• Title/Summary/Keyword: 부착력 측정

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The Development of UV Blocking Type Pressure-Sensitive Adhesive Sheet for Window (자외선이 차단되는 창문용 점착시트 개발에 관한 연구)

  • Kim, Sung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.1
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    • pp.559-564
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    • 2011
  • The UV blocking type pressure-sensitive adhesive sheet was developed by mixing UV blocking reagent with adhesive material, instead of conventional method in which the reagent was mixed with PVC substrate. The blocking performance of the sheet was evaluated by measuring the absorbance in 280-400 nm region. Both organic and inorganic type blocking reagents were examined. The blocking ability of the former is better than that of the later. Only 1% addition of blocking reagents is effective to block UV light without affecting to visibility and tackiness of adhesive tapes.

Diagnosis of Pipe Structures using Impedance Measurement Sensor nodes (임피던스 측정 센서 노드를 이용한 배관 설비 진단)

  • Jang, In-Hwan;Jeong, Yeon-Wook;Song, Byung-Hun
    • 한국정보통신설비학회:학술대회논문집
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    • 2009.08a
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    • pp.367-369
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    • 2009
  • 본 논문은 저전력 무선 임피던스 기반 구조물 건전성 감시 USN 시스템을 활용하여 electro-mechanical Impedance 센서의 일종인 PZT센서를 부착한 배관 구조물의 건전성을 진단하는 방법과 그 실험 결과에 대해 소개 한다. 기존에는 건설구조물에 가해지는 전기적인 입출력비에 해당하는 임피던스를 계측하기 위해서 비교적 고가의 대형 계측 장비가 필요로 했으며, 구조물에 설치된 센서를 계측장비에 연결하기 위한 유선의 케이블 작업 역시 추가로 필요했었다. 대형 배관 구조물의 경우에는 이러한 문제점 때문에 임피던스를 이용한 능동형 센서가 제대로 활용되지 못하고 있고 비정기적인 비파괴검사에만 국한되어 사용되어 왔다. USN기술은 저전력 소출력 무선통신을 통해 기존의 계측시스템과는 다른 상시모니터링의 장점을 가지고 있는 기술로서 최근 토목/건설 분야에서 적극적으로 활용이 되는 융합기술이다. 본 논문에서 구조물 건전성 감시 분야와 저전력 무선 계측 기술의 통합을 통해 얻어진 최적화된 배관 건전도 진단 센서 노드의 효율성을 정량적 실험 데이터를 통해 입증하고, 앞으로의 연구 방향에 대한 제안으로 끝을 맺는다.

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엘크 사슴육의 물리화학적 및 지방산 조성

  • Kim, Il-Seok;Jin, Sang-Geun;Ha, Gyeong-Hui;Park, Gi-Hun;Ha, Ji-Hui;Jeong, Gi-Jong;Choe, Yu-Mi;Park, Seok-Tae;Gwak, Gyeong-Rak;Park, Jeong-Gwon;Gang, Yang-Su
    • Proceedings of the Korean Society for Food Science of Animal Resources Conference
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    • 2005.10a
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    • pp.146-149
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    • 2005
  • 엘크 사슴고기(Elk deer, Cervus elaphus andadensis)에서 생산된 등심(T1)과 뒷다리살(T2)에 대한 품질 특성을 파악코자 실시되었으며 분석 결과는 다음과 같다. T2가 T1보다 수분 함량은 낮고, 단백질 함량은 높았으며, 전단가는 낮고 보수력은 높았다. 육색 측정 결과 T1 및 T2간 명도, 적색도, 황색도 모두 유의적인 차이가 없었다. 조직특성 조사에서 경도, 부착성, 검성 및 파쇄성은 유의적인 차이가 있었으나, 응집성과 탄력성은 유의적인 차이가 없었다. 지방산 분석결과, SFA와 UFA는 두 부위 간 유의적인 차이가 없었으나 EFA는 T1이 유의적으로 높았다.

