• 제목/요약/키워드: MFB

검색결과 39건 처리시간 0.036초

산지가공 오디음료의 이화학적 특성 및 관능평가 (Physiochemical Characteristics and Sensory Evaluation of Mulberry Fruit Beverages for Rural Food Process)

  • 양향숙;노정옥
    • 동아시아식생활학회지
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    • 제22권2호
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    • pp.246-254
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    • 2012
  • The principal objectives of this study were to analyze the physiochemical properties of four mulberry fruit beverages (MFBs) and develop descriptive analysis procedures for evaluation of their sensory characteristics. Soluble solid, free sugar, pH, acidity, chromaticity, flavonoid, and anthocyanin of MFBs were determined. All MFB samples showed significantly different physicochemical properties ($p$<0.01). Ten highly trained panelists identified the following 11 sensory attributes in the MFBs and defined the terminology for each attribute : turbidity, chromaticity for appearance characteristics, berry, grass, fermented, sweet, astringent, and sour for flavor characteristics, and throat hit, refreshing, and astringent for textural characteristics. There were significant differences in the 10 sensory attributes among the MFB samples ($p$<0.001). In color, the value of MFB3 was significantly higher than those of others ($p$<0.05). In taste and overall acceptance, the values of MFB2 were significantly higher than those of others ($p$<0.01, $p$<0.001). Descriptive terminology of the developed MFBs could explain the sensory attributes of the samples according to this result. Based on this, proper analysis and sensory evaluation techniques could be applied to other fruit beverages to establish their physiochemical characteristic and descriptive sensory attributes.

재사용이 가능한 MFB로부터 Aromatic Ester가 도입된 4,4'-Di((E)-styryl)-1,1'-biphenyl의 골격을 갖는 새로운 Fluorescent Whitening Agent의 개발 연구 (Development of New Fluorescent Whitening Agent with 4,4'-Di((E)-styryl)-1,1'-biphenyl Skeleton Attached with Aromatic Ester from Recyclable Source MFB)

  • ;김석찬
    • 공업화학
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    • 제29권3호
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    • pp.303-306
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    • 2018
  • DMT 생산과정의 부산물로서 폐기 처리되어 왔던 methyl 4-formylbenzoate (MFB)를 출발 물질로 하여 고급 형광 증백제 family와 동일한 4,4'-di((E)-styryl)-1,1'-biphenyl 기본 골격을 갖고 aromatic ester가 도입된 새로운 형광 증백제(fluorescent whitening agent) 후보 물질 6종을 합성하였다. 후보 물질 6종은 MFB 및 그의 유도체와 tetraethyl biphenyl-4,4'-diylbis(methylene)diphosphonate와 Wittig-Horner 반응을 이용하여 합성하였다. 합성된 6종에 대하여 형광증백제로의 가능성을 확인하기 위하여 UV 스펙트럼을 기록하여 흡광 계수를 얻었으며, 6종 모두 전반적으로 기존 상용 제품(log ${\varepsilon}$ 4.85)과 유사한 몰 흡광 계수(log ${\varepsilon}$ 4.59~5.00)를 보여주고 있다. 특별히 화합물 디메톡시 페닐그룹을 갖는 16, 17은 기존 상용 제품보다 우수한 몰흡광 계수를 나타내고 있어 상용화를 위한 현장 테스트를 진행할 예정이다.

Lesion of Subthalamic Nucleus in Parkinsonian Rats : Effects of Dopamine $D_1$ and $D_2$ Receptor Agonists on the Neuronal Activities of the Substantia Nigra Pars Reticulata

  • Park, Yong-Sook;Jeon, Mi-Fa;Lee, Bae-Hwan;Chang, Jin-Woo
    • Journal of Korean Neurosurgical Society
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    • 제42권6호
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    • pp.455-461
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    • 2007
  • Objective : It was hypothesized that dopamine agonist administration and subthalamic nucleus (STN) lesion in the rat might have a synergistic effect on the neuronal activities of substantia nigra pars reticulata (SNpr) as observed in patients with Parkinson's disease. The effects of SKF38393 (a $D_1$ receptor agonist) and Quinpirole (a $D_2$ receptor agonist) were compared in parkinsonian rat models with 6- hydroxydopamine (6-OHDA) after STN lesion. Methods : SKF38393 and Quinpirole were consecutively injected intrastriatally. SNpr was microrecorded to ascertain the activity of the basal ganglia output structure. The effect of SKF38393 or Quinpirole injection on the firing rate and firing patterns of SNpr was investigated in medial forebrain bundle (MFB) lesioned rats and in MFB+STN lesioned rats. Results : The administration of SKF38393 decreased SNpr neuronal firing rates and the percentage of burst neurons in the MFB lesioned rats, but did not alter them in MFB+STN lesioned rats. The administration of Quinpirole significantly decreased the spontaneous firing rate in the MFB lesioned rats. However, after an additional STN lesion, it increased the percentage of burst neurons. Conclusion : This study demonstrated that dopamine agonists and STN lesion decreased the hyperactive firing rate and the percentage of burst neurons of SNpr neurons in 6-OHDA lesioned rats, respectively. Quinpirole with STN lesion increased a percentage of burst neurons. To clear the exact interactive mechanism of $D_1$ and $D_2$ agonist and the corresponding location, it should be followed a study using a nonselective dopamine agonist and $D_1$, $D_2$ selective antagonist.

