치아 우식증의 조기 진단을 위한 QLF-D 개발

박형주,김종수,유승훈,신지선 大韓小兒齒科學會 2011 大韓小兒齒科學會誌 Vol.38 No.4

QLF-D system composed with DSLR(digital single-lens reflex) camera, and the images of natural enamel caries and artificial caries was developed from 2 days to 14 days captured by QLF-D system. The correlation between lesion depth of the polarized microscope and luminosity ratio of QLF-D image was analyzed and the results were summarized as follows: 1. The Pearson correlation value between the lesion depth of polarized microscope images and luminosity ratio of QLF-D images was 0.969(p<0.01). 2. From Regression analysis of lesion depth from polarized image by demineralized period, the equation was y = 8.67x - 1.16(p<0.05). 3. From Regression analysis of luminosity ratio from QLF-D image by demineralized period, the equation was y = 3.53x + 6.42(p<0.05). From the results, QLF-D system can detect the enamel caries at the very early stage and can monitor the progression of demineralization and remineralization. For the convenient use of QLF-D system in the laboratory, the image analysing software was needed to analyze of interest site of enamel caries lesion. 저자는 DSLR(digital single-lens reflex) 카메라를 이용한 QLF-D 시스템을 고안하여, 사람의 유구치에 자연 발생된 법 랑질 초기 우식증을 관찰하고, 유구치 법랑질 시편을 대상으로 2일부터 14일까지 인공 탈회시킨 후 탈회 기간에 따른 상관관 계를 편광 현미경 소견과 비교 분석한 결과 다음과 같은 결과를 얻었다. 1. 탈회 기간에 따른 편광 현미경 상의 병소 깊이와 QLF-D 영상의 광밀도 값 비율 간의 피어슨 상관 계수는 0.969였다 (p<0.01). 2. 편광현미경에서 측정된 병소 깊이의 탈회 기간에 대한 회귀분석 결과 y=8.67x-1.16의 회귀 방정식이 산출되었다 (p<0.05). 3. QLF-D 영상에서 측정된 광도값 비율의 탈회 기간에 대한 회귀분석 결과 y=3.53x+6.42의 회귀 방정식이 산출되었다 (p<0.05).

Binding Energy of Oxigen and Methane Adsorbed on Bundles of Open-Ended Single-Wall Carbon Nanotubes

서주연,유대황,곽진성,황윤회,김형국 부산대학교 유전체물성연구소 2004 유전체 논문집 Vol.3 No.

The adsorption of oxygen and methane on the bundles of open-ended single wall carbon nanotube(SWNT) was studied using the volumetric adsorption qst was obtained from the adsorption isotherm measurements performed at different temperatures. The trend in the values of the methane isosteric heat of adsorption showed three regions, representative of the adsorption on the different types of adsorption sites. In case of oxygen, on the other hand, such distinguishable regions were not appeared in the N-qst graph. From the results of qst the binding energies of oxygen and methane adsorbed on open-ended SWITs were estimated.

Poly(ρ-phenylenesulfide)와 Poly(ρ-phenylene)으로부터 제조된 탄소의 리튬 이온 2차전지 anode 재료로서의 전기화학적 특성

