• Food Science and Biotechnology
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• 제14권4호
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• pp.450-455
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• 2005

This study was conducted to determine firstly the composition of the essential oil from fresh changpo (Acorus calamus var. angustatus Bess) roots quantitatively and qualitatively by use of two internal standards, and secondly volatile compounds which are primarily responsible for the aroma of changpo roots. Simultaneous steam distillation and extraction method was used for essential oil extraction, and aroma extract dilution analysis (AEDA) and sniffing test by gas chromatography/olfactometry (GC/O) were used to detect the characteristic impact odorants. According to the instrumental analysis of changpo root essential oil, cis, trans-famesol (47.56 mg/kg of fresh wt), octanoic acid (23.73 mg/kg of fresh wt), trans-2-dodecenal (20.28 mg/kg of fresh wt) and trans, trans-farnesol (13.81 mg/kg of fresh wt) were the most abundant compounds. Geranyl acetate, trans-nerolidol and trans, trans-farnesyl acetate were evaluated as the characteristic impact odorants of changpo roots from results of AEDA and sniffing test. Especially, geranyl acetate was considered as the most similar odor component to changpo roots by organoleptic evaluation with GC/O.

• Ecology and Resilient Infrastructure
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• 제1권1호
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• pp.29-38
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• 2014

본 연구는 식생호안의 안정성 평가에 중요한 인자인 식생 근모량에 따른 식생호안의 전단강도와 침식특성을 분석하였다. 식생호안의 평균근모량은 자체 제작한 채취기를 이용하여 측정하였다. 본 연구에서 사용된 식생은 식생호안에서 다소 우점종인 달뿌리풀이다. 흐름 특성별 실험결과 근모량이 증가함에 따라 토양의 전단강도가 증가함을 확인하였고, 아울러 근모량의 증가에 따라 침식율은 지수함수적으로 감소함을 확인하였다. 식생토양의 전단강도가 증가함에 따라 침식율이 지수함수적으로 감소되어 근모량에 기인한 전단강도의 증가는 침식 저항능력의 증가를 가져왔다. 아울러 근모량에 따른 전단강도와 침식율의 상관분을 실시하여 높은 상관계수를 가진 식을 제시하였다. 식생을 가진 호안의 수리적 안정성에는 근모량의 증가에 의한 전단강도와 유수의 특성인 Froude수에 지배적임을 확인하였다.

• 한국소음진동공학회논문집
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• 제23권2호
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• pp.105-111
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• 2013

Whirl tower test is conducted basically during helicopter rotor system development process. And for whirl tower test of rotor hub system, new design blade or existing blade which is remodeled for new rotor hub system is used. Because of simple shape and efficient aerodynamic characteristic, BO-105 helicopter blade is used for helicopter rotor hub development project widely. Originally BO-105 blade is used for hingeless hub system and blade root is used to flexure. So flap stiffness and lag stiffness at blade root area is relatively low compare with airfoil area. So, in order to apply the BO-105 blade to bearingless hub, blade root area have to be reinforced. And in this process, blade root area's section property is changed. In this paper, we suggest reinforcement method of BO-105 blade root area and study dynamic characteristic of bearingless rotor system with reinforcement BO-105 blade.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 춘계학술발표논문집 1부
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• pp.261-264
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• 2010

Fast algorithm is proposed by using mel scale and the distribution characteristic of LSP parameters, and is to reduce the computational amount. Computational amount means the calculating times of transformation from LPC coefficients to LSP parameters. Among conventional methods, the real root method is considerably simpler than other, but neverthless, it still suffer from its indeterministic computational time. Because the root searching is processed sequentially in frequency region. In this paper, the searching interval is arranged by using mel scale but not it is uniform and searching order is arranged by the distribution characteristic of LSP parameters that is most LSP papameters are occured in specific frequency region. In experimental results, computational amount of the proposed algorithm is reduced about 48.95% in average, but the transformed LSP parameters of the proposed method were the same as those of real root method.

• 한국연초학회지
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• 제14권1호
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• pp.66-78
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• 1992

The essential oil of Korean valerian root ( Valeriana fauriei roar. dasycarpa Hara) was isolated by simultaneous distillation Sl extraction. The oil content of fresh root was 0.7% (wb) and that of dried root was 2.1 5 (db) and sensory analysis of the oil indicated sweet-balsamic, woody and floral characteristic aroma notes. The oil was fractionated into one hydrocarbon fraction and three oxygenated hydrocarbon fractions by using silica gel column chromatograpy. Each fraction was analyzed by capillary GC and GC-MS. Out of 81 characterized compounds, the major compounds were a-pinene, camphene, $\beta$-pinene, bornyl acetate, borneol , bornyl iso-valerate and sesquiphellandrene and the characteristic floral and woody aroma of neutral fraction of Korean valerian root could be due to be the presence of oxygenated compounds such as borneol, bornyl acetate, bornyl iso-valerate, p-ionone ana $\beta$-ionone epoxide. Comparing the yield of Korean valerian root with those from other origins reported, oil content of Korean valerian root was higher than those of European and Indian origins.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.622-627
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• 2012

