• 제목/요약/키워드: Drop Out

검색결과 1,045건 처리시간 0.028초

Low Drop-Out (LDO) Voltage Regulator with Improved Power Supply Rejection

  • Jang, Ho-Joon;Roh, Yong-Seong;Moon, Young-Jin;Park, Jeong-Pyo;Yoo, Chang-Sik
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제12권3호
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    • pp.313-319
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    • 2012
  • The power supply rejection (PSR) of low drop-out (LDO) voltage regulator is improved by employing an error amplifier (EA) which is configured so the power supply noise be cancelled at the output. The LDO regulator is implemented in a 0.13-${\mu}m$ standard CMOS technology. The external supply voltage level is 1.2-V and the output is 1.0-V while the load current can range from 0-mA to 50-mA. The power supply rejection is 46-dB, 49-dB, and 38-dB at DC, 2-MHz, and 10-MHz, respectively. The quiescent current consumption is 65-${\mu}A$.

환형소결체 하나로 조사시험용 무계장 리그의 차압 및 유동유발 진동시험 (Pressure Drop and Flow-Induced Vibration Test for the HANARO Non-instrumented Irradiation Test Rig of Annular Fuel Pellet)

  • 이강희;김대호;방제건
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.281-286
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    • 2007
  • Needs of fuel's performance evaluation for the dual-cooled fuel pellet (annular shape) necessitate the irradiation test in the test reactor. Irradiation test rig for the HARARO reactor, which is a special-purposed equipment used for material, irradiation and creep test, must satisfy the operational requirement on the hydraulic characteristics and structural integrity. In this paper, pressure drop and flow-induced vibration test for the newly developed non-instrumented test rig were carried out using FIVPET as a out-pile evaluation test. The test results show that the new test rig satisfy the HANARO operational requirement with sufficient margin. The spectral response characteristics of the flow-induced vibration of the test rid were also discussed.

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An Adaptive Drop Marker for Edge Routers in DiffServ Networks

  • Hur, Kyeong
    • Journal of information and communication convergence engineering
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    • 제9권4호
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    • pp.411-419
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    • 2011
  • In this paper, we propose an Adaptive Regulating Drop (ARD) marker, as a novel dropping strategy at the ingressive edge router, to improve TCP fairness in assured services (ASs) without a decrease in the link utilization. To drop packets pertinently, the ARD marker adaptively changes a Temporary Permitted Rate (TPR) for aggregate TCP flows. The TPR is set larger than the current input IN packet rate of aggregate TCP flows while inversely proportional to the measured input OUT packet rate. To reduce the excessive use of greedy TCP flows by notifying droppings of their IN packets constantly to them without a decrease in the link utilization, the ARD marker performs random early fair remarking of their excessive IN packets to OUT packets at the aggregate flow level according to the TPR. In addition, an aggregate dropper is combined to drop some excessive IN packets fairly and constantly according to the TPR. Thus, the throughput of a TCP flow no more depends on only the sporadic and unfair OUT packet droppings at the RIO buffer in the core router. Then, the ARD marker regulates the packet transmission rate of each TCP flow to the contract rate by increasing TCP fairness, without a decrease in the link utilization.

선박 내 유선망에서 차등화 서비스 기술 (Differentiated Services in Wired Ship Area Networks)

  • 정환종;김성표;박진관;오주성;이승범;허경;정민아;이성로
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2014년도 추계학술대회
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    • pp.165-167
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    • 2014
  • 본 논문에서는 선박 내 유선 네트워크에서 차등화 서비스를 지원하기 위해, 기존 RIO (RED In and Out) 방식보다 우수한 패킷 폐기 기술을 제안한다. 제안한 패킷 폐기기술은 개별 플로우별로 관리하지 않고 특정한 기준에 따라 몇 개의 플로우 그룹으로 나누어, 그룹별 관리를 통해서 동일 클래스 내 플로우 간 공평성을 제공한다. 시뮬레이션 결과에서는 RIO 방식보다 링크 이용률은 조금 감소하나, 다중 병목 구간을 경유하는 플로우들이 RIO 방식보다 더 많은 전송률을 보장 받음을 알 수 있다.

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곡관과 연속된 경사관 내에서 유동하는 아이스슬러리의 압력손실에 미치는 유속의 영향 (Influence of Velocity on Pressure Drop of Flowing Ice Slurry in Elbow and its continued Inclined Tube)

  • 박기원;김규목
    • 설비공학논문집
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    • 제17권7호
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    • pp.635-641
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    • 2005
  • This study experimented to understand the effects of transporting ice slurry through elbow and inclined tube. And at this experiment it used propylene glycol-water solution and a diameter of about 2mm ice particle. The experiments were carried out under various conditions, with velocity of water solution at the entry ranging from 1.0 to 3.5 w/s and elbows and inclined tubes of 4 kinds angle with $30^{\circ},\;45^{\circ},\;90^{\circ}\;and\;180^{\circ}$. The pressure drop between the tube entry and exit were measured. According to angle of bending, the highest pressure drop was measured at $30^{\circ}$ elbow and the lowest pressure drop was measured at $90^{\circ}$ elbow, and there are only a little differences of pressure drop between $45^{\circ}$ elbow and $180^{\circ}$ elbow. According to angle of inclined tube, the highest pressure drop was measured at $90^{\circ}$ inclined tube and the pressure drop at $45^{\circ},\;30^{\circ},\;180^{\circ}$ inclined tubes were lower successively. The lowest pressure drop in elbows and inclined tubes was measured at velocity of $2.0\~2.5$ m/s and concentration of $10\;wt\%$.

