• Journal of Technologic Dentistry
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• v.33 no.4
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• pp.313-321
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• 2011

Purpose: The purpose of this study was to compare color parameters of different fabrication method of Lava ceram powder, Lava DVS blocks, IPS e.max ceram and IPS e.max zirpress. Methods: The three available shades(A1, A2, A3.5) of Lava & Kavo zirconia blocks were examined. For each of three colors, three different thickness were tested, 5 times of measurement frequency. The measurements were made using a spectrophotometer equipped with an integrating sphere using the CIE $L^*$, $a^*$, $b^*$ colorimetric system. Results: Lava build-up group and Lava DVS group showed clinically perceived color difference, on the other hand IPS e.max build-up group and IPS e.max zirpress group did not show clinically perceived color difference to shade allowed on core. When the thickness of porcelain veneer increased from Lava and IPS e.max groups, color differences(${\Delta}E$) were decreased. Conclusion: All-ceramic system has color characteristics that clinicians have to consider when selecting materials. Also, manufacturers of different porcelain systems must make every effort to achieve color reproducibility.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.27 no.1
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• pp.9-16
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• 2003

According as the industry was developed, the pollution of the environment and atmosphere rose up to the surface. So, the focus is now concentrated on the engines of affinity for nature. And the investigators make more effort to the improvement in the performance of engines, depending to the prices of oil and the anxiety about the exhaustion of the fossil fuel go up. So the GDI engines head up for these necessities. In this experimental study, the spray flow characteristics for a commercial injector equipped in the present GDI engine were investigated, which had a strong influence on the engine performance and emissions. The experiment was performed at the injection pressures of 1, 3, 5 and 7MPa under the atmospheric condition. A PDPA system was used to specify the flow characteristics of the spray. Also, the global spray behavior classified into three regions as leading, main spray and vortex cloud region, was analyzed by using a visualization system. And the regions were compared with each other.

• Journal of Digital Contents Society
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• v.12 no.1
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• pp.115-122
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• 2011

The computer systems of many hotel businesses in Korea do not really succeed in keeping up with the rapidly developing IT technology. It is essential that they keep updating the information systems of hotels, which will eventually result in enhanced customer satisfaction. They also need to make every effort to develop and maintain appropriate computing systems to improve the quality of service to customers. This paper discusses how computers have been introduced to hotel businesses and how the intended goals have been materialized. We attempt to examine the information systems of some Korean hotels and see if there is any problem that needs to be solved. From the perspective of a general information system, we intend to make a proposal to optimize the computer system of the hotels.

• The Journal of Sustainable Design and Educational Environment Research
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• v.4 no.4
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• pp.39-54
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• 2004

In this study, the following findings were obtained: First, life-long educational system should be reinforced that can train and educate people to fit their situation and provide the necessary manpower in a just-in-time manner by getting away from the school-centered education and rapidly introducing the knowledge required in both the world market and the domestic market. This can be said to be the global trend in the ubiquitous age. Second, government should make efforts to build up the life-long educational system that can make the persons trained and educated in schools the manpower required by the state and society. Third, Life-long learning policy starts with providing for the system of lifting all kinds of limits and obstacles so that anyone needing learning can learn and his learning may not discriminated from schooling. For this policy or system to be effectively promoted, government should reinforce administrative and financial support system for investment in and research on the ubiquitous department. Fourth, It is quiet right that the very effort we are going give the super to the ubiquitous education is a shortcut to solving rapidly lots of problems heaped on our present life-long educational system.

• Journal of the Korean Society of Industry Convergence
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• v.2 no.2
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• pp.23-33
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• 1999

After studying several methods of the application a device of a treated sewage in anticipation of the future shortage of the duty of water, we could have some conclusion as the following : Advanced treatment systems arc essential prerequisites in reusing a treated sewage. And in a short term, the application of reusing a treated sewage should go first to new building areas near the sewage but for the long run, it should cover the whole area of Taegu, it is desirable that the pipe line networks which include dual water systems as well as water supply should be spread throughout the whole city. The city authorities have to make every effort to step up publicity activities on this plan to all the citizens and building owners to steadily carry out this project and encourage private constructors to participate with the help of SOC. And for the long run, it is desirable that the application of reusing a treated sewage should be obligatory.

