• Journal of Practical Agriculture & Fisheries Research
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• v.23 no.1
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• pp.5-12
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• 2021

In order to extract the essential oil contained in the Elsholtzia splendense Nakai, a fully-bloomed individual was collected and the living body was used for the experiment. Plants were divided into 0.7kg of flowers and 1.5kg of leaves + stems, and extracted by parts and used for scent pattern analysis, and extracted after adding 5kg of outpost for the analysis of essential oil components. Essential oil extraction was performed using the SDE method improved by Schultz et al. (1977), and the extraction time was limited to 1 hour after the material started boiling. The extracted essential oil component was analyzed for fragrance pattern analysis using an e-nose, and the results of analyzing the substance of the essential oil component by GC-MS are as follows. 1. As for the fragrance pattern analysis, in the case of essential oils extracted from flowers, the scent quality was the best at 10-20 minutes, and the scents extracted from stems and leaves were somewhat of poor scent quality, but the fragrance was good at 10-40 minutes. The intensity of scent was the strongest in 10-20 minutes, and the intensity of incense was high even in 30-40 minutes. The scent extracted from the stems and leaves was generally not strong, but appeared high in 10 to 20 minutes. 2. There were 40 kinds of essential oils contained in Elsholtzia splendense Nakai oil. Among them, Mequinol, Benzene, 1,2,3,4-tetramethyl, Elsholtziaketone, and Dehydroelsholtziaketone were identified.

• Journal of Korea Soil Environment Society
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• v.4 no.3
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• pp.95-104
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• 1999

Comparative biodegradation studies of liquid and solid alkanes and of two different solid alkanes were conducted by an isolated Acinetobacter sp., which degraded crude oil alkanes simultaneously. for the determination of degradation mechanism of hydrophobic crude oil constituents. Also a model oil experimental system composed of a solid alkane. heneicosane, as a substrate and a non-degradable non-aqueous phase liquid. pristane, as an oil matrix was established and studied. It was proposed that the Acinefobacter sp. utilized hydrophobic substrates directly on the surface of them with no difference in the degradation rates between the liquid and solid alkanes. On the basis of the results from the heneicosane/pristane system which imitates crude oil matrix containing solid constituents. the crude oil matrix was considered to reduce the bioavailability of contained substrates by reducing the specific surface area of substrates to contact with microorganisms.

• Korean Journal of Food Science and Technology
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• v.30 no.6
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• pp.1345-1349
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• 1998

The flavor constituents and functionality of small kingfish were studied as affected by two stage enzyme hydrolysis (TSEH). Total free amino acid contents in water extract, autolytic extract and TSEH of small kingfish were 541.3 mg%, 8,245.3 mg% and 6,636.6 mg%, respectively. Major free amino acids in TSEH were hydroxyproline, glutamic acid, proline, leucine, phenylalanine, lysine, arginine. As for nucleotides and other bases, IMP, TMAO and total creatinine were principal components in TSEH. And the major inorganic ions in TSEH were Na, K, P, Cl and $PO_{4}$. Also TSEH of small kingfish revealed very higher Angiotensin-I converting enzyme inhibition effect than those of water and autolytic extract.

• Food Science and Preservation
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• v.12 no.2
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• pp.166-172
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• 2005

Response surface methodology (RSM) was applied to monitor the effects of steaming and roasting conditions of Polygonatum odoratum roots an total phenolics content, electron donating ability (EDA) and nitrite-scavenging ability (NSA) of the extract. In steaming and roasting processes based on the central composite design. with variations in steaming time $(60\~180\;min)$, roasting temperature $(110\~150\;min)$ and roasting time $(10\~50\;min)$, coefficients of determinations $(R^2)$ were 0.9356 (p<0.01) in total phenolics, 0.9578 (p<0.01) in EDA and 0.9436 (p<0.01) in NSA (pH 3.0). The maximum value of total phenolics was $2847.67\;mg\%$ at 135.59 min of steaming time, $143.84^{\circ}C$ of roasting temperature and 43.47 min of roasting time. The maximum value of EDA was $75.00\%$ in 108.98 min, $135.56^{\circ}C$ and 48.86 min. The maximum value of NSA (pH 3.0) was $87.38\%$ in 162.80 min, $143.88^{\circ}C$ and 31.97 min, respectively. Total phenolics content of the extract was influenced by heating conditions in the order of roasting temperature, steaming time and roasting time. While EDA and NSA were appreciably influenced by roasting time, followed by roasting temperature and steaming time.

• Proceedings of the KOSOMBE Conference
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• v.1992 no.11
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• pp.22-25
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• 1992

Lipid component and water component image in living organism can be acquired due to its chemical shift difference. Various techniques for chemical shift imaging were used for acquiring separated image. It is necessary two imaging experiments to acquire two separated images wi th Dixon's method. This technique is less susceptible to local magnetic inhomogeneities and easily applied to multi-slice imaging. With CHESS and SECSI method, which based on chemical selectivity of R.F pusle, either water or lipid image can be acquired by one imaging experiment. However, those are more susceptible to local magnetic field inhomogeneities and difficult to apply to multi-slice imaging. The SECSI method showed best signal suppression ratio of fat and water, which is measure of separation of water and fat.

