• 펄프종이기술
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• 제47권6호
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• pp.130-138
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• 2015

This study was conducted to investigate the effect of the strengthening treatment of methyl cellulose (MC) on properties and aging characteristics of the dewaxed papers during humid heating aging. Beeswax-treated Hanji was dewaxed by the supercritical fluid extraction method, and subsequently the strengthening treatment was performed with MCs having three different viscosities. MC was first applied by dipping a dewaxed paper into a MC solution whose concentration was controlled from 0.5% to 1.5%. After the strengthened papers were artificially aged at $80^{\circ}C$ and 65% RH, the changes in optical and mechanical properties of the samples were evaluated. The results show that viscosity and especially pick-up of MC influenced the strengthening efficiency and aging characteristics of dewaxed paper. Strength was increased with the MC coating weight; in addition, strengthening with MC improved preservability of the dewaxed paper. The optimum conditions for the strengthening with MC was found to be the coating ratio of 4% with 1500 cP MC.

• 농업과학연구
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• 제51권1호
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• pp.53-61
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• 2024

A total of 180 21-day-old weaning pigs ([Yorkshire × Landrace] × Duroc) with an initial body weight of 6.44 ± 0.01 kg were randomly assigned to 9 treatments for evaluating the effects of replacing dietary inorganic copper (Cu) and zinc (Zn) with glycine (Gly) or methionine (Met)-chelated Cu and Zn on growth performance and nutrient digestibility. The experimental period was 35 days. There were four replicated pens per treatment, with five pigs (three males and two females) per pen. Dietary treatments consisted of a basal diet (CON), in which the sources of Cu and Zn were in inorganic form. The inorganic Cu and Zn in the basal diet were replaced by glycine-chelated (GC) and methionine-chelated (MC) Cu and Zn by 30, 50, 70, or 100% to form the GC1, GC2, GC3, GC4, or MC1, MC2, MC3, MC4 groups. The 100% replacement of dietary inorganic Cu and Zn with GC or MC increased (p < 0.05) average daily gain, average daily feed intake, and gain-to-feed ratio. The complete replacement of dietary inorganic Cu and Zn with GC or MC led to enhanced (p < 0.05) digestibility of dry matter, nitrogen, Cu and Zn. Thus, the replacement of inorganic Cu and Zn with GC or MC can improve the growth efficiency and nutrient utilization of weaning pigs.

• Parasites, Hosts and Diseases
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• 제45권4호
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• pp.295-299
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• 2007

The purpose of this study was to investigate whether sporulated Neospora caninum oocysts, which had been stored for 46 mo in a 2% sulfuric acid solution at $4^{\circ}C$, remain morphologically viable and infective to gerbils (Meriones unguiculatus). Six gerbils were orally inoculated with doses of 400 or 1,200 oocysts. Two mo after inoculation, the animals did not show any clinical signs, had no histological lesions, and were seronegative for N. caninum at 1:50 in an immunofluorescent antibody test. PCR using the brain from each gerbil did not reveal N. caninum specific DNA. We conclude that oocysts preserved for 46 mo are not infective, despite being morphologically intact.

• International Journal of Precision Engineering and Manufacturing-Green Technology
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• 제5권5호
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• pp.605-612
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• 2018

This work investigates the relationships between the static mechanical properties of Ti-6Al-4V manufactured through selective laser melting (SLM) and post-process heat treatments, namely stress relieve, annealing and hot isostatic pressing (HIP). In particular, Ti-6Al-4V parts were fabricated in three different build orientations of X, Z, and $45^{\circ}$ to investigate the multi-directional mechanical properties. The results showed that fully densified Ti-6Al-4V parts with densities of up to 99.5% were obtained with optimized SLM parameters. The microstructure of stress relieved and mill annealed samples was dominated by fine ${\alpha}^{\prime}$ martensitic needles. After HIP treatment, the martensite structure was fully transformed into ${\alpha}$ and ${\beta}$ phases (${\alpha}+{\beta}$ lamellar). Within the realm of tensile properties, the yield and ultimate strength values were found statistically similar with respect to the built orientation for a given heat treatment. However, the ductility was found orientation dependent for the HIP samples, where a lower value was observed for samples built in the X direction.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.788-793
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• 2007

중소제조업체들은 원가 절감과 생산성 향상을 위해 생산정보시스템을 도입, 운영하고 있으나 이에 대한 성과평가 연구가 전무하여, 최고경영자는 생산정보 시스템 투자여부 등을 결정하는데 어려움을 겪고 있다. 이에 본 논문에서는 DeLane and McLean(2003)의 연구 모형을 바탕으로, 생산정보 시스템 투자에 대한 성과평가 모형을 제시하고, 모형 검증을 위해 생산정보시스템을 도입한 중소기업을 대상으로 설문조사를 실시하였다. 설문 분석결과 생산정보시스템의 도입을 통해 기업의 순효익(Net Benefjts)이 향상된 것으로 나타났다.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2005년도 춘계학술대회
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• pp.381-389
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• 2005

정보시스템 구축비용의 급격한 증가로, 정보시스템 성과 분석은 이슈가 되고 있고, 정보시스템의 중요성과 이에 대한 의존성은 날로 증가하고 있다. 현재까지 정보시스템 성과에 관해서는 기존 연구들을 정리한 DeLone & McLean(1992)의 정보시스템 성공 모형(IS Success Model)을 근거로 이를 구성하는 각 요소들을 검증하거나 영역을 확장하고자 하는 연구들이 진행되어왔다. 본 연구에서는 DeLone & McLean(1992)의 정보시스템 성공 모형(IS Success Model)을 기반으로 특정 정보시스템 담당자들을 대상으로 정보시스템의 품질, 이용, 효과에 관한 연관관계를 실증 분석하였다.

