• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.11
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• pp.5397-5402
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• 2012

Accidents involving electric equipment and economical loss by power quality deterioration related to harmonics show a rising tendency A passive filter is economic and efficient in suppressing harmonics but many engineers and designers are reluctant to install a passive filter to defect harmonics at their power system because of problems such as harmonic amplification and the probability of generating series or parallel resonance with the power system. This work introduces that passive filters will be very available to defeat harmonic problems of the power system if passive filters are well designed. We describe method and process of harmonic passive filter design. And the passive filter for the power system having harmonic problems due to use of nonlinear loads like as 100HP DC motor system, an extruding machine, an air blower and other loads are designed. Experimental results verify the performance of the passive filter designed by the described method and procedure.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.11
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• pp.4950-4955
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• 2012

A bolt manufacturing process is completed with continuous forging. Technical and economical success of each process will depend on the appropriate process design and metal mold design for each procedure. This study aims to analyze the moldings of first and second steps among the multi-step molding processes of SCM435 bolt by use of the finite element method in order to achieve the reasonable process. Since the processes of first and second steps analyzed by use of the finite element method consist of axial symmetry, the transformed configuration of material satisfy the dimensions expected in process. In addition, the uniflow line formed in material becomes smooth and consistent over the entire process. Therefore neither molding of material nor inherent defect is expected.

• Journal of Arbitration Studies
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• v.20 no.2
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• pp.27-47
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• 2010

It is well recognized that the availability of prompt, effective and economical means of dispute resolution is an important element in the orderly growth and encouragement of international trade and investment. Increasingly, arbitration, instead of litigation in national courts, has become the preferred means of resolving private international commercial disputes. Under the situation, it will be important thing for arbitral institutions to reach an agreement to promote the dispute settlement of the commercial disputes, for which efforts have been made between the Korean Commercial Arbitral Board(KCAB) and principal arbitration institutions of the foreign countries. Since 1973, the KCAB has entered into many arbitration agreements with well-known foreign institutions of arbitration. If the place of arbitration is not so designated by the parties, it, as a general rule, shall be the country of the respondent(s) under the Korea-Japanese Arbitration Agreement. On the other hand, the U.S.-Korean Commercial Arbitration Agreement maintains 'Joint Arbitration Committee which finally decide the place of arbitration. In 1996, the Korea-Austria Agreement of Cooperation was concluded for the prompt and equitable settlement on an amicable basis of commercial disputes. Under this Agreement, arbitral institutions between Korea and Austria agreed to act as an appointing authority in accordance with the UNCITRAL Arbitration Rules. It is also very important for Korea and China including North Korea to cooperate each other for the settlement of the commercial disputes within the Pan Yellow Sea Economic Bloc(PYSEB). The PYSEB is quickly becoming a distinctive and crucial region in the world sharing geographical proximity, many common historical experiences, and similar cultural norms and values although they have disparities in stages of development, trade and economic policies, and financial and legal frameworks. Finally, it should be considered to establish a central common system for settlement promotion of the commercial disputes within the PYSEB through the arbitration agreement. Such a dispute resolution system was already introduced and established within the area of the NAFTA, and it is called the Commercial Arbitration and Mediation Center for the Americas(CAMCA).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4969-4976
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• 2015

South Korea has more than two-thirds of the land consists of mountainous terrain. It is necessary to enable the recycling of mountain tourism policy to allow people to use. This paper studied Bukhansan where there seems to have the most economical efficiency and effectiveness as an alternative means of transportation applying user'swillingnessto pay by age based upon the Study on Introduction Bukhansan Mountain Railway which was progressed as part of the balanced national development and railway promotion strategy. The Analyisis results are shown that cost-benefit ratio is Lim 0.73 and rack & pinion 0.8. The rack-and-pinion method is selected as an applicable alternative. If the new technologies are developed and made part of the construction of the tunnel route was judged as possible as an alternative way LIM

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.3
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• pp.260-266
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• 2018

The concept of customer utility, which affects customer's adoption, is important to understand the process of technology diffusion and substitution regarding multiple generation technology. This research defined the concept of attribute-based customer utility and developed a model for measuring attribute-based customer utility. Based on the literature review and modeling, we provided the definition and a model regarding customer utility and the accuracy of the model is verified through a case study of the semiconductor industry. Customer utility for a multiple generation technology needs to consider changes by generation, or time within the same generation, and is defined as the summation of both technological and economic utilities. In addition, we can model the measurement of customer utility after converting technological and economical attributes into utilities. This research is valuable in understanding not only customer utility as a driver of customer adoption, but also for establishing technological strategy after forecasting diffusion and substitution paths based on customer utility.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.5
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• pp.599-604
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• 2018

