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Kim, Gyungock,Park, Jeong Woo,Kim, In Gyoo,Kim, Sanghoon,Kim, Sanggi,Lee, Jong Moo,Park, Gun Sik,Joo, Jiho,Jang, Ki-Seok,Oh, Jin Hyuk,Kim, Sun Ae,Kim, Jong Hoon,Lee, Jun Young,Park, Jong Moon,Kim, Do- Optical Society of America 2011 Optics express Vol.19 No.27
<P>We present high performance silicon photonic circuits (PICs) defined for off-chip or on-chip photonic interconnects, where PN depletion Mach-Zehnder modulators and evanescent-coupled waveguide Ge-on-Si photodetectors were monolithically integrated on an SOI wafer with CMOS-compatible process. The fabricated silicon PIC(off-chip) for off-chip optical interconnects showed operation up to 30 Gb/s. Under differential drive of low-voltage 1.2 V(pp), the integrated 1 mm-phase-shifter modulator in the PIC(off-chip) demonstrated an extinction ratio (ER) of 10.5dB for 12.5 Gb/s, an ER of 9.1dB for 20 Gb/s, and an ER of 7.2 dB for 30 Gb/s operation, without adoption of travelling-wave electrodes. The device showed the modulation efficiency of V(π)L(π) ~1.59 Vcm, and the phase-shifter loss of 3.2 dB/mm for maximum optical transmission. The Ge photodetector, which allows simpler integration process based on reduced pressure chemical vapor deposition exhibited operation over 30 Gb/s with a low dark current of 700 nA at -1V. The fabricated silicon PIC(intra-chip) for on-chip (intra-chip) photonic interconnects, where the monolithically integrated modulator and Ge photodetector were connected by a silicon waveguide on the same chip, showed on-chip data transmissions up to 20 Gb/s, indicating potential application in future silicon on-chip optical network. We also report the performance of the hybrid silicon electronic-photonic IC (EPIC), where a PIC(intra-chip) chip and 0.13μm CMOS interface IC chips were hybrid-integrated.</P>
Kim, Kab-Jin,Kim, Se Kwon,Hirata, Yuushou,Oh, Se-Hyeok,Tono, Takayuki,Kim, Duck-Ho,Okuno, Takaya,Ham, Woo Seung,Kim, Sanghoon,Go, Gyoungchoon,Tserkovnyak, Yaroslav,Tsukamoto, Arata,Moriyama, Takahiro Nature Publishing Group 2017 NATURE MATERIALS Vol.16 No.12
Antiferromagnetic spintronics is an emerging research field which aims to utilize antiferromagnets as core elements in spintronic devices. A central motivation towards this direction is that antiferromagnetic spin dynamics is expected to be much faster than its ferromagnetic counterpart. Recent theories indeed predicted faster dynamics of antiferromagnetic domain walls (DWs) than ferromagnetic DWs. However, experimental investigations of antiferromagnetic spin dynamics have remained unexplored, mainly because of the magnetic field immunity of antiferromagnets. Here we show that fast field-driven antiferromagnetic spin dynamics is realized in ferrimagnets at the angular momentum compensation point T<SUB>A</SUB>. Using rare earth–3d-transition metal ferrimagnetic compounds where net magnetic moment is nonzero at T<SUB>A</SUB>, the field-driven DW mobility is remarkably enhanced up to 20 km s<SUP>−1</SUP> T<SUP>−1</SUP>. The collective coordinate approach generalized for ferrimagnets and atomistic spin model simulations show that this remarkable enhancement is a consequence of antiferromagnetic spin dynamics at T<SUB>A</SUB>. Our finding allows us to investigate the physics of antiferromagnetic spin dynamics and highlights the importance of tuning of the angular momentum compensation point of ferrimagnets, which could be a key towards ferrimagnetic spintronics.
