Kim, Seong-Jin;Kim, Moon-Gwan;Park, So-Min;Ban, Jae-Sam;Park, Sang-Won
The Journal of Korean Academy of Prosthodontics
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v.50
no.4
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pp.249-257
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2012
Purpose: This study was designed to help to provide the criteria of the esthetic smile in oromaxillary region on twenties, fifties and sixties. Materials and methods: The facial straight photographs of 33 adults (male 15, female 18, mean age 27.2 years old) and 20 seniors (male 7, female 13, mean age 55.6 years old) in resting and smile position were taken. The measurements and proportion of lip-teeth relation during smile were statistically analyzed, and survey of freshmen and seniors who belong to School of Dentistry, Chonnam National University were taken to select the best esthetic smile among the photographs. Results: In the relationship between the upper lip and the teeth, average smile was the most frequent, and mean of smile line ratio was 1.090 in young group and 0.90 in old group. The correlation between the buccal corridor ratio and exposed teeth count was inversed. At smile, most frequently exposed tooth was the second premolar (63.64%) in young gourp and the first premolar (35.00%) in old group. The correlation between the upper lip change ratio and exposed clinical crown length of maxillary central incisor was inverse, but there was no correlation between the lower lip change ratio and exposed clinical crown length of maxillarycentral incisor. Conclusion: In the result of survey, the students selected the case exposed to the first premolar as the most esthetic smile. The most esthetic smile between full facial photograph and the lip only photograph by the freshmen was different, but that by seniors was identical.
Kim, Choonsig;Lim, Jong Hwan;Lee, Im Kyun;Park, Byung Bae;Chun, Jung Hwa
Journal of Korean Society of Forest Science
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v.102
no.2
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pp.210-215
/
2013
Litterfall production represents a major contribution of carbon and nutrient cycling in forest ecosystems. This study was carried out to determine the litterfall production in a broadleaved deciduous forest at the Mt. Keumsan Long Term Ecological Research (LTER) site, Southern Korea. Littefall was collected monthly or bimonthly from the site for 7 years from 2004 to2010. Leaf and reproductive (catkins) litters showed a seasonal variation, but litters of needle, branch, and barks were not changed across the seasons. Annual leaf litter of Quercus serrata and Carpinus laxiflora were significantly different (p<0.05) but that of C. cordata, Chamaecyparis obtusa, and Pinus thunbergii was not significantly changed for 7 years (p>0.05). Annual average litterfall production was 5,223 kg/ha, but annual variations were very large with minimum of 4,110 kg/ha/yr in 2004 and maximum of 6,002 kg/ha/yr in 2007. Total litterfall comprised of 2,323 kg/ha/yr in Q. serrata, 442 kg/ha/yr in C. laxiflora, 157 kg/ha/yr in C. cordata, 131 kg/ha/yr in Acer pseudosieboldianum, 390 kg/ha/yr in other deciduous tree species, 74 kg/ha/yr in P. thunbergii, 37 kg/ha/yr in C. obtusa, 672 kg/ha/yr in branches, 515 kg/ha/yr in miscellaneous, 448 kg/ha/yr in reproductive parts, and 54 kg/ha/yr in barks. respectively. The results indicate that litterfall production of the Mt. Keumsan LTER site was yearly fructurated with the positive linear relationship between leaf or total litterfall and annual mean temperature if no disturbance such as a typoon, and was lower than that of other Korean LTER sites.
Journal of the korean academy of Pediatric Dentistry
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v.33
no.2
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pp.233-243
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2006
The aim of this study was to investigate the relationship between the C-factor and shrinkage strain values of composite resin and examine the strain values in different incremental filling techniques. Experiment consisted two aims. First, we compared with strain value in two different C-factors(3.7 and 1.0). Second, we examined the strain values in three different filling techniques. The results of the present study can be summarized as follows : 1. High C-factor groups showed higher contraction stress values than low C-factor groups at 900 sec after polymerization. 2. Hybrid resin showed higher contraction stress values than flowable resin in high C-factor cavities. But contraction stress was not revealed significant difference between hybrid resin and flowable resin in low C-factor cavities (P>0.05). 3. Bulk felling with hybrid resin(Group 1) showed high contraction stress and lining with flowable resin followed hybrid resin (Group 5) showed lower contraction stress. 4. Contraction stress were increased during 900 sec after polymerization in high C-factor groups but decreased gradually after 900 sec. 5. Low C-factor groups showed tight marginal seal between resin and cavity wall but high C-factor groups showed gaps formed between resin and cavity wall in part. On the basis above results, layering techniques in high C-factor cavity showed advantages in reducing contraction stress and gap formation between cavity wall and resin restoration.
