• 미생물학회지
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• 제33권3호
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• pp.193-198
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• 1997

본 연구에서는 유류로 오염된 환경을 생물학적으로 정화하는 방법의 확립을 위하여 생물계면활성제를 생산하는 세균을 유류오염지역으로부터 분리한 후, 생물계면활성제의 생산에 미치는 각종 환경요인과 분리세균의 hydrocarbon 이용능 등을 조사하였다. 유류로 오염된 해수 및 토양시료로부터 crude oil을 기질로 하여 생물계면활성제를 생산하는 172개의 균주를 순수분리하였다. 이들중에서 표면장력 감소능이 가장 우수한 SW1을 공시균주로 선정한 후, 형태학적, 배양적 및 생화학적 제반 특성을 조사하여 그 분류학적 위치를 검토한 결과 Pseudomonas속으로 판명되어, 편의상 Pseudomonas sp. SW1로 명명하였다. 각종 탄소원을 이용하여 유화활성 및 표면장력 감소능을 조사한 결과, crude oil과 n-hexadecane에서 비슷한 유화활성 및 표면장력 감소능을 나타내었다. 생물계면활성제 생산을 위한 배지 및 배양조건은 n-hexadecane 2.0%, yeast extract 0.04%, $K_{2}HPO_4$ 0.02%$KH_2PO_4$ 0.03%, $MgSO_4$ center dot $7H_2O$ 0.04%, 30^{\circ}C.$ 및 pH 7.0이었다. 상기실험에서 결정된 조건하에서 공시균을 배양한 결과, 배양 2일 후인 정지기 초기에 생물계면활성제가 가장 많이 생산되었으며, 이때 minimum surface tension은 32mN/m이었다. 또한 본 공시균은 Bunker oils, n-alkanes, branched alkanes등을 기질로 하여 생육할 수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제27권8호
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• pp.1114-1123
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• 2014

The study was designed to evaluate the effect of 2% seamustard (Undaria pinnatifida) by-product (SW) on growth performance, immunity, carcass characteristics, cholesterol content and fatty acid profile in Hanwoo steers. A total of 20 Hanwoo steers (ave. 22 months old; 619 kg body weight) were randomly assigned to control (basal diet) and 2% SW supplemented diet. Dietary SW supplementation significantly (p<0.05) improved average daily gain and gain:feed ratio as well as serum immunoglobulin G concentration. Chemical composition and quality grade of meat and carcass yield grades evaluated at the end of the trial were found to be unaffected by SW supplementation. Dietary SW significantly reduced meat cholesterol concentration (p<0.05). Dietary SW supplementation significantly reduced the myristic acid (C14:0) and palmitoleic acid (C16:ln-7) concentration, while SW increased the concentration of stearic acid (C18:0) and linolenic acid (C18:3n-3) compared to control (p<0.05). Dietary SW supplementation had no effect on saturated fatty acids (SFA), unsaturated fatty acids, poly unsaturated fatty acid (PUFA) or mono unsaturated fatty acid content in muscles. A reduced ratio of PUFA/SFA and n-6/n-3 were found in SW supplemented group (p<0.05). In conclusion, 2% SW supplementation was found to improve growth, immunity and fatty acid profile with significantly reduced cholesterol of beef.

• ETRI Journal
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• 제39권2호
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• pp.202-212
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• 2017

With the advent of the Internet-of-Things paradigm, the amount of data production has grown exponentially and the user demand for responsive consumption of data has increased significantly. Herein, we present DART, a fast and lightweight stream processing framework for the IoT environment. Because the DART framework targets a geospatially distributed environment of heterogeneous devices, the framework provides (1) an end-user tool for device registration and application authoring, (2) automatic worker node monitoring and task allocations, and (3) runtime management of user applications with fault tolerance. To maximize performance, the DART framework adopts an actor model in which applications are segmented into microtasks and assigned to an actor following a single responsibility. To prove the feasibility of the proposed framework, we implemented the DART system. We also conducted experiments to show that the system can significantly reduce computing burdens and alleviate network load by utilizing the idle resources of intermediate edge devices.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.45-50
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• 2021

