• Title/Summary/Keyword: 반고체상태

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A Study on the Uniform Metal-Droplet Deposition Using Laser (레이저를 이용한 균일 금속액적 적층에 관한 연구)

  • 유성복;김용욱;양영수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.667-670
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    • 2002
  • Uniform metal-droplet deposition using laser is analyzed. Using the variation principle and modeling the semi-solid phase as a non-Netwonian slurry, this model can greatly save the computational expenses that conventional numerical procedures have suffered from. The simulation results revealed that the developed model could reasonably describe the collision behavior of molten metal with solid surface. Simulations were made with variation of the falling distance and time.

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Method for Measurement of Complex Relative Permittivity of Semi-Solid Materials Using Novel Cavity Resonator Design (캐비티 공진기를 이용한 반고체 상태 물질의 복소 비유전율 측정 방법)

  • Park, Rae-Seoung;Jang, Jihyun;Park, Byungdeok;Kim, Junhwan;Park, Sangbok;Chung, Young-Seek;Cheon, Changyul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.8
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    • pp.872-878
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    • 2014
  • This paper proposes a measurement method of the complex relative permittivity of semi-solid materials using a new cavity structure. Semi-solid materials are positioned in the proposed cavity where an aperture exists on each corner of the upper part and a ground plane is separated. In order to show the validation of the proposed method, we measured the complex relative permittivity of distilled water and 0.9 % saline by sensing a shift of resonant frequency and using Critical-Points Method, and compared the results with those derived from the Cole-Cole equation.

Effect of BA Concentrations and Culture Methods on in Vitro Plant Multiplication from Shoot-Tip Culture of Wasabia japonica (고추냉이 정단배양에 있어서 BA 농도 및 배양방법에 따른 기내증식 효과)

  • Park, Yun-Young;Cho, Moon-Soo;Lee, Young-Deuk;Chung, Jong-Bae;Park, Shin;Jeong, Byeong-Ryong;Park, Sang-Gyu
    • Journal of Plant Biotechnology
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    • v.34 no.1
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    • pp.1-6
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    • 2007
  • Effect of BA concentrations and culture methods on in vitro plant multiplication from shoot-tip cultures of Wasabia japonica was studied. Shoot-tips with leaf primordia and apical meristem were cultured on MS basal medium for all the experiments. Liquid medium for 2 weeks followed by semi-solid medium for 4 weeks containing 1.0 mg/L BA was the best to number of shoots (22.8) and shoot length (3.5 cm). Shoots proliferated could be divided into ca. 5 to 11 of cultures for the multiplication of plantlets. Divided plantlets showed root formation (90%) well onto MS basal medium without growth regulators like IBA and NAA. After rooting, all the plantlets transferred into the pots containing composed soil (bio-media Co., peatmoss $8{\sim}10%$, coir dust $66{\sim}70%$, zeolite $13{\sim}17%$, vermiculite $3{\sim}7%$, perlite $2{\sim}4%$) and grown well into whole plants with multiple shoots.

Implementation of Composited Fuel Heater and Test Chamber for Diesel Cars (디젤 차량용 통합 연료히터와 시험챔버 구현)

  • Yoon, Dal-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.5
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    • pp.2375-2380
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    • 2013
  • In this paper, we have implemented the unified fuel heater and performance evaluation system for diesel cars. In order to strengthen an engine starting of diesel car, we need to assembly the fuel filter and heater. Especially, this assembly fuel heater is very important in winter, it is necessary for heating to operate the diesel engine. The heater for unifying the sensor and heater body can advance the performance of car and reduce the production cost. Finally, the performance test chamber is needed to evaluate the performance of heater.

Data Monitoring System for Activation Analysis Based on Fuel Heater of Diesel Cars (디젤차량용 연료히터의 활성화분석용 데이터 모니터링 장치)

  • Lee, Bo-Hee;Son, Byong-Min;Zhao, Xiang;Yoon, Dal-Hwan
    • Journal of IKEEE
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    • v.18 no.2
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    • pp.179-184
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    • 2014
  • In this paper, we have developed a data monitoring system for activation analysis based on fuel heater of diesel cars. The light oil of diesel engine below a constant temperature be changed to the waxing materials of a semisolid status like a paraffin, and then it may not start. In order to evaluate an engine activation performance, we suggest an engine start time with an change between an extremely low temperature and high temperature, a delay time goes with heater resistor and current and pressure. So, we have developed sensor module system that can obtain the operational status data between fuel line and fuel heater, and evaluate the performance of fuel heater through monitoring of a temperature and pressure. Finally, we can gather the temperature and pressure data of this system with mobile terminal, remotely and propose an utility of this system that can find problems of fuel heater through measured data.

