Kim, Joo Seob;Ahn, Woo Sang;Lee, Woo Suk;Park, Sung Ho;Choi, Wonsik;Shin, Seong Soo
The Journal of Korean Society for Radiation Therapy
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v.26
no.2
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pp.305-312
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2014
Purpose : The purpose of this study is to analyze the mechanical and leaf speed accuracy of the dynamic multileaf collimator (DMLC) and determine the appropriate period of quality assurance (QA). Materials and Methods : The quality assurance of the DMLC equipped with Millennium 120 leaves has been performed total 92 times from January 2012 to June 2014. The the accuracy of leaf position and isocenter coincidence for MLC were checked using the graph paper and Gafchromic EBT film, respectively. The stability of leaf speed was verified using a test file requiring the leaves to reach maximum leaf speed during the gantry rotation. At the end of every leaf speed QA, dynamic dynalog files created by MLC controller were analyzed using dynalog file viewer software. This file concludes the information about the planned versus actual position for all leaves and provides error RMS (root-mean square) for individual leaf deviations and error histogram for all leaf deviations. In this study, the data obtained from the leaf speed QA were used to screen the performance degradation of leaf speed and determine the need for motor replacement. Results : The leaf position accuracy and isocenteric coincidence of MLC was observed within a tolerance range recommanded from TG-142 reports. Total number of motor replacement were 56 motors over whole QA period. For all motors replaced from QA, gradually increased patterns of error RMS values were much more than suddenly increased patterns of error RMS values. Average error RMS values of gradually and suddenly increased patterns were 0.298 cm and 0.273 cm, respectively. However, The average error RMS values were within 0.35 cm recommended by the vendor, motors were replaced according to the criteria of no counts with misplacement > 1 cm. On average, motor replacement for gradually increased patterns of error RMS values 22 days. 28 motors were replaced regardless of the leaf speed QA. Conclusion : This study performed the periodic MLC QA for analyzing the mechanical and leaf speed accuracy of the dynamic multileaf collimator (DMLC). The leaf position accuracy and isocenteric coincidence showed whthin of MLC evaluation is observed within the tolerance value recommanded by TG-142 report. Based on the result obtained from leaf speed QA, we have concluded that QA protocol of leaf speed for DMLC was performed at least bimonthly in order to screen the performance of leaf speed. The periodic QA protocol can help to ensure for delivering accurate IMRT treatment to patients maintaining the performance of leaf speed.
Twelve soybean cultivars were cultivated in the 1/2,000a. Wagner pots with irrigation and without irrigation for 30 days after flowering, and the differences of plant growth and bean yield among cultivars were compared. And to investigate the varietal differences in the rate of photosynthesis under different relative humidity, 6soybean cultivars were cultivated in 1/2,000a. Wagner pot and the rate of photosynthesis of each soybean cultivar at flowering time was measured under the relative humidity of 80, 70, 60, 50 and 40%. The results obtained are summarized as follows; 1. The days to maturity of the soybean cultivars were shortened by non-irrigation treatment. The response of the maturing dates to non-irrigation was significantly different among the soybean cultivars. The days for maturing of Paldal, Danyeob and Eundaedu were delayed 2 days but those of Jangbaek and Tamahomare were delayed about 7 to 8 days under non-irrigation treatment. 2. The stem length, stem diameter, number of nodes of the mainstem, number of branches and number of branch nodes of all soybean cultivars were decreased by non-irrigation treatment. The number of branches and the number of branch nodes were especially severely influenced by non-irrigation treatment. 3. The number of pods per plant and the number of perfect pods was significantly reduced by non-irrigation treatment but the number of imperfect pods was increased. The non-irrigation treatment reduced the number of pods per plant by 58.0% and the ratio of the number of the perfect pods per plant by 46.6% relative to the ordinary cultivation with irrigation. 4. The grain yield of all cultivars was significantly reduced by the non-irrigation treatment, and average grain yield of soybean cultivars cultivated under non-irrigation treatment was 35.9% of that of soybean cultivars cultivated with irrigation. The influence of non-irrigation treatment was lowest in Paldal and significantly high in Tamahomare and Jangbaek. 5. The rate of photosynthesis of soybean leaves was significantly different among cultivars and was also influenced by relative humidity. Ratio of the photosynthetic amount of soybean leaves at 40% RH to the maximum photosynthesis at optimal humidity was 97.2% in Paldal, 96.4% in Danyeob and 88.8% in Baekun. 6. At 40% relative air humidity, highly significant correlations were found among the photosynthesis rate, the amount of transpiration and the respiration rate.
