• 한국축산식품학회지
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• 제27권4호
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• pp.543-547
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• 2007

본 연구에서는 원유와 사일리지, 전통발효식품 등으로부터 유방염 원인균에 대한 항균성을 가지는 유산균을 분리하였고, 이들 중 원유에서는 79, 91-3 균주와 전통발효식품에서는 SA131, NK24, NK34, 32, 44-1 균주, 사일리지에서는 253, 261, 262, 263, 265 균주, 닭분변에서 B32, C23 균주에서 유방염 원인균에 대한 비교적 높은 항균력을 확인할 수 있었다. 이를 통해 새로운 항생제 대체물질의 가능성을 확인할 수 있었다.

• Asian Spine Journal
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• 제12권6호
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• pp.1069-1077
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• 2018

Study Design: A case study. Purpose: To assess the chronological changes of the disease-related kyphosis after chemotherapy alone, secondly to clarify the role of growth cartilage in the healed lesion on kyphosis change, and to define the accurate prediction time in assessing residual kyphosis. Overview of Literature: None of the previous papers up to now dealt with the residual kyphosis, stability and remodeling processes of the affected segments. Methods: One hundred and one spinal tuberculosis children with various stages of disease processes, age 2 to 15 years, were the subject materials, between 1971 to 2010. They were treated with two different chemotherapy formula: before 1975, 18 months of triple chemotherapy (isoniazid [INH], para-aminosalicylic acid, streptomycin); and since 1976, 12 months triple chemotherapy (INH, rifampicin, ethambutol, or pyrazinamide). The first assessment at post-chemotherapy one year and at the final discharge time from the follow-up (36 months at minimum and 20 years at maximum) were analyzed by utilizing the images effect of the remaining growth plate cartilage on chronological changes of kyphosis after initiation of chemotherapy. Results: Complete disc destruction at the initial examination were observed in two (5.0%) out of 40 cervical spine, eight (26.7%) out of 30 dorsal spine, and six (19.4%) out of 31 lumbosacral spine. In all those cases residual kyphosis developed inevitably. In the remainders the discs were partially preserved or remained intact. Among 101 children kyphosis was maintained without change in 20 (19.8%), while kyphosis decreased in 14 children (13.7%), and increased in 67 children (66.3%) with non-recoverably damaged growth plate, respectively. Conclusions: It could tentatively be possible to predict the deformity progress or non-progress and spontaneous correction at the time of initial treatment, but it predictive accuracy was low. Therefore, assessment of the trend of kyphotic change is recommended at the end of chemotherapy. In children with progressive curve change, the deformity assessment should be continued till the maturity.

• 한국의류산업학회지
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• 제21권2호
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• pp.203-208
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• 2019

This paper considers the moisture permeability and fashion in the upper fabrics of cotton fabric shoes woven into various tissues and properties measured to examine the use as upper fabrics. We measured the tissues of the manufactured upper fabric are 1/3 twill, $4{\times}4$ weft rib, Maya, Triple, Deformed twill design (DTD), Diamond tissues and tear strength, tensile strength, breaking elongation, stretching under load at 100N, stitch tear resistance, and fastness. In the case of $4{\times}4$ weft rib, the tear strength and tensile strength were excellent; however, the elongation and stitch tear resistance at 100N load were less than the standard value. DTD fabrics are characterized by physical properties in the warp direction that are superior to those in the weft direction; however, the tear strength and tensile strength in the weft direction are less than the standard value. The 1/3 twill fabrics showed high tensile strength value and stitch tear resistance value in the warp direction; however, toughness, the main property of the shoe upper, was below the standard value. Triple and diamond fabrics, which have a significant effect on the performance of the shoe upper fabric, also had less than the standard value of tear strength. Maya upper fabric for shoes has better properties than other upper fabrics except for the elongation at break, and the stitch tear resistance has a value of 178% in the warp direction and 214% in the weft direction compared to the standard value. Therefore, the Maya fabric showed the possibility of being used as an upper textile for shoes.