유덕영,이주성,박수길,변지형,류신환,정윤이 한양대학교 에너지·환경기술연구소 1998 에너지·環境技術論文集 Vol.4 No.-

Poly(p-phenylenesulfide)와 poly(p-phenylene)으로부터 제조된 탄소를 리튬이온 2차전지용 음극재료로 사용하여 전기화학적특성을 연구하였다. 이들 고분자들을 질소 분위기하에서 승온속도 2℃/min로 1000℃까지 상승시킨 후, 1시간 동안 탄화시켜 탄소를 제조하였다. Poly(p-phenylene)으로부터 제조된 탄소가 보다 더 규칙적인 구조를 가지기 때문에 Poly(p-phenylenesulfide)으로부터 제조된 탄소보다 더 많은 용량과 충방전 효율을 나타내었다. 수산화리튬과 염화주석(Ⅱ)을 첨가하여 용량의 증가와 충방전 효율의 증가를 가져올 수 있었다. 이중에서 poly(p-phenylene)에 염화주석(Ⅱ)을 첨가시켜 제조된 탄소가 가장 큰 충방전 용량과 충방전 효율의 향상을 가져왔다. Carbon inaterials manufactured from poly(p-phenylene sulfide) and poly(p-phenylene), were studied on electrochemical characteristics as anode materials for lithium ion secondary battery. These polymer precursors were heat treated for 1hr at 1000℃ with the rate 2℃/min under nitrogen atmosphere. Carbon manufactured from poly(p-phenylene) showed higher capacity and coulomb efficiency of charge/discharge than carbon from poly(p-phenylene sulfide) because the former has better ordered structure. Carbon manufactured from polymer precursors adding stannous chloride or lithium hydroxide showed higher capacity and better efficiency of charge/discharge. Also, carbon manufactured by adding stannous chloride to poly(p-phenylene) showed the highest capacity and efficiency of charge/discharge.

家族生活週期 模型設定과 住居意識 및 行動에 關한 硏究

劉永珠,洪亨沃 慶熙大學校 1983 論文集 Vol.12 No.-

The purpose of this study is to make a model of Family Life Cycle in Korea now & to find factors for housing consciousness and behavior and to analyze the relationship between housing life cycle and the total housing satisfaction. Ⅰ. Answers to a queationnaire were collected from 724 housewives in seoul area, 232 housewives in big cities, 203 housewives in small cities. The questionnaire contained 10 items about family situations. Analyzing methods employed for modeling of family life cycle are frequency family situations. Analyzing methods employed for modeling of family life cycle are frequency, percentage, X^2-test. Results and findings are as follows: (1) The mean of first marriage age is 22.4 yrs old. 23.5 yrs old is the result of statistical materials published by E.P.B. 1975. The age of first marriage is higher according to the age, education & residential area. (2) The mean of first baby bearing age is 24.2 yrs old (generally 1 year after marriage). This age is the same as the result of statistical materials published by E.P.B. (3) The mean of last baby bearing age is 32.6 yrs old compared to the E.P.B. statistical materials 3 yrs low. This age is very different according to the age, education & residential area. (4) The mean of first child marriage age is 46.4 yrs old compared to the E.P.B. statistical materials 2.5 yrs old low. (5) The mean of last marriage age is 52.7 yrs old. This age is also 2.3 yrs low compared to the result of E.P.B. materials. (6) The number of child & interval is quite different according to the result of family planning education generation or not. (7) According to the wife's employment, it does not show any difference. (8) The result of analyzing by F.L.C., we don't have launching stage & middle age stage apparently. So, We can make model of F.L.C. in Korea as follows. (it will be change) (1) Establishment stage; from marriage to first baby born. (23 yrs old-24 yrs old) (2) Child bearing & rearing stage; from first baby born to first child enter primary school (24 yrs old-30 yrs old) (3) Child education stage; from first child primary school to high school graduation (30 yrs old-42 yrs old) (4) Child adult stage; from first child got army, college or stay at home(42 yrs old-48 yrs old) (5) Child adult stage; from first child marriage to last child marriage(48 yrs old-57 yrs old) (6) Aging stage; from last child marriage to self dying (57 yrs old after) Ⅱ. Answers to a questionnaire for a study Housing were collected from 623 housewives in seoul area. The questionnaire contained 26 items on housing characteristics of housing needs and housing values with some background questions. Each respondent was asked to evaluate the importance of characteristics as well as her evaluation on that characteristics by giving 1-3 points. The degree of housing satisfaction on each characteristics was calculated by multiplying the points for the importance the characteristics by that for her own house. Following statistical methods were employed to analyze the findings. (1) Factor analysis technique was used in analyzing the results on the importance and satisfaction to find the underlying concept on the housing consciousness and behavior. (2) The factors on housing mobility push and pull were crosstabulated for X^2-test with housing life cycle. (3) Analysis of variance technique was adopted to find the variance of the housing total satisfaction due to the selected independant variables. The conclusions derived from the interview and the statistical analysis are as follows; (1) It was found that the degree of satisfaction is better criterion for the underlying concept of housing consciousness and behavior than the degree of importance for housing characteristics. (2) The important factors for the housing consciousness and behavior are ① Family centrism―Quality of Housing ② Location ③ Social Prestage ④ Maintenance ⑤ Personal Values ⑥ Neighborhood Physical Environment ⑦ Neighborhood Social Environment, in order of importance. These factors comprise 54% in interpreting the housing consciousness and behavior. (3) The family centrism was the strongest housing consciousness and behavior factor among others for housing characteristics contained in the underlying concept, Family Centrism are the affordability and rooms available for the privacy. (4) The housing push and pull factors vary according to the housing life cycle. Location(distance to work) is the pull factor during the period of family establishment, and Neighborhood Physical Environment (availability for better enducation) pull as well as push factor. The majority of the housewives chose house for Location (distance to work), and want to move for the reason for Neighborhood Physical Environment (better education for the children) during the period for chilren's education. After the children have grown up, Neighborhood Physical Environment determines the housing pull and push factors. Push characteristic during the period change to tranquility from the better environment of the children's education. (5) Significant correlation was found between tenure and total housing satisfaction from t-test by significance level P<.001. (6) Covariance with the total housing satisfaction with selected independent variables are recognized p<.05 for educational level, p<.01 for period of residence and age, and p<.001 for income and size of the house. On the other hand the frequency of mobility and family life cycle with the total housing satisfaction didn't show covariant relationships under statistically significant level. The findings in this study can be utilized in the future studies on the housing consciousness and behavior in detail. For the purpose a continued study is suggested.