고온 시편의 급랭 시 산화철 나노유체가 최소막비등점에 미치는 영향에 대한 실험적 연구 (Experimental Study on Effect of Water-based Iron(III) Oxide Nanofluid on Minimum Film Boiling Point During Quenching of Highly Heated Test Specimen)

  • 정찬석;황경섭;이치영
    • 한국안전학회지
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    • 제35권5호
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    • pp.128-136
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    • 2020
  • In the present experimental study, the effect of water-based iron(III) oxide nanofluid on the MFB(Minimum Film Boiling) point during quenching was investigated. As the highly heated test specimen, the cylindrical stainless steel rod was used, and as the test fluids, the water-based iron(III) oxide nanofluids of 0.001 and 0.01 vol% concentrations were prepared with the pure water. To examine the effect of location in the test specimen, the thermocouples were installed at the bottom and middle of wall, and center in the test specimen. Through a series of experiments, the experimental data about the influences of nanofluid concentrations, the number of repeated experiments, and locations in the test specimen on the reaching time to MFB point, MFBT(Minimum Film Boiling Temperature), and MHF(Minimum Heat Flux) were obtained. As a result, with increasing the concentration of nanofluid and the number of repeated experiments, the reaching time to MFB point was reduced, but the MFBT and MHF were increased. In addition, it was found that the effect of water-based iron(III) oxide nanofluid on the MFB point at the bottom of wall in the test specimen was observed to be greater than that at the middle of wall and center. In the present experimental ranges, as compared with the pure water, the water-based iron(III) oxide nanofluid showed that the maximum reduction of reaching time to MFB point was about 53.6%, and the maximum enhancements of MFBT and MHF were about 31.1% and 73.4%, respectively.

TWO TYPES OF ACTIVE NOISE CONTROL SYSTEM USING MFB LOUDSPEAKER

  • Nishimura, Yoshitaka;Shimada, Yasuyuki;Usagawa, Tsuyoshi;Ebata, Masanao
    • 한국음향학회:학술대회논문집
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    • 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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    • pp.764-769
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    • 1994
  • The impedance of an electro-acoustic transducer can be controlled by motional feedback, and the noise in a duct can be reduced actively by adjusting the impedance using an additional sound. In this paper, two approaches for active noise control using motional feedback (MFB) loudspeaker are described. First configuration uses an external sensor to pickup of source directly. In this configuration, the adaptation of controller is necessary to compensate the change of transfer function from noise source to control poing. The second configuration uses a new adaptive algorithm specialized for peridic noise. Because this configuration does not require any reference input and the error sensor couples very tightly with control loudspeaker, this MFB system itself is independent of the duct condition. No microphone are required in both configurations, so that a more reliable and stable active control system can be realized under severe conditions such as high pressure, high temperature, dust, flow and so on.

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Wind-induced response of a twin-tower structure

  • Xie, Jiming;Irwin, Peter A.
    • Wind and Structures
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    • 제4권6호
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    • pp.495-504
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    • 2001
  • With a newly developed multi-force-balance system(MFB), a twin-tower structure was studied for its wind-induced responses. The MFB system allowed the twin towers, which were linked structurally, to be treated as a single structural system with its corresponding modes of vibration involving coupled motions of the two towers. The towers were also studied using a more conventional force balance approach in which each tower was treated as an isolated structure, i.e., as though no structural link existed. Comparison of the results reveals how the wind loads between the towers are redistributed through the structural links and the modal couplings. The results suggest that although the structural links usually have beneficial impacts on wind-induced response, they may also play a negative role if the frequency ratios of pair modes are near 1.0.

MFB 제어 기반의 비둘기 학습제어 시스템의 설계 (A Design of MFB based Training System for Pigeon based Telemetry)

  • 도효환;김성환
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2009년도 추계학술발표대회
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    • pp.147-148
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    • 2009
  • In this paper, we describe a telemetry stimulation system that controls animal-robots. In our system, we send the main control command from PC to the controller embedded in the pigeon based animal-robots. Once the controller receives the control signal, it makes biphasic stimulation pulses to medial forebrain bundle neurons to control the pigeon behavior as we want. We design the embedded controller using CUBLOC, which is lightweight for attaching on the pigeon.

통계적 객관 분석법에 의한 레이더강우 보정 및 Vflo를 이용한 홍수모의 (Flood Simulation using Vflo and Radar Rainfall Adjustment Data by Statistical Objective Analysis)

  • 노희성;강나래;김병식;김형수
    • 한국습지학회지
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    • 제14권2호
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    • pp.243-254
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    • 2012
  • 최근 강우의 공간분포와 이동 및 발달상황을 파악할 수 있는 레이더강우 자료의 활용이 수문학분야에서 주목받고 있지만, 레이더 강우자료는 지상강우자료와 비교하여 자료의 신뢰성 확보가 되지 않아 실제 자료의 운용 및 적용에 어려움이 있다. 따라서 수문해석 분야에서는 레이더 강우를 활용하기 위해 레이더강우를 지상강우와 합성하여 보정하고 있다. 본 연구에서는 MFB(Mean-Field Bias)보정기법과 SOA(Statistical Objective Analysis)보정기법을 이용해 2010년 8월의 강우사상에 대하여 시공간 분포를 적절하게 표현할 수 있는 격자형 레이더 강우시계열자료를 생성하였다. 또한, 기존의 집중형 수문모형보다 유역내의 공간적인 유량변동을 보다 상세하게 고려할 수 있는 격자기반의 분포형모형(Vflo)을 국내 유역(낙동강권역 : 감천유역($1005km^2$))에 적용하여, 모의유출량과 관측유출량의 비교를 통해 레이더강우자료의 활용성 및 보정방법의 정확도를 평가하고자 하였다. 각 보정방법에 의한 첨두유량 오차는 20% 내외, 모델효율은 60~80% 수준으로 나타났으며, 특히 SOA방법을 통해 보정된 격자형 레이더 강우자료는 유출모형의 입력 자료로서 수문학적 활용성이 있음을 확인할 수 있었다.