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Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

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Journal of Energy Chemistry 2021年第3期30卷 208-216页

作者： Min-Woo lee Jae-Yup Kim hyung-geun lee Hyun Gil Cha Duck-hyung lee Min Jae Ko Bio-Based Chemistry Research Center Advanced Convergent Chemistry DivisionKorea Research Institute of Chemical Technology(KRICT)Ulsan 44429Republic of Korea Department of Chemical Engineering Dankook UniversityYongin 16890Republic of Korea Department of Chemistry Sogang UniversitySeoul 04107Republic of Korea Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul 04763Republic of Korea

Herein,we examine the performance of dye-sensitized solar cells containing five D-π-A organic dyes designed by systematic modification of π-bridge size and geometric *** dye has a simple push-pull structure with a triarylamino group as an electron donor,bithiophene-4,4-dimethyl-4 H-cyclopenta 1,2-b:5,4-b’]dithiophene(M11),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophenethiophene(M12),thiophene-4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M13),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene-benzene(M14),and 4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M15)units asπ-bridges,and cyanoacrylic acid as an electron acceptor/*** extension of theπ-bridge linkage favors wide-range absorption but,because of the concomitant molecular volume increase,hinders the efficient adsorption of dyes on the TiO_(2) film ***,higher loadings are achieved for smaller dye molecules,resulting in(i)a shift of the TiO_(2) conduction band edge to more negative values,(ii)a greater photocurrent,and(iii)suppressed charge recombination between the photoanode and the redox couple in the ***,under one-sun equivalent illumination(AM 1.5 G,100 mW/cm^(2)),the highest photovoltage,photocurrent,and conversion efficiency(η=7.19%)are observed for M15,which has the smallest molecular volume among M series dyes.

关键词： Dye-sensitized solar cells Donor-acceptor dyes Electron-rich unit Wide-range absorption Impedance spectroscopy

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Management of bleeding from pseudoaneurysms following pancreaticoduodenectomy

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World Journal of Gastroenterology 2010年第10期16卷 1239-1244页

作者： hyung geun lee Jin Seok Heo Seong Ho Choi Dong Wook Choi Department of Surgery Samsung Medical CenterSungkyunkwan University School of Medicine

AIM:To review the clinical course and the management of pseudoaneurysms ***: Medical records of 907 patients who underwent pancreaticoduodenectomies from January 1995 to May 2007 were evaluated retrospectively. The clinical course, management strategy, and outcome of ruptured pseudoaneurysms cases were ***: Twenty-seven (3.0%) of 907 cases had post-operative hemorrhage from ruptured pseudoan-eurysms. Pancreatic fistula was evident in 12 (44%) cases. Sentinel ble...

关键词： Pseudoaneurysm Angi-ography Embolization Stent graft

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Carcinoma of the middle bile duct:Is bile duct segmental resection appropriate?

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World Journal of Gastroenterology 2009年第47期15卷 5966-5971页

作者： hyung geun lee Sang Hoon lee Dong Do Yoo Kwang Yeol Paik Jin Seok Heo Seong Ho Choi Dong Wook Choi Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135-710South Korea

AIM:To compare survival between bile duct segmental resection(BDSR)and pancreaticoduodenectomy(PD) for treating distal bile duct cancers. METHODS:Retrospective analysis was conducted for 45 patients in a BDSR group and for 149 patients in a PD group. RESULTS:The T-stage(P<0.001),lymph node invasion (P=0.010)and tumor differentiation(P=0.005)were significant prognostic factors in the BDSR *** 3-and 5-year overall survival rates for the BDSR group and PD group were 51.7%and 36.6%,respectively and 46.0%and 38.1%,respectively(P=0.099).The BDSR group and PD group did not show any significant difference in survival when this was adjusted for the TNM *** 3-and 5-year survival rates were: stageⅠa[BDSR(100.0%and 100.0%)vs PD(76.9% and 68.4%)(P=0.226)];stageⅠb[BDSR(55.8% and 32.6%)vs PD(59.3%and 59.3%)(P=0.942)]; stageⅡb[BDSR(19.2%and 19.2%)vs PD(31.9%and 14.2%)(P=0.669)]. CONCLUSION:BDSR can be justified as an alternative radical operation for patients with middle bile duct inselected patients with no adjacent organ invasion and resection margin is negative.

