• Title/Summary/Keyword: 스퀵

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Effects on Metacognition and GALT Logical Thinking Ability in Programming Educations using Squeak e-toy (스퀵 e-toy 프로그래밍 교육을 통한 메타인지 및 GALT 논리 사고력 향상 효과 분석)

  • Jong, You-Rim;Hur, Kyeong
    • Journal of The Korean Association of Information Education
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    • v.14 no.2
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    • pp.199-207
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    • 2010
  • This paper is proposed to present elementary algorithmic thinking-based Squeak E-toy programming problems for flowchart-based programming educations without programming languages in elementary programming educations. Furthermore, this paper proves the validity and effects of developed Squeak E-toy programming problems through measurement analyses of metacognition and GALT logical thinking ability experiments by comparing with the language-based traditional programming education.

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Comparison on How Much Dolittle and Squeak Languages Influence Improving Elementary Students' Logical Thinking Capability (두리틀과 스퀵 언어가 초등학생의 논리적 사고력 신장에 미치는 영향 비교)

  • Kim, Young-Ae;Lee, Bong-Kyoo;Kim, Byung-Soon
    • Journal of Digital Contents Society
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    • v.10 no.3
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    • pp.375-380
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    • 2009
  • Computer programming education can improve students' logical thinking and problem-solving ability. Therefore, it is essential tool to improve algorithmic thinking ability. We study how much Dolittle and Squeak influences improving elementary students' logical thinking ability. Thus, we divided 6th grade elementary students into two classes and then taught Dorittle and Squeak programming languages for 6 weeks, respectively. We compare and analyze each logical thinking ability and its sub-classifications. The results showed that Dorritle affects significant improvement, but not Squeak.

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Development of Rattle and Squeak Detection Methodology Considering Characteristics of Road Vibration Input (차량 부품의 노면 가진 특성을 고려한 래틀과 스퀵 현상 검출 방법의 개발)

  • Lyu, Su Jung;Jun, In Ki;Choi, Jae Min;Lee, Won Ku;Woo, Jae Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.5
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    • pp.679-683
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    • 2013
  • BSR noise emerges in a vehicle as a result of road vibrations, engine vibrations, and speaker vibrations. BSR noise occurs with an irregular impact or stick slip friction phenomenon as the influence of the resonance mode when the vibration input load is transferred along poor joint and contacting pairs of the system. A sub-structure method of finite element analysis is required to detect impacts and slip in the full vehicle model. This study presents a method for sub-structure modeling and a rattle and squeak detection methodology that considers the characteristics of road vibration inputs.

Experimental Evaluation of Buzz, Squeak and Rattle Noise of Vehicle Doors and Its Prevention (자동차 도어의 BSR 소음의 실험적 평가와 개선)

  • Shin, Su-Hyun;Cheong, Cheol-Ung;Jung, Sung-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.617-621
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    • 2007
  • Recent advances in automotive noise control engineering have reduced major sound sources in the vehicle, customers perceive Buzz, Squeak and Rattle (BSR) as one of important indicators of vehicle quality and durability. As the long-term goal, we expect to establish the integrated design cycle for the reduction of BSR noise in the early stage of development, which consist of design, prediction, and evaluation procedures. This is possible only with great bulk of experimental data for BSR noise. In this paper, BSR noise is experimentally identified for vehicle doors, which have been traditionally considered as one of main sources of BSR noise. Based on this result, we proposed method for the prevention of BSR noise in the vehicle doors.

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An Experimental Approach and Improvement of Buzz, Squeak and Rattle Noise from a Seat (차량 시트의 BSR Noise에 대한 시험적 고찰 및 개선)

  • Jeon, Jun-Sig;Kim, Byung-Hoon;Bang, Byung-Ju;Jang, Ik-Guen;Ji, Sung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.675-679
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    • 2006
  • Today, the interior noise perceived by the occupants is an important factor in the design of automotive interior assemblies. Buzz, Squeak and Rattle Noises in a Seats are one of the major concerns mentioned above. In this study, the terms 'Buzz, squeak and rattle' were defined as the noise originating from structural vibrations in an assembly. And, the BSR noise of vehicle seat was investigated and the improvement of BSR noise level was confirmed though the structural treatment based on the structural analysis results from the modal and sound intensity of seat.

