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Journal of Central South University 2014年第10期21卷 3844-3849页

作者： kang-seok seo Doo-seuk Choi Key-sun Kim Department of Mechanical Engineering Graduate School Kongju National University Division of Automotive and Mechanical Engineering Kongju National University

The changes in vibration, sound, and sound quality with changes in the driving voltage of a power seat motor from 12.5 to 14.5 V were measured and analyzed, which was used in real vehicles. BSR(buzz, squeak, rattle), which occurs for the power seat mechanism during sliding operation, was also evaluated. In addition, the results were expressed in terms of sound quality metrics, which measure the RPM change and sound level versus voltage to analyze their statistical correlation. Furthermore, vibration measurement and analysis were conducted simultaneously to determine the noisiest conditions and the source of the noise. The changes in RPM and voltage of a motor, in addition to vibration and noise, were measured at the same time to determine how noise, RPM, and voltage are interrelated.

关键词： seat vibration seat noise sound quality voltage buzz squeak and rattle(BSR)

Do microRNA 96, 145 and 221 expressions really aid in Lhe prognosis of prostate carcinoma？

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Asian Journal of Andrology 2012年第5期14卷 752-757页

作者： Sung Gu kang Young Ran Ha seo Jin Kim seok Ho kang Hong seok Park Jeong Gu Lee Jun Cheon Department of Urology Korea University College of Medicine Seou1136-705 Republic of Korea and 2Department of Pathology Korea University College of Medicine Seoul 136 705 Republic of Korea Department of Pathology Korea University College of Medicine Seoul 136705 Republic of Korea

MicroRNAs （miRs） are small noncoding RNAs that have been reported to be premising diagnostic tools. We used quantitative real-time reverse transcription PCR （RT-qPCR） to analyze differentially expressed miRNAs in prostate tumor samples to determine its prognostic value. From 2007 to 2009, tumor tissues were obtained from 73 radical prostatectomy specimens. Differentially expressed miR-96, -145 and -221 were validated by TaqMan RT-qPCR using all 73 tissues. The prognostic value was assessed in terms of biochemical recurrence using Kaplan-Meier and Cox regression analyses. For our patient cohort, the mean age was 64.7 years （50-76 years） and the mean prostate-specific antigen （PSA） was 7.5 ng m1-1. During the follow-up period （mean, 19.4 months）, 14 of 73 （19.2%） patients developed biochemical recurrence. Expression of miR-96, -145 and -221 correlated strongly with each other, but there were no correlations between miRNA expression and clinicopathologic parameters. Kaplan-Meier survival curves using the log-rank test showed a decreased biochemical recurrence-free interval with pathologic stage （P〈O.O01）. In addition, patients with Gleason scores over 8, compared with those with a Gleason score of 6, showed a decreased biochemical recurrence-free interval in Kaplan-Meier analysis （P=O.O01）. However, expression of miR-96, -145 and -221 did not correlate with the biochemical recurrence interval in Kaplan-Meier survival curves or by multivariate analysis using the Cox proportional hazard regression model, either. In conclusion, we did not observe a significant correlation between the expression of miR-96, -145 and -221 and clinicopathologic parameters. To utilize miRNA as a diagnostic tool in clinical practice, more research is needed to understand miRNA mechanisms, identify miRNA targets, and further characterize miRNA function.

关键词： microRNA prognosis prostate cancer recurrence

Machine Vision Based Fish Cutting Point Prediction for Target Weight

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Computers, Materials & Continua 2023年第4期75卷 2247-2263页

作者： Yonghun Jang Yeong-seok seo Department of Computer Engineering Yeungnam UniversityGyeongsan38541Korea

Food processing companies pursue the distribution of ingredientsthat were packaged according to a certain weight. Particularly, foods like fishare highly demanded and supplied. However, despite the high quantity offish to be supplied, most seafood processing companies have yet to installautomation equipment. Such absence of automation equipment for seafoodprocessing incurs a considerable cost regarding labor force, economy, andtime. Moreover, workers responsible for fish processing are exposed to risksbecause fish processing tasks require the use of dangerous tools, such aspower saws or knives. To solve these problems observed in the fish processingfield, this study proposed a fish cutting point prediction method based onAI machine vision and target weight. The proposed method performs threedimensional(3D) modeling of a fish’s form based on image processing techniquesand partitioned random sample consensus (RANSAC) and extracts 3Dfeature information. Then, it generates a neural network model for predictingfish cutting points according to the target weight by performing machinelearning of the extracted 3D feature information and measured weight *** study allows for the direct cutting of fish based on cutting pointspredicted by the proposed method. Subsequently, we compared the measuredweight of the cut pieces with the target weight. The comparison result verifiedthat the proposed method showed a mean error rate of approximately 3%.