关键词： Bile duct cancer Segmental resection Pancreaticoduodenectomy

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Development of single-action,two-step clinching system using finite element analysis

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中国有色金属学会会刊：英文版 2009年第B9期19卷 266-270页

作者： Seong-Wook lee Tae-hyung KIM geun-Jo HAN Power & Industrial Systems R&D Center Hyosung Corporation Department of Mechanical Engineering Department of Mechanical Engineering Dong-A University

Traditional manufacturing processes for bending and combining the upper and lower heat insulation plates for a car catalytic converter need two kinds of bending dies. This study was carried out to develop a single-action, two-step clinching system for clinching heat insulation plates. To design the operating mechanism for this clinching system, finite element analysis was used to estimate the bending load needed and to predict the bent shape of the heat insulation plate. Then a recovery and cushioning system was designed for the bending die. It is expected that this new process will improve the manufacturing quality of heat insulation plates and will reduce manufacturing cost. And a higher value-added technique for mold and pressing systems was introduced.

关键词：缓冲系统有限元分析开发汽车催化转化器单动模具技术隔热板板弯曲

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Distribution of electric field for carbon nanotube assembly: Simulation (I)

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 117-120页

作者： Soon-geun KWON Soo-Hyun KIM Kwang-Ho KIM Myung-Chang KANG hyung-Woo lee Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

The distribution of electric field for the alignment and attachment of carbon nanotubes (CNTs) was simulated. To be attached at the desired place, the aligned and attracted CNTs should be stayed in the desired area called the stable region or the quasi-stable region for an instant where the change of electric field is minimized. Since the conical electrode has the very narrow sized quasi-stable region, few CNTs can be attached. The rectangular electrodes have a wide stable region, so lots of CNTs can be attached. The results indicate that the round electrode which has a proper sized quasi-stable region is more effective for aligning and attaching a single CNT than the conical or rectangular shaped electrodes.

关键词： carbon nanotubes (CNTs) dielectrophoresis (DEP) round shaped electrode simulation

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Microfluidic dual loops reactor for conducting a multistep reaction

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Frontiers of Chemical Science and Engineering 2018年第2期12卷 239-246页

作者： Si hyung Jin Jae-Hoon Jung Seong-geun Jeong Jongmin Kim Tae Jung Park Chang-Soo lee Department of Chemical Engineering Chungnam National University Daejeon 34134 Korea Lotte Chemical R&D Center Daejeon 34110 Korea Department of Chemistry Chung-Ang University Seoul 06974 Korea

Precise control of each individual reaction that constitutes a multistep reaction must be performed to obtain the desired reaction product efficiently. In this work, we present a microfluidic dual loops reactor that enables multistep reaction by integrating two identical loop reactors. Specifically, reactants A and B are synthesized in the first loop reactor and transferred to the second loop reactor to synthesize with reactant C to form the final product. These individual reactions have nano-liter volumes and are carded out in a stepwise manner in each reactor without any cross-contamination issue. To pre- cisely control the mixing efficiency in each loop reactor, we investigate the operating pressure and the operating frequency on the mixing valves for rotary mixing. This microfluidic dual loops reactor is integrated with several valves to realize the fully automated unit operation of a multistep reaction, such as metering the reactants, rotary mixing, transportation, and collecting the product. For proof of concept, CdSeZn nanopartieles are successfully synthesized in a microfluidic dual loops reactor through a fully automated mukistep reaction. Taking all of these features together, this microfluidic dual loops reactor is a general microfluidic screening platform that can synthesize various materials through a multistep reaction.

