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A Structural Topic Model for Exploring User Satisfaction with Mobile Payments

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Computers, Materials & Continua 2022年第11期73卷 3815-3826页

作者： jang Hyun kim Jisung jang yonghwan kim Dongyan Nan Department of Human-Artificial Intelligence Interaction Sungkyunkwan UniversitySeoul03063Korea Department of Interaction Science Sungkyunkwan UniversitySeoul03063Korea Department of Applied Artificial Intelligence Sungkyunkwan UniversitySeoul03063Korea NAVER Green Factory Seongnam13561Korea

This study explored user satisfaction with mobile payments by applying a novel structural topic ***,we collected 17,927 online reviews of a specific mobile payment(i.e.,PayPal).Then,we employed a structural topic model to investigate the relationship between the attributes extracted from online reviews and user satisfaction with mobile ***,we discovered that“lack of reliability”and“poor customer service”tend to appear in negative ***,the terms“convenience,”“user-friendly interface,”“simple process,”and“secure system”tend to appear in positive *** the basis of information system success theory,we categorized the topics“convenience,”“user-friendly interface,”and“simple process,”as system *** addition,“poor customer service”was categorized as service ***,based on the previous studies of trust and security,“lack of reliability”and“secure system”were categorized as trust and security,*** outcomes indicate that users are satisfied when they perceive that system quality and security of specific mobile payments are *** the contrary,users are dissatisfied when they feel that service quality and reliability of specific mobile payments is ***,our research implies that a novel structural topic model is an effective method to explore mobile payment user experience.

关键词： Mobile payment user satisfaction online review structural topic model

Onsite-effects of dual-hemisphere versus conventional single-hemisphere transcranial direct current stimulation A functional MRI study

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Neural Regeneration Research 2012年第24期7卷 1889-1894页

作者： yong Hyun Kwon Sung Ho jang Department of Physical Therapy Yeungnam College of Science & TechnologyDaegu 705-703Republic of Korea Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717Republic of Korea

We performed functional MRI examinations in six right-handed healthy *** functional MRI scanning,transcranial direct current stimulation was delivered with the anode over the right primary sensorimotor cortex and the cathode over the left primary sensorimotor cortex using dual-hemispheric transcranial direct current *** was compared to a cathode over the left supraorbital area using conventional single-hemispheric transcranial direct current stimulation. Voxel counts and blood oxygenation level-dependent signal intensities in the right primary sensorimotor cortex regions were estimated and compared between the two transcranial direct current stimulation *** results showed that dual-hemispheric transcranial direct current stimulation induced greater cortical activities than single-hemispheric transcranial direct current *** findings suggest that dual-hemispheric transcranial direct current stimulation may provide more effective cortical stimulation than single-hemispheric transcranial direct current stimulation.

关键词： transcranial direct current stimulation dual-hemispheric stimulation cortical activation functional MRI primary sensorimotor cortex neuroimaging regeneration neural regeneration

Corrosion characteristics of steel in seawater containing various chloride concentrations generated by electrochemical method

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中国有色金属学会会刊：英文版 2009年第B9期19卷 50-55页

作者： Seong-Jong kim Seok-Ki jang Division of Marine Engineering Mokpo Maritime University

The electro-clean system (ECS), a ballast water management system that eliminates harmful aquatic organisms in ship ballast water via electrochemically produced chloride, was developed. The current density for potentiostatic experiments subjected to seawater with an applied potential (-0.1 V) at various TRC concentrations (2×10-6, 6×10-6, 10×10-6, and 15×10-6) have similar results. The current density at -0.1 V has the highest value compared with that at -0.7 V and -0.4 V. For all concentrations, the current density increases with increasing applied potential.

关键词：含氯化物电化学方法腐蚀特性浓度海水船舶压载水钢铁电流密度

Presence of CCK-A, B receptors and effect of gastrin and cholecystokinin on growth of pancreatobiliary cancer cell lines

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World Journal of Gastroenterology 2005年第6期11卷 803-809页

作者： Jin-Young jang Sun-Whe kim Ja-Lok Ku yong-Hyun Park Jae-Gahb Park Department of Surgery

AIM: To investigate the effects of gastrin and cholecystokinin (CCK) and their specific antagonists on the growth of pancreatic and biliary tract cancer cell lines. METHODS: Five pancreatic and 6 biliary cancer cell lines with 2 conrtol cells were used in this study. Cell proliferation study was done using 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) test and direct cell count method. Reverse transcription-polymerase chain reaction (RT-PCR) and slot blot hybridization were performed to examine and quantify the expression of hormonal receptors in these cell lines. RESULTS: SNU-308 showed a growth stimulating effect by gastrin-17, as did SNU-478 by both gastrin-17 and CCK-8. The trophic effect of these two hormones was completely blocked by specific antagonists (L-365, 260 for gastrin and L-364, 718 for CCK). Other cell lines did not respond to gastrin or CCK. In RT-PCR, the presence of CCK-A receptor and CCK-B/gastrin receptor mRNA was detected in all biliary and pancreatic cancer cell lines. In slot blot hybridization, compared to the cell lines which did not respond to hormones, those that responded to hormones showed high expression of receptor mRNA. CONCLUSION: Gastrin and CCK exert a trophic action on some of the biliary tract cancers.