关键词： Machine vision fish cutting weight prediction artificial intelligence deep learning image processing

Suggestion of advanced regression model on friction angle of fault gouge in South Korea

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1368-1379页

作者： seong-Woo Moon Hyun-seok Yun Yong-seok seo Department of Earth and Environmental Sciences Chungbuk National University1 Chungdae-roCheongju-siChungcheongbuk-do28644South Korea

Although friction characteristics of fault gouge are important to understand reactivation of fault,behavior of earthquake,and mechanism of slope failure,analysis results of fault gouge have low accuracy mostly than those of soils or rocks due to its high heterogeneity and low ***,to improve the accuracy of analysis results,we conducted simple regression analysis and structural equation model analysis and selected major influential factors of friction characteristics among many factors,and then we deduced advanced regression model with the highest coefficient of determination(R^(2)) via multiple regression *** most coefficients of determination in simple regression analysis are below0.3-0.4,coefficient of determination in multiple regression analysis is remarkably large as 0.657.

关键词： Fault gouge Friction angle Simple regression analysis Structural equation model analysis Multiple regression analysis

Prospect of developing Nd-Fe-B-type magnet with high electrical resistivity

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Rare Metals 2020年第1期39卷 2-12页

作者： Hae-Woong Kwon Min-seok kang Department of Materials Science and Engineering Pukyong National UniversityBusan48547Republic of Korea

Nd-Fe-B-type magnet is exclusively used as a rotor magnet in the traction motor of hybrid electric vehicle(HEV)and electric vehicle(EV),but its overly high operating temperature is a lingering problem attached to the *** major cause of the high operating temperature is eddy current,which is readily generated in the highly conductive metallic magnet under alternating magnetic field from stator *** this article,temperature rise in the Nd-Fe-B-type magnet with varying electrical resistivity under alternating magnetic field is discussed with the intention of highlighting the importance of enhancing the electrical resistivity for reducing the operating temperature of the Nd-Fe-B-type rotor *** rise in the Nd-Fe-B-type magnet(dielectric salt-added die-upset magnet)with high electrical resistivity is noticeably lower compared to the magnet(commercial sintered rotor magnet)with lower electrical resistivity,substantiating the theory that enhancing the electrical resistivity in the rotor magnet is fairly effective for suppressing the over-rise of its operating temperature during ***-upset process is revealed to be particularly pertinent for the fabrication of highly dense salt-added magnet with high electrical resistivity.

关键词： Rare-earth magnet Nd-Fe-B-type magnet Rotor magnet Operating temperature Eddy current Electrical resistivity

Grain Size Control of Semisolid A356 Alloy Manufactured by Electromagnetic Stirring

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Journal of Materials Science & Technology 2005年第2期21卷 219-225页

作者： P.K.seo C.G.kang National Research Lab of Thixo-Rheo FormingSchool of Mechanical Engineering Pusan National University Pusan 609-735 KoreaNational Research Lab of Thixo-Rheo FormingSchool of Mechanical Engineering Pusan National University Pusan 609-735 Korea

To investigate the possibility of substituting the mechanical stirring system with electromagnetic stirring (EMS) system for aluminum rheo die-casting, the EMS under the different stirring cooling conditions was carried out. It was found that in the early period of solidification, the dendrite breakages led to a fine primary phase. When dendrites grew coarsely, the effect of ripening on grain size overwhelmed that of dendrite breakage. It was also found that the high cooling rate favored large nucleation rate, and led to a fine primary phase. But high cooling rate also made the growth rate of the dendrite arm, which prevented the dendrite arm from being sheared off. Therefore there were a suitable stirring time and suitable cooling rate to obtain the best rheo die-casting structure. Qualified semisolid A356 aluminum alloy was successfully manufactured with short time EMS.

关键词： Semisolid metal process Electromagnetic stirring Rheo die-casting Grain size control

Effects of methotrexate on collagen-induced arthritis in male Wistar rats

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The Journal of Biomedical Research 2019年第4期33卷 244-249页

作者： Jin seok kang Department of Biomedical Laboratory Science Namseoul University

To evaluate the effect of methotrexate on collagen-induced arthritis,micro-computed tomography(micro-CT)and histopathological analyses were used in male Wistar *** were divided randomly into three *** 1 was treated with 0.9% saline,and groups 2 and 3 were boosted with type II *** day 21 to 42,groups 1 and 2 were orally treated with 0.9% saline and group 3 was orally treated with 1.5 mg/kg *** rats were sacrificed at day 42 after the first collagen ***-CT analyses showed bony parameters,such as bone volume and trabecular number,were decreased in group 2 compared to group 1,and these parameters were recovered in group *** examination and pathological parameter scoring showed that the knee joints of rats in group 2 had severe joint destruction,showing cartilage and bone erosion,enlarged cavities with inflammatory cell infiltration and activation of synovial *** contrast,these changes were reduced in group *** together,methotrexate treatment showed therapeutic potential in male rat collageninduced arthritis model,and micro-CT analysis and histopathological tools could be integrated to assess the quantification/qualification of arthritic lesions.