• Proceedings of the CALSEC Conference
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• 2001.08a
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• pp.277-288
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• 2001

Nowadays, for the competitive power of an enterprise, there are many attempts to implement information system that could support business innovation by business process re-engineering. However, there is no effort to standardize the core business processes of enterprise based on standards of data, documents. These facts make it difficult to introduce and implement enterprise information system designed by business processes of the higher level. Therefore, standardization of business process by analyzing the functionality and relationships among them are important and necessary. The results of our research are summarized as process-driven standardization (standardization of core business processes) and development of a repository. In process-driven standardization, we proposed the reference model by analyzing the business processes of the leading enterprises for core business processes. The reference model focuses on core business processes, such as sales management, procurement management, production management, logistics management, and customer support in manufacturing industry. We developed a knowledge-based system as a repository for a integrated management system of business process. And this repository was built up web-based system for the purpose of both reference and management.

• Journal of Fashion Business
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• v.4 no.4
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• pp.71-82
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• 2000

The purpose of this thesis is how to find the way of activating Korean fashion industry, by reviewing the accomplishments of British young designers, Hussein Chalayan, who are contributors to the present peak activities of British fashion. Some results come over this depressive state of Korean fashion might be proposed. Firstly, Korean government should try to direct the Korean fashion associated group to make the unified and effective results in an organized way. Secondly, Korean fashion industries and university-level fashion school should have more intimate relationship and be closely communicated with each other. Also the fashion school should watch their curriculum. and change it gradually to the up-todate one. Thirdly, the Korean new generation designers should do effort to have the highest tailoring technique and artistic good sense. Finally, the designer should have broad range of knowledge for their design. In conclusion, the government, university-level fashion schools, fashion industries and fashion designers should be positively changed and cooperated to do the best and activate Korean fashion.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.337-341
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• 1994

This paper describes an effort to develop a simulator of Active Power Filter (APF) by three dimentional(3-D) space current co-ordinate. System current is represented by 3-D vector composed of three current components - active, reactive and distorted. %THD (%Total Harmonics Distortion) can be converted to height-angle of system current vector and power factor can be defined on 3-D space current co-ordinate without loss of generality. Current of APF and power system can be analyzed by 3-D visualization of current vector trajectory. So, the computer simulation results show that the proposed method by 3-D space current co-ordinate make up for disadvantages of performance evaluation on time / frequency domain.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.11a
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• pp.169-172
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• 2007

Sustainable interior design elements are related with human health. We know that a demand for environmental-friendly housing and all about the others demanding are for human health. We have to make up basement of natural environment for sustainable space composition. If natural environment is polluted that surrounded by human, we have to effort to revive without any pollution. We have to get accomplished stability, comfortable, security, convenience and organize interior design elements for sustainable space to enhance for the quality of life. Furthermore, it needs to get a respect lifestyle on personal. To study composing of the sustainable interior design, we arranged interior design elements to compose sustainable space of housing. We investigated how to compose energy-efficiency, sustainable, interior tree-planting, alterable of the space.

• Journal for History of Mathematics
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• v.16 no.1
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• pp.45-62
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• 2003

The goals of a major reform effort are to enable us to educate informed citizens who are better able to function in our increasingly technological society. Discrete mathematics is an exciting and appropriate vehicle for working toward and achieving these goals. it is an excellent tool for improving reasoning and problem solving skills. Discrete mathematics has many practical applications that are useful for solving some of the problems of our society and that are meaningful to our students. Its problems make mathematics come alive for students, and help them see the relevance of mathematics th the real word. To build up the role of Discrete mathematics in the school, this study is to investigate various theories and curricula related to discrete mathematics, and to collect a great deal of valuable material that will help teachers introduce discrete mathematics in their classrooms. In conclusion. mathematics teachers will find the need and importance of why and how discrete mathematics can be introduced into their curricula by this study.