trade policy under monopoly unionism and efficient contracting. The results are remarkably different for the two models considered. Under free trade, corporatism is welfare augmenting in the monopoly union case while it has no effect on welfare in the efficient contract case. The optimal subsidy is increasing in the degree of corporatism under efficient contracting and independent of the degree of corporatism in the monopoly union case.(JEL: F13, J50)

Requirement of Protein Kinase C Pathway during progesterone-induced Oocyte Maturation in Amphibian, Rana dybowskii

Bandyopadhyay, Jaya,Bandyopadhyay, Arun,Kang, Hae-Mook,Kwon, Hyuk-Bang,Choi, Hueng-Sik The Korean Society for Integrative Biology 1998 Korean journal of biological sciences Vol.2 No.1

The present study investigated the involvement of the phospholipase C (PLC) and protein kinase C (PKC) signaling pathways during progesteroneinduced meiotic maturation in amphibian (Rana dybowskii) oocytes. Prosesterone-induced germinal vesicle breakdown (GVBD) of oocytes was significantly inhibited by a PKC inhibitor, staurosporine and a PLC inhibitor, U73122, in a dose-dependent manner. In contrast, U73343, an inactive analogue of U73122, was ineffective in suppressing GVBD. PKC activity in oocytes reached a maximum level at 30 min after progesterone stimulation and this elevated PKC activity was effectively suppressed by U73122 or staurosporine, suggesting that the activation of PKC enzyme is closely linked to PLC signaling during oocyte maturation. In addition, these inhib itors blocked the maturation promoting factor (MPF) activity which appeared in oocytes in response to progesterone, suggesting that PKC activation is an important signal for MPF activity. Therefore, this study demonstrates that the activation of PKC via PLC signaling is directly linked to an intracellular protein kinase cascade related to the appearance of MPF activity during meiotic maturation in amphibian (Rana dybowskii) oocytes.

Labor Unions and Inkrnationa1 Market Share Rivalry: Does Corporatism Matter?

( Subhayu Bandyopadhyay ),( Sudeshna Champati Bandyopadhyay ) 세종대학교 경제통합연구소 1996 Journal of Economic Integration Vol.11 No.2

This paper studies the effects of corporatism on national welfare and optimal trade policy under monopoly unionism and efficient contracting. The results are remarkably different for the two models considered. Under free trade, corporatism is welfare augmenting in the monopoly union case while it has no effect on welfare in the efficient contract case. The optimal subsidy is increasing in the degree of corporatism under efficient contracting and independent of the degree of corporatism in the monopoly union case. (JEL: F13, J50)

Nonparametric homogeneity test based on ridit reliability functional

Uttam Bandyopadhyay,Debajit Chatterjee 한국통계학회 2015 Journal of the Korean Statistical Society Vol.44 No.4

The paper provides nonparametric test procedures for comparing K (>2) unknown univariate populations, in which the tests are formulated by using consistent estimators of the ridit reliability functionals (see, for example, Bandyopadhyay and De, 2011) for comparing more than two populations. The tests are asymptotically distribution free and can be used for data on both discrete and continuous random variables. An extensive numerical study is performed to compare the proposed test with the nonparametric tests, obtained from Konietschke et al. (2012), in terms of type I error rate and power. A data study illustrates the use of such tests.

Regulation of Calcineurin, a Calcium/Calmodulin-dependent Protein Phosphatase, in C. elegans

Jaya Bandyopadhyay,Arun Bandyopadhyay,Jungsoo Lee 한국분자세포생물학회 2004 Molecules and cells Vol.18 No.1

Calcineurin is a calcium/calmodulin-dependent serine/ threonine protein phosphatase. It is a heterodimeric protein consisting of a catalytic subunit calcineurin A, and a regulatory calcium-binding subunit, calcineurin B. The primary sequence of both subunits and heterodimeric structure is highly conserved from yeast to mammals. Calcineurin has long been implicated in various signaling pathways. Calcineurin genes (cna- 1/tax-6 and cnb-1) have been identified in the nematode Caenorhabditis elegans, which share high homology with their Drosophila and mammalian counterparts. C. elegans calcineurin binds calcium and functions as a heterodimeric protein phosphatase establishing its biochemical conservation. Calcineurin expresses in diverse tissues implicating its important role in various physiological processes. This review will focus in brief on the expression pattern and regulation of calcineurin including its effect on growth and development, locomotion, egg-laying, and sensory responses.

