• Design & Manufacturing
• /
• 제2권1호
• /
• pp.21-26
• /
• 2008

In this research, jar die of cosmetic products which is difficult to produce variously was developed and can be obtain the productivity improvement by flexibility with two system which can control the die temperature. Flow analysis of jar was performed to find out the curvature radius of parts. In order to reduce thickness of jar, cycle time, deformation, uniform curvature of internal jar was maintained by rapid cooling. In external of dies, cooling channel, injection molding condition, die temperature control system were researched to make dies low temperature.

• 설비공학논문집
• /
• 제24권3호
• /
• pp.212-217
• /
• 2012

The cooling of data centers has emerged as a significant challenge as the density of IT equipment increased. With the rapid increasing of heat load and cooling system, predictions for electronics power trends have been closely watched. A data center power density projection is needed so that IT organizations can develop data centers with adequate cooling for reasonable lifetimes. This paper will discuss the need for something more than processor and equipment power trend projections which have overestimated the required infrastructure for customers. This projection will use data from a survey of actual enterprise data centers and the ASHRAE projections to formulate a data center server heat load trend projection.

• Journal of Welding and Joining
• /
• 제16권3호
• /
• pp.74-84
• /
• 1998

The microstructures of the HAZ (Heat Affected Zone) are generally different from the base metal due to rapid thermal cycle during welding process. Particuraly, CGHAZ (Coarsened Grain Heat Affected Zone) near the fusion line is the most concerned region in which many metallurgical and mechanical discontinuities have been normally generated. A computer program by the numerical formularization of phase transformation during cooling with different rates was developed to generate the CCT diagram, and to predict microstructural (phase) changes in the CGHAZ. In order to verify simulated results, isothermal and continuous cooling transformation experiments were conducted. The simulated and experimental results showed that the developed computer model could successfully predict the room temperature microstructural changes (changes in volume fraction of phases) under various welding conditions (heat input & cooling rate $(Δt_{8/5})$).

• 한국초전도ㆍ저온공학회논문지
• /
• 제8권1호
• /
• pp.54-58
• /
• 2006

Stirling cryocooler is relatively compact, reliable, commercially available. and uses helium as a working fluid. Over the past decade and a half, there has been rapid development of Stirling cryocooler, mainly for military and space applications. Stirling cryocoolers have been widely used lot the cooling of infrared sensors and high temperature superconducting filters to the temperature of the liquid nitrogen. The Stirling cryocooler with the rotary compressor is applicable to the cooling device for the compact mobile thermal imaging system, because the cryocoolers have the compact structure and light weight. In this paper, integral Stirling cryocooler is designed, manufactured and fabricated, and performance characteristics are investigated. This cooler delivers approximately 0.6W cooling at 80K for 20W of input power from 24V DC power supply.

• 한국가축번식학회지
• /
• 제8권2호
• /
• pp.116-121
• /
• 1984

These experiments were carried out to examine the effect of rapid thawing (500$^{\circ}C$/min) on the survival of 8-cell mouse embryos cooled slowly (0.5-1$^{\circ}C$/min) to precooling temperatures between -10 and 070$^{\circ}C$ before direct transfer ofembryos to -196$^{\circ}C$, and to compare the survival of embroys thawed slowly (20$^{\circ}C$/min) and rapidly (500$^{\circ}C$/min) after in vitro culture. In addition, the sensitivity of 8-cell mouse embroys to the rate of addition and removal of cryoprotectant at room temperauture, and the effect of developing stages on the survival of embryos frozen-thawed slowly were investigated. The results obtained were summarized as follows: 1. Embryos were survived in rapid thawing (500$^{\circ}C$/min) only when slow cooling was terminated at relatively high subzero teperaure (-20 to -60$^{\circ}C$). The highest survival rate(77.0%) in in vitro culture of embryos thawed rapidly was obtaeined after transfer to -196$^{\circ}C$ from -40$^{\circ}C$. 2. For the survival of embryos in slow thawing (20$^{\circ}C$/min.), slow cooling to lower subzero temperature (-50$^{\circ}C$ and below) was required before transfer of embryos to -196$^{\circ}C$. These results indicate that embryos transferred to -196$^{\circ}C$ from high subzero temprature contain much interacellular ice to damage them during slow warming but to permit survival of embryos after rapid warming. 3. The Survival rate (72.7%) of 8-cell mouse embryos after rapid addition and removal of cryoprotectant, DMSO at room temperature was similar to that (83.9%) after slow addition and removal of cryoprotectant at same temperature. 4. The survival rates of 1-, 2-, 4- and 8-cell embryos frozen-thawed slowly were 26.7, 76.4, 70.0 and 83.9%, respectively.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2010년도 춘계학술대회 논문집
• /
• pp.1265-1266
• /
• 2010

• 기계저널
• /
• 제51권4호
• /
• pp.37-40
• /
• 2011

이 글에서는 고효율 사출금형 온도제어를 위한 급속가열 및 냉각기술(Rapid mold heating and cooling)의 개요에 대해 소개하고, 국내외에 개발되어 있는 급속 금형가열 및 냉각기술의 현황 및 특성에 대해 비교분석을 제시하고자 한다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2009년도 추계학술대회 논문집
• /
• pp.389-390
• /
• 2009

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2007년도 춘계학술대회 논문집
• /
• pp.721-722
• /
• 2007

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2003년도 하계학술대회 논문집
• /
• pp.161-161
• /
• 2003