Kim, Mi-Sook;Yi, Chun-Ja;Ha, Sung-Whan;Song, Myung-Jae;Kim, Hee-Jeun
Journal of Radiation Protection and Research
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v.19
no.1
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pp.51-68
/
1994
It is good method to use frequency of chromosome aberration in Lymphocytes for a biological dosimetry in cases of accidental exposure to radiation. But in cases of past exposure, biological dosimetry is limited because the frequency of aberration decreases by time after exposure. To provide a basic data for estimation of past radiation exposure, the changing pattern of frequency of unstable chromosome aberration by time interval after exposure was studied. Observation was made on peripheral lymphocytes of 41 blood samples from 20 patients treated for uterine cervical carcinoma and endometrial carcinoma. The patients received 50.4Gy radiation to whole pelvis. Elapsed times after the completion of radiation therapy were 1 day, 3, 6, 9, 12, 24, 52, 104, 156, 208, 260 and 520 weeks. All the blood sample were microcultured. The Ydr, Qdr and Qdra were calculated from frequency of unstable aberration. Ydr did not decrease for 3 weeks after radiation therapy, and thereafter, decreased very rapidly and reached 0.05 at two years after radiation therapy and decreased very slowly until 5 years after radiation therapy. Relationship between unstable chromosome aberration and time interval after radiation therapy was described as $Ydr=0.259{\times}exp(-0.0429T)+0.0560{\times}exp(-0.00106T)$ (time in weeks) Qdr remained constant at 1.51 until 24 weeks after radiation therapy and then decreased to 1.17 at 52 weeks. Therafter, it did not change. Qdra remained constant at 1.10 for 12 weeks after radiation therapy and decreased to 0.81 at 52 weeks. Thereafter, it remained constant. Two superimposed exponential Ydr disappearance rate suggests that it is possible to calculate the past exposure dose. When the elapsed time after exposure is short, Qdr and Qdra are useful papameters for biological dosimetry for past radiation exposure.
Objectives: Obstructive sleep apnea syndrome (OSA) is a moderately prevalent disorder. Even though much progress has been made in the diagnosis of this disorder, the cost-effectiveness of nocturnal polysomnography is undertermined and physicians and patients are still hesitant to undergo this procedure. The authors wanted to see the validity of chin press/tongue curl maneuver in estimating the severity of OSA which is easy to measure and was originally proposed by Simmons etc. by looking at the correlations between this score and the conventional respiratory disturbance indices. Methods: Forty-three sleep-related breathing disorder patients (28 OSA patients and 15 upper airway resistance syndrome (UARS) patients) who underwent investigation for posssible OSA were studied. Two conventional indices of OSA (apnea/hypopnea index (AHI) and oxygen saturation dip rate (SaO2 dips)), four other sleep variables (lowest SaO2, % of time with SaO2<90% (%SaO2 <90), % of sleep stage 1, mean length of SaO2 dips) and the score of Epworth sleepiness scale (ESS) were compared with the chin press score (CPS) which was newly revised by the author and ranges from 0 to 6. Results: The age of subjects was $45.95{\pm}12.47$ (range 14-76) and their average BMI was $25.98{\pm}3.61$ (range 19.65-37.64). There were no significant differences in age, sex and BMI except repiratory disturbance indices and ESS (p<0.05) between OSA and UARS group. Grouped median CPS of the all subjects was 4.14 (range 1-6). There was a remarkable relationship between CPS and diagnosis category (Likelihood Ratio $X^2$ test; $X^2$=17.41, df=5, p=0.004) and measures of association (Somers' $d=0.65{\pm}0.12$, t=4.83, p=0.000) indicated that CPS increased when the diagnosis changed from UARS to OSA. Spearman's rank correlations between CPS and SaO2 dips (R=0.83), between CPS and AHI (R=0.77) were good (p<0.001). Other variables except mean length of SaO2 dips showed good correlations with CPS as well (p<0.05). Regression analysis indicated that when CPS is 3 there is a provability of 0.35 to have AHI of less than 5. Conclusion: Chin press scores that can be measured easily is well correlation with the conventional sleep apnea indices. They may therefore provide a useful guide in diagnosing obstructive sleep apnea synrome.
