• Proceedings of the KIEE Conference
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• 1996.07a
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• pp.196-198
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• 1996

The manufacturing process of the amorphous transformer core consists of winding, cutting, forming, annealing. Clamping of cores during this process are required for shape forming. Clamping of cores enhances the space factor, but degrades the magnetic properties and core loss characteristics of the cores. In this study, we investigated the optimal clamping pressure required in magnetic field annealing of 5 kVA amorphous transformer core.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.742-744
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• 2001

Moving flat core LOA consists of iron flat core as a mover and electric magnet as a stator and operated by electromagnetic force between mover and stator. In a moving flat core type, it takes advantage of doing not have to be equipped with power supply device, having a lower manufacturing cost. But it has a lower linearity and precision. In this paper, a static characteristics of LOA were studied and analyzed using FEA. Experiments, electromagnetic force and inductance according to air gap and input currents, were carried by exciting coil. And we compared these results one another.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.243-245
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• 2003

The method to fabricate the cryostat of superconducting cable is extrusion type which is used Aluminum ingot under high temperature such as 45$0^{\circ}C$ and the cryostat is formed above cable core and MLI layer. In this case, it is expected to occur thermal injury in cable core and MLI layer, so it is necessary to study to prevent thermal injury. So in this paper, using simulation on radiation and convection which are accompany with fabricating cryostat, it is suggested to reduce the thermal injury. By measuring simulation temperature and real temperature, it is possible to check the temperature on cable core and MLI layer and using these temperature, it is possible to predict whether thermal injury is occurred or not on cable core and MLI layer.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.18 no.1
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• pp.76-82
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• 2009

To obtain the surface roughness with nano order, we need a ultra-precision machine, cutting condition, and materials. In this paper, the cutting condition for getting nano order smooth surface of core have been examined experimentally by the ultra-precision machine and diamond wheels. The effects of the cutting velocity, the feed rate and depth of cut on the surface roughness were studied. And also, the surface roughness was measured by the Form Talysurf series PGI 840. The champion data of developed core was surface roughness Rmax 24.6nm, figure accuracy Rmax 68.9nm.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.9
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• pp.2173-2178
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• 2009

The die technology of a high-efficiency induction motor is an important technology for manufacturing the core (iron core), which is the major part of a high-efficiency induction motor. It is also an essential technology in enhancing national competitiveness. In this study, the core of a high-efficiency induction motor was designed and manufactured as 2 prototype dies: one is for small-size, and the other is for large-size. They are then tested by attaching in press, the result are considered.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.871-872
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• 2006

Nowadays the market for diamond tools grows rapidly. The present decline in the price of industrial diamond makes it a commoditised product capable of competing with conventional abrasives. In terms of production volume, the largest group of diamond tools comprises the metal-bonded diamond impregnated tools, such as sawblades, wire saws, and core drills for cutting stone and construction materials, and core bits for mining applications. This article provides a compendious coverage of the powder metallurgy (PM) diamond tool-making routes, and identifies the recent trends towards changing the tool design and composition to render it cheaper and more efficient.

• International Journal of Quality Innovation
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• v.8 no.3
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• pp.11-22
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• 2007

Nowadays, the competitiveness of any organisations rests dominantly on how they can manage their performance, A host of performance variables such as quality, reliability, and efficiency are recognised as competitive priorities. This paper reviews the criteria and dimensions of performance measures, and discusses six core performance indicators in agribusiness operations with particular reference to the poultry/broiler farms. Besides, a holistic "Quality, Reliability and Efficiency" view of performance is proposed when developing measures for poultry agribusiness operations.

• Journal of the Korea Construction Safety Engineering Association
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• s.48
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• pp.64-74
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• 2009

Measurement is a essential part in all kinds of industry, especially in manufacturing. But until now, measurement hasn't been located to the core of manufacturing in domestic. This improvement guide line for the multilateral problems of measuring instrument investigation of small and medium-sized enterprises. To use measuring treat it must be accustomed with the structure, the performance, the method. must be corrected periodically. The correcting-schedule is established with accuracy, stability, purpose, condition, and frequency.

• Journal of Industrial Convergence
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• v.1 no.2
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• pp.95-105
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• 2003

"All things possibly could be measured.", measurement is a essential part in all kinds of industry, especially in manufacturing. Korean Industrial Standard has been established and announced in September, 1961. Measurement has been emphasized. But until now, measurement hasn't been located to the core of manufacturing in domestic. So, this study suggests improvement guide line for the multilateral problems of measurement system based on the investigation of 146 small and medium-sized enterprises in April, 2002.

• East Asian Economic Review
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• v.26 no.3
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• pp.205-225
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• 2022

Different types of corporate ownership may affect the environment among firms and could influence the decisions of new entities in the region. This study determines the role of state-owned enterprises (SOEs) in hindering new foreign manufacturing firms in the Yangtze River delta (YRD). The negative binomial regression is used for city-sector level data and the following points summarize the results: Firstly, the unique privileges that SOEs enjoy alongside governmental support create difficulties for foreign firms trying to establish themselves near existing SOEs. Secondly, although core cities are more attractive to foreign firms than peripheral cities, the role of core-periphery reveals that, in spite of all the regional advantages core cities could offer, whenever the share of SOEs is higher, the core-periphery system will have an adverse impact on new foreign firms. In other words, government preference for SOEs can suppress the attraction of foreign start-ups. However, after 2008, the governmental authorities finally succeeded in implementing their promising policy of fair treatment and competition in only the core cities.