• International Journal of Fluid Machinery and Systems
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• v.5 no.3
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• pp.109-116
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• 2012

Water hammer pumps can effectively use the water hammer phenomenon for water pumping. They are capable of providing an effective fluid transport method in regions without a well-developed social infrastructure. The results of experiments examining the effect of the geometric form of water hammer pumps by considering their major dimensions have been reported. However, these conventional studies have not fully evaluated pump performance in terms of pump head and flow rate, common measures of pump performance. The authors have focused on the effects on the pump performance of various geometric form factors in water hammer pumps. The previous study examined how the hydrodynamic characteristics was affected by the inner diameter ratio of the drive and lift pipes and the angle of the drive pipe, basic form factors of water hammer pumps. The previous papers also showed that the behavior of water hammer pump operation could be divided into four characteristic phases. The behavior of temporal changes in valve chamber and air chamber pressures according to the air volume in the air chamber located downstream of the lift valve was also clarified in connection with changes in water hammer pump performance. In addition, the effects on water hammer pump performance of the length of the spring attached to the drain valve and the drain pipe angle, form factors around the drain valve, were examined experimentally. This study focuses on the form of the lift valve, a major component of water hammer pumps, and examines the effects of the size of the lift valve opening area on water hammer pump performance. It also clarifies the behavior of flow in the valve chamber during water hammer pump operation.

• Journal of Korean Academy of Nursing
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• v.29 no.6
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• pp.1392-1402
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• 1999

This study was carried out to find out stress-eating relationship in obese high school girls and to investigate the factors related to stress-induced eating. The conceptual framework used in this study was individual difference model. The research method was methodological triangulation. The data of the study were collected from purposively sampled 309 normal high school girls and 314 obese high school girls in S city. 15 volunteers, obese high school girls, enrolled in this qualitative research. Quantitative data was collected from May 6 to June 10, 1997 through questionnaires about stress and stress-related eating changes and from June 23 to August 26, 1997, qualitative data was collected. The results of the study were as follows : 1. Obese high school girls were unaffected by stress(t=-1.84, p=0.0662). 2. Through quantitative analysis, obese people divided into two groups in their response to stress. One group was composed of stress- eater. The other group was composed of non- stress eater. 3. Disinhibition(t=-3.1275, p=0.0019), cognitive restrain (t=-3.1597, p=0.0017), hunger(t=-3.5878, p=0.0004) were significantly different between stress-eaters and non-stress eaters. 4. According to the interview, 5 subjects of obese girls were stress eaters, and 10 subjects were non-stress eaters. Through qualitative research, the related factors of eating were eating attitude & behavior, stimuli situations on eating, and personality. In stress-eater group, they constantly went on a diet, however, they were prompted to eat when an uneasy feeling such as anxiety, depression, annoyance developed. Their personality were entirely optimistic. Whereas non-stress eater group had no interest in diet and didn't appear to have psychological factors to stimulate eating in stressful situations. Their personality was not only optimistic but also keenly characteristic. 5. To compare obese-normal high school girls on the effect of stress in eating. Normal weigh high school girls decreased their eating when stressed(t= -13.62, p=0.0001). In conclusion, this study suggests that there are two different groups in obese high school girls in regards to eating responses on stressful situations. As a result of these finding, clinical and school nurses can detect the stress-eaters who need stress management intervention, and can apply appropriate management program according to the individual needs.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.19 no.1
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• pp.21-31
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• 2013

Background: The purpose of this survey is to determine the job and task satisfaction of physiotherapists. These are important factors because they are directly connected to both morale and work efficiency. Methods: Data was collected from March 9th, 2013 to April 15th, 2013 using self-administered questionnaires. First, Cronbach Alpha coefficient was used to evaluate date reliability. Further data analysis used mean and standard deviation to determine frequency and satisfaction for each characteristic. To determine the significance of job and task satisfaction, T-test and an analysis of variance were performed. Also, regression analysis was used to find out a relation between job satisfaction of physiotherapist and task satisfaction of orthopaedic physical therapy. Result: This survey includes results from 197 physiotherapists who engage in orthopaedic physical therapy from major, medium and small cities. The general characteristics of survey respondents include: 112 males (56.9%), 85 females (43.1%); 123 in their twenties (62.4%), 56 in their thirties (28.4%), and 18 over forty (9.1%); 156 had less than five years work experience in orthopaedics, 25 had six to ten years, and 16 had more than eleven years work experience. In the physiotherapist's job satisfaction survey (out of 5), males averaged 3.71 and females averaged 3.43. Individuals with less than five years in the career averaged 3.5, 3.69 for between 6 to 10 years in career, 3.87 for over 11 years in career; this showed a significant difference. Results of the sub-factors of job satisfaction were 3.81 for self-esteem and 3.21 for prospect of occupation. Results of task satisfaction in orthopaedic therapy showed a significant difference between 4.03 for males and 3.66 for females. For sub-factors of task satisfaction scores were 3.81 for vision, 4.29 for task adoption, and 3.57 for task recognition. Conclusion: Physiotherapists will be satisfied when their motivation to work and morale are increased by concerns such as improving the education environment, expert physiotherapist adoption issue, and medical law revision.

• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.337-346
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• 2015

This study has been conducted for the purpose of elucidating the factors that are affecting the job performances and how this factors have affected the satisfactory of medical record technicians working at general hospitals in south Korea. This study had 428 participants from 60 general hospitals, located in Seoul and 4 different metropolitan cities such as Incheon, Daegu, Gwangju and Daejeon. This study was performed through using the standardized self-administered questionnaires As a result, the job satisfaction had a significant relationship with the participants monthly income, age, position of the job, BMI, satisfactory in performances, consideration of changing the career, having a breakfast regular exercises, and having a perception on socioeconomic status of oneself. Particularly, the hierarchical multiple regression analysis had shown that possessing the appropriate characteristics that are required in that field of career had a high correlation with the job satisfactory. In the future, this study suggests that need of appropriate interventions of work-related characteristics are required in order to improve the job satisfaction of medical record technicians.

• Korean Journal of Health Education and Promotion
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• v.15 no.2
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• pp.143-161
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• 1998

The purpose of this study is to find out the educational needs for the coronary heart disease patients of a general hospital in a municipal general hospital. The study subjects were 90 outpatients who had been diagnosed as myocardial infection or angina at the hospital from January 3, 1998 to January 31, 1998. The questionaire was consisted of risk factors and educational needs for coronary heart disease patients. The qusetions on the education needs of the coronary heart disease were consist of 34 questions in 6 fields. In analyzing the data, the number and the percentage were calculated in patients general characteristics, the average and the standard-deviation were calculated to understand the educational needs, t-test and ANOVA were used to find out inter group difference on educational needs. In ANOVA, the advanced analysis was done by Scheffe-test. The results of this study were as follows: 1. 52(57.8%) of the patients (90%) live in Kangnung-city and 95% of the patients live in the middle-east part of Korea. At the age distribution 39 to 80, 41.1% of the patients were in their sixties and average age was 62.4 years old. 40% of the patients left school in mid-course or graduated from middle school or high school 2. As a result of the study on the risk factors of the coronary heart disease, the patients who have hypertension and diabetes were 41.1% and 20% respectively. In smoking and drinking, smokers were 30% and drinkers were 40% and average of smoking and drinking duration over 30 years old. 47.8% were over 140mgHg systolic - BP and 45.8% were over 90mmHg diastolic - BP 3. The patients' educational needs average 94.88 (maximum 134), and item average 2.79(maximum 4.0), the highest needs field was the characteristic of disease 33.22(maximum 44). Item average 3.02 (maximum 4.0) and the lowest education needs field was the physical activity and exercise 10.21(maximum 16). Item average 2.55(maximum 4.0) 4. General characteristics which were different from the general characteristic educational needs were statistically different by group of educational level, occupation, age and sex. 5. The risk factors which were different from the coronary heart disease patients' risk factors educational needs were statistically different by groups of the heart disease patients in family and the patients who take regular exercise. with a result the nurses need to improve the educational programs while considering the high educational needs field and the characteristics which showed significant concerns statistically.

