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Article
Publication date: 7 March 2016

Tarek Gallah, Badii Bouzidi and Ahmed Masmoudi

The purpose of this paper is to deal the adaptation of a direct torque control (DTC) strategy, originally dedicated to three level three leg inverter fed induction motor…

Abstract

Purpose

The purpose of this paper is to deal the adaptation of a direct torque control (DTC) strategy, originally dedicated to three level three leg inverter fed induction motor (IM) drives, following a leg failure that required the reconfiguration of the inverter from three to two legs.

Design/methodology/approach

In case of troubles with one leg of a three level inverter, it is interesting in some applications to keep operating using the two remaining legs. So, after the detection and isolation of the faulty leg, the drive connection should be rearranged with the connection of the motor phase, previously linked to the faulty leg, to the mid point of the DC-bus voltage, leading to a three level two leg inverter topology (also called bridge B8-inverter).

Findings

It has been found that the IM drive exhibits better performances under the proposed DTC strategy dedicated to the reconfigured inverter than those yielded by the DTC of the IM drive under healthy operation of the inverter. It has been noticed that the only drawback affecting the reconfigured inverter fed IM drive is the speed range limitation.

Research limitations/implications

This work should be extended by an experimental validation of the proposed DTC strategies.

Originality/value

The power factor of the reconfigured three level inverter fed IM drive is higher than the one yielded by the three level three leg inverter fed one. This represents a crucial cost benefit.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 35 no. 2
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 2 May 2007

Charles R. Taylor, Michael L. Capella and John C. Kozup

The impact of DTC advertising of prescription drugs on consumers has been the subject of considerable debate worldwide. Proponents of DTC advertising argue that it allows…

Abstract

The impact of DTC advertising of prescription drugs on consumers has been the subject of considerable debate worldwide. Proponents of DTC advertising argue that it allows patients to make more informed decisions, helps address under-treatment of some medical conditions, and improves the economic value of health care, among other benefits. In contrast, critics of DTC advertising contend that it leads to consumers paying higher prices, patients potentially being misled about risks and benefits of drugs, and patients pressuring doctors to prescribe drugs. The authors examine this debate in the context of two leading theories on the effects of advertising – the Advertising=Information and Advertising=Market power schools of thought and review empirical studies that have examined the impacts of DTC advertising on consumers. It is found that the research evidence generally favors the Advertising=Information school, which is supportive of the idea that DTC helps patients become more informed and communicate more effectively with their doctors.

Details

Cross-Cultural Buyer Behavior
Type: Book
ISBN: 978-1-84950-485-0

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Article
Publication date: 7 October 2014

Shoujun Yin, Fangmei Lu, Yong Yang and Runtian Jing

The purpose of this paper is to provide an imprinting perspective of the organizational culture evolution at a large state-owned heavy equipment manufacturer. It aims at…

Abstract

Purpose

The purpose of this paper is to provide an imprinting perspective of the organizational culture evolution at a large state-owned heavy equipment manufacturer. It aims at exploring sensitive periods and the tension between persistence and decay of imprints.

Design/methodology/approach

It employs the case study approach. Both qualitative (interviews) and quantitative (survey) data were collected, from the directors, middle managements, and grass-roots staffs of Dong Fang Turbine Co. Ltd. Based on the set of four scenarios, both within-scenario analysis and cross-scenario analysis were conducted following the “replication logic.”

Findings

New survival threats are more possible to develop sensitive periods with new imprints than transition periods, and the authors suggest organizational culture can be divided into two categories as the institutional sensitive and the local community sensitive.

Originality/value

This study is not only an exploitation of imprinting theories, but also provides a different understanding of organizational evolution, especially in terms of imprints dynamic. Meanwhile, the case shows how institutional environment and local community has shaped differently the organizational culture.

Details

Journal of Organizational Change Management, vol. 27 no. 6
Type: Research Article
ISSN: 0953-4814

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Article
Publication date: 8 May 2007

Constantina Kavadas, Lea Prevel Katsanis and Jordan LeBel

The importance of consumer involvement is well recognized in marketing theory, but has been absent from past inquiries in consumers' processing of DTC advertisements. The…

Abstract

Purpose

The importance of consumer involvement is well recognized in marketing theory, but has been absent from past inquiries in consumers' processing of DTC advertisements. The authors believe it is necessary to account for varying levels of involvement between consumers in order to better appreciate their responses to DTC advertisement claims. The present study aims to shed additional insight into the relationship between consumer involvement and the processing of risk information in DTC advertising.

Design/methodology/approach

The study was a between‐subject factorial design and consisted of 156 students from a North American university. It used an instructional manipulation designed to compare how low and highly involved consumers perceive DTC drug advertisements and more specifically the benefit and risk information contained in such advertisements.

Findings

Findings indicate that consumers' perception and processing of DTC advertisements resembles consumers' reaction to fear appeals. Furthermore, consistent with previous studies, consumers react negatively to DTC advertisements containing a high content of risk information. Findings indicate that greater differences in consumer processing of risk information is observed when the sample is categorized as high versus low involved, rather than sufferer versus non‐sufferer, and that this consumer characteristic is important enough to include when examining consumer reactions to DTC advertisements.

