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Design of Authoring Tool for Static and Dynamic Projection Mapping

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Computers, Materials & Continua 2021年第1期66卷 1-16页

作者： Sang-Joon Kim Nammee Moon min Hong Gooman Park Yoo-Joo choi Seoul National University of Science and Technology 172 Gongneung-dongNowon-guSeoulKorea Hoseo University 165 Sechul-ri Baebang-eupAsan-siChungcheongnam-doKorea Soonchunhyang University 336-745Asan-siChungcheongnam-doKorea Seoul Media Institute Technology 661 Deungchon-dongGangseo-guSeoulKorea

This study introduces the design details of a tool to create interactive projection-mapping content in a convenient *** the proposed tool design,a homography-based camera–projector calibration method was applied with the use of red–green–blue-depth images from a Kinect V2 sensor that did not require accurate camera calibration *** addition,the proposed tool simultaneously achieved static projection mapping that projected the image content onto a fixed object,and dynamic projection mapping that projected the image content onto a user’s body,by tracing the moving *** verify the effectiveness of the proposed content-creation tool,users with no programming capabilities were employed to create contents that were projected onto various objects in fixed positions and a user’s body in various poses,thereby analyzing the tool’s ***,the projection accuracy was analyzed at different depth positions,and the projection-mapping accuracy was verified with the use of the proposed method.

关键词： Dynamic projection mapping camera-projector calibration Kinect projection mapping content authoring tool

Releasing the hidden shift current in the TTF-CA organic molecular solid via symmetry lowering

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npj Computational Materials 2020年第1期6卷 1614-1619页

作者： Bumseop Kim Jeongwoo Kim Dongbin Shin min choi Junhee Lee Noejung Park Department of Physics Ulsan National Institute of Science and TechnologyUlsan 689-798Korea Department of Physics Incheon National UniversityIncheon 406-772Korea Department of Energy and Chemical engineering Ulsan National Institute of Science and TechnologyUlsan 689-798Korea

Bulk photovoltaic effect,characterized by an excitation-driven unbiased spontaneous photocurrent,has attracted substantial attention mainly due to its potential for harvesting solar ***,we investigate the photovoltaic characteristics of organic molecular solids and focus on the association between the photocurrent and the crystal symmetry in the exemplary case of *** perform comprehensive first-principles calculations,including direct evaluations of the excitedstate current via real-time propagations of the time-dependent density functional *** find that the charge shifting in the low-temperature phase is mainly driven by the intrachain ferroelectricity,which gives rise to a photocurrent not only in the visiblelight range but also near the band-edge infrared *** shift current that is locked in the symmetry of the high-temperature phase can be released by introducing a potential *** suggest that organic molecular solids can be exploited via appropriate engineering to lower the symmetry,aiming at room-temperature photovoltaics.

关键词： theory symmetry solids

Assessment of risk of complications in cirrhosis using portal thallium scans

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World Journal of Gastroenterology 2014年第1期20卷 228-234页

作者： Hye-Jin Tae Dae-Won Jun Yun-Young choi min-Jung Kwak min-Ho Lee Department of Internal Medicine Hanyang University School of MedicineSeoul 133-792South Korea Department of Nuclear Medicine Hanyang University College of MedicineSeoul 133-792South Korea Department of Computer Science and Statistics Pyongtaek UniversityPyongtaek 450-701South Korea

AIM:To investigate the usefulness of a novel thallium scan shunt index for assessing portosystemic shuntrelated cirrhotic ***:We enrolled 209 chronic hepatitis B-related cirrhosis *** rectal thallium instillation,radioactive isotope activity in the heart and liver was *** ratio of radiation uptake between the heart and the liver was calculated(the shunt index).This value indicates the degree of portosystemic circulation *** tests,serum biochemistry tests,abdominal ultrasonography,gastroscopy and examination of clinical features such as the occurrence of varices,bleeding and hepatic encephalopathy were *** analysis was used to identify independent risk factors for *** compared the cumulative incidence rates of complications during the follow-up ***:The thallium scan shunt index was significantly higher in the decompensated liver cirrhosis group than in the compensated liver cirrhosis group(0.91±0.39 vs 0.39±0.32,P<0.001).It was also higher in the varices group,the hepatic encephalopathy group,and the variceal bleeding group than in the control group(P<0.001).Multivariate analysis showed that the index was an independent risk factor for predicting decompensated liver *** the cut-off value was 0.75,the shunt index had a sensitivity of 82.6%,a specificity of 84%,a positive predictive value of 61.5%,and a negative predictive value of 94.4%in diagnosing decompensated *** the shunt index was greater than 0.75,there was a significant increase in the number of decompensated ***:The thallium shunt index is a good predictor of cirrhosis-related complications.

