• Title/Summary/Keyword: Dynamic Cutting Process

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Engineering design process of tight-fit sportswear using 3D information of dermatomes and skin deformation in dynamic posture (동적자세와 피부분절을 이용한 기능성 밀착의복 제작 프로세스)

  • Kim, So-Young;Hong, Kyung-Hi
    • Korean Journal of Human Ecology
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    • v.21 no.3
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    • pp.551-565
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    • 2012
  • The primary goal of this study was to provide a systematic methodology of utilizing 3D technology for tight-fit performance sportswear using information of skin deformation in various posture. Technical tools used in this study are Cyberware whole body scanner, RapidForm2004, 2C-AN 3D pattern development program, and YukaCAD. Analysis of the 3D skin deformation while knee joint was bent from $0^{\circ}$ to $60^{\circ}$ revealed that the length of dermatomes L4 was remained consistent during knee bending. Therefore, L4 was chosen as a major cutting line. To develop a highly ergonomic pattern, replicas of static and dynamic postures were developed and integrated using two methods, one is morphing method (Sqirlz Morph), and the other is AutoCAD. Experimental tight-fit garments called 'Derm-Mov Pattern' was designed using dematomes L4, L2, and inner line under knee and compared with four other patterns. As results, AutoCAD was appropriate as a integrating method of various postures. In wear test, 'Derm-Mov Pattern' was rated high (p < .001), in terms of pressure comfort especially around front crotch area. However, wear sensation was not signipicantly different in other area due to highly extensible property of materials. Pressure distribution was relatively even in these experimental garments.

10-Bit 200-MS/s Current-Steering DAC Using Data-Dependant Current-Cell Clock-Gating

  • Yang, Byung-Do;Seo, Bo-Seok
    • ETRI Journal
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    • v.35 no.1
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    • pp.158-161
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    • 2013
  • This letter proposes a low-power current-steering digital-to-analog converter (DAC). The proposed DAC reduces the clock power by cutting the clock signal to the current-source cells in which the data will not be changed. The 10-bit DAC is implemented using a $0.13-{\mu}m$ CMOS process with $V_{DD}$=1.2 V. Its area is $0.21\;mm^2$. It consumes 4.46 mW at a 1-MHz signal frequency and 200-MHz sampling rate. The clock power is reduced to 30.9% and 36.2% of a conventional DAC at 1.25-MHz and 10-MHz signal frequencies, respectively. The measured spurious free dynamic ranges are 72.8 dB and 56.1 dB at 1-MHz and 50-MHz signal frequencies, respectively.

Hybrid Type II fuzzy system & data mining approach for surface finish

  • Tseng, Tzu-Liang (Bill);Jiang, Fuhua;Kwon, Yongjin (James)
    • Journal of Computational Design and Engineering
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    • v.2 no.3
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    • pp.137-147
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    • 2015
  • In this study, a new methodology in predicting a system output has been investigated by applying a data mining technique and a hybrid type II fuzzy system in CNC turning operations. The purpose was to generate a supplemental control function under the dynamic machining environment, where unforeseeable changes may occur frequently. Two different types of membership functions were developed for the fuzzy logic systems and also by combining the two types, a hybrid system was generated. Genetic algorithm was used for fuzzy adaptation in the control system. Fuzzy rules are automatically modified in the process of genetic algorithm training. The computational results showed that the hybrid system with a genetic adaptation generated a far better accuracy. The hybrid fuzzy system with genetic algorithm training demonstrated more effective prediction capability and a strong potential for the implementation into existing control functions.

A Study on the Miniaturization of Angle Head Spindle Case for Cutting in Narrow Spaces (협소 공간 절삭가공용 앵글 헤드 스핀들 케이스 소형화에 대한 연구)

  • Sung, Chul Hoon;Han, Sung Gil;Kim, Sung Hoon;Song, Chul Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.6
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    • pp.98-105
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    • 2019
  • In order to improve the fuel economy and dynamic behavior of automobiles, the weight reduction tendency of automobile parts is obvious. Also, in order to maximize assembly and maintenance convenience, various parts are integrated and modularized. Multi-piece methods require many manufacturing processes and become a factor of lowering the strength of parts. It is advantageous to overcome the disadvantages by integrally manufacturing to reduce the processing steps and ensure the strength of the parts. However, when it is necessary to process in a narrow space inside the part, it is impossible to process with the existing spindle. The angle head spindle is only a component of a machine tool, but it is a core part that requires high technology and is highly utilizable in products requiring high precision machining. Therefore, various and continuous studies needs for angle head spindles in areas such as vibration absorption, operational safety, excellent dimensional stability, and strength. In this paper, we propose an optimal design for angle head spindle by performing structural analysis and shape optimization for angle head spindle gear and case.

