• Korean Journal of Food Science and Technology
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• v.47 no.6
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• pp.779-784
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• 2015

This study was conducted to investigate the effect of herbs on memory improvement by focusing on their cholinergic functions in Tg2576 mice. Seven herbs were used to obtain extracts by using alcohol and water. In screening test for cholinergic activities of the extracts, acetylcholinesterase (AChE) activity was highly inhibited in Oenanthe javanica alcohol extract (OJAE, 18.76%) as compared with the others. The OJAE-treated Tg2576 (Tg-OJAE) groups showed the statistically significant increases of latency time in passive avoidance test. Also, it was found that the concentration of $A{\beta}1-42$ was significantly reduced in Tg-OJAE groups compared to non-treated Tg2576 groups. In the additional enzyme test, it was found that $IC_{50}$ of OJAE was $991.77{\mu}g/mL$ and OJAE acted as an uncompetitive inhibitor of AChE. Therefore, it seemed that OJAE can be used for the development of processed foods for memory improvement.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.11a
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• pp.59-59
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• 2001

전보에서 발표한 바와 같이, 대상 라이너지 제조공장의 습부 운전조건이 지극히 악화되어 있으며 초지 시스템이 지종교체 등의 충격에 전혀 완충작용을 못하는 이유로 는 용수를 포함한 지료의 전하특성을 조절해주지 못하기 때문인 것으로 판단되었다. 특 히 양이온성 고분자로서 유일하게 사용하고 있는 보류향상제가 적절히 작용하지 못하 기 때문에 보류도가 저하되고, 제품내에 보류되지 못한 다량의 미세분이 백수 중에 존 재함으로서 결과적으로 지료의 전기적 특성을 더욱 악화시키는 악순환이 되풀이 되는 것으로 판단되었다. 이와 같이 강하게 음으로 하전된 지료의 전기적 특성을 조절하기 위해서는 양이온성 고분자의 사용량을 증가시키거나 고분자의 전하밀도 또는 분자량을 변화시켜 보는 것이 일반적인 습부첨가제 사용방법이라고 할 수 있다. 따라서 대상 습부공정의 조업조건을 호전시키기 위해서는 적절한 보류향상시스 템의 적용이 가장 시급한 현안이라고 판단되어 선규 보류제의 현장적용시험을 수행한 결과, 백수의 COD와 미세분이 격감하고 탈수성이 향상되어 습부공정의 운전조건이 호 전됨을 관측할 수 있었다. 그러나 2달 이상에 걸친 보류제 현장적용시험 기간 중에 생 산된 라이너지의 제반 물성들은 별다른 변화를 관측할 수 없었다. 이는 적용된 보류제 의 상당 부분이 계내의 미세분과 작용하여 소모되기 때문으로 판단되었다. 본 연구에서는 보류제의 투입 이전에 보류제와는 상대적으로 저분자량과 고 전 하밀도를 가진 고분자 전해질 4종을 사용하여 라이너지 지료의 전하를 중화시키고자 하였으며, 이러한 공정으로 생산된 라이너지의 물성변화를 관측하였다. 물성으로는 파 열강도, 압축강도, 습윤인장강도 및 염료 고착능력 등을 살펴보았다.시아노에틸화한 PYA가 안정된 분자구조를 유지하고 있음을 확인할 수 있었다. 시아노에틸화한 PYA용액의 점탄성 평가를 위하여 storage modulus와 loss modulus 를 분석하였다. 일반적 유변특성 평가 결과 PYA용액은 shear-thinning, pseudoplastic 한 특성을 나타내어 표면사이즈 공정에서의 적용 가능성을 확인할 수 있었다. 사용하는 통계기법 중의 하나인 주성분회귀분석을 실시하였다. 주성분 분석은 여러 개의 반응변수에 대하여 얻어진 다변량 자료의 다차원적인 변 수들을 축소, 요약하는 차원의 단순화와 더불어 서로 상관되어있는 반응변수들 상호간 의 복잡한 구조를 분석하는 기법이다. 본 발표에서는 공정 자료를 활용하여 인공신경망 과 주성분분석을 통해 공정 트러블의 발생에 영향 하는 인자들을 보다 현실적으로 추 정하고, 그 대책을 모색함으로써 이를 최소화할 수 있는 방안을 소개하고자 한다.금 빛 용사 둥과 같은 표면처리를 할 경우임의 소재 표면에 도금 및 용 사에 용이한 재료를 오버레이용접시킨 후 표면처리를 함으로써 보다 고품질의 표면층을 얻기위한 시도가 이루어지고 있다. 따라서 국내, 외의 오버레이 용접기술의 적용현황 및 대표적인 적용사례, 오버레이 용접기술 및 용접재료의 개발현황 둥을 중심으로 살펴봄으로서 아직 국내에서는 널리 알려지지 않은 본 기 술의 활용을 넓이고자 한다. within minimum time from beginning of the shutdown.및 12.36%, $101{\sim}200$일의 경우 12.78% 및 12.44%, 201일 이상의 경우 13.17% 및 11.30%로 201일 이상의 유기의 경우에만 대조구와 삭

