• Title/Summary/Keyword: Pulse test

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Suggestion for Non-Destructive Testing Equation to Estimate Compressive Strength of Early Strength Concrete (조기강도 콘크리트의 압축강도 추정을 위한 비파괴검사 실험식의 제안)

  • Lee, Tae-Gyu;Kang, Yeon-Woo;Choi, Hyeong-Gil;Choe, Gyeong-Choel;Kim, Gyu-Yong
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.3
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    • pp.229-235
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    • 2016
  • In construction field, it used various technique for concrete formwork. Part of them, non-destructive test has been conducted to estimate a compressive strength of concrete easily such as rebound method and ultrasonic pulse velocity method etc. Former research has recommend proposed equation based on experimental data to investigate strength of concrete but it was sometimes deferent actual value of that from in field because of the few of data in case of early strength concrete. In this study, an experiment was conducted to analyze strength properties for early strength concrete using cylinder mold and $1,000mm{\times}1,000mm{\times}200mm$ rectangular specimen. And compressive strength of concrete was tested by non-destructive test, and calculated by the equation proposed former research. As a result, the non-destructive test results showed approximately 70 percent of the failure test value for all conditions, and worse reliability was obtained for high strength concrete samples when the ultrasonic pulse velocity method was used. Based on the scope of this study, the experimental equation for estimating compressive strength of early strength concrete from 24MPa to 60MPa was proposed.

The Development and Effects of Timeout Protocol for Safety in Cataract Surgery Patients (백내장 수술 환자 안전을 위한 타임아웃 프로토콜 개발 및 효과)

  • Seo, Eun Hee;Choi, Yeon Hee
    • The Korean Journal of Rehabilitation Nursing
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    • v.18 no.1
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    • pp.29-37
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    • 2015
  • Purpose: This study was conducted to develop effective timeout protocol in coordination with current practice and test its clinical effectiveness in pursuit of safety management for patients undergoing cataract surgery. Methods: A total of subjects were 60 women, 50~65 years old, who visit C ophthalmology clinic in D city. They were assigned to 30 experimental group and 30 control group, respectively. Based on the comprehensive literature review, timeout protocol that was suitable for patients undergoing cataract surgery was developed, and then test its effectiveness by measuring blood pressure, pulse, anxiety and sense of well-being among surgical patients. Results: The timeout protocol was found to reduce blood pressure, pulse, and anxiety and increase well-being among surgical patients. Conclusion: As a results, it is necessary to introduce an effective timeout protocol giving positive responses to surgical patients, hence it should be develop a timeout protocol and explore the effectiveness of the protocol.

Effects of Electric Heating Pad on Abdominal Pain and Anxiety during the Colonoscopy (복부가온패드 적용이 대장내시경 검사 대상자의 통증과 불안에 미치는 영향)

  • Kwon, Tae Jeong;Lee, Hyang Yeon;Lee, Jia
    • Journal of Korean Clinical Nursing Research
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    • v.14 no.2
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    • pp.47-57
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    • 2008
  • Purpose: The purpose of this study was to examine the effects of an electric heating pad on abdominal pain and anxiety during the colonoscopy procedure. Method: Data were collected from 70 adult patients (experimental group (35), control group (35)) who underwent colonoscopy in a general hospital in Seoul, South Korea between January 6 and May 4 2006. For the experimental group the electric heating pad was applied from 20 minutes before the test through the whole procedure. Objective pain was measured during the test, and subjective pain, state anxiety, blood pressure and pulse rate were measured after the procedure. Results: The experimental group with the electric heating pad reported significantly lower subjective pain and anxiety than did the control group. There were no significant differences in objective pain between experimental and control groups. Patients with an electric heating pad showed significantly lower systolic and diastolic pressure than did those in the control group. There was no significant difference in pulse rate between the groups. Conclusion: Use of an electric heating pad was efficient in reducing subjective pain and anxiety among patients undergoing colonoscopy. This is a convenient and useful nursing intervention to reduce anxiety and pain among patients having a colonoscopy.

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The Effect of Music Therapy on Anxiety of Cesarean Section Wemen (음악요법이 제왕절개 임부의 수술불안에 미치는 영향)

  • Kwun Young-Sook;Kim Tae-Hee
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.7 no.3
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    • pp.466-478
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    • 2000
  • The purpose of this study was to identify the effects of music therapy on anxiety of cesarean section wemen. The research design was a nonequivalent control group non-synchronized design. The subjects of this study were 65 cesarean section wemen scheduled for surgery. The study was conducted from October 15, 1999 to January 5, 2000. Two groups consisted of subjects assigned : one the experimental group(33 wemen), and the other the control group(32 wemen). The music therapy was performed 3 times to experimental group just before surgery day, on surgery day. The level of anxiety was measured by State Anxiety Inventory, blood pressure, pulse rate, respiratory rate. The data were analyzed using descriptive statistics, $x^2-test$, t-test, Repeated measures of ANCOVA. The results of study were as fellows : 1) State anxiety scores were significantly different between the experimental group and the control group after music therapy. 2) Systolic blood pressures and diastolic blood pressures were significantly different between the experimental group and the control group after music therapy. 3) Pulse rates were significantly different between the experimental group and the control group after music therapy. 4) Respiratory rates were significantly different between the experimental group and the control group after music therapy. According to these results, music therapy can be regarded as an effective nursing intervention that relieves anxiety of cesarean section wemen.

