• Title/Summary/Keyword: residual time

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Color and Texture Properties of Puchukimchi Kimchi Prepared with Different Methods (담금방법을 달리한 부추김치의 색과 조직특성)

  • 박문옥;김나영;장명숙
    • Korean journal of food and cookery science
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    • v.16 no.4
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    • pp.321-327
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    • 2000
  • Puchu (Allium odorum L.) Kimchi was prepared in 5 different conditions and the color(chlorophyll and carotenoids) and textural properties were measured during fermentation up to 43 days at 10$^{\circ}C$. The 5 preparation conditions which varied depending upon the sub-ingredients were as follows: to add salt (treatment A), soybean sauce(treatment B), soybean sauce and perilla seed powder (treatment C), anchovy sauce(treatment D), and anchovy sauce and glutinous rice paste(treatment E). Residual contents of chlorophyll and carotenoid decreased with the lapse of fermentation time, especially in treatments D and E. Value“a”indicating the degree of greenness in Hunter's color value decreased with the lapse of fermentation time, especially in treatment E. The contents of total soluble pectin and total soluble solid increased during fermentation.

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Effect of Solvent Content on Morphology and Rubber Particle Size Distribution of High Impact Polystyrene (용매 함량이 내충격성 폴리스티렌의 형태구조 및 고무 입도분포에 미치는 영향)

  • 정한균;박정신;장대석;이성재
    • Polymer(Korea)
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    • v.26 no.3
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    • pp.307-315
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    • 2002
  • Major factors affecting the impact resistance of high impact polystyrene (HIPS), the rubber-toughened grade of polystyrene, are rubber-phase particle size and size distribution, molecular weight, morphology, and degree of grafting. Accordingly, it is important to control or investigate these factors. In this study, the effect of solvent content was analyzed by the morphology and particle size distribution of rubber phase, and final properties in bulk-solution polymerization of HIPS. The prepolymerization time was, first, determined by measuring the evolution of particle size distribution of dispersed phase to explain the phase inversion with time. As the solvent content increased, the size of rubber particle increased and then gradually decreased. Rubber-phase morphology was likely to have higher degree of grafting as the solvent content increased. Rheological and mechanical properties decreased as the solvent content increased because of the decrease of matrix molecular weight due to the chain transfer reaction to solvent and the existence of residual solvent. Nevertheless, the impact resistance seemed to increase when the rubber particle size increased.

Monitoring on Alcohol Fermentation Characteristics of Strawberry (딸기의 알콜 발효 특성 모니터링)

  • Lee, Jin-Man;Kim, Suk-Kyung;Lee, Gee-Dong
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.32 no.5
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    • pp.679-683
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    • 2003
  • Strawberries were fermented for their effective value added product. In alcohol fermentation of strawberries, alcohol content was maximum value (9.22% ) under the condition of 16.32$^{\circ}$Brix of initial sugar concentration, 53.03 hr of fermentation time and 28.8$^{\circ}C$ of fermentation temperature. Acetic acid content revealed minimum value (0.49%) under the condition of 13.18$^{\circ}$Brix of initial sugar concentration, 50.99 hr of fermentation time and 24.96$^{\circ}C$ of fermentation temperature. Residual sugar content revealed minimum value (3.97$^{\circ}$Brix) under the condition of 15.00$^{\circ}$Brix, 52.00 hr and 26.0$0^{\circ}C$. The optimum conditions for each alcohol fermentation were 14$^{\circ}$Brix, 50 hr and 28$^{\circ}C$.

A Study on the Cutoff time and the Malfunction Current Characteristics of RCDs (누전차단기 동작시간 및 부동작 전류 특성)

  • Han, Woon-Ki;Shong, Gil-Mok;Kim, Yong-Seok;Kim, Dong-Wook;Choi, Chung-Seog;Lee, Bok-Yong;Park, Sang-Tae
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2005.05a
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    • pp.61-65
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    • 2005
  • This paper describes the cut off time and the current characteristics of virgin RCDs and deteriorated ones in the seashore. The RCDs(Residual Current Protective Devices) are used for protecting the human body from electrical shock and for preventing facility accidents. According to the Korean standards, the RCDs are installed in panel boards. When RCDs are installed outside, they must be enclosed inside waterproof cases. In the case that RCDs are employed at temporary power sites and electrical facilities on the road they are exposed to the external environment. As a result, the RCDs deteriorated in the seashore for 3 months showed high failure rate, while the virgin RCDs all complied with Korean Standard. Considering that the RCDs are used under exposed condition outside, the reliance of RCDs must be ensured by modifying the related regulations and codes and by developing improved advanced in their performance.

