• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.9
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• pp.608-613
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• 2008

The purpose of the present paper is to investigate the effect of outdoor weather conditions on the performance of a heat recovery ventilator. Experiments have been performed by varying outdoor temperature/humidity conditions with the indoor conditions fixed at the standard conditions by KARSE. Results indicate humidity efficiency shows larger uncertainties than temperature efficiency in general. With the heat generation by an internal fan removed, the modified temperature efficiency remains almost constant regardless of the indoor-outdoor temperature difference. The enthalpy efficiency can have very large or negative values in case the outdoor conditions are in the vicinity of the indoor enthalpy line. The direction of heat flow, in such a case, can be opposite to that of moisture flow between two air streams. Discussions are included about various interesting features of the psychrometric processes taking place in a heat recovery ventilator.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.25 no.10
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• pp.529-533
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• 2013

Heat-recovery ventilators are being adopted in most newly built apartment houses for energy reduction and indoor environment improvement. In winter, however, the dew condensation resulting from the difference between the indoor and outdoor temperatures may reduce the ventilator's performance and threaten the health of indoor residents. This study analyzes the occurrence of dew condensation according to the ventilator's operational conditions and the changes of temperature and products. The experimental results show that condensations is formed at $26^{\circ}C$ and 60%R.H, which is an unfavorable climatic condition, and when the damper is not closed tightly. Therefore it is important to ensure damper performance to prevent back flow.

• Journal of Korean Biological Nursing Science
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• v.9 no.1
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• pp.71-84
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• 2007

Purpose : The Purpose of this study was to identify the physiological, psychological factors to successful weaning of mechanical ventilation in ICU patients. Method: Data was collected by interview with the use of questionnaires from 70 ICU patients, who were mechanically ventilated more than 3days at Y university medical center. Data was analyzed with descriptive statics, t-test, and $x^2$ test, and Pearson Coefficient Correlation using SPSS WIN 12.0 program. Result: ICU patients with mechanical ventilator during weaning period reported high levels of anxiety, moderate levels of stress, and fatigue. The physiological, psychological factors influencing ventilator weaning success were RSBI(p=0.007), stress(p=0.009), anxiety(p=0.020), depression(p=0.040), fatigue(p=0.001), and dyspnea(p=0.010). The RSBI factor was shown to have positive correlations with ventilator care periods, $PaCO_2$, and fatigue. Dyspnea was also positively correlated with stress, anxiety, depression, and fatigue. Conclusion: This study suggests that RSBI, stress, anxiety, depression, fatigue, and dyspnea are significant factors to successful weaning from mechanical ventilation.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.10a
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• pp.323-326
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• 2008

This paper presents a cooling system using thermoelectron for improving the output of BIPV module. The temperature characteristic in regard to improving the output of BIPV system has rarely teen studied up to now but some researchers only presented the method using a ventilator. The cooling system efficiency of BIPV module applied to a ventilator mainly depends on the weather such as wind, insolation etc. Because the cooling system of BIPV module using a ventilator is so sensitive, that is being set off by wind speed at all time but is unable to operate in the NOCT(Nominal Operating Cell Temperature) which is able to make the maximum output. The paper presents the cooling system using thermoelectron so as to solve such problems. The temperature control of thermoelectron can be controlled independently in the outside environment because that is performed by micro-controller. The temperature control of thermoelectron, also, can be operated around NOCT through algorithm of the temperature control. Therefore, outputs of the whole system increase and the efficiency rises. The paper demonstrates the validity of proposed method by comparing the data obtained through a experiment of the cooling method of BIPV using a ventilator and proposed thermoelectron.

• Journal of Korean Critical Care Nursing
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• v.4 no.2
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• pp.39-46
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• 2011

Purpose: The purpose of this study was to examine the effect of oral hygiene for ventilator-associated pneumonia (VAP) incidence. Methods: This study was used a nonequivalent control group posttest design. This study was performed in two groups, experimental group and control group. The experimental group (36 patients) had performed oral care for 6 times a day. The control group (39 patients) had followed and 3 times oral care a day. Participants were patients of 20 years of age or older on mechanical ventilation more than 48 hours from July 5 to October 31 in 2007 at the medical and surgical ICU of C university hospital. Results: VAP occurred in 5 cases in the control group, while only 1 case occurred in the experimental group. Incidence for 1000 ventilator day was 12.59 in the control group and 2.18 in the experimental group. Conclusion: Nursing intervention of 6 times oral care a day proved to decrease incidence of VAP. A guideline should be made using the above nursing intervention for the critical ill patients receiving mechanical ventilation.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.20 no.1
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• pp.5-15
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• 2013

Purpose: This study aimed to investigate the self-care education experience, self-care performance, and home care service needs of patients with rare and incurable diseases who use a home ventilator. Methods: From2 ventilator rental companies and 5 hospitals, records of 162 subjects were collected to obtain data regarding self-care education experience (23 items) and home care service needs (25 items). Results: Of the subjects, 65.4% were male and 55.6% had a myotrophic lateral sclerosis. The items with the highest and lowest levels of self-care education experience were "using the ventilator"(94.0%) and "community-available resource information"(27.0%), respectively. Meanwhile, self-care was performed well in terms of "personal hygiene"(59.6%) but not performed well in "community-available resource information"(23.7%). "Health status assessment" had the highest need(88.2%) of home care services. Generally, the need of home care services was higher for the patients using invasive ventilators than that for those using non-invasive ventilators. Conclusion: Home care nurses need to not only provide physical care for the patients but also strengthen their roles of enhancing patient access to and utilization of various community resources to provide systematic and individualized training and care.

