• Journal of Practical Agriculture & Fisheries Research
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• v.9 no.1
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• pp.143-148
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• 2007

• Journal of Bio-Environment Control
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• v.4 no.2
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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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• v.36 no.12
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• pp.985-990
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• 2003

Bilateral diaphragmatic paralysis is a rare disease. It is caused by trauma, cardiothoracic surgery, neuromuscular disorders, corvical spondylosis, and infection. A 60 year-old male patient developed bilateral diaphragmatic paralysis after an on-bloc resection of thymic carcinoma which invaded the right upper lobe, pericardium, superior vena cava and innominate vein. Severe respiratory difficulty developed and ventilator weaning was impossible. We performed bilateral diaphragmatic plication. After the operation, satisfactorily ventilator weaning and sleeping in supine position were possible; therefore, we report this case.

• Journal of Yeungnam Medical Science
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• v.6 no.2
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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.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.4
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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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• v.33 no.3
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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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• v.25 no.6
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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.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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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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• v.28 no.12
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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.

• Proceedings of the SAREK Conference
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• 2005.11a
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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.