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Tilting Effect of Automotive Seat System on Squeak Noise (자동차 시트 틸팅 각도에 따른 기어박스 마찰소음 영향도)

  • Kang, Jae-Young
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.6
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    • pp.577-582
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    • 2010
  • The squeak propensity in the gear box of an automotive seat system is investigated analytically. The mating parts in the gear box are the lead screw and the nut, where the friction stresses are exerted on the thread of the screw. The lead screw is modeled as a circular beam allowing the bending and torsional vibrations. In the system, the lead screw converts rotating to translating motion so that it moves the automotive seat slightly tilted on the floor. The tilting angle is considered one major parameter in this study. Therefore, the equations of motion associated with the non-conservative friction force are derived with the inclusion of the tilting angle. It is found that the squeak noise corresponds to the several bending modes of the lead screw and its propensity is increased by the tilting angle of the seat.

Assessment of BSR Noise in a Vehicle Cabine (자동차 실내 BSR 소음의 정량적 평가)

  • Shin, Su-Hyun;Kim, Duck-Whan;Lee, Gwang-Se;Choi, Young-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.04a
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    • pp.662-663
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    • 2014
  • In most vehicle manufactures have traditionally relied on find-fix method of human auditor, mainly due to variation excitation source. To solve the BSR noise, the requirements for BSR test are presented in terms of detection of noise source, analysis of time-frequency and sound pressure, sound quality for noise. A number of new technology direction, particularly in the field of noise source identification application and psycho-acoustics from the Zwicker's sound quality parameter, the computed objective sound metrics and subjective jury test result.

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Evaluation of BSR Noise Properties of Instrument Panel in a Vehicle (자동차 계기판 BSR 소음특성 평가)

  • Shin, Su-Hyun;Cheong, Cheol-Ung;Kim, Duck-Whan;Jung, Sung-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2010.05a
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    • pp.330-331
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    • 2010
  • In this paper, BSR noise from an instrument panel of a vehicle are investigated with integrated experimental methods. First, potential source regions of the instrument panel for BSR are localized by using the module-excitor and near-acoustic field visualization system. Then, subjective evaluation of BSR nosie from the detected potential noise source regions is made with the Zwicker's loudness and time-varying loudness methods.

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Evaluation of BSR Noise Properties of Instrument Panel in a Vehicle (자동차 계기판 BSR 소음특성 평가)

  • Shin, Su-Hyun;Cheong, Cheol-Ung;Kim, Duck-Whan;Jung, Sung-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.7
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    • pp.644-650
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    • 2010
  • Among various elements to affect customer's evaluation of vehicle quality, BSR(Buzz, Squeak, Rattle) are considered to be a mostly contributing factor. In this paper, we provide the test method which can be used to reduce the BSR noise of instrument panel in a vehicle. First, potential source regions of the instrument panel for BSR are localized by using the vibration-excitor and near-acoustic field visualization system. Then, subjective evaluation of BSR noise from the detected potential noise source regions is made with the Zwicker's loudness and time-varying loudness methods. This illustrative analysis reveals that current experimental methods can be used as a test procedure to systematically tackle BSR issues in early stage of the vehicle development cycle, which can result in the reduction of the production cost.

A Study on BSR Noise and Sound Quality Property for Vehicle Interior Module (자동차 인테리어 모듈의 BSR 소음과 음질 특성 연구)

  • Shin, Su-Hyun;Cheong, Cheol-Ung;Jung, Sung-Soo;Kang, Dae-Hwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.6
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    • pp.550-555
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    • 2012
  • Among the various elements affecting a customer's evaluation of automobile quality, buzz, squeak and rattle(BSR) have been considered to be major factors. In most vehicle manufacturers, the BSR problems are solved by find-fix method with the vehicle road test, mainly due to various excitation sources, complex generation mechanism and subjective response. To systematically tackle the BSR problems in early stage of the vehicle development cycle, these difficulties should be resolved. The aim of the present paper is to characterize the sound quality property of BSR noise that can be used to assess the subjective responses to BSR. The four sound metrics from Zwicker's sound quality parameter are computed for the signals recorded for eight BSR noise source regions localized by using the acoustic-field visualized results. Then, the jury test of BSR noise are performed. On the basis of the computed sound metrics and jury test result is evaluated to represent the harshness of BSR noise. It is expected that the developed BSR measuring system and sound quality properties can be used to reduce the automotive interior BSR noise in terms of subjective levels as well as objective levels.