• Proceedings of the Korean Society of Marine Engineers Conference
• /
• 2000.11a
• /
• pp.143-151
• /
• 2000

Dissolved silica is make some critical trouble at steam turbine. And, we must measure it to ppb level. We were looking for the best measuring method of the silica. Via this study, we could found it in the N-IR spectroscopy technology. This dissertation have been discuss about system structure, system fundamentals and performance test. At the test, we were study in the spectral interference of $NH_3$. We know that existing system had some problem. It is structural frailties of single beam type. Therefore we were study for double beam type structure. And we obtain a good result. In the result, it have been discuss that conduct a test of $NH_3$ effect.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.33 no.3
• /
• pp.185-189
• /
• 2009

Focused ion beam system was designed, which includes LMIS, electrostatic lens and high voltage power supply. Control program is updated for high speed image processing. The details of vibration-free vacuum system and other important electrical parts were trouble-shooted for appropriately controlling high acceleration voltages.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.04a
• /
• pp.121-126
• /
• 2000

This research proposes a new advanced control method and demonstrates its realization in part. By incorporating shape machining and cutting force control at a time, this integrated scheme makes it possible to machine a desired shape and avoid the trouble of programming feedrate and spindle speed before machining and also reduce the shape error. The main idea proposed to achieve those goals consists in giving commanded path and desired cutting force at the same time. which makes it possible for position and force controller to distribute the corresponding velocity of individual axes and main spindle by an appropriate interpolation. That indicates we can replace the built-in interpolator of commercial machine tools by the developed algorithm.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2004.10a
• /
• pp.201-206
• /
• 2004

Laser scanner are getting used for inspection and reverse engineering in industry such as motors, electronic products, dies and molds. However, due to the lack of efficient scanning technique, the tasks become limited to the low accuracy purpose. The main reasons for this limitation for usefulness are caused from the optical drawback, such as irregular reflection, scanning direction normal to measuring surface, the influence of surface integrity, and other optical disturbances. To overcome these drawback of laser scanner, this study propose the mechanism to reduce the optical trouble by using the 2 kinds of rotational movement axis and by composing the spherical coordinate to scanning the surface keeping normal direction consistently. So, it could be designed and interfaced the measuring device to realize that mechanism, and then it could acquisite the accurate 3D form cloud data. Also, these data are compared with the standard master ball and the data acquisited from the touch point sensor, to evaluate the accuracy and stability of measurement and to demonstrate the implementation of an dental tooth purpose system

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2004.10a
• /
• pp.156-161
• /
• 2004

The application of solar energy, in the field of alternative energy, was on the increase tendency. In the case of advanced nations, through continuous R&D, solar hot water heater with high efficiency has been used for the house and the industrial process on business, advanced nations were reached up the experimental stage of solar generation system. But, the actual circumstance of the domestic has been not accomplished the popularization of solar hot water heater and the settlement of it which is the fundamental stage of the solar energy usage. This trouble, the domestic was flooded with small enterprise for producing solar hot water heater, was caused by the popularization and the production without verification of performance. To supply the monitoring program for evaluating solar hot water heater, this research was purpose to improve the technical development of the enterprise for producing solar-heat hot-water-boiler and served as an aid for the enlargement and the popularization on solar energy.

• Proceedings of the KSME Conference
• /
• 2008.11a
• /
• pp.1132-1135
• /
• 2008

The sludge grown up in steam generators of nuclear power plants shortens the life-cycle of steam generators and reduces the output of power plants. So KHNP(Korea Hydro and Nuclear Power), the only nuclear power utility in Korea, removes it periodically using a steam generator lancing system during the outage of plants for an overhaul. KEPRI(Korea Electric Power Research Institute) has developed lancing systems with high pressured water nozzle for steam generators of nuclear power plants since 2001. In this paper, the design of a partial inter-tube lancing system for model F type steam generators will be described. The system is actuated without a DC motor inner steam generators because the motors in a steam generator make a trouble from high intensity of radioactivity as a break down.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
• /
• v.13
• /
• pp.897-908
• /
• 2000

Customs clearance is one of systems controlled by a customhouse that administrate all exported or imported goods passed frontier. This customs clearance systems of china and korea equally means, but it find obvious that customs law and rule, customs formalities between china and korea differ greatly. Therefore, this article describes a customhouse controlling exportation and importation, company dealing clearance service as the subject of customs clearance and customs formalities in order to generally analyse on customs clearance systems of China. As a result, this seeks for problems of customs clearance systems in China and a means of settling a trouble.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.4
• /
• pp.327-334
• /
• 2000

In this paper, the circuit model using circuit averaging method for full bridge for full bridge converter is suggested. This model can represent the physical characteristics of converter circuits appropriately. At most of high capacity DC-DC converter application parts, full bridge converter is adapted for main circuit of power supply. Design and analysis of full bridge converter is no trouble with circuit model. The validity of circuit model is verified through computer simulation and practical welding experiment of welding machine with full bridge converted model.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2012.05a
• /
• pp.55-56
• /
• 2012

PMIS has been progressed to signification of collaboration tool which knows the flow of information and facilitates communication between the project participants. However, research has actively been studied combining with BIM to solve this problem as revealed many issues in PMIS. The purpose of this study to analyze a trouble that arise when operating BIM-based PMIS and suggest about grafting Virtual Computing Technology and compatibility analysis on the alternative.

• Proceedings of the KIEE Conference
• /
• 2002.11b
• /
• pp.352-354
• /
• 2002

The sag is phenomenon that magnitude of load voltage temporarily decreases because of power system fault. If a certain equipment in industrial process have any trouble result from sag. it can cause utility to be charged for enormous economics loss. Therefore it need to analyze the characteristic of sag and then mitigation method for sags in distribution system in odor to increase reliability. This paper gives an overview of sags characteristic due to short circuit fault in distribution system and after a general discussion of the various forms mitigation, gives a sags mitigation method with concentrating on changing the distribution system like spot network, on-site generation.