关键词： microfluidics multistep reaction rotary mixing nanoparticle

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Flexible thermocells for utilization of body heat

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Nano Research 2014年第4期7卷 443-452页

作者： Hyeongwook Im hyung geun Moon Jeong Seok lee In Young Chung Tae June Kang Yong Hyup Kim School of Mechanical and Aerospace Engineering Seoul National University Seoul 151-742 Republic of Korea Department of Electronics and Communications Engineering Kwangwook University Seou1139-701 Republic of Korea Department of Nanofusion Technology Pusan National University Busan 609-735 Republic of Korea

Plastic thermo-electrochemical ceils （thermocells） involving aqueous potassium ferricyanide/ferrocyanide electrolyte have been investigated as an alternative to conventional thermoelectrics for thermal energy harvesting. Plastic thermocells that consist of all pliable materials such as polyethylene terephthalate （PET）, fabrics, and wires are flexible enough to be wearable on the human body and to be wrapped around cylindrical shapes. The performance of the thermocells is enhanced by incorporating carbon nanotubes into activated carbon textiles, due to improved charge transfer at the interface. In cold weather conditions （a surrounding temperature of 5 ℃）, the thermocell generates a short-circuit current density of 0.39 A/m2 and maximum power density of 0.46 mW/m2 from body heat （temperature of 36℃）. For practical use, we have shown that the thermocell charges up a capacitor when worn on a T-shirt by a person. We also have demonstrated that the electrical energy generated from waste pipe heat using a serial array of the thermocells and voltage converters can power a typical commercial light emitting diode （LED）.

关键词： wearable thermocell body heat waste heat recovery carbon nanotubes activated carbon textile porous electrode

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Clinical implications of neutrophil-to-lymphocyte ratio and MDSC kinetics in gastric cancer patients treated with ramucirumab plus paclitaxel

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Chinese Journal of Cancer Research 2020年第5期32卷 621-630页

作者： hyung-Don Kim Min-Hee Ryu Sangsoon Yoon Young-Soon Na Meesun Moon hyungeun lee hyung geun Song Yoon-Koo Kang Department of Oncology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Republic of Korea Asan Institute for Life Science Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Republic of Korea DiNonA Inc Seoul 05505Korea

Objective: We aimed to investigate the prognostic value of neutrophil-to-lymphocyte ratio(NLR) and myeloidderived suppressor cells(MDSCs) in gastric cancer patients treated with second-line ramucirumab plus ***: A total of 116 patients with advanced or metastatic gastric cancer who receive ramucirumab plus paclitaxel were prospectively enrolled. Fresh blood samples were collected before and after treatment, and flow cytometry was performed to assess the proportions of monocytic(m MDSCs) and granulocytic MDSCs(g MDSCs).Results: Median age was 58 years and 71(61.2%) patients were male. A baseline NLR≥2.94 was associated with significantly poorer progression-free survival(PFS) and overall survival(OS) vs. an NLR<2.94(P=0.011 and P=0.002, respectively). In multivariate analysis, an NLR≥2.94 was independently associated with poorer PFS[hazard ratio(HR)=1.58;95% confidence interval(95% CI): 1.01-2.49, P=0.046] and OS(HR=1.77;95% CI:1.04-3.04, P=0.036). While m MDSC counts did not significantly change following two cycles of therapy(P=0.530),g MDSC counts decreased significantly after two treatment cycles(P=0.025) but tended to increase in patients with progressive disease after two treatment cycles(P=0.098). A progressive increase in g MDSC counts(≥44%) was associated with a significantly shorter PFS and OS vs. a g MDSC count increase <44%(P=0.001 and P=0.003,respectively).Conclusions: The baseline NLR may help guide clinical decisions during ramucirumab plus paclitaxel therapy for gastric cancer. Our g MDSC kinetics data warrant further clinical validation and mechanistic investigation.

