• Title/Summary/Keyword: 가압 시스템

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Changes in color stability and antioxidant properties of dietary pigments after thermal processing at high pressures (고온가압 처리에 의한 식용색소의 화학안정성 및 산화방지활성 변화)

  • Oh, Boeun;Kim, Kunhee;Hong, Jungil
    • Korean Journal of Food Science and Technology
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    • v.54 no.3
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    • pp.257-263
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    • 2022
  • Various dietary pigments are added to processed foods to improve their sensory and commercial properties. In this study, autoclave sterilization (121℃ for 15 min at 15 psi) was performed on 34 food pigments, and changes in their color stability and antioxidant activity were analyzed. The autoclaving process drastically reduced the peak color intensities of water-soluble paprika and beet red (BR) by ~90%. Turmeric oleoresin (TO), water-soluble β-carotene, and grape skin color were also unstable and showed a remaining color intensity of 45-60%. The colors of all the synthetic pigments tested were stable under this process. The scavenging activities of BR and paprika against ABTS, DPPH, and AAPH radicals decreased significantly, whereas those of TO were enhanced after the autoclaving treatment. The results suggest that the chemical and bioactive properties of certain dietary pigments are affected by the autoclaving process, and this phenomenon should be considered during food processing.

압력관형 가압경수로심의 핵적 개념설계

  • 박동환;김명현
    • Proceedings of the Korean Nuclear Society Conference
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    • 1997.10a
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    • pp.158-163
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    • 1997
  • 신형 경수로심의 네가지 개념설계안을 제시하였다. 각 설계안은 압력관내에 농축우라늄 핵연료 다발을 CANDU처럼 장전하고 냉각수를 경수로 바꾼 안으로써 본 연구는 각 설계안의 장단점과 타당성을 검토하였다. 가연성 독봉인 IFBA를 사용하여 기존 CANDU 제어 시스템만으로 노심 잉여반응도의 제어가 가능함을 확인하였다.

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Developement of remote controlled treatment for the improvement of water quality (가압방식을 겸용한 소형 포터블 냉매회수 및 충전 전용기 개발)

  • Kang, Sung-Jun;Kim, Jin-Taek;Kim, Jung-Hoon
    • Proceedings of the KAIS Fall Conference
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    • 2012.05b
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    • pp.637-639
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    • 2012
  • 본 논문에서는 대형 공조기기에서 냉매의 회수시간을 단축하기 위해 진공과 가압방식을 겸용하면서 작업 시 이동이 손쉽게 소형으로 회수 및 충전이 가능할 수 있는 냉매 회수 및 충전 전용기 개발을 하고자 한다. 냉매회수시스템의 작업과정은 냉매회수 장치와 냉동기의 증발기 하부에 충진용 밸브를 호스로 연결하고 진공펌프를 운전하여 저장 탱크 내에 부착된 압력계가 진공상태가 될 때까지 액냉매를 회수 한 후, 자체적으로 증발, 흡입, 액화시켜 탱크내의 온도와 압력을 낮추어 액화된 냉매를 저장탱크로 회수하는 장치로 구성되어 있다.

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A Study on Determination of Boron Makeup Flow Rate During the Load Follow Operation (부하추종 운전시 보론 보충 수량 결정에 관한 연구)

  • Song, Yong-Mann;Lee, Un-Chul;Chung, Chang-Hyun
    • Nuclear Engineering and Technology
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    • v.20 no.1
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    • pp.1-8
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    • 1988
  • During power plant operation, the flow rate from the CVCS makeup system is estimated using the continuity equation and mass balance equation, when the primary loop boron concentration change is required due to the power transient. For this purpose, primary loop, pressurizer and VCT(volume control tank)(in CVCS) are modeled by three control volumes which contain each mass and boron concentration. Connecting pipes between primary loop, pressurizer and CVCS are also modeled by time delay. Calculation for 14-2-6-2 (power 100-50-100) load follow case (at EOL, for KNU 7) is made using these models.