Choi, Hye Sook;Hwang, Yeon Hee;Park, Myung Jae;Kang, Hong Mo
Tuberculosis and Respiratory Diseases
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v.64
no.1
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pp.8-14
/
2008
Background: Acinetobacter infections are difficult to treat as they often exhibit multiple resistance to the antibiotics that are currently available for the treatment of pneumonia. Colistin is active against gram-negative bacteria, including the multiple drug resistant (MDR) Acinetobacter species. However, intravenous administration of colistin was abandoned because of its nephrotoxicity and neurotoxicity. The aims of this study were to examine the efficacy and safety of colistin administered by aerosol in the treatment of pneumonia caused by MDR Acinetobacter baumannii. Methods: We retrospectively reviewed the medical records of patients admitted to the intensive care unit (ICU) from Dec. 2006 to Aug. 2007 who had been diagnosed as suffering from pneumonia due to MDR Acinetobacter baumannii and had been treated with nebulized colistin. Results: 31 patients received aerosolized colistin. The average duration of the treatment was $14{\pm}7$ days and the daily dose of ranged from 225 mg to 300 mg. All patients received concomitant intravenous antimicrobial agents. The average length of the stay in the ICU was $34{\pm}21$ days and in the hospital $58{\pm}52$ days. The overall microbiological eradication was observed in 25 patients (80.6%). 14 of these (56%) were cured, and 11 (44%) were infected with other microorganisms. The overall crude mortality of the ICU was 48%. Nephrotoxicity and significant bronchial constriction did not occur in any patient during neublized colistin treatment. Conclusion: Nebulized colistin may be a safe and effective option in the treatment of pneumonia due to MDR Acinetobacter baumannii. Its role in therapy warrants further investigation in comparative studies.
The present study was conducted to investigate smoking status and the relationship of smoking to hypertension and diseases on 1,504 subjects who were over 30-year-old age in Kyungsan Gun, Kyungpook province, during the period of 12 months from March 1978 to February 1979. The results obtained are summarized as follows: Of 1,504 subjects, 52.2 percent smoked. The percentage of males smoking showed 84.8 and the percentage of females was 30.7. There were no statistically significant differences between the rate of smoking and educational levels. Protestants demonstrated lower rates of smoking compared with other groups. Regarding the age started to smoke, 66.4 precent of male smokers and 16.9 percent of female smokers commenced smoking before the age of 19. In the regard to the average number of cigarettes smoked daily, 45.8 percent of male smokers consumed some 20 cigarettes and 24.1 percent of female smokers consumed some 10 cigarettes. 3.2 percent of male smellers smoked 40 or more cigarettes a day. Alcohol consumption was closely associated with smoking. 90.7 percent of male alcohol drinkers and 60.1 percent of female drinkers smoked. Cigarette smokers have higher rates of ailments than nonsmokers as a whole. The complaints of cough with sputum and shortness of breath revealed higher rates among smokers than among nonsmokers. Frequency of illnesses showed higher for smokers than for nonsmokers. Smokers were more likely than nonsmokers to suffer from chronic obstructive lung diseases such as chronic bronchitis, asthma, and emphysema. Abnormal systolic blood pressure (>160mmHg) and diastolic (>100) revealed significantly higher among smokers than among nonsmokers.
A. The increases moisture contents of grain at R.H $75\%,\; and\; 28^{\circ}C$ 1) The moisture contents of polished rice were $0.4\%,\; 1 \%,\; 3.3\%$ higher than control after 4weeks in which had been infested with 100, 200, 500 individuals of weevil at the beginning. respectively. 2) The greatest moisture contents of polished rice was $16.26\%$ for 500 individual infested grain and the lowest one was $14.86\%$ for the 100 individual weevil infested grain after 4 weeks. 3) The increases in moisture contents of grain were proportionally greater with the size of the weevil population. B. Changes in moisture contents of polished rice at the three levels of cylinder which contain 3kgs of grain and 1000 weevils were infested at the beginning of the experiment. 1) The moisture contents of the grain at all the levels of the cylinder which was not infested with weevil, were consistantly decreased in 12 weeks. 2) The moisture contents of the grain at all the levels of the cylenders which had been infested with 1000 weevils at the beginning of the experiment, were increased except top lovel, that were $15.6\%$ for middle, $41.55\%$ for the bottom levels after 12 weeks. 3) The moisture contents of the grain were greater toward bottom in both weevil infested grain and in control. 4) The moisture content increase might be caused by the respiration of the weevils and deterioration of the grain by microorganisms. 5) There were no tendency to confine the weevils at any definite levels, but as the deterioration of the grain goes on, the weevil moved to top levels of cylinders. 5) The decreases in moisture contents of the grain at the top levels of the cylinders might be caused by diffusion of water to the environment. 7) The differences in temperature at three levels of the cylinder from enviroment were little or negative in control but were greater and positive. and the bottom were higher than top in experimental cylinders. 8) The increases of temperature might be caused by the respiration of the weevil and microorganisms.
