• Proceedings of the KOSOMBE Conference
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• v.1998 no.11
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• pp.149-150
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• 1998

We have developed electrically driven portable ventilator and evaluated through in-vitro and in-vivo test. Ventilator is consists of DC servo motor(Kollmorgen), piston and ball screw, sensing system, power system with backup battery and micro controller. For the precise and stable volume control, the dynamic brake and the PI speed control loop is employed. The main functions are as followers; control, control+sigh, control/assist, control/assist+sigh and SIMV. The animal experiment showed stable performance when it is operated in control mode.

• Journal of Chest Surgery
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• v.29 no.5
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• pp.589-592
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• 1996

We report two cases of the thoracoscopic thymectomies for patients of myasthenia gratis with tracheostomy (Osserman's Group-ll-C-1). The Irst case was 47-year-old male wlth generalized myas- thenia gravis who was under the mechani al ventilator therapy with tracheostomy. The second case was 60-year-old male with deteriorating generalized myasthenia gratis after the mechanical ventilator therapy. We decided to resect the thymus by vldeo-assisted thoracoscopy to prevent the ouurrence of postoperative complications, especially mediastinitis because all two cases were under tracheostomy state. We could stop the mechanical ventilator therapy on the postoperati'fe 16th day and 3rd day respect- ively and they were recovered without mediastinitis. So we concluded that video-assisted thoracoscopic thymectomy is a good alternative surgical method for myasthenia gratis patients with tracheostomy.

• Journal of Korean Critical Care Nursing
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• v.10 no.2
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• pp.14-23
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• 2017

Purpose: The purpose of this study was to evaluate the effectiveness of a ventilator-associated pneumonia (VAP) bundle. Methods: This was a retrospective study that was carried out between June 2010 and October 2015. In this study, 3,224 intubated patients were included. The VAP bundle which was applied to Group 1 patients (n=470) included head-of-bed elevation to 30 degrees, cuff pressure monitorization, prophylaxis of peptic ulcer, and prophylaxis of deep vein thrombosis. The VAP bundle for Group 2 patients (n=1,914) included all the elements of the VAP bundle for Group 1 patients and one additional element which was oral care with 0.12% chlorhexidine. The VAP bundle for Group 3 patients (n=870) added sedative interruption and assessment of readiness to extubate to the VAP bundle for Group 2. Results: The numbers and incidences of VAP were significantly different among the three groups. Moreover, there were significant differences among groups in ICU length of stay and mortality. Conclusion: Three different VAP prevention bundles made different effects in patient outcomes.

• Perspectives in Nursing Science
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• v.9 no.2
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• pp.119-126
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• 2012

Purpose: The purpose of this study was to evaluate the effects of mechanical ventilation simulation on the clinical judgment and self-confidence of nursing students. Methods: This study was a quasi-experimental study. From one university, 118 undergraduate nursing students participated in this study. Sixty students were in the intervention group, and fifty-eight students were in the control group. A simulation scenario utilizing a high-fidelity human simulator focusing on nursing care for patients with a mechanical ventilator was developed for this study. Data were collected with a self-report survey method before the intervention, right after intervention, and two weeks later. Results: Students in the intervention group showed significantly higher increases in clinical judgment and self-confidence than those in the control group at the immediate posttest. Moreover, 2 weeks later, the increase in clinical judgment and self-confidence from the pretest among the intervention group was significantly larger than those in the control group. Conclusion: Utilizing simulation education focusing on patients with a mechanical ventilator may contribute to training more competent nurses in the area of critical care nursing. It may also serve to provide a better critical care environment for the safety and health of patients.

• Journal of Power Electronics
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• v.10 no.2
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• pp.187-193
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• 2010

This paper proposes a cooling system using thermoelectric elements for improving the output of building integrated photovoltaic (BIPV) modules. The temperature characteristics that improve the output of a BIPV system have rarely been studied up to now but some researchers have proposed a method using a ventilator. The efficiency of a ventilator depends mainly on the weather such as wind, irradiation etc. Because this cooling system is so sensitive to the velocity of the wind, it is unable to operate in the nominal operating cell temperature (NOCT) or the standard test condition (STC) which allow it to generate the maximum output. This paper proposes a cooling system using thermoelectric elements to solve such problems. The temperature control of thermoelectric elements can be controlled independently in an outdoor environment because it is performed by a micro-controller. In addition, it can be operated around the NOCT or the STC through an algorithm for temperature control. Therefore, the output of the system is increased and the efficiency is raised. This paper proves the validity of the proposed method by comparing the data obtained through experiments on the cooling systems of BIPV modules using a ventilator and thermoelectric elements.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.11
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• pp.5284-5291
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• 2012

