• 제목/요약/키워드: on-state resistance

검색결과 1,161건 처리시간 0.029초

응력이력이 사질토의 CPT-DMT 상관관계에 미치는 영향 (Effect of Stress History on CPT-DMT Correlations in Granular Soil)

  • 이문주;최성근;김민태;이주형;이우진
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2010년도 춘계 학술발표회
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    • pp.730-739
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    • 2010
  • Stress history increases in penetration resistance due to the increase in residual horizontal stress of granular soil. This study analyzes the effect of stress history on the results of CPT and DMT from calibration chamber specimen in OC as well as NC state. Test results show that the normalized cone resistance by mean effective stress correlates well with the relative density and the state parameter, whereas the normalized cone resistance with regard to vertical effective stress is a little affected by stress history. The horizontal stress index($K_D$) in DMT more reflects the influence of stress history on granular soil than the dilatometer modulus($E_D$) and cone resistance($q_c$). The $K_D/K_0$, in which the effect of stress history on $K_D$ is compensated by the at-rest coefficient of earth pressure, $K_0$, is related to relative density, state parameter and the normalized cone resistance by mean effective stress. It is also observed that the normalized dilatometer modulus by mean effective stress($E_D/{\sigma_m}'$) is unique correlated with the state parameter, regardless of stress history.

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Breaker Point 型 점火裝置 性能 을 極大化하기 위한 Pre - Resistance 효果 에 對한 硏究 (A Study of the Pre-Resistance Effects on the Optimization For Performance of the Ignition System with the Breaker Point Type)

  • 손병진;신영철
    • 대한기계학회논문집
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    • 제6권2호
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    • pp.133-139
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    • 1982
  • One of factors that affect combustion in the cylinder of the engine is to keep a greater energy in the ignition system to minimize pollutant emissions and to increase its performance of the low temperature. This paper reviews theoretically the state and input variables of the ignition system from the state transition equation. Effects on characteristics of the system such as primary current, secondary available voltage and spark duration by reducing the pre-resistance from 3.5 to 0 ohm in 12V system is experimentally investigated when the ignition coil has a primary resistance of 1.5 ohms ad the dwell angle of the breaker point is 43.2 degrees (0.75 radian). Advantages and limitations for using the low resistance of the primary circuit are also presented to optimize the performance of the ignition system with the breaker point.

지반조사결과에서 설계변수의 결정문제 -지반특성치 산정을 중심으로- (Determination of Design Parameters from Ground Investigation Results -Focus on geotechnical characteristic values-)

  • 윤길림;윤여원;김홍연
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2008년도 추계 학술발표회
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    • pp.126-133
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    • 2008
  • Geotechnical limit state design methods; LRFD of North America is an approach that estimates resistance using design model and then multiplies resistance factor by calculated resistance to reflect the uncertainty of geomaterials and design models; whereas, Eurocode of the Europe employs the partial resistance factor applied directly to each variable in the resistance equation that individual soil properties such as cohesion and angle of internal friction are applied. This discussion paper is a study on characteristic value which has globally been argued through processing of development of Eurocode 7 for geotechnical design even to the present. Estimating the characteristic value of soil properties affects not only determination of design value applied directly to design of geotechnical structures, but also economic feasibility and stability of the structures.

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재 프로그래밍 방법에 의한 MIM ANTIFUSE의 온저항 감소 효과 (On-state resistance secreasing effect of mim antifuse by re-programming method)

  • 임원택;이상기;김용주;이창효;권오경
    • 한국진공학회지
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    • 제6권3호
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    • pp.194-199
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    • 1997
  • Al/a-Si:H/Mo 구조의 MIM(Metal-Insulator-Metal) antifuse를 제작하여 antifuse의 I-V 특서을 조사하고, 온저항의 분포를 구하였다. 제작된 antifuse의 누설전류는 1pA/$\mu\textrm{m}^2$이하였고, 프로그래밍 전압은 10~11V 내에 분포하였다. 프로그램 후 온저항은 대부분 10~20 Ω이었고, 20%정도는 100$\Omega$이상의 분포도를 보였다. 이러한 온저항 분포의 편차와 저항값을 줄이기 위해 이미 프로그램된 antifuse에 다시 전류를 주입하는 재 프로그래밍 방법을 시도 하였다. 이 방법을 통하여 100$\Omega$이상의 온저항을 가지는 antifulse를 다시 50$\Omega$이하로 낮출 수 있었다. 재 프로그래밍 방법을 사용한 antifuse는 한번만 프로그래밍 했을 때 보다 더욱 더 균일하고 낮은 온저항 분포를 가졌다.

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ANN에 의한 유도전동기의 회전자 저항 추정 (Rotor Resistance Estimation of Induction Motor by ANN)

  • 고재섭;최정식;정동화
    • 조명전기설비학회논문지
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    • 제20권10호
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    • pp.27-34
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    • 2006
  • 본 논문은 드라이브의 간적벡터제어에서 ANN을 이용하여 유도전동기의 회전자 저항을 온라인 추정하기 위한 새로운 기법을 제시한다. 약전파 알고리즘은 신경회로망의 학습을 위해 사용된다. 신경회로망의 실제 상태값과 유도전동기의 요구값 사이의 오차는 신경회로망 모델의 하중값 조절을 위하여 역전파 하여 실제값이 요구값을 추정하도록 한다. 드라이브의 회전자 저항, 토크, 자속응답 성능등 이러한 추정기의 성능은 고유값으로부터 회전자 저항을 연구하게 된다. 회전자 저항은 유도전동기 드라이브의 벡터제어에서 제시된 ANN을 사용하여 추정한다.