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Real-Time Bandwidth Management Service for Effective Multiple Isochronous Streaming Transmission in IEEE1394 based Home Network (IEEE1394 기반 홈네트워크에서 효율적인 다중 등시성 스트리밍 전송을 위한 실시간 대역폭 관리 서비스)

  • Chae Hwa-Young;Jung Gi-Hoon;Kang Soon-Ju
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.9B
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    • pp.838-847
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    • 2006
  • In order to support multiple multimedia streaming services in home networks, many critical issues must be considered. In addition, handling the shortage of network bandwidth is one of the most significant and complicated issues. In this paper, real-time bandwidth management service is suggested as a solution to the problem regarding the IEEE1394-based home network. In order to handle the shortage of network bandwidth and to enhance the bus utilization rate, the proposed service combines two methods. First, the bus bandwidth management function determines the state of the network bandwidth and restores the residual bandwidth, which is excessively occupied by a streaming service, to the available free bandwidth. Second, the Isochronous Streaming (IS) Scheduler manages all streaming services according to priority. In order to test the proposed service, we implemented a prototype steaming management middleware and evaluated it by using the IEEE1394 network test-bed.

A Time Series Analysis for the Monthly Variation of $SO_2$ in the Certain Areas (ARIMA model에 의한 서울시 일부지역 $SO_2$ 오염도의 월변화에 대한 시계열분석)

  • Kim, Kwang-Jin;Lee, Sang-Hun;Chung, Yong
    • Journal of Korean Society for Atmospheric Environment
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    • v.4 no.2
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    • pp.72-81
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    • 1988
  • The typical ARIMA model which was developed by Box and Jenkins, was applied to the monthly $SO_2$ data collected at Seoungsoo and Oryudong in metropolitan area over five years, 1982 to 1986. To find out the changing pattern of $SO_2$ concentration, autocorrelation and partial autocorrelation analysis were undertaken. The three steps of time series model building were followed and the residual series was found to be a random white noise. The results of this study is summarized as follows. 1) The monthly $SO_2$ series was found to be a non-stationary series which which has a periodicity of 12 months. After eliminating the periodicity by differencing, the monthly $SO_2$ series became a stationary series. 2) The ARIMA seasonal model of the $SO_2$ was determined to be ARIMA $(1, 0, 0)(0, 1, 0,)_{12}$ model. 3) The model equations based on the prediction were: for Seoungsoodong: $Y_t = 0.5214Y_{t-1} + Y_{t-12} - 0.5214Y_{t-13} + a_t$ for Oryudong: $Y_t = 0.8549Y_{t-1} + Y_{t-12} - 0.8549Y_{t-13} + a_t$ 4) The validity of the model identified was checked by compairing the measured $SO_2$ values and one-month-ahead predicted values. The result of correlation and regression analysis is as follows. Seoungsoodong: $Y = 0.8710X + 0.0062 r = 0.8768$ Oryudong : $Y = 0.8758X + 0.0073 r = 0.9512$

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Study on the Detachment of Fluorescent Whitening Agents from White Waster Papers (인쇄용지 재활용을 위한 형광증백제 탈착에 대한 기초연구)

  • Lee, Ji Young;Kim, Chul Hwan;Kim, Eun Hea;Park, Tae Ung
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.48 no.2
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    • pp.5-12
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    • 2016
  • White waste papers are very important resources in the paper industry, but their use is limited because of the residual of fluorescent whitening agent (FWA). So the removal of FWAs from waste paper is an important task in the recycling process to improve the use of recycled resources. In this study, we focused on the FWAs used for surface treatments and carried out physical and chemical treatments to remove them from white waste papers. The white waste papers were disintegrated with a surfactant in different pH and temperature conditions, and then handsheets were made for the measurement of the fluorescence index, which is proportional to the amount of FWAs on papers. The effect of the flotation process on the removal of FWAs after disintegration was also investigated. The fluorescence index decreased as the disintegration time increased, but over a relatively long time, the fluorescence index increased again, which indicated the readsorption of the FWAs detached from the cellulosic fibers of the white waste papers. The lowest fluorescence index was shown when the waste papers were disintegrated with a 0.3% surfactant addition at pH 10 and at $45^{\circ}C$. However, the flotation treatment was not effective, because the flotation induced contact between the detached FWAs and the cellulosic fibers, and re-adsorption occurred.