This research is to develop the Web-Based Ventilator Management Education Program that reflects the needs of nursing site nursing which is intended to help nursing duties. ISD model-building process has been developed for the analysis, design, development, operation, and evaluation of methods. The education program was developed from April to July 2011, and SPSS 18.0 was used for data analysis. The analysis stage, document review and requirement analysis, content analysis, learner analysis, technology and environment analysis have been executed. Through the processes, higher education requirements for the practical ventilator, a large number of subjects under the age of 30, and the career of less than 3 years of ICU were searched. At the design stage, the education content that was presented by the content expert group was executed in information design, mutual interaction design, synchronization design through discussion with program experts. At the development stage, author made the story flow and gathered data and integrated it through the review of related document and data. At the operation and evaluation stage, author executed the developed program and revised and supplemented it on the basis of the evaluation results through the experts and subjects evaluation. The Web-Based Ventilator Management Education Program could contribute to the improvement of nursing because the program has been developed to reflect the diverse needs of nursing practice in the process of building program.

• Clinical and Experimental Pediatrics
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• v.51 no.11
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• pp.1179-1184
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• 2008

Purpose : Pulmonary interstitial emphysema (PIE) primarily occurs in preterm infants suffering from respiratory distress syndrome (RDS) and kept under mechanical ventilator care. Therefore, this study aimed to examine various risk factors for PIE, to identify conditions that can decrease the possibility of PIE development. Methods : PIE classification was conducted for 183 patients diagnosed to have RDS and receiving mechanical ventilator care with pulmonary surfactant between March 2000 and February 2007. The characteristics of each patient were analyzed through retrospective examination of their medical histories. Results : Among 183 patients, 17 had PIE; all factors, including birth weight, gestational age, RDS grade III or above, chorioamnionitis, and premature rupture of membranes, were statistically significant (P<0.05). The period of mechanical ventilator use was statistically significant, but the peak mean airway pressure and peak partial pressure of inspired oxygen were not. PIE mainly occurred on the right side or both sides rather than the left side and mostly developed within 72 h. The PIE group showed higher mortality rate than the control group, and the major cause of mortality was pneumothorax. Conclusion : Risk factors for PIE in infants suffering from RDS and kept under mechanical ventilator care include low gestational age, low birth weight, chorioamnionitis, and premature rupture of membranes. If any risk factors are noted, the infant must be observed closely for at least 72 h after birth.

• Journal of Biomedical Engineering Research
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• v.45 no.1
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• pp.10-19
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• 2024

The purpose of this study is to conduct a summative evaluation of the usability of a general-purpose ventilator to determine whether it can be used for its intended purpose in the intended environment by the intended user and to find possible errors in use. The importance of ventilators has increased due to the accelerated aging of the population and the impact of the pandemic. In addition, patients who require ventilators are often in critical condition, so even a small error in use can be fatal. Therefore, it is important to ensure that the ventilator has sufficient stability and can be used satisfactorily without inconvenience to the user. In this study, we conducted a usability test with 17 respiratory nurses with more than 3 years of experience using the ventilator. We analyzed the task success rate, satisfaction, and opinions of the intended users while going through a total of 17 scenarios. Satisfaction was captured through an ASQ questionnaire and subjective opinions were captured through a detailed opinion questionnaire. The results showed a high level of satisfaction with an average score of 6.3 for the use scenarios. Evaluators expressed satisfaction with the overall visibility and versatility of the features, but noted that improvements were needed for calibration tasks with low task success rates. As the calibration method is different from other equipment, it was suggested that specific explanations of the calibration method and the picture that appears when calibrating are needed, and that if relevant training is provided, the equipment can be used without problems. If the usability evaluation is not limited to securing efficiency and satisfaction from the intended users, but also continuously receives feedback from users to prepare for use in emergency environments such as pandemic situations, it will be very helpful to seize opportunities such as emergency authorization in future situations, and ultimately contribute to patient safety by reducing use errors.

• 월간산업보건
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• s.260
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• pp.65-68
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• 2009

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.34 no.1
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• pp.28-36
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• 2005