치아표면 처리방법과 thernocycling이 콤포짓트 레진 코어의 미세누출에 미치는 영향

임용철,진태호,Lim, Yong-Chul,Jin, Tai-Ho 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.2

The purpose of this study was to compare the microleakage of the composite resin cores according to surface treatment, dentin bonding agents, and thermocycling. For this study, 120 extracted premolar teeth were used. Flat occlusal surfaces were prepared with diamond disk, and treated with air-abrasion, acid-etching, combination. The composite resin core was built with Z-100 after application of Scotchbond Multi-Purpose and All-Bond 2. Prepared specimens were thermocycled for 2,000 cycles. Specimens were immersed in 1% methylene blue solution for 24hours at $37^{\circ}C$. The microleakage was measured with a inverted metallurgical microscope(BHS313, Olympus, Japan). The following conclusions were drawn from this study: 1. The microleakages in the groups treated with air-abrasion and with acid etching were greater than that of the groups treated with combination method before thermocycling(p<0.05), the microleakages of the groups treated with air-abrasion were greater than that of the groups treated with acid-etching and combination method after thermocycling(p<0.05) 2. There were no significant difference between groups using Scotchbond Multi-Purpose and the groups using All-Bond 2. 3. Thermocycling didn't affect the change of microleakage in all cases.

가상현실 콘텐츠 용 MPEG-V 후각효과 기초 연구

임용철(Yong-Chul Lim),김상균(Sang-Kyun Kim),이영미(YoungMi Lee) 한국방송·미디어공학회 2017 방송공학회논문지 Vol.22 No.5

This paper introduces a system to reproduce the olfactory effect using the MPEG-V (ISO / IEC 23005) standard to verify the reliability of the fragrance used in the olfactory experiment Using the implemented system, with experiment participant wearing HMD(Head Mounted Display), we carried out one-to-one matching of aroma and scent object images, matching images of aroma and many scent objects, matching of aroma and fragrance object images, and analyzing distance preference. The results of the experiment showed that aroma of coffee, cocoa, banana, and peach aroma is suitable scent for testing. In case of coffee aroma with high matching accuracy, 10 ~ 20cm distance between smell and participant was more effective in image matching than 30cm. In the future, we can conduct the olfactory research for enhancing the sense of immersion and presence of virtual reality contents using the selected fragrance.

양수막을 통한 수분유출 기간 중 Li 이동에 미치는 항이뇨호르몬 및 Prolaction의 영향

임용철 ( Yong Chul Lim ),최석태 ( Seok Tae Choi ),박노현 ( Noh Hyun Park ),신희철 ( Hee Chul Syn ),성호경 ( Ho Kyung Sung ) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.12

In order to investigate the effects of vasopressin and prolactin on the regulation of amniotic fluid volume and sodium concentration in pregnant rabbits, lithium transport as an index of sodium transport and amniotic fluid volume regulation through amniotic membrane was studied. Pregant rabbits were anaesthetised with pentobarbital (30mg/kg) and exposed uterus. To exclude possible contamination of residual hormone in amniotic fluid, 70 % of amniotic volume were replaced by isotonic saline. Isotonic saline (0.5ml) containing 0.5mg of congo red and 15mM of LiCl was injected into each amniotic sac. Amniotic fluid samples were taken in 30 and 60 minutes after saline injection and measured Na+, Li+ and congo red concen1rations. Only the amniotic samples which showed the decrease in congo red concentration after 30 or 60 minutes were chosen to analyse in this study. Vasopressin (25ng) or prolactin (1mg) was injected into experimental amniotic sacs and measuerd Na+, Li+, congo red and amniotic fluid volume as in control group. Then the rate of water efflux, Li-and Na-influx and efflux were ana1ysed and compared. The results were obtained as follows; 1) The efflux ratio of Na+ to water in amniotic fluid was relatively constant (about 95 %) in control, which was independent from the magnitude of water efflux rate. The efflux ratio of lithium to water, however, increased from 20 % with the increase of the magnitude of water efflux. 2) In vasopressin injected group, the water efflux rate was decreased than in control group and the efflux ratio of Na+ to water was not consistent (sometimes decreased or increased). On the other hand the efflux ratio of Li+ to water was in the same range as in control when the water efflux rate was in the range of control value, however, it profoundly increased when the water efflux rate was below 10%. 3) In prolactin treated group, the water efflux rate was very high when the initial Na+ concentration was low. The influx or efflux of Li+ was very large independently from the magnitude of water efflux rate or from initial Na+ concentration probably due to vigorous diffusion. From the above results, it is suggested that vasopressin inhibit the increase of the amniotic fluid volume during fetal urination and maintain Na+ concentration of the amniotic fluid not through the direct effect on the amniotic membrane, but thorugh the effect on fetal kidney. On the other hand, prolactin regulates Na+ concentration of the amniotic fluid very rapidly by the increase of diffusion of monovalent cations through the amniotic membrane.