Arterial oxygen saturation $(SaO_2)$ instability frequently takes place after systemic-pulmonary shunt without shunt occlusion. We analyzed actual incidence and risk factors for $SaO_2$ instability after shunt operations, and possible mechanisms were speculated on. Material and Method: Ninety three patients, who underwent modified Blalock-Taussig shunt from January 1996 to December 2000, were enrolled in this study. Adequacy of shunt was verified in all patients, either by ensuing one ventricle or biventricular repair later on or by appropriate pulmonary artery growth on postoperative angiogram. Age, body weight, hemoglobin level at operation were 3 day to 36 years (median: 1.8 months), 2.5kg to 51kg (median: 4.1kg) and $10.7\~24.3$ gm/dL (median: 15.2 gm/dL) respectively. Preoperative diagnoses were functional single ventricle with pulmonary stenosis or atresia in 39, tetralogy of Fallot in 38 and pulmonary atresia with intact ventricular septum in 16. Pulmonary blood flow (PBF) was maintained pre-operatively by patent ductus or previous shunt in 64 and by forward flow through stenotic right ventricular outflow tract (RVOT) in 29. $SaO_2$ instability was defined as $SaO_2$ less than $50\%$ for more than 1 hour with neither anatomic obstruction of shunt nor respiratory problem. Result: 10 patients $(10.7\%)$ showed $SaO_2$ instability after shunt operation. After shunt occlusion was ruled out by echocardiogram, they received measures to lower pulmonary vascular resistance (PVR), which worked within a few hours in all patients. Risk factors for $SaO_2$ instability included older age at operation (p=0.039), lower preoperative $SaO_2$ (p=0.0001) and emergency operation (p=0.001). PBF through stenotic RVOT showed marginal statistical significance (p=0.065). Conclusion: $SaO_2$ instability occurs frequently after shunt operation, especially in patients with severe hypoxia pre-operatively or unstable clinical condition necessitating emergency operation. Temporary elevation of pulmonary vascular resistance is a possible mechanism in this specific clinical setting.
Yoon, Hyuk Sung;Choi, In-Lee;Han, Su Jung;Kim, Ju Young;Kang, Ho-Min
Journal of Bio-Environment Control
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v.27
no.1
/
pp.7-12
/
2018
This study was conducted to determine effects of precooling and storage methods on asparagus spears' quality such as changes of fresh weight and color during simulated export distribution. Two types of precooling methods, air cooling and hydrocooling, were applied prior to packaging by comparing with no precooling as a control. Asparagus spears were packed with oxygen transmission rate (OTR) film for modified atmosphere packaging (MAP) and perforated (PF) film for a conventional packaging. All treatments were stored at $8^{\circ}C$ for 20 hours, and subsequently at $4^{\circ}C$ by final storage day, which is simulated distribution temperature condition from Yanggu, Korea to Shimonoseki, Japan. The half cooling time was 12 minutes for air cooling and 15 seconds for the hydrocooling, indicating precooling process of asparagus spears faster with the hydrocooling. Rates of respiration and ethylene production were lowest with hydrocooling. Fresh weight loss was higher, approximately 11%, at the control condition in conventional storage, compared with the MAP, less than 0.5%. Carbon dioxide and oxygen content in the MAP was in the permissible ranges for asparagus spears under recommended CA/MA conditions under both the air cooling and hydrocooling. Ethylene content in the film package was lower with the precooling treatment. Firmness of stems was lowest with the hydrocooling prior to the MAP. Visual quality, off-odor, and hue angle value were best with hydrocooling prior to the MAP. In conclusion, the combination of hydrocooling with the MAP is effective in preserving quality during the export distribution process.