During helicopter rotor system development process, whirl tower test is conducted basically. For conducting whirl tower test during bearingless hub development process, design new blade or using existing blade with repair or remodeling. Because simple shape and efficient aerodynamic characteristic, BO-105 blade is used for hub system development widely. Originally BO-105 blade is used for hingeless hub, ho flap stiffness and lag stiffness on blade root area is relatively low. So applying BO-105 blade to bearingless hub whirl tower test, root area have to be reinforce. In this process, blade root area's section property will be changed. In this paper, suggest reinforcement method of BO-105 blade root area and study dynamic characteristic of bearingless rotor system with reinforcement BO-105 blade.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.350-353
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• 1994

This paper presents a method to calculate the characteristic root areas and loci band of control systems with uncertainties. First, equations of boundary curves of root areas in the case of additive and multiplicative perturbation are derived. Then, an algorithm for the calculation of the array of closed curves is presented. When the upper bound of the absolute values of frequency responses for the uncertain part, is also frequency-dependent, the frequency-dependent, terms are included in the characteristic equation of the nominal system. This lead to the boundary equations of the root, areas for control systems with frequency-dependent uncertainty. Numerical examples of the control systems with multiplicative perturbations including frequency-dependent terms are presented to verify this calculation method. Finally, its applications to the design of robust control systems, e.g., passive adaptive control systems are also discussed.

• 대한본초학회지
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• 제20권4호
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• pp.33-39
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• 2005

Objectives : Because Ligusticum sinense Root as well as those of Angelica tenuissima Root are sole as Gobon(藁本) in domestic markets, morphological characteristics of them are attempted to be distinguished. Methods : The slice of the tested material made by paraffin section technique was colored with Safranine Malachite Green contrast methods, and then observed and photographed by olymphus-BHT. Results : 1. Angelica tenuissima Root has considerable number of thick roots, but Chinese Ligusticum sinense Root and Ligusticum jeholense Root are composed of rhizomes mostly with small roots. 2. Intersection of rhizomes of Angelica tenuissima Root shows a 'V'-like arrangement of xylem vessel. 3. Chinese Ligusticum sinense Root and Ligusticum jeholense Root did not show the 'V'-like arrangement, and sliced fiber bundles were found in xylem. 4. There was no difference between Chinese Ligusticum sinense Root and Ligusticum jeholense Root. Conclusions : In conclusion, Angelica tenuissima Root, Chinese Ligusticum sinense Root, and Ligusticum jeholense Root show characteristic differences in internal forms, so that it is possible to distinguish them with optical microscope.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2451-2454
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• 2003

In this paper, we propose the computation reduction methods of LSP(Line spectrum pairs) transformation that is mainly used in CELP vocoders. In order to decrease the computational time in real root method the characteristic of four proposed algorithms is as the following. First, scheme to reduce the LSP transformation time uses met scale. Developed the second scheme is the control of searching order by the distribution characteristic of LSP parameters. Third, scheme to reduce the LSP transformation time uses voice characteristics. Developed the fourth scheme is the control of searching interval and order by the distribution characteristic of LSP parameters. As a result of searching time, computational amount, transformed LSP parameters, SNR, MOS test, waveform of synthesized speech, speech, spectrogram analysis, searching time reduced about 37.5％, 46.21％, 46.3％, 51.29％ in average, computational amount is reduced about 44.76％, 49.44％, 47.03％, 57.40％. But the transformed LSP parameters of the proposed methods were the same as those of real root method.

• Korean Journal of Acupuncture
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• 제25권1호
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• pp.39-50
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• 2008

Objectives : The purpose of this study was to inquire clinical meaning and characteristic of Eight extra meridians(奇經八脈) by researching building and progression of Eight extra meridians theory. Results : As a result of research of building and progression of Eight extra meridians(奇經八脈) theory, we can regard that the origin of Eight extra meridians was based on lower Danjeon(丹田) which was the root of Primordial energy and the origin of the Twelve meridians and collaterals(十二經脈) was based on Middle energizer which was the root of Acquired energy. On this, we could know that Eight extra meridians and the Twelve meridians and collaterals are based on Primordial energy and Acquired energy and function of Eight extra meridians and the Twelve meridians and collaterals are complement each other. So, we can say that considering the Twelve meridians and collaterals means that is valued on Acquired energy clinically, and considering Eight extra meridians means that is valued on Primordial energy in health preserving method (養生).