• Title/Summary/Keyword: automobiles

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The Effects of Si Content on the Cutting Characteristics in the Turing Process of A1-Si Alloy, Using a Polycrystalline Diamond Tool (다결정 다이아몬드공구를 사용한 Al-Si합금의 선삭과정에서 절삭특성에 미치는 Si함량의 영향)

  • Lee, Kyung-Ho;Yun, Young-Sik;Lee, Sang-Jo
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.6
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    • pp.20-26
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    • 1995
  • With the recent development of light and high efficient automobiles and aircraft, demand of the A1-Si alloy is rapidly increasing. However, there is an inclination that as the content of silicon increases it becomes more difficult to machine. Accordingly, the present study intends to analyse and study the cutting resistance and surface roughness of A1-Si alloy with Si contents of 8%, 12%, 17%, and 20%. The A1-Si alloy specimens were turned by a poly- crystalline diamond tool under selected cutting conditions, and results are here described and discussed.

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A Study on the Database Development of GMA Welding for Die Remodeling

  • Kim, J.T.;Na, S.J.;Kim, D.W.;Seo, M.S.
    • International Journal of Korean Welding Society
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    • v.1 no.2
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    • pp.7-11
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    • 2001
  • Almost every die for automobiles must be corrected or remodeled for minor geometrical changes or fur better hardness characteristics by an arc welding process. Although many other kinds of arc welding processes have been automated with robots, the molten metal deposition process for die remodeling still depends entirely on experienced welders. In this study, a database for bead shapes with respect to welding parameters is constructed through experiments to automate molten metal deposition by the arc welding process. Changes in the welding parameters for inclined base metal are studied to consider the effect of die geometries on the welding process.

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A study on the tire structure vibration for road noise reduction and chassis design (자동차 도로소음 저감과 샤시 설계를 위한 타이어 구조진동에 관한 연구)

  • Song, Youn-Seob
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.6
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    • pp.137-144
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    • 1995
  • The purpose of this study is to obtain a foundation data for chassis design and road noise reduction of automobiles. Using the combination of the automobile, radial tires and instrumentation equipment, experimental investigation was carried out to examine the characteris- tics of the structural vibration of tire as the key to obtaining the effective parameters for reducing road noise. From the results of this studies it has been confirmed that the specific ranges of natural frequency of tire exciting the suspension and chassis system. And the tire, axle and chassis natural frequency of automobile govern the road noise. Results show that material properties of tire and experimental condition are major parameter for shifting of tire natural frequency. These results would be utilized as basic materials for the design of chassis design with papametric study, which enables a designer of an automobile to foresee the influence of the various design factors or operating conditions.

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High-sensitivity NIR Sensing with Stacked Photodiode Architecture

  • Hyunjoon Sung;Yunkyung Kim
    • Current Optics and Photonics
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    • v.7 no.2
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    • pp.200-206
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    • 2023
  • Near-infrared (NIR) sensing technology using CMOS image sensors is used in many applications, including automobiles, biological inspection, surveillance, and mobile devices. An intuitive way to improve NIR sensitivity is to thicken the light absorption layer (silicon). However, thickened silicon lacks NIR sensitivity and has other disadvantages, such as diminished optical performance (e.g. crosstalk) and difficulty in processing. In this paper, a pixel structure for NIR sensing using a stacked CMOS image sensor is introduced. There are two photodetection layers, a conventional layer and a bottom photodiode, in the stacked CMOS image sensor. The bottom photodiode is used as the NIR absorption layer. Therefore, the suggested pixel structure does not change the thickness of the conventional photodiode. To verify the suggested pixel structure, sensitivity was simulated using an optical simulator. As a result, the sensitivity was improved by a maximum of 130% and 160% at wavelengths of 850 nm and 940 nm, respectively, with a pixel size of 1.2 ㎛. Therefore, the proposed pixel structure is useful for NIR sensing without thickening the silicon.

Technological Trends in Safety Solutions for Construction Equipment (건설장비의 안전 솔루션 기술 동향)

  • Yong Jin Kim;Myoung Kook Seo
    • Journal of Drive and Control
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    • v.20 no.2
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    • pp.7-14
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    • 2023
  • Negative perceptions of the construction industry are prevalent due to the high accident rate at construction sites. Recently, with the gradual change of the perception in industrial safety, the demand for improving the safety level of construction sites has increased. Accordingly, the government is preparing various safety-level measures such as the Serious Disaster Punishment Act and support for industrial safety management costs. In addition, private industries are incorporating various safety equipment in the sites. This paper introduced the current status of safety sensors and solutions currently applied to construction equipment and industrial vehicles. The technology development direction suitable for construction equipment was introduced by comparing the operating environment of automobiles and construction equipment. and the need to develop performance standards to protect and revitalize the market for safety devices for construction equipment was suggested.

