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최석근, 안원태, 박명진 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1
Realtime Kinematic(RTK) method make decision to correct position by calculating correction value of rover and transmitting to rover data from GPS base station. However. this method has many problems as it required base station and rover. Also lots of time for setting, commit workers and many equipment were needed. Therefore, in this study, we made system using virtual reference station and analysed the accuracy of urban control point through VRS RTK method without limited time and distance. As result of this study, two control points were obtained with good results in expected accuracy, therefore it was good method for management of urban control point. Also, it was useful to reconstruct control point immediately and to build urban information system.
Yong-Seok Choi(Yong-Seok Choi),Min Gyeong Kim(Min Gyeong Kim),Jong-Ho Lee(Jong-Ho Lee),Joo-Yong Park(Joo-Yong Park),Sung-Weon Choi(Sung-Weon Choi) 대한구강악안면외과학회 2022 대한구강악안면외과학회지 Vol.48 No.5
Objectives: This study aimed to analyze the clinicopathological prognostic factors affecting the survival of patients with oral squamous cell carci-noma (OSCC). Materials and Methods: A retrospective study was conducted on patients with OSCC who received treatment at the Oral Oncology Clinic of the Na-tional Cancer Center (NCC) from June 2001 to December 2020. The patients’ sex, age, primary site, T stage, node metastasis, TNM staging, perineural invasion (PNI), lymphovascular invasion (LVI), differentiation, surgical resection margin, smoking, and drinking habits were investigated to analyze risk factors. For the univariate analysis, a Kaplan-Meier survival analysis and log-rank test were used. Additionally, for the multivariable analysis, a Cox proportional hazard model analysis was used. For both analyses, statistical significance was considered when P<0.05. Results: During the investigation period, 407 patients were received surgical treatment at the NCC. Their overall survival rate (OS) for five years was 70.7%, and the disease-free survival rate (DFS) was 60.6%. The multivariable analysis revealed that node metastasis, PNI, and differentiation were significantly associated with poor OS. For DFS, PNI and differentiation were associated with poor survival rates. Conclusion: In patients with OSCC, cervical node metastasis, PNI, and differentiation should be considered important prognostic factors for postop-erative survival.
Single and Competitive Isotherms of Phenol and o - Cresol by Pulsed - Input Method
Choi, Yong Seok,Lee, Ju Weon,Koo, Yoon Mo,Row, Kyung Ho,Choi, Dai Ki 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.6
There is a considerable industrial interest in both the scale-up and optimization of chromatographic operations used in the purification of fine chemicals and biomolecules. One of the major factors affecting the adsorption operation is the adsorption isotherm. Reversed-phase high-performance liquid chromatography (RP-HPLC) was used to measure the adsorption isotherm of phenol and o-cresol. From the experimental results, the retention times were decreased with increasing sample sizes, and the front of the peak was very stiff, so Langmuir adsorption isotherm was applied. Also Early-eluting component, phenol, in a mixture of the two components elutes faster than that in a pure component. Pulsed-injection method (PIM) was used to determine the two parameters of the Langmuir isotherm. The resulting parameters, a and b, were used to calculate the elution profiles of phenol and o-cresol in pure and mixed state. The agreement between the experimental data and calculated elution profiles was fairly good in a mixture as well as a pure component.
Theoretical and Experimental Considerations of Thermal Humidity Characteristics
Choi, Seok-Weon,Cho, Ju-Hyeong,Seo, Hee-Jun,Lee, Sang-Seol The Korean Society for Aeronautical and Space Scie 2002 International Journal of Aeronautical and Space Sc Vol.3 No.1
Thermal humidity characteristics were considered theoretically and experimentally. A Simply well-fitted correlation of a saturated vapor pressure-temperature curve of water was introduced based on Antoine equation to make theoretical prediction of relative humidity according to temperature variation. Characteristics of dew point were also examined theoretically and its relation with temperature and humidity was evaluated. The exact mass of water vapor in a specified humidity and temperature condition was estimated to provide useful insight into the idea about how much amount of water corresponds to a specified humidity and temperature condition in a confined system. A simple but well-fitting model of dehumidification process was introduced to anticipate the trend of relative humidity level during GN2(gaseous nitrogen) purge process in a humidity chamber. Well-suitedness of this model was also verified by comparison with experimental data. The overall appearance and specification of two thermal humidity chambers were introduced which were used to perform various thermal humidity tests in order to yield useful data necessary to support validity of theoretical models.
상향류 Bioflter를 이용한 하수처리시스템의 처리특성
최원석 ( Weon Seok Choi ),윤형석 ( Hyung Seok Yun ),조용현 ( Yong Hyun Cho ),한상윤 ( Sang Yun Han ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.5
Korea is currently classified as a water shortages countries, one of the most serious nations among the OECD countries experiencing water shortages, In the case of natural water resources, the temporal or spatial change of the quantity is very large, however reused treated wastewater is suitable for reuse due to its constant quantity throughout the year, Thus treatment characteristics study was performed treatment characteristics in IJBBP(Up-flow Biostyr Biofilter Process) in this study for reusing treated wastewater. The following conclusions can be drawn from the study: In the UBBP treatment characteristics, the results from operating UBBP indicated that the removal efficiency of CODcr was 40.8. 36.0. and 4.8 percent according to biofilter BFI. BF2 and SF3, respectively, therefore, the average removal efficiency of CODcr in whole system was XI .9 percent. Also, SS concentration of Influent was average 1 19.5mgIL and the effluent concentration was average I .4mglL, Therefore, the average removal efficiency was 98.7 percent during the study periods, SS removal efficiency was revealed 10 linear function in the IJBBP, DO concentration was increased to 6.6mglL in the SF1, and it was decreased to 5.Smg/L and 4.8mgfL in the SF2 and SF3, respectively. This phenomenon was caused by oxidation of organic matter and nitrification.