• 제목/요약/키워드: complete contact

검색결과 213건 처리시간 0.025초

Analytic solution for the interaction between a viscoelastic Bernoulli-Navier beam and a winkler medium

  • Floris, Claudio;Lamacchia, Francesco Paolo
    • Structural Engineering and Mechanics
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    • 제38권5호
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    • pp.593-618
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    • 2011
  • This paper deals with the problem of the determination of the response of a viscoelastic Bernoulli-Navier beam, which is resting on an elastic medium. Assuming uniaxial bending, the displacement of the beam axis is governed by an integro-differential equation. The compatibility of the displacements between the beam and the elastic medium is imposed through an integral equation. In general and in particular in the case of a Boussinesq medium, the solution has to be pursued numerically. On the contrary, in the case of a Winkler's medium the compatibility equation becomes a linear finite relationship, which allows finding an original analytical solution of the problem for both hereditary and aging behavior of the beam. Some numerical examples complete the paper, in which a comparison is made between the hereditary and the aging model for the creep of the beam.

96 지방 기능 경기대회 밀링 과제 분석 (The Job Analysis of milling in the Local Skill Contest in 1996)

  • 이광재
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1996년도 춘계학술대회 논문집
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    • pp.18-23
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    • 1996
  • The Job of Milling in the Local Skill Contest in 1996 was to assemble parts into a complete whole of the parts number 1, 3, 4 worded by Milling Machine and the parts number 2 worked by Machining Center. In the parts of Milling Machine, the Job was to work 45$^{\circ}$angle working, T-slot, dovetail, the correct position drilling, rimming, boring, etc. In the Machining Center, there were the way of calculation of point of contact of 'R' contour curved line and lots of working elements. So, it was possible to work the parts and assemble them within the time limit only through the program to be made out in the way to shorten working hours.

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Three-Dimensional Nanofabrication with Nanotransfer Printing and Atomic Layer Deposition

  • 김수환;한규석;한기복;성명모
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2009년도 제38회 동계학술대회 초록집
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    • pp.87-87
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    • 2010
  • We report a new patterning technique of inorganic materials by using thin-film transfer printing (TFTP) with atomic layer deposition. This method consists of the atomic layer deposition (ALD) of inorganic thin film and a nanotransfer printing (nTP) that is based on a water-mediated transfer process. In the TFTP method, the Al2O3 ALD growth occurs on FTS-coated PDMS stamp without specific chemical species, such as hydroxyl group. The CF3-terminated alkylsiloxane monolayer, which is coated on PDMS stamp, provides a weak adhesion between the deposited Al2O3 and stamp, and promotes the easy and complete release of Al2O3 film from the stamp. And also, the water layer serves as an adhesion layer to provide good conformal contact and form strong covalent bonding between the Al2O3 layer and Si substrate. Thus, the TFTP technique is potentially useful for making nanochannels of various inorganic materials.

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Response of a completely free beam on a tensionless Pasternak foundation subjected to dynamic load

  • Celep, Z.;Guler, K.;Demir, F.
    • Structural Engineering and Mechanics
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    • 제37권1호
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    • pp.61-77
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    • 2011
  • Static and dynamic responses of a completely free elastic beam resting on a two-parameter tensionless Pasternak foundation are investigated by assuming that the beam is symmetrically subjected to a uniformly distributed load and concentrated load at its middle. Governing equations of the problem are obtained and solved by paying attention on the boundary conditions of the problem including the concentrated edge foundation reaction in the case of complete contact and lift-off condition of the beam ina two-parameter foundation. The nonlinear governing equation of the problem is evaluated numerically by adopting an iterative procedure. Numerical results are presented in figures to demonstrate the non-linear behavior of the beam-foundation system for various values of the parameters of the problem comparatively by considering the static and dynamic loading cases.

