광고에 대한 이야기에 관한 연구

김의성,최난희,이준 한국광고홍보학회 1999 광고연구 Vol.0 No.43

만곡된 근관 성형시 스테인레스 강 파일과 니켈 티타늄 파일의 anticurvature filing 영향

김의성,김현정,서덕규,노병덕 大韓齒科保存學會 2009 Restorative Dentistry & Endodontics Vol.34 No.3

본 실험은 발거 된 하악 대구치의 근심 근관을 스테인레스 강 K 파일과 니켈 티타늄 전동식 파일로 근관 성형했을 때 anticurvature filing 방법의 효용성을 평가하고자 했다. 30개의 발거된 하악 대구치 60개의 근심근관을 성형 방법과 기구에 따라 3개의 군으로 나누고 근단부 근관을 30번 크기로 일정하게 확대하였다. 1군은 스테인레스 강 K 파일을 사용해 circumferential filing technique을, 2군은 스테인레스 강 K 파일을 사용해 anticurvature filing technique을 3군은 니켈 티타늄 ProFile 06 series를 사용해 anticurvature filing technique으로 근관을 성형하였다. MCT를 이용해 얻은 술전, 술후 절단면 상을 중첩해 치근단 공에서 1mm 떨어진 지점에서부터 0.5mm 간격으로 위험부위 (danger zone)의 삭제량을 비교하였다. micro-computed tomography system (skyscan-1076, SKYSCAN, Antwerpen, Belgium)을 이용해 얻은 술전, 술후 절단면 상을 중첩해 치근단 공에서 1mm 떨어진 지점에서부터 0.5mm 간격으로 위험부위 (danger zone)의 삭제량을 비교하였다. danger zone 폭경의 변화량은 one-way ANOVA를 이용하여 유의성 검정을 하였고 Tukey test를 이용하여 사후검정하였다. 그 결과, 스테인레스 강 파일을 사용한 경우 circumferential filing으로 근관 성형한 것보다, anticurvature filing으로 근관 성형한 경우가 치관부 1/3부위 (7.5~8.5mm)의 danger zone의 삭제량이 유의성 있게 적었고 (P<0.05), 니켈 티타늄을 사용하여 anticurvature filing으로 근관 성형한 경우는 danger zone의 중간 1/3부위 (3.5~6mm)의 삭제량이 유의성 있게 적었다 (P<0.05). 니켈티타늄을 사용하여 anticurvature filing으로 근관 성형한 경우, 스테인레스 강 파일을 사용하여 anticurvature filing으로 근관 성형한 경우보다 3.5~6mm의 삭제량이 유의성 있게 적었다 (P<0.05). The aim of this study was to compare the effects of anticurvature filing with stainless steel k-file versus nickel-titanium ProFile in the shaping of mesial root canals of extracted mandibular molars. A total of 60 canals from 30 mesial roots of mandibular molar teeth were randomly assigned to three groups with n=20 each. They were prepared with different instruments and methods: The first group with stainless steel k-file and circumferential filing, the second with precurved stainless steel k-file and anticurvature filing and the third with ProFile (.06 taper) and anticurvature filing. Using a micro-computed tomography system (skyscan-1076, SKYSCAN, Antwerpen, Belgium), pre-and post-operative specimens were scanned. Subsequently, canal images were superimposed and changes in root dentin thickness were measured at distal side (danger zone) of the canal. The data was analyzed using a one-way ANOVA and the comparison of means was conducted using a post hoc multiple comparison Tukey test. There were significant differences in the change of root dentin thickness at the 7.5~8.5 mm level between group 1 and 2, 3.5~6mm level between group 1 and 3 and 3.5~6mm level between group 2 and 3(n=20, P<0.05).

프리텐션 프리스트레스트 콘크리트 부재의 정착길이 평가

김의성,Kim, Ui-Seong 한국건설안전협회 2009 建設 安全技術 Vol.49 No.-

By bond mechanism between the prestressing strand and the concrete surrounding it, the effective force of prestressing must be transferred to the concrete entirely. The distance required to transfer the effective force of prestressing is called the transfer length, and the development length is the bond length required to anchor the strand as it resists external loads on the member. Transfer length was determined from the concrete strain profile at the level of the strands at transfer and development length was determined from various external loading lengths and compared with current code equation. Through the test results, bond failure is predicted based on the distress caused by cracks when they propagate within the transfer zone of prestressing strand. The current code equation was found to be conservative in comparison with the measured value.

