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JeongIl Yu,HeeChul Park,DooHo Choi,JaeMyoung Noh,Dongryul Oh,JunSu Park,JiHyun Chang,SeungTae Kim,Jeeyun Lee,SeHoon Park,JoonOh Park,YoungSuk Park,HoYeong Lim,WonKi Kang 대한방사선종양학회 2016 Radiation Oncology Journal Vol.34 No.1
Purpose: A prospective phase II trial was conducted to evaluate the effectiveness and toxicity of regional hyperthermia and whole liver irradiation (WLI) for numerous chemorefractory liver metastases from colorectal cancer. Materials and Methods: Enrolled patients had numerous chemorefractory hepatic metastases from colorectal cancer. Five sessions of hyperthermia and seven fractions of 3-gray WLI were planned. Health-related quality of life (HRQoL) was determined using the Korean version of the European Organization for Research and Treatment of Cancer quality of life questionnaire C-30 and the Functional Assessment of Cancer Therapy-Hepatobiliary version 4.0. Objective and pain response was evaluated. Results: A total of 12 patients consented to the study and the 10 who received WLI and hyperthermia were analyzed. WLI was completed as planned in nine patients and hyperthermia in eight. Pain response was partial in four patients and stable in four. Partial objective response was achieved in three patients (30.0%) and stable disease was seen in four patients at the 1-month follow-up. One patient died 1 month after treatment because of respiratory failure related to pleural metastasis progression. Other grade III or higher toxicities were detected in three patients; however, all severe toxicities were related to disease progression rather than treatment. No significant difference in HRQoL was noted at the time of assessment for patients who were available for questionnaires. Conclusion: Combined WLI and hyperthermia were well tolerated without severe treatment-related toxicity with a promising response from numerous chemorefractory hepatic metastases from colorectal cancer.
Park, Min-Gu,Lee, Dong-Hun,Jung, Heechul,Choi, Jeong-Hee,Park, Cheol-Min American Chemical Society 2018 ACS NANO Vol.12 No.3
<P>To design an easily manufactured, large energy density, highly reversible, and fast rate-capable Li-ion battery (LIB) anode, Co-Sn intermetallics (CoSn<SUB>2</SUB>, CoSn, and Co<SUB>3</SUB>Sn<SUB>2</SUB>) were synthesized, and their potential as anode materials for LIBs was investigated. Based on their electrochemical performances, CoSn<SUB>2</SUB> was selected, and its C-modified nanocomposite (CoSn<SUB>2</SUB>/C) as well as Ti- and C-modified nanocomposite (CoSn<SUB>2</SUB>/<I>a</I>-TiC/C) was straightforwardly prepared. Interestingly, the CoSn<SUB>2</SUB>, CoSn<SUB>2</SUB>/C, and CoSn<SUB>2</SUB>/<I>a</I>-TiC/C showed conversion/nonrecombination, conversion/partial recombination, and conversion/full recombination during Li insertion/extraction, respectively, which were thoroughly investigated using <I>ex situ</I> X-ray diffraction and extended X-ray absorption fine structure analyses. As a result of the interesting conversion/full recombination mechanism, the easily manufactured CoSn<SUB>2</SUB>/<I>a</I>-TiC/C nanocomposite for the Sn-based Li-ion battery anode showed large energy density (first reversible capacity of 1399 mAh cm<SUP>-3</SUP>), high reversibility (first Coulombic efficiency of 83.2%), long cycling behavior (100% capacity retention after 180 cycles), and fast rate capability (appoximately 1110 mAh cm<SUP>-3</SUP> at 3<I>C</I> rate). In addition, degradation/enhancement mechanisms for high-capacity and high-performance Li-alloy-based anode materials for next-generation LIBs were also suggested.</P> [FIG OMISSION]</BR>
Heechul Park,Sung-Bae Park,Junseong Kim,Hyeonjeong Jeon,Sein Choi,Seungyeon Lee,Eunchong Oh,Soenghwi Hwang,Hyunjung Kim,Jungho Kim,Sunghyun Kim 대한의생명과학회 2020 Biomedical Science Letters Vol.26 No.3