• Journal of Korea Game Society
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• v.9 no.6
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• pp.69-77
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• 2009

Game producers provide their products and service to users. But the need and desire of users change in many ways as time goes. But game Co. Ltd is difficult because of the capital and the technical identities for providing characteristic products and service etc. Specially, the FPS game which is popular among users is developed by game Co. Ltd as the maximum reflects desire of users, but is similarly developed in other companies FPS game by similar desire. This cannot accept from desire of a certain prospective customer furthermore, decrease of a loyalty customer and a new customer, and a company is difficult of market activity. Therefore, this research is to find of user's psychological needs by FPS game user after gaming on reusing intention and switching intention factors influencing. As the result, the intention of satisfaction and re-use for FPS game is 84.9%, the conversion intention to special force game is 9.6% and the conversion intention to the game of Sudden attack is 5.5%. It shows that desire of the user for certain games is changing.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.61 no.1
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• pp.23-28
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• 2012

The market of domestic Power Plant Generator Protection and Control System (GPCS) is narrow and required the high reliability, and technology. So, it is still operated as turn-key. In recent years, digital relays has evolved into IED can perform the control and monitoring functions without central monitoring based on IEC61850 international standards communications, and attention for advancement of smart grid and ECMS has been increased in South Korea. The increasing attention on multi-function IED, DGPS(digital generator protection system), for internal fault protection of large generator results in starting a national project in South Korea, the IED prototype development for next-generation power units. The voltage restrained overcurrent relay have been used as back-up overcurrent protection for generators. In this paper, voltage restrained overcurrent relay is one of the back-up protective factors in generator protection IED was presented. For evaluation performance of the voltage restrained overcurrent relay, the data of ATPDraw5.7p4 modeling was used.

• Journal of the Korean housing association
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• v.16 no.4
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• pp.17-28
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• 2005

The purpose of this study was to find out the residents' needs fur rural houses and to suggest the policy directions for developing Korean rural viewscape houses. The subjects were 386 houses and residents. They were selected according to accessibility, area characteristics, administrative district, and village types. The data were collected by using the interview and observation method based on the questionnaire. By analyzing the residents' needs for rural houses, the following conclusions were derived: 1) In order to preserve the rural characteristic, the government should lead to establish the yard space and the exterior design factors such as wall material and color, and the shape, material, and color of roof. 2) At the same time, the government should provide the residents with the subsidy for house improvement, so that they can build the desirabe size of house and the aged remodel their houses. 3) The contemporary design model of rural Han-ok should be developed and built. 4) The new rural house model improving roof design should be developed, because present houses with slab roofs and skirt roofs spoil the harmony with the rural natural environment. 5) The direction of rural houses for viewscape was defined as to satisfy residents' needs for convenient housing lift and to harmony visual and physical factors - building form, material and color - involving Korean rural housing culture.

• Progress in Superconductivity and Cryogenics
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• v.5 no.1
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• pp.13-16
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• 2003

Adhesion of $SrZrO_3$ resistive oxide barrier on Ag sheathed Bi(2223) tapes prepared by the sol-gel and dip-coating method was evaluated with an aid of Taguchi method and Lie($2^1{\times}3^7$) orthogonal arrays to determine the optimal process combination of levels of factors that best satisfy the bigger is better quality characteristic (QC=B). For analyses of results statistical calculations such as average and analysis of variance (ANOVA) were employed to analyze the results for improving the performance qualities of the dip-coated $SrZrO_3$ film. Experimentally, the performance of the films was evaluated in terms of bond strength by varying Sr/Zr moi ratio (A), amount of organic vehicle additives (B), drying temperature (C) and time (D), heat treatment temperature (E) and time (F), respectively. The optimal combination of levels of factors was determined to be $A_3B_2C_3D_2E_1F_3$ having a 90% confidence level.

• Journal of Advanced Marine Engineering and Technology
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• v.27 no.1
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• pp.57-64
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• 2003

The characteristics of fuel spray have an important effect on engine performance such as power, specific fuel consumption and emission because fuel spray controls the mixing and combustion process in an engine. Therefore, if the characteristics of fuel spray can be measured, they can be effectively used for improving engine performance. The major factors controlling fuel spray are injection pressure, ambient pressure and engine speed. In this study, the experiment is performed in a high temperature and high pressure chamber. In experiments, spray tip penetration, spray angle and spray tip velocity are measured at various injection pressure (10 and 14 MPa), ambient pressure(3,4 and 5 MPa), fuel pump speed(500, 700 and 900 rpm). Experimental results are useful for deriving an experimental spray equation and design an optimal engine. The results showed that injection pressure, ambient pressure and fuel pump speed are important factors influencing on the characteristics of spray. 1) Injection pressure influences on the characteristics of spray. That is, as injection pressure is increased, spray angle is decreased but spray penetration and spray tip velocity is increased. 2) Spray angle and spray penetration are increased as fuel pump speed is increased.