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Charge transfer in graphene/polymer interfaces for CO2 detection

Nano Research 2018年第7期11卷 3529-3536页

作者： Myungwoo Son Yusin Pak Sang-Soo Chee Francis Malar Auxilia Kihyeun Kim Byung-Kee lee sungeun lee Sun Kil Kang Chaedeok lee Jeong Soo lee Ki Kang Kim Yun Hee Jang Byoung Hun lee Gun-Young Jung Moon-Ho Ham School of Materials Science and Engineering Research Institute for Solar and Sustainable Energies Gwangju Institute of Science & Technology 723 Cheomdangwagi-ro Buk-gu Gwangju 61005 Republic of Korea Materials & Devices Advanced Research Institute LG Electronics Woomyeon R&D Campus 38 Baumoe-ro Seocho-gu Seoul 06763 Republic of Korea Department of Energy and Materials Engineering Dongguk University Seoul 04620 Republic of Korea Energy Systems Engineering Daegu Gyeongbuk Institute of Science & Technology 333 Technojungang-daero Hyeonpung-myeon Dalseong-gun Daegu 42988 Republic of Korea

Understanding charge transfer processes between graphene and functional materials is crucial from the perspectives of fundamental sciences and potential applications, including electronic devices, photonic devices, and sensors. In this study, we present the charge transfer behavior of graphene and amine-rich polyethyleneimine （PEI） upon CO2 exposure, which was significantly improved after introduction of hygroscopic polyethylene glycol （PEG） in humid air. By blending PEI and PEG, the number of protonated amine groups in PEI was remarkably increased in the presence of water molecules, leading to a strong electron doping effect on graphene. The presence of CO2 gas resulted in a large change in the resistance of PEI/PEG-co-functionalized graphene because of the dramatic reduction of said doping effect, reaching a maximum sensitivity of 32% at 5,000 ppm CO2 and an applied bias of 0.1 V in air with 60% relative humidity at room temperature. This charge transfer correlation will facilitate the development of portable graphene-based sensors for real-time gas detection and the extension of the applications of graphene-based electronic and photonic devices.

关键词： graphene polyethyleneimine (PEI) polyethylene glycol carbon dioxide charge transfer

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Asymptotic T_u-Toeplitzness of weighted composition operators on H^2

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Science China Mathematics 2018年第5期61卷 881-896页

作者： sungeun Jung Department of Mathematics Hankuk University of Foreign Studies

Given a unilateral forward shift S acting on a complex,separable,infinite dimensional Hilbert space H,an asymptotically S-Toeplitz operator is a bounded linear operator T on H satisfying that{S^(*n)T S^n}is convergent with respect to one of the topologies commonly used in the algebra of bounded linear operators on *** this paper,we study the asymptotic T_u-Toeplitzness of weighted composition operators on the Hardy space H^2,where u is a nonconstant inner function.

关键词： Toeplitz operator asymptotically S-Toeplitz operator weighted composition operator inner function

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Tc-99m ciprofloxacin imaging in diagnosis of chronic bacterial prostatitis

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Asian Journal of Andrology 2003年第3期5卷 179-183页

作者： Ji-Kan Ryu Seong-Min lee Do-Whan Seong Jun-Kyu Suh sungeun Kim Wonsick Choe Yeonsook Moon Soo-Hwan Pai Department of Urology Inha University School of MedicineJncheon 400103Korea Department of Nuclear Medicine Inha University School of MedicineIncheon 400103Korea Department of Clinical Patholgy Inha University School of MedicineJncheon 400103Korea

