Jin, Young Man;Chung, David Chanwook;Chang, Young Pyo;Lee, Yung Suk;Lee, En Sun
Clinical and Experimental Pediatrics
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v.50
no.3
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pp.255-261
/
2007
Purpose : The objective of this study is to observe high-resolution computed tomography (HRCT) findings of lung parenchyme in very low birth weight (VLBW) infants between the corrected age of 38-42 weeks who were treated with oxygen after birth, and to compare them to the clinical severity of bronchopulmonary dysplasia (BPD). Methods : The lungs of fourty-four VLBW infants with gestational ages of less than 32 weeks and birth weights of less than 1,500 g who were treated with oxygen after birth were examined using HRCT taken when the corrected age was between 38-42 weeks. Common findings among the infants and the frequency of their occurrences were noted. Total CT scores obtained by the summation of air trapping and actelectasis scores and the ratio of bronchus-to-pulmonary artery diameter were used to quantitatively evaluate HRCT findings and correlate them with the clinical severity of BPD as defined by Jobe-Bancalari diagnostic criteria. Results : 1) The most common findings in HRCT images of the lungs were air trapping (56%), atelectasis (70.5%), linear opacity (77%), and distortion of the bronchopulmonary bundle (65.9%). These findings were more commonly observed in infants with BPD in a mixed pattern than those without (P<0.05). However, abnormal findings were also found in HRCT images of some infants without BPD. In infants with BPD, air trapping, atelectasis and total CT scores were higher than those without BPD. Also infants with BPD had a lower bronchus-to-pulmonary artery diameter than those without BPD (P<0.05). 2) The total CT scores (r=0.799, P<0.0001) and the ratio of bronchus-to-pulmonary artery diameter (r=0.576, P<0.0001) showed a linear correlation with the clinical severity of BPD. Conclusion : HRCT findings in VLBW infants between the corrected age of 38-42 weeks who had been treated with oxygen after birth are useful in revealing pathologic changes in the lung parenchyme and show a good correlation with the clinical severity of BPD.
This study evaluated the effect of the nutrition education about infant feeding on the change of mother's knowledge, attitude and practice of weaning. The subjects consisted of treatment group (n=54) and control group (n=34). The treatment group participated in 6 times nutrition education and 5 times surveys. Nutrition education for weaning of the treatment group improved nutrition knowledge, attitude and practice in infant feeding. Before education, mean scores of control group and treatment group were 7.3 and 7.5 respectively but there was no significant difference. Both group got low score in a statement about weaning period, but they got good score in a statement about weaning method. After education, treatment group got better score(9.1) than control group(8.3) significantly (p<0.05). Treatment group was more desirable than control group specially in a use of Sun-sik, sugar, salt and weaning food mixed with formula after education (p<0.05). Practice of spoon feeding was more frequent in treatment group after education, however, control group used sugar and commercial weaning food more frequently than treatment group(p<0.05). Intake frequency of cow's milk and cookies of infants at age 9-12 month in control group was higher than treatment groups(p<0.01). Thus the nutrition education to mother seems to be effective in achieving desirable dietary behavior of infants.
Proceedings of the Korean Institute of Navigation and Port Research Conference
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2004.04a
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pp.5-9
/
2004
In this paper, we studied the OCT(Optical Coherence Tomography) system which it has been extensively studied because of having some advantages such as high resolution cross-sectional images, low cost, and small size configuration. A basic principle of OCT system is Michelson interferometer. The characteristics of light source determine the resolution and the transmission depth. As a results, the light source have a commercial SLD with a central wavelength of 1,285 nm and FWHM(Full Width at Half Maximum) of 35.3 nm. The optical delay line part is necessary to equal of the optical path length with scattered light or reflected light from sample. In order to equal the optical path length, the stage which is attached to reference mirror is moved linearly by step motor And the interferometer is configured with the Michelson interferometer using single mod fiber, the scanner can be focused of the sample by using the reference arm. Also, the 2-dimensional cross-sectional images were measured with scanning the transverse direction of the sample by using step motor. After detecting the internal signal of lateral direction at a paint of sample, scanner is moved to obtain the cross-sectional image of 2-demensional by using step motor. Photodiode has been used which has high detection sensitivity, excellent noise characteristic, and dynamic range from 800 nm to 1,700 nm. It is detected mixed small signal between noise and interference signal with high frequency After filtering and amplifying this signal, only envelope curve of interference signal is detected. And then, cross-sectional image is shown through converting this signal into digitalized signal using A/D converter. The resolution of the OCT system is about 30$\mu\textrm{m}$ which corresponds to the theoretical resolution. Also, the cross-sectional image of ping-pong ball is measured. The OCT system is configured with Michelson interferometer which has a low contrast because of reducing the power of feedback interference light. Such a problem is overcomed by using the improved inteferometer. Also, in order to obtain the cross-sectional image within a short time, it is necessary to reduce the measurement time for improving the optical delay line.
