• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2007.05a
• /
• pp.183-186
• /
• 2007

The injection molding process has high accuracy and good reproducibility that are essential for mass production at low cost. Conventional molding processes typically use the water-based mold heating and air cooling methods. However, in the nano injection molding processes, this semi-active mold temperature control results in the several defects such as air-flow mark, non-fill, sticking and tearing, etc. Therefore, in order to control temperature of the molds actively and improve the quality of the molded products, the novel nano injection molding system, which uses active heating and cooling method, has been introduced. By using the Peltier devices, the temperature of locally adiabatic molds can be controlled dramatically and the quality of the molded patterns can be improved.

• Proceedings of the Korea Contents Association Conference
• /
• 2007.11a
• /
• pp.255-258
• /
• 2007

WLCG/EGEE project has a main goal of providing application scientists with access to a geographically distributed computing Grid infrastructure. Currently, WLCG/EGEE infrastructure is the world's largest Grid infrastructure, providing over 20,000 CPUs and about 3 PB disk at 200 international sites and used by over 9 application domains including LHC experiments from high-energy physics. This paper addresses the design and construction of WLCG/EGEE tier-2 propelled by international collaboration with EGEE-II project.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.10a
• /
• pp.383-386
• /
• 2001

현재 대부분의 컴포넌트 프레임워크들이 특정 형태 컴포넌트와의 결합 기능 및 이에 요구되는 각종 서비스 기능의 제공을 위주로 하는데 대하여, 좀 더 효과적인 컴포넌트 기반 개발 환경의 구축을 위해서는 재귀적 컴포넌트 결합 및 다양한 결합형태의 지원, 그리고 다중 티어드 아키텍쳐를 지원할 수 있는 방안의 필요성이 제기되고 있다. 따라서 본 논문에서는 재귀적 컴포넌트 결합을 지원할 수 있는 컴포넌트 결합 컨트랙트에 기반 하여 컴포넌트 결합 컨트랙트를 연결자로 하여 구성된 복합 컴포넌트 자체가 컴포넌트 또는 프레임워크로써 기능하게 됨으로써 다중 티어 개념의 컴포넌트 시스템 아키텍쳐를 구성할 수 있음을 보이고자 한다.

• Journal of Institute of Convergence Technology
• /
• v.1 no.1
• /
• pp.5-8
• /
• 2011

Thermal analysis of a cooling module using Peltier elements are performed using a commercial software, CFD-ACE+. A standard k-e two-equation turbulent model is applied in order to represent the turbulent shear stress. Computed values are compared with the theoretical values for the validation. The effect of mass flow rates and transferred heat amounts on the temperature distributions inside the cooling system is analyzed. It was found that the increase in the mass flow rates causes the exit temperature rise. The increase in the absorbed heat amount diminished the overall temperature on the fin surfaces. In the present analysis, the material characteristics of the Peltier element itself are not considered. In the future, the effect of the turbulence models and material characteristics will be studied in detail.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.11a
• /
• pp.50-52
• /
• 2023

ML/DL과 같은 AI의 연구가 HPC 환경에서 수행되면서 데이터 병렬화, 분산 학습 및 대규모 데이터 세트를 처리를 위한 요구사항이 급격히 증가하였다. 또한, 병렬처리 연산에 특화된 가속기 기반 이기종 아키텍처 환경 변화로 I/O 처리에 고대역폭, 저지연의 스토리지 기술을 필요로 하고 있다. 본 논문에서는 고집적의 병렬 컴퓨팅 환경에 고성능 HPC, AI 애플리케이션을 처리하기 위한 티어링 스토리지 기술을 논한다. 나아가 실제 고성능 NVMe 기반의 플래시 티어링 계층 구성에서 액세스 패턴에 따른 데이터 처리 환경을 구축하고 성능을 검증한다. 이로써 다양한 사용자 어플리케이션의 I/O 패턴을 특성에 맞게 지원할 수 있다.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2001.07a
• /
• pp.112-112
• /
• 2001

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.2
• /
• pp.101-111
• /
• 2011

A new MAC protocol, MT-MAC(Multi-Tier Medium Access Control) by name, is proposed for dense sensor networks. Depending on the density of nodes in a virtual cluster, the cluster header performs the splitting to several tiers in nodes of virtual cluster. MT-MAC split the tiers to use modfied-SYNC message after receiving the beacon message from the cluster header. Because only the sensor nodes in the same tier communicate each other, less power is consumed and longer network life time is guaranteed. By a simulation method with NS-2, we evaluated our protocol. In dense nodes environments, MT-MAC protocol shows better results than S-MAC in terms of packet delivery rates throughput and energy consumption.

• Journal of Digital Convergence
• /
• v.11 no.10
• /
• pp.411-417
• /
• 2013

Enterprises utilize software development strategically within digital convergence of information technology. Software development direction of IT takes advantage of new technology through integration of across-the-board data and business process standardization and integration. But, software development environment of enterprises which globalization is accelerated gradually is doing cost-cutting effort with controls and administration about various reform activity. Nevertheless, have not normalized in customer's requirement according to project, there is visual point that excessive software development integration work and administration are necessary according as connection is not harmonious with new system. Therefore, in this study, to construct these real-time integration environment, do to propose database implementation that have productivity by deent,ing N-Tiers platform for building enterprise framework with development productivity presentation, middle(business) and data(EIS) tier that take advantage of MVC design pattern.

• The KIPS Transactions:PartD
• /
• v.8D no.6
• /
• pp.723-734
• /
• 2001

Today\\`s wide variety of component-based development environments supports the component framework that can be used only for the specific type of components. And many researches have shown that it is necessary for the component-based development environment to support recursive component composition, various kinds of component composition patterns and the multi-tier component architecture for the real benefits of software component composition. In this paper we propose the component composition specification which can not only specify the interaction contracts between components but also supports recursive component composition, and we also propose the component composition model based on this component composition specification. The proposed component composition specification can express the contractual properties that existing component specification techniques cannot specify, and it can be also used to implement the component architectures with multi-tier concept and the tool for component composition through supporting the various kinds of component composition patterns.

• Environmental and Resource Economics Review
• /
• v.30 no.3
• /
• pp.471-501
• /
• 2021

We measure Environmental Efficiency (EE) based on CO₂ in four income groups from 1998 to 2018, using the Meta Stochastic Frontier Analysis method by Input Distance Function. Our results showed that economic growth and energy consumption would increase carbon dioxide emissions, and increasing labor and capital input will reduce it. Moreover, we compared Group Environmental Efficiency (GEE), Meta Environmental Efficiency (MEE), and Environmental Gap Ratio (EGR). The results showed that GEEs were be overestimated. Furthermore, the MEE showed a downward trend during this period. The lower-middle-income group had the highest EGR performance. High-income and upper-middle-income groups showed less efficiency in MEE and EGR. To improve environmental efficiency, we must reduce fossil fuels and find more scientific and technological ways to solve existing environmental problems as soon as possible.