Originality/value

The relationship between amount of risk information and consumer responses has not been empirically examined while controlling for the potential role of involvement. This study is a first step in addressing this gap.

Details

Journal of Consumer Marketing, vol. 24 no. 3
Type: Research Article
ISSN: 0736-3761

Keywords

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Article
Publication date: 1 January 2012

Badii Bouzidi, Abderrazak Yangui and Ahmed Masmoudi

This paper is devoted to the investigation of the potentialities of induction motor DTC strategies in position control applications.

Abstract

Purpose

This paper is devoted to the investigation of the potentialities of induction motor DTC strategies in position control applications.

Design/methodology/approach

A comparison study is carried out between two DTC strategies dedicated to position control applications such as robotic: the Takahashi DTC strategy where the induction motor is fed by a two‐level inverter and a new DTC strategy where the induction motor is fed by a three‐level inverter. Special attention is paid to the synthesis of the vector selection table of the second strategy in an attempt to guarantee a high dynamic with reduced ripple of the torque. The comparison study is achieved considering four performance criteria: phase current total harmonic distortion; inverter switching loss factor; quality factor; and inverter commutation frequency.

Findings

It has been found that the introduced DTC strategy offers higher performance than the Takahashi one. Of particular interest are: the reduction of both torque ripple and commutation frequency; the eradication of the demagnetization problem which is a vital requirement in position control applications; and the improvement of the power factor thanks to which a reduction of the inverter rating is gained.

Research limitations/implications

This work should be extended considering the validation of the obtained simulation results through experiments.

Originality/value

The paper proposes a new DTC strategy dedicated to position control applications. It allows the elimination of the demagnetization problem from which suffers the Takahashi DTC strategy at low speeds especially at zero speed in position control applications. It also offers a high power factor which opens up crucial cost benefits as far as the inverter rating is concerned.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 31 no. 1
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 21 November 2011

Kabir C. Sen

The present paper aims to understand the underpinnings of the variations in brand level direct‐to‐consumer (DTC) advertising through a two‐part study. First, it seeks to…

Abstract

Purpose

The present paper aims to understand the underpinnings of the variations in brand level direct‐to‐consumer (DTC) advertising through a two‐part study. First, it seeks to examine the various influences on advertising intensity (operationalized by advertising to sales ratios) in the context of DTC advertising. Second, it aims to analyze how changes in share of voice impact changes in market share.

Design/methodology/approach

Data on brand level advertising as well as sales were collected from different government and industry sources. This is used to compute the ratio of DTC advertising to sales as well as changes in share of voice, market share and average drug prices. A log‐log model is used to find parameter estimates based on OLS regression.

Findings

Market share has a negative influence on the ratio of advertising to sales. Drugs which have a greater degree of innovation (as judged by the FDA) appear to spend more on DTC advertising relative to sales. The paper also finds that an increase in share of voice is not associated with increased average drug prices, but is related to a growth of market share because of a change in the share of total prescriptions dispensed.

Originality/value

The paper is one of the few to examine the factors influencing advertising to sales ratios in the context of DTC advertising. It is also one of the first to investigate the relationship of changes in the share of voice with changes in market share.

Details

International Journal of Pharmaceutical and Healthcare Marketing, vol. 5 no. 4
Type: Research Article
ISSN: 1750-6123

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Article
Publication date: 1 December 2005

Tanuja Singh and Donnavieve Smith

To determine whether direct‐to‐consumer prescription drug advertising influences consumers' behavioral intentions.

Abstract

Purpose

To determine whether direct‐to‐consumer prescription drug advertising influences consumers' behavioral intentions.

Design/methodology/approach

Gathered data from 288 respondents using a pencil and paper mail survey. Respondents were asked about their knowledge and behavior regarding prescription drugs.

Findings

Indicated that while consumers generally have favorable perceptions of prescription drug advertising, their behavioral intentions are nevertheless influenced by a heightened awareness of specific branded drugs. Consumers feel empowered by the information provided in direct‐to‐consumer advertising and they are concerned about governmental attempts to regulate prescription drug advertising.

Research limitations/implications

Data was collected from a relatively homogenous sample with respect to ethnicity. Future research efforts could include respondents from diverse ethnic backgrounds and could incorporate questions regarding respondents' actual behaviors with respect to branded prescription drug medications.

Practical implications

Useful information for researchers, public policy makers and prescription drug manufacturers. Results suggest that consumer motivation to request branded drugs may be impacted by factors related to the quality of advertisements, trust in their physician, and personal competence. Consumer interest in advertised drugs may also depend on the strength of the relationship that they have with their physician.

Originality/value

This research fills an identified gap in the literature. While researchers have examined consumers' general perceptions of direct‐to‐consumer prescription drug advertising, little research has been done on the link between consumer perceptions and behavioral intentions.

