• Journal of Advanced Marine Engineering and Technology
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• 제37권3호
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• pp.274-281
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• 2013

The variable demand on the energy market requires a great flexibility in operating hydro turbines. However, Francis turbine operated at off-design conditions poses technical challenges related to large unsteady forces given by residual swirl and angular momentum. In order to improve the performance of a Francis turbine, the paper presents a numerical investigation of the 3D flow in the turbine at off-design conditions and discusses the influence of variable guide vane openings on the internal flow of a Francis turbine with the help of computational fluid dynamics. First, the internal flow characteristics of Francis turbine operated by varied guide vane angle at off design condition are computed and the optimal guide vane angle is obtained. Secondly, the Francis turbine is operated with guide vane number varies at the optimal guide vane angle. Finally, pressure contours and velocity distributions in the distributor are discussed and compared.

• Ocean Systems Engineering
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• 제3권4호
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• pp.309-325
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• 2013

Ocean Thermal Energy Conversion (OTEC) systems utilize the temperature difference between the surface water and deep ocean water to generate electrical energy. In addition to ocean surface waves, wind and current, in certain locations like the Andaman Sea, Sulu Sea and the South China Sea the presence of strong internal waves may become a concern in floating OTEC system design. The current paper focuses on studying the dependence of the CWP hydrodynamic drag on relative velocity of the flow around the pipe, the effect of drag amplification due to vortex induced vibrations and the influence of internal waves on the floating semi and the cold water pipe integrated OTEC system. Two CWP sizes are modeled; the 4m diameter pipe represents a small scale prototype and the 10m diameter pipe represents a full commercial size CWP. are considered in the study.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.13-18
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• 2010

본 연구는 Kerosene-LOx를 추진제로 하는 가스발생기용 스월 동축형 인젝터의 리세스 길이에 따른 내부 혼합 유동의 특성 파악을 목표로 하였다. 리세스 길이는 분무 안정성, 내부 LOx post 손상 등에 영향을 미치는 중요한 요소로 액막두께, 매니폴드 압력 측정 및 내부 유동 가시화를 통해 리세스의 영향을 분석하였고, 추진제 혼합 전후의 액막두께 변화를 측정함으로써 주파수 특성을 분석하였다.

• 산경연구논집
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• 제9권4호
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• pp.7-17
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• 2018

Purpose - This study aims to investigate domestic wine consumption behavior and make future sales strategies and marketing plans. Research design, data, and methodology - To achieve the purpose of the study, the surveys were conducted targeting 350 wine customers in Jeju and Seoul. 331 responses were collected, and out of them, 21 responses were deleted because they lacked the proper information fill in. A descriptive statistical analysis was applied to the remaining 310 responses. The statistical techniques used for carrying out hypothesis-testing are EFA_(exploratory factor analysis), multiple-regression analysis, and moderating effect in SPSS 18.0. Results - The results indicate that fashion oriented, sociality aspiration and rationality seeking lifestyles had significant influence upon internal attributes. However, well-being oriented and having enjoyment oriented lifestyle had no significant influence upon internal attributes. Furthermore, all the types of lifestyles except social aspiration lifestyles had a positive influence upon external attributes, whereas internal or external attributes had positive influence on customer satisfaction. Conclusions - The consumers who experienced wine purchases think wine selection attributes differ before and after experiencing wine drinking, and it shows that the circumstantial variables as purchase situations prove to be important predicted variables in the behavior field of wine consumers. It implies appropriate wine education according to the consuming trend about wine for wine consumers are needed.

• 한국직업건강간호학회지
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• 제21권3호
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• pp.299-307
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• 2012

Purpose: This descriptive study attempted to identify the influence of internal marketing perception, empowerment, and job satisfaction on customer orientation of clinical nurses. Methods: The subjects were 411 nurses with over one year working experience in a university hospital, located in I-city. The data were collected from April 20 to 30, 2012. using a self-report questionnaire. The data were analyzed using hierarchical multiple regression with the SPSS/WIN 17.0 program. Results: There were significant differences in customer orientation depending on general characteristics(age, marital status, education, position, clinical experience, and department). Internal marketing perception, empowerment, and job satisfaction correlated with customer orientation. As the results of hierarchical multiple regression analysis for impact factors on nurses' customer orientation show, factors are the outpatient department in working places(${\beta}$=.10), education and training in internal marketing perception(${\beta}$=.12) and empowerment(${\beta}$=.44), which accounted for 31.1% of customer orientation. Conclusion: Therefore, nurse managers should identify the needs to perceive nurses as internal customers, and the internal marketing strategy should be performed to empower nurses. Also, it is needed to place nurses with high customer orientation at the outpatient department.