The development of the aviation technology is beyond the people's imagination. For example, with some exaggeration, If the autopilot engage upon take off, You will realize that you are on the centerline of the foggy JFK runway 13R after 15 hours with only once or twice of intervention. But the more aviation technology develops, the more responsible the pilot will be who has the final authority of the aviation safety. In the JAL 706 accident caused by unidentified reason, the pilot increased pitch abruptly and overrode the control from the autopilot. The result of this process made the death of a flight attendant and some injuries of a few passengers. The district court found the pilot not guilty at the first trial on the ground that the control override was not connected to the possibility of foresight and avoidance of the human death. The pilot was proved to be innocent through the analysis of the DFDR and ADAS that the override did not precede the unidentified pitch up motion. The judicial precedent related to aviation accidents in Korea requires pilots' absolute and extended care compared to the ordinarily prudent or reasonably careful behaviors in the vehicle and medical accidents. Although there is some controversy about the standard care, the care required in the actual operation of high tech aircraft by a pilot should include objective and standard care and be judged by analysis of the scientific data. Although the pilot maintained the unusual hi speed that doesn't have safety margin and descended under turbulence in case of the JAL 706 accident, the court negatived its relation to the cause of pitch up. Also, the override of the control after initial pitch up might have caused the possibility of the death and injury, but the court denied it. Because of this complex cause of the aviation accidents, it is important for a court to figure out the core reason of the event and casual relationship with the pilot Now, It is required that the judgement of negligence in the aviation accidents should include an objective care with scientific data from simulated circumstances(or a simulator) as the Japanese court not from the theory of vehicle's negligence.
Jang, See Jin;Lee, Sook Young;Kim, Suk Chan;Lee, So Young;Cho, Hyun Sun;Park, Ki Hoon;Moon, Hwa Sik;Song, Jeong Sup;Park, Sung Hak;Kim, Young Kyoon;Park, Hyun Jin
Tuberculosis and Respiratory Diseases
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v.63
no.2
/
pp.139-144
/
2007
Background: Bronchial anthracofibrosis, which is defined as bronchial narrowing with black pigmentation of the overlying bronchial mucosa, is frequently associated with tuberculosis. The aim of this study was to examine the relationship between bronchial anthrocofibrosis and to identify the clinical and radiological characteristics of non-tuberculous bronchial anthracofibrosis. Methods: All patients who showed bronchial anthracofibrosis in more than one segment on a bronchoscopic examination from January 2003 to July 2006 at Kangnam St. Mary's hospital were enrolled in this study. The underlying diseases, baseline clinical characteristics, characteristic findings on a computed tomogram (CT) of the chest, pathologic findings of the bronchial mucosa, and the clinical response to steroid therapy were analyzed retrospectively. Results: A total 54 patients (19 males, 35 females) were enrolled with a mean age of 75 years. The most common presenting symptoms were cough, sputum and dyspnea. The predominant X-ray findings were peribronchial soft tissue attenuation with or without calcification, mediastinal lymphadenopathy with or without calcification and atelectasis. Fourteen non-tuberculous anthracofibrosis patients were treated with steroid. Nine patients were improved clinically, and 6 patients were improved radiologically. Conclusion: Bronchial anthracofibrosis is frequently associated with various pulmonary diseases not only tuberculosis but also COPD pneumonia etc.
