• 제목/요약/키워드: Body valve

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Intracardiac a Aortic Foreign Body (심장 및 대동맥내 이물 치험 1례)

  • 방정희;편승환
    • Journal of Chest Surgery
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    • v.30 no.9
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    • pp.932-935
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    • 1997
  • A 50-year-old male patient was admitted due to right ventricular & aortic foreign bodies with ascending aortic pseudoaneurysm. The patient had a history of Kirschner wire fixation of right sternoclavicular joint 3 months ago. Under cardiopulmonary bypass, two K-wires were removed and injured pulmonary valve leaflet and aortic wall were repaired successfully The postoperative course was uneventful and the patient was discharged on the 14th postoperative day.

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Decreased Insulin Secretion in Dogs with Chronic Mitral Valve Insufficiency (만성 이첨판 폐쇄부전증 개에서 인슐린 분비기능 감소)

  • Kang, Jong-Il;Park, Seong-Jun;Lee, Seung-Gon
    • Journal of Veterinary Clinics
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    • v.31 no.3
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    • pp.163-169
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    • 2014
  • Glucose metabolism abnormalities secondary to heart failure, including insulin resistance (IR) and impaired fasting glucose, have been gradually recognized as important prognostic factors in disease progression. However, to date, no study has investigated glucose abnormalities in dogs with chronic mitral valve insufficiency (CMVD). Thus, we hypothesized that glucose metabolism abnormalities due to heart failure may develop in dogs with CMVD. A prospective study was performed on 113 client-owned dogs with variable CMVD severities. Serum insulin, glucagon, fructosamine, and glucose concentrations were measured, and insulin resistance was determined using the homeostatic model assessment (HOMA) score. The serum insulin concentration had a significant inverse association with the heart failure severity. However, there was no significant association between the heart failure severity and fructosamine, HOMA score, and fasting blood glucose. Insulin, fructosamine, and HOMA had a significant positive association with body condition scores (BCS), whereas glucose had no association. This study found that insulin secretion in dogs with naturally occurring heart failure due to CMVD might be compromised as the disease worsens.

Study on the performance improvement of a Main Oxidizer shut-off Valve (CC 산화제 개폐밸브 성능향상에 관한 연구)

  • Bae, Young-Woo;Kim, Do-Hyung;Hong, Moon-Geun;Lee, Soo-Yong;Jang, Ki-Won
    • Aerospace Engineering and Technology
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    • v.9 no.2
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    • pp.63-72
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    • 2010
  • MOV(Main Oxidizer shut-off Valves) control the combustion of launch vehicle systems by the supply and the isolation of liquid oxygen to a main combustion chamber in launch vehicle systems. Moreover, the MOV should secure a constant flow rate of liquid oxygen for combustion instability in the steady operational state. Although it has been showed that a EM(Engineering Model) with a high discharge coefficient value compared with the TM(Technology Model) fills the overall performance requirements, additional design modifications in some critical parts of the EM were conducted to improve the performance. The configurations of the pressure-control body, the middle flange, and the rips of the inlet body of the EM were modified and the performance tests have been performed with test models. Consequently, the intended improvements have been verified by the performance tests.

Tolerance Accumulation Analysis of ECV by Monte Carlo Simulation (몬테칼로 시뮬레이션을 이용한 ECV의 공차누적분석)

  • Wang, Xiang;Kang, Eunji;Chang, Heeseok;Lee, Soojin;Choi, Dukjun;Guk, Musung;Hong, Taeho;Kang, Heejong;Ahn, Youngjae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.1
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    • pp.85-94
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    • 2014
  • Tolerance accumulation has serious effect on the performance of an assembled body. This paper proposes the method which analyzes tolerance accumulation using Monte Carlo Simulation. This method can predict tolerance distribution of fully assembled body using the dimensional tolerance distribution of each part to be assembled. In this analysis, it is assumed that the tolerance of each part has the nominal distribution or uniform distribution. This analysis method is applied to ECV(External Control Valve), and the accumulated tolerance of the fully assembled ECV is obtained from the analysis. The results show that initial tolerance given to each part do not meet the design requirement of ECV. Hence, the tolerances of each part are modified and the additional analysis with the modified tolerances yields the results which satisfy the design requirements of ECV.

Implementation of Wireless Micro-Magnetic Detection System in the Conveyer Belt (컨베어 이송장치에서의 무선 미소자기감지 시스템 구현)

  • Lee, Young-Dong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.12
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    • pp.2975-2981
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    • 2014
  • Micro-magnetic detection system is used to detect small particles in an automatic transmission valve body, which signal noise and time-delay may occurs in process of signal transmitting and filtering. In this paper, we present the design and implement of a micro-magnetic detection system based on wireless sensor networks in conveyer belt. Micro-magnetic detection system consists of five modules which are magnetic sensor detector, signal processing unit, wireless sensor networks, system control unit and system monitoring unit. Our experimental results show that the proposed wireless micro-magnetic detection system improves both accuracy and time delay compared to the wired system; therefore, it may apply for wireless micro-magnetic detection system by analysis of packet reception rate.

