• Journal of the Korean Society of Industry Convergence
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• v.22 no.6
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• pp.627-635
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• 2019

In this study, we developed for processing complex features using CAM software that satisfies precision for example practice and related qualification tests suiTable for CNC training purposes. In addition, functions such as location control, speed control, and processing path generation, which are the main functions of CNC machining machines, were constructed using small equipment parts, servo motors, inverters, general purpose PCs, and commercial NC software and researched with the goal of developing low-cost education equipment. In the static accuracy inspection, the degree of machine when measuring the parallelism of the X, Y and Z axes and the vibration of the main shaft did not reach the allowable value. However, we have obtained a finished product that satisfies the CNC machine book sample shape machining, detailed functions of the position control function of the CNC machine tool, linear interpolation function, circular interpolation function, and tool offset function. In the qualification test shape processing, a shape with a degree of 1/100 mm was processed to obtain position accuracy that satisfied the tolerance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.344-349
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• 1999

As the computing environment in a typical organization has changed rapidly an Internet-connected client/server system, new tools to measure the utilization of such system are becoming increasingly important. Most of contemporary performance measuring tools are based on the old computing models, such as the centralized server model or the networked server model. In this paper, we present a tool, railed SysWatcher, which is based on the latest computing paradigm.. What is to be analyzed in the new computing environment and flow can achieve it by using SysWatcher, as well as its detailed design concept, are presented.

• Journal of the East Asian Society of Dietary Life
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• v.4 no.1
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• pp.1-18
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• 1994

This study is designed to delve into the measuring systems of different periods so as to help with more exact representations of cultures of different periods. The basis of the measuring system in china stems from the huangjong (Huangzhong : the yellow bell) of the period of Huangdi, the length of the bell being the width of 90 black millet grains. Do (Du : width) ; 1 bun=the width of one black millet grain, 1 Chon=10 Buns, 1 Chuk=10 Chons, 1 Jang=10 Cheoks, 1 In=10 Jangs. Ryang (Lyang : volume) ; 1 Yak=the weight of 1,200 grains in the yellow bell, 1 Hab=2 Yaks, 1Seung=10 habs, 1 Du=10 Seungs, 1 Gok=10 Dus. Hyung (Hung : weight) ; 12 Jus=the weight of 1 Yak, 1Yang=24 Jus are equal 1 Hab in weight, 1 Geun=16 Ryangs, 1 Jo=30 Geuns, 1 Seo=4 Jo. In the era of Eun (In) it was decided that the 9-chon length of the Yellowbell shall be 1 Cheok. The Cheok of Ju was set at 4/5 of the length of the yellow bell. The Cheok of Ju breaks into Yongjocheok, Joryegicheok, Pogeumcheok. Yongjocheok, arising from Rohbancheok of the Ju period, is part of Gokcheok also used as a measuring tool for wooden works. The Han cheok has the same length as the yellow bell. The Sang Cheok is 4/5 of the length of the yellow bell. The Tang Cheok was originally the same as the Sang cheok but became longer and longer to be the Long cheok (31.3cm). The length-measuring system used in the three-nation era of Korea includes the gijeom cheil (35.52cm), Ju cheok (25.45cm), sunje Cheok (23.5cm), the Long Tang Cehok (29.706 cm), making 10 Bun 1 Chon and 10 Chon 1 Cheok. The volume-measuring system(Seung) was 198.81 ㎤ before 681 BC in the shilla Dynasty and was 596.42 ㎤ after that. In the seventh year of Kng Munjong of the Koryo dynasty the standard measuring system with the Long Tang Cheok as its basis was adopted, and the standard volume-measuring tools were used under the name of Migok, Daesodugok, Mijangdu, (29.706 cm), making 10 Bun 1 Chon and 10 Chon 1 Cheok. The volume-measuring system(Seung) was 198.81㎤ before 681 BC in the shilla dynasty and was 596.42 ㎤ after that. In the seventh year of King Munjong of the Koryo dynasty the standard measuring system with the Long Tang Cheok as its basis was adopted, and the standard volume-measuring tools were used under the name of Migok, Daesodugok, Kijangdu, Habseung and gokseok. The 1 Seung volumes of theses toolas were 596,447,927 and 1053㎤, respectively. were called Migok, Daesodugok, Mijangdu, Habseung and Gokseok, being respectively 596,447,927, 1053 ㎤, respectively. In the Chosun Dynasty the length of the Yeongjocheos was 27.6 cm or 31.220 in the Sejong era, 29.8 from Heonjong through Gojong, and 30.3 cm after the 6th year of King Kwangmu, and the volume of Du(Mal) also changed like 4.121 or 5.964, 5.187, 23.08 $\ell$, and the 1-Jeonjung also changed like 2.66 or bout 4, 3.45, 3.75 in line with the changes of the length system.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.04a
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• pp.256-261
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• 1992

Acquisition of 3D points is an essential process for modelling of physical 3D objects. Although Coordinate Measuring Machine(CMM) is most accurate for this purpose, it is very time consuming. To enhance the data aquisition speed for scuptured surfaces, active vision with reflecctometric method was used for our system. A fter the data acquisition, the system automatically generates cutting tool path for the 3-axis milling of the object. The fullyintegrated system from the data acquisition to the NC-code generation was implemented with IBN-PC/386 and necessary hardwears.

