• Radiation Oncology Journal
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• v.6 no.2
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• pp.269-276
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• 1988

Eight patients with intracranial tumors or arteriovenous malformation (AVM)s which were less than 3 cm in diameter were treated by a technique of stereotactic radiotherapy during the 4months period from July 1988 through October 1988 at the Division of Radiation Therapy, Kang-Nam St. Mary's Hospital, Catholic University Medical College. The patients were diagnosed as AVMs in 3 cases, acoustic neurinoma, craniopharyngiom (recurrent), hemangioblastoma, pineocytoma, and pituitary microadenoma in each case. There are several important factors in this procedure, such as localization system, portal, field size, radiation dose, and perioperative supportive care. It is suggested that stereotactic radiotherapy may be peformed safely with a radiation dose of 12-30 Gy. So this nonivasive procedure can be used to treat unresectable intracranial tumors or AVMs. Of these, clinical symptoms had been regressed in AVMs in 2 cases at 3 months and 2 months after Stereotactic radiotherapy, one of whom was confirmed slightly regressed on the follow-up angiogram. And also craniopharyngioma and pineocytoma was minimally regressed on 3 month follow-up CT.

• Journal of Chest Surgery
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• v.29 no.7
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• pp.728-733
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• 1996

Since thoracoscopy was originally described by Jacobaeus in 1922, video-assisted thoracic surgery has been used to treat many thoracic diseases. From June 1994 to July 1995, 35 patients with spontaneous pneumothorax'underwent video-assisted thoracic sugery as experimental group, and same number of patien:s with blob resection through mid-axillary thoracotomy as co trol group in our hospital.'The authors compared the clinical results between each group. 1. The sex distributions were 28 males, 7 females in experimental group and 30 males, 5 females in control group. The mean age of experimental group was 28.5 $\pm$ 12.6 years of age and that of control group was 2).9 $\pm$ 6.3 years of age. 2. The operative times were 98.8$\pm$ )9.3 minutes in experimental group and 103.6$\pm$ )2.6 minutes in control group. ). The duration of chest tube indwelling at postoperative period was 2.60 $\pm$ 0.98 days in experimental group, 4.80 $\pm$ 2.08 days in control group (P< 0.01). The periods of postoperative hospitalization were 17 $\pm$ 1.22 days in experimental group and 6.69 $\pm$2.52 days in control group. The durations of post-oper- ative chest tube indwelling and hospital stay in experimental group were shorter than in control group (P< 0.01 respectively). 4. The injection of analgesics at postoperative period was less in experimental group than control group. At the operative day and postoperative 1 st and 2nd day, the number of injections were respectively 1. 57$\pm$0.74, 1.97 $\pm$0.70 and 1.00$\pm$0.68 times/person in experimental group, 2.23 $\pm$0.60, 2.60 $\pm$0.67 and 2. 17$\pm$0.76 times/person in control group(P<0.01 respectively). The mean duration and dose of postoperative analgesic injection were 2.48$\pm$ 1.01 days/person and 4.88 $\pm$3.70 ampules/person in experimetal group, 3.70$\pm$ 1.40 days/person and 8.94 $\pm$4.21 ampules/person respectively (P< 0.01, p<0. 01).

• Journal of Chest Surgery
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• v.42 no.2
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• pp.201-205
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• 2009

Background: Cryosurgery has been used to treat primary malignant pulmonary tumors at our institute since November 2004. In this study we analyzed our treatment results and complication rates. Material and Method: A retrospective study using medical charts and imaging data was conducted involving 17 patients with a total of 17 malignant pulmonary tumors who were treated between November 2004 and March 2007. Fourteen patients were males and 3 were females. The median age of the patients was 64 years (range, $54{\sim}77$ years). The average size of the tumors was 48.8mm (range, $36{\sim}111mm$) in diameter. The patients were followed with chest CT scans 7 days, 1 month, 3 months, and 6 months postoperatively. PET scans were obtained between 6 and 9 months postoperatively. The treatment response was analyzed according to the Response Evaluation Criteria in Solid Tumors (RECIST) criteria. Result: Six months after treatment, 6 tumors (35.3%) showed a complete response, 4 (23.5%) had a partial response, 3 (17.6%) had stable disease, and 4 (23.5%) showed disease progression. In tumors <4 cm in diameter, a complete response was reported in 50% of the tumors. A $x^2$-test showed that in tumors <4 cm in diameter, the p-value for results better than a partial response was 0.034. With respect to procedural complications, there was 1 case of blood-tinged sputum which resolved spontaneously within 1 or 2 days, a spontaneously relieved case of subcutaneous emphysema, and 1 patient with a fever. There were no mortalities and the average hospital stay was 6.3 days. Conclusion: The effects of cryosurgery on primary lung cancer is greatest in patients with small tumors. Considering the facts that cryosurgery is minimally invasive, has a low complication rate, and can be performed repetitively, we believe that it may play an important role in the treatment of high risk lung cancer patients.