Kim, Sanghoon,Kim, Yangrae,Kim, Yongyoun International Academy of Physical Therapy Research 2019 Journal of International Academy of Physical Ther Vol.10 No.2
Background: Vibration exercise after ankle surgery improves proprioception and ankle muscle strength through vibration stimulation. Objective: To examine the effects of vibration exercise on the ankle stability. Design: Randomized controlled clinical trial (single blind) Methods: Twenty soccer players were randomly divided into experimental group and control group. The Vibration exercise program was conducted 12 weeks and 3 times a week. Ankle joint proprioceptive sensory test and Isokinetic muscle strength test were performed using Biodex system pro III to measure plantar flexion / dorsiflexion and eversion / inversion motion. Results: The result of isokinetic test of ankle joint is showed significant improvement in all measurement items, such as leg flexion, lateral flexion, external and internal muscle forces, compared to previous ones by performing vibration movements for 12 weeks. However, in the comparison group, plantar flexor ($30^{\circ}$), eversion muscle ($120^{\circ}$), inversion ($30^{\circ}$) of limb muscle strength were significantly improved compared with the previous phase; was no significant difference in dorsi-flexion. There was no significant difference between groups in all the items. Conclusions: In this study, we analyzed the effects of rehabilitation exercise on soccer players who had reconstructed with an ankle joint ligament injury through vibration exercise device. As a result, we could propose an effective exercise method to improve the ability, and confirmed the applicability as an appropriate exercise program to prevent ankle injuries and help quick return.
Kim, Gyungock,Park, Jeong Woo,Kim, In Gyoo,Kim, Sanghoon,Jang, Ki-Seok,Kim, Sun Ae,Oh, Jin Hyuk,Joo, Jiho,Kim, Sanggi Optical Society of America 2014 Optics letters Vol.39 No.8
<P>We present small-sized depletion-type silicon Mach-Zehnder (MZ) modulator with a vertically dipped PN depletion junction (VDJ) phase shifter based on a CMOS compatible process. The fabricated device with a 100 μm long VDJ phase shifter shows a VπLπ of 0.6??Vcm with a 3 dB bandwidth of 50??GHz at -2??V bias. The measured extinction ratios are 6 and 5.3 dB for 40 and 50??Gb/s operation under 2.5??Vpp differential drive, respectively. On-chip insertion loss is 3 dB for the maximum optical transmission. This includes the phase-shifter loss of 1.88??dB/100??μm, resulting mostly from the extra optical propagation loss through the polysilicon-plug structure for electrical contact, which can be readily minimized by utilizing finer-scaled lithography nodes. The experimental result indicates that a compact depletion-type MZ modulator based on the VDJ scheme can be a potential candidate for future chip-level integration.</P>
Sanghoon Kim,Yangrae Kim,Yongyoun Kim 국제물리치료연구학회 2019 Journal of International Academy of Physical Ther Vol.10 No.2
Background: Vibration exercise after ankle surgery improves proprioception and ankle muscle strength through vibration stimulation. Objective: To examine the effects of vibration exercise on the ankle stability. Design: Randomized controlled clinical trial (single blind) Methods: Twenty soccer players were randomly divided into experimental group and control group. The Vibration exercise program was conducted 12 weeks and 3 times a week. Ankle joint proprioceptive sensory test and Isokinetic muscle strength test were performed using Biodex system pro Ⅲ to measure plantar flexion / dorsiflexion and eversion / inversion motion. Results: The result of isokinetic test of ankle joint is showed significant improvement in all measurement items, such as leg flexion, lateral flexion, external and internal muscle forces, compared to previous ones by performing vibration movements for 12 weeks. However, in the comparison group, plantar flexor (30°), eversion muscle (120°), inversion (30°) of limb muscle strength were significantly improvedcompared with the previous phase; was no significant difference in dorsi-flexion. There was no significant difference between groups in all the items. Conclusions: In this study, we analyzed the effects of rehabilitation exercise on soccer players who had reconstructed with an ankle joint ligament injury through vibration exercise device. As a result, we could propose an effective exercise method to improve the ability, and confirmed the applicability as an appropriate exercise program to prevent ankle injuries and help quick return.
