• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.626-631
• /
• 2004

In electric motor coaches, the rolling stocks move by the adhesive effort between rail and driving wheel. Generally, the adhesive effort is defined by the function of both the weight of electric motor coach and the adhesive effort between rails and driving wheel. The characteristics of adhesive effort is strongly affected by the conditions between rails and driving wheel. When the adhesive effort decreases suddenly, the electric motor coach has slip phenomena. This paper proposes a re-adhesion control algorithm which uses the maximum adhesive effort by instantaneous estimation of adhesion force using load torque disturbance observer. Based on this estimated adhesive effort, the re-adhesion control is performed to obtain the maximum transfer of the tractive effort.

• Journal of the Korean Society for Railway
• /
• v.8 no.3
• /
• pp.216-221
• /
• 2005

In electric motor coaches, the rolling stocks move by the adhesive effort between rail and driving wheel. Generally, the adhesive effort is defined by the function of both the wright of electric motor coach and the adhesive effort between rails and driving wheel. The characteristics of adhesive effort is strongly affected by the conditions between rails and driving wheel. When the adhesive effort decreases suddenly, the electric motor coach has slip phenomena. This paper proposes a re-adhesion control based on disturbance observer and sensor-less vector control. The numerical simulation and experimental results point out that the proposed re-adhesion control system has the desired driving wheel torque response for the tested bogie system of electric coach. Based on this estimated adhesive effort, the re-adhesion control is performed to obtain the maximum transfer of the tractive effort.

• Journal of Distribution Research
• /
• v.4 no.1
• /
• pp.1-16
• /
• 1999

Although many studies have emphasized the importance of a saleperson's effort in the area of service marketing, no one has studied the variables which may influence, or may be influenced by salesperson's effort by customers. This study investigates the effects of percieved salesperson's effort on some performance variables and the effects of some selected variables on perceived salesperson's effort. Two sets of data were collected - one on the service of beauty hair shops and the other on that in fast food restaurants. The results indicate that empathy of employees is positively related to perceived effort, and perceived effort has the positive effects on satisfaction, trust, and long term relationship. However, the relationships between store image and perceived effort, and that between trust and long term relationship are only partly supported and the effects of perceived effort on long term relationship are not supported in our empirical tests.

• The KIPS Transactions:PartD
• /
• v.9D no.5
• /
• pp.865-876
• /
• 2002

Successful project planning relies on a good estimation of the effort required to complete a project, together with the schedule options that may be available. Existing software effort estimation models are present only the total effort and instantaneous effort function for the software life-cycle. Also, Putnam presents constant effort rate in each phase. However, the size of total effort varies according to the software projects under the influence of its size, complexity and operational environment. As a result, the allocated effort in each phase also differs from one project to another. This paper suggests models for effort allocation in planning, specifying, building, testing and implementing phases followed by the project size and development types. These models are derived from 155 different projects. Therefore, these models can be considered as a practical guideline in management of project schedule and effort allocation.

• The Research Journal of the Costume Culture
• /
• v.11 no.1
• /
• pp.103-117
• /
• 2003

The aim of this study was to identify dimensions of salesperson´s effort according to older female(55+) customer's and fashion store salesperson's perspective and to examine what kind of effort dimensions are assessed to be more important than others. As a method, both literature review and empirical research were made. This study was performed in three stage from December in 2001 to May in 2002. For exploratory step. In-depth interview and observation study were done for gathering responses related to salesperson´s effort. in pilot study, 83 older female customers were surveyed and the data was analyzed in order to develop questionnaire. In the main research. 202 older female customers and 103 fashion store salespersons were surveyed in order to identify the dimensions of salesperson's effort. Statistical analyses were performed with SAS program using factor analysis. cronbach´a mean, t-test. paired t-test and multiple regression analysis. The results of this study were as follows. First, 5 factors was selected for the dimensions of salesperson´s effort in customer´s perception; friendliness, attentiveness. product competence. effective access and special treatment. Second, 5 factors was selected for the dimensions of salesperson's effort in salesperson´s performance; friendliness/ attentiveness. product competence. effective access. communication, and purchase exaction. Third. dimensions of salesperson's effort were different according to customer and salesperson's characteristics. Last, there were significant differences in the salesperson's efforts between customers´perception and salespersons´Performance.