• Journal of Chest Surgery
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• v.42 no.2
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• pp.157-164
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• 2009

Background: Various studies and experimental trials have been done to develop bioprosthetic devices to treat complex congenital heart disease due to the limited usage of homograft tissue. The purpose of the present study was to evaluate the effect of diamine bridges with using L-lysine, as compared with using ethanol. Material and Method: Porcine pericardium was fixed at 0.625% GA (commercial fixation). An interim step of ethanol (80%; 1 day at room temperature) or L-lysine (0.1 M; 2 days at $37^{\circ}C$) was followed by completion of the GA fixation (2 days at $4^{\circ}C$ and 7 days at room temperature). The tensile strength and thickness of the porcine percardium were measured, respectively. The treated pericardiums were implanted subcutaneously into three-week old Long-Evans rats for 8 weeks. The calcium content of the implants was assessed by atomic absorption spectroscopy and the histology. Result: Ethanol pretreatment ($13.6{\pm}10.0ug/mg$, p=0.008), L-lysine pretreatment ($15.3{\pm}1.0 ug/mg$, p=0.002), and both treatment ($16.1{\pm}11.1ug/mg$, p=0.012) significantly inhibited calcification, as compared with the controls $(51.2{\pm}8.5ug/mg)$. L-lysine pretreatment ($0.18{\pm}0.02mm,\;1.20{\pm}0.30kg$ f/5 mm) significantly increased the thickness and tensile strength, as compared with ethanol pretreatment ($0.13{\pm}0.03mm,\;0.85{\pm}0.36$ 1.0 kg f/5 mm) (p<0.01, p=0.035). Conclusion: The diamine bridges using L-lysine seemed to decrease the calcification of porcine pericardium fixed with glutaraldehyde, and this was comparable with Ethanol. Additionally, it seemed to enhance the thickness and tensile strength.

• Journal of Chest Surgery
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• v.40 no.11
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• pp.733-744
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• 2007

Background: There is a controversy regarding the pathogenesis and management principle of an acute intramural hematoma (IMH) of the aorta, Recent studies have reported intimal defects in many patients diagnosed with IMH, and suggested that intimal defects play important roles in the pathogenesis, progression of the pathology, and prognosis. Material and Method: This study reviewed the preoperative and postoperative computed tomography (CT) scan images of 36 patients who underwent surgical treatment for Stanford type A acute IMH of the aorta. The surgical findings were also reviewed retrospectively from the medical records. Result: In 15 patients (41.7%), the findings suggestive of the intimal defects were found in the preoperative CT. During the operation, 20 patients (72.2%) were found to have small intimal defects in the ascending aorta or the arch, of which 13 patients (50.5%) did not have the CT findings suggestive of intimal defects. In 17 patients, the intimal defects were located in the aortic arch or distal ascending aorta, where a gross examination would have been impossible without total circulatory arrest. In all patients, the intimal defects identified were included in the resected aortic segment, or locally closed. Follow-up CT at 4 months or longer after surgery showed that the IMH in the descending aorta had disappeared or was markedly improved. Conclusion: Most patients undergoing surgical treatment for acute type A IMH had intimal defects. This suggests that a large proportion of IMH might have a similar pathogenic mechanism as classic dissection. Consequently, it is believed that those two entities of acute aortic syndrome should be treat-ed using the same principles.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.65 no.2
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• pp.113-123
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• 2020

Global climatic change and increasing climatic instability threaten crop productivity. Due to climatic change, drought stress is occurring more frequently in crop fields. In this study, we investigated the effect of treatment with hydrogen peroxide (H₂O₂) before leaf development on the growth and yield of sorghum for minimizing the damage of crops to drought. To assess the effect of H₂O₂ on the growth of sorghum plant, 10 mM H₂O₂ was used to treat sorghum leaves at the 3-leaf stage during growth in field conditions. Plant height, stem diameter, leaf length, and leaf width were increased by 7.6%, 9.6%, 8.3% and 11.5%, respectively. SPAD value, chlorophyll fluorescence (Fv/Fm), photosynthetic rate, stomatal conductance, and transpiration rate were increased by 3.0%, 4.9%, 26.0%, 23.4% and 12.7%, respectively. The amount of H₂O₂ in the leaf tissue of sorghum plant treated with 10 mM H₂O₂ was 0.7% of the applied amount after 1 hour. The level increased to approximately 1.0% after 6 hours. The highest antioxidant activity measured by the Oxygen Radical Absorbance Capacity assay was 847.3 µmol·g^-1 at 6 hour after treatment. However, in the well-watered condition, the concentration of H₂O₂ in the plant treated by the foliar application of H₂O₂ was 227.8 µmol·g^-1 higher than that of the untreated control. H₂O₂ treatment improved all the yield components and yield-related factors. Panicle length, plant dry weight, panicle weight, seed weight per plant, seed weight per unit area, and thousand seed weight were increased by 8.8%, 18.0%, 24.4%, 24.7%, 29.9% and 7.1%, respectively. Proteomic analysis showed that H₂O₂ treatment in sorghum increased the tolerance to drought stress and maintained growth and yield by ameliorating oxidative stress.