关键词： Bile duct cancer Gallbladder cancer Pancreatic cancer Gastrin Cholecystokinin

Mitochondrial Reactive Oxygen Species Elicit Acute and Chronic Itch via Transient Receptor Potential Canonical 3 Activation in Mice

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Neuroscience Bulletin 2022年第4期38卷 373-385页

作者： Seong-Ah kim Jun Ho jang Wheedong kim Pa Reum Lee yong Ho kim Hue Vang Kihwan Lee Seog Bae Oh Department of Neurobiology and Physiology School of Dentistry and Dental Research InstituteSeoul National UniversitySeoul 03080Republic of Korea Department of Brain and Cognitive Sciences College of Natural SciencesSeoul National UniversitySeoul 08826Republic of Korea Gachon Pain Center and Department of Physiology College of MedicineGachon UniversityIncheon 21999Republic of Korea Tooth-Periodontium Complex Medical Research Center School of DentistrySeoul National UniversitySeoul 03080Republic of Korea

Mitochondrial reactive oxygen species(mROS)that are overproduced by mitochondrial dysfunction are linked to pathological conditions including sensory ***,we explored whether mROS overproduction induces itch through transient receptor potential canonical 3(TRPC3),which is sensitive to *** injection of antimycin A(AA),a selective inhibitor of mitochondrial electron transport chain complex III for mROS overproduction,produced robust scratching behavior in naïve mice,which was suppressed by MitoTEMPO,a mitochondria-selective ROS scavenger,and Pyr10,a TRPC3-specific blocker,but not by blockers of TRPA1 or *** activated subsets of trigeminal ganglion neurons and also induced inward currents,which were blocked by MitoTEMPO and ***,dry skin-induced chronic scratching was relieved by MitoTEMPO and Pyr10,and also by resveratrol,an *** together,our results suggest that mROS elicit itch through TRPC3,which may underlie chronic itch,representing a potential therapeutic target for chronic itch.

关键词： Mitochondria Reactive oxygen species TRPC3 Itch Dry skin Trigeminal ganglia

Lower risk of subarachnoid haemorrhage in diabetes:a nationwide population-based cohort study

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Stroke & Vascular Neurology 2021年第3期6卷 402-409页

作者： jang Hoon kim Jimin Jeon Jinkwon kim Department of Neurosurgery Yongin Severance HospitalYonsei University College of MedicineSeoulSouth Korea Department of Neurology Yongin Severance HospitalYonsei University College of MedicineSeoulSouth Korea

Background and purpose Diabetes mellitus(DM)is a common metabolic disorder with increased risk of cardiovascular and cerebrovascular ***,its relationship with risk of subarachnoid haemorrhage(SAH),the most devastating form of stroke,remains *** To evaluate the relationship between DM and risk of SAH,we performed a retrospective cohort study using a nationwide,population‐based,health screening database in *** included participants without history of stroke who underwent a nationwide health screening programme between 2003 and *** outcome was occurrence of *** were followed up until development of SAH or December *** Cox proportional hazards regression analysis was performed with adjustments for age,sex,systolic blood pressure,total cholesterol,body mass index,physical activity,smoking status,alcohol habit,household income and treatment with antihypertensive agents and *** Among 421768 study participants,prevalence of DM was 9.6%.During a mean follow-up period of 11.6±1.9 years,1039 patients developed *** of DM was significantly associated with decreased risk of SAH(adjusted HR 0.68;95%CI 0.53 to 0.86;p<0.001).Elevated level of fasting blood glucose was also negatively associated with risk of SAH(adjusted HR per 1 mmol/L increase 0.90;95%CI 0.86 to 0.95;p<0.001).Conclusion DM and elevated level of fasting blood glucose were inversely associated with risk of *** studies may elucidate the possibly protective,pathophysiological role played by hyperglycaemia in patients at risk of SAH.

