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송영국,정영완,진태호,Song, Young-Kuk,Jung, Young-Wan,Jin, Tai-Ho 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.2
The bond failure of resin teeth In denture base resin is one of the failure in prosthodontic treatment. The purpose of this study was to evaluate the bond strength of artificial resin teeth to the denture base resins. Specimens were made with heat curing acrylic resins (Vertex Rs, Lucitone 199) and artificial resin teeth (Tiger, Trubyte biotone, Endura, Orthosit, Tubyte bioform IPN) and the bond strength were measured with testing machine(Zwick. Germany) and the mode of bond failure were observed. The results were as follows; 1. The bond strength of Vertex Rs to artificial resin teeth was the highest in Tubyte biotone, and It was the lowest in Tiger and Trubyte bioform IPN. 2. The bond strength of Lucitone 199 to artificial resin teeth were higher in Orthosit and Trubyte bioform IPN than in Tiger and Trubyte biotone. 3. The bond strength of Trubyte biotone to Vertex Rs was higher than to Lucitone 199 and that of the Trubyte bioform IPN to Lucitone 199 was higher than to Vertex Rs. 4. Nearly all bond failures of specimens occured cohesively within the resin teeth.
반복 사용된 IPS Empress 2의 굽힘강도와 색변화에 관한 연구
송영국,김유리,김성훈,안희영,진태호,Song Young-Kuk,Kim Yu-Lee,Kim Sung-Hoon,Ahn Hee-Young,Jin Tai-Ho 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.1
Development of new ceramic and esthetic need of patient increased the use of ceramic restorations. The purpose of this study was to confirm the possibility of recycling for IPS Empress2 which has a lot of advantages in esthetics. 1st, 2nd and 3rd pressed disc-shaped($10{\times}1.5mm$) IPS Empress 2 specimens were made with IPS Empress ingot(shade 200, Ivoclar, Liechtenstein) and pressing furnace(IPS Empress EP 500, Ivoclar, Liechtenstein). Flexure strength was measured with universal testing machine(Zwick 145641, Zwick, Germany), and color change and staining resistance of specimens were evaluated with colorimeter (Model TC-6FX, Tokyo Denshoku Co., Japan). The followings were drawn from this study : 1. Flexure strength of the 1st, the 2nd, and the 3rd pressed specimens showed 236.78 MPa. 247.16MPa, and 220.72MPa, respectively. Flexure strength of the 2nd pressed specimens was higher than others, but there's no statistical difference between them. 2. The color difference between the 1st and the 2nd pressed specimens was 3.25, and that between the 1st and the 3rd pressed specimens was 3.63(P<0.05). 3. The color change after staining of the 1st, the 2nd. and the 3rd pressed specimens were 1.43, 2.64, and 1.45, respectively. In this study, reused IPS Empress 2 specimens showed insignificant change of flexure strength and stain resistance, but they showed some color change according to reuse. From this results, the limited possibility of reuse for IPS Empress 2 could be considered.
Polycaprolactone 파우더를 이용한 새로운 salt leaching 세포 지지체의 세포배양 특성평가
송영국(Young-Gook Song),김범수(Beom-Su Kim),유형근(Hyung-Keun You),조영삼(Young-Sam Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this study, we characterized the cell-culturing ability of salt-leached scaffolds using thermoplastic polymer powder. This method does not need immense pressure to make a certain porous structure using salt leaching technique. For the fabrication, we prepared thermoplastic PCL powder with size of several hundred micrometers. After that, we mixed polymer powder and salt with 10, 20, 30 wt%, respectively. Subsequently we put together on hotplate to melt thermoplastic polymer. We cool down melting specimen and soaking it into D. I. water to leach salt powder. We measured the porosity of fabricated structures and measured the compressive effective stiffness using UTM. Moreover, we tested the compressive characteristics via UTM test machine. Moreover, we assessed the cell-culturing characteristics with MG63 cell line.
반복 사용된 IPS Empress ceramic의 물리적 성질에 관한 연구 Part III. 염색저항성에 관한 연구
진태호,송영국,Jin, Tai-Ho,Song, Young-Kuk 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.6
The purpose of this study was to investigate the possibility on recycling of IPS Empress ceramic for the wide use of esthetically pleased IPS-Empress ceramic in clinical prosthodontic treatment. The specimens were made of first, second, and third pressed IPS Empress ceramic and were immersed in 0.05% methylene blue solution for 24hours. The amount of color change before and after stain-ning was measured with colorimeter(Model Tc-6Fx, Denshoku Co., Tokyo, Japan). The change of ${\Delta}E$ in first pressed ceramic was 18.33 and those in second and third pressed ceramics were 19.33 and 19.93 respectively. Although there was statistical difference among them, the differences were minute and acceptable. From the results of this study, the possibility of recycling of IPS Empress ceramic could be suggested.
