• Journal of Korea Foundry Society
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• v.6 no.1
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• pp.27-35
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• 1986

The gating design of gray cast iron was programmed in a Personal computer. By this program, casting test was done. The results obtained are as follows. 1. Gating design that can calculate the velocity of metal flow and size in each gate section by knowing the loss coefficient caused by friction loss and bend loss was programmed. 2. In the test casting, the gating ratio was changed into 1.1:1.3:1, 1:2:2, 1:4:4. And sound casting, free of sand washing defect, was obtained at the velocity of 35.5cm/sec in ingate.

• Journal of Korea Foundry Society
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• v.36 no.6
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• pp.208-214
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• 2016

Casting defects, which are closely related to entrapped air bubbles and metallic oxides, occur very frequently in the casting process. Many researchers have shown that these defects can be reduced by adopting an appropriate gating system design. But, it is difficult for field engineers to identify a specific gating system that is more appropriate for their products. In this study, we tried to draw a comparison of gating system designs with and without ceramic foam filters. A ceramic foam filter was added to the horizontal runner just after the sprue to prevent air bubble generation and to reduce turbulence without change of the gating system design. To verify the effects of initial pouring velocity, the experiment was conducted with four different amounts of water volume in the reservoir. Results of the water modeling experiment applying the filter showed remarkably changed flow characteristics. Although the study confirmed that use of the filter may change the flow characteristics, it needs to be noted that only filter use alone cannot solve all the problems caused by a poorly designed gating system.

• International Journal of Precision Engineering and Manufacturing
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• v.4 no.2
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• pp.39-48
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• 2003

In the Semi-Solid Diecasters design, a Seni-Solid Diecasters experiment has usually been carried out before producing new casts. At the Semi-Solid Diecasting stages, the runner-gate part has been always repeatedly corrected, which leads to a tedious processing time and high processing cost. Much experience is essential in manual assessment and if the design is defective, much time and a great deal of efforts will be wasted in the modification of the die. In this study, a design system has been developed based on the design database In addition, a gate experiment for the gating system design has been tarried out to append the database. It is possible for engineers to make efficient gating system design of Semi-Solid Diecasting and it will result in the reduction of expenses and time to be required.

• The Journal of the Korea institute of electronic communication sciences
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• v.2 no.3
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• pp.163-167
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• 2007

In this paper, to design 8 bit RISC Microprocessor, a method of Clock Gating to reduce electric power consumption is proposed. In order to examine the priority, the comparison results of between a 8 bit Microprocessor which is not considered Low Power consumption and which is considered Low Power consumption using a methods of Clock Gating are represented. Within the a few periods, the results of comparing with a Microprocessor not considered the utilization of Clock Gating shows that the reduction of dynamic dissipation is minimized up to 21.56%.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.6
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• pp.55-66
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• 2016

Power gating is one of effective techniques for reducing leakage current in semiconductor chip. However, power gating cell (PGC) which is used to switch the power source causes performance degradation and the associated reliability problem by increasing IR drop. However, the newly raised problem caused by different scaling properties between gates and metal wires demands additional considerations in power gating design. In this paper, we propose a robust cell placement based power gating design method for reducing the area for power gating cell and metal routing thus to meet IR drop requirement. Experimental results by applying the proposed techniques on the application processor for smartphone fabricated in 28nm CMOS process show that power gating cell area is reduced by 16.16% and maximum IR drop value is also decreased by 8.49% compared to existing power gating cell placement techniques.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.5
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• pp.889-898
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• 2022

In this study, sand casting process was applied to manufacture a large aluminum turbo-type fan used for tank powerpack. To apply the sand casting method, the turbo fan was reverse engineered, and after designing three gating systems, the optimal gating system design was selected by performing casting simulation. In the case of the bottom up-gating system, there is a significant temperature loss of the molten alloy during blade filling. When the molten alloy is completely filled into the sand mold, the blade upper tip and front shroud are below the liquidus temperature. In the case of the top down-gating system, molten alloy scattering occurs, but the temperature loss while the blade is filled is smaller than that of the bottom up type. And after the inflow of molten alloy into the mold is completed, the blade upper tip and front shroud are higher than the liquidus temperature. A sand mold was manufactured with the top down-gating system and the casting process was performed. The fan was made perfectly in appearance without any unfilled parts.

• Journal of Korea Foundry Society
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• v.27 no.1
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• pp.42-47
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• 2007

Vacuum molding process(V-process) has several benefits such as a lower total production cost and a high quality casting comparing to the conventional sand molding. Influence of the gating design on the molten metal flow was investigated in this study. General criteria for the gating design of the castings and commercial codes for the flow and solidification analysis were used to attain the optimized gating design in V-process. Though mold cavity was filled smoothly under the low initial velocity of molten metal, molten metal dashed against the upper part of the mold before the completion of the mold filling with higher initial molten metal velocity and fell soon. This phenomenon may affect collapsing the mold shape, however it is thought that the possibility of burning out of the vinyl by the molten metal is not so high because vinyl is coated with refractory material.

• IEIE Transactions on Smart Processing and Computing
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• v.6 no.3
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• pp.220-227
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• 2017

Technology development is leading to the invention of more sophisticated electronics appliances that require long battery life. Therefore, saving power is a major concern in current-day scenarios. A notable source of power dissipation in sequential structures of integrated circuits is due to the continuous switching of high-frequency clock signals, which do not carry any information, and hence, their switching is eliminated by a method called clock gating. In this paper, we have incorporated a recent clock-gating style named Leakage Control Transistor (LECTOR)-based clock gating to drive a multi-stage sequential architectures, and we focus on its performance under three different process corners (fast-fast, slow-slow, typical-typical) through Monte Carlo simulation at 18 GHz clock with 90 nm technology. This gating is found to be one of the best gated approaches for multi-stage architectures in terms of total power consumption.

• Journal of the Korean Society for Precision Engineering
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• v.19 no.8
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• pp.116-125
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• 2002

Semi-Solid Diecasters usually carry out the Semi-Solid diecasting experiments before producing new casts. At the Semi-Solid diecasting stages, the runner-gate part has been always repeatedly corrected, which leads to a tedious processing time and increased processing cost. A large amount of experience is essential in manual assessment and if the design is defective, much time and a great deal of efforts will be wasted in the modification of the die. In this study, design system has been developed based on design database. In addition, gate experiment for gating system design has been carried out to append the database. It is possible for engineers to make efficient gating system design of Semi-Solid diecasting and it will result in the reduction of expenses and time to be required. The detailed contents of the research are described in the followings.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.324-328
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• 2002

Semi-Solid Diecasters usually carry out the Semi-Solid diecasting experiments before producing new casts. At the Semi-Solid diecasting stages, the runner-gate part has been always repeatedly corrected, which leads to a tedious processing time and increased processing cost. A large amount of experience is essential in manual assessment and if the design is defective, much time and a great deal of efforts will be wasted in the modification of the die. In this study, design system has been developed based on design database. In addition, gate experiment for gating system design has been carried out to append the database. It is possible for engineers to make efficient gating system design of Semi-Solid diecasting and it will result in the reduction of expenses and time to be required. The detailed contents of the research are described in the followings. An attempt is made to link programs incorporating a number of expert design rules with the process variables obtained by commercial FVM softwares, MAGMAsoft, to form a useful package.