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Jongmin Hwang,Jun Kim,Kee-Joon Choi,Min Soo Cho,남기병,You-Ho Kim 대한심장학회 2019 Korean Circulation Journal Vol.49 No.5
Background and Objectives: Wrist-worn wearable devices provide heart rate (HR) monitoring function via photoplethysmography technology. Recently, these devices have been used by patients to measure the HR when palpitation occurs, but few validation studies of these instruments have been conducted. We assessed the accuracy of these devices for measuring a HR. Methods: This study enrolled 51 consecutive patients with a history of paroxysmal supraventricular tachyarrhythmia (SVT) or paroxysmal palpitations who were scheduled to undergo an electrophysiological study (EPS). Three devices were assessed: Apple Watch Series 2 (Apple), Samsung Galaxy Gear S3 (Galaxy), and Fitbit Charge 2 (Fitbit). Patients were randomly assigned to wear 2 different devices. The HR at baseline and induced SVT were measured during the EPS. After successful ablation of SVT, HR measurements was also done during atrial and ventricular pacing study. Results: The mean patient age was 44.4±16.6 years and 27 patients were male (53%). The accuracy (within ±5 beats per minute [bpm] of an electrocardiogram [ECG] measurement) of the baseline HR measurements was 100%, 100%, and 94%, for Apple, Galaxy, and Fitbit, respectively. The HR during induced SVT ranged from 108 bpm to 228 bpm and the accuracy (within ±10 bpm of an ECG) was 100%, 90%, and 87% for the Apple, Galaxy, and Fitbit, respectively. During pacing study, accuracy of these devices was also acceptable but tended to decrease as the HR increased, and showed differences between the devices. Conclusions: Wrist-worn wearable devices accurately measure baseline and induced SVT HR.
Hwang, Soon-Kyung,Lim, Hwang-Tae,Minai-Tehrani, Arash,Lee, Eun-Sun,Park, Jongmin,Park, Seung Bum,Beck Jr., George R.,Cho, Myung-Haing American Thoracic Society 2009 American journal of respiratory and critical care Vol.179 No.12
<P>RATIONALE: Difficulties in achieving long-term survival of patients with lung cancer treated with conventional therapies suggest that novel approaches are required. Recent advances in aerosol-mediated gene delivery have provided the possibility of an alternative for the safe and effective treatment of lung cancer. OBJECTIVES: To investigate the repeated effect of carboxyl-terminal modulator protein (CTMP) on multistage lung tumorigenesis. In this study, we addressed this question by studying the effects of lentivirus-based CTMP in the lungs of 9- and 13-week-old K-ras(LA1) mice, a model of lung cancer. METHODS: An aerosol of lentivirus-based CTMP was delivered into 9- and 13-week-old K-ras(LA1) mice, a model of lung cancer, through a nose-only inhalation system twice a week for 4 weeks. The effects of CTMP on lung cancer progression and Akt-related signals were evaluated. MEASUREMENTS AND MAIN RESULTS: Long-term repeated delivery of CTMP effectively reduced tumor progression in the lungs at different stages of development. Lentiviral-CTMP inhibited protein synthesis and cell cycle and altered Akt signaling pathway in the lungs of 9-week-old K-ras(LA1) mice, and increased apoptosis was observed in the lungs of 13-week-old K-ras(LA1) mice. CONCLUSIONS: Long-term repeated viral delivery of CTMP may provide a useful tool for designing lung tumor treatment.</P>
Size-controlled SiO2nanoparticles as scaffold layers in thin-film perovskite solar cells
Hwang, Sun Hye,Roh, Jongmin,Lee, Jungsup,Ryu, Jaehoon,Yun, Juyoung,Jang, Jyongsik The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.39
<P>Perovskite-based solar cells have received much recent research attention for renewable-energy applications because of their high efficiency and long-term stability. Here, we report perovskite solar cells formed using a scaffold layer composed of size-controlled SiO2nanoparticles (NPs). The infiltration of perovskite into the scaffold layer depended strongly on the size of the SiO2NPs. We investigated the effects of scaffold layers comprised of SiO2NPs that were 15, 30, 50, 70, and 100 nm in diameter on the properties of perovskite films. The performance of perovskite solar cells based on 50 nm diameter SiO2NPs exhibited a current density (<I>J</I>sc) of 16.4 mA cm<SUP>−2</SUP>, a open-circuit voltage (<I>V</I>oc) of 1.05 V, and a power-conversion efficiency (PCE) of 11.45%, which represent a significant improvement compared with perovskite solar cells fabricated using a TiO2scaffold layer, where<I>J</I>sc= 17.3 mA cm<SUP>−2</SUP>,<I>V</I>oc= 0.94 V, and the PCE was 10.29%.</P>
