• Title/Summary/Keyword: uhp

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Seismic retrofitting and fragility for damaged RC beam-column joints using UHP-HFRC

  • Trishna, Choudhury;Prem P., Bansal
    • Earthquakes and Structures
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    • v.23 no.5
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    • pp.463-472
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    • 2022
  • Reinforced concrete (RC) beam column joints (BCJ) have mostly exhibited poor seismic performance during several past earthquakes, typically due to the poor-quality concrete or lack of reinforcement detailing typical of pre-code design practice. The present study is motivated towards numerical simulation and seismic fragility assessment of one such RC-BCJ. The BCJ is loaded to failure and strengthened using Ultra High Performance-Hybrid Fiber Reinforced Concrete (UHP-HFRC) jacketing. The strengthening is performed for four different BCJ specimens, each representing an intermediate damage state before collapse. viz., slight, moderate, severe, and collapse. From the numerical simulation of all the BCJ specimens, an attempt is made to correlate different modelling and design parameters of the BC joint with respect to the damage states. In addition, seismic fragility analysis of the original as well as the retrofitted damaged BCJ specimens show the relative enhancement achieved in each case.

A Study on Sample Preparation for the Analysis of Trace Elements in Foods of Animal Origin by Ultra High Pressure Microwave Digestion (초고압초음파분해법을 이용한 축산물내 미량금속 잔류분석을 위한 시료전처리 방법)

  • Lee, Myoung-heon;Lee, Hee-su;Son, Seong-wan;Jung, Gab-soo;Park, Jong-myung;Kim, Sang-keun
    • Korean Journal of Veterinary Research
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    • v.43 no.3
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    • pp.393-398
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    • 2003
  • Simple and rapid sample preparation method for trace elements in foods of animal origin using ultra high pressure microwave digestion system (UHP/MDS) and inductively coupled plasma atomic emission spectrometer (ICP/AES) were developed. 1. For the digestion of sample using UHP-MDS, 20% nitric acid (v/v) was the most suitable solvent for the determination of trace elements in foods of animal origin. 2. The optimal digestion conditions for UHP-MDS were as follows: final temperature $180^{\circ}C$, final pressure 400 PSI, and magnetic power 900 W in the solid sample. For the liquid sample final temperature $170^{\circ}C$, final pressure 300 PSI and magnetic power 700 W were optimal conditions. 3. As result of interlaboratory test, the average recovery rate of the for solid sample were 88.3~99.1% for As, 82.4~93.3% for Cd, 89.2~101.2% for Hg and 86.5~93.8% for Pb, respectively. In liquid sample, it were 87.0~96.8% for As, 80.9~96.6% for Cd, 87.5~91.2% for Hg and 91.4~95.5% for Pb, respectively. 4. The average coefficient variation rate were 3.3~15.9% for solid sample and 2.9~10.8% for liquid sample.

Textural Characteristics and Bacterial Reduction in Glutinous Rice and Brown Rice Pretreated with Ultra-High Pressure (초고압 전처리한 찹쌀과 현미의 텍스처 특성과 세균 저감 효과)

  • Cheon, HeeSoon;Lim, Taehwan;Cho, Won-Il;Hwang, Keum Taek
    • Korean Journal of Food Science and Technology
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    • v.48 no.1
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    • pp.92-95
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    • 2016
  • Ultra-high pressure (UHP) was applied to glutinous rice (Dongjin) and brown rice (Shindongjin) to determine its effects on the textural characteristics of cooked rice and bacterial reduction in uncooked rice. Hardness and stickiness of the cooked glutinous and brown rice pretreated with 500 MPa for 5 min were significantly attenuated compared to that of the control rice (p<0.05). After the UHP treatment, particles of the glutinous and brown rice were observed to be finer when cross sections of the rice were analyzed using field emission scanning electron microscope. The total bacterial count in the brown rice treated with 600 MPa for 5 min was reduced from $10^7CFU/g$ to $10^4CFU/g$, while the number of thermoduric bacteria in the brown rice was not significantly different after the UHP treatment. These results suggest that UHP may be an effective method for improving texture of dried rice and to reduce bacterial count in raw rice.

국내 타이어ㆍ튜브산업의 05년 실적 및 06년 전망

  • Korea Tire Manufacturers Association
    • The tire
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    • s.226
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    • pp.22-25
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    • 2006
  • 05년도 자동차타이어 생산량은 전년대비 6.4%증가한 8,153만개를 기록했으며, 04년과 대비하여 증가율은 둔화되었으나 신장세는 지속되고 있다. 이와 같은 지속적인 생산 증가는 국내외 고부가가치제품인 UHP타이어 제품에 대한 수요 증가와 그에 따른 생산시설이 확충되고 있기 때문으로 분석된다.

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Analysis for Internal Flow of Tube on the Self Inflating Tire Using the FSI Method (FSI 기법을 이용한 Self Inflating Tire의 펌핑 튜브 내부 유동 해석)

  • Kim, Myeongjun;Seong, Inchul;Hwang, Inkyeong;Park, Taewon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.6
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    • pp.660-667
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    • 2016
  • Maintaining proper tire air pressure is an essential element in ensuring vehicle safety. UHP Tires that boast of many safety features are increasing in the market. In particular, the development of "Self-Inflating Tire" technology is accelerating around the globe. Self-inflating tire refers to a technique for maintaining appropriate tire pressure. An internal regulator senses when tire inflation pressure has dropped below the set air pressure. The tire boosts air through the valve when rolling and compressed air enters into the tire. This procedure keeps the tire air pressure at an appropriate level and increases tire safety. Flow analysis of the internal tube is required to examine self-inflating tires. In this study, a method of tube flow analysis using the FSI Method is proposed. The valve system is also implemented to optimize the regulator and sensor.

