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혈행화된 두개골 피판을 이용한 안와저 및 안와하연의 재건술 치험례
정윤규,이훈범,김석원,봉정표,김균태,김주봉 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.5
A number of methods have been introduced for support the orbital floor following a maxillectomy without orbital exenteration or severe facial trauma. These methods including skin graft and muscular sling provided the unsatisfactory results, like as diplopia, orbital ptosis, enophthalmos and severe facial deformity. Therefore the bone and soft tissue reconstructions using microvascular free flaps were performed recently by many surgeons, but long time operation, donor site morbidity, postoperative large scar, and ptosis of the flap were pointed out as disadvantages of free flap reconstruction. Vascularized calvarial bone flap, a modified method of free calvarial bone graft, was adequate for reconstruction of the orbital floor and the infraorbital rim as a horizontal buttress, especially in case of poor vascular bed and postradiated state. The authors introduced the vascularized calvarial bone flap for the orbital floor and the infraorbital rim reconstruction in 3 cases of maxillectomy, and could be obtained satisfactory results aesthetically and functionally.
유영수,이황규,홍석원 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
Recently network restoration is emerged as a major issue as the network link capacity is increasing tremendously especially in the optical network. Major problem in the network restoration is how to setup the restoration path or backup path which can guarantee the bandwidth assigned to a working path, consequently resulting in the QoS routing issues. In this paper we introduce an algorithm to establish a working path and its backup path which guarantee the bandwidth of a working path, at the same time reducing the bandwidth consumption by sharing the bandwidth of backup paths unless its corresponding working path through the same link. And we show results about bandwidth consumption of the algorithm by simulation.
두겹의 실리콘 판을 이용한 새로운 도서형 피막피판에 대한 연구
홍준표,정윤규,김석원,이훈범 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.4
The search for a new flap with minimal donor morbidity has been pursued by many plastic surgeons. Numerous donor sites available for microsurgical composite tissue transplantation have been described owing to the tremendous advances made in the field of microsurgery. To be suifable for use as a free flap, a sizable vessel must be included within the tissue, leading to significant donor morbidity. There have been studies for prefabrication of an axial pattern flap in an effort to create a new flap, but most of these methods relied solely on revascularization of a preexisting composite tissue. Our experiment, using an isolated femoral artery and vein as the main pedicle, led to formation of a capsule flap through a normal foreign body reaction between 2 silastic sheet implants. On this induced capsule flap, a skin graft was performed and a total of 40 axial pattern capsulo-cutaneous flaps from 20 Sprague-Dawley rats were successfully obtained after nearly 12 weeks through 4 stages of experiment, including a delay procedure at the second stage. Pathology revealed neovascularization, and abundantly impregnated vascular structures near the pedicle were observed along with random pattern collagen fibers. The skin graft took 100% on this newlyformed axial pattern capsular flap and thus implied that the capsule structure was able to survive on it`s own and was able to support skin grafts. This new flap using only the isolated artery and vein structure can be induced according to various needs with minimal donor morbidity.
봉정표,정윤규,이훈범,김주봉,이재화,나동균,김석원 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.6
Hypopharyngo-esophageal cancer is usually found at late stage. Its main treatment is surgical intervention and it often requires radical resection. Reconstruction of the hypopharyngo-esophageal defect after the resection of carcinomas of the hypopharynx and the cervical esophagus has traditionally been carried out with deltopectoral or musculocutaneous flap. Another approach is to reconstruct the defect with the colon or stomach. Recent advances in microvascular surgical techniques have resulted in one stage reconstruction with free flap. Both jejunal free flap and radial forearm free flap is a good alternative for the reconstruction of hypopharyngo-esophageal defect. Six cases of the radial forearm flap and nine cases of the jejunal flap were used to reconstructed the hypopharyngo-esophageal defect in 15 patients. In jejunal free flap, upper margin was reconstructed with end to side anastomosis and lower margin with end to end anastomosis. In radial forearm free flap, we used trapezoid shaped flap and tubed by complete or partial tubing according to the condition of the defects. Stricture and fistula are troublesome complications. The complications were peritonitis(n=1) and fistula(n=1). We concluded that both forearm and jejunal free flap is a useful alternative in reconstruction of hypopharynx and cervical esophagus.