For missile systems, sustaining high reliability and ensuring economical maintenance are very important. In the Republic of Korea, for most missiles, periodic inspection is mandatory for missiles in the field. Every fixed number of years, they are returned to the ordnance depot to be tested and repaired if faults are found. Almost all missiles have a built-in test (BIT) capability. With the BIT, faulty missiles can be isolated anytime during operations or storage in the launchers. So the reliability and the maintenance costs of the missiles greatly depend on the length of the inspection cycle and the BIT/inspection quality. In this paper, we suggest a model for predicting the storage reliability of missiles subjected to non-periodic tests and periodic inspections, excluding overlapping failures. Some numerical examples are given. This model will be useful for determining the length of the periodic inspection cycle.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.6
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• pp.2888-2897
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• 2011

The performance of a geothermal heat pump system using carbon dioxide was investigated by the steady-state cycle simulation program developed in this study. A parametric study was carried out in order to investigate the effect of various operating conditions on the performance of the basic cycle without an IHX(internal heat exchanger). The simulation program consists of several Fortran subroutines for simulating indoor and outdoor heat exchangers, compressors, and expansion valves and Visual Basic subroutines for the graphic user interface(GUI) consisted with pre-processor for input data and post-processor for the output data. Refprop V6.01 was used for estimating the thermodynamic properties and equilibrium behaviors of carbon dioxide. The simulation results were validated by comparing experimental data through a series of case studies. The cycle simulation program developed in this work would seem to be a useful tool in optimizing and establishing economical and efficient operating conditions in the $CO_2$ geothermal heat pump system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.6208-6214
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• 2012

The most essential but missing components to understand and use toxic substances from marine microalgae are developing the fast, easy and economical determining technology for detecting it. In this paper we produced the antibodies against saxitoxin (STX). Mariculture keyhole limpet hemocyanin (mcKLH) and ovalbumin (OVA) were used as carrier proteins. mcKLH-STX conjugates were injected into the peritonial cavity of BALB/c mouse for immunization. After bleeding from mouse, anti-STX antiserum was isolated. Indirect enzyme-linked immunosorbent assays (ELISA) was performed to determine antiserum titer using the microtiter plate coated with free STX and OVA-STX. A goat anti-mouse IgG-phosphatase conjugate was used as secondary antibody to enable chromogenic reaction. Reactions of anti-STX antiserum were very specific on the OVA-STX and free STX. Sensitivity of anti-STX antiserum on STX was very high and STX detection limit was to be 64.9 ng/kg for indirect ELISA.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2794-2802
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• 2009

Soil nailing method is widely used in reinforcing slopes and excavating earth. The analysis of nail-reinforced slopes, generally require complicated computer programs. The purpose of this paper is suggest, Soil stability Chart for nailed slopes which are very useful for pre-design, rapidly design, and final check. Three slope types, three nail lengths and three nail angles are selected for the stability analysis by using limit equilibrium method form Bishop and French. From the above results, this study propose the reinforced design charts for examine the necessity of reinforcement can be examined. The suggested stability chart and Taylor's Slope Stability Chart, showed similar safety factors. This Soil Nailing design charts can provide the solutions for necessity of reinforcement, economical of nail's length ratio and installation angle as well.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.8
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• pp.2853-2859
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• 2010

Development and promotion of foreign tourism products is an important factor for economical side as well as to improving the foreign relation and the image of nation. Also, foreign tourism products can give a positive effect in activation of the domestic tourism industry and foreigner's domestic visit. Thus, development and promotion of travel industry may offer competitive power of the specification country and a development opportunity, and influence in investment infancy of different industry. Therefore, in this study, service quality of this foreign tourism products analyze effect about customer satisfaction and re-purchase intention, investigated competitive power factors of the tourism industry in the future. In the final study, service quality patten, confidence, attraction could be influenced on customer satisfaction, reliability and responsiveness was not affected by the other factors. This study may suggest guideline that analyze the special character factors of the tourism industry future, or develop the critical success factor of foreign tourism products.