Aim: To investigate the value of Tc-99m ciprofloxacin imaging in the differential diagnosis of chronic bacterial prostatitis. Methods: The study included 4 normal subjects as the negative controls, 2 patients with acute prostatitis or cystourethritis as the positive controls and 59 patients diagnosed as chronic bacterial prostatitis or chronic pelvic pain syndrome by traditional laboratory tests. In every subject, the single photon emission computerized tomography images were obtained 3 h after intravenous injection of Tc-99m Ciprofloxacin. The results of the imaging were compared with those of laboratory tests. Results: On the images, negative uptake was observed in all normal subjects, while strong hot uptake, in the whole prostate of acute prostatitis patients and in the whole urethra of acute cystourethritis patients. In 13 (68 %) of 19 patients categorized as chronic bacterial prostatitis by standard laboratory tests, hot uptake with less intensity than that of acute prostatitis was observed in the prostate area around the prostatic urethra. Negative uptake in the prostate was observed in 6 of 19 patients (32 %) categorized as chronic bacterial prostatitis. Interestingly, hot uptake in the prostate was exhibited in 28 (70 %) of the 40 patients categorized as chronic pelvic pain syndrome. Conclusion: Tc-99m ciprofloxacin imaging is helpful in the differential diagnosis of prostatitis syndrome.

关键词： prostate prostatitis pelvic pain syndrome urinary tract infections radioisotope diagnostic techniques

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Nutritious mushroom protein crisp–healthy alternative to starchy snack

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Food Production, Processing and Nutrition 2021年第1期3卷 416-430页

作者： Venkatesh Balan Dianne Novak William Knudson ADaniel Jones Fabiola Maria Iñiguez-Franco Rafael Auras sungeun Cho Am a Rodgers Bryan Ubanwa Department of Engineering Technology Biotechnology ProgramCollege of TechnologyUniversity of HoustonTX 77479 Sugar LandUSA Product Center Michigan State UniversityEast LansingMI 48824USA Department of Biochemistry and Molecular Biology Michigan State UniversityEast LansingMI 48824USA School of Packaging College of Agriculture&Natural ResourcesMichigan State UniversityEast LansingMI 48824USA Department of Poultry Science Auburn UniversityAuburnAL 36849USA

Global salty snacks category had reached USD 137 billion in sales in *** to growing health concerns and awareness,consumers are looking for healthy snack choices by avoiding ingredients such as fat,sugar,cholesterol,and sodium and selecting baked and salt free multigrain chips.A sizable number of consumers are concerned about snack nutrition and look for quality ingredients and minimally processed foods called as“Good Health Snack(GHS)”.In this work,we present the development of method of producing and testing mushrooms protein crisps(MPC),a healthy alternative to conventional starchy snacks that are rich in protein,nutraceutical compounds,minerals,vitamin,dietary fiber,and immunity inducing *** methods of producing MPC with different seasoning and hydrolyzed protein,calorie,nutritional and chemical composition,consumer response,shelf life after packing and market analysis are *** systematic studies will help to market potential of this product which is a healthy alternative to other calorie rich snacks sold in the market benefiting the consumers.

关键词： Healthy diet Mushroom Starch Obesity Diabetes Cholesterol

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Anti-inflammatory activity of ginsenosides in LPS-stimulated RAW 264.7 cells

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Science Bulletin 2015年第8期60卷 773-784,M0003页

作者： sungeun Ahn Muhammad Hanif Siddiqi Hae-Yong Noh Yu-Jin Kim Yeon-Ju Kim Chi-Gyu Jin Deok-Chun Yang Ginseng Genetic Bank Graduate School of BiotechnologyCollege of Life Science Kyung Hee University

Ginsenosides, the main active constituents of Panax ginseng Meyer （P. ginseng）, have potential therapeutic effects. All tested ginsenosides except gin- senoside F1 have previously been reported in inflammation studies using the RAW 264.7 macrophage cell line. We ex- amined the anti-inflammatory effects of single sugar moiety ginsenosides such as compound K （CK）, Rh2, Rhl, and F1 that were isolated from P. ginseng through in silico docking studies. We investigated their biological activity predictions, including absorption, distribution, metabolism, excretion, and toxicity and PASS properties, on the suppression of NF- κB, followed by in vitro validation in lipopolysaccharide （LPS）-stimulated RAW 264.7 macrophage cells. The molecular docking results of our study showed that all treated ginsenosides are non-toxic and may be drug-like molecules. The molecular binding interactions of these ginsenosides with the active residues of NF-κB noticeably support their anti-inflammatory activity. CK and Rhl sig- nificantly reduced the production of nitric oxide, cyclooxy- genase-2 （COX-2）, and pro-inflammatory cytokines such as prostaglandin E2 and tumor necrosis factor alpha （TNF-α） in a dose-dependent manner. Real-time PCR and Western blot analyses further confirmed that protopanaxadiols （PPDs） and protopanaxatriols （PPTs） inhibitory effects may have been due to the down-regulation of TNF-α, inducible nitric oxide synthase, COX2, nuclear factor kappa B （NF-κB）, and I kappa B kinase. The expression of co-stimulatory molecules such as ROS was also inhibited by CK and Rhl in a dose- dependent manner. Furthermore, activation of NF-κB in LPS-stimulated RAW 264.7 macrophages was significantly suppressed by CK and Rhl. Taken together, these results provide evidence that PPD- and PPT-type ginsenosides in- cluding CK and Rhl may exhibit strong anti-inflammatory effects by inhibiting pro-inflammatory mediators through down-regulation of NF-κB.