• Economic and Environmental Geology
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• v.39 no.6 s.181
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• pp.699-710
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• 2006

Batch scale experiments to investigate the efficiency of the solidification process for metal mine tailing treatment were performed. Portland and MSG (micro silica pouting) cements were used as solidifier and three kinds of mine tailings (located at Gishi, Daeryang, and Aujeon mine) were mixed with cements to paste solidified matrices. Single axis com-pressible strengths of solidified matrices were measured and their heavy metal extraction ratios were calculated to investigate the solidification efficiency of solidified matrices created in experiments. Solidified matrices ($5cm{\times}5cm{\times}5cm$) were molded from the paste of tailing and cements at various conditions such as different tailing/cement ratio, cement/water ratio, and different cement or tailing types. Compressible strengths of solidified matrices after 7, 14, and 28 day cementation were measured and their strengths ranged from 1 to $2kgf/mm^2$, which were higher than Korean limit of compressible strength for the inside wall of the isolated landfill facility ($0.21kgf/mm^2$). Heavy metal extractions from intact tailings and powdered matrices by using the weak acidic solution were performed. As concentration of extraction solution for the powdered solidified matrix (Portland cement + Gishi tailing at 1:1 w.t. ratio) decreased down to 9.7 mg/L, which was one fifth of As extraction concentration for intact Gishi tailings. Pb extraction concentration of the solidified matrix also decreased to lower than one fourth of intact tailing extraction concentration. Heavy metal extraction batch experiments by using various pH conditions of solution were also performed to investigate the solidification efficiency reducing heavy metal extraction rate from the solidified matrix. With pH 1 and 13 of solution, Zn and Pb concentration of solution were over the groundwater tolerance limit, but at pH $1{\sim}13$ of solution, heavy metal concentrations dramatically decreased and were lower than the groundwater tolerance limit. While the solidified matrix was immerged Into very acidic or basic solution (pH 1 and 13), pH of solution changed to $9{\sim}10$ because of the buffering effect of the matrix. It was suggested that the continuous extraction of heavy metals from the solidified matrix is limited even in the extremely high or low pH of contact water. Results of experiments suggested that the solidification process by using Portland and MSG cements has a great possibility to treat heavy metal contaminated mine tailing.

• Journal of Korean society of Dental Hygiene
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• v.12 no.2
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• pp.317-326
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• 2012

Objectives : This study aims to examine satisfaction of dental treatment and revisit and intention of recommendation to dental patients and to supply as a basic resource for dental management improvement. Methods : 645 dental patients to dental hospitals in G City were subjects of this study. 27 dental hospitals were randomly chosen per 5 or 6 in 5 Districts. The intention of the survey was explained to 645 patients and it was agreed to have questionnaire survey. Questionnaire survey was carried out for 2 weeks in April 2011. Total 593 were used for the analysis except for insufficient answer sheets. The analysis was executed by using SPSS 18.0 and the results are as follows. Results : 1. The highest figures are as follows: female was 53.29% in sex, 20-29 age group was 44.52%, graduates of university were 38.62%, students were 28.50%, monthly family income with 300-399 million won was 31.70%. As to the treatment, dental caries were highest with 46.21% followed by scaling with 40.81%. As to the number of visit, 39.80% were over 5 times, and as to the opportunity to use, 29.34% answered it because it is close to home. 2. As to satisfaction, male was 4.15, over 60years old was 4.58, self-employed was 4.33, friendship with dentist as opportunity to use was 4.37. And as to revisit intention, over 60 years old was 4.60, over postgraduate in education level was 4.38, self-employed was 4.43, over 5 times visit was 4.32, and fame as opportunity to use was 4.39 which were the highest. As to the intention of recommendation to others, female was 4.24, over 60 years old was 4.65, self-employed was 4.36, friendship with dentist as opportunity was 4.43 which were the highest and showed significant differences (p<0.05). 3. As to patient satisfaction, there were strong relevance between revisit intention and intention of recommendation with 0.769 and 0.744 respectively. And, as to revisit intention, it had significant relation with revisit intention with 0.791. 4. The explanatory power of the regression analysis on the factors affecting revisit intention was 61.20%. The revisit intention was high when the satisfaction of dental hospital was high (${\beta}$=0.767, p<0.001), the number of visit (${\beta}$=0.026, p<0.01), reason for a visit (${\beta}$=0.070, p<0.01), education level (${\beta}$=-0.063, p<0.05) and occupation (${\beta}$=0.078, p<0.05). 5. The explanatory power of the regression analysis on the factors affecting intention of recommendation was 59.9%. The intention was taken patients satisfaction(${\beta}$=0.601, p<0.001), dental hygienist's kindness (${\beta}$=0.218, p<0.001), female (${\beta}$=0.079, p<0.05), reason for a visit(${\beta}$=-0.059, p<0.05), dissatisfaction treat(${\beta}$=0.084, p<0.05), dentist's kindness (${\beta}$=-0.080, p<0.05), age (${\beta}$=0.054, p<0.05). Conclusions : To improve revisit rate of patients, the refurbishing hospital facility, treatment and kindness of dental hygienists and satisfaction of treatment must be improved. And it also needs to accept complaint from female patients in a positive manner, and understand and correct complaints actively from the perspective of patients.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.4
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• pp.393-400
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• 2008

