• Title/Summary/Keyword: Pulse condition

검색결과 780건 처리시간 0.032초

실온 펄스도금법을 이용한 STS 316L 표면의 Ni 도금 저가형욕 연구 (Study of Ni-coating on 316L Stainless Steel by Pulse Electroplating in Various Bath Conditions at Room Temperature)

  • 정세진;조계현
    • 한국표면공학회지
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    • 제35권1호
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    • pp.53-63
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    • 2002
  • Ni coating was carried out by pulse plating at room temperature. So, experimental conditions for Ni-coating were based on Watt's bath, and new additives(propionic acid) were introduced in the Watt's bath electrolyte as $H_3$$BO_3$ alternatives. By adding propionic acid, coating layer demonstrated a good adhesion and uniformity without special pre-treatment of the 316L stainless steel at room temperature. With a decrease of amount of propionic acid and applied average current density, cathode current efficiency increased. Also, edge effect was decreased with decreasing a peak current and increasing a pulse frequency in the same bath condition. It was found that the optimum condition for Ni coating was a current density of 10~20mA/$\textrm{cm}^2$ at below 500 mA peak current in the $5m\ell/\ell$ propionic acid solution.

반도체 소자기반 펄스 전원용 게이트 구동 및 시험회로 설계 (Design of gate driver and test circuits for solid-state pulsed power modulator)

  • 공지웅;옥승복;안석호;장성록;류홍제
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2012년도 전력전자학술대회 논문집
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    • pp.230-231
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    • 2012
  • This paper describes a gate driver that operates numerous semiconductor switch in the solide-state pulsed power modulator. the proposed gate driver is designed to receive both the isolated drive-power and the on/off pulse signals through the transformer. Moreover, the IGBT-switch can be quickly turned off by adding protection circuit. Therefore it protects the IGBT-switch from the arc condition that frequently occurs in high-voltage pulse application. To comprehend operating characteristic of each IGBT-switch in pulse output condition, the device consisting of a high efficiency soft-switching capacitor charger and two series stacking IGBT-switch is developed. Finally, the relability of the proposed gate driver and the device for its test are proved through PSpice simulation and experiments.

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맥진(脈診)의 사상의학적(四象醫學的) 고찰(考察) (The Sasang Constitutional Thought of Pulse Diagnosis)

  • 김인태;이수경;이의주;고병희;송일병
    • 사상체질의학회지
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    • 제15권3호
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    • pp.22-32
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    • 2003
  • The pulse diagnosis is the basic method of oriental medicine diagnosis. But in sasang constitutional medicine, it is said that it's not a major diagnotic method. But we don't have any sasang constitutional study of the pulse diagnosis. So I made this study by research of changing concept of the pulse diagnosis in chinese medical history and Dongyi Suse Bowon (longevity and life preservation in oriental medicine). The conclusion as follows. 1. There were many kinds of the pulse diagnosis in the ancient times, it has developed to simple and effective diagnotic method. Simple and effective is the major point of medical development, the 24 pulse is abridged to Floating Pulse(浮), Deep Pulse(沈), Slow Pulse(遲), Rapid Pulse(數) 2. The latter term of Chosun, the practical study was developed. In the view of the practical study, the pulse diagnosis has a lot of cricical point. Jung Yak-Yong, in his writing Mak Lon(脈論), criticize the pulse diagnosis. 3. In the sasang constitutional medicine, the constitutional diagnosis is very important. The methods of the constitutional diagnosis are three, the way of mind and greed, knowledge and deed, external figure and physical traits. But the pulse diagnosis is one of the way of external figure and physical traits, so we can't diagnose the exact constitution by the pulse diagnosis. 4. Dong-mu conclude that the pulse diagnosis is just the diagnostic way of symptom. But in the clinical situation, the ordinary symptoms are more important than the pulse diagnosis, because it is useful to know the condition of the ingestive food metabolism and the Qi-yack metabolism

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Design and Construction of a Pick-up Type Pulse Crop Harvester

