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Adaptive Neuro-Fuzzy Inference System for Prediction of Pile Setup
전종구,이송 한국지반공학회 2009 international journal of geo-engineering Vol.1 No.1
The evaluation of time dependent increase in pile capacity (setup) may lead to more economical design of pile foundations. This paper presents an Adaptive Neuro Fuzzy Inference System (ANFIS) to predict pile setup. A database of field dynamic tests is developed from the review of literature and selected input variables include soil type, roughness volume of pile shaft, pile diameter, pile length, time after pile installation, and initial effective stress at pile tip. Ultimate pile capacity at the beginning of restrike is evaluated by adding pile capacity at end of drive to the pile capacity increase predicted by ANFIS. The results of this study indicate that ANFIS provide predictions that are better than those from empirical methods, and can serve as a reliable and simple predictive tool for the prediction of pile setup. The evaluation of time dependent increase in pile capacity (setup) may lead to more economical design of pile foundations. This paper presents an Adaptive Neuro Fuzzy Inference System (ANFIS) to predict pile setup. A database of field dynamic tests is developed from the review of literature and selected input variables include soil type, roughness volume of pile shaft, pile diameter, pile length, time after pile installation, and initial effective stress at pile tip. Ultimate pile capacity at the beginning of restrike is evaluated by adding pile capacity at end of drive to the pile capacity increase predicted by ANFIS. The results of this study indicate that ANFIS provide predictions that are better than those from empirical methods, and can serve as a reliable and simple predictive tool for the prediction of pile setup.
고등학교 공업교과 트랜지스터 단원에 관한 CAI 개발과 그 학습 효과에 관한 연구
전종구(Jong Gu Jeon),최완식(Won Sik Choi) 대한공업교육학회 1997 대한공업교육학회지 Vol.22 No.1
The purposes of this study were: 1) to develop a courseware about "Transistor" lesson unit, 2) to determine if learning ability of the lesson unit with the courseware is better than that of the traditional lesson without the courseware, and 3) to determine if the attitude in learning the lesson unit with the courseware is different from or is better than that in learning the lesson without the courseware. Subjects were 86 general high school students participated in 50 minutes lesson of "The Transistor" unit for the courseware applied experimental group and 80 minutes lesson of the unit for the control group to which the traditional class lecture mode was applied. The class examination was used as an instrument. Followings were the major findings of this study. (1) The students who had learned the lesson with the courseware showed slightly higher learning abilities of the lesson than the students learned through the traditional method did. (2) when the students were divided into two levels (high level for the students who had more than the average score on the class examination and low level for the students who had less than the average score on the exam), the different results were found in the two groups. For the low level students, the courseware applied experimental group showed quite higher learning abilities of the lessons than the control group did. For the high level students, on the other hand, there was statistically no significant difference between the two groups. This result, like other research, supports the importance of the low level students` effectiveness in a courseware. (3) The attitude of learning the lesson unit is different each other between two groups. In a sense of an average score of the attitude, the courseware experimental group had higher attitude score than the control group had.
전명석,전종구 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.2
A polyelectrolyte chain confined in a slit nanochannel exhibits a structural transition from the one in free space. In this paper, the effect of the long-range electrostatic interactions between the xanthan polyelectrolyte and the slit wall on the confined xanthan conformation is investigated via the Brownian dynamics simulation. A neutral and two negatively charged surfaces of polydimethylsiloxane (PDMS) and glass are combined to make four kinds of slit channels with different charge characteristics: i) neutral-neutral, ii) glass-glass, iii) neutral-PDMS and iv) neutral-glass walls. Their walls are characterized by uniform surface charge densities determined from experimental data of zeta potential. Both the nonmonotonic chain size variation and the loss of long-range bond vector correlation, previously observed under confinement in the PDMS-PDMS slit, are also found in the neutral slit, demonstrating the nonelectrostatic origin of such crossover behaviors. As expected, the effect of wall charges is negligible at sufficiently high medium ionic strength of 100 mM but it becomes significant in the opposite limit of 0.01 mM. In the latter case, the high charge density of glass walls strengthens the effective confinement of a negatively charged polyelectrolyte and produces a xanthan structure comparable to that confined in a much narrower neutral slit. The obtained structural data suggest the possibility of controlling the structure of confined polyelectrolytes by the modification of surface charge characteristics of micro/nanofluidic devices in combination with the adjustment of the medium ionic strength.