• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.663-670
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• 2019

Corrective thermal performance analysis is required for power plants' turbine cycles to determine the performance status of the cycle and improve the economic operation of the power plant. We developed a sectional classification method for the main feed-water flow to make precise corrections for the performance analysis based on the Performance Test Code (PTC) of the American Society of Mechanical Engineers (ASME). The method was developed for the estimation of the turbine cycle performance in a classified section. The classification is based on feature identification of the correlation status of the main feed-water flow measurements. We also developed predictive algorithms for the corrected main feed-water through a Kernel Regression (KR) model for each classified feature area. The method was compared with estimation using an Artificial Neural Network (ANN). The feature classification and predictive model provided more practical and reliable methods for the corrective thermal performance analysis of a turbine cycle.

• Korean Journal of Labor Studies
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• v.24 no.2
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• pp.409-441
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• 2018

This study is a case study about the Valero Energy Corporation, the largest American independent refinery company, examining the characteristics of human resource management as a union avoidance strategy. The main research questions here are whether union substitution strategy differs clearly from union suppression strategy in the context of Valero Energy. Since the establishment in 1980, the Valero had maintained non-union tradition. The typical examples of human resource management in the non-unionized American companies are easily found in the Valero, such as strong CEO leadership, manpower policy emphasizing corporate culture and teamwork, direct communication between company and individual employees, no lay-off policy and no outsourcing policy of HRM, salary level around average of industry and best level of fringe benefits in the industry, non-union tradition and well-functioned alternative dispute resolution system and so on. Until now, based on tremendous growth and profitability, the company have applied union substitution method adopted by good companies as concrete method of union avoidance strategy instead of union suppression method that marginal enterprise prefers.

• Journal of Digital Convergence
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• v.20 no.3
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• pp.349-357
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• 2022

Drum Set are representative instruments that use grips in modern popular music. Depending on how and how clearly you hold the basic grip, it also affects your performance ability. The purpose of this study is to analyze the characteristics, strengths, and weaknesses of each grip, derive the resulting complex effects, and present practical application plans to the drummers. The research method is largely divided into traditional and matched grips, and in detail, German, American, French, and hybrid styles are included to analyze the performance method utilized. It also refers to the grip method of all drummers from the 1930s to the present, which was registered in Drummer World, an overseas drum site. This study proposed several application plans by classifying and analyzing the most basic grip methods in drum set in detail. I was able to see that the performance impact was different depending on the grip, and I think it will be more helpful for future performances if I understand both the positive and adverse functions of each grip and play it.

• The Journal of the Korea Contents Association
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• v.17 no.6
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• pp.116-123
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• 2017

This research was designed to seek and plan the foreign tourists visiting the National Hangeul Museum revitalization method; foreign tourists in this research refer to Japanese, Chinese and Americans tourists since they make up the big proportion of foreign tourists visiting the National Hangeul Museum. This research was aimed to seek the visiting revitalization method through correlation analysis among: foreign tourists' visiting purpose, requested improvement on exhibition facility and service, satisfaction level on exhibited contents and service quality, overall satisfaction level on viewing exhibition and behavior intention. As the result of research, tourists visiting purpose from three countries showed a difference; American and Japanese tourists picked 'guidance system in foreign language' while Chinese tourists picked 'experiment programs' as the most requested improvement on exhibition facility and service. Also, Tourist' satisfaction level on exhibited contents and service quality showed a difference among tourists from three countries; American tourists' satisfaction level was shown higher than that of Japanese and Chinese tourists. In addition, American tourists' overall satisfaction level on exhibition and behavior intention after viewing the exhibition in National Hangeul Museum tends to be higher than that of Japanese and Chinese tourists. Based on this research, visiting revitalization method to attract more foreign tourists to the National Hangeul Museum, such as contents development is suggested in the research.

• Korean Journal of Ecology and Environment
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• v.52 no.2
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• pp.143-150
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• 2019

Although inconspicuous marsh birds are an indicator of marsh health, there is little understanding of their status and population trends due to their behavioral characteristics and lack of reliable survey methods in Korea. We applied the Standardized North American Marsh Bird Monitoring Protocols(SNAMBMP) already validated in North America for effective survey of the marsh birds. We selected 29 sites with emergent marshes, rice fields and riparian forests in Seocheon-gun, Buyeo-gun and Gunsan-si. We conducted the survey with a combination of passive 5 minute point-count and vocal survey method (30 seconds call-broadcasting+30 seconds silence) that was targeted eight species 2~7 times/site from March to July 2017. Four species, Brown-cheeked Rail(Rallus indicus), Ruddy-breasted Crake (Porzana fusca), Watercock (Gallicrex cinerea) and Greater Painted-snipe (Rostatula benghalensis), were detected at one site respectively (naïve occupancy rate=0.035). Vocal survey method with conspecific call-broadcasting provided better on Brown-cheeked Rail and Watercock than the others. We suggest a combination of passive point-count and vocal survey method like SNAMBMP to monitor inconspicuous marsh birds at nationwide scale and collection of sound files through recording of the entire process during the survey.