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A Study on Failure Mechanism of Reinforced Earth Retaining Wall under Strip Load (대상하중하의 보강토옹벽의 파괴 메카니즘에 관한 연구)

  • 유남재;김영길
    • Geotechnical Engineering
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    • v.7 no.4
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    • pp.35-48
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    • 1991
  • Based on centrifuge model tests, the failure mechanism of reinforced earth retaining wall under strip load was investigated in this paper. Tests were performed by changing the materials of reinforcing strips, strip lengths, and strip arrangements. The strips were strain-gauged to measure the tensions in strips. The results were analyzed and compared with various design methosds in use to verify their feasibility. Consequently, a centrifuge model test was an effective method of investigating the behavior of reinforced earth retaining wall. The 2 : 1 stress diffusion method showed comparable results with tests in estimating the capacity of the reinforced earth wall under strip load. The superposition of tensions due to selfweight of the backfill and strip load was valid to estimate total tensions mobilized in strips. Using the elasticity theory to estimate the maximum tension mobilized in strips due to surcharge, while solutions of Boussinesq and Westergaard underestimated less tensions than the measured valises, Frohlich solution showed the comparable results with tests.

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Low-Velocity Impact Detection of Composite Plate Using Piezopolymer Sensor Signals without Charge Amplifier (전하증폭기를 사용하지 않은 고분자 압전센서 신호를 이용한 복합재 평판의 저속충격 탐지)

  • 김인걸;정석모
    • Composites Research
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    • v.13 no.6
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    • pp.47-54
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    • 2000
  • One promising method for impact detection of composite structures is based on the use of piezopolymer thin fim (PVDf) sensor. In this paper, the relationship between the contact force and the signals of the attached strain gage and PVDF sensor to the composite plate subjected to low-velocity impact were derived. The relation for the open circuit and short circuit voltage of PVDF sensor was derived based on the equivalent circuit model of the piezoelectric sensor. The work was then extended to include experimental investigation into the use of short circuit voltage of PVDF sensor without using charge amplifier to detect low-velocity impact. The natural frequencies and damping ratio of the composite plate obtained from the vibration test were used to modify the analytical model and therefore the differences between measured and simulated signal of the modified analytical model in both forward and backward problem were considerably reduced. The reconstructed contact force and simulated sensor signals agreed well with the measured contact force, strain gage signal, and PVDF sensor singanl.

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Power Transmission from a Vibrating Mass to a Supporting Elate through Isolators (능동 및 수동격리기를 적용한 진동계에 있어서 힘의 전달에 관한 연구)

  • Jin-Woo Lee;Colin H. Hansen
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.200-207
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    • 2001
  • The transmission of harmonic vibratory power form a vibrating rigid body into a supporting plate through passive and active isolators is investigated theoretically and experimentally. The theoretical model allows for the transmission of vertical and horizontal harmonic forces and moments about all three coordinate sun. The experiment is to use vibration actuators attached to the intermediate mass of the two-stage mount to minimize the rotational and translational vibration of the intermediate mass. The performance is done by measuring the vibration at the error sensors due to the primary vibration source and measuring the transfer functions from the control sources to the error sensors. Results show that over a frequence range from 1 to 100Hz, transmission into the supporting plate can be reduced substantially by employing in parallel with existing passive isolators, active isolators adjusted to provide appropriate control force amplitudes.

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다목적 실용위성 3호 RFC 시험 결과의 이론적 검증

  • Jang, Gyeong-Deok;Kim, Tae-Yun;Jang, Jae-Ung;Mun, Gwi-Won
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.2
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    • pp.196.1-196.1
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    • 2012
  • 인공위성은 지상에서부터 발사 및 궤도 운용까지 다양한 전자파 환경에 노출되며 이러한 환경에서의 위성 운용을 검증하기 위하여, 다양한 전자파 환경을 모사하는 전자파 환경시험을 수행하게 된다. 특히, 궤도내에서 위성의 운용시 지상국과의 교신을 위하여 X 밴드 안테나와 S 밴드 안테나에서 지상국으로 강한 전자기파를 방사하게 되는데, 이 방사에너지가 위성에 영향을 주는지 검증하는 시험을 지상에서 수행한다. 이런 시험을 RFC (RF Auto-Compatibility) 시험이라고 부른다. RFC 시험은 위성으로부터 방사되는 전자기파가 외부에 새어나가지 않도록 전자파 챔버내에서 시험하며, 강한 전자기파를 흡수할 수 있는 고전력 전파 흡수체가 설치된 전자파 챔버가 필요하다. RFC 시험시 X 밴드 안테나와 S 밴드 안테나를 최대 전력으로 방사시키고, 이때 위성 주변에 전자파 센서를 부착하여 전계강도를 측정함으로써 위성으로 입사되는 전자기파의 세기가 적정 레벨 이하인지를 검증하고, 동시에 위성의 운용상태를 확인하여 위성에 영향이 없음을 검증한다. 본 논문에서는 다목적 실용위성 3호의 RFC 시험시 측정된 전계강도를 이론적으로 검증하고, RS 시험시 인가하는 레벨과의 상관관계를 설명한다. RS 시험 레벨의 선정은 위성 안테나의 방사레벨과 관련이 있으며 RFC 시험결과를 검토함으로써 RFC 시험 결과의 유효성과 RF 레벨 요구사항의 적절성을 검증한다.

