• 사물인터넷융복합논문지
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• 제8권5호
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• pp.1-9
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• 2022

최근 IoT 및 휴대용 통신 단말에 각종 서비스가 연동되면서 해당 디바이스의 보안 취약점을 악용한 사이버 공격이 급증하고 있다. 특히 지능형 지속위협(APT) 공격을 통해 대단위 네트워크 환경에서 이기종 형태의 디바이스를 대상으로 한 사이버 공격이 급증하고 있다. 따라서 침해사고 발생시 대응 체계의 유효성을 향상시키기 위해서는 위협 분석 및 탐지 성능이 향상되도록 수집된 아티팩트 데이터에 대한 데이터 보완(Data Enrichment) 메커니즘을 적용할 필요가 있다. 이에 본 연구에서는 침해사고 분석을 위해 수집된 아티팩트를 대상으로 기존의 사고관리 프레임워크에서 수행하는 데이터 보완 공통 요소를 분석하여 실제 시스템에 적용 가능한 특징 요소를 도출하고, 이를 토대로 개선된 사고분석 프레임워크 프로토타입 구조를 제시하였으며 도출된 데이터 보완 확장 요소의 적합도를 검증하였다. 이를 통해 이기종 디바이스로부터 수집된 아티팩트를 대상으로 사이버 침해사고 분석 시 탐지 성능을 향상시킬 수 있을 것으로 기대된다.

• Animal Bioscience
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• 제37권3호
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• pp.536-546
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• 2024

Objective: This experiment was conducted to investigate the effect of grain-based pecking blocks on productivity and welfare status at two commercial broiler welfare-certified farms. Methods: Production and welfare indicators were assessed at two farms (designated Farm A and B). Both farms had two windowless houses with forced tunnel-type ventilation and housed broilers at stocking densities of approximately 16.7 birds/m² (Farm A) and 16.8 birds/m² (Farm B). Each house was divided into two or three equal sections and was provided with or without pecking blocks. Grain-based pecking blocks, measuring 25 × 25 × 25 cm, were given to broilers in both farms at 1 block per 1,000 birds. Various parameters including productivity (body weight and flock uniformity), corticosterone levels (in fecal droppings and feathers), footpad dermatitis, hock burn, feather dirtiness, gait score, litter quality, body surface temperature, and volatile fatty acids in fecal samples were assessed at 26 days of age, whereas litter quality was analyzed at 13 and 26 days of age. Results: There were no significant effects of providing pecking blocks on productivity (body weight and uniformity), fecal and feather corticosterone, welfare indicators (i.e., footpad dermatitis, hock burn, feather cleanliness, and gait score), and litter quality (i.e., moisture, nitrogen, and pH). No differences in body surface temperature between the control and enrichment treatments were noted in Farm B, but body surface temperatures of the head (p = 0.029) and legs (p = 0.011) in the enrichment vs. control group were elevated in Farm A. Butyrate concentration in the enrichment vs control group was higher in Farm B (p = 0.023), but this effect was not detected in Farm A. Conclusion: It is concluded that grain-based pecking blocks did not affect performance and welfare indicators. Further studies are warranted to elucidate the potential impact of grain-based pecking blocks on gut health indicators.

• 해양환경안전학회지
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• 제22권5호
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• pp.500-507
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• 2016

본 연구는 유용 냉수성 어류 등의 종묘생산 시 초기의 성장과 생존률을 향상시키기 위하여, 저온에서 증식할 수 있는 저온 내성을 가진 로티퍼(Brachionus plicatilis)를 배양하여, 수온 및 시간에 따른 영양강화 실험을 실시하였다. 로티퍼의 저온 배양은 $20^{\circ}C$에서 배양하던 로티퍼의 수온을 점차적으로 낮추면서 활력이 있는 개체의 선별 배양을 반복하여 최종적으로 $10^{\circ}C$에서 사육하였다. 영양강화는 상업적으로 이용되는 영양강화제인 A, S, SCV 및 SCP의 4종류를 사용하여 10, 15 및 $20^{\circ}C$의 수온에서 6, 12 및 24시간 실시하였다. 수온 $10^{\circ}C$에서 50일간 로티퍼의 증식률 실험을 한 결과 접종 밀도 $350{\pm}7.9$개체/ml에서 최종 배양 밀도는 $1,064{\pm}5.7$개체/ml로 약 3배 개체수가 증가하였다. 영양강화제에 포함된 지방산을 분석한 결과, n3계 고도불포화 지방산인 eicosapentaenoic acid (EPA, C20:5n-3) 및 docosahexaenoic acid(DHA, C22:6n-3)는 SCP에서 각각 15.49%, 35.03 %로 높게 나타났다. 영양강화한 로티퍼의 지방산 조성은 영양강화제에 따라 영향을 받았다. EPA는 SCP가 영양강화 수온 및 시간에 관계없이 2 % 이상을 차지하여 다른 영양강화제보다 높은 비율을 나타냈다. DHA는 S가 $15^{\circ}C$, 24시간 실험구에서 12.40 %로 높게 나타났다. 영양강화 로티퍼의 EPA와 DHA의 비율을 고려하면 S를 $20^{\circ}C$에서 12시간 영양강화한 실험구가 각각 3.09, 11.65 %로 높게 나타났다.

