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Kim, Yeon Joo,Kim, Jong Hoon,Yu, Chang Sik,Kim, Tae Won,Jang, Se Jin,Choi, Eun Kyung,Kim, Jin Cheon,Choi, Wonsik The Korean Society for Radiation Oncology 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: The concentration of capecitabine peaks at 1-2 hours after administration. We therefore assumed that proper timing of capecitabine administration and radiotherapy would maximize radiosensitization and influence survival among patients with locally advanced rectal cancer. Materials and Methods: We retrospectively reviewed 223 patients with locally advanced rectal cancer who underwent preoperative chemoradiation, followed by surgery from January 2002 to May 2006. All patients underwent pelvic radiotherapy (50 Gy/25 fractions) and received capecitabine twice daily at 12-hour intervals ($1,650mg/m^2/day$). Patients were divided into two groups according to the time interval between capecitabine intake and radiotherapy. Patients who took capecitabine 1 hour before radiotherapy were classified as Group A (n = 109); all others were classified as Group B (n = 114). Results: The median follow-up period was 72 months (range, 7 to 149 months). Although Group A had a significantly higher rate of good responses (44% vs. 25%; p = 0.005), the 5-year local recurrence-free survival rates of 93% in Group A and 97% in Group B did not differ significantly (p = 0.519). The 5-year disease-free survival and overall survival rates were also comparable between the groups. Conclusions: Despite the better pathological response in Group A, the time interval between capecitabine and radiotherapy administration did not have a significant effect on survivals. Further evaluations are needed to clarify the interaction of these treatment modalities.
Imaging the Completely Buried Anomaly using a Small-ship Three-dimensional Seismic Survey System
Kim, Wonsik,Shin, Jungkyun,Kim, Hyundo,Yi, Bo-Yeon,Park, Chanho,Kim, Chansu,Seo, Gabseok,Cho, Dongwoo,Jung, Yonghwa,Lee, Ho-Young,Kang, Dong-Hyo BioOne (Coastal Education and Research Foundation) 2018 JOURNAL OF COASTAL RESEARCH Vol.85 No.special
Light-induced electrical switch <i>via</i> photo-responsive nanocomposite film
Lee, Wonsik,Kim, Dongjun,Lim, Joonyoung,Kim, Geonho,Kim, Ikyon,Kim, Songkuk,Kim, Jiwon Elsevier 2018 Sensors and actuators. B Chemical Vol.266 No.-
<P><B>Abstract</B></P> <P>Photo-responsive nanomaterials have attracted a lot of attention since they allow a remote control with a non-invasive stimulus—light. Owing to this property, it has been applied to next-generation electrical devices, which are desired to be flexible and transparent for a wider range of applications. Herein, we developed a flexible, transparent and conductive film which can change its shape <I>via</I> light of specific wavelength to control the electrical conductivity between electrodes. The film is composed of three layers: azobenzene incorporated poly(dimethylsiloxane), AzoPDMS; silk fibroin; and silver nanowires, AgNWs. When azobenzene within the polymer changes its molecular arrangement upon irradiation, the difference in volume changes of AzoPDMS and silk fibroin layer results in the film to bend. Since a silk fibroin layer folds inward upon irradiation, AgNWs are coated onto the silk fibroin layer to be selectively in contact with the electrodes. This photo-responsive nanocomposite film is flexible, transparent and conductive which can be connected to the circuit on demand <I>via</I> light acting as an electrical switch. We believe it can be combined with various transparent electronic devices to further expand its applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A flexible, transparent and conductive photo-bending film was fabricated. </LI> <LI> The photo-responsive film consists of photo-responsive/support/conductive layers. </LI> <LI> The film could bend up to 90° with switching time of a few seconds upon irradiation. </LI> <LI> The conductivity of film can be optimized by changing the concentration of silver nanowires. </LI> <LI> The film can be connected to the circuit on demand acting as a light-induced electrical switch. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
KoFlux: A New Tool to Study the Biosphere-Atmosphere Interactions in Asia
Joon Kim,Wonsik Kim,Byong-lyol Lee,Ki-hyun Kim,Kyu-rang Kim,Min-young Kim,Bang-yong Lee,Do-won Lee,Gang-woong Lee,Jeong-taek Lee,Jong-hwan Lim,Jai-ho Oh,Eun-woo Park,Jae-seol Shim,Jin-il Yun,Chae-shik 한국기상학회 2002 대기 Vol.12 No.1
Yeon Joo Kim,Jong Hoon Kim,Chang Sik Yu,Tae Won Kim,Se Jin Jang,Eun Kyung Choi,Jin Cheon Kim,Wonsik Choi 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: The concentration of capecitabine peaks at 1–2 hours after administration. We therefore assumed that proper timing of capecitabine administration and radiotherapy would maximize radiosensitization and influence survival among patients with locally advanced rectal cancer. Materials and Methods: We retrospectively reviewed 223 patients with locally advanced rectal cancer who underwent preoperative chemoradiation, followed by surgery from January 2002 to May 2006. All patients underwent pelvic radiotherapy (50 Gy/25 fractions) and received capecitabine twice daily at 12-hour intervals (1,650 mg/m 2 /day). Patients were divided into two groups according to the time interval between capecitabine intake and radiotherapy. Patients who took capecitabine 1 hour before radiotherapy were classified as Group A (n = 109); all others were classified as Group B (n = 114). Results: The median follow-up period was 72 months (range, 7 to 149 months). Although Group A had a significantly higher rate of good responses (44% vs. 25%; p = 0.005), the 5-year local recurrence-free survival rates of 93% in Group A and 97% in Group B did not differ significantly (p = 0.519). The 5-year disease-free survival and overall survival rates were also comparable between the groups. Conclusions: Despite the better pathological response in Group A, the time interval between capecitabine and radiotherapy administration did not have a significant effect on survivals. Further evaluations are needed to clarify the interaction of these treatment modalities.