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Design and Implementation of Cattle Behavior Detection System based on Internet of Things (사물 인터넷 기반 소 행동 특성 관찰 시스템 설계 및 구현)

  • Lee, Ha-Woon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.6
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    • pp.1159-1166
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    • 2017
  • Cattle behavior detection system based on Internet of Things is designed and implemented by using gyroscope and acceleration sensor, Arduino pro-mini and bluetooth module. The implemented system measures cattle's moving and the measured data are transmitted to smart phone by bluetooth module. They are displayed by 2-dimensional graph on the smart phone and the number of cattle's step are calculated from the graph. The detected and gathered data from the system are analyzed by the proposed algorithm to decide which cows are in the estrus or not, and the proposed system can be used to increase the success rate of artificial insemination in normal estrus by detecting cow's behaviors such as the number of steps and jumping. In this paper, the implemented cattle behavior detecting system are strapped on cattle's leg and it measures cattle behaviors for determining that a cattle is estrus or not by the proposed algorithm. In the future research, the system which lengthens communication distance and increases the number of cattle under the test will be considered and also the measured data will be database for cattle research.

Probiotic Properties of Lactic Acid Bacteria Isolated from Commercial Raw Makgeolli (시판 생막걸리에서 분리한 유산균의 프로바이오틱스 기능성 연구)

  • Jung, Sang-Eun;Kim, Sae-Hun
    • Korean Journal of Food Science and Technology
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    • v.47 no.1
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    • pp.44-50
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    • 2015
  • The purpose of this study was to characterize the lactic acid bacteria found in makgeolli in terms of bacterial identity and gastric compatibility. Lactic acid bacteria were isolated from commercial raw makgeolli and separated into six strains that are resistant to gastric acidity and bile acid. These strains were identified by analysis of their 16S rDNA, as Lactobacillus plantarum BSM-2 and EHJ-1, Lactobacillus casei GSM-3 and EHJ-2, Lactobacillus brevis BSM-3 and Pediococcus pentosaceus TJH-1. All strains exhibited adhesion to intestines, showing that they were probiotic. We also found that L. plantarum BSM-2 had excellent resistance to bile acid as well as antioxidant activity. Taken together with its antibacterial properties and ability to lower cholesterol, our data suggest that L. plantarum BSM-2 was the most beneficial probiotic among the six strains.

Strength Characteristics in 3D-printed Concrete with Interlayer Reinforcements (층간 보강재로 보강한 3D 프린팅 콘크리트의 강도 특성)

  • Lee, Jung Woo;Park, Ji-Hun;Bui, The Quang;Jo, Changbin;Yang, In-Hwan
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.3
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    • pp.338-347
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    • 2021
  • This paper aims to evaluating the interlayer strength of 3D-printed concrete with interlayer reinforcement. According to lap splices, two reinforcement methods were considered. One method did not include lap splices of interlayer reinforcement, but the other method included lap splices with length of 40mm. In addition, two different curing conditions were applied: air curing conditions and water curing conditions. The compressive, splitting tensile, and flexural tensile strengths of 3D-printed concrete specimens were measured in three loading directions with different reinforcement methods and curing conditions. Splitting and flexural tensile strengths decreased considerably when tensile stresses acted over the interlayers of 3D-printed concrete specimens. However, the flexural tensile strength or interlayer bonding strength of the printed specimens increased significantly at the interlayers when the longitudinal interlayer reinforcement penetrated printed layers. Interlayer bonding strength of printed concrete decreased after air curing treatment was applied because interlayers of printed concrete with more pores formed by the air cu ring conditions are more vulnerable to the load.