• Proceedings of the KIPE Conference
• /
• 2003.07b
• /
• pp.536-539
• /
• 2003

In electric motor coaches, the rolling stocks move by the adhesive effort between rail and driving wheel. Generally, the adhesive effort is defined by the function of both the weight of electric motor coach and the adhesive effort between rails and driving wheel. The characteristics of adhesive effort is strongly affected by the conditions between rails and driving wheel. When the adhesive effort decreases suddenly, the electric motor coach has slip phenomena. This paper proposes a re-adhesion control algorithm which uses the maximum adhesive effort by instantaneous estimation of adhesion force using load torque disturbance observer. Based on this estimated adhesive effort, the re-adhesion control is performed to obtain the maximum transfer of the tractive effort.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.8 no.4
• /
• pp.366-374
• /
• 2003

In electric motor coaches, the rolling stocks move by the adhesive effort between rail and driving wheel. Generally, the adhesive effort is defined by the function of both the weight of electric motor coach and the adhesive effort between rails and driving wheel. The characteristics of adhesive effort is strongly affected by the conditions between rails and driving wheel. When the adhesive effort decreases suddenly, the electric motor coach has slip phenomena. This paper proposes a re-adhesion control algorithm which uses the maximum adhesive effort by instantaneous estimation of adhesion force using load torque disturbance observer. Based on this estimated adhesive effort, the re-adhesion control Is peformed to obtain the maximum transfer of the tractive effort.

• Journal of the Korea Computer Industry Society
• /
• v.2 no.6
• /
• pp.859-866
• /
• 2001

Successful project planning relies on a good estimation of the effort required to complete a project, together with the schedule options that may be available. Despite the extensive research done developing new and better models, existing software effort estimation models are present only the total effort and effort (or manpower： people per unit time) function for the software life-cycle. Also, Putnam presents constant effort rate in each subcycles. However, the size of total efforts are variable according to the software projects under the influence of its size, complexity and operational environment. As a result, the allocated effort in subcycle also differ from project to project. This paper suggests the linear and polynomial effort estimation models in specifying, building and testing phase followed by the project total effort. These models are derived from 128 different projects. This result can be considered as a practical guideline in management of project schedule and effort allocation.

• Korean Parent-Child Health Journal
• /
• v.10 no.2
• /
• pp.147-157
• /
• 2007

Purpose: Assessment of stress and coping effort of hospitalized children's mother are very important factor to support and recover the children. The purpose of this study was to identify the stress and coping effort in mothers whose children are hospitalized. And analyzes the correlation between mother's stress and coping effort on the hospitalized children. Method: This study surveyed 70 mothers whose children are hospitalized. The data was collected for this study at one university hospital in Daejeon from June 1,2007 to July 10, 2007. The instruments used in this study were the mother's stress scale which was developed by Ok-Nam, You(1998), modified by Ho-Jin, Mun(2001), and the mother's coping effort were measured with the Coping Health Inventory for Parents(CHIP) developed by McCubbin and Patterson(1981). The data was analyzed by using SPSS program and include ANOVA, and Pearson's Correlation. Result: The mother's stress was average 2.42 out of a possible 4 points. Type of coping effort was in order of type III(cope with it by understanding medical circumstances)(M=2.73), type I(Cope with it through positive definition)(M=2.43), type II (cope with it by maintaining psychological stability)(M=2.28). Total coping effort according to general character of mothers whose children are hospitalized showed a significant difference in occupation(P<.05). Correlations between mother's stress and total coping effort was r=-.361(P<.05). Conclusion: This study based on nursing of stress and coping effort of hospitalized children's mothers. Pediatric nurses need to establish a stronger communication board and a relationship between medical staff and children's parents so that have supportive information. And to establish a support program that strengthens the coping effort of hospitalized children's mothers.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.16 no.5
• /
• pp.164-170
• /
• 2008

A typical clutch system for automotive manual transmissions transfers hydraulic pressure generated by driver's pedal manipulation to the clutch diaphragm spring. The foot effort history during the period of push is different than the period of the clutch pedal's return. The effort or load difference is called clutch foot effort hysteresis. It is known that the hysteresis is caused by friction. The frictional force and moment are produced between various component contact points such as between the rubber seal and the inner wall inside the hydraulic cylinder and between the diaphragm spring and the pressure plate, etc. Understanding the clutch pedal foot effort hysteresis is essential for a clutch release system design and analysis. The dynamic model for a clutch release system is developed for the foot effort hysteresis prediction and a simulation analysis is performed to propose a tool for analysing a clutch system.