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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.
채유석,송갑득,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The simple solid electrolyte carbon dioxide sensor was fabricated using Li ionic conductor with a heater and Li_(2)CO_(3)+Na_(2)CO_(3)+K_(2)CO_(3) (47.6 : 25.4 : 27.0) as a metal carbonate auxiliary phase. The electromotive force(EMF) was in excellent agreement with the EMF value calculated from the Nernst' s equation for CO_(2) gas concentration from 950 to 9,950ppm at 420℃, with the response time of 15~25 sec.. Water vapor hardly affected the sensor characteristics for relative humidity from 40% to 90%, in contrast to the case of the Li_(2)CO_(3) and Na_(2)CO_(3) + BaCO_(3)(1 : 1.7). The CO_(2) sensitivity of this sensor was stable for the test period of 240 hours.
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.
Influence of Local Coercivity Variation on Magnetization Reversal Dynamics
Sug-Bong Choe,Hyuk-Jae Jang,Sung-Chul Shin 한국자기학회 2000 Journal of Magnetics Vol.5 No.1
Local coercivity variation of Co/Pd nanomultilayers has been investigated by measuring the polar Kerr hysteresis loops of local areas of submicron size using a magnetooptic Kerr microscope system. Interestingly, the local coercivity distribution is very sensitive to an increase in the number of repeats: the (2-Å Co/11-Å Pd)_(10) sample showed a smooth variation of the local coercivity, while (2-Å Co/11-Å Pd)_(18) showed a large fluctuation. From micromagnetic considerations based on a thermally activated relaxation model, we have found that this local coercivity variation has a crucial effect on the contrasting magnetization reversal behavior observed in those samples: dominant wall-motion for the former sample and dominant nucleation for the latter one.
Measurement of Activation Magnetic Moment in Ferromagnetic Thin Films
Sug-Bong Choe,Sung-Chul Shin 한국자기학회 2001 Journal of Magnetics Vol.6 No.2
We have investigated the activation magnetic moment, which characterizes the basic magnetic moment acting as a single magnetic particle during magnetization reversal. The activation magnetic moment was measured from each local area on continuous ferromagnetic thin films, by analyzing the magnetic field dependence of magnetization reversal of the corresponding local area, based on a thermally activated relaxation process. It was found that the activation magnetic moment was nonuniform on a submicrometer scale; the fluctuation increased with increasing the number of layers in Co/Pd multilayers. The distribution could be well described by exp(δm^(3/2)), where δm is the deviation of the activation magnetic moment from the mean value.
Interfacial Dzyaloshinskii-Moriya Interaction in Ferromagnetic Thin Films
Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Interfacial phenomena play decisive roles in modern science and technology as the scale shrinks down to a few atomic layers. Such minute nanostructures require more comprehensive understanding beyond the conventional concepts of interfaces and interfacial phenomena generated at interfaces. The Dzyaloshinskii–Moriya interaction (DMI) generates intriguing chiral magnetic objects such as magnetic skyrmions and chiral domain walls that can be used as building blocks in emerging magnetic nanodevices. Precise control of the DMI strength is one of the key issues to achieve better stability and functionality of these chiral objects. Here we present two major experimental results on the interfacial DMI and spin-orbit torque (SOT) in ferromagnetic films. First, we report an experimental observation that in magnetic trilayer films, the DMI strength exhibits a noticeable correlation with the work functions of the nonmagnetic layers interfaced to the magnetic layer. Such correlation with the intrinsic material parameters provides a guideline for material selection to engineer the DMI strength. Second, from series of a-few-atomic-layer-thick magnetic films, here we demonstrate experimentally that, contrary to the common notion, interfacial phenomena require finite thickness for their full emergence. The layer thickness dependences revealed that the interfacial DMI begins to appear with thickness and emerges completely in the thickness of 2 to 3 atomic layers, at which the magnitude is maximized. This implies that the DMI is suppressed, when the “bulk” layer adjacent to interfaces is thinner than the threshold thickness. The existence of the threshold thickness indicates the need to refine conventional perspectives on interfacial phenomena and imposes the lowest structural bound and optimum thickness to maximize interfacial effects for technological applications.
Activation Volumes of Wall - Motion and Nucleation Processes in Co / Pd Multilayers
Sug-Bong Choe,Sung-Chul Shin 한국자기학회 2000 Journal of Magnetics Vol.5 No.2
The correlation between the activation volumes of wall-motion and nucleation processes in Co/Pd multilayers has been investigated. Each activation volume was estimated from the field dependence of the wall-motion speed and the nucleation rate, respectively, based on time-resolved domain patterns grabbed by a MOKE microscope system. Both the activation volumes are changed in the same manner around 0.2~1.1 × 10^(-17) ㎤ with changes in the multilayered structure. Interestingly, the correlation between the activation volumes is sensitive to the multilayered structure; the wall-motion activation volume is smaller than the nucleation activation volume for a sample having a smaller number of repeats and a thinner Co-layer thickness, and vice versa. The correlation is closely related with the contrasting reversal modes; the process having the smaller activation volume dominates.