关键词： Liver cirrhosis Portosystemic shunt Decompensation

Effect of pre-twinning and heat treatment on formability of AZX311 Mg alloy

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Journal of Magnesium and Alloys 2024年第3期12卷 1154-1169页

作者： Mahesh Panchal Lalit Kaushik min-Seong Kim Ravi Kottan Renganayagalu Shi-Hoon choi Jaiveer Singh Department of Mechanical Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Department of Metallurgical and Materials Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Energy Materials Research Center Korea Institute of Science and Technology(KIST)5 Hwarang-roSeongbuk-guSeoul 02792Republic of Korea Department of Advanced Components and Materials Engineering Sunchon National University255 Jungang-roSuncheonJeonnam 57922Republic of Korea

In this study,the effects of pre-strain-induced tensile twins(TTWs)and controlled heat treatment on the formability behavior of AZX311 Mg alloy sheets were investigated.A 4%compressive strain was applied to pre-strain the sheets using the in-plane compression(IPC)technique along the rolling direction(RD)to introduce *** pre-strained(PS)samples were subsequently heat-treated at 250℃,350℃,and 400℃ independently for 1 hr,and are termed as PSA1,PSA2,and PSA3,*** cupping tests were conducted to assess the formability of the sheet samples under different initial *** results showed that the PS sample heat-treated at 250℃ for 1hr exhibited a decrease in the Erichsen index(IE)compared to the as-rolled sample,whereas PSA2 and PSA3 samples showed an increase in IE *** analysis revealed that most of the TTWs generated through pre-twinning were stable at 250℃;however,the twin volume fraction reduced to 41%at 350℃ compared to the PS samples due to enhanced thermal activity at that ***,PSA2 samples showed severe grain coarsening in some areas of the sample,and the fraction of such grains increased in the PSA3 *** stretch formability(IE value)of PSA2 samples showed a 32.3%increase compared to the as-rolled ***,the analysis of the deformed specimen at failure under the Erichsen test indicated that considerable detwinning occurs in the PS and PSA1 samples,whereas dislocation slip activity dominates in the PSA2 and PSA3 samples during stretch *** from detwinning and dislocation slip,deformation twins were also observed in all samples after the Erichsen ***,this work highlights the importance of texture control and its underlying mechanisms via pre-twinning followed by heat treatment and their impact on the room temperature(RT)stretch formability of AZX311 Mg alloy sheets.

关键词： Mg alloys Pre-twinning Texture Formability EBSD.

Novel extended C-m models of flow stress for accurate mechanical and metallurgical calculations and comparison with traditional flow models

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Journal of Magnesium and Alloys 2022年第9期10卷 2516-2533页

作者： Man Soo Joun Mohd Kaswandee Razali Jae Dong Yoo min Cheol Kim Jeong Muk choi ReCAFT Gyeongsang National UniversityGraduate School of Mechanical and Aerospace EngineeringJinju 52828South Korea Gyeongsang National University Graduate School of Mechanical and Aerospace EngineeringJinju 52828South Korea MFRC Research CenterJinju 52818South Korea Jinhap Daejeon 34302South Korea

Here,we developed novel extended piecewise bilinear power law(C-m)models to describe flow stresses under broad ranges of strain,strain rate,and temperature for mechanical and metallurgical calculations during metal forming at elevated *** traditional C-m model is improved upon by formulating the material parameters C and m,defined at sample strains and temperatures as functions of the strain *** coefficients are described as a linear combination of the basis functions defined in piecewise patches of the sample strain and temperature domain.A comparison with traditional closed-form function flow models revealed that our approach using the extended piecewise bilinear C-m model is superior in terms of accuracy,ease of use,and adaptability;additionally,the extended C-m model was applicable to numerical analysis of mechanical,metallurgical,and microstructural ***,metallurgy-related values can be calculated directly from the flow stress *** the proposed model was developed for materials at elevated temperatures,it can be applied over a broad temperature range.