Effects of monochromatic lights on the growth performance, carcass characteristics, eyeball development, oxidation resistance, and cecal bacteria of Pekin ducks

  • Hua, Dengke;Xue, Fuguang;Xin, Hairui;Zhao, Yiguang;Wang, Yue;Xiong, Benhai
    • Animal Bioscience
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    • 제34권5호
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    • pp.931-940
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    • 2021
  • Objective: Light is a significant component of housing environment in commercial poultry industry. This study was conducted to investigate whether Pekin ducks perform better under monochromatic lights than under white light with respect to their growth performance, carcass quality, eyeball development, oxidation resistance, and cecal bacterial communities. Methods: A total of 320 one-day-old male Pekin ducklings were randomly distributed into five rooms with different light treatments, white, red, yellow, green, and blue light. Each room consisted of 4 replicated pens with 16 ducklings per pen. Results: Blue light significantly decreased fat deposition by decreasing abdominal fat. Long wavelength light, such as red, green, and yellow light, considerably increased the back-to-front eyeball diameter and the red light potentially enlarged the side-to-side eyeball diameter. Besides, the blue light had adverse effects on the oxidation resistance status in terms of increasing the product malonaldehyde of lipid oxidation and decreasing the plasma concentration of total superoxide dismutase. The phyla of Firmicutes had the greatest abundance in the green and blue treatments, while Bacteroidetes in blue treatment was the least. The genus of Faecalibacterium was significantly lower under the red light. Conclusion: The high risk of cecal health status and decreased anti-oxidation activity were observed under blue light. Red, yellow, and green light might increase the risk of oversized eyeball and cecal illness. Therefore, monochromatic lights compared to white light did not show advantages on the performance of housing ducks, it turns out that the white light is the best light condition for grow-out ducks.

Lower Antibody Response in Chickens Homozygous for the Mx Resistant Allele to Avian Influenza

  • Qu, L.J.;Li, X.Y.;Xu, G.Y.;Ning, Z.H.;Yang, N.
    • Asian-Australasian Journal of Animal Sciences
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    • 제22권4호
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    • pp.465-470
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    • 2009
  • The chicken Mx gene has been regarded as a candidate gene for resistance to avian influenza virus (AIV). In this study, three groups of chickens with homozygotes (AA, GG) and heterozygotes (AG) of the resistant (A) and susceptible alleles (G) to AIV of the Mx gene were constructed from a line of dwarf egg-type chickens. These chickens were not examined for their resistant activities to AIV because the differential resistance had only been detected in vitro. The birds of the three groups were vaccinated with inactivated H5N2 AIV vaccine and the level of hemagglutination inhibition (HI) antibody to AIV was detected. The association between disease resistant activity to AIV and antibody response to AIV vaccination in the three groups was analyzed. The chickens with homozygous resistant allele A showed the lowest antibody levels, whereas the heterozygous chickens (AG) presented the highest antibody level after the boosting vaccination, which indicates that the efficiency of artificial selection on the resistant allele of Mx gene will be compromised since the homozygotes of the allele presented the weakest antibody response to the corresponding vaccine.

저층 트롤선의 유효마력 산정에 관한 실험적 연구 (Experimental study on the estimating effective horse power of a bottom trawl ship)

  • 왕우경
    • 수산해양기술연구
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    • 제41권3호
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    • pp.227-233
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    • 2005
  • In order to estimate the effective horse power(EHP) in towing net of a bottom trawl ship, the ship's resistance was calculated by using a series data of Yamagata and Wigley formula. Also the effective horse power for a ship(EHPs) was estimated versus the ship speed in sailing and the propulsive efficiency was calculated with the brake horse power and the effective horse power. Then the effective horse power for a ship and a trawl net were estimated in the application of the propulsive efficiency in towing net. The total effective horse power($EHP_T$) was average 187.6kW and the effective horse power for a 1.awl net($EHP_n$) was average 176.7kW at a smooth sea state in towing net. The ratio of $EHP_n$ to $EHP_T$ was about 94.0% and the value was higher slightly than was already informed at a smooth sea state. The power for keeping up a townet speed was required more about 20% of a maximum continuous power at a rather rough sea state than a smooth sea state. In the future, if the residual resistance is considered with a sea state, $EHP_n$ will be estimated more correctly Also the data of EHP estimated by this method will be used as the basic data to design a trawl net.

일차진료 항생제 치료기간과 비인두 항생제 내성률에 대한 연구 고찰 (A Review of Studies on Antibiotic Course and Antibiotic Resistance in Nasopharyngeal Pathogens in Primary Care Setting)

  • 신향화;이선행;윤성중;장규태
    • 대한한방소아과학회지
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    • 제32권2호
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    • pp.64-71
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    • 2018
  • Objectives The purpose of this study is to examine the correlation of antibiotics administration duration and antimicrobial resistance by reviewing domestic and foreign literatures. Methods We searched literatures dated up to 23 February, 2018 in PubMed and Cochrane Library using terms of "Anti-Bacterial Agents", "Carrier State", "Nasopharynx", "Drug Administration Schedule", and also searched via RISS (Research Information Service System), KISS (Koreanstudies Information Service System), DBpia (DataBase Periodical Information Academic) using terms of antibiotics, resistance, and dose. Results In comparison with shortened and standard antibiotic course, longer treatment duration is associated with greater antimicrobial resistance or non-significant difference, but we cannot find literature that shortened antibiotic course increases antimicrobial resistance on human nasopharyngeal flora. Conclusions Currently, there is no evidence that completing the standard antibiotic course reduces antimicrobial resistance. It can be a strategy for reducing antibiotic use to apply Korean medicine treatment, as well as short-course antibiotic therapy or delayed antibiotic prescription. Additional well-designed trials should be conducted in domestic and foreign settings about the appropriate duration of antibiotic therapy.