Preparation and Physical Properties of Acrylic Urethane Resin Coatings Using High Solids Acrylic Resin (하이솔리드 아크릴수지의 합성과 아크릴-우레탄 도료의 도막 물성)

  • Kim, Seong-Kil;Park, Hyong-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.160-161
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    • 2021
  • To prepare polyurethane coatings for top coatings of automobiles, acrylic resins containing 75% of solids were synthesized by a radical polymerization. The viscosity of the acrylic resins was increased with increasing OH values. Crosslinked acrylic-urethane clear coatings were obtained by curing reaction between the synthesized acrylic resins and hexamethylene diisocyanate(HDI) trimer(Desmodur N-3600). The physical properties from the following studies were carried out : viscosity(Zahn cup #2), adhesion, pensil hardness, and 60° specular gloss. Various properties of the acrylic-urethane clear coatings as top coatings of mobile coat were evaluated on the coating specimens. Adhesion property to a substrate, 60° specular gloss, and pencil hardness of prepared paint showed quite good properties.

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Manufacturing of the Prototype for CVT using Spring & Application at Small Electric Vehicle

  • Shin, Bu Seob
    • International journal of advanced smart convergence
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    • v.12 no.4
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    • pp.451-457
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    • 2023
  • Global warming is causing abnormal climates such as floods, droughts, and typhoons all over the world. According to some scientists, carbon dioxide emitted from automobiles is the main cause of global warming. To cope with this, each country is making efforts to replace the existing fossil fuel-powered engine-driven cars with electric vehicles. In order to commercialize small electric vehicles in Korea, it is necessary to solve many problems such as improvement of hill climbing capacity and improvement of power performance. In this study, we propose a proprietary model for a continuously variable transmission(CVT) of a small electric vehicle that can be operated on hills, in which a spring is mounted on a driving pulley and a driven pulley. A prototype of the CVT model using a spring was manufactured and attached to a small electric vehicle body.

Failure Detection Method of Industrial Cartesian Coordinate Robots Based on a CNN Inference Window Using Ambient Sound (음향 데이터를 이용한 CNN 추론 윈도우 기반 산업용 직교 좌표 로봇의 고장 진단 기법)

  • Hyuntae Cho
    • IEMEK Journal of Embedded Systems and Applications
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    • v.19 no.1
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    • pp.57-64
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    • 2024
  • In the industrial field, robots are used to increase productivity by replacing labors with dangerous, difficult, and hard tasks. However, failures of individual industrial robots in the entire production process may cause product defects or malfunctions, and may cause dangerous disasters in the case of manufacturing parts used in automobiles and aircrafts. Although requirements for early diagnosis of industrial robot failures are steadily increasing, there are many limitations in early detection. This paper introduces methods for diagnosing robot failures using sound-based data and deep learning. This paper also analyzes, compares, and evaluates the performance of failure diagnosis using various deep learning technologies. Furthermore, in order to improve the performance of the fault diagnosis system using deep learning technology, we propose a method to increase the accuracy of fault diagnosis based on an inference window. When adopting the inference window of deep learning, the accuracy of the failure diagnosis was increased up to 94%.

The applicability of noncontact sensors in the field of rehabilitation medicine

  • Yoo Jin Choo;Jun Sung Moon;Gun Woo Lee;Wook-Tae Park;Min Cheol Chang
    • Journal of Yeungnam Medical Science
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    • v.41 no.1
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    • pp.53-55
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    • 2024
  • A noncontact sensor field is an innovative device that can detect, measure, or monitor physical properties or conditions without direct physical contact with the subject or object under examination. These sensors use a variety of methods, including electromagnetic, optical, and acoustic technique, to collect information about the target without physical interaction. Noncontact sensors find wide-ranging applications in various fields such as manufacturing, robotics, automobiles, security, environmental monitoring, space industry, agriculture, and entertainment. In particular, they are used in the medical field, where they provide continuous monitoring of patient conditions and offer opportunities in rehabilitation medicine. This article introduces the potential of noncontact sensors in the field of rehabilitation medicine.

Application of Emotional Video Contents Using Car Windows (자동차 윈도우를 활용한 감성 영상콘텐츠 적용 방안)

  • Jung, Su-Young;Choe, Jong-Hoon
    • The Journal of the Korea Contents Association
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    • v.14 no.4
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    • pp.37-46
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    • 2014
  • Industrialization and urbanization have led automobiles to transform into more than just modes of transportation; they have become daily necessities as well as extensions of living spaces where a variety of activities can be done and automotive applications of the latest information technology are accelerated. Though material abundance has increased in the modern society, the conflicts and the stress emerging from a social structure focused on competition have increased as well. Such lifestyles generate a need for personal space and media content for healing the body and the mind. This research explores the automotive application of video content with the goal of refreshing the minds of the passengers. To this end, previous studies have investigated the emotional effect of videos, focusing on the responses of diverse groups of adults (age group of 20 to 60) who frequently used automobiles, which had video displays installed in them. The results showed that watching video contents on a full window inside a car influenced the creation of positive feelings7 and emotional satisfaction. The research attempts to study the methods of providing video contents and the effects of watching them that could aid the emotional well-being of passengers, and presents the possibility of emotional satisfaction created by a convergence of cars and multimedia contents in the future.