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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

Optic radiation injury in patients with aneurismal subarachnoid hemorrhage: a preliminary diffusion tensor imaging report

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Neural Regeneration Research 2018年第3期13卷 563-566页

作者： Sung Ho jang Chul hoon Chang Young Jin Jung Seong Ho kim Jeong Pyo Seo Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Department of Neurosurgery College of Medicine Yeungnam University

Visual field defect is one of the various clinical manifestations in patients with subarachnoid hemorrhage（SAH）. Little is known about the pathogenic mechanism of visual field defect in SAH. In the current study,we investigated the diffusion tensor imaging （DTI） finding of the optic radiation in patients with SAH followingrupture of a cerebral artery aneurysm. We recruited 21 patients with aneurismal SAH （12 males, 9 females, mean age, 52.67 years; range, 41–68 years） who showed no definite lesion along the visual ***-one age-and sex-matched normal control subjects were also recruited. DTI data were acquired at an average of 5.9 weeks （range： 3–12 weeks） after onset and reconstruction of the optic radiation was performed using DTI-Studio software. The fractional anisotropy value, apparent diffusion coefficient value,and fiber number of the optic radiation were measured. The fractional anisotropy value of the optic radiation was significantly decreased, and the apparent diffusion coefficient value was significantly increased, in patients with aneurismal SAH than in normal control subjects. However, there was no significant difference in the fiber number of the optic radiation between patients with aneurismal SAH and normal control subjects. The decrement of fractional anisotropy value and increment of apparent diffusion coefficient value of the optic radiation in patients with aneurismal SAH suggest optic radiation injury. Therefore, we recommend a thorough evaluation for optic radiation injury in patient with aneurismal SAH.

关键词： nerve regeneration diffusion tensor imaging optic radiation subarachnoid hemorrhage visual field defect neural regeneration

Dynamic Changes in Left and Right Cerebral Oxygen Saturation during Selective Cerebral Perfusion in Young Infants

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Congenital Heart Disease 2023年第6期18卷 639-647页

作者： Hwa-Young jang Sang-Jun Beon Sung-hoon kim In-Kyung Song Won-Jung Shin Department of Anesthesiology and Pain Medicine Laboratory for Cardiovascular DynamicsAsan Medical CenterUniversity of Ulsan College of MedicineSeoul05505Korea Department of Physician Education and Training Asan Medical CenterSeoul05505Korea

Objectives:We investigated whether the selective cerebral perfusion(SCP)technique causes differences in changes in cerebral perfusion between both hemispheres in young infants,using cerebral oxygen saturation(ScO2)as an ***,we determined the association between the discrepancy in ScO2 and cerebral perfu-sion pressure during ***:The difference in ScO2 between the left and right cerebral hemispheres(ΔScO2 Rt-Lt)was calculated during clamping of the innominate artery(IA)and during ***:In 25 infants(aged 2 to 78 days),the left and right ScO2 were well maintained(median 63.2%and 60.9%during IA clamping,respectively;64.0%and 65.6%during SCP,respectively).During IA clamping,right and left ScO2 decreased(med-ian-1.4%and-1.0%,respectively).During SCP,rightΔScO2 was higher compared to leftΔScO2(median 1.5%vs.0.6%;p<0.001).Eight patients had a higher rightΔScO2 than leftΔScO2 throughout *** had lowerΔScO2 Rt-Lt during IA clamping(median-3.2%vs.0.0%;p<0.001)and higherΔScO2 Rt-Lt during SCP than others(median 5.0%vs.-0.8%;p<0.001).During and after SCP,the correlation coefﬁcient between rightΔScO2 and change in the mean arterial pressure was higher in patients with a discrepancy than in others(r=0.731 vs.r=0.519;p<0.001).Conclusions:This study suggests that SCP permits adequate bilateral cerebral ***,the unilateral cerebral perfusion technique may cause a difference in cerebral perfusion between both hemispheres in young infants;this may depend on the perfusion pressure.

