• 펄프종이기술
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• 제47권5호
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• pp.134-140
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• 2015

This study was carried out to evaluate whether EVAc, acryl latex and biobinder could substitute the part of SB latex for pre-coating color formula or not. Different coating colors prepared through the substitution of 30% SB latex with EVAc, acryl latex, and biobinder were applied for pre-coating layer. 100% SB latex is used as a binder for top coating color. The optical properties, gloss, roughness, stiffness, dry- and wet-pick strength were measured. There were no significant differences in the brightness, whiteness, opacity, roughness, ink set-off and gloss of paper coated with 5 different coating colors. However the stiffness, dry- and wet-pick strength were somewhat lower than those of conventional coating color which 100% SB latex was used as a binder. Although the part of SB latex could be substituted with EVAc, acryl latex and biobinder without sacrificing the qualities of coated paper. Further researches on the improvement of stiffness, dry- and wet-pick strength, and the optimization of rheology of coating color in order to improve the qualities of coated paper are strongly recommended.

• 호남수학학술지
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• 제15권1호
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• pp.121-127
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• 1993

• 농업과학연구
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• 제44권1호
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• pp.114-122
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• 2017

An experimental pick-up type pulse crop harvester was built and its harvesting performance for green kernel black bean was evaluated. Field bean loss and harvested bean quality of the harvester were analyzed according to engine speeds of 2,000; 2,400; 2,800; 3,000; and 3,200 rpm, and travel speeds of 0.6; 1.0; and 1.4 m/s. Operating conditions and field capacity of the harvester for proper harvesting were estimated. The harvester had an optimum performance at a grain moisture content of 13.4%, an engine speed of 3,000 rpm, and a travel speed of 1.2 - 1.3 m/s. Subsequently, the picking-up, discharging, and total bean loss ratios were found to be 1.6, 1.3, and 2.9%, respectively. The whole bean, damaged bean, unthreshed bean, and foreign material ratios were determined to be 96.2, 1.0, 0.1, and 0.3%, respectively. Results showed that the harvester had lower bean loss and higher harvested bean quality than those of imported bean combines. The harvester could harvest 2 rows with a crop spacing of an approximately 1.4 m. Its optimum travel speed was estimated to be approximately 1.2 m/s when harvesting performance was taken into account using such variables as field bean loss and harvested bean quality for green kernel black bean. Effective field capacity of the harvester was estimated at approximately 40 a/h.

• Journal of Korean Neurosurgical Society
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• 제66권1호
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• pp.1-2
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• 2023

• 멤브레인
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• 제14권2호
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• pp.126-131
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• 2004

균일한 밀집구조를 지니는 투명한 폴리설폰 필름이 용매를 사용한 표면처리를 통해 개질되었다. 개질은 고분자 필름을 디메털포름아마이드 용매에 1 sec간 담그고 이를 비용매 욕조에 침지시켜 이루어졌다. 개질 전 투명하였던 필름은 개질 후 횐색을 띠며, 많은 기공이 표면에 형성되었다. 비용매로서 물을 사용하였을 때가 이소프로파놀을 사용하였을 때 보다 표면의 불균일도가 증가하였다. 개질된 필름을 사용하여 방사성핵종으로 오염된 지역으로부터 오염물을 채취하였을 때 일반적으로 사용되는 필터페이퍼를 사용하는 것보다 우수한 채취 효율을 보여주었다. 개질된 필름 중에서는 비용매로 물을 사용한 경우 이소프로파놀을 이용한 필름보다 오염물의 채취 효과가 좋은 것으로 나타났다. 한편, 개질된 필름은 고분자 필름의 양쪽 겉표면만을 변화시켜, 필름의 내부는 고유한 밀집도를 유지함으로써, 필터페이퍼 또는 유리섬유를 사용한 오염물 제거 과정에서 나타날 수 있는 매체의 기공을 통한 2차적 오염을 방지하는 효과가 있다.

• 대한수학교육학회지:학교수학
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• 제13권1호
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• pp.175-187
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• 2011

본 연구는 폴리오미노에 What if (not)?이라는 기법을 적용하여 영재학급용 수학수업 소재를 발굴하고 이를 수업에 활용한 사례 분석을 통해 수학영재교육의 시사점을 도출하고자 한다. 이를 위해 학생들이 흔히 접할 수 있는 블로커스라는 게임을 사용하여 폴리오미노의 특징을 이해하도록 구성하였고, 한중일 동양 3국의 전통적인 두뇌스포츠인 오목이라는 게임을 접목한 탐구 활동을 개발하였다. 블로커스 오목이라는 새로운 소재에 Pick의 정리를 적용하면서, 블로커스 오목 활동을 하는 동안 창의적인 학습이 되도록 구성하였다. 본 연구는 수학 수업 소재를 발굴 및 활용하여 학생들에게서 나타나는 각 소재별 특징과 결과를 바탕으로 최종적인 수업 소재를 제안하였다. 이를 통해 초등학교 수학영재 학생과 교사들을 위한 5가지 시사점을 얻을 수 있었다.

