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풍선 확장술로 치료한 담관결석과 동반된 총담관 막양구조
백성민 ( Sung Min Baek ),김동욱 ( Dong Uk Kim ),장선미 ( Sun Mi Jang ),송병구 ( Byeong Gu Song ),박종만 ( Jong Man Park ),이대성 ( Dae Sung Lee ),김중근 ( Joong Keun Kim ),황경림 ( Kyung Lim Hwang ) 대한췌장담도학회 2014 대한췌담도학회지 Vol.19 No.3
Bile duct web is very rare disease and it`s etiology is controversial. Some webs are occurred in the presence of chronic inflammation, frequently associated with bile duct stone, but others are thought to be congenital. Many patients with bile duct web are asymptomatic, but they sometimes present symptom of biliary obstruction and cholangitis. It can be diagnosed by endoscopic retrograde cholangiopancreatogram, typically appearing as thin and shelf like radiolucent ring. We report a case of the common bile duct web with bile duct stones diagnosed by Endoscopic retrograde cholangiopancreatography (ERCP) in a 65-year-old man. The patient was treated by balloon dilatation successfully.
Jang, Nam-Su,Ha, Sung-Hun,Kim, Kang-Hyun,Kim, Jong-Man Elsevier 2019 Progress in organic coatings Vol.130 No.-
<P><B>Abstract</B></P> <P>Superhydrophobic surfaces with mechanical compliance and optical visibility open up new possibilities in practical applications. This work presents a simple, fast, and cost-effective route to fabricate highly flexible and transparent superhydrophobic films with hierarchical surface morphology. Two-tiered polymeric surface structures are readily obtained by a one-step photopatterning approach in conjunction with a roughened sandpaper template. The hierarchical superhydrophobic polymer (HSP) films show excellent wetting properties (static contact angle of >172° and contact angle hysteresis of <3° after Teflon coating), high optical transmittance (> 84% at 550 nm), and enhanced resistance to water drop impact. In addition, the HSP films exhibit high resistance to repeated bending and pressing deformations (5000 cycles), while stably maintaining their superhydrophobicity. The practical utility of the HSP film is successfully demonstrated through self-cleaning, anti-fogging, and water-jet impact tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flexible, transparent hierarchical superhydrophobic polymer film is proposed. </LI> <LI> The film is fabricated by one-step photopatterning in a simple and low-cost manner. </LI> <LI> SCA of >172°, CAH of <3°, and T<SUB>550nm</SUB> of >84% are achieved, ensuring durability. </LI> <LI> The self-cleaning, anti-fogging, and water-repellent capabilities are demonstrated. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jang, Hannah,Kim, Sehwan,Lee, Jae Man,Oh, Yong-Seok,Park, Sang Myun,Kim, Sang Ryong Wolters Kluwer Health | Lippincott Williams Wilkin 2017 NEUROREPORT - Vol.28 No.5
<P>Although the main cause of degeneration of the nigrostriatal dopaminergic (DA) projection in Parkinson's disease (PD) is still controversial, many reports suggest that excessive inflammatory responses mediated by activated microglia can induce neurotoxicity in the nigrostriatal DA system in vivo. Montelukast, which plays an antiinflammatory role, is used to treat patients with asthma. In addition, recent studies have reported that its administration could reduce neuroinflammatory activities, showing beneficial effects against various neuropathological conditions. These results suggest that montelukast may be a useful drug to alleviate inflammatory responses in PD, even though there are no reports showing its beneficial effects against neurotoxicity in the nigrostriatal DA system. In the present study, our results showed that treatment with montelukast could protect DA neurons against 6-hydroxydopamine (6-OHDA)-induced neurotoxicity and its administration significantly attenuated the production of neurotoxic cytokines such as tumor necrosis factor-alpha (TNF alpha) and interleukin-1 beta (IL-1 beta) from activated microglia in the substantia nigra (SN) and striatum following 6-OHDA treatment. Therefore, we suggest that montelukast can be used as a potential inhibitor of microglial activation to protect DA neurons in the adult brain against PD. NeuroReport 28: 242-249 Copyright (C) 2017 Wolters Kluwer Health, Inc. All rights reserved.</P>
Design and Analysis of AlGaN/GaN MIS HEMTs with a Dual-metal-gate Structure
Jang, Young In,Lee, Sang Hyuk,Seo, Jae Hwa,Yoon, Young Jun,Kwon, Ra Hee,Cho, Min Su,Kim, Bo Gyeong,Yoo, Gwan Min,Lee, Jung-Hee,Kang, In Man The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.2
This paper analyzes the effect of a dual-metal-gate structure on the electrical characteristics of AlGaN/GaN metal-insulator-semiconductor high electron mobility transistors. These structures have two gate metals of different work function values (${\Phi}$), with the metal of higher ${\Phi}$ in the source-side gate, and the metal of lower ${\Phi}$ in the drain-side gate. As a result of the different ${\Phi}$ values of the gate metals in this structure, both the electric field and electron velocity in the channel become better distributed. For this reason, the transconductance, current collapse phenomenon, breakdown voltage, and radio frequency characteristics are improved. In this work, the devices were designed and analyzed using a 2D technology computer-aided design simulation tool.
