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Article
Publication date: 11 May 2010

Veran V. Vasić, Darko P. Marčetić, Slobodan N. Vukosavić and Đura V. Oros

The purpose of this paper is to propose an analytical method for prediction of self‐sustained oscillations that might happen during low‐cost induction motor drive application…

332

Abstract

Purpose

The purpose of this paper is to propose an analytical method for prediction of self‐sustained oscillations that might happen during low‐cost induction motor drive application. This forecast is needed to avoid unwanted oscillations that can be encountered for in fan, compressor and pump drives utilizing open‐loop frequency‐controlled three‐phase induction motor drives.

Design/methodology/approach

The paper presents the model of the induction motor drive system that includes inverter switches dead‐time and allows discontinuous current of front‐end rectifier. Stability analysis of proposed model was performed by tracing the eigenvalues of the overall system matrix.

Findings

Discontinuous rectifier current at light loads and the dead‐time of the inverter switches are the main sources of undesired low‐frequency self‐sustained speed oscillations in open‐loop controlled induction motor drives. The evaluated risk prediction is a function of drive and motor parameters and load level.

Originality/value

The proposed induction motor drive system model highlights the direct connection between the self‐sustained speed oscillations and the system parameters like inverter dead time, dc capacitor values, motor parameters and motor load level. Good accuracy of instability prediction is verified by dynamic simulation and by extensive experimentation.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 29 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 17 April 2009

Hanjoo Yoo, Jong‐Woo Park and Gwangsuk Song

The purpose of this study is to analyze the efficiency of the service quality activity itself by using the DEA Model, in contrast to previous quality evaluation methods, as an…

1831

Abstract

The purpose of this study is to analyze the efficiency of the service quality activity itself by using the DEA Model, in contrast to previous quality evaluation methods, as an attempt to evaluate the service quality activities of the distribution industry. Furthermore, by complementing the shortfalls of the weighted value of the DEA Model, it recommends a DEA/PS Model that is appropriate in the evaluation of service quality activities. Based on this model, the study proposes the SQAE Model, an evaluation tool to complement the traditional measuring method. According to the results of the analysis of 18 sample distribution businesses, there was a discrepancy by business in the results of the Traditional Scoring System and the Evaluation Measuring System. Therefore, it is most desirable to not only be active in service quality activities but also increase efficiency at the same time.

Details

Asian Journal on Quality, vol. 10 no. 1
Type: Research Article
ISSN: 1598-2688

Keywords

Available. Open Access. Open Access
Article
Publication date: 31 August 2014

Seong-Gyu Jeon and Yong Jin Kim

The weapon system of The Navy is the small quantity producing system on multiple kinds. It is consisted of various equipment and the subordinate parts of those which can repair…

293

Abstract

The weapon system of The Navy is the small quantity producing system on multiple kinds. It is consisted of various equipment and the subordinate parts of those which can repair the damaged part. The operating procedure concerning warship's repair parts managed under these systems is as follows. Firstly, if demand of repair parts occurs from warship which is the operating unit of weapon, then the Fleet(the repair & supply support battalion) is in charge of dealing with these requests. If certain request from warship is beyond the battalion's capability, it is delivered directly to the Logistic Command. In short, the repair and supply support system of repair parts can be described as the multi-level support system. The various theoretical researches on inventory management of Navy's repair parts and simulation study that reflects reality in detail have been carried out simultaneously. However, the majority of existing research has been conducted on aircraft and tank's repairable items, in that, the studies is woefully deficient in the area concerning Navy's inventory management. For that reason, this paper firstly constructs the model of consumable items that is frequently damaged reflecting characteristics of navy's repair parts inventory management using ARENA simulation. After that, this paper is trying to propose methodology to analyze optimal inventory level of each supply unit through OptQuest, the optimization program of ARENA simulation.

Details

Journal of International Logistics and Trade, vol. 12 no. 2
Type: Research Article
ISSN: 1738-2122

Keywords

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Article
Publication date: 1 June 2006

Jaebeom Suh, Swinder Janda and Sunhee Seo

The purpose of this study is to explore how customers from different cultures develop trust with service providers to uncover underlying dimensions of trust development for…

3063

Abstract

Purpose

The purpose of this study is to explore how customers from different cultures develop trust with service providers to uncover underlying dimensions of trust development for customers from different cultures.

Design/methodology/approach

This study utilizes semi‐structured phenomenological depth interviews to explore the role of culture in the development of trust with service providers.

Findings

Customers' direct service experiences in their native culture and in the culture where they reside (in this study the USA), as well as recommendations from others appear to be the major determinants of trust. Furthermore, a customer's trust in a recommender seems to transfer over to a service provider.

Research limitations/implications

Because all informants were from one foreign culture (Korean), the findings related to primarily this group. Further generalization of these findings should only be made after studies conducted with informants from other foreign cultures.

Practical implications

Service organizations need to offer their employees training that emphasizes strategies oriented toward building and maintaining trust with customers from different cultural backgrounds in order to better read customers from different cultural backgrounds and to effectively react to their complaints.

Originality/value

The most unique part of trust development for Koreans who have lived in the USA would be the transference process. They seem to trust service providers or service organizations based on the recommendations related to specific service categories. Once trust is established in recommenders, it seems to naturally result in a transference process (e.g. trust transference from service provider to service organization).

Details

Journal of Services Marketing, vol. 20 no. 4
Type: Research Article
ISSN: 0887-6045

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