• 공학교육연구
• /
• 제8권1호
• /
• pp.5-19
• /
• 2005

이 논문은 삼척대학교 메카트로닉스 공학부에서 자동제어, 디지털제어, 마이크로 프로세서응용의 실습을 위해 사용되는 자기 부상실습장치의 설계와 제작에 관한 것이다. 이 장치는 MIT 대학의 설계에서 영감을 받아 개발되었으나, MIT의 장치가 아날로그형임에 비해 디지털형으로 개발하였다. 이 실습장치는 아날로그와 디지털 방식으로 동시에 제어하고 모니터할 수 있다. 더구나 부품의 가격은 MIT의 것과 비슷하거나 더 싼 편이다. 그리고 이 장치는 자기 홀 센서나 적외선 센서를 이용하여 제어할 수 있어서 학생들에게는 센서의 사용과 신호처리를 위한 다양한 경험을 얻을 수 있도록 되어있다. 이 설계는 저자들이 제작하여 시험해 보았으며, 학생들에게 실험 프로젝트 형식으로 제공될 것이다. 이 장치는 의도적으로 덜 보상되어지고, 적당한 수준까지만 조립된 상태에서 학생들에게 제공될 것이며, 학생들은 센서신호와 제어기의 성능을 분석한 후 보상기를 설계하고 센서의 신호를 처리할 것이 기대된다.

• 실천공학교육논문지
• /
• 제10권1호
• /
• pp.25-33
• /
• 2018

IT산업이 발달하면서 기존의 이론 교과목에서 머물러져 있던 이러닝 학습이 실습이 요구되는 교과목까지 영역이 확장되고 있다. 이러닝 학습에서 실습이 요구되는 교과목이 온라인 실습을 통해 학습성과가 있는지 평가돼야 한다. 본 연구에서는 사이버대학 메카트로닉스공학 학생들이 전공기초실습 교과목인 'PLC제어'교과목과 '전동기 서보제어'교과목을 이러닝에서 학습을 위해 '프라임칼리지(Prime College)의 사이버랩'을 통해 학습 성과가 있는지 조사하였다. 이를 위해 사이버랩 학습 운영을 진행하였고, 2년 동안 교과목을 수강한 학생에 대하여 5점 척도 설문과 취득성적을 통해 실습교과목의 대한 이러닝 교육의 효과가 상단부분 있음을 확인하였다.

• 공학교육연구
• /
• 제14권4호
• /
• pp.83-87
• /
• 2011

In this paper, the present state of the experiments in the mechanical engineering education is analyzed and the improving methods of the experimental education are presented. Data at twelve universities are collected. In spite of the general understanding of the importance of the experiments, the portion of the experiments is less than 10%. It shows the need to increase the experiments. Experiments for basic mechanics are fairly well performed, but experiments for applied subjects would be strengthened. Several improving methods such as systematic support for experiments, use of the exclusive assistants for experiments, and so on are discussed.

• 한국전기전자재료학회논문지
• /
• 제30권9호
• /
• pp.602-608
• /
• 2017

Due to recent industry 4.0, manufacturing has changed a lot. In particular, it is necessary to control the controller and controller of the control system, to communicate various production information and measurement information, and to produce a database in accordance with the flexible production for a small quantity of various items, and to manage the trend of major parts of production facilities. In this paper, we developed a multiple wireless communication controller for small scale control system for smart factory by applying XBee and microcomputer. This controller is cheap and easy to build multi-radio communication environment of 1: N and can control and monitor control system. In addition, we tested multiple wireless communication controllers by using signal processing device and C++, and constructed network, control, and database for mechanism module, and confirmed effectiveness for industrial application.

• 반도체디스플레이기술학회지
• /
• 제8권4호
• /
• pp.1-5
• /
• 2009

This investigation is applied Taguchi method and the analysis of variance(ANOVA) to the reactive ion etching(RIE) characteristics of $SiO_2$ film coated on a wafer with Experimental Analysis and Optimization of $CF_4/O_2$ Plasma Etching Process mixture. Plans of experiments via nine experimental runs are based on the orthogonal arrays. A $L_9$ orthogonal array was selected with factors and three levels. The three factors included etching time, RF power, gas mixture ratio. The etching rate of the film were measured as a function of those factors. In this study, the etching thickness mean and uniformity of thickness of the RIE are adopted as the quality targets of the RIE etching process. The partial factorial design of the Taguchi method provides an economical and systematic method for determining the applicable process parameters. The RIE are found to be the most significant factors in both the thickness mean and the uniformity of thickness for a RIE etching process.