Robust multi objective optimization of anisotropic yield function coefficients

Bandyopadhyay, Kaushik,Hariharan, Krishnaswamy,Lee, Myoung-Gyu,Zhang, Qi Elsevier 2018 Materials & Design Vol.156 No.-

<P><B>Abstract</B></P> <P>The coefficients of yield functions have been conventionally determined based on limited number of experiments such as yield stresses and/or R-values along different material orientations. In the present study, a multi objective genetic algorithm (MultiGA) based approach was implemented to obtain coefficients of anisotropic yield functions by simultaneous error minimization for yield stresses and R-values. Three frequently employed yield functions, Hill 1948, Barlat 1989 and Barlat Yld2000-2d, in the sheet metal forming simulations were considered. The performance of the determined coefficients for each yield function was judged by comparing the predicted yield stress and R-values with experimental values. Fundamental questions regarding the effect of experimental data on determining the coefficients were analyzed using the proposed approach. It is generally perceived that increase in experimental data enhances the accuracy of the determination of coefficients. Some counter intuitive results obtained on this regard are discussed. Finally, finite element (FE) simulations were performed to predict earing profile in deep drawn cups and springback profile for split-ring test, which were validated with experimental results. From the comparative study with conventional method and experiment, the yield function coefficients optimized by the MultiGA performed well for predicting the deformation behaviors of various anisotropic sheet metals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Multi-objective Genetic Algorithm was successfully applied for identification of anisotropic yield coefficients. </LI> <LI> Estimation of in-plane anisotropy was improved with genetic algorithm based identification for yield coefficients. </LI> <LI> Coefficients of Yld2000-2d was estimated without experimental biaxial material data with reasonable accuracy. </LI> <LI> Increase in number of input data points did not ensure improvement in material anisotropy prediction always. </LI> <LI> Prediction accuracy of finite element simulation was improved with Genetic Algorithm based anisotropic yield coefficients. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Implications of right-handed neutrinos in <tex> $ B-L$</tex> extended standard model with scalar dark matter

Bandyopadhyay, Priyotosh,Chun, Eung Jin,Mandal, Rusa American Physical Society 2018 Physical review. D Vol.97 No.1

<P>We investigate the Standard Model (SM) with a U(1)(B-L) gauge extension where a B-L charged scalar is a viable dark matter (DM) candidate. The dominant annihilation process, for the DM particle is through the B-L symmetry breaking scalar to right-handed neutrino pair. We exploit the effect of decay and inverse decay of the right-handed neutrino in thermal relic abundance of the DM. Depending on the values of the decay rate, the DM relic density can be significantly different from what is obtained in the standard calculation assuming the right-handed neutrino is in thermal equilibrium and there appear different regions of the parameter space satisfying the observed DM relic density. For a DM mass less than O(TeV), the direct detection experiments impose a competitive bound on the mass of the U(1)(B-L) gauge boson Z ' with the collider experiments. Utilizing the non-observation of the displaced vertices arising from the right-handed neutrino decays, bound on the mass of Z ' has been obtained at present and higher luminosities at the LHC with 14 TeV centre of mass energy where an integrated luminosity of 100 fb(-1) is sufficient to probe mZ 'similar to 5.5 TeV.</P>

Graphitic carbon nitride modified graphene/NiAl layered double hydroxide and 3D functionalized graphene for solid-state asymmetric supercapacitors

Bandyopadhyay, Parthasarathi,Li, Xuyang,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2018 Chemical engineering journal Vol.353 No.-

