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Hyung‑Ki Park,Min‑Soo Han,Chang‑Hwan Chang,Jong‑Tae Park,박창수,Hyung‑Don Joo 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on thecrystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coatedwith a Mg-phosphate was improved, while that coated with an Al-phosphate was deteriorated. The domain wall spacing ofthe samples coated with Mg- and Al-phosphates was respectively increased and decreased after stress relief annealing. Thismeans that the stress relief annealing did not much diminish the tensile stress for Mg-phosphate coating but much diminishedthe tensile stress for Al-phosphate coating. Based on FTIR and XRD results, we found that the crystallization temperatureof silica with Al-phosphate was lower than that of silica with Mg-phosphate. The crystallization of silica was accompaniedby an abrupt volume change, which formed cracks in the tension coating and deteriorated the tensile stress.
이영돈,고환봉,김형배,박인석,이정재 제주대학교 해양연구소 1993 해양자원연구소연구보고 Vol.17 No.-
Studies and reviews have been based on sex reversal diagnosis of histological change and body color change by sexual dimorphism on protogynous hermaphrodite fish, Labridae, Serranidae inhabited at the costal area of Chejudo. Korea Halichorens poecilopterus, Pleragoguw flagellifera and H. teruispinis were summer season, spawing species which mainly spawn in Jun and July, but Pseudolobrus japonicus was autumn season spawing species which mainly spawn in October and November, The standard length range of sex reversal were 13.0-15.0cm H. poecilopterus 9.5-15.0cm P. flagellifer, 11.5-16.0 cm P. japonicus and 10.0-13.0cm (total length) H. teraispinis respectively. Sex reversal mainly appeared before and after spawing season. H. Poecilogterus, H. terusispirus and P. japonicus were composed of monandry and diantry, but P.flagellifera was diandry. By sex reversal, the body colors of H. poecilopterus, P.flagellifera and P. japoricus change from pale red or yellow lines to brilliant green or dark yellow lines. The body colors of H. tenurisspirnis change slight, but containe lateral stripe pattern and blue spot in body center. In P. flagellifera, 1st, 2nd spine process of dosal fin were grown with body colour change. In sex reversal process, histological change of Labridae of inner gonad showed development of various interstitial cells and blood vessel by degeneration of oocyte. Thereafter, spermatogonia and spermatocyte begin to appear at the inner edge regions of the ovarian lamellae and then converted from ovary to functional testis. Epinephelus moara of 30.0~92.3cm in TL, E. Septemfasciatus of 23.4~38.7cm in TL were female with contained oocyte of perinucleolus stage. E akaara of 22.0~33.0cm in TL appeared individuals of ovotestis.
연령에 따른 태권도 수련자와 비수련자에 대한 체격, 체구성 및 체력요인의 변화에 대한 비교
김형돈,장완성 慶熙大學校 社會體育硏究所 1998 體育科學論叢 Vol.- No.11
The purpose of this study was to investigate the differences of physique, body composition and physical fitness between the taekwondo trainees and non-trainees. The subjects consist of two experimental groups and two control groups. The experimental groups were trained for 1 to 2 year. According to the result of the study following conclusions were suggested: Group B revealed more significant difference in all the physical aspects than Group A. There were significant differences in the mean ration of flexibility within each comparison group(p<.05) With the mean ratio of physical efficiency index, Group B's index is 13.09% higher than Group A and has significant difference in statistics. No significant differences were found in the rest of the factors of physical fitness although Taekwondo trainee showed better scores in most of physical fitness test.
제 1 소구치 발치를 동반한 제 Ⅰ 급 치조성 양악 전돌 환자의 치료 전·후 비교에 관한 연구
김형돈,박영철 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.1
The purposes of present study were to evaluate changes in models and lateral cephalometric head films during orthodontic treatment and to compare the amount of incisal retraction and anterior movement of molars with the two approaches of the retraction method of canine(sectional canine retraction vs sliding canine retraction) and the anchorage management(head gears vs no head gears, transpalatal arches vs no transpalatal arches and relation arches vs no relation arches) and to evaluate changes during orthodontic treatment in models with relation to lateral cephalometric head films. 67 Korean women with Angle's Class Ⅰ bialveolar protrusion were selected, whose initial chronologic age was above 16 yrs. Models and lateral cephalometric head films were taken before and after orthodontic treatment with four bicuspid extraction, the results were obtained as follows : 1. Significant decreases were observed in intermolar width, arch length and arch perimeter of maxilla and mandible but significant difference was not observed in intercanine width of maxilla and mandible during treatment period. 2. The linear change of the upper incisor to upper lip was 2.84:1 and the linear change of the lower incisor to lower lip was 1.45:1. 3. There were no significant differences between the two groups(sectional canine retractions vs sliding canine retractions), the two groups(transpalatal arches vs no transpalatal arches) and the two groups(lingual arches vs no lingual arches) in the amount of incisal retraction and anterior movement of molars. There were a greater amount of maxillary incisal retraction and a lesser amount of anterior movement of maxillary molars with the use of head gears than no use of head gears. 4. Changes during orthodontic treatment in models with relation to lateral cephalometric head films were obtained as follows : 1) Maxilla Central incisors were moved 3.79㎜ backward, canines were 0.22㎜ laterally and 3.70㎜ backward, and molars were moved 0.535㎜ medially and 2.29㎜ forward. 2) Mandible Central incisors were moved 3.04㎜ backward, canines were 0.145㎜ laterally and 3.92㎜ backward, and molars were moved 0.755㎜ medially and 1.17㎜ forward.
