• Coupled systems mechanics
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• 제9권1호
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• pp.77-89
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• 2020

This study is dedicated to the dynamic elasticity problem for a semi-strip. The semi-strip is loaded by the dynamic load at the center of its short edge. The conditions of fixing are given on the lateral sides of the semi-strip. The initial problem is reduced to one-dimensional problem with the help of Laplace's and Fourier's integral transforms. The one-dimensional boundary problem is formulated as the vector boundary problem in the transform's domain. Its solution is constructed as the superposition of the general solution for the homogeneous vector equation and the partial solution for the inhomogeneous vector equation. The matrix differential calculation is used for the deriving of the general solution. The partial solution is constructed with the help of Green's matrix-function, which is searched as the bilinear expansion. The case of steady-state oscillations is considered. The problem is reduced to the solving of the singular integral equation. The orthogonalization method is applied for the calculations. The stress state of the semi-strip is investigated for the different values of the frequency.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.56-59
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• 2009

In the nineties the invention of the InGaN blue LED has innovated illumination technology. Currently LCD backlighting and more and more general lighting applications are based on white LEDs comprising of inorganic phosphors and blue emitting InGaN chip. Well established phosphor materials are ortho silicates and garnets like yellow emitting YAG:Ce. In our paper we demonstrate that garnet materials also allow for green light emission for both, general lighting and backlighting LED applications.

• 한국재료학회지
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• 제21권6호
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• pp.352-356
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• 2011

[ $Zn_{2(1-x)}Mn_xSiO_4$ ]$0.07{\leq}x{\leq}0.15$) green phosphor was prepared by solid state reaction. The first heating was at $900^{\circ}C-1250^{\circ}C$ in air for 3 hours and the second heating was at $900^{\circ}C$ in $N_2/H_2$(95%/5%) for 2 hours. The size effect of $SiO_2$ in forming $Zn_2SiO_4$ was investigated. The temperature for obtaining single phase $Zn_2SiO_4$ was lowered from $1100^{\circ}C$ to $1000^{\circ}C$ by decreasing the $SiO_2$ particle size from micro size to submicro size. The effect of the activators for the Photoluminescence (PL) intensity of $Zn_2SiO_4:Mn^{2+}$ was also investigated. The PL intensity properties of the phosphors were investigated under vacuum ultraviolet excitation (147 nm). The emission spectrum peak was between 520 nm and 530 nm, which was involved in green emission area. $MnCl_2{\cdot}4H_2O$, the activator source, was more effective in providing high emission intensity than $MnCO_3$. The optimum conditions for the best optical properties of $Zn_2SiO_4:Mn^{2+}$ were at x = 0.11 and $1100^{\circ}C$. In these conditions, the phosphor particle shape was well dispersed spherical and its size was 200 nm.

• Journal of Microbiology and Biotechnology
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• 제31권4호
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• pp.550-558
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• 2021

Lactobacillus kefiranofaciens contains two types of β-galactosidase, LacLM and LacZ, belonging to different glycoside hydrolase families. The difference in function between them has been unclear so far for practical application. In this study, LacLM and LacZ from L. kefiranofaciens ATCC51647 were cloned into constitutive lactobacillal expression vector pMG36e, respectively. Furtherly, pMG36n-lacs was constructed from pMG36e-lacs by replacing erythromycin with nisin as selective marker for food-grade expressing systems in Lactobacillus plantarum WCFS1, designated recombinant LacLM and LacZ respectively. The results from hydrolysis of o-nitrophenyl-β-galactopyranoside (ONPG) showed that the β-galactosidases activity of the recombinant LacLM and LacZ was 1460% and 670% higher than that of the original L. kefiranofaciens. Moreover, the lactose hydrolytic activity of recombinant LacLM was higher than that of LacZ in milk. Nevertheless, compare to LacZ, in 25% lactose solution the galacto-oligosaccharides (GOS) production of recombinant LacLM was lower. Therefore, two β-galactopyranosides could play different roles in carbohydrate metabolism of L. kefiranofaciens. In addition, the maximal growth rate of two recombinant strains were evaluated with different temperature level and nisin concentration in fermentation assay for practical purpose. The results displayed that 37℃ and 20-40 U/ml nisin were the optimal fermentation conditions for the growth of recombinant β-galactosidase strains. Altogether the food-grade Expression system of recombinant β-galactosidase was feasible for applications in the food and dairy industry.