Effects of Three Korean White Ginseng Extracts on Atopic Dermatitis-Related Cytokines, and Antioxidant and Anti-aging Activities (백삼 추출물이 아토피 피부염 관련 사이토카인 분비 및 항산화, 항노화에 미치는 영향)

  • Hong, Chang-Eui;Lyu, Su-Yun
    • Korean Journal of Pharmacognosy
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    • v.50 no.2
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    • pp.102-111
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    • 2019
  • Inflammation that is considered to be mainly related to pathogenesis of atopic dermatitis (AD) is the biological response of a host to stimuli, such as cellular injury or infection. In this study, we investigated the anti-inflammatory and anti-oxidative activities of white ginseng roots by ultra high pressure extraction (Gin-UHP), fermentation followed by ultra high pressure extraction (Gin-UHPF), and polyol extraction (Gin-POL). As a result, ginseng extracts were able to decrease the secretion of pro-inflammatory cytokines (interleukin-8 and tumor necrosis factor-alpha) and immunoglobulin E. Also, Gin-POL had the highest DPPH radical scavenging activity and when we compared the SOD-like activity, Gin-UHP had the highest. Moreover, we looked into the effect of these ginseng extracts on anti-aging to show the possible usefulness as a raw material of cosmetics. As a result, ginseng extracts were able to reduce the production of melanin, and inhibit the tyrosinase and elastase activities in a dose-dependent manner. The extracts also decreased the expression of MMP-1 and had a significant hyaluronidase inhibitory activity. Taken together, these results demonstrate that ginseng extracts may have an improvement effect on AD by using its anti-inflammatory and antioxidant properties.

Changes of the Electromyographic Activity by Head Posture and Cervical Spine Shape (두부자세와 경추형태에 따른 근활성의 변화에 관한 연구)

  • Ho-Chun Hwang;Kyung-Soo Han;Chan Jung
    • Journal of Oral Medicine and Pain
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    • v.21 no.2
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    • pp.393-405
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    • 1996
  • This study was performed to investigate the effects of changes of head posture and cervical spine shape on the mandibular resting or clenching electromyographic(EMG) activity in anterior temporalis(TA), masseter(MM), sternocleidomastoid muscle(SCM) and trapezius insertion(TI). 30 patients with Temporomandibular Disorders(TMDs) participated in this study. EMG activity($\mu$V) at rest and clenching was observed in four head postures, namely natural head posture(NHP), forward head posture(FHP), upward head posture(UHP), and downward head posture(DHP). For taking in upward or downward head posture head was inclined 10$^{\circ}$ upward or downward and CROM$^\textregistered$(cervical-range-of motion, Performance attainment Inc., USA) was used to maintain same posture during the procedure, and BioEMG$^\textregistered$ (Bioelectromyograph, Bioresearch Inc., USA) was used to record EMG activity in the above four muscles at eight locations on both sides. The recorded EMG activity($\mu\textrm{V}$) were compared and analyzed by cervical spine shape such as the head position from plum line, cervical curvature, and cervical inclination. Head position from plum line was measured in vertical plate calibrated with cm scale, comical curvature by radius was measured with adjustable curved ruler, and cervical inclination by cervical vertebrae tangent(CVT)was measured in lateral cephalograph. The results obtained were as follows : 1. Mean value of head position from plum line, cervical curvature, and cervical inclination were 4.8cm, 26.7cm, and 86.6$^{\circ}$, respectively, And There were no correlationship among these items. 2. For resting EMG activity by head posture, the value in anterior temporalis was higher at FHP than at DHP, the value in masseter was higher at FHP than at NHP, and DHP, the value in sternocleidomastoid muscle was higher at UHP than at NHP, and the value in trapezius insertion was higher at FHP and DHP than, NHP and UHP. The clenching EMG activity, however, did not show any difference by head posture. 3. Comparison of resting and clenching EMG activity between higher and lower groups by head position from plum line, cervical curvature, and cervical inclination did not show any significant difference. From this result, the author concluded that the cervical spine shape had not significantly affected to EMG activity in usual patients with TMDs.

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DPR System for Projection Displays - Today and Tomorrow

  • Li, Kenneth
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.667-669
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    • 2008
  • With the advancements or LEDs and lasers in projection display applications, arc lamps still provide the most cost effective solution to high brightness display systems. When will arc lamps become obsolete, will be of great importance today and tomorrow? Given the fact that traditional elliptical and parabolic reflectors had been around for decades; Wavien's new dual paraboloid reflector (DPR) technology with its unique imaging property enhances various aspects of the arc lamp performance will shed some light to this question. In this talk, various applications that are feasible today and anticipated needs of tomorrow will be presented.

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New Structure to Enhance the Light Efficiency in LCoS Optical Engine

  • Huang, Chi-Wei;Mo, Chi-Neng;Wu, Shih-Min
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.744-747
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    • 2005
  • The exploitable efficiency of UHP is very important in a projection system. We always use lens array for light shaping and energy distribution transformation in conventional projection system. Because of the limitation of arc gap and F/# of elements, the utilize efficiency is always dismal. In this paper we try to bring out a new method to reduce the sparkle formed on the PS converter and enhance the system efficiency.

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Optimization the UHP lamp flicker effect

  • Lin, Chia-Jin;Ho, Ming-Tsung;Chen, Hun-Wei;Liu, Chia-Lin;Mo, Chi-Neng
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.314-316
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    • 2005
  • Light flicker is a notorious phenomenon influencing light quality. The flicker of the light flux outputs from the light sources perceived by human eyes depends upon the lamp brightness fluctuations for projector display. This paper describes a ballast ignition control system, which makes the lamp strike frequency phase lock the blanking time period to minimize the flicker effect

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