• 제목/요약/키워드: pin support

검색결과 65건 처리시간 0.046초

아이핀(i-PIN)의 지속적 사용의도에 영향을 미치는 요인에 관한 실증적 연구 (An Empirical Study on the Factors that Affect the Continuous Use Intention of i-PIN)

  • 임혁;김태성
    • Journal of Information Technology Applications and Management
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    • 제22권4호
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    • pp.159-179
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    • 2015
  • In 2005, Korean government created the Internet Personal Identification Number (i-PIN) for a new online personal identification system to protect citizens' personal information against criminal abuse. However, i-PINs have not been widely in use over a decade. Although many people joined the i-PIN service, its actual use rate has been low. This study intends to identify the factors necessary to boost the continuous use of i-PINs. It was shown that government support and perceived security had a positive effect on the perceived ease of use and perceived usefulness of the i-PIN, respectively. Perceived security also directly affected the continuous use intention of the i-PIN. The perceived ease of use significantly affected the perceived usefulness, but it did not affect the intention to continuously use the i-PIN. The factor that had the most significant influence on the continuous use intention of the i-PIN was perceived usefulness. To increase the i-PIN use rate, Korean government must reduce users' anxiety through strict security functions, and must attempt to help people use the i-PIN easily.

알루미늄 핀-조인트를 사용한 마이크로 미러의 제작과 측정 (Fabrication and Experiment of Micromirror with Aluminum Pin-joint)

  • 지창현;김용권
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제49권8호
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    • pp.487-494
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    • 2000
  • This paper describes the design, fabrication and experiments of surface-micromachined aluminum micromirror array with hidden pin-joints. Instead of the conventional elastic spring components as connection between mirror plate and supporting structure, we used pin-joint composed of pin and staples to support the mirror plate. The placement of pin-joint under the mirror plate makes large active surface area possible. These flexureless micromirrors are driven by electrostatic force. As the mirror plate has discrete deflection angles, the device can be ap;lied to adaptive optics and digitally-operating optical applications. Four-level metal structural layers and semi-cured photoresist sacrificial layers were used in the fabrication process and sacrificial layers were removed by oxygen plasma ashing. Static characteristics of fabricated samples were measured and compared with modeling results.

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정전 고속 미스트 엘리미네이터의 포집 효율 특성 (Particle removal characteristics of high-velocity electrostatic mist eliminator)

  • 김진선;김학준;한방우;우창규;김용진;이상린;문상철
    • 한국입자에어로졸학회지
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    • 제14권4호
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    • pp.121-133
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    • 2018
  • In this study, we developed a flat-plate type wet electrostatic precipitator that generates stable corona discharge compared to wire type discharge electrode. In order to compare the particle removal efficiency according to the shape of the discharge electrode such as the variation of the horizontal and vertical distance between spiked edges, and the variation of the height of discharge pin support were tested. As a result, when the horizontal distance between spiked edges was increased up to 36 mm, the vertical distance between spiked edges was increased up to 54 mm, and the height of the discharge pin support was increased up to 76 mm, the removal efficiency of PM10 was maintained at approximate 60.0%. Furthermore, the removal efficiency of particles over $5{\mu}m$ was about 80% or more. When the flow rate was 4 m/s, the gap between collection plates was 60 mm, and -14 kV was applied to the discharge electrode. The particle removal efficiency of the flat-plate type electrostatic precipitator was maintained when the horizontal and vertical distance between spiked edges, and the height of the discharge pin support was below a certain level. Those variables may be the important design factors for the shape of the discharge electrode. Therefore, when designing the electrostatic precipitator with multiple channels, the horizontal and vertical distance between spiked edges, and the height of discharge pin support must be selected in consideration of the weight of the discharge electrode and the processing cost.

파이프 서포트의 지지핀 두께와 압축하중의 상관관계 분석 (Analysis of the Correlation between the Thickness of Support Pin of Pipe Support and the Compressive Load)

  • 최명기;박종근
    • 한국안전학회지
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    • 제37권4호
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    • pp.36-43
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    • 2022
  • Generally, in construction sites, the pipe support installation workers often use support pins of 9~10 mm which are much smaller than the safety standard sizes for work convenience. Although the safety certification standard thickness of the support pins is 11 mm, and the supervisors are often indifferent to this. Hence, products with far lower performance than the pipe support safety certification value of 40,000 N, which is applied in the supporting post-structural review, are used. Accordingly, this acts as a factor causing collapse accidents in the process of pouring concrete at the construction site. Therefore, this study performed compression experiments on new and reused pipe supports to determine how the thickness of the support pins affects the structural compression performance of the pipe support by considering the thickness of the support pins as a critical variable among various factors affecting the pipe support performance. In the course of the study, the compression test of the pipe support (V2, V4) for the new products showed that only 14 (58.3%) of the total 24 samples satisfied the safety certification standard value of 40,000 N, which indicates that more thorough quality control is required in the manufacturing process. Additionally, comparing the thickness of the support pins and their fracture shape shows that the pipes with support length of 4.0 m or longer are much more affected by the buckling of the entire length than the thickness of the support pins. Of the several factors affecting the performance of reused pipe supports, it was found that, similar to the new products, the use of support pins, with thickness of 12 mm rather than 11 mm, can satisfy the safety certification value more appropriately. Therefore, regardless of the state of usage, it could be concluded that it is necessary to use 12 mm products, whose thickness is larger than that of the safety certification standard value of 11 mm, to improve the performance of the pipe supports.

