• 소성∙가공
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• 제11권5호
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• pp.423-429
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• 2002

The limiting drawing ratio (LDR) under uniform heating of blanks was measured at the various temperature ranges between 25 and 25$0^{\circ}C$ by using two different blank shapes, square and circular blanks, and six different blank sizes with the drawing ratios(DR) of 2.4 to 2.9. The galvannealed steel sheet (SCP3CM 60/60) of 0.7mm thickness were used. The LDR at warm forming condition reached 1.2 times of that at room temperature, and the maximum drawing depth reached 1.9 times. The higher temperature was adopted, the more stable and uniform thickness strain distribution was observed. Some cases of the experimental results were compared with the analitical results using the commercial finite element method (FEM) code.

• 무역상무연구
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• 제33권
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• pp.3-28
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• 2007

A non-documentary conditions is a condition contained in the credit without reference to the presented document in compliance therewith, thereby causing many problems to all parties involved in letter of credit transactions. The purpose of this study is to examine the regulations on the non-documentary conditions under Uniform Customs and Practice for Documentary Credits: UCP, International Standby Practices: ISP98, United Nations Convention on Independent Guarantee and Stand-by Letters of Credit: CIGSLC and Uniform Commercial Code: UCC and also the opinions on the effect of non-documentary conditions through the analysis of several cases on the non-documentary conditions. The result of this study can be summarized as follows: First, UCP, ISP98, CIGSLC and UCC stipulate that banks will deem non-documentary conditions as not stated and will disregard them. Second, courts used to permit the effect of non-documentary conditions. Finally, all parties should not attempt to put in any non-documentary conditions in order to prevent disputes on the effect of non-documentary conditions.

• 한국태양에너지학회 논문집
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• 제25권3호
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• pp.19-25
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• 2005

Francis turbine of commercial small hydropower plants under 10kw which is investigate a flow characterist and an efficiency in the research which it sees, the problem and an improvement is investigate. In the research which it is simply model with casing, guide-vane, runner, draft tube for simulation numerical analysis of small-sized Francis turbine. Model uses the Gambit and it composes with approximately 800,000 non-uniform lattices. Solutions are investigate the hydraulic characteristics against an outward angle of guide vane, the number of guide vane, head(inlet velocity) by using FLUENT which is a commercial business code.

• 한국중재학회지:중재연구
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• 제25권4호
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• pp.77-95
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• 2015

CISG provides a uniform framework for contracts of sale of goods between parties whose places of business are in different States. In 2004 South Korea became the 63th State around world to adopt CISG. Starting next year CISG goes into effect as the law that governs the contracts for international sale of goods, in respect of which CISG displaces the existing domestic civil and commercial codes of Korea. By its provision Article 1(a), CISG applies directly between Contracting States without reference to private international law. As South Korea's biggest trade partners including China, the U.S. and Japan are also parties to CISG, the number of such direct applications continuously increases. Now it is estimated, though roughly, that CISG governs about two-thirds of Korea's import and export trade of goods. The private survey of the author shows that up to now in South Korea there are 39 court cases decided by the first instance courts, 29 cases by the appellate court and six cases by the Supreme Court of South Korea. In nearly all these cases, CISG applied directly. Furthermore, currently CISG is, in several respects, influencing upon the revision of Korean civil code which is designed to modernize it: The revised draft published in 2013 adopts the rules on the revocation of offers provided in articles 15 and 16, the rule on the termination of offers provided in article 17 and the rule on the time that an acceptance takes its effect provided in article 18 of CISG. More importantly, in accordance with the rules taken by CISG, the revision draft no longer requires the existence of fault or negligence on behalf of the breaching party in order for the aggrieved party to void the contract, and the revised draft denies the right of avoidance for trivial, not fundamental, breaches of contract.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.1476-1481
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• 2004

In this paper, we present the flow and heat transfer characteristics with the array of impinging jet nozzles by using the numerical computation and experiment. Numerical solutions were obtained for dimensionless gap H=6, dimensionless outlet length L=10 and Reynolds number Re=1500 by using the commercial CFD code, CFX -5. Experimental and numerical results were agreed well with each other. It was found that the impinging jet with circular array nozzles generated the uniform heat transfer area and the maximum heat transfer is higher than rectangular array nozzles for certain parameter sets.

