Fournier`s gangrene in Sweet syndrome

( Yoonsoo Kim ),( Dongjin Kim ),( Chanho Na ),( Bongseok Shin ),( Minsung Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Fournier``s Gangrene is a rapidly progressive necrotizing fasciitis of the groin, perianal and perineal region that is often polymicrobial in nature, often averaging 3 species of bacteria per patient. Sweet syndrome is a disorder of unknown etiology. It has been associated with autoimmune processes, malignancies, infections, drug reactions, and gastrointestinal disorders such as inflammatory bowel disease. A 31-year-old woman who presented with severe pain in her left elbow, along with fever, myalgia of 48 hour`s duration. Cultures and laboratory test yielded a diagnosis of Sweet syndrome and she was received intravenous injections of glucocorticoid for several days during hospitalization. After three days of discharge, the patient``s left buttock was noted to be mottled with a paucity of granulation tissue, therefore, the patient was taken for buttock debridement. After additional test, a diagnosis of Fournier`s gangerene was made. And antibiotics for gram negative, gram positive was injected for 7days. Gradually, wound healed copmpletely without severe sequelae and we performed primary-closure. Fournier``s gangrene is a rarely occurring, life-threatening emergency situation. In order to keep the patient alive, it is of critical importance to make a diagnosis as soon as possible, start broad-spectrum antibiotics, perform emergency surgical debridement, support the nutrition of the patient, and carry out suitable wound care.

Silicon photonic receiver and transmitter operating up to 36 Gb/s for λ~1550 nm.

Joo, Jiho,Jang, Ki-Seok,Kim, Sang Hoon,Kim, In Gyoo,Oh, Jin Hyuk,Kim, Sun Ae,Jeong, Gyu-Seob,Kim, Yoonsoo,Park, Jun-Eun,Kim, Sungwoo,Chi, Hankyu,Jeong, Deog-Kyoon,Kim, Gyungock Optical Society of America 2015 Optics express Vol.23 No.9

<P>We present the hybrid-integrated silicon photonic receiver and transmitter based on silicon photonic devices and 65 nm bulk CMOS interface circuits operating over 30 Gb/s with a 10(-12) bit error rate (BER) for λ ~1550nm. The silicon photonic receiver, operating up to 36 Gb/s, is based on a vertical-illumination type Ge-on-Si photodetector (Ge PD) hybrid-integrated with a CMOS receiver front-end circuit (CMOS Rx IC), and exhibits high sensitivities of -11 dBm, -8 dBm, and -2 dBm for data rates of 25 Gb/s, 30 Gb/s and 36 Gb/s, respectively, at a BER of 10(-12). The measured energy efficiency of the Si-photonic receiver is 2.6 pJ/bit at 25 Gb/s with an optical input power of -11 dBm, and 2.1 pJ/bit at 36 Gb/s with an optical power of -2 dBm. The hybrid-integrated silicon photonic transmitter, comprised of a depletion-type Mach-Zehnder modulator (MZM) and a CMOS driver circuit (CMOS Tx IC), shows better than 5.7 dB extinction ratio (ER) for 25 Gb/s, and 3 dB ER for 36 Gb/s. The silicon photonic transmitter achieves the data transmission with less than 10(-15) BER at 25 Gb/s, 10(-14) BER at 28 Gb/s, and 6 x 10(-13) BER with the energy efficiency of ~6 pJ/bit at 30 Gb/s.</P>

Aerodynamic pitch control design for reversal of missile’s flight direction

Kim, Yoonsoo,Kim, Byoung Soo,Park, JeongHo Professional Engineering Publishing Ltd 2014 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>This paper proposes a purely aerodynamic pitch control design scheme for agile missiles that need to reverse their flight directions for tracking a target. The main challenge in performing this kind of manoeuvre is that the missiles may enter the high angle of attack domain in which aerodynamic actuation is ineffective. Assuming that reliable aerodynamic data are available for the flight envelope, a systematic search algorithm is employed to find an aerodynamic control parameter and the motor thrust activation time, so as to enable the missile's required manoeuvre. The strength of the proposed design scheme is that no third control mechanism such as thrust vectoring is required for the missile control even in the high angle of attack domain. The proposed design scheme is tested on aerodynamic data available in literature, and is shown to be promising via simulations.</P>