• 한국약용작물학회지
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• 제7권4호
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• pp.296-302
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• 1999

인삼 조직배양에 있어 multi-shoot 대량번식을 통한 이차대사산물의 이용가능성을 조사코자 강제통기방식에 의해 $CO_2$를 기내에 공급하여 배배양하였던 바 multi-shoot 분화특성 및 사포닌 함량에 미치는 $CO_2$의 효과는 다음과 같다. 부정아 수와 부정아 유래의 신초수는 무처리와 $CO_2$ 2처리구간에 차이가 적었고 분화율은 50%내외이었고 부정아에서 분화한 신초는 경엽의 전개가 빠르고 생장량이 높은것이 특징이었다. 한 개의 자엽에서 분화되는 shoot primordium의 수는 대체로 15.4개-23.9개로 $CO_2$ 2, 500ppm처리구가 가장 양호하였고 $CO_2$ 10, 000ppm의 고농도는 오히려 shoot primordium수 뿐만 아니라 신초 분화율도 저하시켰다. 무처리의 건물율은 7,50%이었던데 반하여 $CO_2$ 2, 500ppm처리구는 건물율이 8.59%로 여타 $CO_2$ 처리구에 비하여 가장 높았다. 기내개화율은 무처리가 7.6%이었으나 $CO_2$, 2, 500-5, 000ppm처리구는 16.3-15.7%로 무처리에 비하여 2배 가량 높았다. 그러나 1개의 치상 배에서 얻어지는 개화수는 1.2-1.3개로 $CO_2$ 처리농도에 따른 차이가 없었다. 조사포닌 함량은 $CO_2$ 2, 500ppm처리구의 경우, 캘러스와 신초가 혼재되어 있는 소식물체는 5.80%이었던데 비하여 multi-shoot가 8.32%로 높았고 ginsenoside함량은 multi-shoot의 경우, ginsenosid Rd, Re 그리고$Rg_1$이 특히 많았다.

• 한국수소및신에너지학회논문집
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• 제24권3호
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• pp.242-248
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• 2013

The purpose of this study is to obtain low-emission and high-efficiency by hydrogen enriched LPG fuel in LPG engine and is to clarify the effects of hydrogen enrichment in LPG fuelled engine on exhaust emission and performance. An experimental study was carried out to obtain fundamental data for performance and emission characteristics of hydrogen enrichment in LPG engine. The research was held by changing the hydrogen ratio to 0, 5, 10, 20% in 1500rpm, bmep 2 and 4bar. The result turned out that the combustion duration was shortened due to fast flame propagation of hydrogen. And the amount of Carbon dioxide and Hydrocarbon decreased. However, the amount of NOX increased, which is thought to be the result of high adiabatic flame temperature of hydrogen. It has been confirmed that this phenomenon has changed by the Hydrogen mixing ratio.

• 환경영향평가
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• 제17권6호
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• pp.321-333
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• 2008

Considering risks and artificial enrichments of metals in the soils of the study area, the study aims to analyze geology, grain size and geochemistry. Geology is mainly composed of gneisses and phyllites of metamorphic rocks, sandstones, siltstones, shales, tuffs of sedimentary ones and granites and andesites of igneous ones in the area. In the area, mean contents of metals are not meaningful in accordance with petrogenesis. The soil textures of the area are of S, lS and sL of sandy soil, L, scL, cL of loam and C, zC and sC of clayey soil. Mean contents of Ni, Cr, Co and Cu are meaningfully high in loam and clayey soil relative to sandy soil, whereas Ni, Zn, Cd contents are higher in clayey soil than in loam. Those differences imply the metallic contents are dependent to grain size. Based on the metal contents in the soils of the study area, Cu and Zn in loams and Pb in sandy soils are corresponded to soil contamination warning standards, and As showing 75mg/kg of maximum content in loams is assigned to soil contamination countermeasure standards, respectively. Artificial enrichment factor minimized wall rock and grain size relations is over 1 in Cr, Ni and Cu, but the factor is below 1 in average of other metals.