  • Lee, Ki Yong;Yoo, Soonam;Han, Byung Hee;Choi, Yong;Choi, Il Su
    • Journal of Biosystems Engineering
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    • 제42권1호
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    • pp.12-22
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    • 2017
  • Purpose: This aim of this study was to develop a pick-up type pulse crop harvester for harvesting cut and dried pulse crop. Methods: The pick-up type pulse crop harvester was designed and constructed. Its specifications and operating performance were investigated. Results: Compared with conventional bean harvesters, the pick-up type pulse crop harvester adopted seven rows of chains with tines to pick-up the cut and dried pulse crop on a flat or ridged field, two transverse threshing drums with steel wire teeth to reduce the threshing speed, and a tilt plate and plastic bucket elevator for conveying clean grain to reduce damage. The threshing speed and the oscillating frequency of the separating and cleaning parts according to crop type and condition could be varied easily to efficiently use engine power and to improve harvesting performance. The harvester showed forward speed ranges of 0 ~ 1.5 m/s during harvesting operation, and 0 ~ 2.5 m/s during road travelling. The pick-up width of the harvester was about 1 m. Conclusions: The pick-up type self-propelled 51.5 kW harvester was designed and constructed to harvest cut and dried pulse crop. The effective field capacity of the harvester was predicted as above 40 a/h.

A Vascular Characteristic Index of Blood Pressure Variation using the Pulse Wave Signal

  • Kim, Gi-Ryon;Jung, Dong-Keun;Ye, Soo-Young;Jeon, Gye-Rok
    • Transactions on Electrical and Electronic Materials
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    • 제9권5호
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    • pp.213-219
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    • 2008
  • Pulse waves continuously change with respect to the characteristics and status of the cardiovascular system and in relation to the blood pressure (BP) and the pulse wave velocity (PWV). Monitoring the vascular condition by analyzing the variations in pulse waveforms has been used to diagnose vascular disorders and in drug treatment of arteriosclerosis and peripheral circulatory obstruction. In this paper, we investigated the vascular characteristic index with regard to the BP and classified by pulse wave signals. The pressure pulse wave and photoplethysmography (PPG) were measured simultaneously while subjects exercised, producing changes in the BP, to analyze the variation in the vascular characteristic index. We investigated the correlation between the BP and vascular characteristic index with regard to the classification methods of the pulse wave. The reflection index (RI) and vascular stiffness index were correlated with the diastolic BP, but no correlation was found between these parameters and the systolic BP. These results suggest the possibility of estimating BP through simple measurements of pulse waves.

요골동맥 직경 변화에 따른 맥파 측정 시스템 개발 (Development of an Measuring System for Pulse Wave Corresponding to Different Radial Artery Diameters Caused by Indentation)

  • 이전;우영재;전영주;이유정;김종열
    • 전기학회논문지
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    • 제57권12호
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    • pp.2351-2357
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    • 2008
  • Noninvasive radial artery pulse wave has been widely used not only for the pulse wave analysis(PWA) itself but also for assessment of arterial stiffness with estimated aortic pulse wave from peripheral pulse wave. However, it has been found that the deformation of pulse shape can be caused readily by changing measuring position, indentation pressure, and so on. So, in this study, we have developed a system which can measure radial pulse wave and skin displacement simultaneously while the indentation body goes down to occlude subject's radial artery. This system can be divided into a measuring apparatus part, an indentation control hardware part, a data acquisition part and a control and computation part. And, the measuring apparatus consists of an arm-rest, a step motor, an indentation body, a laser displacement sensor(LK-G30, Keyence Co.) and pulse wave sensor. Under load-free condition and radial artery loaded condition, the evaluation of developed system has been performed. From these results, we can conclude: 1) The developed system can control the indentation body quantitatively and the adopted laser displacement sensor shows linear output characteristic even with skin as a reflector. 2) This system can measure the pulse wave and the displacement of indentation body, that is, skin displacement simultaneously at each specific level of indentation body. 3) This system can provide the number of motor steps used to get down the indentation body, the measured skin displacement, the calculated indentation pressure, the calculated pulse pressure and the pulse waveform as well as the information generated by combining these with each others. 4) This system can reveal the relationship between the morphological changes of pulse wave and the estimated displacement of radial artery wall by indentation. Consequently, the developed system can furnish more abundant information on radial artery than previous diagnosis systems based on tonometric measurement. In further study, we expect to setup the standard measuring process and to concrete the algorithm for the estimation of radial artery's diameter and of displacement of radial artery's wall. Furthermore, with well designed clinical studies, we hope to turn out the usefulness of developed system in the field of cardiovascular system evaluation.