• 자연과학논문집
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• 제10권1호
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• pp.103-109
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• 1998

본 연구는 오존의 강한 산화력을 이용하여 기상의 처리방법에 따른 비스코스 레이온의 탈색효과를 연구하였다. 오존이 발생할 때는 기체상태로 고농도이지만, 수용액 상태로 물에 녹이는 과정에서 기화요인에 의하여 오존의 손실이 많았다. 따라서 기존의 오존처리방법인 수용액상태의 처리방법이 아니라 기상의 오존을 직접 직물에 처리하므로 고농도의 오존을 단시간동안 처리하여 직물에 존재하는 색소를 산화시켜 탈색하는 방법을 사용하였다. 기상의 오존은 직접 유기색소와 반응하지 않기 때문에 물을 매개체로 하여 pick up ratio를 60%, 50%, 40%, 30%, 20%로 변화시키면서 비스코스 레이온의 탈색에 대하여 연구하였다. Pick up ratio가 40%일 때가 유기색소를 분해하는데 필요한 최적의 수산기가 발생하므로 처리포의 탈색효과가 가장 좋았다. 그러나 처리기간이 길수록 너무 과다하게 오존에 의해 산화되므로 강도와 신도의 저하를 초래하였다. 따라서 최적의 기상오존 처리시간은 60분정도에서 처리하는 것이 강도와 신도의 저하를 가장 적게 할 수 있고 백도도 향상시킬 수 있는 것으로 사료된다.

• 한국수정란이식학회지
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• 제12권2호
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• pp.211-218
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• 1997

This experiment was carried out to develop the anesthetic methods for ultrasonography and a new simplified disposable needle guidance device for ovum pick-up(OPU) in cows. Three different anesthetic methods were applied as. 1) epidural analgesia only with 2% lidocaine(20~30 ml), 2) epidural analgesia with 2% under general sedation with xylazine, 3) epidural analgesia with 2% lidocaine under general sedation with detomidine. We evaluated the anesthetic effects with items such as relaxation of anal sphincter, tail movement and rectal wall, retractability of both ovaries, additional anesthesia and possibility of OPU. Through this experiment, the above three anesthetic methods were applicable to OPU, but the epidural anlagesia under general sedation with detomldine was most effective for OPU. We developed a new disposable needle guidance device with stainless steel tube. With this, disposable needles can be easily attatchable to any other intravaginal probes. And also, it was found to he practical, economic and effective for OPU with the recovery rate of 51.2%.

• Management Science and Financial Engineering
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• 제10권2호
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• pp.1-28
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• 2004

The integrated supply chain of business partners for e-Commerce in cyber space is defined as Logistics Chain if the cooperative activities are logistics-related. Logistics Chain could be managed effectively and efficiently by cooperative technologies of logistics chain execution. In this paper, we propose a routing and scheduling algorithm based on the Tabu search by adding geographical information into existing constraint for pick-up and delivery process to minimize service time and cost in logistics chain. And, we also consider an uncertainty processing for the tracing of moving object to control pick-up and delivery vehicles based on GPS/GIS/ITS. Uncertainty processing is required to minimize amount of telecommunication and database on vehicles tracing. Finally, we describe the Logistics Chain Execution (LCE) system to perform plan and control activities for postal logistics chain. To evaluate practical effects of the routing and scheduling system, we perform a pretest for the performance of the tabu search algorithm. And then we compare our result with the result of the pick-up and delivery routing plan generated manually by postmen.

• BMB Reports
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• 제51권2호
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• pp.79-84
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• 2018

Niemann-Pick type C disease (NP-C) is a fatal neurodegenerative disorder caused by a deficiency of NPC1 gene function, which leads to severe neuroinflammation such as astrogliosis. While reports demonstrating neuroinflammation are prevalent in NP-C, information about the onset and progression of cerebellar astrogliosis in this disorder is lacking. Using gene targeting, we generated vascular endothelial growth factor (VEGF) conditional null mutant mice. Deletion of VEGF in cerebellar Purkinje neurons (PNs) led to a significant increase of astrogliosis in the brain of NP-C mice in addition to the loss of PNs, suggesting PN-derived VEGF as an important factor in NP-C pathology. Moreover, replenishment of VEGF in neurons improved brain pathology in NP-C mice. Overall, our data provide a new pathological perspective on cerebellar astrogliosis in NP-C and suggest the importance of VEGF as a therapeutic target for this disease.