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- 저자 : Nishant Kumar (검색결과 20 건)
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Electrical Properties of Complex Perovskite Samarium Nickel Titanate
Nishant Kumar,Alo Dutta,S. Prasad,T. P. Sinha 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
The complex perovskite oxide samarium nickel titanate, Sm(Ni1/2Ti1/2)O3 (SNT) is synthesized by solid-state reaction technique. The x-ray diffraction pattern of the sample at room temperature shows monoclinic phase. The microstructure analysis of the sample is performed using scanning electron microscope. Alternating current impedance spectroscopy is used to investigate the electrical properties of SNT in a temperature range from 313 K to 673 K and in a frequency range from 100 Hz to 1 MHz. A peak is observed in the frequency dependence of imaginary part of electric modulus (M''(ω)) indicating a non-Debye type of relaxation. The relaxation peak of M''(ω) moves towards higher frequencies with the increase of temperature showing the thermally activated nature of the relaxation time. The relaxation times for M''(ω) at different temperatures are found to obey Arrhenius law with an activation energy of 0.57 eV. The scaling behaviour of M''(ω)shows that the relaxation describes the same mechanism at various temperatures. The complex impedance plane plots show that the relaxation mechanism in SNT is purely a bulk effect arising from the semiconductive grains of the sample. The frequency dependent conductivity is found to obey the power law.
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Kumar Nishant,Garg Pratibha,Singh Shailender 한국마케팅과학회 2022 Journal of Global Fashion Marketing Vol.13 No.2
The textile industry has emerged as a major pollution source owing to a rise in carbon footprint, the spike in greenhouse gas emission, and increasing landfill waste. Sustainable fashion has become a new style statement and industries are shifting their orientation towards environment-friendly manufacturing. The theory of planned behavior (TPB) model was employed with environmental concern, personal moral norms, and perceived consumer effectiveness to better predict the eco-friendly apparel purchase intention of educated Indian youths. Variance-based partial least squarestructural equation modeling (PLS-SEM) was applied to evaluate the hypothesized model. Findings indicated that perceived behavioral control has a strong significant positive influence on purchase intention followed by personal moral norms, attitude, and perceived consumer effectiveness. Environmental concern was found to have an indirect effect on purchase intention through three primary TPB variables and personal moral norms. Multigroup analysis (MGA) was performed to examine the moderating effect of perceived consumer effectiveness on an attitude–intention relationship. The highly perceived consumer effectiveness group was shown to have a more consistent attitude-purchase intention relationship as compared to the low-perceived consumer effectiveness group. The study promulgates insights to professionals and policymakers to formulate sustainable marketing strategies and policies to cope with the indigenous market conditions.
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Kumar, Nishant,Ganguly, Indrajit,Singh, Rajendra,Deb, Sitangsu M.,Kumar, Subodh,Sharma, Arjava,Mitra, Abhijit Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.7
The PCR- restriction fragment length polymorphism (RFLP) in and around TM4 of SLC11A1 gene and its association with the incidences of brucellosis in Hariana breed (Bos indicus) and Holstein Friesian crossbred (Bos indicus${\times}$Bos taurus) cattle was examined. A fragment of 954 bp encoding the TM4 was amplified, and RFLP was identified by digestion of the amplicon independently with AluI and TaqI. The amplicon (GenBank Acc. No. AY338470 and AY338471) comprised of a part of exon V (<59 bp) and VII (62>), and entire intron 5 (423 bp), exon VI (71 bp) and intron 6 (339 bp). Digestion with AluI revealed the presence of two alleles viz, A (281, 255, 79 and 51 bp) and B (541, 255, 79 and 51 bp). The frequency of A allele was estimated as 0.80 and 0.73 in Hariana and crossbred cattle, respectively. Due to presence of a polymorphic TaqI site at intron 5, two alleles: T (552 and 402 bp) and Q (231, 321 and 402 bp) were identified. The frequency of T allele was estimated as 0.96 and 0.97, respectively. For association study, on the basis of serological tests and history of abortion, the animals were grouped into "affected" and "non-affected". However, no association could be established with the observed RFLPs.