• Industrial Engineering and Management Systems
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• v.10 no.2
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• pp.170-177
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• 2011

We present an improved binomial method for pricing financial deriva-tives by using cell averages. After non-overlapping cells are introduced around each node in the binomial tree, the proposed method calculates cell averages of payoffs at expiry and then performs the backward valuation process. The price of the derivative and its hedging parameters such as Greeks on the valuation date are then computed using the compact scheme and Richardson extrapolation. The simulation results for European and American barrier options show that the pro-posed method gives much more accurate price and Greeks than other recent lattice methods with less computational effort.

• Journal of Ship and Ocean Technology
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• v.4 no.2
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• pp.1-12
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• 2000

The present study concentrates on the weak-scatterer hypothesis for the nonlinear wave-body interaction problems. In this method, the free surface boundary conditions are linearized on the incoming wave profile and the exact body motion is applied. The considered problems are the diffraction problem near a circular cylinder and the ship response in oblique waves. The numerical method of solution is a Rankine panel method. The Rankine panel method of this study adopts the higher-order B spline basis function for the approximation of physical variables. A modified Euler scheme is applied for the time stepping, which has neutral stability. The computational result shows some nonlinear behaviors of disturbance waves and wave forces. Moreover, the ship response shows very close results to experimental data.

• Journal of the Korean Society of Safety
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• v.8 no.1
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• pp.47-53
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• 1993

Residual Deformation Analysis(RDA) is a new method for ratings of the continuous bridges. The RDA makes it possible to expand the inelastic steel girder bridge design method set forth in the American Association of State Highway Officals'(AASHTO) Guide Specifications for Alternate Load Factor Design Procedures for Steel Beam Bridges Using Braced Compact Sections(1986) into an inelastic rating method. It is a method to assess the residual moments and deformations that are set up in a beam that has been loaded into the post-elastic range This method combines classical elastic conjugate beam theory with linear moment-rotation relationships for midspan inelastic positive moment. The limit state is inelastic serviceability limit. which is defined as the ratio of the span to midspan inelastic deflection(C=L/D).

• The Korean Journal of Food And Nutrition
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• v.24 no.4
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• pp.808-816
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• 2011

The aim of this study was to compare the American, Chinese, and Japanese consumers' usage behavior of marketing communication towards overseas Korean restaurants. The survey included both on and off-line method and self-administered questionnaires were written in three languages- English, Chinese and Japanese. The sample was collected from 5 hub cities for globalization of Korean food- LA, New York, Tokyo, Beijing, and Shanghai. The most important factor of searching for Korean restaurants-related information was 'the interaction' and the least one was 'the diversity'. The most commonly informed Korean restaurants-related content through the on and off-line media was 'the general information, such as location, telephone number, and operation hour'. Korean restaurants-related content that the respondents' most interested in was 'the information of menu and price'. Results of this study can expectedly be used from a practical point of view by providing empirical data of foreign consumers for effective marketing communication strategies of overseas Korean restaurants.

• Advances in Computational Design
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• v.1 no.1
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• pp.1-25
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• 2016

Domes are architectural and elegant structures which cover a vast area with no interrupting columns in the middle, and with suitable shapes can be also economical. Domes are built in a wide variety of forms and specialized terms are available to describe them. According to their form, domes are given special names such as network, lamella, Schwedler, ribbed, and geodesic domes. In this paper, an optimum topology design algorithm is performed using the enhanced colliding bodies optimization (ECBO) method. The network, lamella, ribbed and Schwedler domes are studied to determine the optimum number of rings, the optimum height of crown and tubular sections of these domes. The minimum volume of each dome is taken as the objective function. A simple procedure is defined to determine the dome structures configurations. This procedure includes calculating the joint coordinates and element constructions. The design constraints are implemented according to the provision of LRFD-AISC (Load and Resistance Factor Design-American Institute of Steel Constitution). The wind loading act on domes according to ASCE 7-05 (American Society of Civil Engineers). This paper will explore the efficiency of various type of domes and compare them at the first stage to investigate the performance of these domes under different kind of loading. At the second stage the wind load on optimum design of domes are investigated for Schwedler dome. Optimization process is performed via ECBO algorithm to demonstrate the effectiveness and robustness of the ECBO in creating optimal design for domes.