• Title/Summary/Keyword: 소구경

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Tissue Engineering for Cardiovascular Diseases

  • Kim, Byeong-Su
    • 순환기질환의공학회:학술대회논문집
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    • 2004.05a
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    • pp.78-111
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    • 2004
  • o 골수중간엽줄기세포와 생체재료를 이용하여 소구경 동맥을 조직공학적으로 재생할 수 있다. o G-CSF의 투여는 조직공학적 소구경 인공동맥의 혈관내피 생성을 촉진시킬 수 있다.

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Technology Based on Wall-Thinning Prediction and Numerical Analysis Techniques for Wall-Thinning Analysis of Small-Bore Carbon Steel Piping (감육예측 및 수치해석 기법을 활용한 소구경 탄소강배관 감육영향 분석에 관한 연구)

  • Lee, Dae-Young;Hwang, Kyeong-Mo;Jin, Tae-Eun;Park, Won;Oh, Dong-Hoon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.4
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    • pp.429-435
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    • 2010
  • In approximately fifty utilities, including KHNP (Korea Hydro & Nuclear Power), CHECWORKS is used as a tool for predicting and managing the wall thinning of carbon steel piping; this wall thinning is caused by flow-accelerated corrosion (FAC). It is known that CHECWORKS is only applicable to predict the wall thinning of piping with large bores. When dealing with small-bore steel piping, FAC engineers measure the thickness of the susceptible area that is selected on the basis of the experience and judgment of the engineer. This paper proposes the application of CHECWORKS for the management of wall thinning of small-bore piping. Four small-bore pipelines of a domestic nuclear power plant were analyzed from the viewpoints of FAC and fluid dynamics by using CHECWORKS and FLUENT code. Depending on the engineer's skill, CHECWORKS can also be used for the management of wall thinning of small-bore piping.

Automatic Inspection Technology for Small Bore Penetration Nozzle in High Radiation Area of Nuclear Power Plant (원자력발전 고방사선구역 소구경 노즐에 대한 자동화검사 기술)

  • Ryu, Sung Woo;Yoon, Kee Bong;Jeon, Gyu Min;Seong, Un Hak
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.6
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    • pp.504-509
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    • 2016
  • Defects in dissimilar metal welds are reported to be on the increase during the operating lifespan and aging of nuclear power plants. In Korea, reported cases of defects due to dissimilar metal welds include the drain nozzle of a steam generator and RCS hot tube sampling nozzles. Therefore, there is an urgent need to develop a reliable automated nondestructive inspection technique and a system for the inspection of dissimilar metal welds of small diameter nozzles in a high radiation area of a nuclear power plant. In this study, to ensure effective defect inspection of small diameter nozzles (RCS high-temperature tube sampling nozzle) of a nuclear power plant, three different methods were developed. These include: (1) optimum inspection probe design by beam simulation, (2) multi-directions UT optimum inspection technique for the inspection of small diameters of different welded parts, and (3) remote control automatic inspection system. The developed technique and systems have been verified to be suitable for use in the inspection of defects in smaller diameter nozzles in nuclear power plants.

Development of dissolvable technique and equipment for small caliver ammunition (소구경 탄약 분해기술 및 장비개발)

  • Koo, Kyung-Hoe;Lee, Jae-Hwa;Kim, Seok;Jung, Hyun-Su
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1916-1920
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    • 2003
  • By development of dissolvable technique and equipment for warhead, empty cartridge and ammunition in small caliver, pollution of environment and waste of resources problems brought by existing incinerative abrogation can be fundamentally prevented. In addition, Automatic high-speed mechanically dissolving technique using indexing equipment developed in this study makes possible curtailment of manpower and recycling treatment of recources.

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Application Defects Detection in the Small-Bore Pipe Using Infrared Thermography Technique (적외선열화상 카메라를 이용한 원전 소구경 감육배관의 결함 검출)

  • Yun, Kyung-Won;Kim, Dong-Lyul;Jung, Hyun-Chul;Hong, Dong-Pyo;Kim, Kyeong-Suk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.33 no.1
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    • pp.34-39
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    • 2013
  • In the advanced research deducted infrared thermography (IRT) test using 4 inch pipe with artificial wall-thinning defect to measure on the wall-thinned nuclear pipe components. This study conducted for defect detection condition of nuclear small-bore pipe research using deducted condition in the advanced research. Defect process is processed by change for defect length, circumferential direction angle, wall-thinning depth. In the used equipment IR camera and two halogen lamps, whose full power capacitany is 1 kW, halogen lamps and Target pipe experiment performed to the distance of the changed 1 m, 1.5 m, 2 m. To analysis of the experimental results ensure for the temperature distribution data, by this data measure for defect length. artificial defect of 4 inch pipe is high reliability in the 2 m, but small-bore pipe is in the 1.5 m from the defect clearly was detected.

Firing Shock Measurement and Shock Response Spectrum Analysis of Small Arms (소구경 화기의 사격충격 측정 및 충격응답스펙트럼 분석)

  • Lee, Joon-Ho;Choe, Eui-Jung;Yoon, Joo-Hong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.588-593
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    • 2012
  • Nowadays, various forms of electro-optical rifle scope have been developed and used in order to enhance the accuracy of small arms. However, firing shock acceleration has characteristics of pyroshock having a big acceleration value with very short duration time, which the electro-optical scopes should be designed to sustain. In this paper, the firing shock acceleration, which is transmitted to the electro-optical scope, was measured and SRS (Shock Response Spectrum) analysis was performed by using the measured firing shock acceleration. Furthermore, a shock test condition using a drop-table shock tester, which can simulate the actual firing shock acceleration, was devised. The devised shock test condition will be utilized to test the electro-optical scope itself before attaching it to the small arms.

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Usefulness of Small Caliber Catheter Insertion for a Spontaneous Pneumothorax (자연 공기가슴증 치료에서 소구경 도관 흉강삽입술의 유용성)

  • Kim, Eun Jung;Yoon, Sung Ho;Lee, Seung Il;Kwon, Yong Eun
    • Tuberculosis and Respiratory Diseases
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    • v.67 no.1
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    • pp.27-31
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    • 2009
  • Background: The large caliber catheter used in the treatment of pneumothorax causes great damage to the chest wall and organs. The purpose of this study was to prove that the use of a smaller caliber catheter is effective in treating pneumothorax with decreasing admission period and that the recurrence rate of spontaneous pneumothorax is low. Methods: Patients who had been admitted for treatment of first time occurrence of pneumothorax between May, 2004 and December, 2008 were included in the study. The caliber of catheter used this study is 18 Guage (1.2mm). The efficacy of treatment, admission period and recurrence rate of treating pneumothorax with small caliber catheter were compared to the control group using a tube thoracostomy for treatment. Results: The admission period for primary spontaneous pneumothorax was 10.8$\pm$3.6 days for the group (n=68) using tube thoracostomy compared to 4.5$\pm$1.3 days for the group (n=31) using the small caliber catheter (p<0.05). There was no statistically significant difference in recurrence rate between the two groups. Conclusion: The use of a smaller caliber catheter for the treatment of pneumothorax reduces the admission period without a significant increase in recurrence rates.