• 품질경영학회지
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• 제17권2호
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• pp.64-69
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• 1989

This paper aims at analyzing the process capability and at determining an optimal condition by experimental designs using the 2-way classification with repitition in order to maintain lower Nacl content and to refine both of a very small quantity of fatty acid and various magnetic ions in the glycerin to use ion exchange resin treatment process. An optimal condition of each level combination in both of passing temperature of cation exchange resin($A_1$, $A_2$, $A_3$) and of anion exchange resin($B_1$, $B_2$, $B_3$) is $A_3B_3$. The process capability index is improved from 0.63 to 1.40 and is interpreted as a desirable state. This analysis of process capability by experimental designs will contribute to improving productivity and quality of products.

• 산업공학
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• 제16권3호
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• pp.322-331
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• 2003

Most of existing studies for B2B are concerned with efficient search and/or negotiation. But nevertheless it is important to provide quick and transparent guarantee to the buyer, it is hard to find studies related with it. This article suggests the guarantee process for customer satisfaction after purchasing in B2B e-marketplace under make-to-order manufacturing environment. The process consists of three modules; a request and response, a feedback processing, and a work inquiry. Each of them is adopted according to the source of defect and business relationship of buyer, seller, provider, and repairer. All of the process is implemented in user-friendly fashion and a case is presented for the enterprise portal site.

• 한국세라믹학회지
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• 제49권3호
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• pp.221-225
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• 2012

It is possible to enhance the color of the natural diamond with a high pressure high temperature(HPHT) process. We employed a pyrophyllite tube cell and cubic press apparatus for HPHT treatment on the brown colored Type II (5.6 GPa/ $1700^{\circ}C$/ 52 min), and Type I aB(5.6 GPa/ $1650^{\circ}C$/ 30 min) diamond samples. We investigated the microstructure, Types, fluorescence, properties of the diamonds with an optical microscopy, FT-IR, photoluminescence(PL) spectroscopy, Diamond-View, and micro-Raman spectroscopy. Two tinted brown diamonds changed into colorless just after the HPHT process. Optical microscopy showed that no crack and significant inclusion evolution occurred during the HPHT process except the small graphite spot appeared in Type I aB sample. FTIR spectrum confirmed that no Type, amber center, and platelet defect change with the HPHT treatment. Diamond-View could not distinguish the HPHT treated diamonds from the naturals. PL spectroscopy showed that N3 and H3 color centers remained even after HPHT process. Consequently, we successfully changed the color of diamonds into colorless by 5.6 GPa HPHT process.

• 한국분말재료학회지
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• 제20권3호
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• pp.169-173
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• 2013

High-coercive (Nd,Dy)-Fe-B magnets were fabricated via dysprosium coating on Nd-Fe-B powder. The sputtering coating process of Nd-Fe-B powder yielded samples with densities greater than 98%. $(Nd,Dy)_2Fe_{14}B$ phases may have effectively penetrated into the boundaries between neighboring $Nd_2Fe_{14}B$ grains during the sputtering coating process, thereby forming a $(Nd,Dy)_2Fe_{14}B$ phase at the grain boundary. The maximum thickness of the Dy shell was approximately 70 nm. The maximum coercivity of the Dy sputter coated samples(sintered samples) increased from 1162.42 to 2020.70 kA/m. The microstructures of the $(Nd,Dy)_2Fe_{14}B$ phases were effectively controlled, resulting in improved magnetic properties. The increase in coercivity of the Nd-Fe-B sintered magnet is discussed from a microstructural point of view.

• 정보처리학회논문지D
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• 제14D권4호
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• pp.435-446
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• 2007

B2B 등록저장소는 기엽의 프로파일, 비즈니스 문서, 비즈니스 프로세스, 제공 서비스 등의 B2B 관련 비즈니스 정보들을 저장하고 거래 파트너 또는 잠재 거래 파트너들에게 정보를 제공하는 시스템이다. 본 논문에서는 이 중 B2B 비즈니스 프로세스의 등록저장소의 설계에 초점을 맞추어, 이를 지원하기 위한 메타데이터 온톨로지를 제시한다. 현재 ebXML BPSS (Business Process Specification Schema), WSBPEL (Web Service Business Process Execution Language), BPMN (Business Process Modeling Notation) 등의 다수의 비즈니스 프로세스 정의 언어들이 시장에서 경쟁하고 있다. 이러한 상황을 고려하여, 다수의 다른 프레임워크에서 표현된 비즈니스 프로세스를 등록저장하기 위해서 제시된 메타 데이터 온톨로지는 3개 계층, 공통 메타데이터, 언어별 메타데이터, 상호연관관계 메타데이터로 구성된다. 제시된 메타데이터 온톨로지의 유용성을 보이기 위해서, ebXML BPSS 와 WSBPEL로 표현된 비즈니스 프로세스의 온톨로지 내에 저장을 예제로 제시한다. 또한 제시된 메타데이터 온톨로지의 구현을 위해서 ebXML 등록저장소 정보모델로의 매핑 방안을 제시한다.