• 한국콘텐츠학회논문지
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• 제19권6호
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• pp.236-248
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• 2019

수도권의 그린벨트는 도시 경계선을 설치하여 생태 보호체계를 구축하고 도시의 탄성을 강화하는 데 목적이 있다. 베이징시에서 현재 진행되고 있는 도시종합계획이 실시되는 기한 동안 두 그린벨트가 포함하는 지역의 녹색 공간은 변화에 따라 그 비율에 큰 차이가 존재한다. 본 연구는 이를 출발점으로 삼아 '도시 구조체계요소' 및 '정책과 계획요소'가 녹색 공간 규모의 변화와 갖는 상관성을 연구하여, 베이징시 녹색 공간의 계획 시행에 영향을 미치는 요소들을 탐구하고자 한다. 본 연구는 다변량 선형 회귀 모형을 이용하여 베이징의 두 그린벨트를 대상으로 삼아 도시체계요소 및 계획정책요소(독립 변수)와 그린벨트 내의 건설용 토지의 증가(종속 변수)간의 상관관계를 검증하였다. 인구밀집과 건설용 토지가 확장될 수 있는 동력의 영향을 받아 산지, 물가, 단위 면적당 임대료, 대중교통의 접근성, 신설된 국가 소유의 건설용 토지 등 도시체계요소는 녹색 밸트 내의 건설용 토지의 규모 변화와 상관관계를 보인다는 것을 알 수 있었다.

• 한국식품영양과학회지
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• 제42권3호
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• pp.487-496
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• 2013

커피의 생리활성을 증진시키기 위해 고체발효를 이용하여 인도네시아산 Mandheling 커피생두에 3종의 버섯 균사체(Phellinus linteus, PL; Hericium erinaceum, HE; Ganoderma lucidum, GL) 및 2종의 홍국균 균사체(Monascus purpureus, MP; Monascus ruber, MR)를 배양하였다. 균사체-고체발효 커피생두를 로스팅하여 얻은 원두커피는 decoction법에 의한 열수추출물과 reflux에 의한 에탄올추출물로 조제하였는데, 열수추출물(HW, 수율 17.7~25.3%)은 에탄올추출물(EE, 9.5~12.2%)보다 더 높은 수율을 나타내었다. 2종의 홍국균 균사체-고체발효 커피생두로부터 조제된 원두커피 열수추출물(MP-CB-HW, MR-CB-HW)은 비발효 원두커피 또는 3종 버섯 균사체-고체발효 원두커피 열수추출물보다 높은 총 폴리페놀 및 플라보노이드 함량과 DPPH 자유라디칼 소거능을 나타내었다. 또한, 홍국균 균사체-고체발효 원두커피 중에서도 MR-CB-HW는 가장 높은 마크로파지 활성과 마이토젠 활성을 나타내었다(CB-HW의 1.32배와 1.40배). MP-CB-EE와 MR-CB-EE는 $100{\mu}g/mL$의 시료농도에서 세포에 대한 독성을 나타내지 않으면서도 LPS로 유도된 RAW 264.7 세포의 산화질소(NO)의 생성을 효과적으로 억제하였다(LPS 처리군의 38.6과 37.0%). 한편, 홍국균 균사체를 이용한 고체발효는 카페인 함량에 영향을 주지 않으면서 클로로겐산을 유의적으로 증가시켰다($76.21{\sim}76.73{\mu}g/mL$). 결론적으로 원두커피의 생리활성은 M. purpureus 또는 M. ruber와 커피생두의 고체발효에 의해서 증진되었으며 이러한 결과는 홍국균-고체발효 원두커피가 기능성 커피음료의 소재로 이용될 가능성을 제시하는 것으로 사료된다.