R-404A를 사용한 용접형 판형 열교환기의 압력강하 및 응축 열전달특성에 관한 연구 (Study on Pressure Drop and Condensation Heat Transfer Characteristics of R-404A in Brazed Plate Heat Exchanger)

  • 권오갑;전창덕;강종식;이진호
    • 설비공학논문집
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    • 제13권3호
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    • pp.174-183
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    • 2001
  • Experimental study has been carried out on the characteristics of pressure drop and heat transfer of brazed plate heat exchangers using R-404A. Data are presented for the following range of variables: the mass flux ($20~80kg/m^2s$), chevron angle($20^{circ}C,\;35^{circ}C,\;45^{circ}C$) and inlet pressure of he refrigerant (1.4 and 1.6 MPa). for both subcooled and tow-phase flow, as chevron angle increases, pressure drop and heat transfer coefficient decrease. Condensation hat transfer coefficient and pressure drop was compared with the previously proposed correlations. Among them, Traviss correlation agreed with experimental results within -35~82% for heat transfer coefficient and -73~93% for pressure drop.

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흡수식 냉동기용 엘리미네이터의 압력손실 및 액적유입 특성 (Pressure Drop and Refrigerant-Entrainment Characteristics of the Eliminators used in Absorption Chillers)

  • 정시영;류진상;이상수;이정주
    • 설비공학논문집
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    • 제15권2호
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    • pp.109-115
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    • 2003
  • The performance of two vertical-blade eliminators (V1, V2) and two horizontal-blade ones (H1, H2) for absorption chillers were tested in terms of pressure drop and refrigerant entrainment. The test was carried out using a wind tunnel with a cross section of 300 mm$\times$300 mm. The pressure drop of four eliminators tested was found to be in the rage of 1.0~2.7mm $H_2O$ at the face velocity of 2m/s. In the refrigerant entrainment test the vertical-blade eliminators showed much better performance than the horizontal-blade ones. The horizontal-blade eliminators showed satisfactory results at the air velocity of 2m/s but exceeded the limit value at 3 m/s. Since the cooling capacity of a machine is lowered by about 2.5% at the pressure drop of 1 m $H_2O$, more researches are required to reduce the pressure drop in the eliminator.

분무특성 예측을 위한 이론적 접근과 실험적 연구 (A numerical analysis and experimental study on the prediction of spray characteristics)

  • 윤석주;조대진
    • 한국분무공학회지
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    • 제3권2호
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    • pp.1-13
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    • 1998
  • A theoretical and experimental study was carried out to predict the drop size distribution of the pressure swirl atomizer. Various analytical methods using the Kelvin-Helmholtz instability theory were tried to examine the wave growth on cylindrical liquid sheets. Cylinderical liquid sheets were extended to the case with the conical sheets. Perturbations due to tangential motion as well as longitudinal one were taken into account. And it was assumed that the breakup occurs when amplitude ratio exceeds exp(12), drop sizes were predicted only by theoretical approach. Drop size distribution was obtained by using maximum entropy formalism. Seven constraints in the form of the definition of mean diameter were used in this formulation in order to avoid the difficulties of estimating source terms. In this study $D_{10}$ only was introduced into the formulation as a constraint. The predicted drop size and drop size distribution agreed well with the measured data.

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자동차용 열교환기 냉매의 압력 강하 특성에 관한 연구 (A Study on Pressure Drop Characteristics of Refrigerant in Heat Exchanger for Automobile)

  • 임태우;박종운
    • 한국자동차공학회논문집
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    • 제11권2호
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    • pp.119-125
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    • 2003
  • An experiment study on pressure drop was carried out for both an adiabatic and a diabatic two-phase flow with pure refrigerants R134a and Rl23 and their mixtures as test fluids in a uniformly heated horizontal tube. The frictional pressure drop during flow boiling is predicted by using two models; the homogeneous model that assumes equal phase velocity and the separate flow model that allows a slip velocity between two phases. The measured frictional pressure drop was compared to a few available correlations. Homogeneous model considerally underpredicted the present data for mixture as well as pure component in the entire mass velocity ranges employed in the present study, while Friedel correlation was found to satisfactorily correlate the frictional pressure drop data as compared to other correlation.

한국 가정폭력가해자 치료프로그램의 중도탈락요인 (A Study on the Factors Affecting Drop-out from the Domestic Violence Offenders' Treatment group Programs in Korea)

  • 김재엽;이지현
    • 한국사회복지학
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    • 제60권3호
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    • pp.231-251
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    • 2008
  • 본 연구는 가정폭력가해자의 치료프로그램 중도탈락을 방지하는 것은 피해여성에 대한 보호와 프로그램의 실질적인 효과성 증진을 위한 주요 과제라는 인식하에 전국 65개 가정폭력상담기관의 치료프로그램에 참여한 가정폭력가해자 총 280명을 대상으로 가정폭력가해자 치료프로그램 중도탈락에 영향을 미치는 요인들을 규명하였다. 그 결과, 가정폭력 치료프로그램에 참여한 가해자 총 280명 중 159명이 프로그램을 이수하였으며 121명이 프로그램을 탈락하여 43.2%의 중도탈락율을 나타내었다. 프로그램 중도탈락집단과 프로그램 이수집단을 각 특성별로 비교한 결과, 배우자와의 동거여부, 성역할 태도에서 유의미한 차이를 보였으며 치료프로그램 중도탈락에 영향을 미치는 요인을 파악하기 위한 로지스틱 회귀분석 결과, 직업유무, 프로그램 의뢰경로적 특성, 성역할태도 요인이 프로그램 중도탈락의 유의미한 영향요인으로 나타났다. 마지막으로 가정폭력가해자의 치료프로그램 탈락을 방지하기 위한 임상실천적, 정책적 개입 방안이 논의되었다.

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