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Park JongBeom,Lee Soo Yeun,Lee Hyung Soon,Shin Sug Kyun,Kim Tae Hwan 대한이식학회 2021 Korean Journal of Transplantation Vol.35 No.1
Background: The aim of this study was to evaluate the safety and feasibility of prophylactic ureteric stenting during kidney transplantation (KT). Methods: The authors retrospectively reviewed patients who underwent KT between June 2016 and June 2019. The prophylactic ureteral stenting group (double-J [DJ]) and no-stent group (no-DJ) were compared with respect to the clinical data and surgical outcomes. Results: A total of 42 patients underwent KT; 17 patients were classified into the DJ group and 25 patients into the no-DJ group. Antithymocyte globulin induction and donor- specific antibody positivity were significantly higher in the DJ group. There were no significant differences between the groups in terms of symptomatic urinary tract infection (UTI). The time to postoperative UTI was significantly shorter in the DJ group than in the no-DJ group (33.5±7.8 vs. 105.3±71.6 days, P=0.013). The development of postoperative BK viremia was significantly higher in the no-DJ group (0.0% vs. 16.0%, P=0.035). Urologic complications were significantly higher in the no-DJ group (0.0% vs. 16.0%, P=0.035). In the no-DJ group, urologic complications occurred in four patients: ureteroneocystostomy stenosis in three patients and ureteroneocystostomy leakage in one patient. Percutaneous ureteral interventions were performed for all patients using percutaneous nephrostomy and reno-uretero-vesical stenting. However, there were no postoperative urologic complications in the DJ group. Conclusions: Prophylactic ureteric stenting during KT may be safe and feasible without significantly increasing the incidence of UTI and BK viremia. Additionally, prophylactic ureteric stenting may reduce urologic complications after KT
Preparation of Bismuth Telluride Films with High Thermoelectric Power Factor
Na, Jongbeom,Kim, Younghoon,Park, Teahoon,Park, Chihyun,Kim, Eunkyoung American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.47
<P>Highly conductive n-type Bi2Te3 films on a flexible substrate were prepared via electrodeposition followed by a transfer process using an adhesive substrate. The growth of the Bi2Te3 crystals was precisely controlled by an electrochemical deposition potential (V-dep), which was critical to the preferred orientation of the crystal growth along the (110) direction and thus to the properties of a flexible thermoelectric generator (FTEG). A Bi2Te3 film prepared under V-dep of 0.02 V showed high electrical conductivity (691 S cm(-1)) with a maximum power factor of 1473 mu W m(-1) K-2, which is the highest among the Bi2Te3 films prepared by the electrodeposition methods. As-prepared FTEG was bendable, showing only a small resistance change after 300 repeated bending cycles. Combined with the n-type Bi2Te3 FTEG, a prototype p-n-type flexible thermoelectric (pn-FTEG) was prepared using p-type poly(3,4-ethylene dioxythiophene)s. The pn-FTEG (5-couples) generated an output voltage of 5 mV at Delta T = 12 K with high output power of 56 nW (or 105 nWg(-1)). These results indicate that the FTEG can reproducibly work well in a bent state and has high application potential for harvesting thermal energy from curved sources such as human body temperature.</P>
박승각 ( Seunggak Park ),박승현 ( Seunghyun Park ),배기운 ( Giwoon Bae ),임종범 ( Jongbeom Lim ),전광길 ( Gwanggil Jeon ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
최근 가구별 라이프스타일의 변화로 외식 소비문화가 증가하면서 간편하면서도 건강한 음식인 회전초밥을 찾는 수요도 늘어나고 있다. 하지만 기존 회전초밥 가게는 레일 위의 초밥을 일일이 직접 확인하고 만들어야하는 번거로움이 있어 판매량 및 초밥 현황 파악에 정확성이 낮으며, 소비자는 초밥의 신선도가 떨어져도 알 방법 없다. 본 논문은 이러한 문제들의 해결책으로 라즈베리파이를 이용한 초밥관리 시스템을 제안한다. 이 시스템의 첫 번째 기능은 회전하는 레일에 부착된 파이카메라로 영상처리를 하여 불필요한 인력 없이 한눈에 레일 위의 초밥을 확인한다. 두 번째 기능은 RFID 태그로 시간을 체크하여 최대한의 신선도를 유지하면서 고객에게 상품을 제공한다. 세 번째 기능은 카메라와 RFID로 판매량을 파악하고 웹에서 조회 가능하게 한다. 즉, 이 시스템은 실시간으로 판매량과 초밥 공급을 확인할 수 있도록 하고, 더욱 신선한 상품을 제공하여 상품의 질적 향상과 일의 효율성을 높일 수 있도록 한다.
