• Title/Summary/Keyword: Scratch test

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Comparison study acupuncture treatment with Acupuncture & Moxibustion combined treatment for frozen shoulder patients (오십견 환자의 침 치료군과 뜸 병용치료군 간의 임상적 비교 고찰)

  • Kim, Young-Il
    • Journal of Haehwa Medicine
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    • v.15 no.2
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    • pp.1-7
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    • 2006
  • Objectives : Comparison acupuncture treatment with Acupuncture & Moxibustion combined treatment for frozen shoulder 20 case patients Methods : Efficacy evaluation using Apley scratch test(ROM), Martin.A.N'Improvement rate Results : 1. Acupuncture & Moxibustion combined treatment group were better than acupuncture treatment group in Martin.A.N' Improvement rate. 2. Acupuncture & Moxibustion combined treatment group were better than acupuncture treatment group in Apley scratch test(ROM). but this study need to many case frozen shoulder investigation.

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Effects of plasma Immersion ion Implanted and deposited layer on Adhesion Strength of DLC film

  • Yi Jin-Woo;Kim Jong-KuK;Kim Seock-Sam
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2004.11a
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    • pp.301-305
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    • 2004
  • Effects of ion implantation on the adhesion strength of DLC film as a function of ion doses and implanted energies were investigated. Ti ions were implanted on the Si-wafer substrates followed by DLC coating using ion beam deposition method. Adhesion strength of DLC films were determined by scratch adhesion tester. Morphologies and compositional variations at the different ion energies and doses were observer by Laser Microscope and Auger Electron Spectroscopy, respectively. From results of scratch test, the adhesion strength of films was improved as increasing ion implanted energy, however there was no significant evidence with ion dose.

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Quantitative Evaluation of Scratch Behavior for Polymeric Materials (고분자 소재의 스크래치 거동의 정량적 평가)

  • Baek, Ki-Wan;Lee, Sung-Goo;Lee, Jae-Heung;Choi, Kil-Yeong;Weon, Jong-Il
    • Polymer(Korea)
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    • v.33 no.4
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    • pp.273-283
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    • 2009
  • Recent research issues on the scratch behaviors of polymeric materials has been investigated. In this study, the scratch characterization of polymeric materials with respect of experimental parameters, such as nature of the material, temperature, applied load, test speed, surface treatment, scratch number of times, polymer structure/functional groups, degree of cross-linking, and crystallinity, are reviewed. In addition, the testing standards and methodologies which could quantify the scratch behaviors are introduced and the current international standards are compared and summarized. The latest technical approaches for evaluating the scratch behaviors and improving the scratch resistance of polymers are also discussed.

Design & development of a device for thin-film evaluation using a two-component loadcell (2축 로드셀을 이용한 박막평가장치의 설계 및 개발)

  • Lee, Jeong-Il;Kim, Jong-Ho;Park, Yon-Kyu;Oh, Hee-Geun
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1448-1452
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    • 2003
  • A scratch tester was developed to evaluate the adhesive strength at interface between thin-film and substrate(silicon wafer). Under force control, the scratch tester can measure the normal and the tangential forces simultaneously as the probe tip of the equipment approaches to the interface between thin-film and substrate of wafer. The capacity of each component of force sensor is 0.1 N ${\sim}$ 100 N. In addition, the tester can detect the signal of elastic wave from AE sensor(frequency range of 900 kHz) attached to the probe tip and evaluate the bonding strength of interface. Using the developed scratch tester, the feasibility test was performed to evaluate the adhesive strength of thin-film.

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Study on the Thermal Properties of the Electroless Copper Interconnect in Integrated Circuits (집적회로용 무전해도금 Cu배선재료의 열적 특성에 관한 연구)

  • 김정식;이은주
    • Journal of the Microelectronics and Packaging Society
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    • v.6 no.1
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    • pp.31-37
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    • 1999
  • In this study, the thermal property and adhesion of the electroless-deposited Cu thin film were investigated. The multilayered structure of Cu /TaN /Si was fabricated by electroless-depositing the Cu thin layer on the TaN diffusion barrier which was deposited by MOCVD on the Si substrate. The thermal stability was investigated by measuring the resistivity as post-annealing temperature for the multilayered Cu /TaN /Si specimen which was annealed at atmospheres of $H_2$and Ar gases, respectively. The adhesion strength of Cu films was evaluated by the scratch test. The adhesion of the electroless-deposited Cu film was compared with other deposition methods of thermal evaporation and sputtering. The scratch test showed that the adhesion of electroless plated Cu film on TaN was better than that of sputtered Cu film and evaporated Cu film.

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Evaluation of Scratch Characteristics of Diaphragm for Application of Hydrogen Compressor Parts

  • Sung-Jun Lee;Chang-Lae Kim
    • Tribology and Lubricants
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    • v.39 no.5
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    • pp.212-215
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    • 2023
  • Diaphragm compressors play a crucial role in safely compressing large volumes of high-purity hydrogen gas without contamination or leakage, thereby ensuring quality and reliability. Diaphragm compressors use a thin, flat, triple-layered diaphragm plate that is subjected to repetitive piston pressure for compression. They are usually made of metallic materials such as stainless steel or Inconel owing to their high-pressure resistance. However, since they are consumable components, they fail due to fatigue from repetitive pressure and vibration stress. This study aims to evaluate the scratch characteristics of diaphragms in operational environments by conducting tests on three different samples: Inconel 718, AISI 301, and Teflon-coated AISI 301. The Inconel 718 sample underwent a polishing process, the AISI 301 sample used raw material, and the Teflon coating was applied to the AISI 301 substrate at a thickness of 50 ㎛. To assess the scratch resistance, reciprocating motion friction tests were performed using a tribometer, utilizing 220 and 2000 grit sandpapers as the counter materials. The results of the friction tests suggested that the Teflon-coated sample exhibited the lowest initial friction coefficient and consistently maintained the lowest average friction coefficient (0.13 and 0.11 with 220 and 2000 grit, respectively) throughout the test. Moreover, the Teflon-coated diaphragm showed minimal wear patterns, indicating superior scratch resistance than the Inconel 718 and AISI 301 samples. These findings suggest that Teflon coatings may offer an effective solution for enhancing scratch resistance in diaphragms, thereby improving compressor performance in high-pressure hydrogen applications.

