• Clean Technology
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• v.29 no.4
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• pp.272-278
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• 2023

There is a lot of interest in methods for pollutants using adsorption, and recent research is being conducted to show that biochar can be used to remove organic and inorganic pollutants. In particular, wood waste as waste biomass requires a biomass recycling method, and a method to increase the adsorption capacity of biochar produced using wood waste is needed. Biochar is created by Hydrothermal carbonization (HTC) using, which uses low temperature and high pressure, has low energy consumption and does not require moisture removal pretreatment, and biochar is created through chemical activation using KOH, NaOH, and ZnCl₂ chemicals. The adsorption characteristics of biochar were determined by analyzing iodine adsorptivity, specific surface area, pore diameter, pore volume, pore distribution, and SEM according to the activation. The results of analyzing the selecting biochar by activating the biochar produced at HTC 300℃, 4 hr by KOH, NaOH, and ZnCl₂ chemicals, the specific surface area was 774~1.387 m²/g, showing a high specific surface area similar to activated carbon, and it was confirmed that micropores with an average pore diameter in the range of 21~24 Å were formed. As a result of SEM observation, the surface was uniform with a certain shape depending on activation. It was confirmed that one pore was developed and the number of pores increased.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.835-837
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• 2002

This paper presents a shape optimization algorithm of electromagnetic devices using the design sensitivity analysis with FEM. The design sensitivity and adjoint variable formulas are derived for the 3D FEM with edge element. This algorithm is applied to 3D electro-magnet pole shape optimization problem to make a uniform flux density at the target region.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.118-120
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• 2006

This paper proposes a new stator pole shape having non-uniform air-gap in order to minimize the undesirable torque ripple of switched reluctance motor(SRM). Through numerical analysis using finite element method(FEM) and optimization, the proposed pole-shape-optimized stator is proven to give reduced torque ripple.

• 대한예방의학회:학술대회논문집
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• 2001.10a
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• pp.353-354
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• 2001

• 대한예방의학회:학술대회논문집
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• 2001.10a
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• pp.348-349
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• 2001

• 대한예방의학회:학술대회논문집
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• 2001.10a
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• pp.329-330
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• 2001

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2003.10a
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• pp.150-150
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• 2003

• 대한핵의학회:학술대회논문집
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• 1990.04a
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• pp.182.1-182.1
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• 1990

• 대한핵의학회:학술대회논문집
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• 1990.04a
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• pp.184-184
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• 1990

• Proceedings of the Korean Society for Quality Management Conference
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• 2007.04a
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• pp.3-8
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• 2007

본 논문에서는 사무 간접부서의 효율성 문제를 해결하고자 한다. 먼저 도요다 경쟁력의 원천인 유연생산 시스템의 아이디어를 응용하고자 하였다. 도요타의 유연생산시스템을 살펴보고, 프로세스 분석을 위해서 SIPOC 분석 기법을 살펴보았다. 도요타의 유연생산 방식을 사무 부서에 적용을 시도하였다. 실제 현장에 적용하여 효과를 보았다. 본 개선 기법은 인적 물적 제약이 많은 중소기업 및 공공부문의 경영혁신 방안으로 효과가 있을 것으로 제안한다.