关键词： arthritis rat collagen micro-computed tomography histopathology

Effect of an Artificial Caudal Fin on the Performance of a Biomimetic Fish Robot Propelled by Piezoelectric Actuators

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Journal of Bionic Engineering 2007年第3期4卷 151-158页

作者： seok Heo Tedy Wiguna Hoon Cheol Park Nam seo Goo Artificial Muscle Research Center Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Artificial Muscle Research Center and Smart Robot CenterKonkuk UniversitySeoul 143-701Korea

This paper addresses the design of a biomimetic fish robot actuated by piezoeeramic actuators and the effect of artificial caudal fins on the fish robot＇s performance. The limited bending displacement produced by a lightweight piezocomposite actuator was amplified and transformed into a large tail beat motion by means of a linkage system. Caudal fins that mimic the shape of a mackerel fin were fabricated for the purpose of examining the effect of caudal fm characteristics on thrust production at an operating frequency range. The thickness distribution of a real mackerel＇s fin was measured and used to design artificial caudal fins. The thrust performance of the biomimetic fish robot propelled by fins of various thicknesses was examined in terms of the Strouhal number, the Froude number, the Reynolds number, and the power consumption. For the same fm area and aspect ratio, an artificial caudal fin with a distributed thickness shows the best forward speed and the least power consumption.

关键词： LIPCA biomimetic fish robot caudal fro Strouhal number Froude number Reynolds number

Relationship of meteorological factors and air pollutants with medical care utilization for gastroesophageal reflux disease in urban area

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World Journal of Gastroenterology 2020年第39期26卷 6074-6086页

作者： Ho seok seo Jinwook Hong Jaehun Jung Division of Gastrointestinal Surgery Department of SurgerySeoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591South Korea Artificial Intelligence and Big-Data Convergence Center Gil Medical CenterGachon University College of Medicine and ScienceIncheon 21565South Korea Department of Preventive Medicine Gachon University College of MedicineIncheon 21565South Korea

BACKGROUND Gastroesophageal reflux disease(GERD)is a highly prevalent disease of the upper gastrointestinal tract,and it is associated with environmental and lifestyle *** to an increasing interest in the environment,several groups are studying the effects of meteorological factors and air pollutants(MFAPs)on disease *** To identify MFAPs effect on GERD-related medical *** Data on GERD-related medical utilization from 2002 to 2017 were obtained from the National Health Insurance Service of Korea,while those on MFAPs were obtained from eight metropolitan areas and *** total,20071900 instances of GERD-related medical utilizations were identified,and 200000 MFAPs were randomly selected from the eight metropolitan *** were analyzed using a multivariable generalized additive Poisson regression model to control for time trends,seasonality,and day of the *** Five MFAPs were selected for the prediction ***-related medical utilization increased with the levels of particulate matter with a diameter≤2.5μm(PM2.5)and carbon monoxide(CO).S-shaped and inverted U-shaped changes were observed in average temperature and air pollutants,*** time lag of each variable was significant around nine days after *** Using five MFAPs,the final model significantly predicted GERD-related medical *** particular,PM2.5 and CO were identified as risk or aggravating factors for GERD.

关键词： Gastroesophageal reflux disease Air pollution Meteorological factor Particulate matter Carbon monoxide

Diel vertical migration of the copepod Calanus sinicus before and during formation of the Yellow Sea Cold Bottom Water in the Yellow Sea

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Acta Oceanologica Sinica 2013年第9期32卷 99-106页

作者： kang Jung-Hoon seo MinHo KWON Oh Youn KIM Woong-seo South Sea Environment Research Division Korea Institute of Ocean Science&Technology (KIOST) Deep-sea and Seabed Resources Research Division

To understand the effects of the Yellow Sea Cold Bottom Water （YSCBW） on the diel vertical migration （D- VM） of the copepod Calanus sinicus, we surveyed vertical distribution of C. sinicus at a fixed station in the Yellow Sea before （spring） and during （summer） formation of the YSCBW. Cold water （〈10℃） was observed in the bottom layer when the water column was thermally stratified in summer, but the water column was thermally well-mixed in spring 2010. Samples were collected from five different layers at 3-h intervals using an opening-closing net. Adult females （1-155 ind./m3） showed a clear normal DVM pattern throughout the entire water column in spring, whereas adult males did not migrate. DVM of copepodite V （CV） individuals was not clear, but the maximum abundance of CI-CIV occurred consistently in the upper 10-20 m layer, where there was a high concentration of chlorophyll-a （Chl-a）（0.49-1.19μg/L）. In summer, weak DVM was limited to cold waters beneath the thermocline for adult females （〈30 ind./m3）, but not for adult males. The maximum abundance of CI-CIV also occurred consistently in the subsurface layer （20-40 m） together with high concentrations of Chl-a （0.81-2.36 μg/L）. CV individuals （1-272 ind./m3） moved slightly upward noc- turnally to the near-surface layer （10-20 m）, where the average temperature was 25.74℃, but they were not found in the surface layer （0-10 m; 28.31℃）. These results indicate that the existence of the YSBCW affected food availability at depth and the vertical temperature distribution, leading to variation in the amplitude and shape of stage-specific vertical distributions （CI to adults） in C. sinicus before and during the formation of cold waters in the Yellow Sea during the study period.

关键词： Yellow Sea Cold Bottom Water (YSCBW) copepod Calanus sinicus developmental stages,diel vertical migration (DVM)