http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seung-Chul Shin,Yeon Soo Chang,Jin-Sil Kim,Kyu-Hwan Lee 대한예방치과학회 2019 International Journal of Clinical Preventive Denti Vol.15 No.1
Objective: To compare the efficiencies of removing dental plaque and tongue plaque by toothbrushes that has omnidirectional bristles, the experiment was implemented with manual toothbrush type and sonic vibration toothbrush type. Methods: Sixty children who had agreed to participate in the clinical study were divided into the experimental group and the control group for 30 each. For each experimental and control group, the sonic vibration toothbrush that has omnidirectional bristles and the manual toothbrush that has omnidirectional were provided and the instruction for proper tooth brushing were given as well. Both a simplified patient hygiene performance (S-PHP) index and a tongue plaque index were checked for both the groups prior to the experiment and 1 week and 2 weeks after. The repeated measure ANOVA analysis was performed to check the difference between two groups. Results: Both the S-PHP index and the tongue plaque index decreased for experimental group compared to the control group, which showed a significant difference statistically at 1 week and 2 weeks after the clinical experiment (p<0.05). Conclusion: Based on the results of the clinical trials, the sonic vibration toothbrush was statistically more efficient than the manual toothbrush in the removal of tongue plaque as well as in the perspective of oral hygiene management.
Seung-Chul Shin,Soo-Kyung Jwa,Sung-Hyun Park,Pal-Hyung Lee,Yeon-Soo Chang 대한예방치과학회 2012 International Journal of Clinical Preventive Denti Vol.8 No.2
Objective: In order to compare the gingival subside effect by use of Neo-B 2 lanes toothbrush, as newly developed toothbrush available for modified Bass technique, to use with Butler 210 toothbrush, in clinical. Methods: 67 volunteers for comparing 3 lanes and 2 lanes toothbrush and 51 volunteers were joined in clinical test, dividing with 2 groups as control using Butler 210 toothbrush and experimental group as using Neo-B toothbrush, for 4 weeks, PHP, PMA, CPI and CPITN were checked at before 1 week, 2 weeks and 4 weeks later and compared the data. Results: The plaque removal effect was a little bit more by use of 3 lanes toothbrush than 2 lanes of Neo-B toothbrush, but there was no significant different statistically (p>0.05). PHP, PMA, CPI and CPITN were decreased at some period of using with Butler 210 2 lanes toothbrush as control group, for 4 weeks, otherwise, there were decreasing tendencies for all items for all terms I experimental group as using with Neo-B toothbrush (p<0.05). To use Neo-B toothbrush was more effective to decrease PMA by using for 4 weeks, than to use Butler 210 toothbrush. Conclusion: It was recommended to use Neo-B 2 lanes toothbrush for early stage of gingivitis dental patient in order to subside it.
Seungchul Shin,Dongmin Lee,Eunji Keum 대한교통학회 2022 대한교통학회 학술대회지 Vol.87 No.-
Micro-electric vehicles (MEVs) have been considered as a solution to the limits of conventional vehicles due to their strengths of the compact body and low running costs. Since the introduction of this future-era transport mode in 2017 in Korea, most studies mainly investigated its driving approval in motorways and safety standards including braking performance. In this case study, for surmising MEV’s potential use in urban areas, we made a concept, the roles of MEVs, from empirical data. We analyzed MEVs’ trajectory data from Jeonnam e-Mobility Regulation Free Special Zone (RFSZ) project, and described the statistics of the key performance measures, such as trip distance, trip duration, and trip speed, by their trip type. It was found that, although those measures may differ in their operational missions, the common purpose for recurring use was captured as its role of shortrange travel mode. Furthermore, this methodology used in this study might be transferred to other empirical studies when a new transportation mode is introduced in the future.
Numerical Study on Taylor Bubble Rising in Pipes
Seung Chul Shin,Gang Nam Lee,Kwang Hyo Jung,Hyun Jung Park,Il Ryong Park,Sung-bu Suh 한국해양공학회 2021 韓國海洋工學會誌 Vol.35 No.1
Slug flow is the most common multi-phase flow encountered in oil and gas industry. In this study, the hydrodynamic features of flow in pipes investigated numerically using computational fluid dynamic (CFD) simulations for the effect of slug flow on the vertical and bent pipeline. The compressible Reynold averaged Navier-Stokes (RANS) equation was used as the governing equation, with the volume of fluid (VOF) method to capture the outline of the bubble in a pipeline. The simulations were tested for the grid and time step convergence, and validated with the experimental and theoretical results for the main hydrodynamic characteristics of the Taylor bubble, i.e., bubble shape, terminal velocity of bubble, and the liquid film velocity. The slug flow was simulated with various air and water injection velocities in the pipeline. The simulations revealed the effect of slug flow as the pressure occurring in the wall of the pipeline. The peak pressure and pressure oscillations were observed, and those magnitudes and trends were compared with the change in air and water injection velocities. The mechanism of the peak pressures was studied in relation with the change in bubble length, and the maximum peak pressures were investigated for the different positions and velocities of the air and water in the pipeline. The pressure oscillations were investigated in comparison with the bubble length in the pipe and the oscillation was provided with the application of damping. The pressures were compared with the case of a bent pipe, and a 1.5 times higher pressures was observed due to the compression of the bubbles at the corner of the bent. These findings can be used as a basic data for further studies and designs on pipeline systems with multi-phase flow.