재사용 V4 강재 파이프 서포트의 성능향상 요인에 관한 실험적 연구 (A Experimental Study on Performance Improvement Factors of Used V4 Steel Pipe Support)

  • 최명기;박종근
    • 한국안전학회지
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    • 제35권3호
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    • pp.43-48
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    • 2020
  • It is considered that most of reusable pipe supports, which are used as formwork support posting at construction sites, do not meet the performance standard. Due to the use of reusable pipe supports that do not meet such performance standard the potential risk of collapse accident is increasing. Therefore, this study identifies the status of compliance with performance standard, and presents the requirements for improving quality control to prevent the collapse of pipe supports reused at the construction site. First, if the female thread of the product with no clearance and new support pin with the diameter of 12mm are replaced at the same time for use, it is considered that the performance will be improved. Second, as the quality performance during use can be improved in the case of larger thickness of inner diameter compared to the case of larger thickness of outer diameter, it is necessary to increase the inner pipe thickness greatly than the current thickness. Based on the results of this study, it is expected that the performance the reusable pipe support (V4) can be improved, if the diameter of the support pin is 12mm, the female thread has a small clearance, and the inner tube thickness is 2.3 ~ 2.7mm. In addition, it is considered that other performance improvement factors included in the study results could be used as important data for improving the performance of reusable pipe support.

지하 대공간 숏크리트 품질관리를 위한 현장강도 시험기술에 관한 연구 (A Study on Field Testing Methods for the Shotcrete Quality Control of Large Underground Spaces)

  • 장석부;이성우;홍의준;문상조
    • 터널과지하공간
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    • 제16권5호
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    • pp.405-412
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    • 2006
  • 지하대공간 건설에 있어서 숏크리트는 가장 중요한 지보재임은 주지의 사실이다. 숏크리트의 강도는 현장 배합 및 타설 조건에 따라 실험실 조건의 숏크리트와는 큰 차이를 보이는 것이 일반적이다. 구조부재인 일반 콘크리트와 달리 숏크리트의 초기강도는 지하공간의 초기 안정화에 매우 중요하다. 그러나, 숏크리트 초기강도의 측정은 적절한 현장강도시험방법의 부재로 인하여 잘 관리되지 않은 실정이다. 따라서, 현장에서 숏크리트 초기강도를 효과적으로 측정할 수 있는 방법이 요구되고 있는 실정이다. 본 논문에서는 핀관입시험법 및 점하중강도시험법의 현장 숏크리트 초기강도 측정에 대한 적합성을 검토하였다. 이를 위해 다양한 양생강도에 따른 일축압축시험, 핀관입시험, 점하중시험을 수행하여 일축압축강도에 대한 신뢰성 높은 핀관입깊이와 점하중 지수의 상관관계식을 도출하였다.

축-베어링 시스템의 연성 특성을 고려한 볼 베어링의 선정 (Ball-Bearing Selection Considering Flexibility of Shaft-Bearing System)

  • 윤기찬;최동훈
    • Tribology and Lubricants
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    • 제16권1호
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    • pp.39-45
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    • 2000
  • In this paper, the effects of shaft and bearing flexibilities are investigated for the accurate modeling of a shaft-bearing system supported by ball bearings. Generally, rolling bearings are modeled by simple rigid pin-joint in the mechanical design. However, they can no longer be modeled by ideal boundary conditions in the advanced applications because the rigid pin-joint model cannot satisfy the current trends of mechanical design decreasing mass and reducing volume. Consequently the flexible support model of ball bearing is investigated using the static analysis module developed by A .B. Jones and T. A. Harris. A simple two-bearing system, supported by two deep groove ball bearings and radially loaded on the shaft midway between the bearings, is utilized to validate the coupled model of shaft-bearing system. Numerical computations using the model indicate that the shaft span length, locating/floating bearing arrangements and applied bearing size are significant factors in determining the mechanical behaviors. The flexible support model of ball bearing can be escaped to over-estimate in the bearing fatigue life. The proposed simple design formulation obtained by numerical simulations can approximately predict a rate of bearing life reduction as a function of shaft span length/shaft diameter (L/d).

터널의 품질관리를 위한 숏크리트 초기강도의 현장강도 시험기술 (Field Testing Methods on Early Shotcrete Strength for Tunnel Quality Control)

  • 홍의준;장석부;이성우;김기림;문상조
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2007년도 춘계학술대회 논문집
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    • pp.468-476
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    • 2007
  • Generally, the strength of the field shotcrete is heavily dependent on the field mixing and spraying conditions so that it is different from the strength of the shotcrete mixed in laboratories. As a support member, the early strength of shotcrete unlike concrete as structural material is very important to the initial stabilization of the excavation face in tunnels. Therefore, the field methods to efficiently test the early strength of shotcrete have been highly required. This paper aimed to verify the pneumatic pin penetration test and the point load test for measuring the early strength of the field shotcrete. Through a series of uniaxial compression, pin penetration, and point load tests for the range of the early shotcrete strength, two equations to estimate reliably the uniaxial compressive strength by the pin penetration and the point load tests were derived. Field tests in working tunnel were carried out in order to estimate the economic efficiency. As a result, pin penetration method was proved to be the most effective method for testing the early strength of the field shotcrete.

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