• Journal of Magnetics
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• 제13권3호
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• pp.102-105
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• 2008

This study examined the feasibility of the combining HDDR-process (hydrogenation, disproportionation, desorption and recombination) with mechanical milling to prepare single domain $Nd_2Fe_{14}B$ particles from a Nd-Fe-B alloy ingot. The $Nd_{15}Fe_{77}B_8$ alloy was HDDR-treated and then subjected to a roller-milling. In the HDDR-treated $Nd_{15}Fe_{77}B_8$ alloy, very small $Nd_2Fe_{14}B$ grains comparable to their critical single domain size(0.3 ${\mu}m$) were observed. These fine individual grains were separated successfully along the grain boundaries by a roller-milling. The separated $Nd_2Fe_{14}B$ grains were found to be single domain particles. These results suggest that single domain particles of the $Nd_2Fe_{14}B$ phase can be prepared from a Nd-Fe-B ingot alloy by combining a HDDR-process with mechanical milling.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 춘계학술논문 발표대회 제6권1호
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• pp.137-140
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• 2006

As underground construction is a large component of the cost of construction and a term of works in Top-Down construction, it is important to reduce the term of works in underground construction. The purpose of this study is to analyse buckling stress and load of prefounded columns as the process of excavation is changed, and propose a suitable process of excavation to increase the speed of works. When several floors are excavated, the valid buckling length of profounded column is increase and allowable buckling stress is decreased. The result shows that all columns are safe in buckling down to B3th story whether 2 stories or 3 stories are excavated straightly. However, several columns are not safe from B4th story when 2 or 3 stories are excavated straightly. With these results, a process can be designed that first B3 stories are excavated straightly, and then excavate B4th story putting concrete on B1st and B2nd story.

• 한국환경보건학회지
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• 제33권2호
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• pp.150-157
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• 2007

The chemical and photochemical decolorization of Rhodamine B (RhB) in water has been carried out by Fenton, Fenton-like and photo-Fenton-like process. The effect of applied $H_2O_2,\;Fe^{2+}$ dosage (Fenton process), $H_2O_2,\;Fe^{\circ}$ dosage (Fenton-like and photo-Fenton-like process), UV light power (photo-Fenton-like process) pH (all processes) have been studied. The results obtained showed that more than 98% of color removal was obtained for the RhB solutions in every process. However, Fenton-like process was not suitable for the color removal of RhB because Fenton-like process was required much more reagents than Fenton and photo-Fenton-like process. The Fenton and photo-Fenton-like process showed similar reagents need. Optimum pH for three processes in this study is about pH 3. The relative order of sensitivity for pH of each process was: Fenton-like > photo-Fenton-like > Fenton.

• 한국환경보건학회지
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• 제34권3호
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• pp.226-232
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• 2008

A feasibility study for the application of the photoelectrocatalytic decolorization of Rhodamine B (RhB) was performed in a photoelectrochemical reactor with immobilized $TiO_2$ particle. The effects of operating conditions, such as current, electrolyte and pH were evaluated. The experimental results showed that optimum $TiO_2$ dosage and current in the photoelectrocatalytic process were 83.3 g/l and 0.5 A, respectively. It was found that the RhB could be degraded more efficiently by this photoelectrocatalytic process than the sum of the two individual oxidation processes (photocatalytic and electrolytic process). The addition of NaCl increased the initial decolorization rate and reduced reaction time. The optimum dosage of NaCl was 0.15 g/l. The decolorization rate of the photoelectrocatalytic process increased sharply with a decrease in pH value. However when the NaCl was added, the pH effect was not high.

• 전기화학회지
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• 제18권3호
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• pp.102-106
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• 2015

The performance of Li-B alloy as anode for molten salt electrolysis was firstly investigated. The crystalline phase of the prepared Li-B alloy was identified as $Li_7B_6$. The potential profile of Li-B alloy anode was monitored during the electrodeposition of $Nd^{3+}$ onto an LCC (liquid cadmium cathode) in molten LiCl-KCl salt at $500^{\circ}C$. The potential of Li-B alloy was increased from -2.0 V to -1.4 V vs. Ag/AgCl by increasing the applied current from 10 to $50mA{\cdot}cm^{-2}$. It was found that not only the anodic dissolution of Li to $Li^+$ but also the dissolution of the atomic lithium ($Li^0$) into the LiCl-KCl eutectic salt was observed, following the concomitant reduction of $Nd^{3+}$ by the $Li^0$ in Li-B alloy. It was expected that the direct reduction could be restrained by maintaining the anode potential higher that the deposition potential of neodymium.