Characteristics of hybrid mask mold for combined nanoimprint and photolithography technique

  • MOON KANSHUN;CHOI BANGLIM;PARK IN-SUNG;HONG SUNSHUM;YANG KIHYUN;LEE HEON;AHN JINHO
    • 한국반도체및디스플레이장비학회:학술대회논문집
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    • 한국반도체및디스플레이장비학회 2005년도 추계 학술대회
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    • pp.147-150
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    • 2005
  • We process a novel approach cal led combined nanoimprint and photolithography (CNP) to greatly simplify the fabrication in conventional nanoimprint lithography (NIL). In this study, a novel HMM with anti-sticking $SiO_2$ layer is introduced to improve the quality of transferred pattern. The surface property was investigated using contact angle measurement and spectrophotometer. Replicate pattern with CNP using HMM showed complete pattern transfer without defect.

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Delayed Lateral Row Anchor Failure in Suture Bridge Rotator Cuff Repair: A Report of 3 Cases

  • Jeong, Jae-Jung;Ji, Jong-Hun;Park, Seok-Jae
    • Clinics in Shoulder and Elbow
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    • 제21권4호
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    • pp.246-251
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    • 2018
  • Compared to single row repair, use of lateral row anchors in suture bridge rotator cuff repair enhances repair strength and increases footprint contact area. If a lateral knotless anchor (push-in design) is inserted into osteoporotic bone, pull-out of the lateral row anchor can developed. However, failures of lateral row anchors have been reported at several months after surgery. In our cases, even though complete cuff healing occurred, delayed pull-out of the lateral row anchor in the suture bridge repair occurred. In comparison to a conventional medial anchor, further biomechanical evaluation of the pull-out force, design, and insertion angle of the lateral anchor is needed in future studies. We report three cases with delayed pull-out of lateral row anchor in suture bridge rotator cuff repair with a literature review.

코로나 바이러스 대유행에 따른 치과 의료 관리 가이드라인 (Guidelines for dental clinic infection prevention during COVID-19 pandemic)

  • 김진
    • 대한치과의료관리학회지
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    • 제8권1호
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    • pp.1-7
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    • 2020
  • Dental settings have unique characteristics that warrant specific infection control considerations, including (1) prioritizing the most critical dental services and provide care in a way that minimizes harm to patients due to delayed care, or harm to personnel from potential exposure to persons infected with the COVID-19 disease, and (2) proactively communicate to both personnel and patients the need for them to stay at home if sick. For health care, an interim infection prevention and control recommendation (COVID-19) is recommended for patients suspected of having coronavirus or those whose status has been confirmed. SARS-CoV-2, which is the virus that causes COVID-19, is thought to be spread primarily between people who are in close contact with one another (within 6 feet) through respiratory droplets that are produced when an infected person coughs, sneezes, or talks. Airborne transmission from person-to-person over long distances is unlikely. However, COVID-19 is a new disease, and there remain uncertainties about its mode of spreads and the severity of illness it causes. The virus has been shown to persist in aerosols for several hours, and on some surfaces for days under laboratory conditions. COVID-19 may also be spread by people who are asymptomatic. The practice of dentistry involves the use of rotary dental and surgical instruments, such as handpieces or ultrasonic scalers, and air-water syringes. These instruments create a visible spray that can contain particle droplets of water, saliva, blood, microorganisms, and other debris. While KF 94 masks protect the mucous membranes of the mouth and nose from droplet spatter, they do not provide complete protection against the inhalation of airborne infectious agents. If the patient is afebrile (temperature <100.4°F)* and otherwise without symptoms consistent with COVID-19, then dental care may be provided using appropriate engineering and administrative controls, work practices, and infection control considerations. It is necessary to provide supplies for respiratory hygiene and cough etiquette, including alcohol-based hand rub (ABHR) with 60%~95% alcohol, tissues, and no-touch receptacles for disposal, at healthcare facility entrances, waiting rooms, and patient check-ins. There is also the need to install physical barriers (e.g., glass or plastic windows) in reception areas to limit close contact between triage personnel and potentially infectious patients. Ideally, dental treatment should be provided in individual rooms whenever possible, with a spacing of at least 6 feet between the patient chairs. Further, the use of easy-to-clean floor-to-ceiling barriers will enhance the effectiveness of portable HEPA air filtration systems. Before and after all patient contact, contact with potentially infectious material, and before putting on and after removing personal protective equipment, including gloves, hand hygiene after removal is particularly important to remove any pathogens that may have been transferred to the bare hands during the removal process. ABHR with 60~95% alcohol is to be used, or hands should be washed with soap and water for at least 20 s.