• Korean Journal of Remote Sensing
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• v.26 no.1
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• pp.1-7
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• 2010

This paper proposes a new decomposition technique for polarimetric synthetic aperture radar (SAR) images. This new decomposition technique is based on the degree of polarization (DoP) and co-polarized phase-difference (CPD) of the measured polarimetric backscattering coefficients. This decomposition technique is compared with the existing three- and four-component decomposition techniques with the ALOS PALSAR full polarimetric L-band data acquired in 2009. It is shown that the new decomposition technique is better or comparable to the existing techniques for the study areas such as sea, bare soil, forest, and urban area.

• The Korean Journal of Applied Statistics
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• v.27 no.3
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• pp.431-444
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• 2014

We introduce the empirical model decomposition (EMD) to decompose a time series into a set of components in the time-frequency domain. By using EMD, we also extract cycle and trend components from major Korean macroeconomic indices and forecast the indices with the components combined. In order to evaluate their efficiencies, we investigate volatility, autocorrelation, persistence, Granger causality, nonstationarity, and forecasting performance. They are then compared with those by Hodrick-Prescott filter which is the most commonly used method.

• Journal of Technologic Dentistry
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• v.39 no.4
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• pp.253-259
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• 2017

목적: 이 실험의 목적은 한국 백삼과 캐나다 백삼의 일반 성분 분석, 항산화력 측정 및 치아 우식 유발균에 미치는 항균 효과를 비교 분석하는데 있다. 방법: 한국 백삼과 캐나다 백삼의 일반 성분은 수분정량, 조지방, 조단백질, 그리고 조회분의 분야에서 측정되었다. 두 백삼을 60% 에탄올에 추출시켜 환원당과 DPPH-scavenging assay를 통해 항산화력을 측정했다. 동일 추출물을 이용, 치아 우식균인 streptococcus mutans에 대해 디스크 확산법과 최소저해농도 측정을 실시해 항균력을 측정 및 비교했다. 결과: 실험 결과, 한국 백삼과 캐나다 백삼은 유사한 조지방, 조단백질, 조회분 성분을 갖고 있었으나 수분정량에서 캐나다백삼이 우세했다. 항산화력 실험에서는 캐나다 백삼이 DPPH- scavenging 능력에서 더 높았으나 환원당 실험과 총 페놀 함량에서는 한국 백삼의 수치가 더 높았다. 디스크 확산법을 통한 항균력 실험에서는 한국 백삼이 캐나다 백삼보다 더 넓은 clearing zone을 형성하고 더 낮은 최소저해농도를 달성해 항균력에서 우세했다. 결론: 한국 백삼과 캐나다 백삼은 비슷한 일반성분과 항산화력을 가졌다. 하지만 한국백삼이 치아 우식 유발균인 streptococcus mutans에 대한 항균력에서 더 우세했다.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2006.05a
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• pp.105-109
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• 2006

본 연구는 Karr column을 이용하여 희토류 염화물 수용액상에서 비희토성분인 철의 분리에 대한 기초 연구로서, 아민계 추출제인 Alamine336을 이용하여 염화물 수용액상에서 유기상의 농도, 염소이온 농도, 염산 농도에 따른 철 성분의 분리특성을 파악 하였다. Batch 실험결과 추출제 농도가 증가함에 따라 철성분 제거율이 급격히 상승하였으며, 염산 및 염소이온 농도의 경우도 유사한 결과를 나타내었다. Batch 실험을통해 확인된 불순물(Fe)을 추출하기위한 최적 조건은 염산농도 2M, 추출제 농도 0.1M, 상비 1, 추출시간 30분으로서, 이때 희토류 염화물 수용액상의 철 성분 함량은 0.7ppm 이하로서 제거율은 99.9%였다. 또한 최적의 batch 실험조건에서 반응시간(=체류시간)을 변화시키며 실험한 결과, 반응시간 60분의 조건에서 batch 실험과 유사한 결과를 얻을 수 있었다.

• Journal of Animal Environmental Science
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• v.9 no.1
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• pp.35-44
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• 2003

This study was conducted to determine effects of and a proper level of barley malt sprouts(BMS) addition as well as to develop an effective fermentation method when broiler litter(BL) was ensiled or deepstacked with 0 to 10% levels of BMS. Mixtures were ensiled or deepstacked for one month and physico-chemical analyses were made between before and after treatments. Addition of BMS up to 10% enhanced nutritional quality of either of ensiled or deepstacked BL mixtures. Especially, the quantity and quality of protein were improved with the addition of BMS to BL. However, the still high pH values after ensiling of various mixtures indicated that anaerobic fermentation did not effectively occur with the addition of up to 10% of BMS to BL and consideration of fermentation aids appeared to be necessary. For deepstacking, addition of BMS to BL increased internal peak temperature(from 56 to $70^{\circ}C$) of the stack, indicating that the added BMS to BL stimulated the degradative activity of fermentative microorganisms. The deepstacking method was more effective than the ensiling method for the manufacture of hygienical fred mixture with BL and BMS.