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Nishant Kumar,Fredrik Nordin 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
The aim of this study is to examine how knowledge-intensive services firms sustain relationships with their clients in competitive international business environment and propose a framework of customer-relationship management strategy aligned with the entrepreneurial orientation of the firms under consideration. Developing, enhancing and sustaining relationships with customers has been one of the key areas of research in marketing, not least within knowledge-intensive service industries (Kalwani and Narayandas, 1995; Das and Rangan, 2004). Research has shown that retaining customers is a less expensive and less time-consuming process than attracting new customers (Rosenberg and Czepiel, 1984). Furthermore, building intimate relationships with customers is crucial for creating new knowledge, customer loyalty and increasing profitability (Mattila, 2001). Yet, the relationship between customers and service providers is a complex process. Significant efforts have been made by researchers to uncover the dynamics of the relationship, such as probing into such questions as explaining the types and levels of relationship, factors that determine the quality of a relationship, and the service quality and its effects on the relationships (Ruyter, Moorman, and Lemmink, 2001). Of crucial importance for understanding customer relationship is strategies firms deploy in building long-term relationships with customers in international markets (Salter, 2001; Narver et al., 2004; Kocak, and Abimbola, 2009). Furthermore, having customers involved in the production of the service as co-producers (Vargo and Lusch, 2006) creates a special relationship between customers and employees. However, what happens to the relationship when customer requirements changes due the changes in competition or technology. This question is important as little is known about how, in the face of disruptive technological changes and fierce market competition, firms can maintain strong relationships with their clients in international markets. The continuous changes in the technological and competitive landscape are making it harder for service firms to keep their customers satisfied and commend their commitment for long periods of time (Narver et al., 2004). Theoretical background: B2B customer relationship marketing literature (Jaworski and Kohili, 1993; Salter, 2001; Narver et al., 2004) dwells on the benefits of developing long-term partnerships, trust, commitment, and satisfaction, which are the parameters of relationship quality and long-term orientation in customer relationship (Macintosh, 2007; Skarmeas et al., 2008). Customer relationship is a key aspect of the competitive sustenance of knowledge-intensive service firms in international markets, yet, this has not received much attention in the literature. Customer relationships are unique, develop over time and may serve as a resource which will be difficult for competitors to imitate or purchase (Dyer and Singh, 1998). Such resources can be source of competitive advantage in international market (see Barney, 1991) particularly when the service firm is new to the market. To overcome the challenges of newness and foreignness firms need to build a level of cooperation, trust, and long-term relationship with the customers that reveal the quality of relationship (Lahiri and Kedia, 2011). In the context of business-to-business relationships, relationship quality has been suggested to be the binding factor between partnering firms, such that their relationship goes beyond mere exchange of goods, services, or capital. The resulting benefits would then include customer satisfaction, enhanced perception of fairness and justice, customer loyalty, relationship satisfaction, positive word-of-mouth publicity, repeat transactions, and business continuity (Wu et al., 2006; Kale and Singh, 2009). Unlike in the previous studies where the concern is mainly about sustaining ongoing relationships with the customers through understanding and meeting the current requirements, this study stress on anticipating and shaping customers’ future needs, and proactively investing in those relationships, accordingly.Building on these initial theoretical considerations, this paper suggests three important strategies that explain why knowledge-intensive firms in international markets can endure over time after their initial phase of internationalisation. These are: customer relationship quality management (Jaychandran et al., 2005; Payne and Frow, 2005; Kim et al., 2011); customer relationship proactiveness (Sharma, 1994; Slater and Narver, 1998; Johannessen et al., 1999); and customer-focused innovativeness (Lumpkin and Dess, 1996; Zahra et al., 2000). Research design/methodology – Following Yin (1994), a multiple case studies approach is used. We draw on case study material gleaned from four Indian knowledge-intensive service firms, two are old firms, being in existence for more than 20 years, and two new firms, which we consider as particularly revelatory cases (Eisenhardt & Graebner, 2007: 27), because the old firms have sustained long term relationships with their clients in international market and new ones are trying to develop such relationships (Nasscom, 2010). Data was collected through personal interviews and from company websites and it was analysed abductively.Findings: The findings suggest that it is the entrepreneurial orientation (Lumpkin and Dess, 1996- innovativeness, proactivness, and risk-taking) of knowledge-intensive B2B firms in combination with other capabilities, such as marketing capability, service delivery capability, that explains their continued relationship with clients in international markets. Entrepreneurial orientation focuses on knowing the customers’ present and latent needs so as to cater for them in a proactive, innovative and unique way. Their focus on knowing the customer intimately helps the firms to lock in their customers and to retain them over long periods of time, thereby insuring their sustenance and continued development. Findings reveal that customers also play an active role in developing the intimate relationships and the transfer of intimate knowledge. This is mainly because of the high cost associated with the replacement of the knowledge that the partners have developed of each other and the mutual trust and commitment the partners invest in. Customers understand the risk and cost associate with the replacement of provider and, thus, are careful in the selection of service providers. The relationship normally begins with small projects that do not have serious cost and risk implications. As the relationship solidifies, and as each party learns more about the other party’s systems and processes, trust between the partners increases. Trust between top managers as well as between people on an operative level are equally important, thereby making relationship-building the responsibility and concern of everybody in the company. The intimate knowledge of the customer provides ample opportunity to the service firms to develop the required capabilities for meeting current and future needs of the customers. To the extent that the relationship is a long-term commitment, the cases under consideration witness how, in order to retain clients, they have to proactively anticipate their clients’ needs, as these are always changing. Being proactive helps the firm to keep abreast of their clients’ business thrust. Furthermore, firm has to be innovation-driven, and on the lookout for new technological trends. Leveraging its unique knowledge of its customers, these firms are more able than competitors to identify what future solutions would be relevant to the businesses of the clients. Both sensing and scanning the environment, on the one hand, and watching the customer’s evolving requirements, on the other. In summary, earlier studies have indicated that intimate knowledge of customers and good relationship are critical to market success, but have failed to how such intimacy can be developed and sustained over a period of time. The findings of this study provide insights into the factors underlying customer intimacy, such as customer relationship quality, a proactive approach, and the pursuit of innovativeness. In this sense, the current study fills an important gap in the literature on knowledge-intensive services. The study also has practical relevance relating to firms and managers operating in an knowledge-intensive industry.