• Asian Pacific Journal of Cancer Prevention
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• v.15 no.14
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• pp.5787-5791
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• 2014

Background: With increasing survival periods and diversification of treatment methods, treatment of critically ill cancer patients has become an important factor influencing patient prognosis. Patients with cancer are at high risk of infections and subsequent complications. This study investigated the incidence and factors contributing to the development of ventilator-associated pneumonia (VAP). Materials and Methods: This retrospective study investigated the incidence of VAP and factors leading to infection in patients admitted to the intensive care unit (ICU) of a cancer center from January 1, 2012 to December 31, 2013. Results: The incidence of VAP was 2.13 cases per 1,000 days of intubation, and 13 of 288 patients (4.5%) developed VAP. Lung cancer was the most common cancer associated with VAP (N=7, 53.9%), and longer hospital stays and intubation were associated with increased VAP incidence. In the group using a "ventilator bundle," the incidence was 1.14 cases per 1,000 days compared to 2.89 cases per 1,000 days without its use; however, this difference was not statistically significant (p=0.158). Age (${\geq}65$, OR=5.56, 95% confidence interval [CI]=1.29-23.95), surgery (OR=3.78, 95%CI=1.05-13.78), and tracheotomy (OR=4.46, 95%CI=1.00-19.85) were significant VAP risk factors. The most common causative organisms were methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa (N=4, 30.8% each), followed by Acinetobacter baumannii and Candida albicans (N=2, 15.4% each). Conclusions: The incidence of pneumonia among critically ill cancer patients is highest in those with lung cancer, but lower than among non-cancer patients. The length of hospital stay and time on mechanical ventilation are important risk factors for development of VAP. Although not statistically significant, "ventilator bundle" care is an effective intervention that delays or reduces incidence of VAP. Major risk factors for VAP include age (${\geq}65$ years), surgery, and tracheostomy, while fungi, gram-negative bacteria, and multidrug-resistant organisms were identified as the major causative pathogens of VAP in this study.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.6
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• pp.468-475
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• 2016

The purpose of this study is to investigate the acoustic problems of the conventional heat recovery ventilator and to suggest the methods of noise reduction from a heat recovery ventilator according to the installed location. The noise level, in this study, was measured and discussed as the parameters of size, wind volume and sound absorbing duct length for a heat recovery ventilator based on domestic and international related standards. It is found, as a result, that almost all of noise levels from the small and medium heat recovery ventilators without the sound absorbing duct in the anechoic chamber were higher than the noise standard value of 50 dB(A) regardless of the wind volume, and the noise levels went down when a sound absorbing duct was installed. In addition, the sound pressure level relative to frequency bands according to the length of sound absorbing duct was generally decreased, as the length of sound absorbing duct in the small and medium heat recovery ventilators was big, and the sound pressure level was generally increased, as the wind volume was great.

• Child Health Nursing Research
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• v.18 no.1
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• pp.9-18
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• 2012

Purpose: This study was conducted to analyze factors affecting readmission of children with home ventilator care. Methods: To collect patient data, a retrospective chart review was done of medical records of children admitted between June 1, 2007 and May 31, 2010 at one children's hospital located in Seoul. During that period 30 children were discharged with a home ventilator. Results: Twenty-one of these children had a total of 63 readmissions during the study period, averaging 2.1 readmissions per child with a mean duration of hospitalization of 7.4 days. Children with nasogastric tubes were more frequently readmitted (t=7.232, p=.012) and duration of hospitalization was significantly longer (t=4.761, p=.038). Children who had cardio-pulmonary comorbidity were more frequently readmitted and had longer hospitalization than children without comorbidity (t=5.444, p=.027). When home ventilator assisted children were admitted via emergency room, they were hospitalized longer (t=14.686, p=<.001). Cardio-pulmonary morbidity and readmission via ER explained 38.1% of variation for readmission. Feeding method explained 15.0% of variation in length of hospitalization. Conclusion: The results suggest that health care providers must give individualized education on home ventilator care to parents with children who are at risk for readmission due to cardio-pulmonary comorbidities, nasogastric tube, or readmission via ER.

• Journal of the Korea Organic Resources Recycling Association
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• v.22 no.3
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• pp.60-67
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• 2014

Exhaust system used in toilet and cooking place of high riser public house is roof fan of two basic types : natural roof ventilator and natural/forced roof ventilator. Natural/forced roof ventilator has a motor in the rotary shaft. There are many high riser public house in Korea. These buildings were not viewed as being major contributors to exhaust pollutants producted in indoor. It was because many engineers thought that exhaust in high riser building depend on stack effect. This study investigates on stack pressure determined by exterior pressure and the difference pressure control in exhaust stack used in high riser public house. This paper focuses mainly on the effect of the time interval for power supply of motor installed in roof fan with function of natural wind velocity and of exhaust air volume of toilet. It is observed there are higher exhaust efficiency than the existing natural roof ventilator.