• Journal of The Korean Association For Science Education
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• v.40 no.2
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• pp.203-216
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• 2020

The purpose of this study is to explore the effects of a VR(virtual reality)-based biology class on both the cognitive and affective domains by developing and applying a VR-based biology program for 6th-grade elementary school students. For this research, we developed a VR teaching material about 'digestion' reflecting virtual reality characteristics and one hundred five students in an elementary school in an urban area participated in this study and took three VR-based lessons. To examine the cognitive effects of a VR-based biology class, the study subjects were divided into two groups. The experimental group was composed of 50 individuals who participated in VR-based biology lessons, while 55 students of a control group learned through general lessons. We collected data using drawing tasks for measuring students' modeling performance level from these groups and analyzed the cognitive effect of VR-based instruction. We also recorded 21 interviews of students after the intervention, which were transcribed to verify the students' perception of cognitive and affective effects. The key results are as follows: First, we demonstrated the possibility of applying a VR program reflecting VR characteristics (manipulation, multi-sensory, and interaction). Second, we found out that a VR-based biology class significantly enhances higher levels of thinking (spatial, abstract, and reflective thinking). Third, we examined students' perceptions on this program and came to the conclusion that VR characteristics positively affected cognitive and affective domains. This study may be able to contribute to offering guidelines on how to apply VR-programs to future science education effectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.10
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• pp.841-850
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• 2015

With the rapid progress of electronics and radio communication technology, human enjoys greater freedom in information communication. However, EMW(Electro-Magnetic Wave) environments have become more complicate and difficult to control. Thus, international organizations, such as the American National Standard Institution(ANSI), Federal Communications Commission(FCC), the Comite Internationale Special des Perturbations Radio Electrique(CISPR), etc, have provided standard for controlling the EM wave environments and for the countermeasure of the electromagnetic compatibility(EMC). In this paper, fabrication of the smart EMW absorber which has heat radiating function and high performance absorption abilities were suggested. Furthermore, we prospected future smart EMW absorbers. The designed smart EMW absorber is fabricated following process. Firstly, we applied high temperature heat treated to a mixture of Iron-oxide($Fe_2O_3$) and ceramics. Secondly, we applied low temperature heat treated to the mixture of heat treated material and a carbon material. Lastly, we made apertures on the absorber. The designed smart EM wave absorber has the absorption ability of more than 20 dB from 2 GHz to 2.45 GHz band, respectively. Thus, it is respected that these results can be applied as various EMC devices in electronic, communication, and controlling systems.

• Culinary science and hospitality research
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• v.18 no.1
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• pp.213-227
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• 2012

This study aims to discover an effect of conflicts between work-family family-work of hotel employees on their emotional exhaustion through an empirical analysis, and to propose relevant implications. Also, the study tried to identify which role a responsive strategy may play as a moderating variable from among such influential factors. In consideration of the sales and the number of rooms at hotels as of 2010, the study conducted survey research about seven hotels located in Seoul, and carried out research with 298 copies of effective samples. In order to confirm the effect of work-family family-work on emotional exhaustion, the study undertook a multiple regression analysis and performed a moderated regression analysis for confirming the moderation effect of a responsive strategy. As a result, only the conflicts between one's work and a family had a significant effect on emotional exhaustion, and a problem-oriented responsive strategy demonstrated a moderation effect of the conflicts between work-family family-work and emotional exhaustion. In this regard, hotels should be prepared with a system which enables hotel chefs to be more faithful to both their families and household affairs through the reasonable operation of workload or an instructive system at work, and it would be possible to deal with the symptom of emotional exhaustion by conflict management through a rational analysis of the cause of conflict, if any, as well as through an alternative to such a conflict.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.10
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• pp.1347-1352
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• 2009

The effects of methanol extract of barely (Hordeum vulgare) on alcohol-induced damages of liver were investigated in male ICR mice. Mice were divided into three groups, control, ethanol, and ethanol plus 0.15% of barley extract. After four weeks of ethanol feeding, ethanol group significantly increased the P450 content, CYP2E1 and CYP1A2 enzyme activities, whereas ethanol plus barely group markedly decreased to levels similar to control group. Catalase activity in ethanol group was significantly lower than that in control group; however, ethanol plus barely group stimulated catalase activity as well as SOD activity significantly. These results indicated that barely extract modulated P450 enzymes for ethanol-induced liver damage and might be useful in developing functional food for alcoholic liver damage.