关键词： Flow stress Power law model Piecewise bilinear function Numerical analysis Microstructural prediction Peak strain

Effects of granulation process variables on the physical properties of dosage forms by combination of experimental design and principal component analysis

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Asian Journal of Pharmaceutical Sciences 2019年第3期14卷 287-304页

作者： Prakash Thapa Du Hyung choi min Soo Kim Seong Hoon Jeong College of Pharmacy Dongguk UniversityGyeonggi10326Republic of Korea Department of Pharmaceutical Engineering Inje UniversityGyeongnam50834Republic of Korea College of Pharmacy Pusan National UniversityBusan46241Republic of Korea

The current study was to understand how process variables of high shear wet granulations affect physical properties of granules and tablets. The knowledge gained was intended to be used for Quality-by-Design based process design and optimization. The variables were selected based on the risk assessment as impeller speed, liquid addition rate, and wet massing time. Formulation compositions were kept constant to minimize their influence on granules properties. Multiple linear regression models were built providing understanding of the impact of each variable on granule hardness, Carr’s index, tablet tensile strength, surface mean diameter of granules, and compression behavior. The experimental results showed that the impact of impeller speed was more dominant compared to wet massing time and water addition rate. The results also revealed that quality of granules and tablets could be optimized by adjusting specific process variables(impeller speed 1193 rpm, water spray rate 3.7 ml/min, and wet massing time 2.84 min). Overall desirability was 0.84 suggesting that the response values were closer to the target one. The SEM image of granules showed that spherical and smooth granules produced at higher impeller speed, whereas rough and irregular shape granules at lower speed. Moreover, multivariate data analysis demonstrated that impeller speed and massing time had strong correlation with the granule and tablet properties. In overall, the combined experimental design and principal component analysis approach allowed to better understand the correlation between process variables and granules and tablet attributes.

关键词： Experimental design Principal component analysis High shear granulation Process parameter

The secretory products of Trichomonas vaginalis decrease fertilizing capacity of mice sperm in vitro

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Asian Journal of Andrology 2015年第2期17卷 319-323,I0012页

作者： Jaesook Roh Young-Su Lim min-Young Seo Yuri choi Jae-Sook Ryu Department of Anatomy and Cell Biology Laboratory of Reproductive Endocrinology College of Medicine Hanyang University Seoul Korea Department of Anesthesiology and Pain Medicine St. Mary's Hospital Catholic University Incheon Korea Department of Environmental Biology and Medical Parasitology College of Medicine Hanyang University Seoul Korea.

Trichomonas vaginalis infection is one of the most prevalent sexually transmitted infections in humans and is now recognized as an important cause of infertility in men. There is little information about the effect of extracellular polymeric substances （EPS） from T. vaginalis on sperm, but previous reports do not provide a conclusive description of the functional integrity of the sperm. To investigate the impact of EPS on the fertilizing capacity of sperm, we assessed sperm motility, acrosomal status, hypo-osmotic swelling, and in vitro fertilization rate after incubating the sperm with EPS in vitro using mice. The incubation of sperm with EPS significantly decreased sperm motility, viability, and functional integrity in a concentration and time-dependent manner. These effects on sperm quality also resulted in a decreased fertilization rate in vitro. This is the first report that demonstrates the direct negative impact of the EPS of T. vaginalis on the fertilization rate of sperm in vitro. However, further study should be performed using human sperm to determine if EPS has similar negative impact on human sperm fertilizing capacity in vitro.