코로나19가 초래한 비대면 시대에 SW교육이 자리 잡기 위해서는, 대면 및 비대면 수업방식에 따른 SW교육의 효율성에 대한 연구가 필요하다. 이에 본 연구는 2020년 전국 30개 SW 영재학급의 교육과정 운영현황을 수업 방식(대면, 비대면, 혼용)에 따라 구분하였다. 그후 계획 대비 수업시수 및 1인당 산출물 제작 결과를 양적 분석을 통해 비교·분석하였다. 연구 결과 계획한 시수 대비 가장 많은 수업을 소화한 수업의 종류는 비대면 수업(90.9%)이었으며, 다음은 대면 수업(84.2%)이었고, 가장 적은 것은 혼용 수업(80.5%)이었다. 학생 1인당 산출물 평균 개수는 대면수업(0.504개) 그룹이 가장 많았으며 혼용수업(0.421개) 그룹과 비대면수업(0.42개) 그룹은 이에 미치지 못했다. 본 연구 결과를 통해 비대면 중심의 수업을 진행한 영재학급은 가장 많은 수업시수를 확보함을 확인할 수 있었다. 하지만 비대면 수업방식에서는 영재학급의 1인당 산출물 개수가 부족했다. 즉 비대면 방식은 시수 확보에는 유리하나, 산출물을 지도하는 것을 교사나 학생들이 어려워하기 때문에 이를 해결할 수 있는 다양한 방안이 마련되어야 할 것이다.

• Journal of Animal Science and Technology
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• 제64권2호
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• pp.353-364
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• 2022

The present study aimed to assess the feasibility of increasing the slaughter weight (SW) of non-lean finishing pigs to improve their meat quality. A total of 36 (Landrace × Yorkshire) × Duroc gilts and barrows were slaughtered at 115 (Av), 125 (Hi), or 135 (XHi) kg, followed by physicochemical analyses and sensory evaluation on their longissimus dorsi (LD) and Semimembranosus (SM) muscles. Backfat thickness was greater (p < 0.05) for the XHi (31.2 mm) and Hi (29.3 mm) groups than for Av (25.0 mm). Dressing percentage and yield of the belly per whole carcass were also slightly greater for XHi and Hi vs. Av. The intramuscular fat (IMF) content of SM was greater for XHi (2.64%) than for Av (1.83%) and Hi (2.04%) and also was correlated with SW (r = 0.55). The pH value, lightness, redness, drip loss, shear force, and moisture and protein contents of LD and SM, as well as IMF content of LD, were unaffected by SW. Percentages of 14:0, 16:0, and total saturated fatty acids (FA) were less for Hi and XHi vs. Av in SM, those of total unsaturated FA, 18:2, 20:4, and n-6 being opposite; FA composition of LM was not influenced by SW except for a reduced 18:0 percentage for XHi vs. Av. The sensory score was less for XHi vs. Av for odor in fresh LD and SM, and less for Hi and XHi vs. Av for aroma in fresh LM; scores for color, drip loss, marbling, and acceptability were unaffected by SW. As for cooked muscles, none of the scores for color, aroma, flavor, juiciness, tenderness, and acceptability was affected by SW, except for a greater LD color score for Hi and XHi vs. Av. Collectively, the results suggested that the increased yield of the carcass and belly due to increased SW is outbalanced negatively by excessive backfat deposition in production efficiency, whereas the SW increase exerts little influence on overall sensory quality of fresh or cooked meat. Production of non-lean market pigs overweighing 115 kg therefore will be uneconomical unless consumers pay a substantial premium for the over-fattened pork.

• 인터넷정보학회논문지
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• 제21권1호
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• pp.57-70
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• 2020

본 연구는 Q-sort 방법론을 통해 직무행복에 관한 SW 인력의 주관적 인식을 조사하였다. 63 명의 응답자들을 분석하여 매우 차별화된 특성을 가진 4 개의 직무행복 유형들이 도출되어 '안정추구 직장생활형', '도전적 자기주도 기술지향형', '현실적 전문가추구형', '순수 기술지향 업무몰입형'으로 명명되었다. '도전적 자기주도 기술지향형'과 '순수 기술지향 업무몰입형' 유형은 최신 ICT 에 흥미를 가지고 전문성으로 인정을 받으며 자아실현 하는 것을 직무행복이라 생각한다. 반면 '안정추구 직장생활형'과 '현실적 전문가추구형'은 직무행복에서 급여와 복지혜택, 승진 등이 더 중요하며 기술자 경력경로로 성장하는 것에는 큰 관심이 없었다. 오늘날은 우수한 SW 개발인력이 경쟁력의 핵심이다. 국가와 기업은 국내 ICT 인력들의 직무행복 추구 성향과 특성에 대해 정확하게 이해함으로써 행복 증진방안을 현실감 있게 마련하여야 한다. 우리나라는 제 4유형과 같은 '순수 기술지향 업무몰입형'인력들이 부족한 만큼 SW 개발자들이 기술전문가로서 자부심과 긍지를 가지고 창의성을 발휘하며 고품질의 산출물을 생산할 수 있도록 행복한 직무 생태계를 조성해주어 4차 산업혁명 시대의 경쟁력을 확보하여야 한다.