• 한국ITS학회 논문지
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• 제20권4호
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• pp.83-94
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• 2021

본 논문에서는 GBAS의 VDB 시스템에 사용되는 4각 배열 다이폴 안테나를 하나의 안테나로 대체할 수 있는 3중 폴디드 무지향성 마이크로스트립 안테나(중심주파수 118 MHz)를 제안하였다. 먼저 λ/2 마이크로스트립 안테나에서 무지향성 방사 패턴을 얻기 위해 λ/4로 폴디드된 안테나를 제작하였으며, 또한 섭동 효과를 이용하여 3중 폴디드 형태의 소형화된 안테나로 변형시켰다. 그 결과, 중심주파수 118MHz 대역에서 S₁₁은 -13.91 dB, -10 dB 대역폭은 1.5 MHz(1.27%)의 특성을 얻었다. 또한, yz-plane, xy-plane에서 E_θ 성분이 전방향성 방사 패턴을 나타내며, 안테나의 크기는 기준안테나 대비 64.2% 소형화를 얻어, 최종적으로 제안된 하나의 안테나로써 GBAS의 VDB용 안테나로써 적합함을 확인하였다.

• Journal of Electrochemical Science and Technology
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• 제13권1호
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• pp.112-119
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• 2022

Molten carbonate fuel cells (MCFCs) are environmentally friendly, large-capacity power generation devices operated at approximately 650℃. If MCFCs are to be commercialized by improving their competitiveness, their cell life should be increased by operating them at lower temperatures. However, a decrease in the operating temperature causes a reduction in the cell performance because of the reduction in the electrochemical reaction rate. The cell performance can be improved by introducing a coating on the cathode of the cell. A coating with a high surface area expands the triple phase boundaries (TPBs) where the gas and electrolyte meet on the electrode surface. And the expansion of TPBs enhances the oxygen reduction reaction of the cathode. Therefore, the cell performance can be improved by increasing the reaction area, which can be achieved by coating nanosized LiCoO₂ particles on the cathode. However, although a coating improves the cell performance, a thick coating makes gas difficult to diffuse into the pore of the coating and thus reduces the cell performance. In addition, LiCoO₂-coated cathode cell exhibits stable cell performance because the coating layer maintains a uniform thickness under MCFC operating conditions. Therefore, the performance and stability of MCFCs can be improved by applying a LiCoO₂ coating with an appropriate thickness on the cathode.

• 대한화학회지
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• 제42권1호
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• pp.9-15
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• 1998

Dimethyldioxirane$[(CH_3)_2CO_2]$의 분자구조, vibrational frequencies 그리고 infrared(IR) 스펙트럼의 세기(intensity)등에 대한 이론적 연구를 high level ab initio 양자역학적 방법(CISD,CCSD, CCDS(T))을 사용하여 수행하였다. 분자구조의 경우 C-O와 O-O에 대한 결합길이는 parent dixoirane$(CH_2O_2)$과 유사한 결과를 보여주었으며, electron correlation effect의 영향이 C-C나 C-H결합길이 보다 더 크게 작용하였다. 사용된 basis sets(DZ,DZP, TZP, 그리고 TZ2P)에 대해서는 polarization function의 역할이 매우 중요한 것으로 나타났으며 triple zeta(TZ)에 의한 효과는 상대적으로 나타났다. 한편 계산된 harmonic vibrational frequency들을 실험결과 및 다른 이론 계산결과와 비교, 분석하였으며 IR intencity에 근거하여 각 vibrational mode를 assign하였다.

• 동의생리병리학회지
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• 제26권3호
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• pp.381-385
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• 2012

We investigated the eradication rate and the adverse effects of combined treatment with western and oriental medication on Helicobacter pylori infected patients. We studied the eradication rate and the adverse effects of 1-week-triple therapy and 2-week-oriental medication(Banhasasimtang or Hyangsapeungeuysan) on Helicobacter pylori infected patients confirmed by urea breath test. Comparing 5 patients who took combined treatment with western and oriental medication, the results of this study showed that 4 patients got eradication effect of Helicobacter pylori with no influence on liver and kidney function. A patient had diarrhea and another patient had satiety after meals because of an adverse effect. Despite some possitive effect, the treatment did not make the Quality of Life improved. The findings of this study supports the adverse effects of combined treatment with western and oriental medication for the treatment of Helicobacter pylori infection.