Park, Seung-Youn;Nam, Dong-Woo;Kim, Young-Jin;Kim, Hyun-Jung;Nam, Soon-Hyeun
Journal of the korean academy of Pediatric Dentistry
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v.31
no.2
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pp.169-179
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2004
The purpose of this study was to discriminate clinically and radiographically among the three groups of dentigerous cysts studied. First, Group I, involved area of dentigerous cyst was successive permanent tooth area beneath deciduous tooth. Second, Group II, involved permanent molar area, and the last, Group III involved maxillary anterior supernumerary tooth area. The author observed and compared the clinico-radiographic features of 49 cases of Group I, 36 cases of Group II, and 15 cases of Group III of dentigerous cyst and this observation and comparison had been done by based on the charts and panoramic films. The obtained results were as follows: 1. The cases of Group I were 29 cases and, those of Group II were 36 and those of Group III were 15. 2. The incidence of dentigerous cyst is high in first decade. In Group I, before first decade and early first decade was 87.8%, in Group II and Group III, was discovered more lately. 3. The frequency of dentigerous cyst is 2.5 times higher in male than in female. 4. The sequence of chief complaint was swelling(50%), routine examination(32%), and pain(9%). 5. When considering the type of the cyst, lateral type is many most in Group I (71.4%) and central type is many most in Group II (94.4%) and Group III (100%). 6. The most size of dentigerous cyst was 2 crown size in Group I, 1 crown size in Group II, above of 4 crown size in Group III. 7. Almost involved teeth showed displacement and some tooth of displaced teeth showed delayed root development and dilaceration of root. 8. The most many response of alveolar bone was buccal bone expansion in Group I (67.3%), no bone expansion in Group II(66.7%) and palatal bone expansion in Group III (60.0%). 9. The percentage of involved teeth were as follows : The mandibular third molar was 31% and many most. The mandibular second premolar was 30%. Mesiodens of maxillary anterior area was 15%. The maxillary canine was 8%. The mandibular first premolar was 5%. 10. In the Group I, causes suggesting of dentigeous cyst are pulpotomized deciduous tooth(59.2%), severe dental caries of deciduous tooth, untreated traumatic history on the deciduous tooth etc. 11. The treatment method of dentigerous was marsupialization in 61.2% of cases of Group I and that was enucleation in 61.1% of cases of Group II and in 80.0% of cases of Group III.
The Journal of Korean Institute of Electromagnetic Engineering and Science
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v.18
no.3
s.118
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pp.248-256
/
2007
In this paper, we propose a selective DFT spreading method to solve a high PAPR problem in uplink OFDMA system. A selective characteristic is added to the DFT spreading, so the DFT spreading method is mixed with SLM method. However, to minimize increment of computational complexity, differently with common SLM method, our proposed method uses only one DFT spreading block. After DFT, several copy branches are generated by multiplying with each different matrix. This matrix is obtained by linear transforming the each phase rotation in front of DFT block. And it has very lower computational complexity than one DFT process. For simulation, we suppose that the 512 point IFFT is used, the number of effective sub-carrier is 300, the number of allowed sub-carrier to each user's is 1/4 and 1/3 and QPSK modulation is used. From the simulation result, when the number of copy branch is 4, our proposed method has more than about 5.2 dB PAPR reduction effect. It is about 1.8 dB better than common DFT spreading method and 0.95 dB better than common SLM which uses 32 copy branches. And also, when the number of copy branch is 2, it is better than SLM using 32 copy branches. From the comparison, the proposed method has 91.79 % lower complexity than SLM using 32 copy branches in similar PAPR reduction performance. So, we can find a very good performance of our proposed method. Also, we can expect the similar performance when all number of sub-carrier is allocated to one user like the OFDM.