关键词： Cerebral circulation congenital heart defects monitoring near-infrared spectroscopy

Effect of natural extract eye drops in dry eye disease rats

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1023-1030页

作者： Soo Youn Choi Youngsub Eom Jee Yong kim Dong hoon jang Jong Suk Song Hyo Myung kim Department of Ophthalmology Korea University College of MedicineSeoul 02841Republic of Korea BGN World Tower Eye Clinic Seoul 05551Republic of Korea Department of Ophthalmology Korea University Ansan HospitalKorea University College of MedicineGyeonggi-do 15355Republic of Korea Medical O Co. Ltd.Seoul 06025Republic of Korea

AIM:To investigate the therapeutic effect of natural extract eye drops containing bee venom,musk,and deer antlers in dry eye disease(DED)animal ***:Scopolamine-injected DED rats and lacrimal gland-excised rats were allocated into control,saline,and natural extract groups respectively and a normal group(lacrimal gland excision was not performed)in lacrimal gland-excised *** eye drop instillation 4 times a day for 5 d,corneal fluorescein staining(CFS)scores,tear MUC5AC levels,and tear lactic dehydrogenase(LDH)levels were ***:In scopolamine-injected rats,the natural extract-treated group had significantly lower CFS scores(1.7±0.5,4.7±1.4,3.8±1.9,P=0.006)and tear LDH levels(0.10±0.01,0.19±0.01,0.16±0.08 OD,P=0.014)but higher tear MUC5AC levels(12.9±3.7,7.9±2.0,9.7±3.6 ng/m L,P=0.041)compared with the control and saline-treated *** were no significant differences between the control and saline-treated *** lacrimal gland-excised rats,the natural extract-treated group also had lower CFS scores(4.3±1.2,11.5±2.3,9.0±1.9,P<0.001,P=0.001)and tear LDH levels(0.30±0.08,0.48±0.12,0.39±0.05 OD,P<0.05)but higher tear volume(4.3±0.9,1.9±0.7,2.8±1.1 mm,P=0.005,P=0.124)and tear MUC5 AC levels(8.2±2.0,2.9±1.2,5.4±2.2 ng/m L,P<0.001,P=0.047)compared with the control and saline-treated *** were no significant differences in the CFS scores,tear MUC5AC level,and tear LDH level between the normal and natural extracttreated ***:The natural extract consisting of bee venom,musk,and deer antlers may have effectiveness in DED treatment by restoring the damaged ocular surface,increasing tear volume,and recovering the tear mucin layer in DED rats.

关键词： bee venom musk deer antler natural extract dry eye disease rat

Three-dimensional imaging of spatio-temporal dynamics of small blood capillary network in the cortex based on optical coherence tomography:A review

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Journal of Innovative Optical Health Sciences 2020年第1期3卷 97-112页

作者： Fangjian Xing jang-hoon Lee Collin Polucha Jonghwan Lee Jiangsu Key Laboratory for Opto-Electronic Technology School of Physics and Technology Nanjing Normal University Nanjing 210023P.R.China Center for Biomedical Engineering School of Engineering Brown University ProvidenceRhode IslandUSA Carney Institute for Brain Science Brown University ProvidenceRI 02906USA

Optical coherence tomography angiography(OCTA)has emerged as an advanced in vivo im-aging modality,which is widely used for the clinic ophthalmology and neuroscience research in the rodent brain cortex among *** on the high numerical aperture(NA)probing lens and the motion-corrected algorithms,a high-resolution imaging technique called OCT micro-angiography is applied to resolve the small blood capillary vessels ranging from 5μm to 10μm in *** OCT-based techniques are recently evolving further from the structural imaging of capillaries toward spatio-temporal dynamic imaging of blood flow in capillaries,here we present a review on the latest techniques for the dynamic flow *** on capillary blood flow using these techniques will help us better understand the roles of capillary blood flow for normal functioning of the brain as well as how it malfunctions in diseases.

关键词： Capillary vessel dynamics blood flow OCT angiography brain cortex micro-angiogram

Combination Treatment with Herbal Medicines and Western Medicines in Atopic Dermatitis:Benefits and Considerations

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Chinese Journal of Integrative Medicine 2016年第5期22卷 323-327页

作者： Jung-hoon kim Hyungwoo kim Division of Pharmacology School of Korean MedicinePusan National University

Herbal medicines （HMs） are often used in combination with Western medicines （WMs） to improve therapeutic efficacies of orthodox medicines. This review discussed the current status of combination treatment with HMs and WMs in clinical practices. The influence of HMs on bioavailability of WMs was also discussed from the pharmacokinetic point of view. In addition, benefits and considerations of combination treatment were discussed using data obtained from clinical trials and randomized controlled trials of HMs treatment in skin diseases.