Jang, Nam-Su,Ha, Sung-Hun,Jung, Soo-Ho,Kim, Soo Hyung,Lee, Hye Moon,Kim, Jong-Man Elsevier 2019 Sensors and actuators. A, Physical Vol.287 No.-
<P><B>Abstract</B></P> <P>Development of low-voltage driven multifunctional thermal igniters for nanoscale energetic materials (nEMs) is important for extending the application of nEMs to various thermal engineering fields. In this study, highly flexible heater chips capable of generating a sufficient amount of heat to ignite nEMs at a low voltage are demonstrated by incorporating a patterned aluminum-doped paper (AP) with polymeric substrates. A combination of automatic paper cutting and single-step ultraviolet polymer curing techniques helps in the fabrication of various designs of flexible AP heater chips in a simple and low-cost manner. Based on the AP heater chips, three models of flexible thermal igniters are designed to develop new functions such as selective ignition and sequential ignition in a single chip and successfully operated at low voltages. Two types of compact ignition systems are fabricated by fully integrating the arrayed AP igniters, circuit modules, and portable batteries in a three-dimensional printed single package and on a flexible circuit board. The systems are successfully demonstrated to ignite nEMs wirelessly and selectively with a smartphone.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aluminum-doped paper (AP)-based flexible heater chips are proposed. </LI> <LI> The AP heater chips are used as a low-voltage thermal igniter for nanoscale energetic materials (nEMs). </LI> <LI> Fully integrated compact systems with remote and selective ignition (RSI) capabilities for nEMs are developed. </LI> <LI> The RSI systems are demonstrated to ignite nEMs wirelessly and selectively with a smartphone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jang, Nam-Su,Ha, Sung-Hun,Kim, Kang-Hyun,Cho, Myung Hoon,Kim, Soo Hyung,Kim, Jong-Man Elsevier Science Inc 2017 Combustion and Flame Vol.182 No.-
<P><B>Abstract</B></P> <P>Ignition of nanoenergetic materials (nEMs) has great potential for various portable and disposable actuator applications due to the unique ability to release pressure in a controllable manner. The development of highly efficient low-power igniters is very important in this context. Here we present a focused-laser-assisted nEMs igniter that can be remotely operated at low power with a portable laser pointer. The proposed optical igniter is monolithically integrated with a polymeric lens and prepared by a very simple, fast, and reproducible single-step soft-lithographic replication process using polydimethylsiloxane (PDMS). The polymeric lens plays a crucial role in greatly enhancing the laser power density on a target area by efficiently concentrating the incident laser beam, generating thermal energy enough to ignite nEMs. A pressure-driven membrane actuator is fabricated by integrating a thin PDMS membrane to the nEMs-coated optical igniter, and the actuation behavior is characterized in response to pressure released by nEMs ignition with different numbers of nEMs coats. Finally, the pressure-driven membrane actuator is demonstrated in an alarm switch to trigger stable operation of an electric buzzer with a blinking light-emitting diode as a potential application.</P>