• 한국미생물·생명공학회지
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• 제47권1호
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• pp.34-42
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• 2019

Apigenin, a common natural product that is found in many plants and vegetables, has been reported to have many biological activities, including antioxidative, anti-inflammatory, and anticancer effects. The triple-negative breast carcinoma cell line MDA-MB-231 is known to be highly invasive and resistant to chemotherapy. In this study, we investigated the anticancer effect of apigenin on human MDA-MB-231 cells. First, the cytotoxicity of apigenin toward MDA-MB-231 cells was analyzed by MTT assay. Then, the cell cycle and apoptotic effects of apigenin were examined, and the molecular mechanism underlying its anticancer activity was explored. Apigenin inhibited the growth of the cells in a dose-dependent manner, correlating with the cell cycle arrest at the G2-M phase as well as an increase of early apoptosis. The cell-cycle inhibitory effect was highly associated with the increased expression of p21 and decreased expression of CDK6, cyclin D1, and cyclin B1. The induction of apoptosis by apigenin was associated with the upregulated expression of cleaved PARP and cleaved caspase-3, -7, and -9.

• 한국식품위생안전성학회지
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• 제22권4호
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• pp.365-369
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• 2007

본 연구는 현재 유통 판매되고 있는 쌀뜨물 발효액 라이젠의 살균소독력을 평가하기 위해 최적 조건 탐색 연구 및 오염된 행주에 대한 일반적인 세척 및 소독제들과의 살균력 비교 실험을 실시하였다. 라이젠은 2 또는 3배 희석 용액에서 2시간 처리하였을 때 $2.65\;log_{10}cfu/g$의 E. coli를 감소시켜 가장 우수한 효과를 나타내었다. 또한 라이젠 농축액의 경우 원액과 2배 희석한 용액에서 각각 2, 5시간 처리하였을 때 완전 살균효과를 나타내었다. 반면 $3{\sim}5$배 희석한 용액은 24시간 동안 처리해야만 완전 살균이 가능하였다. 행주에 오염된 E. coli에 대한 라이젠 및 농축액의 살균소독력을 비교 평가하기 위해 무처리, 물세척, 합성세제(15 ppm), 차아염소산나트륨(200 ppm)으로 처리한 결과 행주 내 잔여 균수가 각각 5.05, 4.32, 3.70, $3.02\;log_{10}cfu/g$로 나타난 반면 라이젠 2, 3배 희석액, 농축액 원액, 2배 희석액은 각각 2.30, 2.43, 0, $1.88\;log_{10}cfu/g$로 나타나 라이젠은 생균제로서 우수한 살균소독 효과를 보여주었다. 또한 행주에 오염된 S. Typhimurium을 대상으로 살균 실험을 실시한 결과 E. coli의 결과와 유사한 결과를 보여주었다. 행주 내 잔여 균수는 무처리에서 4.80, 물세척 처리에서 4.12, 합성세제 처리에서 3.58, 차아염소산나트륨 처리에서 $2.81\;log_{10}cfu/g$로 나타났다. 라이젠 2, 3배 희석액 및 농축액 2배 희석액은 2.03, 2.14, $1.59\;log_{10}cfu/g$로 나타났으며 농축액 원액은 완전 살균효과를 보여주었다. 본 연구 결과 쌀뜨물 발효액은 생균제로서 행주내 대장균, 살모넬라 등 식품위해미생물 제거를 위한 살균제로서 효과가 우수하였다.

• 분석과학
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• 제14권6호
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• pp.486-493
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• 2001

본 연구는 SIMS를 이용한 bismuth titanate 박막의 깊이방향 분석에 있어서 mesh grid를 사용한 경우와 사용하지 않은 경우, offset voltage를 사용한 경우와 사용하지 않은 경우 등 분석조건에 따른 charging effect 그리고 검출한계의 특성을 검토하고자 하였다. 결과에 따르면 -40 V의 offset voltage를 사용하였을 경우는 charging effect의 감소는 물론 검출한계도 낮출 수 있었으나 mesh grid를 사용하였을 경우에는 charging effect는 다소 줄일 수 있었으나 반면 검출 한계는 오히려 높아졌다. O- 일차이온을 적용한 경우는 -40 V의 offset voltage를 사용하였을 때와 동일한 효과를 얻을 수 있었다.