고혈관성 종양으로 오인된 Trichophyton verrucosum에 의한 두피 백선종창 1례
Kim Kyung-Ran,Park Hwanhee,Kim Doo Ri,Yoon Yoonsun,Jeon Chiman,Lee Sanghoon,Lim So Young,Kim Ji Hye,Kim Yae-Jean 대한소아감염학회 2022 Pediatric Infection and Vaccine Vol.29 No.2
A dermatophyte is a zoonotic infection that causes infection on the skin, hair, and nails and is transmitted through contact. The species of Microsporum, Trichophyton, and Epidermophyton are the major dermatophytes that infect humans. Tinea capitis is a dermatophyte infection in the scalp, and it may progress to kerion celsi, including severe redness, swelling, and pus formation. Kerion celsi is sometimes misdiagnosed as a bacterial infection or a tumor. Trichophyton verrucosum is a zoophilic dermatophyte that mainly causes infection in cattle. It can be spread to dairy farmers or ranchers who have frequent contact with infected cattle. We report a pediatric case who received scalp tumor excision and a split-thickness skin graft for extensive and severe inflammatory scalp tumors that occurred after contact with cattle with ringworm. Finally, the patient was diagnosed with kerion celsi caused by T. verrucosum infection. This was based on the patient’s medical history, clinical manifestations, and histopathologic findings. 피부사상균은 접촉을 통해 피부, 모발, 손발톱 등에 감염을 일으키며, 심한 경우 백선종창으로 진행되기도 한다. 건강했던 4세 여자 환자가 심한 두피병변으로 내원하여 세균, 진균감염뿐만 아니라 고혈관성 종양도 의심되어 두피 종양 절제술과 피부이식까지 받았다. 저자들은 면밀한 병력청취와 신체 진찰 및 임상양상을 토대로 Trichophyton verrucosum을 의심하여, 최종적으로 조직병리검사 소견을 종합하여 T. verrucosum에 의한 백선종창으로 진단 및 치료한 증례 1 례를 보고하는 바이다.
Kim, Sanghoon,Oh, Joon-Suk,Kim, Myeong-Gi,Jang, Woojin,Wang, Mei,Kim, Youngjun,Seo, Hee Won,Kim, Ye Chan,Lee, Jun-Ho,Lee, Youngkwan,Nam, Jae-Do American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.20
<P>Here we introduce the electromagnetic shielding effectiveness (SE) of reduced graphene oxide (RGO) sheets interleaved between polyetherimide (PEI) films fabricated by electrophoretic deposition (EPD). Incorporating only 0.66 vol % of RGO, the developed PEI/RGO composite films exhibited an electromagnetic interference shielding effectiveness (EMI SE) at 6.37 dB corresponding to ∼50% shielding of incident waves. Excellent flexibility and optical transparency up to 62% of visible light was demonstrated. It was achieved by placing the RGO sheets in the localized area as a thin film (ca. 20 nm in thickness) between the PEI films (ca. 2 μm) to be an interleaved and alternating structure. This unique interleaved structure without any delamination areas was fabricated by a successive application of cathodic and anodic EPD of both RGO and PEI layers. The EPD fabrication process was ensured by an alternating deposition of the quarternized-PEI drops and RGO, each taking positive and negative charges, respectively, in the water medium. We believe that the developed facile fabrication method of RGO interleaved structure with such low volume fraction has great potential to be used as a transparent EMI shielding material.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-20/am503893v/production/images/medium/am-2014-03893v_0009.gif'></P>
Magnetic droplet nucleation with a homochiral Néel domain wall
Kim, Sanghoon,Jang, Peong-Hwa,Kim, Duck-Ho,Ishibashi, Mio,Taniguchi, Takuya,Moriyama, Takahiro,Kim, Kab-Jin,Lee, Kyung-Jin,Ono, Teruo American Physical Society 2017 Physical Review B Vol.95 No.22
<P>We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on magnetic domain nucleation in a ferromagnetic thin film with perpendicular magnetic anisotropy. We propose an extended droplet model to determine the nucleation field as a function of the in-plane field. The model can explain the experimentally observed nucleation in a Co/Ni microstrip with an interfacial DMI. The results are also reproduced by micromagnetic simulation based on the string model. The electrical measurement method proposed here can be widely used to quantitatively determine the DMI energy density.</P>