Nd:YAG 레이저 용접에 의한 계장 조사연료봉 제조에 관한 연구 (A Study on the Manufacture of instrumented Irradiation Fuel by Nd:YAG Laser Welding)

  • 이철용;이도연;김수성;송기찬
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2004년도 춘계 학술발표대회 개요집
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    • pp.115-117
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    • 2004
  • Nd:YAG laser welding system was used to manufacture instrumented irradiation fuel. The optimal condition of zircaloy-4 seal tube is charge voltage 180V and pulse per energy 51. We got good welding result in charge voltage 400V, pulse width 7ms, pulse frequency 5 in zircaloy-4 endcap welding.

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A DELAYED SIR EPIDEMIC MODEL WITH NONLINEAR INCIDENCE RATE AND PULSE VACCINATION

  • Du, Yanke;Xu, Rui
    • Journal of applied mathematics & informatics
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    • 제28권5_6호
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    • pp.1089-1099
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    • 2010
  • An SIR epidemic model with pulse vaccination and time delay describing infection period is investigated. The global attractiveness of the infection-free periodic solution is discussed, and sufficient condition is obtained for the permanence of the system. Our results indicate that a large vaccination rate or a short period of pulsing leads to the eradication of the disease.

기구인영맥(氣口人迎脈)의 '관전일분처(關前一分處)' 비정(比定)과 관맥(關脈) 형성과정(形成過程)의 상관성(相關性)에 관한 연구(硏究) (The study on the interrelationship of fixing the Ki-Gu(氣口) pulse and the Yin-Yeong(人迎) pulse in front of Kwan(關) the distance of 1 Pun(分) and the development of the Kwan-Pulse(關脈))

  • 김정규
    • 대한한의진단학회지
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    • 제13권2호
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    • pp.14-23
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    • 2009
  • In the Ki-Gu(氣口) pulse and the Yin-Yeong(人迎) pulse are the arterial pulsation position of the Lung Channel of Hand-Taeuem(手太陰) and the Stomach Channel of Foot-Yangmyeong(足陽明). At the pulses we can examine the circulation of Ki-Hyeol(氣血), the balance of Uem-Yang(陰陽), the deficiency and excess of the diseases, whether the disease is in Uem-Channel(陰經) or Yang-Channel (陽經), whether the disease is internel injury or externel injury. In the Ki-Gu(氣口) pulse and the Yin-Yeong(人迎) pulse are in front of the Right-Kwan(右關) and the Left-Kwan(左關) the distance of 1 Pun(分) because of completion of the Chon-Ku-Pulse-Taking(寸口脈診). The purpose of examnation is same to . In the Kwan-Pulse(關脈) doesn't have the position. It has only the role of a gateway of the circulation of Ki-Hyeol(氣血), the balance of Uem-Yang(陰陽). And it is same to role of the Ki-Gu(氣口) pulse and the Yin-Yeong(人迎) pulse in . So we can think that the Kwan-Pulse(關脈) in and the Ki-Gu(氣口) pulse and the Yin-Yeong(人迎) pulse in are the same thing. And we must have the different standard when examine the condition of Sam-Cho(三焦) and the circulation of Ki-Hyeol(氣血), the balance of Uem-Yang(陰陽) because the position of the Kwan-Pulse(關脈) came out after the time of .

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