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Thermal Behavior Variations in Coating Thickness Using Pulse Phase Thermography

  • Ranjit, Shrestha;Chung, Yoonjae;Kim, Wontae
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.4
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    • pp.259-265
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    • 2016
  • This paper presents a study on the use of pulsed phase thermography in the measurement of thermal barrier coating thickness with a numerical simulation. A multilayer heat transfer model was ussed to analyze the surface temperature response acquired from one-sided pulsed thermal imaging. The test sample comprised four layers: the metal substrate, bond coat, thermally grown oxide and the top coat. The finite element software, ANSYS, was used to model and predict the temperature distribution in the test sample under an imposed heat flux on the exterior of the TBC. The phase image was computed with the use of the software MATLAB and Thermofit Pro using a Fourier transform. The relationship between the coating thickness and the corresponding phase angle was then established with the coating thickness being expressed as a function of the phase angle. The method is successfully applied to measure the coating thickness that varied from 0.25 mm to 1.5 mm.

Investigation on stability characteristics of 2G HTS coated conductor tapes with various stabilizer thickness

  • Quach, Huu Luong;Kim, Ji Hyung;Hyeon, Chang Ju;Chae, Yoon Seok;Moon, Jae Hyung;Kim, Ho Min
    • Progress in Superconductivity and Cryogenics
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    • v.20 no.1
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    • pp.19-22
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    • 2018
  • The thermal and electrical properties of the conductor are critical parametersfor the design and optimization of the superconducting magnet. This paper presents simulation code to analyze electrical and thermal stability characteristics of the second generation (2G) high-temperature superconductor (HTS) by varying copper stabilizer thickness. Two types of commercial 2G HTS coated conductor tapes, YBCO and GdBCO were used in this study. These samples were cooled by Liquid Nitrogen ($LN_2$) having boiling at 77.3 K and an equivalent electrical circuit model for them is choosen and analysed in details. Also, an over-current pulse test in which a current exceeding a critical current was performed. From the simulation results, the influences of the copper stabilizer thickness on the stability characteristics of these samples are presented.

Crack Size Determination Through Neural Network Using Back Scattered Ultrasonic Signal (저면산란 초음파 신호 및 신경회로망을 이용한 균열크기 결정)

  • Lee, Jun-Hyeon;Choe, Sang-U
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.1 s.173
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    • pp.52-61
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    • 2000
  • The role of quantitative nondestructive evaluation of defects is becoming more important to assure the reliability and the safety of structure, which can eventually be used for residual life evaluation of structure on the basis of fracture mechanics approach. Although ultrasonic technique is one of the most widely used techniques for application of practical field test among the various nondestructive evaluation technique, there are still some problems to be solved in effective extraction and classification of ultrasonic signal from their noisy ultrasonic waveforms. Therefore, crack size determination through a neural network based on the back-propagation algorithm using back-scattered ultrasonic signals is established in this study. For this purpose, aluminum plate containing vertical or inclined surface breaking crack with different crack length was used to receive the back-scattered ultrasonic signals by pulse echo method. Some features extracted from these signals and sizes of cracks were used to train neural network and the neural network's output of the crack size are compared with the true answer.

The Effect of Music Therapy on Anxiety in Neurotic Patients (음악요법이 신경증 환자의 불안에 미치는 영향)

  • 김소야자;한금선
    • Journal of Korean Academy of Nursing
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    • v.26 no.4
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    • pp.889-902
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    • 1996
  • The purpose of this study was to identify the effects of music therapy on anxiety in neurotic patients. The subjects of the study were 41 patients that had been diagnosed as having anxiety disorder, neurotic depression, or somatization disorder and were admitted to one general hospital in Seoul. The 41 research subjects were assigned to an experimental (22 clients) and a control (19clients) group. Data were gathered from September. 25, 1995 to December. 15, 1995 using a questionnaire and physiological measurement tool. Data were analyzed with the SAS package using frequency, t-test, paired t-test and Pearson correlation coefficients. The results of this study are as follows ; 1. There were significant differences between two groups on systolic and diastolic blood pressure, and pulse rate after treatment. In the experimental group, Systolic and diastolic blood pressure, and pulse rate decreased significantly after Music Therapy. 2. There were no significant differences between the two groups on the pre and post psychological anxiety score. But, after music therapy, experimental group had a lower psychological anxiety score than the control group. From these results, it is concluded that the music therapy can be effective in decreasing anxiety in neurotic patients.

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Rupture Prediction of the Rupture Disc Tests using Elastic-Plastic Analysis (탄소성해석을 이용한 파열판의 파열예측)

  • Han, Houk-Seop;Lee, Won-Bok;Koo, Song-Hoe;Lee, Bang-Eop
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.481-487
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    • 2011
  • This paper provides a comparison between finite element analysis results and test data of rupture disc. Rupture disc is safety device of high pressure equipment. Rupture disc of solid rocket motor is a device to control rupture pressure. Rupture discs were made of AISI 316L. By the elastic-plastic analysis, the stress limit of rupture discs were compared to the test results. The results can be used to control the rupture pressure by the change of the disc size.

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Study on the Validity of Recently Introduced Wrist Watch Type Heart Rate Monitoring Device (최근 소개된 손목형 심박수 측정 장치의 유용성에 관한 연구)

  • Yoo, Seunghoon
    • Journal of the korean academy of Pediatric Dentistry
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    • v.41 no.1
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    • pp.27-33
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    • 2014
  • There are several ways to analyse stress resulting from anxiety and fear within dental treatment for children. Surveying questionnaires and monitoring biologic reaction are the most common ways for evaluating stress. Pulse oximeter is a popular device for detecting heart rate but not appropriate for moving children. In this study, we compared a recently introduced wrist- watch type heart rate monitor(Alpha, MIO, USA) with a pulse oximeter(MP110, MECKIS, Republic of Korea) for 10 attendants with two conditions including resting state and excited state after exercise. Data were analyzed using Wilcoxon Signed Rank test and there is no statistical difference between two devices(p < 0.05).