Hwang, Ee Taek,Lee, Byoungsoo,Zhang, Meiling,Jun, Seung-Hyun,Shim, Jongmin,Lee, Jinwoo,Kim, Jungbae,Gu, Man Bock The Royal Society of Chemistry 2012 GREEN CHEMISTRY Vol.14 No.7
<P>Subtilisin Carlsberg (SC) was immobilized and stabilized on magnetically-separable mesoporous silica (Mag-MSU-F) in the form of nanoscale enzyme reactors (NERs) based on the ship-in-a-bottle mechanism. Stabilized NERs of SC (NER-SC) were freeze-dried and successfully used for the transesterification of <I>N</I>-acetyl-<SMALL>L</SMALL>-phenylalanine ethyl ester with <I>n</I>-propanol in isooctane. Magnetic separation of Mag-MSU-F facilitated the repeated usages of stable NER-SC. This is the first demonstration for the use of stable and magnetically-separable NERs in an organic solvent, which has the potential for environmentally-friendly synthesis using enzymes in organic solvents.</P> <P>Graphic Abstract</P><P>Highly-stable and magnetically-separable nanoscale enzyme reactors for enzyme-catalyzed synthetic reactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2gc35559k'> </P>
Hwang, Jongkook,Woo, Seung Hee,Shim, Jongmin,Jo, Changshin,Lee, Kyu Tae,Lee, Jinwoo American Chemical Society 2013 ACS NANO Vol.7 No.2
<P>We report a facile “one-pot” method for the synthesis of Sn-embedded carbon–silica (CS) mesostructured (nanostructured) composites through the selective interaction of resol (carbon precursor), tetraethylorthosilicate (TEOS), and tributylphenyltin (Sn precursor) with an amphiphilic diblock copolymer, poly(ethylene oxide-<I>b</I>-styrene), PEO-<I>b</I>-PS. A unique morphology transition from Sn nanowires to spherical Sn nanoparticles embedded in CS framework has been obtained. Metallic Sn species are homogeneously embedded in a rigid CS framework and are effectively confined within the nanostructures. The resulting composites are used as anode materials for lithium-ion batteries and exhibit high specific capacities (600 mA h g <SUP>–1</SUP> at a current density of 45 mA g<SUP>–1</SUP>, and 440 mA h g<SUP>–1</SUP> at a current density of 300 mA g<SUP>–1</SUP>) and an excellent cyclability of over 100 cycles with high Coulombic efficiency. Most of all, the novel method developed in this work for synthesizing functional hybrid materials can be extended to the preparation of various functional nanocomposites owing to its versatility and facileness.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-2/nn303570s/production/images/medium/nn-2012-03570s_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn303570s'>ACS Electronic Supporting Info</A></P>
효율적인 객체 접근을 위한 객체 관리기의 설계 및 구현
이종민(Jongmin Lee),정영식(Young-Sik Jeong),손진곤(Jin-Gon Shon),황종선(Chong-Sun Hwang) 한국정보과학회 1993 한국정보과학회 학술발표논문집 Vol.20 No.1
객체 관리기(Object Manager: OM)는 객체지향 데이타베이스 시스템의 상위 계층과 하위 계층을 연결하는 구성 요소로 객체 지속성을 지원하여 프로그래머에게 하부 저장구조의 관리를 의식하지 않는 자유로운 프로그래밍 환경을 제공한다. 이 연구에서는 객체 지속성을 보장하고 효율적인 객체 접근은 위한 OM을 설계, 구현한다. 이 OM은 하부 저장구조에 관한 연산을 은폐하여 프로그래머에게 투명한 객체 연산을 제공하고 객체 참조시 소요되는 연산을 단순화하여 객체 접근 효율을 향상시켰다.
Roh, Jongmin,Hwang, Sun Hye,Jang, Jyongsik American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.22
<P>Single-crystalline, octahedral CeO<SUB>2</SUB>:Eu<SUP>3+</SUP> nanocrystals, successfully prepared using a simple hydrothermal method, were investigated to determine their photovoltaic properties in an effort to enhance the light-harvesting efficiency of dye-sensitized solar cells (DSSCs). The size of the CeO<SUB>2</SUB>:Eu<SUP>3+</SUP> nanocrystals (300–400 nm), as well as their mirrorlike facets, significantly improved the diffuse reflectance of visible light. Excitation of the CeO<SUB>2</SUB>:Eu<SUP>3+</SUP> nanocrystal with 330 nm ultraviolet light was re-emitted via downconversion photoluminescence (PL) from 570 to 672 nm, corresponding to the <SUP>5</SUP>D<SUB>0</SUB> → <SUP>7</SUP>F<SUB>J</SUB> transition in the Eu<SUP>3+</SUP> ions. Downconversion PL was dominant at 590 nm and had a maximum intensity for 1 mol % Eu<SUP>3+</SUP>. The CeO<SUB>2</SUB>:Eu<SUP>3+</SUP> nanocrystal-based DSSCs exhibited a power conversion efficiency of 8.36%, an increase of 14%, compared with conventional TiO<SUB>2</SUB> nanoparticle-based DSSCs, because of the strong light-scattering and downconversion PL of the CeO<SUB>2</SUB>:Eu<SUP>3+</SUP> nanocrystals.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-22/am505194k/production/images/medium/am-2014-05194k_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am505194k'>ACS Electronic Supporting Info</A></P>