• 한국IT서비스학회지
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• 제14권3호
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• pp.49-65
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• 2015

As South Korean large business groups, also known as Chaebol, have broadened their influence in the domestic economy, it is important to analyze the influence of internal transactions among Chaebol affiliates on their performance. In this paper, relationship between internal transactions and efficiency of Chaebol affiliates has been analyzed. Top five Chaebol groups in South Korea are selected; they include Samsung, Hyundai Motors, LG, SK, and Lotte group. Based on internal transactions among affiliates, social networks are constructed for each Chaebol group to analyze centrality, network structures and cliques. Data Envelopment Analysis (DEA) was conducted to examine the efficiency of the Chaebol affiliates. Then, correlations between the degree centrality and the efficiency of Chaebol affiliates were analyzed, and the network structures of Chaebol groups are presented. The result shows that positive correlations between degree centrality and efficiency are observed among four Chaebol Groups. This paper shows that the Social Network Analysis (SNA) techniques can be used in the empirical research for the analysis of internal transactions of Chaebol groups.

• 한국식생활문화학회지
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• 제24권1호
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• pp.58-68
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• 2009

This study examines the impact of the perception that employees of contract foodservice management companies have of internal marketing on service quality. Questionnaires were delivered to 291 employees employed in foodservice management companies. High perception item of internal marketing was 'value of formula education program' (3.36 points), whereas 'adequate allowance disbursement' (2.62 points) and 'various vacation benefits' (2.66 points) scored low. High service quality items for customers were 'kindness to customers' (3.89 points) and 'willingness to help customers' (3.89 points), whereas 'comprehension of customers' special requests' (3.63 point) and ['meeting customer expectations'] (3.64 points) scored low. The internal marketing conceived by employees of contract foodservice management companies has a positive influence on service quality. The most influential internal marketing variable to affect service quality was 'communication' followed by 'education/environment' and 'fringe benefits/[decisive] delegation'.

• 한국유체기계학회 논문집
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• 제3권1호
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• pp.28-36
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• 2000

For the improvement of the pump characteristics in the partial capacity range, it must be verified that the influence of the impeller design factor on the internal flows and the influence of the impeller internal flows on the pump characteristics. In this paper, in order to understand the influence of outlet angles on flow conditions and characteristics of a mixed flow pump, experiments were carried out for four kinds of impeller, which have the same inlet angle distributions and meridional section shapes. Results shown that separation and stall in the partial capacity range were enlarged by the outlet angles. The relationship between the separation and the stall at the impeller and the discharge flow conditions were clarified.

• 대한기계학회논문집B
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• 제21권8호
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• pp.1034-1045
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• 1997

For the improvement of the pump characteristics in the partial capacity range, it must be verified that the influence of the impeller design factor on the internal flows and the influence of the impeller internal flows on the pump characteristics. In this paper, in order to understand the influence of inlet angles on flow conditions and characteristics of a mixed flow pump, experiments were carried out for three kinds of impeller, which have the same outlet angle distributions and meridional section shapes. Results show that separation and stall in the partial capacity range can be controlled by the inlet angles. The relationship between the separation - stall at the impeller leading edge and the discharge flow conditions is clarified.

• 한국콘텐츠학회논문지
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• 제14권1호
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• pp.374-385
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• 2014

본 연구의 목적은 한국수자원공사의 종업원 직무만족에 영향을 미치는 내부마케팅 요인 중 교육훈련, 보상제도, 의사소통, 권한위임의 선행변수가 직무만족과 인지적 기업성과에 미치는 영향을 파악하고, 내부 마케팅, 직무만족, 인지적 기업성과 등에 대한 문헌적 고찰과 한국수자원공사 내부고객을 대상으로 설문조사를 통한 실증분석을 실시하여 한국수자원공사 고객만족도 향상을 위한 시사점을 제시하는 것이다. 한국수자원공사의 직무만족을 설명하는 4개의 요인에 대한 로지스틱 회귀분석 결과, 교육훈련, 보상제도, 의사소통요인이 유의한 것으로, 권한위임은 유의하지 않은 것으로 나타났고, 인지적 기업성과의 경우, 교육훈련과 의사소통요인이 유의한 것으로 보상제도와 권한위임요인은 유의하지 않은 것으로 나타났다. 내부마케팅요인이 한국수자원공사의 성공에 적용될 수 있음을 알 수 있었다.