• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.575-580
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• 2003

In this paper, we develop a control hardware such as an FPGA based general purpose controller with a DSP board to solve nonlinear control problems. PID control algorithms are implemented in an FPGA and neural network control algorithms are implemented in a DSP board. PID controllers implemented on an FPGA was designed by using VHDL to achieve high performance and flexibility. By using high capacity of an FPGA, the additional hardware such as an encoder counter and a PWM generator, can be implemented in a single FPGA device. As a result, the noise and power dissipation problems can be minimized and the cost effectiveness can be achieved. In order to show the performance of the developed controller, it was tested for controlling nonlinear systems such as an inverted pendulum.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2319-2324
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• 2003

This paper addresses the optimal design of dividing wall distillation column which is rapidly applied in a variety of chemical processes over recent several years because of its high energy saving efficiency. A general dividing wall column model which can cope with the heat transfer through the dividing wall is developed using rigorous computer simulation. Based on the simulation model, the effects of the internal recycle flow distribution around the dividing wall and the heat transfer across the dividing wall on overall system performance are investigated. An improved method is suggested to utilize the heat transfer through the wall to optimal column design. The suggested method is compared with the existing method via. simulation study and shows more improved energy saving result. Several control strategies for the divided wall column are tested and the optimal control strategy is propose

• International Commerce and Information Review
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• v.11 no.3
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• pp.101-123
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• 2009

This research which applied with Uses and Gratification Theory tried the comparative analysis between internet purchasers and internet non-purchasers by the user's motivation, attitudes, and behavior in Mongolia, By utilizing the two-group discriminant analysis method, which tested the hypotheses of this study. In Internet Market of Mongolia, This research classifies all internet consumers into internet purchasers, and non-internet purchasers and examines the differences in motivations, behaviors, and attitudes between the two groups; based on the assumption that these two groups have different needs and expectations while using the internet. The two group discriminant analysis was conducted to identify a lot of differences between the two groups. Research results show that important differences are found in motivations for using the Internet, attitudes toward the Internet, amount of Internet usage, and frequency of visiting a certain type of Web site. In the practical aspect, This result provides an understanding of the Mongolia Internet shopping, also it could give some valuable implication for the Internet company marketers who are trying to find out how to penetrate into Mongolia internet market.

• The Journal of Information Systems
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• v.9 no.1
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• pp.109-128
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• 2000

This paper examined the significance of Intellectual Capital. In recent years the number of companies whose value lies largely with their intellectual capital has increased dramatically. Dr. Margaret Blair of the Brookings Institute reported a significant shift in the makeup of company assets. In 1978, her study showed that 80 pecent of the firms＇value was associated with its tangible assets, with 20 pecent associated with its intangible assets. By 1998, only 30 pecent of the value of the firms studied was attributable to tangible assets while 70 pecent was associated with the value of their intangibles. This paper used the result of her study. This paper tested the correlation of enterprise value and intellectual capital, cash flow, net income and net assets. The results showed that the correlation of enterprise value and intellectual capital was most significant.

• Journal of Korean Academy of Nursing Administration
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• v.8 no.4
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• pp.633-643
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• 2002

Purpose : This study was conducted to develop a patient classification system for hemodialysis and to test its validity and reliability. Method : The process of the system development was as below. The lists of hemodialysis nursing activities were collected from literature and hemodialysis practice guideline and they were classified into 10 factors and 16 elements. And then, 4 classification levels were identified for each element. The content validity and interrater reliability of developed patient classification system were tested. Result & Conclusion : 10 factors of patient classification system for hemodialysis were consisted of psychosocial support, mobility, access, teaching, assessment, stability, supportive therapy, test, general nursing during hemodialysis, hemodialysis room management. According to validity and reliability results and experts' opinions, 4 classification levels revised to 3 classification levels and 2 elements were deleted. Finally, patient classification system were consisted of 10 factors, 14 elements, 3 classification levels, 3 categories.

• Journal of the Earthquake Engineering Society of Korea
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• v.18 no.1
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• pp.1-8
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• 2014

The purpose of this study was to investigate the performance of hollow reinforced concrete bridge column systems with reinforcement details for material quantity reduction. The proposed reinforcement details have economic feasibility and rationality and make construction periods shorter. A model of hollow reinforced concrete bridge columns was tested under a constant axial load and a quasi-static cyclically reversed horizontal load. As a result, proposed reinforcement details for material quantity reduction were equal to existing reinforcement details in terms of required performance. The companion paper presents the experimental and analytical study for the performance assessment of hollow reinforced concrete bridge column systems with reinforcement details for material quantity reduction.

• The Journal of the Acoustical Society of Korea
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• v.15 no.2E
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• pp.45-49
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• 1996

From the reverberation signals received in the shallower water, the surface scattered signals are identified by using the multipath eigneray model that provides launch angles, grazing angles and transmission loss from the high frequency directional source to and from the rough surface. For small scale surface waves, the perturbation method is used to compute the backscattering strength for various grazing angles and wind speeds. A scheme to inversely estimate the wind speed, by which the observed surface reverberation levels are produced, has been tested. In result, for low grazing angles the perturbation method can be used to predict the backscattering stregth, thereby the surface wind can be indirectly estimated.

• Culinary science and hospitality research
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• v.22 no.1
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• pp.117-125
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• 2016

This study investigated workplace harassment perceived by deluxe hotel employees, examined its effect on their turnover intent, and verified difference in workplace harassment perception according to demographics and job characteristics. Based on total 248 samples obtained from the empirical research, this study reviewed reliability and validity using SPSS program. The hypothesized relationships in the model were tested simultaneously by using regression analysis. The major findings are as follows. First, the disrespectful behavior(${\beta}=.362$), verbal aggression(${\beta}=.336$), and physical aggression(${\beta}=.135$) among workplace harassment have positive effect on turnover intent. Also, according to the result of examining differences in perception of workplace harassment in accordance with employees' demographics and job characteristics, the average values of those in their 20s and those whose working experience was five years or shorter were lowest and they were most exposed to workplace harassment. Limitations and future research directions are also discussed.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.45-46
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• 2015

Recently, the large amount of sulfur is globally generated by the development of the petroleum refining industry every year. In this study, without the use of the sulfur with a high melting point used in the previous studies, the modified sulfur mortar with addition of a melting point of about 65℃ were tested to determine their distribution and strength properties according to the mixing method and curing conditions. This study is a test to find out the Density, Absorption and Table Flow of the modified sulfur and general sulfur. As result, general industrial sulfur flow was lower, showed a high absorption rate.

• Journal of the Korean Society of Systems Engineering
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• v.15 no.2
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• pp.9-16
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• 2019

The most important task in acquiring the weapon system is to determine the required performance and to test & evaluate it. The importance of the weapon system by ROC (Required Operational Capability) is not considered, and system development and test evaluation are carried out. In addition, technical incidental performance is tested on the same basis as ROC in the test evaluation and determined according to the result. Development test and evaluation that evaluates technical ability is very important, but development agency is supervised and performed. In this paper, we propose a method to give weights considering the importance of ROC, a technical incidental performance determination and test procedure, and a improvement plan for the development and operational test & evaluation.