Implementation of Electrical Performance Test Evaluation System for Car Fuel Heater (차량 연료히터의 전기적 성능시험 평가 시스템 구현)

  • Yoon, Dal-Hwan
    • Journal of IKEEE
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    • v.17 no.1
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    • pp.63-70
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    • 2013
  • In this paper, we have implemented the performance evaluation system of the unified fuel heater for CRDI diesel engine. If the diesel engine be cold by low temperature in winter, then that makes the waxing materials like a paraffin and is the source of poor engine starting. The unified fuel heater is the barrow meter that estimate the start performance of diesel engine, and be tested by test chamber. The chamber perform the normal temperature, an extremely low temperature, an operating performance in an extremely high temperature, the resistance operation delay time and current operation delay time in setting up test resistance, the bimetal delay time test in temperature variation, the current and resistor test of the composited heater, a heating operation test.

Analyzing System of Fuel Filter Based on Temperature and Pressure Measurement for Diesel Cars (온도 및 압력 측정에 기반을 둔 디젤 차량의 연료필터 분석 시스템)

  • Jang, Young-Sung;Lee, Bo-Hee;Yoon, Dal-Hwan;Kim, Jin-Geol;Son, Byeong-Min
    • Journal of IKEEE
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    • v.18 no.3
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    • pp.383-391
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    • 2014
  • In this paper, temperature, pressure and flow analysis system for testing a fuel filter of a diesel engine at the low-temperature environment in winter, is proposed. The light oil of diesel engine below a specific temperature is changed to the waxing materials like paraffin, and it prevents engine to start easily because of reducing fluidity. Thus, built-in block heater should be installed with fuel filter in order to solve this problem. And it is necessary to design evaluation system that can analyze the performance according to temperature, pressure and flow characteristics near fuel filter at a very low temperature. In this paper, we measured a physical quantity related to the performance of around the fuel filter using the proposed system, and analyzed their characteristics. Also the measured data is transferred to remote user by using a web server of embedded systems, and analyzed their conditions in remote place via web browser in order to know the operating status of fuel filter. We installed the proposed system in a small test chamber to verify the performance and took an experiment in normal temperature and very low temperature, and could obtain temperature, pressure and flow of near the fuel filter. As a result, the fuel flow could be improved during operation of the fuel heater.

Effects of Various Polysaccharides on the Physicochemical Properties of the Dextran Culture Containing Carrot Juice Residue Obtained from Submerged Culture Using Leuconostoc citreum S5 (다당류 첨가에 따른 당근박 함유 Leuconostoc citreum S5 발효물의 물성변화)

  • Son, Min-Jung;Lee, Sam-Pin
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.38 no.3
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    • pp.352-358
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    • 2009
  • The physicochemical properties of dextran culture fermented by Leuconostoc citreum S5 were evaluated by the addition of various polysaccharides and heat-treatment. The consistency of dextran culture increased with the addition of carrot juice residue (CJR) in submerged culture, resulting in the highest consistency of 150 $Pa{\cdot}s^n$ and viable cell counts of $2.36{\times}10^9$ CFU/mL at 20% level of CJR. The dextran culture showed the pseudoplastic behavior and its consistency was greatly increased with the addition of various polysaccharides at 2% level. Addition of glucomannan indicated the highest consistency of 1275 $Pa{\cdot}s^n$ and their heat-treatment resulted in the increase of consistency except for glucomannan. After heat-treatment, the fermented dextran culture containing CJR fortified with gellan gum and carrageenan showed great change in rheology, indicating the highest consistency and hardness value resulted in the great increase of elastic and viscous moduli. The dynamic viscoelastic properties of dextran culture were greatly increased by the heat-treatment after fortification of various polysaccharides. Thus, the consistency and viable cell counts of dextran culture were increased with the addition of CJR. The rheological properties of dextran culture were manipulated by the fortification of various polysaccharides and heat-treatment.