리튬 이온 2차전지용 Anode 재료의 제조와 그 특성 고찰

이주성,정윤이,변지형,박은성,유덕영 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-

Carbon materials, disordered carbon and KS6(graphite, Lonza), were studied as anode materials of lithium ion secondary battery. The disordered carbons were made from thermosetting resins (phenol resin, furan resin, acetylene resin and its mixed resin). The resins were carbonized in nitrogen gas at 1000℃. When the thermosetting resins were carbonized, an addition of lithium hydroxide improved capacity and cycle life, but decreased the efficiency of the first charge/discharge. Also, in this study, the capacity of the carbon from phenol resin was higher than that of the carbon from acetylene resin or furan resin. But, the carbon from mixed resin was the highest capacity of all the synthetic carbons.

Cadmium이 넙치(Paralichthys olivaceus)의 면역 반응에 미치는 영향

변주영,유민호,전려진,이형호,정현도 한국어병학회 2001 한국어병학회지 Vol.14 No.2

어류의 면역반응에 대한 cadmium (Cd)의 영향을 분석하기 위하여 넙치 (Paralichthys olivaceus)를 각기 다른 방향으로 Cd에 노출시킨 후 특이적 면역반응의 변화와 Edrwrdsiella tarda KFE (E. tarda KFE)의 인위감염에 대한 저항성을 분석하였다. E. tarda KFE의 formalin killed cell (FKC)로 면역시키기 2주전부터 계속하여 실험 기간동안 침지법으로 Cd(20ppb)에 노출된 시험구는 노출되지 않은 시험구와 양성 대조구보다 혈청 내 특이 항체가가 빠르게 최고치에 이르렀으나, 감소속도는 노출시키지 않은 양성 대조구에 비하여 빠른 것으로 나타났다. 이러한 경향은 splenocytes를 ELISPOT-assay (enzyme-linked immunospot assay)를 이용하여 특이 항체 생성 세포 (specific antibody secreting cell, SASC) 수를 분석해 보았을 때에도 동일하게 나타났다. 그러나 면역 전 2주 동안만 Cd에 노출시킨 시험구에서는 혈청내 항체생성 결과와는 달리 증가된 SASC의 수를 보여 주었다. 그리고 면역 2주 전부터 실험 전기간동안 계속해서 Cd에 노출시킨 넙치를 대상으로 하여 E. tarda FKC 생균으로 인위 감염시켰을 때 100% 폐사율을 보여 주었다. 이것은 Cd에 지속적으로 노출된 어류에서의 방어 체계는 면역반응뿐만 아니라 독성효과도 함께 고려되어야 하는 복합적인 것임을 확인 할 수 있었다. Olive flounder, Paralichthys olivaceus known as an one of the major aquacultured species in Korea were exposed to cadmium(Cd) with different protocols and analyzed the effects of exposure on the immune response. Antibody levels in sera of the group exposed to Cd(20ppb) by immersion method from 2 weeks before immuniztion with formalinised Edwardsiella tarda(E. tarda) KFE entigen to the end of experiment reached to peak level faster than that of the non-exposed group. After this peaking time the levels decreased much at a faster rate compared to the non-exposed group. This tendency was also appeared in the numbers of specific antibody secreting cells(SASC) analyzed with the enzyme-linked immunospot (ELISPOT)-assay technique in the splenocytes of the experimental groups exposed to Cd with different ways. Interestingly, the group exposed to Cd for 2 weeks before immunization also showed increased numbers of SASC unlikely the antibody production and suggested a more critical influence of cadmium exposure in early stage of immune reaction. Artificial infection with live E. tarda KFE induces 100% mortality in the flounder exposed to cadmium throughout the experimental period from two weeks before the immunization. It may imply that some other factors related to specific immunity are involving in the defence system of flounder exposed to Cd. Taked together. Cd exposure may induce temporaily stimulatory or indhibitory effects on the immune reaction, but suppress the physiological systems for the resistant against the infective agents with other toxic effects.

