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A Study on Hair Removal Characteristics Using a Long-pulsed Alexandrite Laser
Choi Jin-Young,Kim Sang-Gil,Park Jong-Woong,Park Sung-Joon,Kim Hee-Je The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrophysics Vol.5C No.1
Recently, lasers have become widely used throughout the medical treatment field. Several types of lasers have been used for the purpose of hair removal since the Alexandrite laser was approved by the FDA (Food & Drug Administration) for clinical epilation. In this study, a long-pulsed Alexandrite laser system for hair removal adopting a multi-discharge method in which three flash lamps are turned on consecutively was designed and fabricated. This laser system shows the technology that makes it possible to create extended pulse by turning on three flash lamps consecutively. With this technique, the pulse width can be varied from 4ms∼10ms. Then using this Alexandrite laser system with the pulse width 10ms and the beam size 7mm, hair removal was performed on the back portion of a human hand and leg. This study shows that treatment by the long-pulsed Alexandrite laser produces hair removal with no relevant side effects.
Gil-Chun Park,Shin Hwang,Dong-Hwan Jung,Tae-Yong Ha,Gi-Won Song,Chul-Soo Ahn,Deok-Bog Moon,Ki-Hun Kim,Young-In Yoon,Hwui-Dong Cho,Jin-Uk Choi,Sung-Gyu Lee 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.99 No.5
Purpose: A cryopreserved iliac artery homograft (IAH) has not been considered suitable for middle hepatic vein (MHV) reconstruction during living donor liver transplantation (LDLT), primarily due to the low patency from its small diameter. We revised our surgical techniques for MHV reconstruction using an IAH to improve its patency. Methods: This study analyzed the causes of early conduit occlusion and developed revised techniques to address this that had clinical application. Results: The potential risk factors for early conduit occlusion were the small IAH size, small graft in the segment V vein (V5) and segment VIII vein (V8) opening, and small recipient MHV-left hepatic vein stump. These factors were reflected to our revised surgical methods which included endarterectomy of the atherosclerotic plaque, unification of the internal and external iliac artery branches for large V5, and branch-patch arterioplasty for large V8. IAH endarterectomy, branch unification technique, and branch-patch arterioplasty were applied to 8, 5, and 5 patients, respectively and resulted in 1-month occlusion rates of 37.5%, 20.0%, and 40.0%, respectively. The overall patency rates of the IAH-MHV conduits in our 18 patients were 66.7% at 1 month, 38.9% at 3 months, and 33.3% at 1 year. Conclusion: Our refined MHV reconstruction using an IAH improved short-term MHV conduit patency, but did not effectively prevent early conduit occlusion, particularly with a small- or medium-sized IAH. Individualized reconstruction designs during LDLT operation are needed when an IAH is used for a modified right liver graft.
Sang-Hee Lee(Sang-Hee Lee),Kyu-Ho Yi(Kyu-Ho Yi),Jung-Hee Bae(Jung-Hee Bae),You-Jin Choi(You-Jin Choi),Young-Chun Gil(Young-Chun Gil),Kyung-Seok Hu(Kyung-Seok Hu),Eqram Rahman(Eqram Rahman ),Hee-Jin Ki 대한해부학회 2024 Anatomy & Cell Biology Vol.57 No.1
The aim of this study was to identify the anatomical feature of retaining ligament and fat compartment on the lower eyelid and infraorbital region using a histological method, and to investigate clear definitions for them which could be used generally in the clinical area. Eighteen specimens from eight fresh Korean cadavers were stained with Masson trichrome or hematoxylin and eosin. The ligamentous and fascial fibrous tissue were clearly identified. The ligamentous fibrous tissue which traversed in the superficial and deep fat layer was skin ligament and orbicularis retaining ligament (ORL). The fascial fibrous tissue enclosed the orbicularis oculi muscle (OOc) and circumferencial adipose tissue. Based on the ligamentous and fascial structure, three fat compartments, septal, suborbicularis oculi and infraorbital fat compartment, could be identified. The OOc attached to orbital rim and dermis by ORL and skin ligament, and the muscle fascicle and fat fascicle provided the connection point to the ORL and skin ligament as enclosing all muscle and fat tissue. The combination of the force made by the skin ligament in the lower eyelid and ORL may decide the level and form of the infraorbital grooves.