• 생약학회지
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• 제49권4호
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• pp.305-311
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• 2018

Osteoarthritis (OA) is the most common form of joint disease, characterized by articular cartilage, osteonecrosis, and osteochondral bone erosion. It is an early, progressive disease that combines joint stiffness and joint pain and reduces cartilage function and condition. Interleukin-1 beta ($IL-1{\beta}$) is thought to be important to the pathogenesis of OA and significantly increases the expression of matrix metalloproteinases (MMPs), which play an important role in cartilage degradation in OA. Sparassis crispa (Wulf.) is an edible / medicinal mushroom that has been reported to variety of biological activities. In this study, investigated the Anti-inflammatory effect of Sparassis crispa (Wulf.) ethanol extract (SCE) on $IL-1{\beta}$ stimulated SW1353 chondrocytes. SCE decreased the expression and activity of MMPs by $IL-1{\beta}$ and decreased the levels of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) associated with the inhibition of prostaglandin E2($PGE_2$) in $IL-1{\beta}$ stimulated SW-1353 chondrocytes. In addition, SCE inhibits the expression of MAPK (mitogen-activated protein kinase) and $NF-{\kappa}B$ (nuclear factor-kappa B) signaling in $IL-1{\beta}$ stimulated SW-1353 cells, and SCE inhibits the production of reactive oxygen species (ROS) through heme oxygenase-1 (HO-1) expression. Thus, it is suggested that SCE has a potential as an anti-inflammatory agent in osteoarthritis treatments.

• 융합정보논문지
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• 제12권5호
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• pp.290-297
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• 2022

본 연구에서는 단삼 뿌리 추출물의 세포 안정성, 수렴 활성, NO 소거능, iNOS 단백질 발현량, 염증성 cytokine 분비, elastase 효소 저해능, type I pro-collagen 합성능 등을 조사하여 기능성 화장품 소재로서의 가능성을 평가하고자 하였다. 단삼 80% 에탄올추출물(SE)과 열수추출물(SW)을 대상으로 NHDF 및 RAW264.7 세포에서 0.05~0.5 mg/mL 농도 처리에 따른 독성을 보이지 않아 수렴, 염증, 주름 개선 효능을 진행하였다. 그 결과 수렴활성 측정 결과 SE는 10 mg/mL에서 74.6%의 활성을 나타냈다. SE는 농도 의존적으로 LPS에 의해 유도된 NO, iNOS 단백질, TNF-α 및 IL-6 cytokine의 생성을 유의미하게 감소시켰다. 게다가 SE와 SW는 elastase 효소 활성을 억제할 뿐만 아니라 TNF-α에 의해 감소된 pro-collagen의 생성을 증가시켰다. 따라서 단삼 에탄올추출물은 수렴제, 염증 관련 피부 질환, 주름 생성을 효과적으로 예방할 수 있는 천연 화장품 소재로서의 활용 가능성이 높을 것으로 기대된다.

• 펄프종이기술
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• 제46권3호
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• pp.81-87
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• 2014

Conditions of paper manufacturing process should be changed depending on the end use and paper properties. Most of the case, mixed pulps with long softwood fibers and short hardwood fibers are used to achieve proper qualities of product with reasonable production cost. For specialty paper manufacture the wood pulp and cotton linter pulp are usually mixed together. The objectives of this study is to analyze physical, mechanical and fracture mechanical properties of paper depending on SwBKP, HwBKP and cotton linter pulp(CLP) mixing. When the mixing ratio of SwBKP was increased, strength properties, such as tensile, tear, and folding endurance, were also increased. When the mixing ratio of SwBKP and HwBKP was increased, stress concentration index was decreased and fracture toughness was increased.

• Asian-Australasian Journal of Animal Sciences
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• 제25권11호
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• pp.1507-1510
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• 2012

Quantitative trait loci (QTL) associated with fat deposition traits in pigs are important gene positions in a chromosome that influence meat quality of pork. For QTL study, a three generation resource population was constructed from a cross between Korean native boars and Landrace sows. A total of 240 F2 animals from intercross of F1 were produced. 80 microsatellite markers covering chromosomes 1 to 10 were selected to genotype the resource population. Intervals between adjacent markers were approximately 19 cM. Linkage analysis was performed using CRIMAP software version 2.4 with a FIXED option to obtain the map distances. For QTL analysis, the public web-based software, QTL express (http://www.qtl.cap.ed.ac.uk) was used. Two significant and two suggestive QTL were identified on SSC 6, 7, and 8 as affecting body fat and IMF traits. For QTL affecting IMF, the most significant association was detected between marker sw71 and sw1881 on SSC 6, and a suggestive QTL was identified between sw268 and sw205 on SSC8. These QTL accounted for 26.58% and 12.31% of the phenotypic variance, respectively. A significant QTL affecting IMF was detected at position 105 cM between markers sw71 and sw1881 on SSC 6.