• 현장농수산연구지
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• 제9권1호
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• pp.143-148
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• 2007

• 생물환경조절학회지
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• 제4권2호
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• pp.232-239
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• 1995

This study was carried out to get required torque data needed to design and develop a roll-up ventilation system in a pipe-constructed plastic film green-house. The results obtained from this study are as follows : 1. The required torques of a roll-up ventilation system in greenhouse are the functions of its length. The torques should multiplied by the conversion coefficients (2.0 in ceiling vent, 1.8 in side vent) in case of application. 2. In constructing pipe-constructed plastic film greenhouse, a shaft pipe is the largest essential element in roll - up shaft weight constitution which have an effect on the required torques. Therefore, the pipe should be light using nonferrous materials like aluminum alloy. 3. A planetary reduction ventilator of differential ring gear type is suitable for a roll-up ventilation system, because it can make high efficient reduction just using the first step shift.

• Journal of Chest Surgery
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• 제36권12호
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• pp.985-990
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• 2003

양측성 횡격막 마비는 드문 질환으로 외상, 심흉부 수술, 신경근육질병, 경부척추굳음증, 감염이 원인이 될 수 있다. 우폐상엽, 심낭, 상대정맥과 무명정맥을 침범한 흉선암의 적출술을 시행한 후 60세 남자 환자에서 양측성 횡격막 마비가 발생하였다. 심한 호흡곤란이 발생하였고, 인공호흡기 이탈이 불가능하였다. 양측 횡격막 주름성형술을 시행하였고, 인공호흡기 이탈 및 누운 자세에서 수면이 가능하게 되어 만족할 만한 결과를 얻었기에 문헌 보고하는 바이다.

• Journal of Yeungnam Medical Science
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• 제6권2호
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• pp.63-70
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• 1989

This paper describes to design and to examine the mechanical characteristics of high frequency jet ventilator. The device consists of Phase lock loop(PLL) system, solenoid valve driving control part and Air regulating system. This study is carried out by changing several factors such as endotracheal tube(E.T. tube)diameter, injector cannula diameter, 1%, and frequency(breaths/mim.) having direct effects on the gas exchange as well as parameters of the entrained gas by venturi effects, so as to measure the tidal volume and minute volume. This system characteristics were as follows : 1) Frequency : 6-594bpm 2) Inspiration time : 1-99% 3) Variance of input air pressure : 1-30PSI.

• 설비공학논문집
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• 제28권4호
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• pp.165-170
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• 2016

Long-term performance of the enthalpy exchange element is a topic of current interest due to the concern of possible performance degradation over time. In this study, a 350 CMH enthalpy recovery ventilator equipped with an enthalpy exchange element was installed in an office room, and the performance has been traced over the past 5 years. The appearance, overall dimension, thermal performance, leakage ratio and anti-bacterial performance were checked annually. Results showed that the change in thermal performance (sensible, latent and enthalpy efficiency) was negligible with periodic cleaning with an air gun. However, the leakage ratio increased with time, measuring 7.3% after 5 years. Anti-bacterial test revealed that no bacteria were found during the test period. The largest change in the dimension occurred at the middle location of the element, although the change was less than 2% of the initial value.

• Journal of Chest Surgery
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• 제33권3호
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• pp.257-261
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• 2000

Pulmonary arteriovenous fistula can occur in a variety of clinical situations including liver diseases, infections, metastatic carcinomas, systemic disorders, and after the palliation of congenital heart diseases. A 72-day-old male infant with Tetralogy of Fallot and pulmonary atresia underwent surgical correction without difficulty. However, ventilator weaning in the ICU failed initially because of an unexplained postoperative hypoxemia(FiO2: 0.8, PaO2: 40 mmHg, SaO2: 80∼90%). Postoperative follow-up lung perfusin scan at postoperative 15 days showed right-to-left shunt(33.6%) and ventilator weaning was performed on the 20th day after the operation (FiO2: 0.4, PaO2, 50mmHg, SaO2: 86.9%). Arterial oxygen saturation under room air was 80∼85% at 7 months postoperatively. One and half year follow-up lung perfusion scan showed decreased amount of right-to-left shunt (11.2%). We report a case with a review of the literatures.

• Journal of Chest Surgery
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• 제25권6호
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• pp.581-587
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• 1992

Tracheoesophageal fistula[TEF] is a rare but life-threatening lesion that may occur from ventilation with a cuffed tube. It occurs most frequently when an inlying esophageal tube is also being used-usually for feeding purposes. The mechanism of injury appears to be pressure experted on the tracheal wall by the cuff, which then compresses the "party wall" of the trachea and esophagus against the foreign body that lies in the esophagus. The patient was 32 years old female who had been receiving a treatment of respiratory failure induced by postoperative sepsis with assist ventilator and nasogastric tubal feeding. Sudden attack of abdominal gas distention and massive drainage of gas through N-G tube were developed during assist ventilation in that patient, so we diagnosed as tracheal stenosis with a tracheoesophageal fistula induced by prolonged endotracheal intubation We performed tracheal reconstruction and primary closure of perforated esophagus after weaning ventilator. The postoperative course was uneventiful.eventiful.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.105-108
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• 1997

In this paper, we developed a portable electrical ventilator that could be controlled by the microcontroller. Control algorithm of motor drive t programmed with ASM96 assembly language software. We evaluated the system by measuring the parameters such as motor speed, feedback gain and overall specification.

• Journal of Chest Surgery
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• 제28권12호
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• pp.1160-1166
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• 1995

From 1980 through 1993, sixty one patients having traumatic flail chest were analysised retrospectively at the Department of Thoracic and Cardivascular Surgery, Chonbuk National University Hospital. There were 47 men and 14 women, mean age, 49.3 years, age range 4 to 82 years. The most common mode of trauma was automobile accident, common combined other organ injuries were skeletal injury [ 36 patients and neurologic injury [ 20 patients . In the mode of treatment, ventilator therapy was done in 34 cases and operative stabilization was done in 18 cases [ Kirschner or steel wire: 9 cases, Judet`s strut: 9 cases . Sixteen patients died [26 % . The main factors associated with fatal outcome were shock [ p < 0.002 , head injury [ p < 0.005 , and more than 50 years of age [ p < 0.05 . In fatal cases, 14 patients died during in ventilator therapy [ 14/34, 41 % and 2 patients died following operative stabilization of chest wall [ 2/18, 11 % .The overall cause of death was septicemia, ARDS, ARF, hypovolemic shock and hypoxic brain damage.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.88-93
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• 2005

In this paper, the heat and fluid flow analysis in a shaft of an apartment has been performed in order to investigate the pressure distribution inside a shaft considering both natural and forced convection. The present CFD approach can be used in estimating the capacity of roof ventilator of an apartment reasonably. Furthermore, flow patterns inside a shaft have been examined for some operating conditions of hood system.