关键词： protective nationwide elevated

Oral administration of red ginseng powder fermented with probiotic alleviates the severity of dextran-sulfate sodium-induced colitis in a mouse model

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Chinese Journal of Natural Medicines 2017年第3期15卷 192-201页

作者： jang Sun-Hee PARK Jisang kim Sae-Hae CHOI Kyung-Min KO Eun-Sil CHA Jeong-Dan LEE Young-Ran jang Hyonseok jang yong-Suk Department of Molecular Biology and Institute for Molecular Biology and Genetics Chonbuk National UniversityJeonju 54896Korea Department of Bioactive Material Sciences and Research Center of Bioactive Materials Chonbuk National UniversityJeonju 54896Korea Department of Efficacy Research Institute of Jinan Red GinsengJinan 55442Korea Department of Mathematics Sogang UniversitySeoul 04107Korea Department of Oral Maxillofacial Surgery Korea University Ansan HospitalAnsan 15355Korea

Red ginseng is a well-known alternative medicine with anti-inflammatory *** exerts pharmacological effects through the transformation of saponin into metabolites by intestinal *** that intestinal microflora vary among individuals,the pharmacological effects of red ginseng likely vary among *** order to produce homogeneously effective red ginseng,we prepared probiotic-fermented red ginseng and evaluated its activity using a dextran sulfate sodium(DSS)-induced colitis model in *** analysis of intestinal damage indicated that the administration of probiotic-fermented red ginseng significantly decreased the severity of colitis,compared with the control and the activity was higher than that induced by oral administration of ginseng powder or probiotics *** analysis of the levels of serum IL-6 and TNF-α,inflammatory biomarkers that are increased at the initiation stage of colitis,were significantly decreased in probiotic-fermented red ginseng-treated groups in comparison to the control *** levels of inflammatory cytokines and mR NAs for inflammatory factors in colorectal tissues were also significantly decreased in probiotic-fermented red ginseng-treated ***,oral administration of probiotic-fermented red ginseng reduced the severity of colitis in a mouse model,suggesting that it can be used as a uniformly effective red ginseng product.

关键词： Colitis Fermentation Inflammation Probiotics Red ginseng

Ionizing terahertz waves with 260 MV/cm from scalable optical rectification

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Light(Science & Applications) 2024年第6期13卷 1075-1087页

作者： Hyeongmun kim Chul Kang Dogeun jang Yulan Roh Sang Hwa Lee Joong Wook Lee Jae Hee Sung Seong Ku Lee Ki-yong kim Advanced Photonics Research Institute GISTGwangju61005Korea Department of Physics and Optoelectronics Convergence Research Center Chonnam National UniversityGwangju61186Korea Pohang Accelerator Laboratory POSTECHPohang37673Korea Center for Relativistic Laser Science Institute for Basic ScienceGwangju61005Korea Institute for Research in Electronics and Applied Physics Department of PhysicsUniversity of MarylandCollege ParkMaryland20742USA

Terahertz(THz)waves,known as non-ionizing radiation owing to their low photon energies,can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and ***,we demonstrate the generation of ionizing,multicycle,15-THz waves emitted from large-area lithium niobate crystals via phase-matched optical rectification of 150-terawatt laser pulses.A complete characterization of the generated THz waves in energy,pulse duration,and focal spot size shows that the field strength can reach up to 260 megavolts per *** particular,a single-shot THz interferometer is employed to measure the THz pulse duration and spectrum with complementary numerical *** intense THz pulses are irradiated onto various solid targets to demonstrate THz-induced tunneling ionization and plasma *** study also discusses the potential of nonperturbative THz-driven ionization in gases,which will open up new opportunities,including nonlinear and relativistic THz physics in plasma.

关键词： optical interferometer matched

Enhancing ammonia production rates from electrochemical nitrogen reduction by engineering three-phase boundary with phosphorus-activated Cu catalysts

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Journal of Energy Chemistry 2023年第9期84卷 394-401页

作者： Jeehye kim Cho Hee Lee yong Hyun Moon Min Hee Lee Eun Hyup kim Sun Hee Choi Youn Jeong jang Jae Sung Lee School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Pohang Accelerator Laboratory(PAL) Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Electrochemical N_(2) reduction reaction(eNRR) over Cu-based catalysts suffers from an intrinsically low activity of Cu for activation of stable N_(2) molecules and the limited supply of N_(2) to the catalyst due to its low solubility in aqueous ***,we propose phosphorus-activated Cu electrocatalysts to generate electron-deficient Cu sites on the catalyst surface to promote the adsorption of N_(2) *** eNRR system is further modified using a gas diffusion electrode(GDE) coated with polytetrafluoroethylene(PTFE) to form an effective three-phase boundary of liquid water-gas N_(2)-solid catalyst to facilitate easy access of N_(2) to the catalytic *** a result,the new catalyst in the flow-type cell records a Faradaic efficiency of 13.15% and an NH_(3) production rate of 7.69 μg h^(-1) cm^(-2) at-0.2 V_(RHE),which represent 3.56 and 59.2 times increases from those obtained with a pristine Cu electrode in a typical electrolytic *** work represents a successful demonstration of dual modification strategies;catalyst modification and N_(2) supplying system engineering,and the results would provide a useful platform for further developments of electrocatalysts and reaction systems.

关键词： Electrochemical nitrogen reduction reaction Ammonia production Phosphorous modified copper electrodes Gas diffusion electrodes Three-phase boundary PTFE coating