Manipulation under Anesthesia for Stiffness after Total Knee Arthroplasty

( Ju Hyung Yoo ),( Jin Cheol Oh ),( Hyun Cheol Oh ),( Sang Hoon Park ) 대한슬관절학회 2015 대한슬관절학회지 Vol.27 No.4

Purpose: This study evaluated the incidence of manipulation under anesthesia (MUA) for stiffness after total knee arthroplasty (TKA) and the degree of joint motion recovery after MUA. Materials and Methods: A total of 4,449 TKAs (2,973 patients) were performed between March 2000 and August 2014. Cases that underwent MUA for stiffness after TKA were reviewed. TKAs were performed using the conventional procedure in 329 cases and using the minimally invasive procedure in 4,120 cases. The preoperative range of joint motion, timing of manipulation, diagnosis and the range of joint motion before and after MUA were retrospectively investigated. Results: MUA was carried out in 22 cases (16 patients), resulting in the incidence of 0.5%. The incidence after the conventional procedure was 1.2% and 0.4% after the minimally invasive procedure. In the manipulated knees, the preoperative range of motion (ROM) was 102.5o±26.7o, and the preoperative diagnosis was osteoarthritis in 19 cases, rheumatoid arthritis in two, and infection sequela in one. MUA was performed 4.7±3.0 weeks after TKA. The average ROM was 64.5o±13.5o before manipulation. At an average of 64.3±41.3 months after manipulation, the ROM was recovered to 113.4o±31.2o, which was an additional 49.9o improvement in flexion. Conclusions: The satisfactory recovery of joint movement was achieved when MUA for stiffness was performed relatively early after TKA.

Minimum 5-year Follow-up Results of Minimally Invasive Total Knee Arthroplasty Using Mini-Keel Modular Tibial Implant

( Ju Hyung Yoo ),( Byoung Kyu Park ),( Chang Dong Han ),( Hyun Cheol Oh ),( Sang Hoon Park ) 대한슬관절학회 2014 대한슬관절학회지 Vol.26 No.3

Purpose: To evaluate the minimum 5-year mid-term clinical and radiological results of minimally invasive surgery total knee arthroplasty (MIS-TKA) using a mini-keel modular tibia component.Materials and Methods: We retrospectively evaluated 254 patients (361 cases) who underwent MIS-TKA between 2005 and 2006. The latest clinical and radiological assessments were done in 168 cases that had been followed on an outpatient basis for more than 5 postoperative years. Clinical results were assessed using the Hospital for Special Surgery (HSS) score and Knee Society score. Radiological evaluation included measurements of knee alignment.Results: The average postoperative knee range of motion and HSS score were 134.3o±12.4o and 92.7o±7.0o, respectively. The average postoperative femorotibial angle and tibial component alignment angle were 5.2o±1.7o valgus and 90.2o±1.6o, respectively. The average tibial component posterior inclination was 4.8o±2.1o. The percentage of cases with tibial component alignment angle of 90o±3o was 96.1%, and that with the femorotibial angle of 6o±3o valgus was 94.0%. Radiolucent lines were observed in 20 cases (12.0%): around the femur, tibia, and patella in 14 cases, 10 cases, and 1 case, respectively. However, they were less than 2 mm and non-progressive in all cases. The survival rate was 99.4% and there was no implant-related revision.Conclusions: MIS-TKA using a mini-keel modular tibial plate showed satisfactory results, a high survival rate, and excellent clinical and radiological results in the mid-term follow-up.

