• 유체기계공업학회:학술대회논문집
• /
• 2003.12a
• /
• pp.80-87
• /
• 2003

Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions for a considerable amount of the time. This study aims at analyzing off-design performance characteristics of micro gas turbines and addressing the importance of the recuperator in the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration (fuel only control, variable speed operation, variable inlet guide vane control), and current vs advanced engines. Major finding is that maintaining turbine at high level is crucial in efficient operation of micro gas turbines.

• Journal of Family Resource Management and Policy Review
• /
• v.5 no.2
• /
• pp.13-27
• /
• 2001

The purpose of this study was to analyze which factor, influenced their change from pre-wage group to family business group. The subject of study classified by wage earner group and family business group. Independent variables effected by transform to family business group are classified by personal variables and workable variables. The major findings of this study are as followings: Sex, age, marriage of personal variables and pre-work time, pre-wage, wholesale - retail business, restaurant business and person service business of pre-industry of work variables had significant effect on transform to family business. Especially, Marriage group and low pre-wage income group significant effected on transfer to family business. By this, personal to transfer to family business can conjugate information of search and choice decision and can be used as a valuable data for future family business study.

• Journal of the Korean Home Economics Association
• /
• v.26 no.4
• /
• pp.53-65
• /
• 1988

In the study, the dietary survey was conducted in Seoul, Dae-jeon, Gwangju, Pusan, from march to April in 1988. A Questionnaire was prepared and distributed to 1583 house wives in order to find out their attitude of meal management and their way of thinking in dietary life. The results were summarized as follows: 1) 34.4% of the subjects prepared daily menu. In planning menu, the major consideration shifted from husband to all family members and the most emphasizes meal changed from breakfast to supper. 2) Most of the subjects were making use of substitute food. They were satisfied with the convenience and taste of the convenience foods. Improvements in nutrition, sanitation and price of convenience food made increase of its consumption. 3) The survey has shown that the main purpose of eating is to satisfy nutrition. and in the choice of food, most subjects regarded its taste as the most important factor.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.6 no.1
• /
• pp.71-98
• /
• 1998

The study proved the fitness between competitive strategy and service operation strategy of service companies. The competitive strategy of a corporation is a major strategy playing the role of bridge linking both corporate strategy and functional strategy. And it is a choice of method how to win competitors in given area. There have been such a specific methodologies for acquiring competitive advantage as Porters competitive strategy, Miles and Snows adaptive strategy, and Life cycle strategy. But, many scholars have pointed that its more important for high corporate performance to determine the competitive strategy of a corporation fitting the external environment and internal structure. So its needed for successful cost-leadership or differentiation strategy to differentiate organizational function, resources, and various organizational factors. But there have been no methodologies or practical guidelines fitting competitive strategy, corporate structure, and external environment in sprite do service corporations growth. So, the study proved the fitness between competitive strategy and service operation structure in Airlines after selecting service structural elements necessary for strategic management.

• Journal of Korean Institute of Industrial Engineers
• /
• v.16 no.1
• /
• pp.83-98
• /
• 1990

Previous studies have shown strong tendancy toward overconfidence in intuitive probability judgements. The purpose of the present study is to investigate the relations between this overconfidence phenomenon and the three major characteristics of information, namely, the pertinance, the redundancy and the quantity. An experiment was conducted where the subjects were asked to respond to 120 questions of the same type. In each question, the subjects' task was to predict, in the light of given information, which of the two given countries would have had higher GNP in 1979 and to give the probability that their choice would be correct. The results suggests that only the pertinance of information has significant influence on the degree of overconfidence.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.2052-2053
• /
• 2007

Recently, the importance of supplying the reliable electric power is increasing. Breaking insulation of stator winding is major cause of fault in rotator machine. On-line PD detecting is useful technique to diagnose rotator machine. However, interpretation of its results in time domain is very complex because of the mixed results with PD(Partial Discharge) and noise signal. Therefore, the results were analyzed in frequency domain by FFT (Fast Fourier Transform) to detect precise PD signals. The purpose of this paper is to describe the optimal frequency range to discriminate the PD and noise signal.

• Structural Engineering and Mechanics
• /
• v.11 no.1
• /
• pp.49-70
• /
• 2001

This paper is concerned with a study on thermo-elastoplastic characteristics of functionally graded composite. Compared to the classical layered composites, it shows a wide range of thermo-elastoplastic characteristics according to the choice of two major parameters, the thickness-wise volume fraction of constituents and the relative thickness ratio of the graded layer. Therefore, by selecting an appropriate combination of the two parameters, one is expected to design the most suitable heat-resisting composite for a given thermal circumstance. Here, we address the parametric investigation on its characteristics together with theoretical study on thermo-elastoplasticity and numerical techniques for its finite element approximations. Through the numerical experiments, we examine the influence of two parameters on the thermo-elastoplastic characteristics.

• Korean Journal of Bronchoesophagology
• /
• v.3 no.1
• /
• pp.137-147
• /
• 1997

The rarity of primary tumor of the trachea, which was recently estimated in a circumscribed population to be 2.7 new cases per million per year, explains the relatively limited experience that has been acquired even by major institutions. Although there may already by a high degree of airway obstruction, tracheal tumors are usually misdiagnosed as bronchial asthma or chronic bronchitis because of its nonspecific symptoms. Surgery is the treatment of choice. Recently, the authors experienced three cases of primary tracheal malignant tumors ; one case of mucoepidermoid carcinoma and two cases of adenoid cystic carcinoma. The authors report on these cases with a review of the literature for give help in differential diagnosis and treatment planing of tracheal tumor.

• Journal of Arbitration Studies
• /
• v.31 no.1
• /
• pp.55-81
• /
• 2021

Awarding interest in international arbitration remains one of the most challenging areas for tribunals and parties given the myriad of issues that arise. This article seeks to provide an overview of how international arbitral tribunals grant delay interest. It reviews the various issues that international arbitral tribunals face concerning pre-award and post-award interest, determining the appropriate interest rate, surrounding simple or compound interest, and the complex issue of choice of law. A comparative context is provided by surveying the laws of major jurisdictions from both the common law and civil law and the regulations of leading arbitral institutions. It concludes with a review of the law, jurisprudence, and practice in Korea related to delay interest and how Korean tribunals under the KCAB Domestic and International Rules have determined delay interest in recent years.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.25 no.3
• /
• pp.395-403
• /
• 2019

This paper compares the marine engineering courses of two maritime institutions: Mokpo National Maritime University of Korea in the East Asia region and Philippine Merchant Marine Academy in the Southeast Asia region. It shows examines educational marine engineering programs, along with the different divisions and courses at each college. It demonstrates a divergence in methodologies and course offerings to cultivate competitive graduates. The comparative assessment completed is intended to offer broader knowledge on how each institution tackles the requirements of the STCW, and to meet the present and future demands of the maritime industry. Different course offerings are compared along with the units and hours allocated to each subject, and the differences in marine engineering academic and training requirements to graduate. Students must satisfactorily earn 150 units to complete their choice of major. Statistical procedures were used in this assessment and analysis from Excel programs.