한국안광학회지 게재 논문의 주제어와 MeSH 용어의 비교·분석 (Comparison and Analysis of Keywords in the Korean Ophthalmic Optics Society Articles to MeSH Terms)

  • 김대윤;이민형;최문성
    • 한국안광학회지
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    • 제21권2호
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    • pp.83-90
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    • 2016
  • 목적: 한국안광학회지에 게재된 논문을 대상으로 영문 주제어(key word)와 의학용어 주제어집(MeSH-Medical Subject Headings) 용어와의 일치도를 비교 분석하여 한국안광학회지에서의 MeSH 용어의 이해도와 활용도를 높이고자 하였다. 방법: 2004년 9권 1호부터 2016년에 21권 1호까지 최근 12년 간 총 409편의 영문 주제어 1952개를 대상으로 MeSH 용어와의 일치도를 완전일치, 부분일치, 불일치로 분석하였다. 결과: 분석 결과 완전일치를 보인 주제어 수는 439개로 전체의 22.4%이고, 부분 일치한 용어의 수는 815개이며 전체의 41.8%를 차지하였다. 완전불일치한 주제어는 총 693개가 나왔으며 이는 전체의 35.5%에 해당되었다. MeSH 용어 중 가장 높은 빈도수를 보인 주제어는 Myopia, Astigmatism과 visual acuity 순서였으며, MeSH 용어와 부분일치를 보인 논문 주제어 중 Refractive error, Soft contact lens, Phoria 순서로 높은 빈도수를 나타내었다. MeSH 용어와 비교 시 불일치되는 주제어 중에서 빈도가 상위인 것은 Accommodative lag와 Pseudomonas aeruginosa 였다. 결론: 한국안광학회지가 유명 MEDLINE에서 검색되는 논문 활용성을 제고하기 위하여 영문 주제어를 선택할 때 MeSH 용어로 선택 될 수 있도록 해야 한다.

변색된 유전치의 순측접근에 의한 치수치료 및 레진수복 (LABIAL APPROACH OF PULP TREATMENT AND RESIN RESTORATION ON DISCOLORED NECROTIC PRIMARY ANTERIOR TOOTH)

  • 채문희;송제선;최형준;김성오
    • 대한장애인치과학회지
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    • 제10권2호
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    • pp.84-88
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    • 2014
  • 1. 순측접근법은 치수치료를 순측으로 시행한 후 변색된 순측의 치질을 확대하여 삭제하고 레진으로 순면전체를 수복함으로써 치수치료와 동시에 심미성을 회복할 수 있다. 2. 순측으로 치수치료를 시행하므로 시야가 확보에 유리하고 기구조작이 용이해 행동조절이 잘 되지 않는 어린이에게 추천된다.

PFC2D 활용을 위한 정량적 미시변수 결정법 (Suggested Method for Determining a Complete Set of Micro-Parameters Quantitatively in PFC2D)

  • 정용훈;이정인
    • 터널과지하공간
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    • 제16권4호
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    • pp.334-346
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    • 2006
  • 개별요소법을 사용한 수치해석 프로그램인 PFC2D는 암석역학에 많이 사용되고 있다. 그러나 해석 모델을 구성하는 입자와 접촉의 특성을 결정하기 위해서는 시행오차적인 지루한 반복 과정을 거쳐야 한다. 본 연구에서는 해석 모델을 정의하는 미시변수가 일축압축시험으로부터 얻어지는 거시 물성에 미치는 영향을 분석하였다. 또한 분석 결과에 기초하여 간단하고 신뢰할 수 있는 정량적인 미시변수 결정법을 제안하였다. 제안된 미시변수 결정법을 검증하기 위하여 10종류의 암석 시험편을 생성하기 위한 수치 실험을 수행하였다. 그 결과 단 2회의 수치 실험만으로 탄성계수 포아송비 그리고 일축압축강도를 실험실 시험값과의 상대오차 % 내외로 재현할 수 있었다.