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류석태,임소영,문구현 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.5
Purpose: Craniosynostosis of three or more cranial sutures was not common. "Mercedes Benz pattern,"named by Moore1 was a rare form of craniosynostosis and had an atypical pattern of premature closure of cranial suture. It was not reported in Republic of Korea. We report this case with literature review. Methods: A 13-months-old male patient visited our clinic due to exophthalmos. He showed normal developmental course. Other neurological tests were normal but he was Crouzon syndrome patient. CT scans showed bilateral lambdoid and posterior sagittal sutures were fused and the length of the skull was extended. Cranioplasty with pi craniotomy & Barrel-Stave osteotomy and recombination of the bone flap was performed. Results: The patient was discharged after post operative 10 days without any complications. In follow up visit after 2.7 years, he was in good state without recurrence and functional abnormality of skull. Conclusion: This was the first case of Mercedes Benz pattern craniosynostosis with Crouzon syndrome in Korea. This type of craniosynostosis has to be considered differently from single type of craniosynostosis or typical syndromic craniosynostosis clinically and surgically.
흉벽 재건에서 합성 물질의 피복을 위한 부분 근피판 조합의 효용성
류석태,변재경,임소영,문구현,방사익,오갑성 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.3
Purpose: Reconstruction of chest wall has always been a challenging problem. Muscle flaps for chest wall reconstruction have been helpful in controling infection, filling dead space and covering the prosthetic material in this challenge. However, when we use muscle flaps, functional and cosmetic donor site morbidities could occur. The authors applied and revised various partial muscle flaps and combination use of them to cover the prosthetic material for the chest wall reconstruction and evaluated the usefulness of partial muscle flaps. Methods: This study included 7 patients who underwent chest wall reconstruction using partial muscle flap to cover prosthetic material from 2004 to 2008. The pectoralis major muscle was used in anterior 2/3 parts of it leaving lateral 1/3 parts of it. The anterior 2/3 parts of the pectoralis major muscle were used while lateral 1/3 parts were left. In case of the rectus abdominis muscle flap, we used upper half of it, or we dissected it around its origin and then advanced to cover the site. The latissimus dorsi muscle flap was elevated with lateral portion of it along the descending branch of the thoracodorsal artery. If single partial muscle flap could not cover whole prosthetic material, it would be covered with combination of various partial muscle flaps adjacent to the coverage site. Results: Flap coverage of the prosthetic material and chest wall reconstructions were successfully done. There occurred no immediate and delayed post operative complications such as surgical site infection, seroma,deformity of donor site and functional impairment. Conclusion: When we use the muscle flaps to cover prosthetic material for chest wall reconstruction, use of the partial muscle flaps could be a good way to reduce donor site morbidity. Combination of multiple partial flaps could be a valuable and good alternative way to overcome the disadvantages of partial muscle flaps such as limitation of volume and size as well as flap mobility.
류석태,변재경,임소영,문구현,방사익,오갑성,Ryoo, Suk-Tae,Pyon, Jai-Kyong,Lim, So-Young,Mun, Goo-Hyun,Bang, Sa-Ik,Oh, Kap-Sung Korean Society of Plastic and Reconstructive Surge 2011 Archives of Plastic Surgery Vol.38 No.3
Purpose: Reconstruction of chest wall has always been a challenging problem. Muscle flaps for chest wall reconstruction have been helpful in controling infection, filling dead space and covering the prosthetic material in this challenge. However, when we use muscle flaps, functional and cosmetic donor site morbidities could occur. The authors applied and revised various partial muscle flaps and combination use of them to cover the prosthetic material for the chest wall reconstruction and evaluated the usefulness of partial muscle flaps. Methods: This study included 7 patients who underwent chest wall reconstruction using partial muscle flap to cover prosthetic material from 2004 to 2008. The pectoralis major muscle was used in anterior 2/3 parts of it leaving lateral 1/3 parts of it. The anterior 2/3 parts of the pectoralis major muscle were used while lateral 1/3 parts were left. In case of the rectus abdominis muscle flap, we used upper half of it, or we dissected it around its origin and then advanced to cover the site. The latissimus dorsi muscle flap was elevated with lateral portion of it along the descending branch of the thoracodorsal artery. If single partial muscle flap could not cover whole prosthetic material, it would be covered with combination of various partial muscle flaps adjacent to the coverage site. Results: Flap coverage of the prosthetic material and chest wall reconstructions were successfully done. There occurred no immediate and delayed post operative complications such as surgical site infection, seroma, deformity of donor site and functional impairment. Conclusion: When we use the muscle flaps to cover prosthetic material for chest wall reconstruction, use of the partial muscle flaps could be a good way to reduce donor site morbidity. Combination of multiple partial flaps could be a valuable and good alternative way to overcome the disadvantages of partial muscle flaps such as limitation of volume and size as well as flap mobility.