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Pressure Differentials in the Elevator Lobby Depending on the Reference Pressures of the Pressurizing Dampers (급기가압 댐퍼의 설정 기준압에 따른 부속실 차압 특성 연구)

  • Park, Yong-Hwan
    • Fire Science and Engineering
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    • v.21 no.4
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    • pp.12-17
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    • 2007
  • This paper investigated pressure differentials in the elevator lobby depending on reference pressures of the pressurizing damper using FDS fire modeling. The results showed the temperatures and pressures in the contained fire room with small leak gaps can increase significantly. Setting reference pressure of the pressurizing dampers to 0 Pa can cause reduction of real pressure differentials and air velocity to resist smoke flow. This would cause smoke movement from fire room to elevator lobby which should be safe area for evacuation.

Constant Power Control of Servo Gun-type Spot Welding System (서보건형 스폿용접기의 정전력 제어)

  • Kim Jin-Woo;Kim Gyu-Sik;Won Chung-Yuen;Choi Se-Wan
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.85-88
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    • 2002
  • 저항 스폿용접은 두 개의 금속판을 서로 겹쳐서 양쪽에 전극으로 압력을 가하면서 대전류를 흘려보낼 때 재료의 접촉면의 저항에 의해 발생하는 줄울열을 이용하여 재료를 용융시켜 두 모재를 접합시키는 방법이다 산업현장의 자동 용접라인에서 로봇암의 끝단에 부착하여 사용하던 기존의 공압건은 시편에 주어지는 압력이 일정하여 실시간 가압력 변화가 어렵고, 전극벌림의 임의 조정이 불가능하였다. 본 연구에서는 서보 모터를 채용한 서보건 시스템의 실시간 가압력제어와 용접도중 일정한 파우어를 공급하는 정전력 제어방식을 이용하여 용접 품질을 향상시키고자 한다.

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Design of the Blood Pressure Measurement System Using the Inflatable Oscillometric Method (가압식 오실로메트릭 방법을 사용한 혈압측정 시스템의 설계)

  • 노동곤;이윤선;지정호;박성빈;이계형;김해관
    • Journal of Biomedical Engineering Research
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    • v.24 no.4
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    • pp.281-286
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    • 2003
  • Blood Pressure is one of the most fundamental Parameters which reflects physical conditions medically and the blood pressure measurement system using oscillometric method is a Non-Invasive Blood Pressure measurement device by measuring arterial Pressure through a cuff. In this paper. we designed a inflatable wrist blood pressure system which measures blood Pressure during the stepping inflation in the wrist cuff. The hardware system consists of a main power unit, a bladder in cuff unit, signal detection units, signal Processing units. a wireless data transmission unit, and a data display unit. We evaluated the reliability of this system by comparing and analyzing systolic. diastolic blood Pressure, and heart rate with other commercial blood Pressure measurement devices. Characteristic ratio values used to determine systolic and diastolic blood Pressure using MAA(Maximum Amplitude Algorithm) were 0.436 and 0.671 respectively.

Comparition of Submerged / Pressurized Type Membrane System by DRF and Long-Term Results in MF Drinking Water Treatment (MF막여과 정수처리에서 장기운전 결과 및 DRF를 이용한 침지식 / 가압식 시스템의 비교 평가)

  • Ha, Keum Ryul;Kim, Kwan Yeop;Kim, Hyo-Sang;Lee, Yong Soo;Song, June Sup;Kim, Chung Hwan;Yeom, Ick Tae;Lee, Yong Hoon;Kim, Hyung Soo
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.79-86
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    • 2008
  • In Korea, most of the drinking water treatment relied upon the availability of the surface water, of which the raw water quality varied significantly by season and location. Therefore, the comparison of two operation modes (Pressurized type and Submerged type membrane system) must be estimated before the long-term establishment of two systems. In this study, two pilot-scale microfiltration systems with the capacity of $50m^3/day$ were installed and operated in two different modes, and the applicability of the system was determined based on the results such as the TMP (Trans-Membrane Pressure) and flux. For quantitatively comparing the two systems, a new concept, DRF (Differential Resistance Fraction) was introduced. The accumulated sum of the permeate after each cycle of chemical cleaning was also used as a tool for the system comparison.