• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2002.02a
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• pp.98-100
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• 2002

We developed the Centrifugal Forming Process(CFP) for HTS tube fabrication. The self-designed equipment for CFP is devided into 3 main parts depending on its role and functions. the melting part by heating of high inductive frequency, centrifugal forming part for the tube and efficient microstructure control of Bi2212 phase and molding part for tube detachment after heat treatment. In this paper we will introduce self designed Centrifugal Forming Process for HTS tube fabrication and discuss about the results related mold materials in terms of high Tc superconductor.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.73-77
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• 2004

This paper presents a PC-based controller of industrial SFFS(Solid Freeform Fabrication System). The SFFS has multiple sub-controllers for the building room, the powder room, the temperature, and the density of oxygen in the chambers. Hence the main PC-based controller should effectively and timely send commands to the sub-controllers, and monitor the overall SLS process. The required actuators and sensors are selected to optimize the overall performance of the SFFS.

• IE interfaces
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• v.12 no.3
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• pp.437-447
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• 1999

Modeling and system development for the fabrication process in the semiconductor manufacturing is presented in this paper. Maximization of wafer production can be achieved by the wafer flow balance under high utilization of bottleneck machines. Relatively simpler model is developed for the fabrication line by considering main characteristics of logistics. Simulation system is developed to evaluate the line performance such as balance rate, utilization, WIP amount and wafer production. Scheduling rules and input rules are suggested, and tested on the simulation system. We have shown that there exists good combination of scheduling and input rules.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2001.02a
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• pp.114-116
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• 2001

This paper deals with the design and fabrication of loop superconducting Persistent Current Switch(PCS) circuit. The self and mutual inductances of the circuits are calculated and compared to the measured values. The size of loop circuits was determined using the calculated inductances, and the fabrication processes of the superconducting persistent current switch are described.

• Journal of the Korean Institute of Telematics and Electronics
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• v.24 no.6
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• pp.992-997
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• 1987

This paper describes the design and fabrication of an integrated circuit that can separate the horizontal SYNC., vertical SYNC. and composite SYNC. signal included in a composite video signal. The circuit that is based on the comparator level samplign method can separate a stable SYNC. signal even from an external circuit with large variation. It has been fabrivated by the SST bipolar process. Its chip size is 1.5x1.5mm\ulcorner As a result, we succeeded in fabrication of IC which satisfied DC characteristics and SYNC. singal separator function.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.6
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• pp.840-845
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• 1986

In this Part II of the paper, we evaluated the fabrication error and dividing characteristics for the opticalfilters proposed in the Part I. Furthermore, we propose an integrated optical filter with a new function that can eliminate the fabdrication error. The fabrication method and filtering characteristics have been tested by experiments, thereby confirming the validity of the design theory.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.103-105
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• 2003

The high speed of RSFQ circuits is based on the self-resetting in the overdamped Josephson junctions. The SIS technology using Nb/A1$_2$O$_3$/Nb trilayer has been successfully adopted as a standard technology. However the newly suggested SINIS technology attracts interest because the junction itself is overdamped without any external shunt, and provides possibility of simplification of RSFQ circuit design and fabrication. In this paper we demonstrate RSFQ circuit fabrication process using SINIS technology.

• Journal of the Optical Society of Korea
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• v.8 no.1
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• pp.21-28
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• 2004

When femtosecond laser pulses are focused inside the bulk of transparent materials, the intensity in the focal volume becomes high enough to produce permanent structural modifications. This technique has been applied to fabricate three-dimensional photonic structures such as optical memory, waveguides, gratings, and couplers inside a wide variety of transparent materials. In this paper, we review the fabrication of optical elements in glasses with femtosecond laser pulses, including the fabrication of waveguides, couplers, Bragg gratings, zone plates, holographic memory, and micro holes.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1983.04a
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• pp.45-47
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• 1983

In integrated circuit, for a saving in total chip area per circuit, stably high value resistor was fabricated. Hence this paper explained that the measurement and fabrication of high value semiconductor resistor using ITO thin film. It is also used special material and new method fabrication.

• IE interfaces
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• v.12 no.3
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• pp.395-400
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• 1999

Shipbuilding process is composed of hull construction, in which the structural body of a ship is formed, and outfitting, in which all the non-structural parts such as pipes, derricks, engines, machinery, electrical cable, etc. are manufactured, added and assembled. Hull construction can be classified into parts fabrication, block assembly and hull erection. Among them, the parts fabrication is the first manufacturing stage that produces components or zones needed for block assembly and hull construction. More specifically, the parts fabrication is performed through machining processes including marking, cutting, pressing, and/or forming. When material is entering into the parts fabrication stage, it is important for achieving the total efficiency of production to select one of production division, so-called 'bay,' as well as machine tools on which the part is fabricated. In this paper, given production quantities of parts in the fabrication stage, the problem is to optimally select machine tools and production division, such that the total flow-time is minimized as well as the workload among machines is balanced. Specifically, three mathematical models for flow-time minimization, load balance, and simultaneously considering both objectives, and a numerical example are analyzed and presented.