저온소결 PMN-PNN-PZT 세라믹스의 WO<sub>3</sub> 첨가에 따른 압전 및 유전특성
류주현,김국진,이석태,Yoo, Ju-Hyun,Kim, Kook-Jin,Lee, Seok-Tae 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.2
In this study, in order to. develop the low temperature sintering ceramics for multilayer piezoelectric actuator, PMN-PNN-PZT ceramics using CuO, $Bi_{2}O_{3}\;and\;Li_{2}CO_{3}$ as sintering aids were manufactured with the amount of $WO_{3}$ addition. The ceramics were sintered at $900,\;930,\;960^{\circ}C$, respectively. Thereafter, their microstructural, dielectric and piezoelectric properties were investigated. The $WO_{3}$ was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and $WO_{3}$ liquid phase. At 0.3 wt% $WO_{3}$ added specimen sintered at $930^{\circ}C$, electromechanical coupling factor($k_{p}$), mechanical quality factor($Q_{m}$), dielectric constant and $d_{33}$ showed the optimum values as the values of 0.60, 1,402, 1,440 and 360 pC/N, respectively, for multilayer piezoelectric actuator application.
PbO량에 따른 저온소결 PMN-PNN-PZT 세라믹스의 유전 및 압전특성
류주현,이석태,김도형,이상호,김국진,Yoo, Ju-Hyun,Lee, Seok-Tae,Kim, Do-Hyung,Lee, Sang-Ho,Kim, Kook-Jin 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.1
In this study, in order to develop multilayer ceramics vibrator for ultrasonic nozzle, PMN-PNN-PZT ceramics were fabricated using $Li_{2}CO_{3}-Na_{2}_CO_{3}$ as sintering aids and their piezoelectric and dielectric characteristics were investigated according to the amount of PbO. With increasing PbO contents, secondary phases were increased and phase structure was changed from tetragonal structure to rhombohedral structure and also electromechanical coupling factor was linearly decreased. At the composition ceramics with the sintering temperature of $870^{\circ}C$ and 1 mol% excess PbO, density, electromechanical coupling factor, dielectric constant, piezoelectric d constant and mechanical quality factor showed the optimum value of $7.879\;g/cm^{3}$, 0.55, 1149, 328 pC/N, 1224, respectively for multilayer ceramics vibrator application for ultrasonic nozzle.
류서현,박준영,김석태,이재경,고병성,우정욱 대한전기학회 2022 전기학회논문지 Vol.71 No.7
In this paper, we proposed a Beyond Visual Line Of Sight(BVLOS) drone system for inspection of transmission lines. As drone technology advances, drones are replacing dangerous tasks in the electric power industry. According to this trend, Korea Electric Power Corporation has developed the automatic inspection drone system for transmission lines. This system targeted inspection of transmission lines in the visible area. Since the transmission line is mainly located in mountainous area, the drone frequently enter the invisible area. In order to inspect multiple transmission lines with the existing system, frequent movement for drone takeoff and a lot of preparation time are required. To overcome this problem, we upgraded the existing system to inspect BVLOS transmission lines. For BVLOS flight, laws and regulations must be observed. Therefore, essential functions were derived from laws and regulations, and these functions were developed to be suitable for inspection of transmission lines. Finally, our system was verified through special flight approval from the Ministry of Land, Infrastructure and Transport. Through the new transmission line inspection drone system, the multiple transmission lines can be efficiently inspected at once.
물리공간과 관념공간의 경계: 디지털공간디자인의 문화-철학적 함의
류지석,김석태 한국기초조형학회 2004 기초조형학연구 Vol.5 No.3
The rise of new paradigm of digital culture requires the consideration of new Weltanschauung. Cyberspace is one of the key concepts for a full understanding of digital culture. This paper aim to examine the characteristics of digital space with historical approach in order to show its relation with architecture and design. We will study the problem of cyberspace retracing the philosophical and scientific notion of space and it's cultural implications. The development of digital techno-culture based on cyberspace and virtual reality is accompanied with the post-modern interpretation of civilization. For this reason not only the technical aspects of digital civilization but also the ontological reflection is essential to grasp the significance of cyberspace.