Does Obesity Affect Clinical and Radiological Outcomes in Minimally Invasive Total Knee Arthroplasty? Minimum 5-Year Follow-up of Minimally Invasive TKA in Obese Patients

Ju-Hyung Yoo,오현철,Sang-Hoon Park,김진규,김상희 대한정형외과학회 2018 Clinics in Orthopedic Surgery Vol.10 No.3

Background: The aim of this study was to evaluate the clinical and radiological outcomes of minimally invasive total knee arthroplasty (MIS-TKA) in obese patients. Methods: We examined the records of 371 cases of MIS-TKA performed using the mini-midvastus approach from January 2006 to December 2006. According to body mass index (BMI), the cases were classified into group A (BMI < 25 kg/m2, 114 knees), group B (25 kg/m2 ≤ BMI < 30 kg/m2, 179 knees), and group C (BMI ≥ 30 kg/m2, 78 knees). Clinical outcomes were measured with the Hospital for Special Surgery Score and Knee Society Score. Radiological evaluation included measurements of knee alignment. Results: MIS-TKA was performed on all patients. The skin incision size in group A, group B, and group C was 8.2 ± 0.8 cm, 8.3 ± 0.8 cm, and 8.5 ± 0.9 cm, respectively, and the operation time was 86.4 ± 10.4 minutes, 85.9 ± 11.3 minutes, and 89.0 ± 11.4 minutes, respectively, indicating no significant difference among the groups (p > 0.05). There was no difference in terms of the accuracy of the tibial implant alignment, with 97.6%, 95.2%, and 93.4% of each group showing 90° ± 3° varus angulation (p > 0.05). With respect to the accuracy of the femorotibial angle, 93.9%, 94.6%, and 90.2% of each group had 6° ± 3° valgus angulation, with group C demonstrating the lowest level of accuracy (p < 0.05). The preoperative range of motion and Knee Society Score of group C were less than those of groups A and B (p < 0.05), but there was no notable difference among groups at the postoperative 3-month and 1-year follow-ups (p > 0.05). Conclusions: MIS-TKA in obese patients showed satisfactory clinical and radiological results without significant difference in surgical results compared to nonobese patients.

Treatment of Recurrent Hemarthrosis after Total Knee Arthroplasty

( Ju-hyung Yoo ),( Hyun-cheol Oh ),( Sang-hoon Park ),( Sanghyeon Lee ),( Yunjae Lee ),( Seong-hun Kim ) 대한슬관절학회 2018 대한슬관절학회지 Vol.30 No.2

Purpose: The purpose of this study is to evaluate the incidence and treatment of recurrent hemarthrosis after total knee replacement (TKR). Materials and Methods: Among a total of 5,510 patients who underwent TKR from March 2000 to October 2016, patients who had two or more bleeding 2 weeks after surgery were studied. Conservative treatments were performed for all cases with symptoms. In patients who did not respond to conservative treatment several times, embolization was performed. We retrospectively evaluated the postoperative bleeding time, bleeding frequency, treatment method, and outcome. Results: Seventeen (0.3%) of the 5,510 patients developed recurrent hemarthrosis. Bleeding occurred at an average of 2 years 3 months after the operation. Joint aspiration was performed 3.5 times (range, 2 to 10 times) on average, and 14 cases (82.3%) were treated with conservative treatment. In 3 patients with severe bleeding and hemorrhage, embolization was performed. Conclusions: Recurrent hemarthrosis after TKR is a rare disease with a low incidence of 0.3% and usually could be treated by conservative treatment. If recurrences occur repeatedly, embolization through angiography or surgical treatment may be considered, but the results are not satisfactory and careful selection of treatment modalities is warranted.