UWV 영상제작을 위한 효과적인 동영상 촬영 방법 및 동영상 스티칭 방법 연구

임용철(Yong-Chul Lim),이경식(Kyoung-Sik Lee),김상균(Sang-Kyun Kim) 한국방송·미디어공학회 2017 한국방송공학회 학술발표대회 논문집 Vol.2017 No.11

백서 소장 점막 이당류 분해 효소 순응에 대한 연구

임경욱(Kyong Wook Yim),고광철(Kwang Chul Koh),김유철(Yoo Chul Kim),임용철(Yong Chul Lim),이효석(Hyo Suk Lee),윤용범(Yong Bum Yoon),송인성(In Sung Song),김정룡(Chung Yong Kim) 대한내과학회 1988 대한내과학회지 Vol.35 No.1

N/A There is plenty of evidence that the intestinal disaccharidases such as sucrase and maltase are adaptive by their substrates. However the intestinal lactase adaptiveness is still controversial despite results which positively suggest its adaptiveness in young experimental animals. The authors designed the following experiment with six groups of adult Wistar rats, each of which consists of ten 210 g average adult rats, to investigate whether dietary lactose solutions would increase the intestinal lactase specific acitivity and to observe the effects of various dietary solutions on other intestinal enzyme specific activities at the same time. All of the animals were fed by standard rat chow ad libitum and the first group (control) was made to suck tap water the second group a 5% glucose solution, the third group a 10 sucrose solution, and the fourth, fifth, and sixth groups 5%-, 10%- and 15% lactose solutions respectively, also ad libitum as the fluid source for a six week period. At the end of the experiment, the small intestines were divided into three segments of equal length from the Treitz ligament to the terminal ileum, from each of which one tissue section was made and specific enzyme activities (lactase, sucrase, trehalase, alkaline phosphatase and aminopeptidase N) were assayed. The results were as follows: 1) There was no difference in mean body weight during the experimental period. (mean±S.D; 230±12.3) 2) No histological differences between the groups were noted in each of the three segments. 3) The intestinal trehalase, alkaline phosphatase, aminopeotidase N, and lactase, which was the key enzyme of this experiment, were not adapted by these experimental solutions. 4) The intestinal sucrase specitic activities, especially of the middle segment, from animals fed with 5% glucose, 10% sucrose, 10%-and 15%-lactose solutions, in- creased from a control group value of 41.8±18.4 to 72.1±15.1, 73.0±12.0, 71.3±24.9 and 66.4±11.0mu/mg protein (p<0.01 in all) respectively, confirming again its adaptiveness. We concluded that the intestinal lactase was not adapted by these 5-15% lactose solutions in six weeks, To the contrary, the sucrase was adapted by various carbohydrate solutions which suggested that the adaptation was substrate non-specific and was by local effect rather than distant hormonal or neural effects.