기공률 경사 구조를 갖는 세포지지체 제작을 위한 와이어 네트워크 몰딩 기법
허창민(Chang Min Heo),송영국(Young Koog Song),이세환(Se Hwan Lee),김태영(Tae Young Kim),이승재(Seung-Jae Lee),조영삼(Young-Sam Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
We modified “wire-network molding” technique to fabricate a scaffold with porosity-gradient structure for potential application in bone tissue engineering. Wire-network molding technique uses a mold coupled with several wires having network. Grinded PCL (polycaprolactone) could be filled in the mold and heated to melt down for reconfiguration. After that, we should separate wires from the mold and remove the mold from PCL. Afterward, the remained PCL has an interconnected porosity with a configuration of wire-network, that is, the required design for cell-culturing scaffold. In this study, we modified the position of wire coupled with the mold to get the scaffold with porosity-gradient structure.
이세환(Se Hwan Lee),김태영(Tae Young Kim),허창민(Chang Min Heo),송영국(Young Koog Song),이승재(Seung-Jae Lee),조영삼(Young-Sam Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, we developed a novel technique to fabricate cell-culturing scaffold, that is, the wire-network molding. Several wires having network configuration are coupled with a mold and grinded PCL (Polycaprolactone) could be filled in the mold. Subsequently, we put the mold filled with grinded PCL in vacuum oven to melt down PCL. After that, we should separate wires from the mold and remove the mold from PCL. Afterward, the remained PCL has an interconnected porosity with a configuration of wire-network, that is, the required design for cell-culturing scaffold. The final configuration of manufactured scaffold is almost same as that using SFF (Sold Freeform Fabrication) technique. However, the novel technique called as “wire-network molding” could be more effective in mass production than SFF technique, because the process time of novel technique does not depend on the size of scaffold in contrast to SFF technique
스마트시티 데이터허브를 활용한 공조시스템용 에너지소비량 절감 알고리즘 개발
김성중(Sung Joong Kim),추연욱(Yeon Ouk Choo),송영국(Youngkook Song),윤용태(Yong-tae Yoon),김경훈(Kyoung-hoon Kim) 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.3
공기조화시스템은 건물 내 공기의 질을 이용자들의 활동에 쾌적하도록 유지해주는 기술 일체를 뜻한다. 대형 건축물의 중앙식 공조시스템은 미리 설계된 매뉴얼에 맞추어 단순하게 운영되기에, 건물에너지의 낭비를 초래하고, 실내 공기질 개선 등 이용자의 요구사항 반영에도 난점을 지닌다. 다양한 도시 데이터를 바탕으로 시민 삶의 질 향상을 목표로 하는 스마트시티와 데이터허브의 도입은 기존 공기조화시스템 개선의 동력이 될 수 있다. 본 논문은 페르소나 기법을 활용하여 테스트 건물인 서울대학교 시흥캠퍼스 교육협력동 이용자들의 니즈를 파악하고, 스마트시티 데이터허브의 데이터를 활용하는 공조시스템 실시간 운영 알고리즘을 제시한다. 알고리즘은 건물 내외 이산화탄소 농도, 미세먼지 농도, 온습도를 비교하여 공조시스템의 댐퍼 개도를 실시간으로 조절한다. 새로운 알고리즘은 공조시스템의 연간 에너지소비량을 기존 대비 32% 절감하고, 실내 미세먼지 및 이산화탄소 농도 또한 이용객의 쾌적 활동범위에서 유지한다. The HVAC system maintains the quality of air in the building to be comfortable for the inhabitants. As the HVAC system for large buildings has usually been operated manually, it has weaknesses in efficient use of energy and reflecting inhabitants’ needs such as air quality improvement. Development of smart city and data hubs, aimed at improving the quality of life of citizens based on various city data, can become a driving force in improving the conventional HVAC system. By using the persona technique, this paper identifies the needs of inhabitants of the test-bed building in Seoul National University and suggests algorithm that run the HVAC system in real-time using data collected through the smart city data hub. The algorithm is designed to adjust the damper position of the HVAC system real-time by comparing the levels of carbon dioxide, fine dust, and temperature and humidity inside and outside the building. Simulation results show that the new HVAC system saves 32% in annual energy consumption compared to the previous system and maintains the concentration of fine dust and carbon dioxide within the range of conditions that allow occupants to comfortably carry out activities.