Investigation of the growth and in situ heating transmission electron microscopy analysis of Ag₂S-catalyzed ZnS nanowires

Kim, Jung Han,Kim, Jong Gu,Song, Junghyun,Bae, Tae-Sung,Kim, Kyou-Hyun,Lee, Young-Seak,Pang, Yoonsoo,Oh, Kyu Hwan,Chung, Hee-Suk Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.436 No.-

<P><B>Abstract</B></P> <P>We investigated the semiconductor-catalyzed formation of semiconductor nanowires (NWs) – silver sulfide (Ag<SUB>2</SUB>S)-catalyzed zinc sulfide (ZnS) NWs – based on a vapor-liquid-solid (VLS) growth mechanism through metal-organic chemical vapor deposition (MOCVD) with a Ag thin film. The Ag<SUB>2</SUB>S-catalyzed ZnS NWs were confirmed to have a wurtzite structure with a width and length in the range of ∼30 nm to ∼80 nm and ∼1 μm, respectively. Using extensive transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) analyses from plane and cross-sectional viewpoints, the ZnS NWs were determined to have a c-axis, [0001] growth direction. In addition, the catalyst at the top of the ZnS NWs was determined to consist of a Ag<SUB>2</SUB>S phase. To support the Ag<SUB>2</SUB>S-catalyzed growth of the ZnS NWs by a VLS reaction, an in situ heating TEM experiment was conducted from room temperature to 840 °C. During the experiment, the melting of the Ag<SUB>2</SUB>S catalyst in the direction of the ZnS NWs was first observed at approximately 480 °C along with the formation of a carbon (C) shell. Subsequently, the Ag<SUB>2</SUB>S catalyst melted completely into the ZnS NWs at approximately 825 °C. As the temperature further increased, the Ag<SUB>2</SUB>S and ZnS NWs continuously melted and vaporized up to 840 °C, leaving only the C shell behind. Finally, a possible growth mechanism was proposed based on the structural and chemical investigations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag<SUB>2</SUB>S catalyzed ZnS nanowires were synthesized using a VLS method. </LI> <LI> Chemical and structural analyses were performed from the plane and cross-sectional viewpoints. </LI> <LI> An in situ heating TEM experiment was conducted from room temperature to 840 °C. </LI> <LI> A possible growth mechanism was suggested based on the structural and chemical investigation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Ulocladium Infection in a Healthy Individual

( Yoonsoo Kim ),( Inho Bea ),( Chanho Na ),( Bongseok Shin ),( Minsung Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Ulocladium, which is phylogenetically related to Alternaria, contains species that are food spoilers and plant pathogens, but also species that have potential as enzyme producers and bio-control agents. Ulocladium spp. are often found on dead vegetation, in soil, air and dust, but also on food and feedstuffs and on water-damaged building materials. A 67-year-old man presented at our clinic with 3-month history of an ulcer covered with crust on his both fore arms. The primary fungal medium had been incubated at 28°C. A colony appeared at the inoculation site after 4 days. By day 8, the colony had a diameter of 2 cm and was greyish brown and powdery. It was sporulating by this time. Many of the conidia were dark brown and had transverse and longitudinal septa, suggestive of Alternaria species. However, some conidia were coarsely verrucose. The isolate was sent, with clinical details only, to a fungal reference laboratory. It was identified as a Ulocladium species on morphological grounds. Based on the morphological features and molecular identification, the patient was diagnosed as Ulocladium atrum keratitis. He was successfully cured by oral sporanox and topical use of travogen cream. Diagnosis was done by culture isolation, histopathological examination. The main interest of this case is the rareness of Ulocladium atrum keratitis in an healthy individual and we also want to emphasize the good response to therapy.