Fluoxymesterone, $C_{20}H_{29}FO_3$의 결정구조

김의성,박권일,조성일,Kim, Ui-Seong,Park, Gwon-Il,Jo, Seong-Il 한국결정학회 1993 韓國結晶學會誌 Vol.4 No.1

11 β ,17 β -dihydroxy-9a-fluoro-l7a-methyl androst-4-en-3-one (Fluoxymesterone), CgoH29 FO,, orthorhombic, P2,2,2,, a=13.468(5) A, b= 19.554 (2)A, c=6.578(9)A, a=b=r=90˚, A (CuKa)=1.5406 A , Dm=1.289cm-3, Dc=1.299cm-3 and Z=4 at T=298k. The structure was solved by direct method using seminvariants of ggg Parity group and refined by the full-matrix least-square method, resulting model with reliability factor R=0.069 for 1098 unique reflection over 3σ . Ring A is an 1β-2a-half chair, 5 ring has a highly symmetrical chair conformation, C ring is in a distorted chair conformation and D ring is a 13aenveLope conformation. In the crystal structure, the molecules are packed with a hydrogen bond of 011-H23‥‥03(0.5+x, 1.5-y, 1.0-z) [1.94(9) A of H‥‥0.2.786(9)A of 0‥‥0 and 165(8) ˚ of <O-H 0] and van der Waals forces. 플루옥시메스테론, CtoHagF03, 정방정계, 공간군 P2l 2,2,, T=298k에서, a=13.468(5)A , b=19.554(2)A, c=6.578(9)A, a=b=r=90˚, A(Cu-Ka)=1.5406A, Dm의.289cm-3, Dc= 299cm-3,2 구조는 ggg Parity군에 속하는 반불변수를 사용하는 직접법으로 해석 하였으며, 완전행렬 최소자숭법으로 정밀화하여 3σ 이상인 1098개의 독특한 회절반점에 대하여 최종 신뢰도 인자 R=0.062인 분자모형을 구하였다. A고리는 1β-2a a-반 의자형, B묘고리는 대칭성이 좋은 의자형, C고리는 약간 찌그러진 의자형 이며, D고리는 13u-envelope 형 태이다. 결정구조에서, 분자들은 011-H2로·.0대0.5+ x,1.5-y,1.0-2) [H‥‥0의 1.94(9),40·.0의 2.786(9) A 및 LO-H‥‥0의 165(8) ˚ ] 의 수소결합과 van der Waals 힘으로 채워져 있다.