• Nuclear Engineering and Technology
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• 제52권9호
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• pp.1896-1906
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• 2020

The BEAVRS (Benchmark for Evaluation and Validation of Reactor Simulation) benchmark calculations were performed by DeCART stand-alone and DeCART/MATRA multi-physics coupled code system to verify their accuracy. The solutions of DeCART stand-alone calculations for the control rod bank worth, detector signal, isothermal temperature coefficient, and critical boron concentration agreed very well with the measurements. The root-mean-square errors of the boron letdown curves for two-cycles were less than about 20 ppm, while the individual and total control rod bank worth agreed well within 7.3% and 2.4%, respectively. For the BEAVRS benchmark calculations at the beginning of burnup, the difference between DeCART simplified thermal-hydraulic stand-alone and DeCART/MATRA coupled calculations were not significantly large. Therefore, it is concluded that both the DeCART stand-alone code and the DeCART/MATRA multi-physics coupled code system have the capabilities to generate high fidelity transport solutions at core follow calculations.

• Molecules and Cells
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• 제43권2호
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• pp.139-144
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• 2020

Somatic RUNX1 mutations are found in approximately 10% of patients with de novo acute myeloid leukemia (AML), but are more common in secondary forms of myelodysplastic syndrome (MDS) or AML. Particularly, this applies to MDS/AML developing from certain types of leukemia-prone inherited bone marrow failure syndromes. How these RUNX1 mutations contribute to the pathobiology of secondary MDS/AML is still unknown. This mini-review focusses on the role of RUNX1 mutations as the most common secondary leukemogenic hit in MDS/AML evolving from severe congenital neutropenia (SCN).

• 한국IT서비스학회지
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• 제14권2호
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• pp.289-314
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• 2015

Recently, Most of the companies and government offices are under consideration about the adoption of cloud office service to actualize the smart work policies. Comparing with traditional office software, a cloud office service have the advantage of the method of payment and coming over the physical limitations. Many cloud office service users tend to adopt an official evaluated the service without doubt. However after deciding to adopt cloud office service, many users are faced with a variety of problems and difficulties practically. In this study, researchers carried out interview about those problems and difficulties after adopting a cloud office service. Consequently, there are several problems and difficulties such as compatibility, document security, document lost and maladjusted to the new graphic user interface between traditional office software and a cloud office service. A cloud office service have still several advantages not only a competitive price but also ubiquitous attributes. Thus, researchers need to study about what kinds of reason variables can solve those problems and difficulties. In existing research, DeLone & McLean have suggested information system success model. They use three independent variables which are system quality, information quality, service quality. Parameters are user satisfaction, intention to use and use. Lastly, dependent variables are net benefits. However in this study, we need to change the scope of measurement. In other words, we have to replace parameters with dependent variables. Simply, user satisfaction, intention to use and use is going to be dependent variables. There are several reasons why we need changing variables. First, we aim at giving a some suggestions to a cloud service providers which independent variables do not work to satisfy for the users. Second, we need to find out how to maximize cloud office service user's satisfaction and intention to use. Third, we should firstly know that relationship between independent variables and dependent variables. Finally, those research results give for the cloud office service provider to solve the cloud office service adopting problems and difficulties.

• 한국콘텐츠학회논문지
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• 제14권12호
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• pp.904-910
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• 2014

정보시스템 성공 모형은 1992년 DeLone and McLean의 D&M 모형이 2003년 개선모형에 이르기 까지 이커머스, 교육시스템등과 같이 다양한 분야에 적용되어 사용되어왔으며, 메타분석이 이루어 질 정도로 그 적용 연구의 수 또한 많다. 하지만, 이는 최종사용자(End-user)기준으로 이루어졌으며 사용자가 어떠한 요인들을 정보시스템의 성공 선행요인으로 인지하는지에 대한 결론을 줄 수 있으나 개발자(Developer)가 이를 적용하기에는 인지하는 품질과 양적인 비교가 불가능하기 때문에 어떤 부분을 얼마나 노력해야 하는지에 대한 연구가 필요하다. 따라서 본 연구에서는 A은행의 정보시스템 개발자와 사용자를 대상으로 D&M 정보시스템 성공 모형을 적용하고, 다중집단 구조방정식모델을 사용하여 그 차이를 설명하고자 한다.