This retrospective study was performed to describe and evaluate ultrasonographic characteristics of splenic disorders and to pursue any relationship with cytologic or histopathologic diagnoses. Medical records were reviewed for patients that had undergone both abdominal ultrasonographic procedures and ultrasound-guided fine-needle aspiration (FNA) or surgical biopsy of splenic lesions or necropsy from January 2002 to July 2011 at Seoul National University Hospital for Animals. Total 124 dogs, 76 cases with FNA and 48 cases with biopsy, were available for this investigation. The age of dogs ranged from 2 to 17 years ($mean{\pm}SD$ = $9.54{\pm}3.34$ years), with the gender distribution of 61 females (26 spayed) and 63 males (40 neutered). In breed distribution, 114 were purebred dogs and 10 were mixed breed dogs. The dogs represented 26 breeds, with 113 dogs categorized into small-sized breeds. The ultrasonographic appearances of splenic disorders could be classified into 10 types including normal appearance, depending on the distribution and echogenicity of splenic lesions as well as the increase in spleen size and diffuse parenchymal changes. Among 124 cases, 44 (35.4%) had hypoechoic nodules/masses with the highest frequency, followed by 23 (18.5%) with multiple small hypoechoic nodules. Of 124 cases, 70 (56.5%) were benign and 54 (43.5%) were malignant lesions at cytologic or histopathologic results. Each ultrasonographic appearance had variable cytologic or histopathologic diagnoses. However, diffuse heterogenicity and diffuse hypoechogenicity were significantly associated with malignancy (p < 0.05), whereas hyperechoic nodules/masses were more often associated with benignity (p < 0.05). Based on our results, it may be considered that the ultrasonographic examination for spleen could be able to provide the least information necessary for benign and malignant lesions in prioritizing differential diagnoses.
To improve Bacillus strains producing biopolymer, conditions for protoplast formation and regeneration were investigated in biopolymer producing Bacillus subtilis K-1 and lactose utilizing Bacillus coagulans. Bacillus subtilis K-1 mutant (SM-2) and Bacillus coagulans mutants (CM-12) were marked auxotrophic and antibiotics-resistant (SM-2) and an antibiotics-resistant mutants, respectively. To formate protoplasts derived from the mutants, conditions were established as follows. For B. subtilis mutant SM-2, its culture in mid-logarithmic phase was added with penicillin G (1.0 unit/ml) and further reacted for 1.5 hr. Cells were collected and then treated in lysis fluid (pH 7.0) containing 0.4 M sucrose and lysozyme $25\;{\mu}g/ml$ for 40 min at $37^{\circ}$. Protoplast formation was very successful (99.6%) and the ratio of cell wall regeneration was 2.4%. For Bacillus coagulans mutant CM-12, its mid-logarithmic phase culture was treated with penicillin G (0.3 unit/ml) and glycine (0.5%) for 1hr. Cells were collected and then resuspended in lysis buffer (pH 7.0) containing 0.6 M lactose and lysozyme $(300\;{\mu}g/ml)$ for 30 min at $37^{\circ}$. Protoplast formation was also successful (90.8%) and cell wall regeneration ratio was similar to SM-2 (2.2%). To improve regeneration frequency, regeneration medium was obtained as followed condition,. Cell wall regeneration was improved 2-4 folds with 5.1% for B. subtilis SM-2 and 10.3% for B. coagulans CM-12 when protoplasts mixed with soft top agar(0.4%) was overlaid onto trypticase soy broth medium containing 0.4 M sucrose, 0.7% casamino acid, 1% PVP, 25 mM $MgCl_2,\;25\;mM\;CaCl_₂$ and 1.5% agar.
For the purpose of examining the effects of simulated acid rain on nutrient contents of plant tissues in Pintos densiflora seedlings and Forsythia koreana rooted cuttings, the experimental design of randomized block arrangement with three replications was implemented in the experimental field of Yesan National Agricultural Junior College. One-year-old Pinus densiflora seedlings and Forsythia koreana cuttings were planted in the pots filled the mixed soils(nursery soil : forest soil of siliceous sandy loam=1 : 1 v/v) in the early spring of 1986. The regime of artificial acid rain, in terms of spray frequency per month and spray amount at single treatment per plot, was simulated on the basis of climatological data averaged from 30 years records. Simulated acid rain(pH 2.0, pH 4.0, and pH 5.5 as control) containing sulfuric and nutric acid in the ratio of 3 : 2(chemical equivalant basis) diluted with ground water were treated on the experimental plants under condition of cutting off the natural precipitation with vinyl tunnel, during the growing season(May 1 to August 31) in 1986. The results obtained in this study were as follow : (1) As for the nitrogen contents in plant tissues, P. densiflora increased significantly in one-year-old stembranch and root tissues, and F. koreana increased significantly in leaf and root tissues, as the pH levels of acid rain decreased. (2) The available phosphate contents in root tissues of P. densiflora, and in leaf and root tissues of F. koreana were significantly decreased, as the pH levels of acid rain decreased. (3) $K_2O$, CaO and MgO contents in plant tissues were significantly decreased in the both species as the pH levels decreased. And the effects of acid rain on F. koreana were higher than those of P. densiflora. (4) Sulfur contents of plant tissues in the both species were increased at pH 2.0 treatment. There were significant differences among three acid rain treatments in leaf and root tissues of P. densiflora, and in all parts of F. koreana. (5) In the effects of simulated acid rain on the both species and the tested soils, in general, F. koreana revealed higher sensitiveness than P. densiflora, and the lower pH levels of simulated acid rain were treated, the more sharp reaction was showed.