Static Output Feedback Stabilization of Interconnected Systems

Yoonsoo Kim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10

This paper is concerned with the celebrated static output feedback control problem (SOFP) subject to linear constraints on control input K, e.g. bounds on control magnitude, zeros in some elements of K, etc. These constraints typically arise in the control of resource-limited systems interconnected to each other, where the local control for each system makes use of its own and neighbouring systems’ outputs only, and its magnitude is bounded. This control problem can be approached by a spectral-norm minimization technique (q-SNM), whose preliminary version was previously introduced with little mathematical justification but shown to be promising for the regular SOFP without control constraints. This paper mathematically justifies q-SNM by showing its explicit relationship with spectral radius, and extends q-SNM to accommodate various linear control constraints.

Remarks on Stability Robustness of Linear Quadratic Regulators

Yoonsoo Kim 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

Pitch Autopilot Design for Agile Missiles with Uncertain Aerodynamic Coefficients

Yoonsoo Kim,Byoung Soo Kim IEEE 2013 IEEE transactions on aerospace and electronic syst Vol.49 No.2

<P>The work presented here proposes two pitch autopilot designs for agile missiles which experience high pitch angles or angles of attack (AoA) during their manoeuvres. One great challenge pertaining to high AoA is that aerodynamic coefficients cannot be precisely predicted in a conventional wind tunnel environment. To directly address this challenge, the proposed autopilot designs (based on the integrator backstepping and H<SUB>∞</SUB>-norm minimization) do not require precise knowledge of such aerodynamic coefficients and so has a strong practical merit. Simulation results clearly testify this practical merit.</P>

20-Gb/s 5-<tex> $\text{V}_{\mathrm{PP}}$</tex> and 25-Gb/s 3.8-<tex> $\text{V}_{\mathrm{PP}}$</tex> Area-Efficient Modulator Drivers in 65-nm CMOS

Kim, Yoonsoo,Jeong, Gyu-Seob,Park, Jun-Eun,Park, Joonbae,Kim, Gyungock,Jeong, Deog-Kyoon IEEE 2016 IEEE transactions on circuits and systems. a publi Vol.63 No.11

<P>This brief presents two area-efficient drivers for a 50-Omega terminated optical modulator. Driver 1 adopts a double cascode with dynamic biasing that enables sufficient high-speed operation owing to the high transition frequency of the thin-oxide transistor. Therefore, it does not require area-consuming additional peaking inductors. A custom-designed shared inductor is used in Driver 2 for bandwidth enhancement with a small area penalty; the required total inductance is only 13.3% of the conventional shunt peaking case. The prototypes are fabricated in a 65-nm complementary metal-oxide-semiconductor process. Electrical measurement results show that Driver 1 exhibits a differential output swing of 5 V-PP, a data rate of 20 Gb/s, and a power consumption of 534 mW. The measured performance of Driver 2 is 3.8 V-PP and 348 mW at 25 Gb/s. The active areas of the proposed modulator drivers are only 0.068 mm(2) and 0.038 mm(2).</P>

한글 가변 폰트 서비스를 제공하기 위한 한글 매개변수 조절 사용자 인터페이스

김윤수 ( Yoonsoo Kim ),박순욱 ( Soonwook Park ),이현수 ( Hyunsoo Lee ),강결희 ( Kyeolhee Kang ),최재영 ( Jeayoung Choi ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2

하나의 폰트를 제작하기 위해서, 로마자 폰트는 200여자만 디자인하면 되지만, 한글 폰트는 11,172자나 되는 많은 글자를 하나하나 디자인해야 하는 어려움이 있다. 하나의 한글 폰트 제작에 많은 시간과 노력이 드는 기존 문제점을 해결하기 위해, 메타폰트와 같은 프로그래머블 폰트를 이용하는 방법이 제안되었으나, 이를 실제 사용하는 것은 용이하지 않다. 따라서 이러한 문제를 해결하기 위해 한글 가변폰트 서비스를 위한 한글 매개변수 조절 서비스 “STEMFONT’를 개발하였다. 본 논문에서는 STEMFONT 서비스에 대한 소개와 더불어 서비스 기능에 맞는 인터페이스 구성에 대해 설명한다. 이러한 인터페이스를 통해 사용자들이 쉽게 폰트를 제작할 수 있다.