<P><B>Abstract</B></P> <P>A series of proton-functionalized graphitic carbon nitride (<I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>) modified reduced graphene oxide (rGO)/nickel-aluminium layered double hydroxide (LDH) composites (<I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH-1 and <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH-2) were prepared by a novel scalable strategy using different amounts of <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO as a conductive matrix. The morphological analyses reveal that the LDH sheets are gradually assembled on the <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO matrix. The <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO and LDH mutually minimize their self-aggregation in <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH composite. The porous skeleton of <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH-1 (highest loading of <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO matrix) produces a high surface area (240 m<SUP>2</SUP>/g) and mesopores (diameter; 2.2 nm). The <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH-1 electrode generates a specific capacitance value of 1190 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>, excellent rate performance (71% at 10 A g<SUP>−1</SUP>), and good cycling stability (90% after 3000 cycles), in a three-electrode setup. Hierarchical <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB> functionalized rGO composite (3D-<I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>@rGO) was used as a negative material. The 3D-<I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>@rGO produces an excellent capacitance of 345 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>, high rate capability (74% at 10 A g<SUP>−1</SUP>) and good cyclic stability (90% after 3000 cycles). The <I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>-rGO/LDH-1 and 3D-<I>f</I>gC<SUB>3</SUB>N<SUB>4</SUB>@rGO were assembled to fabricate a solid-state asymmetric supercapacitor device using KOH/PVA gel electrolyte. The device operates within the potential window of 1.6 V and produces the highest energy density and power density of 54.76 W h kg<SUP>−1</SUP> and 12031.92 W kg<SUP>−1</SUP>, respectively. The solid-state device shows an excellent cycle life of 91% after 7000 cycles, and it can power a red LED, suggesting very efficient for practical application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Graphitic carbon nitride modified graphene/Ni-Al LDH was used as positive material. </LI> <LI> 3D graphitic carbon nitride functionalized graphene was used as negative material. </LI> <LI> An asymmetric solid-state supercapacitor (ASC) was successfully fabricated. </LI> <LI> ASC exhibits excellent capacitance (154 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>) and rate capability. </LI> <LI> ASC shows high energy (54.76 W h kg<SUP>−1</SUP>) and power (12031.92 W kg<SUP>−1</SUP>) densities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Improved formability prediction by modeling evolution of anisotropy of steel sheets

Bandyopadhyay, Kaushik,Basak, Shamik,Prasad, K. Sajun,Lee, Myoung-Gyu,Panda, Sushanta Kr.,Lee, Joonho Elsevier 2019 International journal of solids and structures Vol.156 No.-

<P><B>Abstract</B></P> <P>Depending on the experimental observations, the Marciniak–Kuckzinki (MK) model was modified incorporating the evolution in the Yld2000-2d anisotropic yield function as a function of plastic work for two ferritic stainless steel sheets. The numerically estimated FLDs were validated with the strain limits evaluated by stretch forming experiments. Moreover, FE simulations were conducted to predict limiting dome heights (LDH) and limiting drawing ratios (LDR) by both models with and without considering the anisotropy evolutions. Additional formability performances such as surface strain distributions over the deformed cup surfaces and earing profile were also compared with experimental results. It was observed that the accuracy of predictions for formability could be significantly improved in the FE simulations when both initial and its subsequent evolution in yield function were included in the modeling. Further, microstructural analysis of parent sheets and stretch formed cups were performed to understand the effect of microstructure change on the anisotropy and formability. It was found that the preferred orientations along rolling and transverse directions changed differently with deformation. Orientation distribution function and Taylor factor maps were analyzed to confirm non-proportional evolution in stress directionality for both the materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Estimation of directional evolution in flow stress with increase in effective plastic strain. </LI> <LI> Description of yield function evolution based on directional flow stress in FE and MK FLD model. </LI> <LI> Texture analysis confirms interdependency of directional hardening with deformed microstructure. </LI> <LI> Experimental validation of MK based FLD prediction incorporating yield shape evolution. </LI> <LI> Successful prediction of LDH and strain distribution applying yield evolution in FE model. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>