간경변 (肝硬變) 환자와 (患者) 이와 동반된 간암 (肝癌) 환자에서의 혈중 Estrogen 과 Testosterone 치에 대한 연구

윤용범(Yong Bum Yoon),송인성(In Sung Song),김정룡(Chung Yong Kim),이효석(Hyo Suk Lee),이동호(Dong Ho Lee),박중원(Joong won Park),임용철(Yong Chul Lim) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.1

N/A The purpose of this study was to evaluate whether or not estrogen acts as promoter or initiator of primary liver cancer in liver cirrhosis. The serum levels of estrone (E1), estradiol (E2), estriol (E3) and testosterone were estimated by radioimmunoassay in twenty men of liver cirrhosis (LC) and twenty men of primary liver cancer (PLCa) with liver cirrhosis. The results were summerized as following 1) Serum El was 7.90+3.22 ng/dl in the patient of LC and 6.02+0.88 ng/dl in the patient of PLCa with LC. There was statistically significant difference between two goups (p<0.05). 2) Serum E2 was below 10 pg/ml in both group of patient of LC and PLCa with LC. 3) Serum E3 was 4.33+2.34 ng/ml in the patient of LC and 6.78+6.87 ng/ml in the patient of PLCa with LC. There was no statistically significant difference between two groups (p>0.05). 4) Serum testosterone and El/testosterone ratio was 2.26+1.43ng/ml, 9.13+19.8 in the patient of LC and 2.86+1.90 ng/ml, 6.40+13.1 in the patient of PLCa with LC. There was no statistically significant difference between two groups (p>0.05). 5) The comparison of liver function test and Childs classification in both group showed more poor condition in the patient of LC than those of PLCa with LC. These results suggested that serum levels of E2, E3, testosterone and El/testosterone ratio are not significantly different in the patient of LC and PLCa with LC and increase of serum E1 level observed in the patient of LC is probably due to more poor liver function. These results also suggested that estrogen does not seem to have the role of hepatic carcinogenesis at least in men of HBsAg positive nonalcoholic cirrhosis in Korea.

호모그래피 행렬과 센서 데이터를 활용한 동영상 스티칭 방법

김민우(Minwoo Kim),임용철(Yong-Chul Lim),김상균(Sang-Kyun Kim) 한국방송·미디어공학회 2017 한국방송공학회 학술발표대회 논문집 Vol.2017 No.6

본 논문은 동영상 스티칭의 속도·정확도를 향상시키기 위해 호모그래피 행렬 생성과 센서 데이터 활용을 통한 동영상 스티칭 방법을 제안한다. 본 논문에서는 임의의 호모그래피 행렬을 선형으로 생성하여 이미지를 스티칭 하는 방법을 설명하고, 이 과정에서 스티칭 정확도가 낮아지는 단점을 센서 데이터 활용을 통해 보완하는 방법을 소개한다. 1만 쌍의 모든 프레임에서 호모그래피 행렬을 생성 시키는 방법과 본 논문에 제안한 임의의 호모그래피 생성 방법을 비교하였을 때 평균 2.6초 걸리는 스티칭 시간을 약 1.5초 단축시켜 빠른 스티칭을 가능하게 하였다. 또한 선형 호모그래피 행렬만을 사용한 스티칭 한 결과보다 선형 호모그래피 행렬과 센서데이터를 함께 사용하였을 때의 정확도가 28.2% 개선되었음을 확인하였다.

치아표면 처리방법과 thermocycling이 콤포짓트 레진 코어의 미세누출에 미치는 영향

임용철,진태호 원광대학교 치의학연구소 1999 圓光齒醫學 Vol.9 No.2

The purpose of this study was to compare the microleakage of the composite resin cores according to surface treatment, dentin bonding agents, and thermocycling. For this study, 120 extracted premolar teeth were used. Flat occlusal surfaces were prepared with diamond disk, and treated with air-abrasion, acid-etching, combination. The composite resin core was built with Z-100 after application of Scotchbond Multi-Purpose and All-Bond 2. Prepared specimens were thermocycled for 2,000 cycles. Specimens were immersed in 1% methylene blue solution for 24 hours at 37'C. The microleakage was measured with a inverted metallurgical microscope(BHS313, Olympus, Japan). The following conclusions were drawn from this study: 1. The microleakages in the groups treated with air-abrasion and with acid-etching were greater than that of the groups treated with combination method before thermocycling(p<0.05), the microleakages of the groups treated with air-abrasion were greater than that of the groups treated with acid-etching and combination method after thermocycling(p<0.05). 2. There were no significant difference between groups using Scotchbond Multi-Purpose and the groups using All-Bond 2. 3. Thermocycling didn't affect the change of microleakage in all cases.