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Nishant Kumar,Karen Xie,Winnie Mar,Thomas M. Anderson,Benjamin Carney,Nikhil Mehta,Roberto Machado,Michael J. Blend,Yang Lu 대한핵의학회 2015 핵의학 분자영상 Vol.49 No.4
Purpose To investigate the diagnostic performance of perfusion single-photon emission computed tomography/computed tomography (Q-SPECT/CT) in patients suspected to have pulmonary embolism (PE) but with indeterminate computed tomographic pulmonary angiography (CTPA) or planar ventilation/perfusion (V/Q) scans. Methods This retrospective study included two groups of patients. Group I consisted of 49 patients with nondiagnostic CTPA. These 49 patients underwent subsequent V/Q scans. Further Q-SPECTs were obtained in patients with indeterminate planar images and fused with existing CTPA. Group II consisted of 182 non-CTPA patients with indeterminate V/Q scans. These 182 patients underwent further Q-SPECT and separate noncontrast low-dose CT chest. Fusion Q-SPECT/ CT scans were obtained through FDA-approved software and interpreted according to published criteria as positive, negative, or indeterminate for PE. Upon retrospective analyses, the final diagnosis was made using composite reference standards including all available clinical and imaging information for at least 6-month follow-up. Results In group I patients, 1 was positive, 24 were negative, and another 24 (49 %, 24/49) were indeterminate. In the subsequent 24 Q-SPECT/CTPAs, 4 were positive, 19 were negative, and 1 was indeterminate (4.2 %, 1/24). In group II patients, 9 (4.9 %, 9/182) were indeterminate, 33 were positive, and 140 were negative. The combined nondiagnostic rate for Q-SPECT/CT was only 4.9 % (10/ 206). There was six false-negative and one false-positive Q-SPECT/CT examinations. The sensitivity, specificity, and positive and negative predictive value of Q-SPECT/ CT were 85.7 % (36/42), 99.4 % (153/154), 97.3 % (36/ 37) and 96.2 % (153/159), respectively. Conclusions Q-SPECT/CT improves the diagnostic rate with promising accuracy in diagnosing PE that yields a satisfactory clinical verdict, especially when the CTPA and planar V/Q scan are indeterminate.
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Singh, Nishant Kumar,Sarkar, A.,Deo, Anandita,Gautam, Kirti,Rai, S.K. The Korean Society of Medical and Biological Engin 2016 의공학회지 Vol.37 No.1
Weibull distribution with two parameters, shape (k) and scale (s) parameters are used to model the fatigue failure analysis due to periodic vortex shedding of the synovial fluid in knee joints. In order to determine the later parameter, a suitable statistical model is required for velocity distribution of synovial fluid flow. Hence, wide applicability of Weibull distribution in life testing and reliability analysis can be applied to describe the probability distribution of synovial fluid flow velocity. In this work, comparisons of three most widely used methods for estimating Weibull parameters are carried out; i.e. the least square estimation method (LSEM), maximum likelihood estimator (MLE) and the method of moment (MOM), to study fatigue failure of bone joint due to periodic vortex shedding of synovial fluid. The performances of these methods are compared through the analysis of computer generated synovial fluidflow velocity distribution in the physiological range. Significant values for the (k) and (s) parameters are obtained by comparing these methods. The criterions such as root mean square error (RMSE), coefficient of determination ($R^2$), maximum error between the cumulative distribution functions (CDFs) or Kolmogorov-Smirnov (K-S) and the chi square tests are used for the comparison of the suitability of these methods. The results show that maximum likelihood method performs well for most of the cases studied and hence recommended.
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Electroencephalographic Abnormalities in Clozapine-Treated Patients: A Cross-Sectional Study
Nishant Goyal,Samir Kumar Praharaj,Pushpal Desarkar,Haque Nizamie 대한신경정신의학회 2011 PSYCHIATRY INVESTIGATION Vol.8 No.4
The objective of our study was to examine the electroencephalogram (EEG) abnormalities associated with clozapine treatment. It was a cross-sectional study on 87 psychiatric patients on clozapine treatment. 32 channel digital EEG was recorded and analysed visually for abnormalities. EEG abnormalities were observed in 63.2% of patients. Both slowing and epileptiform activities were noted in 41.4% of patients. The EEG abnormalities were not associated with dose or duration of clozapine exposure.
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