Journal of the Korean Society of Food Science and Nutrition
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v.35
no.10
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pp.1371-1377
/
2006
Gene polymorphisms that are associated with sodium homeostasis in the body, such as $\alpha-adducin$ (ADDI, Gly460Trp), angiotensinogen (AGT, Met235Thr), and angiotensin converting enzyme (ACE, Ins/Del) may increase the risk for the development of hypertension. The purpose of this study was to elucidate the relationship between the singular and combined effects of ADD1, AGT, ACE genotypes, and blood pressure in elderly population. Moreover, we examined the interaction of sodium intake and polymorphisms of aforementioned genes and their effects on blood pressure. Among one hundred and nine female subjects, aged 60 and over (mean 75.9 yr), the major alleles for ADD1, AGT, and ACE polymorphisms in the studied population were Gly (66.1%), Thr (64.2%), Ins (83.5%), respectively. Analysis on the combined effects of genetic variation showed that subjects who were both ADD1 Trp/Trp and ACE Del/Del homozygotes had significantly higher systolic blood pressure (p=0.01). Similarly, ACE Del/Del homozygotes who had AGT Met allele had significantly higher diastolic blood pressure (p<0.001). However, in single-gene analyses, no association was found between any specific genotype and blood pressure. In subjects with low sodium intake, ADD1 Trp/Trp homozygotes had significantly higher systolic blood pressure than subjects who had ADD1 Gly allele (138 mmHg vs. 127 mmHg, p=0.03). There was no difference in blood pressure between ADD1 Trp/Trp and ADD1 Gly/Gly or Gly/Trp, in subjects with high sodium intake. In summary, this study shows that interactions between the ADD1, AGT and ACE genes influence systolic and diastolic blood pressure in elderly subjects, and dietary sodium intake can modulate the effects of ADD1 Gly460Trp polymorphisms on systolic blood pres sure.
This study was carried out for the purpose of supplying the basic data for artificial forestation, natural regeneration and ecological conservation etc., and obtaining information on alpine vegetation, by establishing vegetation units on the basis of phytosociological classification of community and studying growth pattern on the basis of species composition, hierarchy structure and population dynamics, for Taxes cuspidata naturally growing at the alpine districts in Korea. The importance value of Taxus cuspidata by districts mostly showed above 100 in the upper story but at Mt. Chiri and Mt. Hanra communities its value was comparatively low. In the middle story it showed lower value than that of upper story and not quite showed at Mt. Chiri. Taxus cuspidata communities in the lower story were only in Mt. Hanra, Mt. Odae and Mt. Sobaek, and their importance values were about 10 which were relatively low values. The communities were classified into five groups as Taxus cuspidata-Males baccata var. mandshurica, Taxus cuspidata-Abies nephrolepis, Taxus cuspidata-Abies koreana, Taxus cuspidata-Acer mono and Taxus cuspidata-Euonymus quelpaertensis by TWINSPAN analysis. Taxus cuspidata-Abies koreana community was distributed at the northern aspect of the mountain ridges and at higher elevation than other communities and distributed. Taxus cuspidata-Acer mono community was relatively low than the others and distributed at the hillsides of mountain. And Taxus cuspidata-Euonymus quelpaertensis communities were distributed at the relatively high elevation and northern and eastern aspect of the mountain tap, and Taxus cuspidata-Malus baccata var. mandshurica communities were distributed at the medium elevation, and southern and eastern aspect of the mountain ridge. In the relation between communities and environmental factors, it was correlated with aspect, elevation and topography at the first axis, and elevation, slope at the second axis.
Chang, Jisoon;Kim, Nam Young;Lee, Suk Hee;Kim, Bongseog
Journal of Korean Society of Forest Science
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v.104
no.1
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pp.127-132
/
2015
Aim of this study was to investigate the influence of forest experience program on depression, anxiety, and self concept in adolescents living in urban area. A total of 47 adolescents living in Seoul, South Korea were recruited for the study and participated in a series of forest experience programs that the Korea National Park Service had developed. Before and after applying the program, their depression, anxiety, and self concept were evaluated using Children's Depression Inventory (CDI), Revised Child Manifest Anxiety Scale (RCMAS), and Offer Self Image Questionnaire-Revised (OSIQ). The outcome measures were analyzed using paired-t tests. CDI score was significantly reduced after the program (before:$12.41{\pm}8.34$, after:$8.65{\pm}9.48$). Excluding 16 participants whose scores of Lie Scale in the RCMAS were more than 8 on the analysis, the total RCMAS score showed significant reduction after the program (before:$14.87{\pm}7.30$, after:$10.81{\pm}7.81$). There was no significant difference in the total score of the total self-image scale in the OSIQ. However, the Self-confidence (SC) which was used as subscale of the OSIQ was significantly higher after the program (before:$29.94{\pm}3.71$, after:$38.11{\pm}6.45$), and the Idealism scale (I) in the OSIQ increased significantly after the program (before:$21.03{\pm}3.80$, after:$23.17{\pm}3.89$). On our analysis, the forest experience program showed considerable positive effects on depression and anxiety in adolescents. This result leads the postulation that the program might be helpful for adolescents to adapt to their surrounding experiences and to achieve improvement in interpersonal relationship.
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