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Lee, Jaehong,Seo, Jungmok,Kim, Dayeong,Shin, Sera,Lee, Sanggeun,Mahata, Chandreswar,Lee, Hyo-Sung,Min, Byung-Wook,Lee, Taeyoon American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.12
<P>The fabrication of well-ordered metal nanoparticle structures onto a desired substrate can be effectively applied to several applications. In this work, well-ordered Ag nanoparticle line arrays were printed on the desired substrate without the use of glue materials. The success of the method relies on the assembly of Ag nanoparticles on the anisotropic buckling templates and a special transfer process where a small amount of water rather than glue materials is employed. The anisotropic buckling templates can be made to have various wavelengths by changing the degree of prestrain in the fabrication step. Ag nanoparticles assembled in the trough of the templates via dip coating were successfully transferred to a flat substrate which has hydrophilic surface due to capillary forces of water. The widths of the fabricated Ag nanoparticle line arrays were modulated according to the wavelengths of the templates. As a potential application, the Ag nanoparticle line arrays were used as SERS substrates for various probing molecules, and an excellent surface-enhanced Raman spectroscopy (SERS) performance was achieved with a detection limit of 10<SUP>–12</SUP> M for Rhodamine 6G.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-12/am5000382/production/images/medium/am-2014-000382_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5000382'>ACS Electronic Supporting Info</A></P>
Lee, Jaehong,Shin, Sera,Lee, Sanggeun,Song, Jaekang,Kang, Subin,Han, Heetak,Kim, SeulGee,Kim, Seunghoe,Seo, Jungmok,Kim, DaeEun,Lee, Taeyoon American Chemical Society 2018 ACS NANO Vol.12 No.5
<P>Highly stretchable fiber strain sensors are one of the most important components for various applications in wearable electronics, electronic textiles, and biomedical electronics. Herein, we present a facile approach for fabricating highly stretchable and sensitive fiber strain sensors by embedding Ag nanoparticles into a stretchable fiber with a multifilament structure. The multifilament structure and Ag-rich shells of the fiber strain sensor enable the sensor to simultaneously achieve both a high sensitivity and largely wide sensing range despite its simple fabrication process and components. The fiber strain sensor simultaneously exhibits ultrahigh gauge factors (∼9.3 × 10<SUP>5</SUP> and ∼659 in the first stretching and subsequent stretching, respectively), a very broad strain-sensing range (450 and 200% for the first and subsequent stretching, respectively), and high durability for more than 10 000 stretching cycles. The fiber strain sensors can also be readily integrated into a glove to control a hand robot and effectively applied to monitor the large volume expansion of a balloon and a pig bladder for an artificial bladder system, thereby demonstrating the potential of the fiber strain sensors as candidates for electronic textiles, wearable electronics, and biomedical engineering.</P> [FIG OMISSION]</BR>
Lee, Jaehong,Shin, Sera,Kang, Subin,Lee, Sanggeun,Seo, Jungmok,Lee, Taeyoon Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Graphene can be effectively applied as an ultrathin barrier for fluids, gases, and atoms based on its excellent impermeability. In this work, few-layer graphene was encapsulated on silver (Ag) nanoparticles for the fabrication of highly stable surface-enhanced Raman scattering (SERS) substrates, which has strong resistance to oxidation of the Ag nanoparticles. The few-layer graphene can be successfully grown on the surface of the Ag nanoparticles through a simple heating process. To prevent the agglomeration of the Ag nanoparticles in the fabrication process, poly(methyl methacrylate) (PMMA) layers were used as a solid carbon source instead of methane (CH4) gas generally used as a carbon source for the synthesis of graphene. X-ray diffraction (XRD) spectra of the few-layer graphene-encapsulated Ag nanoparticles indicate that the few-layer graphene can protect the Ag nanoparticles from surface oxidation after intensive annealing processes in ambient conditions, giving the highly stable SERS substrates. The Raman spectra of Rhodamine 6G (R6G) deposited on the stable SERS substrates exhibit maintenance of the Raman signal intensity despite the annealing process in air. The facile approach to fabricate the few-layer graphene-encapsulated Ag nanoparticles can be effectively useful for various applications in chemical and biological sensors by providing the highly stable SERS substrates.</P>
Development of a Wireless Power Supply System for an E-Bike
Jaehong Lee,Sangmin Lee,Myeongseok Kwak,Gyeonghoon Yeom,Seung-Hwan Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A wireless power transfer system for an electric bicycle was investigated in this study. Loosely coupled transmitter and receiver coils that are designed for an installation on a rack and a bike wheel were developed. Achieving required mutual inductance with compact size and light weight coils was the goal of the system design. To achieve the requirements, the transmitter and receiver coils were wound in a ferrite pot-core that increases coils’ self-inductances and confines magnetic flux to prevent coupling with a bike wheel and a rack. Using finite element analysis, the dependence of the quality factor and self-inductance of a coil design methodology using the ferrite pot-core was studied in this paper. It was found that eddy-current loss of coils wound in a pot-core increased highly near the air-gap. To achieve a high quality factor, coil should be located as deep inside of the pot-core. On the other hand, coils’ self-inductances decreased while coils were moved away from the air-gap. Also, mathematical analysis of a seriesparallel compensated wireless power transfer system was studied. Stability margin, efficiency, and induced voltage were considered to optimize the load resistance. The proposed system was evaluated using an experimental test-bed. Measured coilto-coil efficiency of the developed system was over 90 % and the overall efficiency was 73.2 % at its rated operation.