A study on the basic design of bypass valve using CAE technology (CAE 기반 바이패스 밸브 기본설계에 대한 연구)

  • Oh, Jae-Won;Min, Cheon-Hong;Cho, Su-Gil;Park, Sang-Hyun;Kang, Kwan-Gu;Kim, Seong-Soon;Hong, Sup;Kim, Hyung-Woo
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.7
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    • pp.663-670
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    • 2016
  • This paper introduces the concept of the computer-aided engineering(CAE) design method for a bypass valve in a system that is used for the safe lifting of mineral resources in deep-seabed mining. Although the bypass valve has a simple mechanism, its design is very difficult because of various influencing factors. This equipment, which has a complex design process, should be developed by CAE-based design method. The method can perform the design, design verification, and virtual experiment at the same time. In this study, the CAE-based method for the design of the bypass valve has been developed using fluid dynamics, multi-body dynamics, and optimization method.

Evaluation of Serum Symmetric Dimethylarginine Concentrations in Dogs with Chronic Mitral Valve Insufficiency

  • Kim, Nam-Kyun;Song, Joong-Hyun;Yu, Do-Hyeon;Hwang, Tae-Sung;Lee, Hee-Chun;Jung, Dong-In
    • Journal of Veterinary Clinics
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    • v.34 no.5
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    • pp.313-317
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    • 2017
  • Symmetric dimethylarginine (SDMA) is a new renal biomarker for kidney function. It is almost exclusively eliminated by renal filtration. The purpose of this retrospective study was to evaluate the changes in serum ceatinine (CREA), blood urea nitrogen (BUN) and SDMA concentrations in dogs with chronic mitral valve insufficiency (CMVI), according to the severity of CMVI. The evaluation of the severity of CMVI was performed according to the American College of Veterinary Internal Medicine (ACVIM) classification of heart failure. The dogs were classified into two groups: group 1 (ACVIM B; n = 11) and group 2 (ACVIM C; n = 15). In dogs with advanced CMVI, the serum SDMA concentrations were significantly increased above the normal reference range and were independent of body weight (BW), systolic blood pressure (SBP), or sex. No dog in either group had higher serum CREA concentrations than the upper limit. The serum SDMA concentration may be a better renal marker than serum CREA concentrations for the early diagnoses of renal dysfunction in dogs with CMVI.

Operating Characteristics of the Flow Control Valve for the Radiant Heating System (복사난방용 유량조절 밸브의 작동특성 연구)

  • Pyo, Jin-Soo;Jang, Choon-Soo;Choi, Kwang-Suk;Kim, Youn-Jea
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.552-557
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    • 2007
  • Due to the recent improvement of living standard of residential buildings, the requirements of the thermal comfort and energy saving in heating system have been raised. The radiant floor heating system has been widely used as a residential heating method, which has been modernized to use hot water running into the tubes embedded in the floor structure. The uniform flow distribution is very important factor for a radiant floor heating system such as a blood vessel system in human body. Therefore, it is necessary to investigate the operating characteristics to develop an optimal radiant floor heating system. In this study, numerical analyses were carried out, using a commercial CFD code, FLUENT, to obtain the velocity distribution under steady, three-dimensional, standard k-$\varepsilon$ model and no-slip condition. Results are graphically depicted with various parameters.

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Dynamic Performance of Natural Gas Injection Valve for Heavy-Duty CNG Dual Fuel Engine (대형 CNG 혼소 엔진용 천연가스 분사밸브 동특성 연구)

  • Kim, Yong-Rae;Choi, Young
    • Journal of the Korean Institute of Gas
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    • v.21 no.5
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    • pp.9-15
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    • 2017
  • Natural gas fuel has known to be very promising in terms of abundancy and economic value. Therefore it is widely treated as research topics in a variety field of production, storage and utilization. Natural gas has become one of the major sources for the power generation by using internal combustion engines(ICE). Development of natural gas fuel injection device should be preceded to realize a reliable natural gas fuel supply system for a MW class power generation reciprocating ICE. In this research, an injection valve which consists of solenoid and body part with a moving plate was designed and its dynamic performance was experimented in the engine-like environment. Displacement length and diameter of an armature and diameter of a solenoid coil were tested at former study. In this research the effect of materials of solenoid core, size of main housing inlet and supply gas pressure are examined.