• Journal of Multimedia Information System
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• v.2 no.3
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• pp.255-262
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• 2015

The modern manufacturing systems and technologies produce products that are more accurate day by day. This can be reached mainly by improvement the manufacturing process with at the same time restricting more and more the quality specifications and reducing the uncertainty in part. The main objective an industry becomes to lower the part's variability, since the less variability - the better is product. One of the part of this task is measuring the object's uncertainty. The main purpose of this study is to understand the application of bootstrap method for uncertainty evaluation. Bootstrap method is a collection of sample re-use techniques designed to estimate standard errors and confidence intervals. In the case study a surface of an automobile engine block - (Top view side) is measured by Coordinate Measuring Machine (CMM) and analyzed for uncertainty using Geometric Least Squares in complex with bootstrap method. The designed experiment is composed by three similar measurements (the same features in unique reference system), but with different points (5, 10, 20) concentration at each level. Then each cloud of points was independently analyzed by means of non-linear Least Squares, after estimated results have been reported. A MatLAB software tool used to generate new samples using bootstrap function. The results of the designed experiment are summarized and show that the bootstrap method provides the possibility to evaluate the uncertainty without repeating the Coordinate Measuring Machine (CMM) measurements many times, i.e. potentially can reduce the measuring time.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1144-1149
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• 2003

It is very important to measure circular motion accuracy of NC lathes it affects accuracy, performance, interchange ability and quality of machine parts machined by the NC lathes in industries. So, in this study, measuring units system to measure circular motion accuracy two axes circular motion accuracy of NC lathes was composed of two optical linear scales installed on the z and x-axes of work coordinate system on NC lathe and a computer inserted with PC counter card enables to obtain measuring data. Here, ATC(Automatic Tool Changer) and moving part of linear scales are fixed with magnet bases in order to measure circular motion accuracy of the ATC of NC lathe. And next, computer software was developed in order to measure the circular motion accuracy of NC lathe under resolution of 0.1 $\mu\textrm{m}$ using two linear scales, and also computer softwares were developed so that measuring data could be modeled on plots and be analyzed numerically,

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.247-252
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• 2004

Developed shape awareness technology and vision technology for optical ten slant in this research and including external form state of lens for the performance verification developed so that can be good achieve badness finding. And, establish to existing reflex data because inputting surface badness degree of scratch's standard specification condition directly, and error designed to distinguish from product more than schedule error to badness product by normalcy product within schedule extent after calculate the error comparing actuality measurement reflex data md standard reflex data mutually. Developed system to smallest 1pixel unit though measuring is possible 1pixel as 3.7$\mu\textrm{m}$${\times}$3.7$\mu\textrm{m}$(0.1369${\times}$10/sub-1/$\textrm{mm}^2$) the accuracy to 10/sub-1/mm minutely measuring is possible performance verification and trust ability through an experiment prove.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.13 no.3
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• pp.44-52
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• 2004

This paper proposed a error compensation methodology for three-DOF translational parallel manipulator. The proposed method uses CMM (coordinate measuring machine) as metrology equipment to measure the position of end-effector. To identify the transform relationships between the coordinate system of the parallel manipulator and the CMM coordinate system, a new coordinate referencing (or coordinate system identification) technique is presented. By using this technique, accurate coordinate transformation relationships are efficiently established. According to these coordinate transformation relationships, an equation to calculate the compensating error components at any arbitrary position of the end-effector is derived. In this paper, Monte Carlo simulation method is applied to simulate the compensation process. Through the simulation results, the proposed error compensation method proves its effectiveness and feasibility.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1997.04a
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• pp.119-124
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• 1997

This study investigates EAD/EAM system & component technology in die making for automobile, An assessment has been proceeded so that stamping car panel can be designed and manufactured efficiently. Also a method of measuring surface strains in a deformed three dimensional part has been analyzed which computes surface strains for the entire area under the view instead of determining surface strains from deformed circles one a time. For the technicians sutomated strain measurement system has the potential to become a powerful tool for successful press-die design and making. The obtained results will lead to the reductions in lead time and man-hour required for the design and manufacture of the stamping dies.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.838-841
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• 2000

To improve the accuracy of products and improve the product quality, we need to enhance the machining accuracy of the machine tools. To this point of view, measurement and inspection of finished part as well as error analysis of machine tools has been studied for last several decades. OMM(On the Machine Measurement) has been issued to alternate with CMM, pointing out disadvantages of high expenses and lots of setting time in CMM. In this paper, we study 1) the spherical surface manufacturing by volumetric error compensation of machine tool, 2) the system development of OMM without detaching work piece from a bed of machine tool after working. 3) the generation of the finished part profile by On the machine measurement. Furthermore, the output of OMM is compared with that of CMM, and verified the feasibility of the measurement system.