Kim, Young Ok;Kim, Sun Hui;Cho, Chang Yee;Choi, Young Youn;Kook, Jin Hwa;Hwang, Tae Ju
Clinical and Experimental Pediatrics
/
v.46
no.8
/
pp.769-776
/
2003
Purpose : The survival rate of very low birth weight infants(VLBWI) has improved by virtue of specialized neonatal care. This study was performed to analyze the changes in incidence, survival rate and morbidity of VLBWI who admitted to Chonnam National University Hospital from 1996 to 2001. Methods : We enrolled 565 VLBWI, and compared the incidence and the survival rate according to the birth weight or gestational weeks between period I(1996 to 1998) and period II(1999 to 2001). The mortality rate according to the postnatal age, cause of death, morbidity and days of hospital stay were also compared. Morbidity is categorized into 'short term' which is curable until discharge, and 'long term' causing any types of sequelae after discharge. Results : Incidence of VLBWI significantly increased in period II over period I(6.0% vs. 11.0%, P< 0.001). The survival rate also increased in period II(71.8% vs. 80.1%, P<0.05), especially in 1,000 to 1,249 gm of birth weight(P<0.001) and in 28 to 30 weeks of gestation(P<0.001). The most common cause of death was respiratory distress syndrome in period I; however it was sepsis in period II. Although overall and short term morbidity rate increased, long term morbidity and days of hospital stay didn't increase in period II. Conclusion : Although the incidence of VLBWI significantly increased and the survival improved in period II compared to period I, especially in 1,000 to 1,249 gm of birth weight and 28 to 30 weeks of gestation, 'long term' morbidity rate and hospital days didn't increase.
Nam, Sook Hyun;Son, Young Bae;Lee, Bo Lyun;Lee, Jeehun;Ki, Chang-seok;Lee, Munhyang
Clinical and Experimental Pediatrics
/
v.50
no.9
/
pp.868-874
/
2007
Purpose : We performed this study to investigate the perinatal and developmental features of the patients with congenital myotonic dystrophy (CDM) confirmed by the molecular genetic method and the clinical characteristics of their mother, and to identify the relation between the number of CTG repeats and the clinical severity.Methods : A retrospective review of the medical records and the results of the dystrophia myotonica protein kinase (DMPK) gene test was done for the patients who were confirmed as CDM through gene analysis from January 2001 to September 2006. Results : All of the eight patients (male 2, female 6) showed moderate to severe degree of perinatal distress and feeding difficulty associated with profound hypotonia. Three patients had the history of polyhydramnios and two patients had equinovarus deformity. The developmental milestones were delayed in all patients, which improved gradually with age. All of their mothers demonstrated myotonic symptoms and typical myopathic face. The number of CTG repeats in DMPK gene analysis ranged 1,000-2,083, and there was no significant correlation between the number of CTG repeats and the time of walking alone. Conclusion : All patients with CDM presented with severe hypotonia in perinatal period, and developmental delay thereafter, which were improved with age. All of their mothers manifested myotonic symptoms with typical myopathic face, and the identification of such features greatly contributed to the diagnosis of the patients. The number of CTG repeats had no significant influence on the motor development.
Park, Ji Hyun;Lee, Na Young;Kim, Gil Hyun;Jung, Jin Hwa;Cho, Kyung Soon;Kim, Sung Mi
Clinical and Experimental Pediatrics
/
v.46
no.9
/
pp.858-864
/
2003
Purpose : There was a outbreak of aseptic meningitis in Busan, 2002. We report the clinical features and causative viruses. Methods : Two hundred seventy six children with aseptic meningitis who were admitted to the Department of Pediatrics, Maryknoll Hospital between January and December, 2002 were included. CSF, stool and throat swab viral cultures were done in 244 of these children. Results : The male to female ratio was 1.4 : 1. Age of patients varied from five months to fourteen years old. Average age was $5.7{\pm}6.2years$ old and mostly between one and four years.(41.3%) Monthly distribution revealed that the number of patients increased from May to July. The main symptoms were fever, headache and vomiting in this order. Respiratory tract infection symptom was associated from June to July and headache and nausea without fever were characteristically observed in children more than 10 years old from November to December. In peripheral blood examination, leukocytosis(WBC>$10,000/mm^3$) showed in 34.8%, ESR was increased in 56.1%, and CRP was positive value in 61%. Therefore differential diagnosis was difficult through peripheral blood examination. CSF findings revealed mean leukocyte count $86.5{\pm}180.2/mm^3$, protein $41.7{\pm}32.9mg/dL$, glucose $56.4{\pm}9.9mg/dL$. Median hospitalized period was $4.7{\pm}7.2days$ and compared with non-tapping group, hospitalized period was shorter and subsidance of symptoms was faster, therefore antibiotics injection period was shorter in the spinal tapping group. Virus was isolated in 31 cases of 244. The causative agents were echovirus 6, echovirus 9, echovirus 25, coxsakie virus B3, B4. Conclusion : There was an epidemics of aseptic meningitis in Busan, 2002; the causative agent was echovirus 6, 9, 25, coxsakie virus B3, B4.
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