关键词： combination treatment herbal medicine atopic dermatitis psoriasis pharmacokinetics

Prognostic value of 18-fluorodeoxyglucose positron emission tomography-computed tomography in resectable colorectal cancer

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World Journal of Gastroenterology 2012年第36期18卷 5072-5077页

作者： jang Eun Lee Sang Woo kim Jin Su kim Kyu Yong Choi Won Kyung Kang Seong Taek Oh Ie Ryung Yoo Sung hoon kim Department of Internal Medicine Seoul St.Mary's HospitalCollege of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea Department of Surgery College of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea Department of Radiology Seoul St.Mary's HospitalCollege of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea

AIM:To assess the prognostic value of preoperative 18 fluorodeoxyglucose positron emission tomography(FDG-PET)/computed tomography(CT) in patients with resectable colorectal ***:One hundred sixty-three patients with resectable colorectal cancer who underwent FDG-PET/CT before surgery were *** data including pathologic stage at presentation,histology,treatment,disease-free survival and the maximum standardized uptake value(SUVmax) of the primary tumor on FDG-PET/CT were retrospectively *** follow up duration was 756(range,419-1355).The primary end point was disease-free ***:Twenty-five of 163 patients(15.3%) had *** median SUVmax values of the recurrence and no-recurrence groups were 8.9(range,5-24) and 8.2(range,0-23,P = 0.998).Receiver operating characteristic(ROC) curve analysis showed no significant association between SUVmax and recurrence(area under the curve = 0.5,P = 0.998,95% CI:0.389-0.611).Because a statistically significant value was not found,SUVmax was dichotomized at its median of *** disease-free survival curve was analyzed using the median SUVmax(8.6) as the cut *** and multivariate analysis did not provide evidence that disease-free survival rates for the subgroups defined by the median SUVmax were significantly different(P = 0.52,P = 0.25).CONCLUSION:Our study suggests that the high FDG uptake of primary mass in resectable colorectal cancer doesn't have a significant relationship with tumor recurrence and disease-free survival.

关键词： Positron-emission tomography Colorectalneoplasms Disease-free survival Recurrence Prognosis

Efficacy of Helicobacter pylori eradication for the prevention of metachronous gastric cancer after endoscopic resection for early gastric cancer

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World Journal of Gastroenterology 2014年第11期20卷 2760-2764页

作者： Jae Young jang hoon Jai Chun Division of Gastroenterology Department of Internal MedicineCollege of MedicineKyung Hee UniversitySeoul 136-705South Korea Division of Gastroenterology and Hepatology Department of Internal MedicineInstitute of Digestive Disease and NutritionKorea University College of MedicineSeoul 136-705South Korea

Helicobacter pylori(***)plays an important role in gastric carcinogenesis,as the majority of gastric cancers develop from ***-infected gastric *** rate of early gastric cancer diagnosis has increased in Japan and Korea,where *** infection and gastric cancer are highly *** intestinal-type gastric cancer without concomitant lymph node metastasis is usually treated by endoscopic *** metachronous gastric cancers often develop because atrophic mucosa left untreated after endoscopic treatment confers a high risk of gastric *** efficacy of *** eradication for the prevention of metachronous gastric cancer remains ***,in patients who undergo endoscopic resection of early gastric cancer,*** eradication is recommended to suppress or delay metachronous gastric *** and regularly scheduled endoscopy should be performed to detect minute metachronous gastric cancer after endoscopic resection.

关键词： Helicobacter pylori Gastric cancer Endoscopic resection Metachronous cancer

Exergetical Analysis of Organic Flash Cycle with Two-Phase Expander for Recovery of Finite Thermal Reservoirs

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Journal of Thermal Science 2014年第6期23卷 572-579页

作者： Chul Ho Han Kyoung hoon kim Department of Intelligent Mechanical Engineering Kumoh National Institute of TechnologyDaehakro 61GumiGyeongbuk 730-701Korea Department of Mechanical Engineering Kumoh National Institute of TechnologyDaehakro 61GumiGyeongbuk 730-701Korea

In this work exergetical performance analysis is carried out based on the second law of thermodynamics for organic flash cycle(OFC) using a two-phase expander instead of throttle expansion in order to recover efficiently finite thermal *** exergy destructions(anergies) at various components of the system are theoretically investigated as well as the exergy *** show that the anergy of heat exchanger or two-phase expander decreases while the anergy of throttle valve increases with increasing flash temperature,and the exergy efficiency has an optimum value with respect to the flash *** the optimal conditions with respect to the flash temperature,exergy efficiency increases with the heating temperature and the component having the largest exergy destruction varies with the flash temperature or heating temperature.

关键词： organic flash cycle(OFC) low grade heat source exergy anecgy