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김이성,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The purpose performance degradation of concrete structures is generally caused by deteriorations, such as surface collapse, pop-out, crack, and so on. It may result in serious defects of the concrete structures. Thus it is very important 세 detect and repair the defects of concrete structures within a proper time to assure the structural safety. However, the defects due to the deteriorations are usually difficult to find by visual inspection. A sensor is developed in this study, which may give early indication for degradation of concrete structures and show the location of the damage. Cracks can be defected by the liquid in a small glass capsules which are embedded in the concrete structures. This paper discusses the applicability of that was developed smart concrete.
가네트를 활용한 고강도콘크리트의 고온수열 후 잔존압축강도특성
김동익,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The study which it describes the high concrete which industrial by-product used garnet powder was quality of residual strength after heating. The test unit water content 160kg/m', water reunion ratio did with 30%, 35% and the aggregate ratio is 40%, 42%, 44%, displacement ratio admixture is 0%, 10%, 20%. Admixture garnet powder, fly ash, blast-furnace slag and it was compared with the residual strength of concrete after was heated to normal temperature, 50℃,100℃, 150℃, 200℃, 350℃, 500℃, 600℃, 800℃.With this test was got the next conclusion. To previously 350℃, the weight reduction was not big, it was visible the weight reduction which was sudden from 350℃, and it showed the aspect which also the compressive strength reduction is identical. It compared with admixture nothing replacement concrete, garnet replacement concrete relatively weight reduction and compressive reduction appeared small. Like this tendency recording where the replacement ratio will be increased the tendency which appeared relative small.
최정민,이송주,김부경,최영식,박요한,김정훈,허방 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1
The diffuse sclerosing variant (DSV) is a rare malignant tumour that accounts for 0.7-5.3% of all papillary thyroid cancers. DSV tends to occur at a younger age and has a higher incidence of cervical lymph node metastases, compared with papillary thyroid carcinoma. A 62-year-old female patient diagnosed thyroid nodule with diffuse and mild increased 18F-deoxy-glucose (FDG) on FDG positron emission tomography (PET)-computed tomogram (CT) scan. The ultrasound images showed typical findings of DSV such as diffusely enlarged thyroid lobes and diffusely scattered microcalcification. We performed this patient ultrasonography guided fine needle aspiration and cytologic analysis revealed papillary carcinoma. Total thyroidectomy with central compartment node dissection and lateral lymph node dissection was performed and finally diagnosed DVS. The authors report this case with literature review.
김요숙,정애진,강경화,김상철 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.4
치열 공간 부조화에 영향을 미치는 골격 및 치성요소를 알아보기 위하여 하악 치열궁내 총생을 보이는 성인 45명과 공극을 보이는 성인 39명의 Ⅰ급 부정 교합 환자와 정상적인 배열을 갖는 성인 40명을 선정하여 측모 두부방사선사진과 모형을 분석하여 다음과 같은 결론을 얻었다. 1.공극군보다 총생군의 ANB각이 컸다. 2.공극군보다 총생군이 하악골 및 상악골의 전하방 경사가 커서 안모의 수직적 양상이 심했다. 3. 총생군보다 공극군이 전두개저와 하악체 길이가 컸다. 4. ANB 각, 전안면 고경과 하악지 길이가 공간 부조화 양의 예측에 기여하며, 다음과 같은 회귀방정식이 산출되었다. space discrepancy = 46.51 - 2.51ANB - 0.58AFH + 0.65RH (R² = 0.40) The purpose of this study was to investigate the relationship between the space discrepancy of the mandibular dentition and craniofacial morphology in adults with good Angle class I occlusion. Dental casts of normal group, crowded group and spaced group were selected on the basis of dental crowding and spacing. Subjects with excessive space to accomodate the lower teeth were classified as spaced group(39). Subjects with a space discrepancy of more than 4mm were classified as crowded group(45). Normal subjects had little or no dental crowding and spacing(40). Various skeletodental measurements in lateral cephalograms were evaluated and compared by ANOVA, Pearson correlation analysis and multiple stepwise regression analysis. The results were as follows : 1. ANB angle was larger in crowded group than in spaced group. 2. Maxilla and mandible in crowded group were inclined more downward and forward than in spaced group, so crowded group was found to have vertical tendency. 3. Anterior cranial base length and mandibular body length were longer in spaced group than in crowded group. 4. According to the multiple stepwise regression analysis with space discrepancy as dependent variable, 40% of variance of space discrepancy could be explained by ANB angle, anterior facial height and ramus height. Multiple regression equation was as follows Space discrepancy=46.51-2.51ANB-0.58AFH+0.65RH
정현주,김예나,최영식,박요한 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1
Thyroid hemiagenesis is a rare congenital anomaly, in which one thyroid lobe fails to develop. It is reported that thyroid hemiagenesis associated with thyroid diseases such as Graves' disease, Hashimoto's thyroiditis, colloidal goiter and thyroid follicular and papillary cancer. However, Thyroid hemiagenesis associated Hashimoto's thyroiditis haven't reported in Korea. A 31-year-old female patient was clinically hypothyroid with a left-sided goiter. Hemiagenesis of right thyroid lobe indicated on 99mTc pertechnete scan and later confirmed on ultrasonography. The authors report this case with literature review.
고온에서의 steel-frame의 열응력 해석에 관한 연구
조경래,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
We are the actual circumstances which a steel building is expanding to the trend of the larger and the higher stories of a city building. but, A fire resistance of Steel is fallen at high temperature compared with RC structure building therefore it brings strength degradation and occurrence of the thermal stress eventually steel have fatal fault at proof against the fire performance. for example, we saw collapse of the WTC building by fire in New York. A method of analysis for the structural behavior of steel member including thermal and mechanical properties of steel member under elevated temperature, is formulated. This paper presents the result of investigation on the time-dependent behavior in steel frame and structure, under loads and elevated temperature. In this research I have developed a program to analyze the complex non-linear motivation of thermal stress under high temperature with stational theory. With the program which I had developed I have analyzed sorts of steel-structure elements and frames, and the conclusion listed then.
가네트를 활용한 고강도 콘크리트의 황산염저항성 특성 연구
윤종문,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The purpose of this study is about to characteristic of sulfate resist performance following precipitation age of high strength concrete using the garnet minute power. Experiment was compared to the weight change and compressive strength to follow that unit water content 160kg/m³, W/B 30%, 35% and fine aggregate ratio(S/A) 40%, 42%, 44%, admixture(garnet minute power. fly ash) 0%, 10%, 20% and precipitation age. We got the conclusion of the downside through the experiment. Garnet concrete was appeared that was superior to sulfate resist performance by the increasing of garnet. Case of the W/B 30%. garnet concrete did not get up the diminution of weight to follow that small mixing ratio of S/A and expressed diminution of weight the increasing in ratio of S/A. Consequently. If we should make concrete as condition of optimum mixture. we will be expected the effect of sulfate resist performance.