A Complementary Approach of Three Methods for Computational Thinking Assessment (컴퓨팅 사고력 평가를 위한 3가지 상호보완적 접근 방안)

  • Choi, Hyungshin;Kim, Mi Song
    • Journal of The Korean Association of Information Education
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    • v.21 no.6
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    • pp.639-646
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    • 2017
  • As computational thinking(CT) is gaining focus as a key 21st century skill much attention has been paid to promoting CT through software education. However, more studies are needed to design and implement effective CT assessment methods. This study aims to investigate the effects of three CT assessment methods in a course designed to enhance CT competencies of 52 pre-service teachers with a non-computer science background during one semester. To analyze pre-service teachers' CT competencies, we used 3 CT assessment methods: (1) pre-and post-testing based on Bebras computational thinking challenge questions, (2) Dr. Scratch to analyze group scratch projects automatically, and (3) scratch exam designed in this study to evaluate the development of CT. Our results show the positive effects of integrating assessment methods for promoting CT competencies. We end this paper with the discussion of advantages and implications of this integration.

Design of Line Scratch Detection and Restoration Algorithm using GPU (GPU를 이용한 선형 스크래치 탐지와 복원 알고리즘의 설계)

  • Lee, Joon-Goo;Shim, She-Yong;You, Byoung-Moon;Hwang, Doo-Sung
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.4
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    • pp.9-16
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    • 2014
  • This paper proposes a linear scratch detection and restoration algorithm using pixel data comparison in a single frame or consecutive frames. There exists a high parallelism in that a scratch detection and restoration algorithm needs a large amount of comparison operations. The proposed scratch detection and restoration algorithm is designed with a GPU for fast computation. We test the proposed algorithm in sequential and parallel processing with the set of digital videos in National Archive of Korea. In the experiments, the scratch detection rate of consecutive frames is as fast as about 20% for that of a single frame. The detection and restoration rates of a GPU-based algorithm are similar to those of a CPU-based algorithm, but the parallel implementation speeds up to about 50 times.

Improvement in Tensile Strength, Scratch Resistance and Tribological Performance of Cu-based Bimetals by Surface Modification Technology (표면개질 기술에 의한 Cu 기반 바이메탈의 인장강도, 스크래치 저항성 및 트라이볼로지 성능 향상)

  • Karimbaev, R.;Amanov, A.
    • Tribology and Lubricants
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    • v.37 no.3
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    • pp.83-90
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    • 2021
  • In this study, an ultrasonic nanocrystal surface modification (UNSM) was used to improve the mechanical properties, scratch resistance and tribological performance of Cu-based bimetals, which are usually used to manufacture sliding bearings and bushings for internal combustion engines (ICEs). Two different Cu-based bimetals, namely CuPb10Sn10 and CuSn10Bi7, were sintered onto a low carbon steel substrate. The mechanical properties and dry tribological performance using a tensile tester and micro-tribo tester were evaluated, respectively. The scratch resistance was assessed using a micro-scratch tester at an incremental load. The tensile test results showed that the yield strength (YS) and ultimate tensile strength (UTS) of both Cu-based bimetals increased after UNSM. Furthermore, the scratch and tribological tests results revealed that the scratch resistance and tribological performance of both Cu-based bimetals were improved by the application of UNSM. These improvements were mainly attributed to the eliminated pores, increased hardness and reduced roughness after UNSM. CuSn10Bi7 demonstrated better mechanical properties, scratch resistance and tribological performance than CuPb10Sn10. It was found that the presence of Bi in CuSn10Bi7 formed a Cu11Bi7 intermetallic phase, which is harder than Cu3Sn. Hence, CuSn10Bi7 demonstrated higher strength and wear resistance than CuPb10Sn10. In addition, a CuSn10Bi7 formed both SnO2 and Bi2O3 that prevented adhesion and improved the tribological performance. It can be expected that under dry tribological conditions, ICEs can utilize UNSM bearings and bushings made of CuSn10Bi7 instead of CuPb10Sn10 under oil-lubricated conditions.

A Study on the Effectiveness of CT-TDPS Learning Model in Problem Solving Programming using Scratch (스크래치를 이용한 문제해결 프로그래밍에서 CT-TDPS 학습 모형의 효과성 연구)

  • Kim, Young-Jik;Kim, Seong-Sik
    • The Journal of Korean Association of Computer Education
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    • v.23 no.3
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    • pp.41-47
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    • 2020
  • Computational Thinking(CT) is drawing attention as a core competency required for future talent in the 21st century. Software education for improving CT ability at home and abroad is in full swing. Among them, problem-solving programming education helps to improve CT ability. The CT-TDPS learning model follows the decomposition, abstraction thinking process, which modularizes complex problems, and the Agile development method, which is an iterative and incremental programming method to implement it. In this study, we tried to confirm the improvement of CT ability by applying CT-TDPS learning model to problem solving programming education using Scratch. As a result of the study, it was confirmed that in the problem solving programming education using the CT-TDPS learning model, it improved in all aspects of computing concept, computing performance, and computing perspective, which are sub-factors of CT ability. In addition, it was confirmed that there was a significant difference in the experimental group as a result of the t-test on the Dr.Scratch automatic evaluation result.