Bacille Calmette-Guerin (BCG) 백신 접종 후림프절염의 발생 빈도
김재홍 ( Jaehong Kim ),이규진 ( Kyujin Lee ),김종현 ( Jong Hyun Kim ),김성준 ( Seong Joon Kim ),이수영 ( Soo Young Lee ),이혜진 ( Hye Jin Lee ),조경순 ( Kyung Soon Cho ),권영주 ( Young Joo Kwon ),이병찬 ( Byoung Chan Lee ),조상민 대한소아감염학회 2016 Pediatric Infection and Vaccine Vol.23 No.1
목적: BCG 접종 후의 비교적 흔한 이상반응인 국소 림프절염은 일반적으로 1% 미만에서 발생하는데 BCG 균주와 접종법 등에 따라 발생률이 다를 수 있다. 현재 우리나라에서는 Danish 균주 피내법과 Tokyo 균주 경피법의 BCG가 접종되고 있으며, 이에 대한 국소 림프절염의 발생률을 조사하였다. 방법: 총 25개의 의료기관(종합병원 5개소, 소아청소년과 의원 20개소)에서 조사가 이루어졌다. BCG 균주의 종류는 접종 부위의 반흔을 직접 확인하였고, BCG 접종 후 림프절염의 발생 여부는 보호자에게 직접 질문을 하여 확인하였다. 림프절염이 발생한 경우는 그 위치, 크기, 화농화 여부 및 경과, 치료법에 대해서도 조사하였다. 결과: 모두 3,342례에서 조사되었고, 이 중 기준에 적합한 대상자만을 분석하였는데 총 3,222례로 Tokyo 균주 경피법이 2,501례, Danish 균주 피내법이 721례이었다. 림프절의 크기를 고려하지 않을 때의 BCG 림프절염은 각 균주마다 5례에서 발생하여 그 발생률이 Tokyo 균주 경피법은 0.20%, Danish 균주 피내법에서는 0.69%이었다(P=0.086). 그러나 국제보건기구의 기준, 즉 림프절의 직경이 1.5 cm 이상일 때를 림프절염이 발생한 것으로 정의했을 때 Tokyo 균주 경피법은 0.16% (4례), Danish 균주 피내법에서는 0.42% (3례)이었다. 결론: 현재 국내에서 사용하고 있는 두 가지 BCG 균주, Tokyo 균주 경피법과 Danish 균주 피내법에 대한 림프절염 발생률은 각각 0.20%와 0.69%로 두 균주 모두 받아들여지는 수치이다. Purpose: Bacille Calmette-Guerin (BCG) lymphadenitis is a relatively frequent local adverse reactions after BCG vaccination. Its incidence rate is usually <1%. However, this rate may be different according to BCG strain, vaccination method or skill, etc. In the Republic of Korea, two BCG strains are used: intradermal Danish-1331 or percutaneous Tokyo-172. We surveyed the incidence rates of BCG lymphadenitis. Methods: This survey was performed in total 25 centers (5 general hospitals, 20 private pediatric clinics). Immunized type of BCG strain in study subjects was verified by directly observing the scar. The occurrence of BCG lymphadenitis was asked to their parent. In cases of BCG lymphadenitis, location, diameter size, progression of suppuration, and treatment method were investigated, as well. Results: The total number of study subjects was 3,342. Among these, the subjects suitable for enrollment criteria (total 3,222; Tokyo strain 2,501, Danish strain 721) were analyzed. BCG lymphadenitis regardless of its size developed in each five of subjects per strains, therefore, its incidence rate was 0.20% in Tokyo and 0.69% in Danish strain, respectively (P=0.086). However, when applying the WHO criteria - the development of lymph node swelling with diameter 1.5 cm or more, the incidence rate of BCG lymphadenitis was 0.16% (4 cases) in Tokyo and 0.42% (3 cases) in Danish strain, respectively. Conclusions: The incidence rate of lymphadenitis in two BCG types, percutaneous Tokyo and intradermal Danish strain BCG, is 0.20% and 0.69%, respectively. Both rates are acceptable.