Details

Journal of Consumer Marketing, vol. 22 no. 7
Type: Research Article
ISSN: 0736-3761

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Article
Publication date: 2 November 2015

Jisu Huh and Wonsun Shin

This study aims to investigate pharmaceutical company-sponsored disease information websites that are created and operated by pharmaceutical companies. Without clear…

Abstract

Purpose

This study aims to investigate pharmaceutical company-sponsored disease information websites that are created and operated by pharmaceutical companies. Without clear indication of the site ownership, these websites look like non-advertising health information websites. Consumers’ responses to pharmaceutical company-sponsored disease information websites were examined in comparison to their responses to typical direct-to-consumer (DTC) drug brand websites.

Design/methodology/approach

A field experiment was conducted with a representative sample of US adults. Study subjects were randomly assigned to one of three live websites: pharmaceutical company-sponsored disease information website; DTC brand website with a high level of trust cues; and DTC brand website with a low level of trust cues. After viewing the assigned websites, participants completed an online questionnaire. The questionnaire included measurements for perceived website trust, attitude toward the website, intention to use information, perceived importance of prescription drug information, perceived health, prescription drug use, disposition to trust, prior experience with the website and demographic information.

Findings

The pharmaceutical company-sponsored disease information website generated higher website trust and more positive attitude and information use intention than the DTC drug brand websites. The results suggest that company-sponsored disease information websites may present some ethical issues related to website identity information transparency, which seems to inhibit consumers’ persuasion knowledge activation and proper coping responses. Because such websites look like non-advertising health information websites, consumers tend to evaluate them more positively and place higher trust in them than typical DTC drug brand websites with clear advertiser identification.

Originality/value

This is the first study examining pharmaceutical company-sponsored disease information websites, a relatively new form of covert DTC online advertising with potential ethical concerns due to the site identity transparency issues. This study’s findings suggest that consumers are likely to be more trusting and receptive of information presented in websites taking the form of a non-advertising health information website than in DTC brand websites.

Details

International Journal of Pharmaceutical and Healthcare Marketing, vol. 9 no. 4
Type: Research Article
ISSN: 1750-6123

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Article
Publication date: 1 December 2005

Jaeun Shin and Sangho Moon

The purpose of this study is to provide an overview of the economic and clinical impacts of direct‐to‐consumer (DTC) advertising on consumers and physicians.

Abstract

Purpose

The purpose of this study is to provide an overview of the economic and clinical impacts of direct‐to‐consumer (DTC) advertising on consumers and physicians.

Design/methodology/approach

Controversy around the benefits and concerns associated with DTC advertising are summarized. The sources are sorted based on their position toward DTC promotions: defending or opposing. Two recent works by Woloshin et al. and by Weisseman et al. are discussed in depth to provide the empirical evidence for the impacts of DTC promotions.

Findings

Notwithstanding many concerns against DTC advertising, evidence‐based papers report that both consumers and physicians are potentially benefited from it. Consumers rate the health‐related information contained in DTC advertising as important. Physicians do not feel that they are pressured to prescribe inappropriate medications driven by DTC advertising. Physicians perceive improved communication and education among DTCA‐influenced patients. However, consumers tend to overestimate drug effectiveness when the ads vaguely convey the benefit information and subsequently, seek unnecessary treatments. DTC advertising needs to be required to demonstrate the benefit information using actual data. This will help consumers avoid overuse of drugs.

Originality/value

This paper recognizes DTC advertising as a positive force for the public health and at the same time identifies its potential negative effects on the economic and clinical aspects of the health care markets. This can offer practical help policymakers develop the effective regulations on DTC advertisings to reinforce the beneficial outcome while attenuating the potential harms that might take place.

Details

Journal of Consumer Marketing, vol. 22 no. 7
Type: Research Article
ISSN: 0736-3761

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Article
Publication date: 25 November 2013

Michael Mackert, Marie Guadagno, Amanda Mabry and Lindsay Chilek

The aim of this paper is to call for an increased focus on the ethics of direct-to-consumer (DTC) prescription drug advertising. This is important, not only to improve DTC

Abstract

Purpose

The aim of this paper is to call for an increased focus on the ethics of direct-to-consumer (DTC) prescription drug advertising. This is important, not only to improve DTC prescription drug advertising, but also to inform DTC advertising of future medical advances.

Design/methodology/approach

This conceptual paper discusses two examples of medical advances – personal genetic testing services and surgically implanted medical devices – to explain how investigating the research of DTC prescription drug advertising can set the stage for more ethical advertising of future medical advances.

Findings

Specific issues related to health literacy, at-risk populations impacted by health disparities, and medicalization of issues common to aging relate to the DTC advertising of prescription drugs and other medical advances. Creative approaches to investigating these issues in the context of prescription drug advertising can enrich the debate about drug advertising, but also prepare researchers, policymakers, and consumers for future advertising of new medical developments.

Originality/value

The value of this paper is its call for increased focus on the ethics of DTC prescription drug advertising, to improve the current marketing environment but also lay the foundation for other healthcare marketing in the future.

Details

International Journal of Pharmaceutical and Healthcare Marketing, vol. 7 no. 4
Type: Research Article
ISSN: 1750-6123

Keywords

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