1,4-Dioxane($C_4H_8O_2$), which is used as a solvent stabilizer, could make harmful effects on ecosystem because of its higher solubility, toxicity and carcinogenic by US EPA. From 2011, its discharge limit to waterbody will be regulated at 5 mg/L by Ministry of Environment Republic of Korea. It was thus to investigate that the currently operating activated sludge in polyester manufacturing processes in Gumi can properly treat it to meet with the regulation standard. For that purpose, the removal rate of 1,4-dioxane and its microbial properties were assessed for a few companies(i.e. K, H and T). Its removal efficiency was the most highly recorded in H as 98% and then 77% for K, which met with the regulation standard. However, concentration of 1,4-dioxane of T was 23 mg/L in the effluent, which is more than the regulation standard. Aside from, microbial degradation test was done for 100 ppm of 1,4-dioxane in BSM (Basal salt medium) inoculated with each of activated sludge. After 7 days, 1,4-dioxane was completely removed in the test bottle inoculated with H sludge, 67% in T and 52% in K, which could confirm that the given activated sludge might have different biodegradability against the amount of 1,4-dioxane. Therefore, microbial diversity in each company was investigated by 16s rDNA cloning methods where a species, e.g. Methylibium petroleiphilum PM1, was the greatest observed from H and in lesser from K, but it was not detected from T. Methylibium petroleiphilum PM1 is known to efficiently degrade ether like methyl tertiary-butyl ether(MTBE). It is concluded that the activated sludge in H can be most effectively adopted for a biodegradation of 1,4-dioxane in the concern of industrial sector.

• Korean Journal of Psychosomatic Medicine
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• v.12 no.1
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• pp.76-85
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• 2004

Objectives: The purpose of the present study was to investigate the emotional state and personality characteristics of patient with panic disorder. Methods: Twenty patients with panic disorder, 21 patients with somatoform disorder, and 20 normal healthy controls were studied. Korean version of Beck Depression Inventory(BDI), State and Trait Anxiety Inventory(STAI) and Korean standardized edition of Cattell's 16 Personality Factors Questionnaire(16-PF) were used for assessment. Statistically, One-way ANOVA with Scheffe test were used by SPSS/PC for windows. Results: 1) Total score of BDI was higher in the panic group than the somatoform group and normal control group(p<0.001). 2) Total score of state anxiety and trait anxiety in the panic group was higher than the somatoform group and normal control group(p<0.001). 3) In 16 PF, there were no definitely abnormal range of scores. But in first-stratum source traits of 16PF, the panic group was higher than the somatoform group and normal healthy group in O-factor (p<0.01) and Q4-factor(p<0.001). In second-stratum source traits of 16PF, the panic group was higher than the somatoform group in ANX-factor(p<0.05), but lower than normal control group in TOUfactor(p<0.05). 4) There were no differences in the panic subgroup according to sex and cutoff points of BDI score 16 and STAI-T score 54. 5) According to cutoff point of STAI-S score 52, the panic subgroup above 52 was higher than the panic subgroup under 52 in G-factor(p<0.001), Q3-factor(p<0.05) and SUP-factor(p<0.001), but lower in L-factor(p<0.05). Conclusion: These results suggest that emotional state of patients with panic disorder are depressive and anxious as compared with patients with somatoform disorder and normal controls. Patients with panic disorder did not show any abnormal personality characteristics but were more guilt-prone, anxious, emotionally sensitive. We propose that the understanding of panic patients' emotional state and personality characteristics will helpful to treat and manage in patient with panic disorder.