• Journal of Plant Biotechnology
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• v.42 no.2
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• pp.88-92
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• 2015

Cassava (Manihot esculenta Crantz) is a useful root crop for food, animal feed and various industrial materials including biofuel. Despite of its importance as an industrial crop, the genetic engineering approaches to manipulate transgenic plant development in cassava are limited. In this study, to develop new cultivar with high level of carotenoids and enhanced tolerance to environmental stresses, sweetpotato IbOr gene involved in accumulation of carotenoids was introduced into an Indonesian IDB high-yielding cassava cultivar under the control of oxidative stress-inducible SWPA2 promoter through Agrobacterium-mediated transformation of friable embryogenic calli. The 19 transgenic lines were successfully generated on the basis of gDNA-PCR and IbOr transcript levels for further characterization in terms of carotenoid contents and environmental stresses. Therefore, IbOr transgenic cassava plants may be developed for enhanced biomass production with high levels of carotenoids on marginal lands.

• Journal of Soil and Groundwater Environment
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• v.6 no.4
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• pp.97-112
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• 2001

The Section 12 of Groundwater Law stipulates that groundwater conservation zone should be regulated by the designation of conservation area and development restricted area, The most important policy for groundwater conservation and protection is to estimate and designate groundwater conservation zone. The groundwater classification map is utilized to determine the prime groundwater conservation areas, which delineate the first and the second ranked conservation areas of the map. According to the classification method of the Ministry of Construction and Transportation in 2000, groundwater quality for groundwater classification is classified with 4 levels based on the following conditions : (1) the present groundwater quality; (2) the potential usage as drinking water at present and in the future; (3) hydrogeological characteristics, and (4) the existence of pollution sources and activities. Throughout the initial analysis, the groundwater conservation areas are represented about 57.1$\textrm{km}^2$ in the groundwater classification map, which is 9.4% of Seoul Metropolitan Area. The management guidelines for groundwater conservation area are also developed referring to Cheju Province Groundwater Conservation Management Project and the guidelines by the Ministry of Construction and Transportation. But the specific administration and detailed technical survey should be prepared to efficiently manage the groundwater conservation area.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.540-545
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• 2010

This study was conducted to investigate effects of irrigation points on cucumber growth and water saving under greenhouse. Automatic irrigation system and tensiometers were installed at four plots to measure soil water tension and properties of irrigated water. Each plot was irrigated at different irrigation points; soil water tension of 15, 20, 30, and 40 kPa, respectively. Conventional irrigation plot without tensiometer was also investigated. The total yield and sugar contents of cucumber had no significant differences between plots. However, irrigated water volumes were saved most when irrigation points were 30, and 40 kPa. The two plots of 30, and 40 kPa treatments used about 60% less of irrigated water than the plot of conventional practice did. In conclusion, this research suggested that the optimum irrigation point for cucumber cultivation in greenhouse can be soil water tension of 30 kPa based on the results of overall cucumber quality, and Greenhouse water usage.

• Journal of Korea Water Resources Association
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• v.32 no.5
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• pp.537-545
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• 1999

This study examines three counterplans for the improvement in price structure of Korean multi-regional water supply system. First, price differentiation between industrial and residential water uses is analyzed using several pricing methods. It has been estimated that the industrial water price by the Ramsey pricing method is needed to be two to two and half times higher than the price of residential water to achieve maximum social welfare. Second, peak-load pricing is then studied to seek for the effectiveness of seasonal differentiation in water price. It has been found that consideration of dam facilities and their functions is the key factor for the effectiveness of the seasonal differentiation in water price. Finally, the discussion about the introduction of contract pricing system to the multi regional water supply system to achieve optimal investment plan for the future water demand is presented. We has found that the introduction of contract pricing system will greatly increase the efficiency in future investment plan of the multi-regional water supply system.