2-Bromopropane이 암컷 골든 햄스터의 생식기능에 미치는 영향
최돈찬,최형재,박창은 龍仁大學校 2000 용인대학교 논문집 Vol.18 No.-
Ovarian dysfunction induced by 2-bromopropane(2-BP) has been described in female factory workers and experimental animals. However, the underlying mechanism is still unclear. 2-BP is the possible causative chemical for reproductive and hematopoietic toxicity. To clarify the effect of 2-BP on the female reproductive function, repeated doses of 2-BP were administered to female golden hamsters for 24 days. Following 2 completed estrous cycles, animals received subcutaneously vehicle(corn oil), 80mg/kg, 400mg/kg, 2000mg/kg of 2-BP for 8 days. The females were then mated with males. The treatment continued for a gestation period(16 days). Dams treated with 2-BP showed a significant decrease in body weight. 2-BP decreased the fertility and tended to decrease the number of pups born and the rate of pregnancy, depending on the dose. The eccentric pyknotic cells, shrinkage of oocyte, and scattered cells were appealed in the middle and higher dose groups. The results indicate that reproductive toxicity induced by 2-BP was dose-dependent in that the higher doses exhibited more severe toxicity than the lower doses in our 24-day repeated dose experiments. Thus, 2-BP as a endocrine disrupter affects female reproductive activity to cause the destruction of primordial follicle and its oocyte in the ovary.
일반 측방 두부규격 방사선사진과 측방 두부규격 전산화 방사선사진에서의 계측점의 신뢰도에 대한 비교 연구
김형돈,박창서,김기덕 大韓口腔顎顔面 放射線學會 1997 Imaging Science in Dentistry Vol.27 No.1
The purpose of this study was to compare & to find out the variability of head film measurements(landmarks identification) between Fuji computed radiographic cephalometry and conventional cephalometry. 28 Korean adults were selected. Lateral cephalometric FCR film and conventional cephalometric film of each subject was taken. Four investigators identified 24 cephalometric landmarks on lateral cephalometric FCR film and conventional cephalometric film. The comparable measurements between lateral cephalometric FCR film and conventional cephalometric film were statistically analysed. The results were as follows: 1. In FCR film & conventional film, coefficient of variation (C.V.) of 24 landmarks was taken horizontally & vertically. There is no significant difference of rank order of landmarks in C.V. between two films. 2. In comparison of significant differences of landmarks variability between FCR film & conventional film, horizontal value of coefficient of variation showed significant differences in four landmarks among twenty-four landmarks, but vertical value of coefficient of variation showed significant differences in sixteen landmarks among twenty-four landmarks. FCR film showed significantly less variability than conventional film in 17 subjects among 20(4+16) subjects that showed significant difference.
쏘가리, Siniperca scherzeri의 광주기와 수온에 의한 산란유도
김형배,이영돈 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
To induce synchronized maturation of mandarin fish. Sinipeca scherzeri by controlling photoperiod and water temperature. experimental fishes were maintained in filtered recirculating tanks and exposed to three experimental condition. control. 23%-16L8D. and 20%-16L8D over 70 days. The data indicated that maturation in female are effectively induced at 23%-16L8D. Mean gonadosomatic index (GSI) of the fishes held at 23% -16L8D was much highest 10.85 than the GSI of the control. 1.88. For sexual maturation of mandarin fish. photoperiod was believed to be a prime factor and water temperature was a compensative factor.
김형근,성호경,이상돈 중앙대학교 의과대학 의과학연구소 1975 中央醫大誌 Vol.1 No.1
Effect of adrenalectomy on lithium distribution in various tissues of rats was studied. Rats were divided into three groups; namely, untreated, Li treated, and Li treated after adrenalectomy was done on 3rd dat prior to lithium treatment. Animals were killed following lithium treatment, and tissues including blood were taken immediately and digested and Li and Na concentrations were measured by atomic absorption spectroscopy. Effect of adrenalectomy on lithium distribution in various tissues was abserved, e. g. : brain skeletal muscle, bone, liver, renal cortex, cardiac muscle as well as plasma and erythrocyte. Correlations of Li concentrations were analyzed for each tissues. Results were smmarized as follows: 1. Adrenalectomy resulted an increase of lithium concentrations of various tissues in rats. 2. Erythrocyte to plasma ratio of lithium concentration was elevated in adrenalectomized rats, and it was considered that Li passed fairly well into cell under the adrenalectomy. 3. Adrenalectomy promoted the lithium retention in some tissues, especially bone, skeletal muscle and brain. 4. No correlation between tissues Li and Na was observed every tissues examined. 5. Lithium retention mechanism and pattern of distribution in some tissues of adrenalectomized rats were discussed.