Development of Wireless Measurement System for Bridge Using PDA and Fiber Optical Sensor (PDA와 광섬유 센서를 이용한 교량의 무선계측 시스템 개발)

  • Kwak, Kae-Hwan;Hwang, Hae-Sung;Jang, Hwa-Sup;Kim, Woo-Jong;Kim, Hoi-OK
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.13 no.1 s.53
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    • pp.88-96
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    • 2009
  • This study proposes a wireless measurement system that is a new safety management system by using an FBG sensor and a PDA. The sensor part has many advantages of implementing a wireless measurement system, and the study emploies an FBG-LVDT sensor, FBG-STRAIN sensor, FBG-TEMP sensor, and FBG-ACC sensor, using FBG sensors. Also, the study show a configuration of a signal process system for operating a wireless transmission system of FBG sensors applied to the signal process system, and engrafted the cutting edge information technology industry in order to display from a remote distance using a PDA. In order to verify the applicability of the developed FBG sensors and wireless measurement monitoring system to the field, their accuracy, and usability, the study has conducted a static and dynamic test to a bridge in the field. The study made an assessment of service for the vibration of the bridge by applying dynamic data measured by an FBG-LVDT sensor and FBG-ACC sensor to Meister's curve and prepared methods for assessing the vibration of the bridge by proposing a standard of vibration limitation given the service of vibration of the bridge. As a follow up for this study, it would be necessary to set up an overall model for the standard of service assessment established in this study.

Case Study on the Failure Causes of Gneiss Slope Occurred Tension Crack (편마암비탈면에서 인장균열 파괴원인 사례 연구)

  • Chun, Byungsik;Noh, Insoo;Kong, Jinyoung;Kim, Juhyong
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.11
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    • pp.27-35
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    • 2012
  • The discontinuity of rock is one of important elements that have impact on the dynamic movement of rock. A slope made of gneiss has complicated geological structure because of the gneiss forming process through metamorphism covering wide range and the anisotropic structure with foliation. In this study, before cutting slope, the rock of slope had been found as a good quality by the boring test. But during construction tension cracks had occurred in the section with 170m length during large-scale excavation work with depth more than 20m. Ground surface geological investigation, boring exploration, resistivity logging and borehole image processing had been done to find the causes of the tension crack. It was possible to estimate the scale of fault existing in large area through resistivity logging and geological investigation. Large scale slickenside and fault clay had been found as the result of comprehensive analysis.

The Analysis of a Cerrobend Compensator and a Electronic Compensator Designed by a Radiation Treatment Planning System (방사선치료계획장치로 설계된 Cerrobend 선량보상체와 전자 선량보상체의 제작 및 특성 분석)

  • Nah Byung-Sik;Chung Woong-Ki;Ahn Sung-Ja;Nam Taek-keun;Yoon Mi-Sun;Song Ju-Young
    • Progress in Medical Physics
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    • v.16 no.2
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    • pp.82-88
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    • 2005
  • In this study, the physical compensator made with the high density material, Cerrobend, and the electronic compensator realized by the movement of a dynamic multileaf collimator were analyzed in order to verify the properness of a design function in the commercial RTP (radiation treatment planning) system, Eclipse. The CT images of a phantom composed of the regions of five different thickness were acquired and the proper compensator which can make homogeneous dose distribution at the reference depth was designed in the RTP. The frame for the casting of Cerrobend compensator was made with a computerized automatic styrofoam cutting device and the Millennium MLC-120 was used for the electronic compensator. All the dose values and isodose distributions were measured with a radiographic EDR2 film. The deviation of a dose distribution was $\pm0.99 cGy\;and\;\pm1.82cGy$ in each case of a Cerrobend compensator and a electronic compensator compared with a $\pm13.93 cGy$ deviation in an open beam condition. Which showed the proper function of the designed compensators in the view point of a homogeneous dose distribution. When the absolute dose value was analyzed, the Cerrobend compensator showed a $+3.83\%$ error and the electronic compensator showed a $-4.37\%$ error in comparison with a dose value which was calculated in the RTP. These errors can be admtted as an reasonable results that approve the accuracy of the compensator design in the RTP considering the error in the process of the manufacturing of the Cerrobend compensator and the limitation of a film in the absolute dosimetry.

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