• Food Science and Biotechnology
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• 제15권5호
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• pp.799-804
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• 2006

Ingestion of green tea has been shown to decrease prostaglandin $E_2$ levels in human colorectum, suggesting that tea constituents modulate arachidonic acid metabolism. In the present study, we investigated the effects of four purified green tea catechins, (-)-epicatechin (EC), (-)-epigallocatechin (EGC), (-)-epigallocatechin-3-gallate (EGCG), and (-)-epicatechin-3-gallate (ECG), on the catalytic activity of cytosolic phospholipase $A_2$ ($cPLA_2$) and release of arachidonic acid and its metabolites from intact cells. At $50\;{\mu}M$, EGCG and ECG inhibited $cPLA_2$ activity by 19 and 37%, respectively, whereas EC and EGC were less effective. The inhibitory effects of these catechins on arachidonic acid metabolism in intact cells were much more pronounced. At $10\;{\mu}M$, EGCG and ECG inhibited the release of arachidonic acid and its metabolites by 50-70% in human colon adenocarcinoma cells (HT-29) and human esophageal squamous carcinoma cells (KYSE-190 and 450). EGCG and ECG also inhibited arachidonic acid release induced by A23187, a calcium ionophore, in both HT-29 and KYSE-450 cell lines by 30-50%. The inhibitory effects of green tea catechins on $cPLA_2$ and arachidonic acid release may provide a possible mechanism for the prevention of human gastrointestinal inflammation and cancers.

• 대한가정학회지
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• 제19권3호
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• pp.41-45
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• 1981

This study was carried out to observe the changes of Vitamin C content and to preserve the quality for the circulation periods of hot green pepper fruits wrapped with polyethylene film under the indoor temperature, as well as to find the proper time for harvest of hot green pepper fruits as a hot taste food and vegetable. the results obstained were as follows: 1. The consignment rate of hot green pepper fruits was highest, 60.2% on the 25th day after flowering, the nest 25.4% on the 20 th day, 10.3% on the 30th day and 4.1% on the 35th day. 2. the content of Vitamin C I each pepper fruits was highest o the 30th day, considerably high on the 25th day and 20th day. 3. The total content of Vitamin C in each part of hot green pepper fruits; the content in pericarp was much higher than in placenta and seed, and that of hydro type Vitamin C was almost the same. 4. The reduction rate of vitamin C during circulation periods was highest on the 3rd day; 42% in pericarp, 50% in placenta, 65% in seed. But in the package wrapped up with polyethylene film, the reduction rate in the same period was 5% in pericarp, which was very low in reduction, and those in placenta and seed were almost the same as in the unwrapped state.

• 한국디지털건축인테리어학회논문집
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• 제13권2호
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• pp.35-43
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• 2013

The green building is one of biggest factors to go the goal of energy saving and environmental conservation, "reduction of energy consumption, friendly energy technology, recycling of resource, and environmental pollution reduction technology. The purpose of these green buildings realized by the energy-saving technology such as the thermal bridge breaker(or thermal bridge block). Thermal bridges are localized elements that penetrate insulated portions of building envelope that results in heat loss. The purpose of this paper is to describe the technical interactions for patents of a thermal bridge breaker(TTB) used in green building practices, and be subject to investigation to TTB in the leading countries, that is, United State, Europe Union, Japan, and Korea. As a result, there are four TTB categories(roof, wall-slab connection, opening, footing) in house or building. The TTB categories is remarkable technology that is apparatus in slab-wall joints and sealing element of opening frame in walls.

• 교육시설 논문지
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• 제20권5호
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• pp.19-26
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• 2013

In this rapidly changing environment in 21st century, countries around the world interact closely with one another to respond to changes. Universities are not an exception in this trend. As the home of knowledge, universities are exercising more influence on the state and local communities than before as well as being asked to come up with new requirements to respond to such changes. The study aims to derive new concept of sustainable green campus planning based on theories and researches of university facilities planning and campus planning to respond to university's needs for sustainable growth, enhanced competitiveness and globalization. Through the case study of green campuses, this study analyzes the types and characteristics of green campuses, and redefines the elements of its architectural planning. Design elements drawn by centered architectural design are classified, and this research presents the new concept of campus planning by using this classified elements. This is a new concept of campus planning application as a prototype, and in the further study, a variety of examples and detailed sector research is required.