Journal of Korean Home Economics Education Association
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v.19
no.4
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pp.1-15
/
2007
This study was conducted to analyze recognition, applicability, class satisfaction, and needs as well as students' attitudes for eating behavior by 1st and 3rd graders of a mixed middle school located in Gyeonggi area in relation to food and nutrition section of the Technology and Home Economics curriculum and thereby provide basic data for development of strategies of educational effect maximization of food and nutrition in the curriculum. 522 questionnaire were collected and statistically processed. Findings from this study are as follows. Both 1st and 3rd graders were found to exhibit relatively low preference for technology and home economics curriculum. While 1st graders were more interested in the subject than 3rd graders, the frequency of practical use of the food and nutrition section in every day life was higher in 3rd graders than that in 1st graders. For food and nutrition section of the subject, preference level of the 1st graders was higher than 3rd graders. The 1st graders were higher than 3rd graders in the needs for food and nutrition section as well as in usefulness in every day life of the unit. The applicability in every day life of the unit was found to be generally higher, with 1st graders having a higher level of applicability than 3rd graders (p<0.001). Class satisfaction of the unit was higher in 1st graders than 3rd graders, with the most satisfactory unit being 'basics and practice of cooking' both for 1st and 3rd graders. Needs for food and nutrition unit were higher in 1st graders than 3rd graders, with the unit highly needed being 'basics and practice of cooking' both for 1st and 3rd graders. Regarding interrelation of the degree of preference, need, applicability and class satisfaction, as the preference was high on food and nutrition, the degree of need, applicability, and class satisfaction was high. As respondents recognized food nutrition section necessary, they were more satisfied and showed high applicability for the section. Therefore, contents of food and nutrition section should be improved with re-organization of educational and subject contents so that they will be best fit for students by grade, to increase preference, applicability and necessity in every life. In addition, to maximize the applicability of the subject in everyday life, sufficient class-time should be assigned for the purpose of experiment- and practice-based education, and a wide range of teaching strategies are needed to increase students' interest in the subject.
Journal of agricultural medicine and community health
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v.31
no.3
/
pp.275-284
/
2006
Objectives: This investigation was carried out to understand the status of the urinary incontinence (UI) and overactive bladder (OABs) syndrome of women in a rural region. Methods: The authors conducted a questionnaire survey among the 322 females who voluntarily participated in a health examination, from 16 to 18 August 2001. Using by definition of UI and OABs, we calculated the proportion of UI, OABs I, and OABs II. The data collected was evaluated using the SPSS 12.0 statistical package, and the differences of symptoms and problems related to daily life between UI, OABs patients and the others were analyzed using a Chi-square test or Fisher's exact test. Results: The overall proportion of UI was 35.4%, and stress UI (32.9%) is more common than urgency UI (17.4%) and mixed UI (14.9%). The proportion of OABs I and OABs II were respectively 36.0%, 14.0%. Symptoms related to UI or OABs were nocturia (35.1%), frequency (23.9%), urgency (21.4%) etc. Of the incontinence cases, 27.2% had experienced UI for a period of one to three years. The proportion of OABs increased significantly by age (p<0.05), UI didn't. The most frequent symptoms in UI and OABs were respectively 'slow stream', 'urgency'. The most frequent problem of daily life in UI and OABs was 'seeking toilet firstly at stranger place'. Conclusions: The proportion of UI and OABs in our study were respectively 35.4%, 14.0%. UI and OABs must be very significant health problems in women, especially rural region. Systemic and profound interventions for UI and OABs need to administer to women in Korea.
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