关键词： extracellular polymeric substances fertilization sperm Trichomonas vaginalis

Impacts of statin and metformin on neuropathy in patients with type 2 diabetes mellitus: Korean Health Insurance data

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World Journal of Clinical Cases 2021年第33期9卷 10198-10207页

作者： Hong Ki min Se Hee Kim Jong Han choi Kyomin choi Hae-Rim Kim Sang-Heon Lee Department of Internal Medicine Konkuk University Medical CenterSeoul KS013South Korea Department of Neurology Konkuk University Medical CenterSeoul KS013South Korea Division of Rheumatology Department of Internal MedicineKonkuk University School of MedicineSeoul KS013South Korea

BACKGROUND Neuropathy is a common chronic complication in type 2 diabetes mellitus(T2DM).Statin and metformin are commonly used medications in T2DM patients,and some studies showed statin-or metformin-induced *** To evaluate the incidence of neuropathy among patients with T2DM associated with statin and metformin *** Korean Health Insurance Review and Assessment national patient sample data from 2016 and 2017 were *** with T2DM and no complications were divided into statin/metformin/statin+metformin users and *** incidence was defined by International Statistical Classification of Diseases and Related Health Problems,10th revision codes and concomitant prescriptions for anticonvulsants or *** regression analyses were conducted to examine the associations between statin/metformin/statin+metformin therapies and the incidence of *** score(PS)matching was performed on the basis of age,sex and *** Overall,34964 and 35887 patients with T2DM and no complications were included in the Korean Health Insurance Review and Assessment national patient sample datasets from 2016 and 2017,*** therapy was associated with increased risks of neuropathy in 2016 and 2017[PS-matched odds ratio(OR)=1.22,95%confidence interval(CI):1.08-1.38;PS-matched OR=1.17,95%CI:1.03-1.33,respectively].Metformin therapy was associated with reduced risks of neuropathy in 2016 and 2017(PS-matched OR=0.30,95%CI:0.21-0.42;PSmatched OR=0.44,95%CI:0.32-0.60,respectively).Combined statin+metformin therapy was not significantly associated with neuropathy in 2016 or 2017(PSmatched OR=0.85,95%CI:0.61-1.19;PS-matched OR=0.95,95%CI:0.66-1.38,respectively).CONCLUSION Statin therapy was associated with enhanced risk of new-onset neuropathy in patients with T2DM,but metformin therapy showed the opposite association.

关键词： Diabetes mellitus Neuropathies Hydroxymethylglutaryl-CoA reductase inhibitors Metformin

9-Hydroxy-6,7-dimethoxydalbergiquinol suppresses hydrogen peroxide-induced senescence in human dermal fibroblasts through induction of sirtuin-1 expression

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Asian Pacific Journal of Tropical Biomedicine 2021年第2期11卷 89-96页

作者： Seok-Hee Lim Bing Si Li Ri Zhe Zhu Byung-min choi Department of Biochemistry School of MedicineInstitute of BiotechnologyWonkwang University460 Iksandae-roIksanJeonbuk 54538Republic of Korea

Objective:To investigate the potential anti-aging mechanism of9-hydroxy-6,7-dimethoxydalbergiquinol(HDDQ)on hydrogen peroxide(H2O2)-induced oxidative stress in human dermal fibroblasts(HDFs).Methods:The effect of HDDQ on cell viability was assessed by MTT assay,and the effects of HDDQ on senescence-like phenotypes were determined by senescence-associatedβ-galactosidase(SA-β-gal)staining,Western blotting analysis,and a cell proliferation *** expression level and activity of sirtuin-1(SIRT1)induced by HDDQ were also ***:HDDQ reversed senescence-like phenotypes in the oxidant-challenged model,through reducing SA-β-gal activity and promoting cell ***,decreases in ac-p53,p21Cip1/WAF1,and p16Ink4a and an increase in p Rb were *** induced the expression of SIRT1 in a concentration-and time-dependent ***,HDDQ inhibited H2O2-induced phosphorylation of Akt by SIRT1 up-regulation and reduced SA-β-gal ***:HDDQ inhibits H2O2-induced premature senescence and upregulation of SIRT1 expression plays a vital role in the inhibition of the senescence phenotype in HDFs.

关键词： 9-Hydroxy-6,7-dimethoxydalbergiquinol Hydrogen peroxide Senescence Sirtuin-1 Human dermal fibroblasts