Park, Teahoon,Na, Jongbeom,Kim, Byeonggwan,Kim, Younghoon,Shin, Haijin,Kim, Eunkyoung American Chemical Society 2015 ACS NANO Vol.9 No.12
<P>Photothermal effects in poly(3,4-ethylenedioxythiophene)s (PEDOTs) were explored for pyroelectric conversion. A poled ferroelectric film was coated on both sides with PEDOT <I>via</I> solution casting polymerization of EDOT, to give highly conductive and effective photothermal thin films of PEDOT. The PEDOT films not only provided heat source upon light exposure but worked as electrodes for the output energy from the pyroelectric layer in an energy harvester hybridized with a thermoelectric layer. Compared to a bare thermoelectric system under NIR irradiation, the photothermal-pyro-thermoelectric device showed more than 6 times higher thermoelectric output with the additional pyroelectric output. The photothermally driven pyroelectric harvesting film provided a very fast electric output with a high voltage output (<I>V</I><SUB>out</SUB>) of 15 V. The pyroelectric effect was significant due to the transparent and high photothermal PEDOT film, which could also work as an electrode. A hybrid energy harvester was assembled to enhance photoconversion efficiency (PCE) of a solar cell with a thermoelectric device operated by the photothermally generated heat. The PCE was increased more than 20% under sunlight irradiation (AM 1.5G) utilizing the transmitted light through the photovoltaic cell as a heat source that was converted into pyroelectric and thermoelectric output simultaneously from the high photothermal PEDOT electrodes. Overall, this work provides a dynamic and static hybrid energy cell to harvest solar energy in full spectral range and thermal energy, to allow solar powered switching of an electrochromic display.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-12/acsnano.5b04042/production/images/medium/nn-2015-040428_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b04042'>ACS Electronic Supporting Info</A></P>
Transparent Electrochemical Gratings from a Patterned Bistable Silver Mirror
Park, Chihyun,Na, Jongbeom,Han, Minsu,Kim, Eunkyoung American Chemical Society 2017 ACS NANO Vol.11 No.7
<P>Silver mirror patterns were formed reversibly on a polystyrene (PS)-patterned electrode to produce gratings through the electrochemical reduction of silver ions. The electrochemical gratings exhibited high transparency (T > 95%), similar to a see-through window, by matching the refractive index of the grating pattern with the surrounding medium. The gratings switch to a diffractive state upon the formation of a mirror pattern (T < 5%) with a high diffraction efficiency up to 40%, providing reversible diffractive gratings. The diffraction state was maintained in the voltage-off state (V-off) for 40 min, which demonstrated bistable reversible electrochemical grating (BREG) behavior. By carefully combining the BREGs through period matching, dual-color switching was achieved within the full color region, which exhibited three distinct optical switching states between -2.5, 0, and +2.5 V. The wide range of light tenability using the metallic BREGs developed herein enabled IR modulation, NIR light reflection, and on-demand heat transfer.</P>
ODAR: Aerial Manipulation Platform Enabling Omnidirectional Wrench Generation
Park, Sangyul,Lee, Jeongseob,Ahn, Joonmo,Kim, Myungsin,Her, Jongbeom,Yang, Gi-Hun,Lee, Dongjun IEEE 2018 IEEE/ASME transactions on mechatronics Vol.23 No.4
<P>We propose a novel aerial manipulation platform, an omnidirectional aerial robot, that is capable of omnidirectional wrench generation with opportunistically distributed/aligned Sectional rotors. To circumvent the tight thrust margin and weight budget of currently available rotor and battery technologies, we propose a novel design optimization framework, which maximizes the minimum-guaranteed control force/torque for any attitude while incorporating such important and useful aspects as interrotor aerointerference, anisotropic task requirement, gravity compensation, etc. We also provide a closed-form solution of infinity-norm optimal control allocation to avoid rotor saturation with the tight thrust margin. Further, we elaborate the notion of electronic speed controller induced singularity and devise a novel selective mapping algorithm to substantially subdue its destabilizing effect. Experiments are performed to validate the theory, which demonstrate such capabilities not possible with typical aerial manipulation systems, namely, separate translation and attitude control on SE(3), hybrid pose/wrench control with downward force of 60 N much larger than its own weight (2.6 kg), and peg-in-hole teleoperation with a radial tolerance of 0.5 mm.</P>