• 한국정밀공학회지
• /
• 제31권2호
• /
• pp.165-170
• /
• 2014

Reproducibility of injection molding machines are studied at the study of this time. We applied computer aided engineering program so it could generate clamping force, about 1,500 kN, to the nozzle center part of flex link in tie-bar and at this time, we made sure condition of stress distribution and transformation quantity in flex link. The result of computer aided engineering transformation quantity was confirmed that transformation of top area was 247~257 kN and bottom areas was 273~279 kN and also was confirmed that the stresses are distributed in a range of 57~750 $N/mm^2$ from top to the bottom of the surface. This time we could confirm the condition of transformation quantity and stress distribution by enforcing the previously used structure analysis of flex link. And we utilized the reference data to establish important point of section for non destructive test overhaul.

• 반도체디스플레이기술학회지
• /
• 제10권4호
• /
• pp.139-144
• /
• 2011

CMP process is an essential element in the semiconductor product processes in Chemical Mechanical Polishing. Taken as a whole, CMP is one process, but concretely, it is a detail process which consists of polishing, cleaning, and so on. Especially, the polishing and cleaning are key points in the whole process. Polishing rate is the most important factor and is related with deposition of slurry in the polishing process. Each outlet velocities is the most important factors in cleaning process. And when the velocities are more uniform, the cleaning becomes more effective. In this research, based on these factors, we performed a numerical analysis for effective polishing and cleaning which can be applied to industrial field. Consequently, we figured out that more than one opened nozzle is more effective than one opened nozzle at the polishing pad in case of this research. And we confirmed that the revised models have the uniform velocity distribution more than the previous model of the cleaning nozzle.

• 반도체디스플레이기술학회지
• /
• 제19권1호
• /
• pp.36-41
• /
• 2020

In this paper, We need to change all print factors when which print scaffold with 400 ㎛ pore using FDM 3d printer. Therefore the print quantity is 10 billion times, So we are difficult to print on workplace. To solve the problem, we used the prediction model based machine learning regression. We preprocessed and learned the securing print condition data, and we produced different kinds of prediction models. We predicted the pore size of scaffolds not securing with new print condition data using prediction models. We have derived the print conditions that satisfy the pore size of 400 ㎛ among the predicted print conditions of pore size. We printed the scaffolds 5 times on the condition. We measured the pore size of the printed scaffold and compared the average pore size with the predicted pore size. We confirmed that error was less than 1%, and we were identify the model with the highest pore size prediction performance of scaffold.

• 반도체디스플레이기술학회지
• /
• 제12권2호
• /
• pp.19-25
• /
• 2013

Extrusion is one of the most important operations in the polymer-processing industry. Balancing the distribution of flow through a die to achieve a uniform velocity distribution is the primary objective and one of the most difficult tasks of extrusion die design. If the manifold in a coat-hanger die is not properly designed, the exit velocity distribution may be not uniform; this can affect the thickness across the width of the die. Yet, no procedure is known to optimize the coat hanger die with respect to an even velocity profile at the exit. While optimizing the exit velocity distribution, the constraint optimization used in this work with allowable pressure drop in the die; according to this constraint we can control the pressure in the die. The computational approach incorporates three-dimensional finite element simulations software STAR-CCM+. These simulations are used with numerical optimization to design polymer coat hanger dies with pressure drop, uniform velocity and temperature variation across the die exit.

• 비파괴검사학회지
• /
• 제36권1호
• /
• pp.9-17
• /
• 2016

The elastic modulus of a 3D-printed Kelvin foam plate is investigated by measuring the acoustic wave velocity of 1 MHz ultrasound. An isotropic tetrakaidecahedron foam with 3 mm unit cell is designed and printed layer upon layer to fabricate a Kelvin foam plate of 14 mm thickness with a 3D CAD/printer using ABS plastic. The Kelvin foam plate is completely filled with paraffin wax for impedance matching, so that the acoustic wave may propagate through the porous foam plate. The acoustic wave velocity of the foam plate is measured using the time-of-flight (TOF) method and is used to calculate the elastic modulus of the Kelvin foam plate based on acousto-elasticity. Finite element method (FEM) and micromechanics is applied to the Kelvin foam plate to calculate the theoretical elastic modulus using a non-isotropic tetrakaidecahedron model. The predicted elastic modulus of the Kelvin foam plate from FEM and micromechanics model is similar, which is only 3-4% of the bulk material. The experimental value of the elastic modulus from the ultrasonic method is approximately twice as that of the numerical and theoretical methods because of the flexural deformation of the cell edges neglected in the ultrasonic method.