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가청주파수 경계대역에서 저가의 통신채널을 제공하는 초음파 모뎀 구현
전성배,이동원,정해,Jeon, Seong-Bae,Lee, Dong-Won,Chung, Hae 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.6
최근 출시되고 있는 PAN 용 통신부품으로 Bluetooth와 Zigbee가 선호되고 있으나 가전제품을 비롯하여 오디오기기, 휴대폰, PC 등에서 비교적 저속으로 단순한 메시지를 전달하는데 있어서 이러한 통신부품을 장착하기에는 다소 부담스럽고 제품이 복잡해진다. 본 논문에서는 제품에 이미 장착되어 있는 스피커와 마이크를 이용하여 가청한계 대역에서 초음파를 이용한 무선 통신 방법을 제안한다. 오디오 신호에 영향을 주지 않고 데이터 전송을 가능하게 하기 위하여 가청 한계 대역에서 ASK와 FSK 송수신 방식을 제시하고, 초음파 통신 모뎀을 설계 및 구현한다. 구현된 통신 모뎀은 배경 잡음이 있는 환경에서 실험을 통해 제안한 초음파 통신 모뎀의 성능을 검증한다. Recently, communication components prefer Bluetooth or Zigbee for PAN. However, using these makes expensive and complicated products such as audio equipments, mobile phones, PC, etc. for transmitting simple messages with low rate. In this paper, we propose wireless communication method using ultrasonic in the audio frequency limit band with speakers and microphones which are in products. We suggest transmitting and receiving methods in the audio frequency limit band for transmitting data without affecting audio signal, and implement an ultrasonic communication modem. Finally, we verify the performance of the ultrasonic communication modem by experiments in an environment with background noise.
가토 두개골 결손부에 이식된 저골(猪骨)과 혈소판 풍부 섬유소의 골형성 효과
박정익,전성배,송영일,도형식,이진용,장현석,권종진,임재석,이의석,Park, Jeong Ik,Jeon, Seong Bae,Song, Young Il,Do, Hyung Sik,Lee, Jin Yong,Jang, Hyun Seok,Kwon, Jong Jin,Rim, Jae Suk,Lee, Eui Seok 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.6
Purpose: The purpose of this study was to evaluate the effectiveness of the platelet-rich fibrin (PRF) used in combination with the porcine cancellous bone as a scaffold, in promoting bone regeneration in the bone defects ofthe rabbit calvaria. Methods: Ten rabbits were used in the study. Three round-shaped defects (diameter 8.0 mm) were created in the rabbit calvaria and were filled with nothing (control group), porcine cancellousbone (Experimental Group 1, porcine bone) and PRF-mixed porcine cancellous bone (Experimental Group 2). TS-GBB is a xenogenic bone-substitute product comprised of a high heat-treated mineralized porcine cancellous bone. Animals were sacrificed at 6 weeks and 12 weeks for the histological and radiographic evaluations. Results: In the micro computed tomography and histological results, the experimental groups 1 and 2 showed more bone formation, remodeling, and calcification than the control group. The new bone formation ratio showed theGroup 2 to be larger than Group 1 at6 and 12 weeks. However, there was no significant difference between the experimental groups 1 and 2 in the new bone formation area, at the 6 and 12 weeks (P>0.05). Conclusion: The PRF-mixed group showed more bone formation than the porcine cancellousbonegroup (TS-GBB), butthere was a no significant difference. The PRF may not lead to enhanced bone healing when grafted with the porcine cancellous bone.
김원석,김영석,전성배,전상호,이의석,장현석,권종진,임재석,Kim, Won-Seok,Kim, Young-Seok,Jeon, Seong-Bae,Jun, Sang-Ho,Lee, Eui-Suk,Jang, Hyon-Seok,Kwon, Jong-Jin,Rim, Jae-Suk 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.2
Purpose: The purpose of this study was to evaluate the expression of osteogenic genes associated with bone regeneration on anodizing titanium surface. Methods: $20{\times}20{\times}1$ (mm) commercially pure titanium plate was made, one group was pure titanium, second group was punched, and last group was punched and anodized by electrochemical method. Through the osteogenic cell culture model, the expression of extracellular matrix proteins, such as bone morphogenetic protein-2, bone sialoprotein, aggrecan, osteocalcin, Alkaline phosphatase, collagen I had been evaluated by Real-time polymerase chain reaction, and the morphology of growing cells was evaluated by scanning electron microscopy. Results: The attachment of mesenchymal stem cell was even and well-oriented on all Ti surfaces. The osteogene expression was increased on punching groups but, decreased on anodizing surfaces in 3 week samples. Conclusion: Punched anodizing Ti has possibility be using as a dental implant material, but further in vivo study would be needed.