• Analytical Science and Technology
• /
• v.12 no.6
• /
• pp.540-549
• /
• 1999

The combustion temperature was controlled between $880^{\circ}C$ to $1070^{\circ}C$ to find the relation the combustion temperature and emission amount of PCDDs/PCDFs in the Municipal solid waste incinerator. The emission amount of PCDDs/PCDFs decreased when the temperature increased in the rear of the boiler. The PCDDs/PCDFs concentration were detected $7.82ng-TEQ/Nm^3$ at $880^{\circ}C$, $6.97ng-TEQ/Nm^3$ at $970^{\circ}C$ and $6.13ng-TEQ/Nm^3$ at $1070^{\circ}C$. Also, The chlorophenols, chlorobenzenes, and PCB concentration decreased by increasing the temperature from $880^{\circ}C$ to at $1070^{\circ}C$, and the isomer of the prescsors had a tendency to emit the higbly cbiorinated compounds.

• Korean Journal of Materials Research
• /
• v.30 no.6
• /
• pp.308-314
• /
• 2020

A commercial AA1070 alloy for electrical wire is severely deformed by drawing process in which a rod with an initial diameter of 9mm into is reduced to a wire of 2mm diameter. The drawn AA1070 wire is then annealed at various temperatures from 200 to 450 ℃ for 2h. Changes in microstructure, mechanical properties and electrical properties of the specimens with annealing temperature are investigated in detail. The specimen begins partially to recrystallize at 250 ℃; above 300 ℃ it is covered with equiaxed recrystallized grains over all regions. Fiber textures of {110}<111> and {112}<111> components are mainly developed, and {110}<001> texture is partially developed as well. The tensile strength tends to decrease with annealing temperature due to the occurrence of recovery or/and recrystallization. On the other hand, the elongation of the annealed wire increases with the annealing temperature, and reaches a maximum value of 33.3 % at 300 ℃. Electric conductivity of the specimens increases with annealing temperature, and reaches a maximum value of 62.6 %IACS after annealing at 450 ℃. These results are discussed in comparison with those for the other aluminum alloy.

• Bulletin of the Korean Chemical Society
• /
• v.28 no.6
• /
• pp.1070-1072
• /
• 2007

• Transactions of Materials Processing
• /
• v.24 no.5
• /
• pp.323-331
• /
• 2015

Impact extrusion is an economical and productive process that can replace the multistage deep drawing process for producing deep rectangular cases. In the current work, a three-dimensional finite element analysis of the impact extrusion process of a commercial purity aluminum alloy (AA1070) was performed to predict loads, material flow, and deformed shapes using the Hansel-Spittel rheology law, which describes the flow stress at various temperatures and strain rates. The role of various process parameters such as friction, clearance between punch and die, aspect ratio and thickness of billet on the process and the shapes was analyzed.

• Bulletin of the Korean Chemical Society
• /
• v.31 no.4
• /
• pp.1070-1072
• /
• 2010

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.8 no.1
• /
• pp.1064-1070
• /
• 1966

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• v.21 no.3
• /
• pp.155-165
• /
• 2017

The Hansel-Spittel constitutive model requires a total of nine parameters for flow stress prediction. Typically, the parameters are estimated by least squares methods for given tensile test measurements from a deterministic perspective. In this research we took a different approach, a probabilistic viewpoint, to see through the development of the Hansel-Spittel constitutive model. This perspective change showed that deterministic least squares methods are closely related to statistical maximum likelihood methods via Gaussian noise assumption. More intriguingly, this perspective shift revealed that the Hansel-Spittel constitutive model may leave out deterministic trends in residuals despite nearly perfect agreement with measurements. With tensile test measurements of AA1070 aluminum alloy, we demonstrated this deficiency of the Hansel-Spittel constitutive model, suggesting room for improvement.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.59 no.6
• /
• pp.1070-1074
• /
• 2010

In this study we deal with a simple computer simulation algorithm to decide the PRT station capacity. PRT system is different from the conventional rail traffic system in such point that the station is off-line so as to guarantee a very short headway. This characteristic has correlation with the accurate prediction of the line capacity and with the scale of the off-line station. In this paper physical factors and vehicles per hour that are necessary to decide the off-line station scale and the off-line station capacity, respectively, are shown through a simple compter simulations.

• Korean Journal of Radiology
• /
• v.25 no.2
• /
• pp.212-213
• /
• 2024

• Proceedings of the Korea Information Processing Society Conference
• /
• 2010.11a
• /
• pp.1070-1073
• /
• 2010

모바일 기기의 통신에 있어 가장 중요한 요소는 이동성 지원이다. 이에 따라 3G 와 같은 이동통신을 지원하는 기술이 출현하게 되었고 이를 통해 이동 중에도 데이터 통신이 가능하게 되었다. 하지만 이동통신은 많은 에너지 소비와 높은 통신 비용문제 등으로 대용량 전송에 적합하지 않은 문제점이 있다. 이에 반해 Wi-Fi 와 같은 Wireless 네트워크는 이동성을 지원하지 않는 대신 허가 받지 않은 주파수 대역을 이용하여(예: Wi-Fi 의 2.4GHz, 5GHz) 높은 대역폭을 제공할 뿐만 아니라 전력을 적게 사용하는 장점이 있다. 본 논문에서는 3G 와 Wi-Fi 을 동시 다중 연결을 통해 서로의 장점을 극대화하고 단점을 보안한 기법을 제시하고 시뮬레이션을 통해 이를 검증 한다.