Structures and N→Si Bond Characters of 1-Fluorosilatrane and the Silatranyl Cation
Lee, Hyo-Sug,Bae, Cheol-Beom,Do, Young-Kyu,Lee, Yoon-Sup Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.2
The structures of 1-fluorosilatrane and the silatranyl cation were calculated by Hartree-Fock (HF), Mofller-Plesset second order (MP2), and various density functional theory (DFT) methods using many different basis sets, demonstrating that the Si-N bonds in two species are quite different. The N${\rightarrow}$Si bond distance of 1-fluorosilatrane from the hybrid DFT calculations $({\sim}2.32{\AA})$ using the Perdew-Wang correlation functional agrees with the gas phase experimental value $(2.324{\AA})$, while other functionals yield larger distances. The MP2 bond distance (2.287${\AA}$ with 6-311$G^{\ast}$) is shorter, and the HF one (2.544 ${\AA}$ with 6-311$G^{\ast}$) larger than those of DFT calculations. The MP2 bond distance is in good agreement with experiment indicating that the electron correlations are crucial for the correct description of the N${\rightarrow}$Si interaction. The silatranyl cation is a stable local minimum on the potential energy surface in all methods employed suggesting that the cation could be a reaction intermediate. The Si-N bond length for the cation is about 1.87 ${\AA}$ for all calculations tested implying that the Si-N bond is mainly conventional. Bonding characteristics of the Si-N bond in two species derived from the natural bond orbital analysis support the above argument based on calculated bond lengths.
초등학교 어린이의 성별 및 비만도 수준에 따른 식생활인지·실천수준의 비교
이정숙(Lee Jung-Sug),김혜영(Kim Hye-Young),최영선(Choi Young-Sun),곽동경(Kwak,Tong-Kyung),정해랑(chung Hae Rang),권세혁(Kwon Sehyug),최윤주(Choi Youn-Ju),이순규(Lee Soon-Kyu),강명희(Kang Myung-Hee) 韓國營養學會 2011 Journal of Nutrition and Health Vol.44 No.6
This study was performed to analyze children's perceptions and practice levels according to gender and obesity status using a dietary life safety index. A national survey was conducted on fifth grade children (n = 2,400), who were selected using three-stage stratified cluster sampling from 16 provinces. The average height was 144.8 cm, and weight was 38.8 kg. The average body mass index was 18.4 kg/m2 and underweight, overweight, and obese children were identified using the 2009 KHNANES cutoff values, which were 5.3%, 10%, and 5.9%, respectively. The perception and practice scores for hand-washing prior to eating were high and the score for willing to buy at a clean store was also high. However, students answered that the hygiene level of food stores near the school was poor. More students skipped breakfast than lunch or dinner. The frequency scores for fruit and vegetables were significantly higher for girls than those for boys. Students had a good understanding of nutrition labeling but did not frequently check the label. Seventy-five percent of the students tried to avoid high calorie foods with low nutritional value, but only 40% had the appropriate knowledge about high calorie foods with low nutritional value. Girls had better dietary life perception and practice levels than those of boys. No differences in perception or practice levels were observed based on obesity status. Nutrition education on the importance of eating breakfast and having accurate knowledge on nutrition labeling and high calorie foods with low nutritional value is needed. Behavior-centered education should be implemented to improve the perceptions and practice level of student's dietary life. (Korean J Nutr 2011; 44(6): 527~536)
Kim, Sang Yong,Kim, Yesel,Lee, Kyung Moon,Yoon, Woo Sug,Lee, Ho Seok,Lee, Jong Tae,Kim, Seung-Joo,Ahn, Yeong Hwan,Park, Ji-Yong,Lee, Tai Kyu,Lee, Soonil American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16
<P>We report fully solution-processed fabrication of transparent conducting oxide-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) by combining spray-coating of single-wall carbon nanotubes (SWCNTs) and chemical reduction of chloroplatinic acid precursor to platinum nanoparticles (Pt NPs) with formic acid. The power conversion efficiency of a semitransparent DSSC with such SWCNT-based CE loaded with Pt NPs is comparable to that of a control device with a conventional CE. Quantification of Pt loading shows that network morphology of entangled SWCNTs is efficient in forming and retaining chemically reduced Pt NPs. Moreover, electron microscopy and electrochemical impedance spectroscopy results show that mainly Pt NPs, which are tens of nanometers in diameter and reside at the surface of SWCNT CEs, contribute to electrocatalytic activity for triiodide reduction, to which we attribute strong correlation between power conversion efficiency of DSSCs and time constant deduced from equivalent-circuit analysis of impedance spectra.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-16/am5019447/production/images/medium/am-2014-019447_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5019447'>ACS Electronic Supporting Info</A></P>