Seungchul Shin,Donghoon Shin,Youngwoo Lee,Chung Choo Chung 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, we propose sliding mode control (SMC) based on singular perturbation theory (SPT) for position tracking of permanentmagnet stepper motors (PMSMs). Separate time scale is a characteristic of the singular perturbation method. Therefore, singular perturbation theory can be applied to the position tracking control of PMSMs because the dynamics of PMSMs is separated into slow and fast dynamics. The proposed method consists of torque modulation, commutation scheme, and SMC. Torque modulation was developed to generate the desire currents. For position control, the SMC was proposed only position feedbackwithout any other observer. The simulation results validate the performance of the proposed method.
Seung-Chul Shin,Bong-Seok Shin,Myoung-Hee Sim,Kyu-Hwan Lee 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.3
Objective: In order to find the oral health promotion effects, a clinical study was accomplished by use of the mouth rinse contained with some mineral and oriental medicine substance extracts. Methods: Sixty adult volunteers age 30 to 60 years were collected and divided with 2 groups as experimental group and the control. Mouth gaggle solution with some mineral and oriental medical substance extracts was delivered to experimental group and normal mouth gaggle solution as Gaglin-strong (Dong-A LTD) was used for control group, for 2 weeks. Simplified Patient Hygiene Performance index (S-PHP), tongue plaque index, and gingival inflammation index at frontal area as Papillary, Marginal and Attached gingival index (PMA) were checked at before experiment, and two weeks after experiment, and compared the data with 2 groups. Results: Both of the results as the plaque index and tongue plaque index were decreased in 2 weeks later in experimental group (p<0.05). And PMA index was also decreased but no different between in experimental group and the control (p>0.05). Conclusion: The mouth gaggle solution contained with some mineral and oriental medicine substance extracts could be used for decreasing dental plaque or tongue plaque and expected for decreasing the oral malodor.
Seung-Chul Shin 대한예방치과학회 2018 International Journal of Clinical Preventive Denti Vol.14 No.2
In this paper, the theory and practice to develop the individual oral health index for dental patient was introduced, in consideration of the concept for evidence based and simple apply for the clinical use, in order to use it for the prevention based continuous and incremental oral health care system for dental patient. Individual oral health index as a representative level of oral health for each dental patient has been developed with the consideration of the 5 factors which can be influence the oral health in general as, the numbers and the health state of the residual natural teeth, caries state in the oral cavity, periodontal state, the other tissue health state and the oral health care habits or ability and the systemic conditions for individuals. The different weight for each factor was suggested through the regression model by some clinical tests. It would be important that this system as prevention based continuous and incremental dental care by use of computer system will be a motivation to spread the preventive cares in Korea gradually, through the encourage of the preventive cares effectively.
Sun-JungCho,JaeSeobJung,SeungChulShin,IngNyolJin,BokHyunKo,YunheeKimKwon,HaeyoungSuh-Kim,문일수 생화학분자생물학회 2003 Experimental and molecular medicine Vol.35 No.6
The 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNP), a protein of unknown function in vivo, is abundantly expresed in myelinating glia in two isoforms, CNP1 and CNP2. In this study, imu-noblot analysis showed that CNP1 is the major isoform in adult forebrain, and that both isoforms are included in the postsynaptic density (PSD) fraction and tyrosine-phosphorylated at the basal level. However, subcellular distribution and deter-gent extraction data showed that CNP is nonspeci-ficaly associated with the PSD fraction. Imuno-cytochemistry revealed that CNP is detected, in a weak but punctate patern, in disociated rat hipo-campal neurons of 3 days to 2 weeks in vitro. The CNP-positive punctae were distributed throughout soma and dendrites, and distinct from PSD95-posi-tive ones. Imunoblot analysis indicated that CNP and F11. Interestingly, in addition to the known two isoforms, a new CNP isoform of MW 45 kDa was expresed in these cel lines and was the ma-jor type of isoform in F1 cells. Taken together, our data sugest that CNP is expressed in the ear-ly stage of in vitro development and nonspeci-ficaly included in the adult rat PSD fraction.