Magnetic Field-Assisted, Nickel-Induced Crystallization of Amorphous Silicon Thin Film

  • Moon, Sunwoo;Kim, Kyeonghun;Kim, Sungmin;Jang, Jinhyeok;Lee, Seungmin;Kim, Jung-Su;Kim, Donghwan;Han, Seung-Hee
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.313-313
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    • 2013
  • For high-performance TFT (Thin film transistor), poly-crystalline semiconductor thin film with low resistivity and high hall carrier mobility is necessary. But, conventional SPC (Solid phase crystallization) process has disadvantages in fabrication such as long annealing time in high temperature or using very expensive Excimer laser. On the contrary, MIC (Metal-induced crystallization) process enables semiconductor thin film crystallization at lower temperature in short annealing time. But, it has been known that the poly-crystalline semiconductor thin film fabricated by MIC methods, has low hall mobility due to the residual metals after crystallization process. In this study, Ni metal was shallow implanted using PIII&D (Plasma Immersion Ion Implantation & Deposition) technique instead of depositing Ni layer to reduce the Ni contamination after annealing. In addition, the effect of external magnetic field during annealing was studied to enhance the amorphous silicon thin film crystallization process. Various thin film analytical techniques such as XRD (X-Ray Diffraction), Raman spectroscopy, and XPS (X-ray Photoelectron Spectroscopy), Hall mobility measurement system were used to investigate the structure and composition of silicon thin film samples.

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Orbit Determination from Tracking Data of Artificial Satellite Using the Method of Differential Correction (인공위성 추적자료의 미분보정에 의한 궤도결정)

  • 이병선;조중현;박상영;최규홍;김천휘
    • Journal of Astronomy and Space Sciences
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    • v.5 no.1
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    • pp.31-43
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    • 1988
  • The differential correction process determining osculating orbital elements as correct as possible at a given instant of time from tracking data of artificial satellite was accomplished. Preliminary orbital elements were used as an initial value of the differential correction procedure and iterated until the residual of real observation (O) and computed observation(C) was minimized. Tracking satellite was NOAA-9 or TIROS-N series. Two types of tracking data were prediction data precomputed from mean orbital elements of TBUS and real data obtained from tracking 1.70 GHz HRPT signal of NOAA-9 using 5 meter auto-track antenna in Radio Research Laboratory. Accrding to thacking data either Gause method or Herrick-Gibbs method was applied to preliminary orbit determination. In the differential correction stage we used both of the Escobal(1975)'s analytical method and numerical method using f, g series for the comparision. The results between analytical and numerical ones are nearly consistent. And the differentially corrected orbit converged to the same value in spite of the differences between preliminary orbits of each time span.

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BOTDA based water-filling and preloading test of spiral case structure

  • Cui, Heliang;Zhang, Dan;Shi, Bin;Peng, Shusheng
    • Smart Structures and Systems
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    • v.21 no.1
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    • pp.27-35
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    • 2018
  • In the water-filling and preloading test, the sensing cables were installed on the surface of steel spiral case and in the surrounding concrete to monitor the strain distribution of several cross-sections by using Brillouin Optical Time Domain Analysis (BOTDA), a kind of distributed optical fiber sensing (DOFS) technology. The average hoop strain of the spiral case was about $330{\mu}{\varepsilon}$ and $590{\mu}{\varepsilon}$ when the water-filling pressure in the spiral case was 2.6 MPa and 4.1 MPa. The difference between the measured and the calculated strain was only about $50{\mu}{\varepsilon}$. It was the first time that the stress adjustment of the spiral case was monitored by the sensing cable when the pressure was increased to 1 MPa and the residual strain of $20{\mu}{\varepsilon}$ was obtained after preloading. Meanwhile, the shrinkage of $70{\sim}100{\mu}{\varepsilon}$ of the surrounding concrete was effectively monitored during the depressurization. It is estimated that the width of the gap between the steel spiral case and the surrounding concrete was 0.51 ~ 0.75 mm. BOTDA based distributed optical fiber sensing technology can obtain continuous strain of the structure and it is more reliable than traditional point sensor. The strain distribution obtained by BOTDA provides strong support for the design and optimization of the spiral case structure.