Staphylococcus aureus (S. aureus) is known as a bacterium that can cause skin infections, respiratory system infections, and sinusitis; however, it can exist as a normal flora rather than a pathogen. Recently, methicillin-resistant S. aureus (MRSA) infections have emerged in the community as a new variant of community-associated (CA)-MRSA. In the present study, S. aureus and MRSA were isolated and cultured by collecting samples from facilities and environments where students and educational personnel have multiple contacts on university campuses; specifically, the nostrils and hands of college students were tested from July to September of 2019. The molecular properties of the isolated MRSA were analyzed, and the one MRSA strain was isolated from the university campuses. One MRSA that was isolated and cultured on campus was the mec complex group A and staphylococcal cassette chromosome (SCC) mec type II, which is a characteristic of healthcare-associated (HA)-MRSA, and SCCmec type V, which is a characteristic of CA-MRSA. This result was similar to other studies wherein the SCCmec type II was detected in SCCmec typing analysis in CA-MRSA. To confirm whether there is a new variant of CA-MRSA in the Republic of Korea, additional follow-up studies on the analysis of virulence factors of MRSA are needed by additionally separating CA-MRSA from the body parts of university students and educational personnel.
Shinyun Park,Eunmok Yang,Hosik Park,Heechul Choi 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
Halloysite nanotubes (HNTs) were functionalized using 3-aminopropyltriethoxysilane (APTES) and incorporated into polyethersulfone (PES) membranes to improve the hydrophilicity of the membranes as well as the interfacial interaction between HNTs and the polymer matrix. The intrinsic properties, permeability, and selectivity of the prepared membranes were analyzed to evaluate the membrane performance. In addition, humic acid (HA) fouling experiments were conducted to measure the antifouling properties of the fabricated membranes. As HNTs and functionalized HNTs (f-HNTs) contents are increased, hydrophilicity and mechanical strength were enhanced, and membranes with f-HNTs showed further improved performance. The pure water flux of membranes with 2% HNTs and f-HNT was 7.5 times higher than that of a pristine PES membrane without a trade-off relation between the water flux and HA rejection. The membranes with f-HNTs showed the highest antifouling properties compared to membranes with HNTs because enhanced hydrophilicity played a key role in preventing accumulation of HA.
Sung-Bae Park,Heechul Park,Jinyoung Bae,Jiyoung Lee,Ji-Hoi Kim,Mi Ran Kang,Dongsup Lee,Ji Young Park,Hee-Kyung Chang,Sunghyun Kim 대한의생명과학회 2019 Biomedical Science Letters Vol.25 No.4
Currently, molecular diagnostic assays based on nucleic acid amplification tests have been shown to effectively detect mycobacterial infections in various types of specimen, however, variable sensitivity was shown in FFPE samples according to the kind of commercial kit used. The present study therefore used automated PCR-reverse blot hybridization assay (REBA) system, REBA Myco-ID HybREAD 480®, for the rapid identification of Mycobacterium species in various types of human tissue and compared the conventional one-tube nested-PCR assay for detecting Mycobacterium tuberculosis (MTB). In conventional nested-PCR tests, 25 samples (48%) were MTB positive and 27 samples (52%) were negative. In contrast, when conducted PCR-REBA assay, 11 samples (21%) were MTB positive, 20 samples (39%) were NTM positive, 8 samples (15%) were MTB-NTM double positive, and 13 samples (25%) were negative. To determine the accuracy and reliability of the two molecular diagnostic tests, the one-tube nested-PCR and PCR-REBA assays, were compared with histopathological diagnosis in discordant samples. When conducted nested-PCR assay, 10 samples (59%) were MTB positive and seven samples (41%) were negative. In contrast, when conducted PCR-REBA test, three samples (17%) were MTB positive, 10 samples (59%) were NTM positive and four samples (24%) were negative. In conclusion, the automated PCR-REBA system proved useful to identify Mycobacterium species more rapidly and with higher sensitivity and specificity than the conventional molecular assay, one-tube nested-PCR; it might therefore be the most suitable tool for identifying Mycobacterium species in various types of human tissue for precise and accurate diagnosis of mycobacterial infection.