关键词： Ginsenosides Protopanaxadiol Protopanaxatriol Inflammation NF-κB/IKK RAW 264.7

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对“自相似性”的艺术创作实践报告

对“自相似性”的艺术创作实践报告

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作者：郑圣恩（sungeun Chung）上海大学

学位级别：硕士

本论文通过作品创作中对自相似性语言的运用表达,在分形理论的背景与定义中找到与自身创作的契合点,完成研究生阶段的创作研究。自相似性是现代分形理论中最明显的一个特征。虽然分形理论是现代理论,但从自然缘起,与陶瓷一样,这种实际... 详细信息

本论文通过作品创作中对自相似性语言的运用表达,在分形理论的背景与定义中找到与自身创作的契合点,完成研究生阶段的创作研究。自相似性是现代分形理论中最明显的一个特征。虽然分形理论是现代理论,但从自然缘起,与陶瓷一样,这种实际上早于人类文明的成形现象在现代艺术中得到非常多的应用与体现,并为在科技与理性主导的现代工业社会的美学困境中提供了一种有效的出路。本论文致力于通过创作实践,对分形理论研究和陶瓷创作结合,观察自相似性的应用方式,把从对自相似性研究中得到的丰富理论,包括对分形理论中不同的理论方法和不同艺术家创作的作品分析,结合创作过程中对陶瓷材料和创作过程的记录,用开放的创作方式进行这种理论结合实践的创作行为。事实上这种通过把具体现象抽象化研究和创作结合的方法也同时提升了我对现象、事物存在更深刻洞察力和表达的可能性,而且对‘自相似性’的研究在创作中所体现的通过部分看整体,整体中发现部分的方式,也影响了我在创作过程中,对反复行为的重视,并把这种方式进入到作品架构中,完成对‘自相似性’艺术形态的实践研究。

关键词：自相似性分形理论陶瓷跨学科研究

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A case of a duodenal duplication cyst presenting as melena

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World Journal of Gastroenterology 2013年第38期19卷 6490-6493页

作者： Seung Yeon Ko Sun Hye Ko sungeun Ha Mi Sung Kim Hyang Mi Shin Myong Ki Baeg Department of General Surgery College of MedicineThe Catholic University of Korea Department of Internal Medicine College of MedicineThe Catholic University of Korea Department of Pathology College of MedicineThe Catholic University of Korea

Duodenal duplication cysts are benign rare congenital anomalies reported mainly in the pediatric population,but seldom in *** depend on the type and location and can present as abdominal pain,distension,dysphagia or *** have been reported to be responsible for duodenal obstruction,pancreatitis and,in rare cases,gastrointestinal *** present a case of a duodenal duplication cyst in a 43-year-old man presenting as *** gastroduodenoscopy and colonoscopy did not reveal any bleeding ***,the patient began passing melena after 3 d,with an acute decrease in hemoglobin *** studies revealed a duplication cyst in the second portion of the duodenum which was surgically *** revealed a duodenal duplication cyst consisting of intestinal *** was no further bleeding and the patient recovered *** rare cases,duodenal duplication cysts might cause gastrointestinal bleeding and should be included in the differential diagnosis.

关键词： Gastrointestinal hemorrhage Duodenum Duplication

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