关键词： Gastric cancer ramucirumab plus paclitaxel neutrophil-to-lymphocyte ratio myeloid-derived suppressor cells

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Real-time electrical detection of epidermal skin MoS2 biosensor for point-of-care diagnostics

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Nano Research 2017年第3期10卷 767-775页

作者： Geonwook Yoo Heekyeong Park Minjung Kim Won geun Song Seokhwan Jeong Min hyung Kim hyungbeen lee Sang Woo lee Young KiHong Min Goo lee Sungho lee Sunkook Kim School of Electronic Engineering Soongsil University Seou106978 Republic of Korea Multi-Functional Nano/Bio Electronics Lab. Kyung Hee University Gyeonggi 17104 Republic of Korea Department of Biomedical Engineering Yonsei University Wonju 26493 Republic of Korea Korea Electronics Technology Institute Gyeonggi 13488 Republic of Korea

Various approaches have been proposed for point-of-care diagnostics, and in particular, optical detection is preferred because it is relatively simple and fast. At the same time, field-effect transistor （FET）-based biosensors have attracted great attention because they can provide highly sensitive and label-free detection. In this work we present highly sensitive, epidermal skin-type point-of-care devices with system-level integration of flexible MOS2 FET biosensors, read-out circuits, and light-emitting diode （LEDs） that enable real-time detection of prostate cancer antigens （PSA）. Regardless of the physical forms or mechanical stress conditions, our proposed high-performance MoS2 biosensors can detect a PSA concentration of 1 ***-1 without specific surface treatment for anti-PSA immobilization on the MoS2 surface on which we characterize and confirm physisorption of anti-PSA using Kelvin probe force microscopy （KPFM） and tapping-mode atomic force microscopy （tm-AFM）. Furthermore, current modulation induced by the binding process was stably maintained for longer than 2-3 min. The results indicate that flexible MoS2-based FET biosensors have great potential for point-of-care diagnostics for prostate cancer as well as other biomarkers.

关键词： epidermal skin biomarker MoS2 biosensor real-time point-of-care diagnostics

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Is endoscopic submucosal dissection safe for papillary adenocarcinoma of the stomach?

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World Journal of Gastroenterology 2015年第13期21卷 3944-3952页

作者： Hyun Jeong lee Gwang Ha Kim Do Youn Park Bong Eun lee Hye Kyung Jeon Joon hyung Jhi geun Am Song Department of Internal Medicine Pusan National University School of Medicine and Biomedical Research Institute Pusan National University Hospital Busan 602-739South Korea Department of Pathology Pusan National University School of MedicineBusan 602-739South Korea

AIM: To identify the clinicopathological predictors of lymph node(LN) metastasis and evaluate the outcomes of endoscopic submucosal dissection(ESD) in papillary adenocarcinoma-type early gastric cancers(EGCs).METHODS: From January 2005 to May 2013, 49 patients who underwent surgical operation and 24 patients who underwent ESD for papillary adenocarcinomatype EGC were enrolled to identify clinicopathological characteristics and predictive factors of LN metastasis and to evaluate the outcomes of ESD for papillary adenocarcinoma-type ***: Most papillary adenocarcinoma-type EGCs were located in the lower third of the stomach and had an elevated macroscopic shape. The overall prevalence of LN metastasis was 18.3%(9/49). The presence of lymphovascular invasion was found to be a predictor of LN metastasis(P = 0.016). According to current indication criteria of ESD, 6 and 11 of the 49 patients had absolute and expanded indications for ESD, respectively. Two patients(11.8%) with expanded indication for ESD had LN metastasis. Of the 24 patients who underwent ESD, 13(54%) achieved out-of-ESD indication, with 9 of those 13 patients undergoing surgical operation due to non-curative resection. CONCLUSION: The use of ESD should be carefully considered for papillary adenocarcinoma-type EGC with suspected ESD indication after pre-treatment work-up because of the higher frequency of LN metastasis and additional surgeries.

关键词： Gastric cancer Papillary adenocarcinoma Endoscopic

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