Dynamic modeling of an automotive 12-V lead-acid battery

김의성,신치범,정승면,김성태 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.-

주행조건에 따른 리튬이온 배터리의 동적 거동 모델링

김의성,신치범,한태영,박성용 한국에너지공학회 2012 한국에너지공학회 학술발표회 Vol.2012 No.4

리튬이온 전지의 동적거동 모델링

김의성,신치범,한태영,박성용 한국에너지공학회 2011 한국에너지공학회 학술발표회 Vol.2011 No.10

저 도통손실 특성을 갖는 향상된 영전압 부분 직렬 공진형 DC/DC 컨버터

김의성,이동윤,현동석 전력전자학회 2000 전력전자학회 논문지 Vol.5 No.4

This paper presents an improved ZVS partial series resonant DC/DC converter (PSRC) with low conduction losses, suitable for high power and high frequency applications. The proposed PSRC have advantages of zero-voltage-switching (ZVS) of main switches for entire load ranges low conduction losses of main switches by decreasing current stresses. Also the reduction of the effective duty cycle is not occurred during the resonant period of the main circuit because the auxiliary circuit of the proposed converter is placed out of the main power path. The auxiliary circuit is composed with passive components, which are an inductor, two capacitors, two diodes, and a saturable inductor. An improved ZVS PSRC has so much characteristics with respect to the overall system efficiency and to the reduction of current stresses. The operation principles of the proposed converter are explained in detail and the various simulated and experimental results show the validity of the proposed converter. 본 논문에서는 고전력, 고주파 응용에 적합한 저 도통손실 특성을 갖는 향상된 양전압 부분 직렬 공진행 DC/DC 컨버터를 제안한다. 제안된 컨버터는 많은 범위에서 주 스위치의 영전압 스위칭을 보장히며 주 스위치의 전류 스트레스 감소에 의해 저도통 손실 특성올 이룬다. 또한 제안된 컨버터의 보조회로는 주 전력 흐름과 분리되어 있어 주 회로의 공진 시간동안 유효 듀티비 감소는 발생하지 않는다. 보조 회로는 인덕터, 커피시터, 다이오드 그리고 과포화 리엑터의 수동 소자들만으로 구성 되어있다. 따라서 향상된 ZVS PSRC는 전체 시스템의 효율과 전류 스트레스 감소면 에서 개선된 특성을 지닌다. 제안한 컨버터의 동작 원리를 자세히 설명하고 그 타당성올 시뮬레이션과 실험을 통하여 검증하고자 한다.

Cardiovascular effect of epinephrine in endodontic microsurgery: a review

김의성,장영준 대한치과보존학회 2013 Restorative Dentistry & Endodontics Vol.38 No.4

Epinephrine is one of the most widely-used vasoconstrictors in dental treatment including endodontic microsurgery. However, the systemic safety of epinephrine has been in debate for many years because of its potential risk to cause cardiovascular complications. The purpose of this review was to assess the cardiovascular effect of epinephrine use in endodontic microsurgery. Endodontic microsurgery directly applies epinephrine into the bone cavity, and the amount is reported to be much larger than other dental surgeries. Moreover, when considering that systemic potency of intraosseous application is reported to be comparable to intravenous application, the systemic influence of epinephrine could be increased in endodontic microsurgery. Besides, pre-existing cardiovascular complications or drug interactions can enhance its systemic influence, resulting in increased susceptibility to cardiovascular complications. Although clinical studies have not reported significant complications for patients without severe systemic complications, many epinephrine-induced emergency cases are warning the cardiovascular risk related with pre-existing systemic disease or drug interactions. Epinephrine is a dose-sensitive drug, and its hypersensitivity reaction can be fatal to patients when it is related to cardiovascular complications. Therefore, clinicians should recognize the risk, and the usage of pre-operative patient evaluation, dose control and patient monitoring are required to ensure patient's safety during endodontic microsurgery.

금전장관 수복물을 통한 치수강 개방이 금전장관 수복물의 미세변연누출에 미치는 영향

김의성,정진호,김용근 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.4

The marginal integrity of the crown can be broken during endodontic access cavity preparation due to the vibration of burs. Therefore, the purpose of this study was to evaluate the effect of endodontic access cavity preparation on the marginal leakage of full veneer gold crowns. 24 intact molars were mounted in acrylic resin blocks and prepared for crowns by a restorative dentist and crowns were cast with gold alloy. 20 Crowns were cemented with glass ionomer cement and 2 crowns were not cemented for positive control. 200 thermo-cycles from 5℃ to 50℃ with a travel time of 20s were completed. Then samples were randomly divided into 2 experimental groups of 9 each. Endodontic access preparation and zinc-oxide eugenol temporary fillings were done in Group 1. Teeth in Group 2 were not treated. Samples were coated with 2 layers of nail varnish and were immersed in 1% methylene blue dye for 20 hrs. Endodontic access was prepared in 2 samples, which were coated with nail varnish on all surfaces for negative control. After washing in running water, gold crowns were cut with a #330 bur. Four buccolingual sections. 2 mm apart, were cut from the central section of each tooth and were examined and scored under the microscope for dye leakage. Score 1: leakage to the cervical 1/3 of the axial wall, Score 2: leakage to the middle 1/3 of the axial wall, Score 3: leakage to the coronal 1/3 of the axial wall, Score 4: leakage to the occlusal surface. The median value for Group 1 is 4 and for Group 2 is 2. The result of this study showed that samples in Group 1 leaked more than those in Group 2. This finding was significant(P<0.001).