• Mass Spectrometry Letters
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• 제3권2호
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• pp.39-42
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• 2012

Phosphorylation and glycosylation are two of the most important and widespread post-translational modifications (PTMs) in an organism. Proteomics analysis of the PTMs has been challenged by low stoichiometry of the modified proteins and suppression effects by high abundance proteins, typically no-functional house-keeping proteins. In this study, a novel method was applied for not only isolating PTM peptides from intact peptides but also concurrently characterizing of glyco- and phosphoproteome using electrostatic repulsion hydrophilic interaction chromatography (ERLIC) packed with silica coated by crosslinked polyethyleneimine. For 2 mg tryptic digest of mouse proteome of epicardial adipose tissue with fat diet, 802 N-glycosylated peptides of 316 glycoproteins and 159 phosphorylated peptides of 75 phosphoproteins were identified using HPLC chip/quadrupole time-of-flight (Q-OF) tandem mass spectrometer.

• 응용통계연구
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• 제19권2호
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• pp.291-303
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• 2006

대용량의 데이터로부터 의미있는 지식을 찾는 과정에서 데이터의 질은 무엇보다도 중요하다. 본 연구에서는 데이터의 충실도를 높이기 위한 방법으로 여러 경로로부터 수집된 데이터의 정보를 활용하기 위해 데이터 마이닝 알고리즘인 의사결정 규칙을 이용한 데이터 통합 기법을 제안하고, 실제 데이터를 이용하여 모의실험을 통해 제안된 알고리즘의 효율성을 비교하였다. 실험결과 제안된 알고리즘이 데이터 통합의 성능을 향상시킴을 알 수 있었다.

• 한국환경과학회지
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• 제21권11호
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• pp.1339-1348
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• 2012

The versatile aerosol concentration enrichment system (VACES) have proven useful for providing elevated levels of atmospheric aerosol to human and animal exposures. In this study, we describe a VACES and tests conducted to both optimize the enhancement factor (EF) and characterize how it depends on experiment conditions. Particle number concentrations were measured from upstream and downstream of the system by scanning mobility particle sizer (SMPS) with a long differential mobility analyzer (DMA) in combination with a condensation particle counter (CPC). SMPS was used for to determine VACES particle EF. Particle EF tends to increase for higher the saturator temperature ($T_{Sat}$) and lower the condenser temperature ($T_{Con}$). $T_{Con}$ higher than $0^{\circ}C$ and $T_{Sat}$ lower than $50^{\circ}C$ was the best to obtain the most increase in particle concentration. Correlation analysis of EF with factor variables of $T_{Sat}$ and $T_{Con}$ resulted in correlation 0.662 and 0.416, respectively. With all five predictor variables included in a multiple regression model, the EF had a liner correlation with $R^2=0.643$.

• 대한기계학회논문집B
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• 제28권2호
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• pp.207-214
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• 2004

The burning velocities of conventional and oxygen-enriched methane flame in various equivalence ratio were determined by experiments. The validity of existing reaction mechanisms was examined in oxygen-enriched flame on the basis of the experiment results. Modified reaction mechanism is suggested, which was able to predict burning velocity of oxygen enriched flame as well as methane-air flame. Complementary study on reaction mechanisms shows the following results : Present experiment data were found to be more reliable in comparison with existing ones in a oxygen-enrichment condition. It was found that some modification in existing reaction mechanisms is necessary, since discrepancy between measurements and predictions is increasing with oxygen enrichment ratio. The sensitivity analysis was performed to discriminate the dominantly affecting reactions on the burning velocity in various oxygen enrichment and equivalence ratio. A modified GRI 3.0 reaction mechanism based on our experiment results was suggested, in which reaction rate coefficients of (R38) H+O$_2$<=>O+OH in GRI 3.0 reaction mechanisms were corrected based on sensitivity analysis results. This mechanism showed a good agreement in predicting the burning velocity and number density of NO in oxygen-enriched flame and would provide proper reaction information of oxygen-enriched flame at this stage.