• 동력기계공학회지
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• 제10권3호
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• pp.32-37
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• 2006

In this paper, we present the flow and heat transfer characteristics with the array of impinging jet nozzles by using the numerical computation and experiment. Numerical solutions were obtained for dimensionless gap H=6, dimensionless outlet length L=10 and Reynolds number Re=1500 by using the commercial CFD code, CFX-5. Experimental and numerical results were agreed well with each other. It was found that the impinging jet with circular array nozzles generated the uniform heat transfer area and the maximum heat transfer is higher than rectangular array nozzles for certain parameter sets. It is one of the most important utilities providing steam to turbine in order to supply mechanical energy in thermal power plant. It is composed of thousands of tubes for high efficient heat transfer.

• 무역상무연구
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• 제15권
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• pp.59-87
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• 2001

In recent years electronic fund transfers covered by the Electronic Fund Transfer Act 1978 for consumer protection and the Article 4A of Uniform Commercial Code(U.C.C.) 1989 for wholesale electronic payments in United States. Electronic fund transfers carried out by use of a wire transfer network, automated clearing house, or other communication system of a clearing house or other association of banks such as direct deposit, Fedwire, automated teller machine, point-of-sale, and credit card transactions have been increasingly common in consumer transactions and wholesale transactions. Especially, the Article 4A of U.C.C. governs the rights and obligations associated with transactions such as an issue and acceptance of payment order, execution of sender's payment order by receiving bank, and payment. These legal frameworks in connection with electronic fund transfers in United States can play a leading role in establishing model not only within the United States, but also as a basis for developments of electronic commerce law in Korea including other countries.

• 한국유체기계학회 논문집
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• 제8권5호
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• pp.29-34
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• 2005

In this study, the effect of flow settling means on the performance of fan tester were numerically investigated by using a computational fluid dynamics (CFD). The airflow rate was calculated from the pressure differential across a flow nozzle in the measuring plane and the flow settling means were generally installed in the chamber of the fan tester to provide proper airflow patterns ahead of the measuring plane. The predicted nozzle differential pressures with uniform inlet velocities were compared with the values of the ANSI/AMCA 210-99 to verify the performance of the commercial CFD code CFX 5.6. The influence of flow settling means on the measurement of airflow rate in a fan tester were discussed with various porosities and inlet jet velocities. The results obtained show that the proper band of porosities exist to meet the AMCA standard in a specified inlet jet velocity.

• 한국유체기계학회 논문집
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• 제10권4호
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• pp.39-46
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• 2007

In large pump station, vortex generation such as free-surface vortex and submerged vortex occurring around pump intake, or at bell-mouth inlet has been an important flow characteristics which should be considered always to keep away the suction of air-entrained or cavitated flow. In this study, a commercial CFD code was used to predict accurately the vortex generation for the specified intake design. These result shows the preliminary result of submerged vortex prediction for the Turbo-machinery Society of Japan Sump Test CFD standard model. At bottom wall, air volume fraction (red color) was found in a large scale to explain the submerged vortex generation at particular operation and configuration condition. And these indicate the free surface formation behind the bell mouth. Particularly, non-uniform approaching flow is a major parameter to govern the occurrence of the free-surface vortex. Futhermore the comparison between turbulence ($k-{\epsilon}$ & $k-{\omega}$ model) mode were executed in this study.

• 한국기계가공학회지
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• 제6권4호
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• pp.3-7
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• 2007

The valve is used on control of flow in a ship. Flow coefficient of valve is very importance in the design of valve. In this paper, three-dimensional computer simulations by commercial code CFX were conducted to observe the valve type and to measure flow coefficient when valves with various angles and uniform incoming velocity were used in a piping system. By contrast, a group of experimental data is used to compare with the data obtained by CFX simulation to investigate the validity of numerical method.