Wonsik Kim,Seungsun Choi,Woojin Shin,Jaewon Oh,Mee-Yi Ryu,Hyunbok Lee 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.1
Ultraviolet-ozone (UVO) treatment modifies the surface properties of film for use in thin-film optoelectronics. In particular, the hydrophobic nature of the surface of organic films can be changed to a hydrophilic nature, thereby enabling a multilayer structure using a solution process. However, the electronic structure of organic films with UVO treatment has not been investigated in detail. In this study, the changes in the electronic structure of tetra-tert-butyl copper phthalocyanine (ttb-CuPc) films by UVO treatment were explored using UV-vis absorption spectroscopy and X-ray photoelectron spectroscopy (XPS). The ttb-CuPc film was fabricated by spin coating, and various UVO treatment times were applied. As the UVO treatment time increased, the absorption intensity of the ttb-CuPc films exponentially decayed. In the XPS spectra, the oxidation process was observed in two stages (macrocyclic isoindole units followed by peripheral ttb units). Upon oxidation, while the C and N atoms in the ligands exhibited an electron-donating characteristic, the central Cu atom showed an electron-withdrawing nature. Such an altered charge distribution on the ttb-CuPc molecule can significantly influence charge transport in optoelectronic devices.
Effects of stirring temperature of P3HT:PCBM solution on device performance of organic photovoltaics
Kim Wonsik,Choi Seungsun,Shin Woojin,Oh Jaewon,Ryu Mee-Yi,이현복 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2
In organic photovoltaics (OPVs), bulk heterojunction (BHJ) is an efcient strategy to enhance their power conversion efciency (PCE) by increasing the interface area between donor and acceptor materials. For the formation of favorable donor– acceptor networks, various conditions in fabricating a BHJ flm should be optimized. In this study, the efects of the stirring temperature of a poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) solution on the OPV performance were investigated. High uniformity was attained in the BHJ flm fabricated using a solution stirred at 80 °C. However, in the BHJ flm fabricated using a solution stirred at room temperature (RT), large PCBM aggregates were formed. Such PCBM aggregates deteriorated both the ordering of P3HT chains and the networks of P3HT and PCBM. Consequently, the PCE of the OPV was considerably decreased with the use of a P3HT:PCBM solution stirred at RT. Thus, sufciently high stirring temperatures in preparing a P3HT:PCBM solution are essential to achieving efcient BHJ OPVs.
Kim, Yeongmin,Jeong, Hae Jun,Kim, Wonsik,Chun, Wongee,Han, Hyun Joo,Lim, Sang Hoon Elsevier 2017 ENERGY Vol.137 No.-
<P><B>Abstract</B></P> <P>This study introduces the experimental work done to analyze the performance of active daylighting systems, which consist of small individually operated solar concentrators. Each system is capable of precise solar tracking thanks to the double axis solar tracker designed and constructed for lightness and easy operation. A solar tracking algorithm was implemented with AVR based on both closed and open loop control algorithms. Two different types of solar concentrators (developed for the system) were tested to assess their photometric characteristics in collecting and delivering solar rays to a deep plan office space for better lighting. To measure illuminance at different times of the day, a number of photo sensors were installed on the task planes at a height of 85 cm above the floor. The luminance values on different walls (including task planes) were also measured at a regular interval of 30 min to assess their variation with time and solar altitude. These photometric data enabled a systematic performance evaluation of the systems employed in the present study. The experimental results demonstrated the applicability of the daylighting systems employed in this work in bringing natural daylight to the interior, especially, to those spaces too deep for conventional daylighting apertures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two different types of solar concentrators are compared for daylighting performance. </LI> <LI> A series of measurements were performed side by side for an actual office space. </LI> <LI> Some practical suggestions are made when using a daylighting system in view of energy efficiency. </LI> <LI> Results are introduced leading to an innovative fiber optic system to harvest daylight in buildings. </LI> </UL> </P>