( Hyanglan Hyun ),( Sung-bae Park ),( Heechul Park ),( Junseong Kim ),( Yun-jeong Kang ),( Jiyoung Lee ),( Jungho Kim ),( Sunyoung Park ),( Yong Sung Lee ),( Sunghyun Kim ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Background Latent tuberculosis infection (LTBI) is characterized as a consistent immune response to Mycobacterium tuberculosis antigens without clinical evidence of active tuberculosis (ATB). Currently, LTBI use the tuberculin skin test (TST) and interferon gamma (IFN-γ) release assay (IGRA) as diagnostic Methods. However, due to the limitation of inability to distinguish ATB with LTBI, it is critical that discover indicators which for effective TB management. Therefore, we compared the expression patterns of the markers in the whole blood of the ATB, LTBI, and healthy control (HC) groups that for differential effective diagnosis and treatment. Method A total of 126 human whole blood samples were used, IGRA assay and complete blood count (CBC) analysis were used for discrimination of ATB, LTBI, and HC groups. Results The Results showed that the number of White Blood Cell (WBC) was significantly decreased (p < 0.001) in the CBC than those of the healthy control and LTBI groups. In the WBC differential count, the number of neutrophils and monocytes were increased (p < 0.001) in active TB group, whereas those of lymphocytes were significantly decreased (p < 0.01) in active TB group compared healthy control group. Results verified that the levels of total WBC, Hb, neutrophils, lymphocytes, monocytes were statistically significant (p < 0.05) and the AUC was approximately 0.8613. Conclusion based on this data indicate that the usefulness of these potential indicators for effective differential diagnosis and treatment by comparing the expression patterns of the markers in the whole blood of the ATB, LTBI, and HC groups. Acknowledgement This study was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (NRF-2020R1C1C1007169) and Brain Busan 21 plus project.
Lee, Byoung-Sun,Yoon, Jihyun,Jung, Changhoon,Kim, Dong Young,Jeon, Seung-Yeol,Kim, Ki-Hong,Park, Jun-Ho,Park, Hosang,Lee, Kang Hee,Kang, Yoon-Sok,Park, Jin-Hwan,Jung, Heechul,Yu, Woong-Ryeol,Doo, Seok American Chemical Society 2016 ACS NANO Vol.10 No.2
<P>We report on the synergetic effects of silicon (Si) and BaTiO3 (BTO) for applications as the anode of Li-ion batteries. The large expansion of Si during lithiation was exploited as an energy source via piezoelectric BTO nanoparticles. Si and BTO nanoparticles were dispersed in a matrix consisting of multiwalled carbon nanotubes (CNTs) using a high-energy ball-milling process. The mechanical stress resulting from the expansion of Si was transferred via the CNT matrix to the BTO, which can be poled, so that a piezoelectric potential is generated. We found that this local piezoelectric potential can improve the electrochemical performance of the Si/CNT/BTO nanocomposite anodes. Experimental measurements and simulation results support the increased mobility of Li-ions due to the local piezoelectric potential.</P>
Performance of an Anode Supported Solid Oxide Fuel Cell with Indirect Internal Reforming
Park, Sungtae,Zou, Jing,Yoon, Heechul,Sammes, Nigel Mark,Chung, Jong Shik The Electrochemical Society 2013 ECS Transactions Vol.57 No.1
<P>The conversion of fuel into hydrogen-rich gas is necessary for fuel cells. This can be achieved either indirectly in fuel processing systems, in which the hydrocarbon feed is converted in an external catalytic steam reformer, or directly in the fuel cell. In this paper, the unit module of solid oxide fuel cell was assembled by one reformer and four cells. The reformer was fabricated by extruded dummy cell and combined with two cells on each side respectively. The reforming catalyst was coated on internal channel of the dummy cell. The unit module has successfully tested with wet CH<SUB>4</SUB> as fuel and air as oxidant and its maximum power density exceeded 150 mW/cm<SUP>2</SUP> at 750 ºC.</P>