Choi, Hyunmo,Jeong, Suyeong,Kim, Dong Su,Na, Hyung Jin,Ryu, Jong Sang,Lee, Seung Sik,Nam, Hong Gil,Lim, Pyung Ok,Woo, Hye Ryun Blackwell Publishing Ltd 2014 Physiologia plantarum Vol.150 No.2
<P>Phytochromes are red (R)/far-red (FR) photoreceptors that are central to the regulation of plant growth and development. Although it is well known that photoactivated phytochromes are translocated into the nucleus where they interact with a variety of nuclear proteins and ultimately regulate genome-wide transcription, the mechanisms by which these photoreceptors function are not completely understood. In an effort to enhance our understanding of phytochrome-mediated light signaling networks, we attempted to identify novel proteins interacting with phytochrome B (phyB). Using affinity purification in ArabidopsisphyB overexpressor, coupled with mass spectrometry analysis, 16 proteins that interact with phyB in vivo were identified. Interactions between phyB and six putative phyB-interacting proteins were confirmed by bimolecular fluorescence complementation (BiFC) analysis. Involvement of these proteins in phyB-mediated signaling pathways was also revealed by physiological analysis of the mutants defective in each phyB-interacting protein. We further characterized the athb23 mutant impaired in the homeobox protein 23 (ATHB23) gene. The athb23 mutant displayed altered hypocotyl growth under R light, as well as defects in phyB-dependent seed germination and phyB-mediated cotyledon expansion. Taken together, these results suggest that the ATHB23 transcription factor is a novel component of the phyB-mediated R light signaling pathway.</P>
Diode Embedded AlGaN/GaN Heterojuction Field-Effect Transistor
Sung-Hoon Park,Jae-Gil Lee,Chun-Hyung Cho,Yearn-Ik Choi,Hyungtak Kim,Ho-Young Cha 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.2
Monolithically integrated devices are strongly desired in next generation power ICs to reduce the chip size and improve the efficiency and frequency response. Three examples of the embedment of different functional diode(s) into AlGaN/GaN heterojunction field-effect transistors are presented, which can minimize the parasitic effects caused by interconnection between devices.
RSSI Based Path Finding of Mobile Robot in Sensor Network
Sung Gil Wee,Jung Won Choi,Suk Gyu Lee,Ju Hyun Park 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
We propose a new path finding approach for a mobile robot using the RF strength in a sensor network. In experiments based on the proposed method, a mobile robot finds its location, heading direction, and the shortest path under an indoor environment. The mobile robot is equipped with a base station to receive data from the environment around each node. When the robot moves from one point to another, it checks the strength of the received signal to find its path and uses a Kalman filter to reduce the error of the tangent. The experimental results show the effectiveness and applicability of the proposed method in path finding of a mobile robot.
Choi, Jae-Sung,Kwak, Kyung-A,Park, Min-Ju,Kim, Young-Hee,Gil, Hyo-Wook,Song, Ho-yeon,Hong, Sae-yong International Scientific Literature, Inc. 2013 Medical science monitor Vol.19 No.-
<P><B>Background</B></P><P>To determine whether initial reactive oxygen species (ROS)-induced endothelial cell injury is involved in early death after paraquat intoxication and concentrations of angiopoietin-1 (Ang-1), angiopoietin-2 (Ang-2), and von Willebrand factor (VWF) reflecting endothelial cell injury, we investigated the initial endothelial cell injury marker involved in the pathogenesis of death within 5 days after paraquat ingestion.</P><P><B>Material/Methods</B></P><P>Sixty patients with paraquat poisoning were prospectively enrolled. Plasma samples were collected at admission. Plasma concentrations of Ang-1, Ang-2, and VWF were measured by enzyme-linked immunosorbent assay. The patients were classified into 3 categories: survivors, early death (died within 5 days after ingestion), and late death (died more than 5 days after ingestion).</P><P><B>Results</B></P><P>The baseline concentration of Ang-2 and the Ang-2: Ang-1 ratio were significantly higher in patients who died (Ang-2 [pg/mL], 1012.75±468.02 <I>vs.</I> 1986.07±1675.37 [p=0.002]; Ang-2: Ang-1, 0.90±0.49 <I>vs.</I> 2.16±2.28 [p=0.002]). The Ang-2: Ang-1 ratio was significantly higher in the early death group (2.41±2.54) than in the survivors (0.90±0.49) and the late death group (1.33±0.64). The Ang-2: Ang-1 ratio was significantly associated with early death (OR, 2.602; 95% CI, 1.106–6.117; p=0.028) after adjusting for plasma levels of paraquat, age, PCO<SUB>2</SUB>, and creatinine. VWF did not predict mortality.</P><P><B>Conclusions</B></P><P>Endothelial cell damage could be involved in the pathogenesis of early death following paraquat ingestion.</P>