• 한국산업융합학회 논문집
• /
• 제23권6_2호
• /
• pp.1059-1065
• /
• 2020

Demand for pressure sensors is increasing in various fields such as machinery, healthcare and medical care. A recent study is being conducted to create sensors that are more sensitive and have longer linear sections based on measurement principles. In this paper, a film-type sensor with a membrane structure was developed to measure the pressure distributed in the axial direction of a hot roll laminator. Performance of sensors was evaluated by resistance and durability according to membrane diameter. The resistance of the membrane sensor varies according to the contact state and contact area of the electrode. Therefore, the membrane diameter selection is important. Experiments showed the most pronounced variation in resistance under pressure at 8 mm in diameter of membrane. Reliability evaluation of sensors was carried out at room temperature and high temperature. The pressure on the sensor was pressurized 1000 times to measure the initial resistance and the resistance after the evaluation to analyze the change. Sensors showed stable results with low resistance changes of 5.15% and 6.27%, respectively. A large area sensor manufactured using the developed sensor also showed reliable results.

• 천문학회지
• /
• 제34권4호
• /
• pp.281-283
• /
• 2001

As a companion to an adiabatic version developed by Ryu and his coworkers, we have built an isothermal magnetohydrodynamic code for astrophysical flows. It is suited for the dynamical simulations of flows where cooling timescale is much shorter than dynamical timescale, as well as for turbulence and dynamo simulations in which detailed energetics are unimportant. Since a simple isothermal equation of state substitutes the energy conservation equation, the numerical schemes for isothermal flows are simpler (no contact discontinuity) than those for adiabatic flows and the resulting code is faster. Tests for shock tubes and Alfven wave decay have shown that our isothermal code has not only a good shock capturing ability, but also numerical dissipation smaller than its adiabatic analogue. As a real astrophysical application of the code, we have simulated the nonlinear three-dimensional evolution of the Parker instability. A factor of two enhancement in vertical column density has been achieved at most, and the main structures formed are sheet-like and aligned with the mean field direction. We conclude that the Parker instability alone is not a viable formation mechanism of the giant molecular clouds.

• 구강회복응용과학지
• /
• 제23권1호
• /
• pp.31-42
• /
• 2007

The purpose of this study was to compare the stress distribution according to the splinting condition and non-splinting conditions on the finite element models of the two units implant prostheses. The finite element model was designed with the parallel placement of two fixtures ($4.0mm{\times}11.5mm$) on the mandibular 1st and 2nd molars. A cemented abutment and gold screw were used for superstructures. A FEA models assumed a state of optimal osseointegration, as the bone quality, inner cancellous bone and outer 2 mm compact bone was designed. This concluded that the cortical and trabecular bone were assumed to be perfectly bonded to the implant. Splinting condition had 2 mm contact surface and non-splinting condition had $8{\mu}m$ gap between two implant prosthesis. Two group (Splinting and non-splinting) were loaded with 200 N magnitude in vertical axis direction and were divided with subdivision group. Subdivision group was composed of three loading point; Center of central fossa, the 2 mm and 4 mm buccal offset point from the central fossa. Von Mises stress value were recorded and compared in the fixture-bone interface and bucco-lingual sections. The results were as follows; 1. In the vertical loading condition of central fossa, splinting condition had shown a different von Mises stress pattern compared to the non-splinting condition, while the maximum von Mises stress was similar. 2. Stresses around abutment screw were more concentrated in the splinting condition than the non-splinting condition. As the distance from central fossa increased, the stress concentration increased around abutment screw. 3. The magnitude of the stress in the cortical bone, fixture, abutment and gold screw were greater with the 4 mm buccal offset loading of the vertical axis than with the central loading.

• Child Health Nursing Research
• /
• 제8권3호
• /
• pp.322-333
• /
• 2002

Purpose: The purpose of study was : 1) to analyse the trend of research on the sensory stimulation in newborn in Korea, 2) to suggest direction for further study on the sensory stimulation in newborn and contributing to the use of intervention in newborn. Method: Research studies on the sensory stimulation in newborn were selected from the dissertations, parents-child health. Academic Society Journal, and from Korean Journal of Pediatrcs which were conducted between 1984 and 2002. The total numbers of the studies were 15. These studies were analyzed for 1) time of publication or presentation 2) thesis for a degree or nondegree 3) characteristics of subjects 4) sample size 5) research design 6) type of sensory stimualtion 7) meaurement tool 8) result. Result : 1)The most year of studies were the 1996's～ 2000's. 2) The degree of studies were higher than nondegree. 3) The most characteristics of subjects were the premature infants. 4) The most frequent sample sizes were 11-20. 5) The all research design was nonequivalent control group pretest-posttest design in quasi experimental basis. 6) The most type of sensory stimulation was Field massage(tactile and kinesthetic). 7) The measurement tool used all objective tools. 8) The most research data were collected by the measure of the weight, heart rate, behavior state, respiration, stress hormon and positive results. Conclusion: 1) Human sensory stimulation did not seem to harm the infants. 2) several positive effects of sensory stimulation that have been reported previously must be reevaluated. 3) further research will be required large sample size, long-term outcome, individualized stimulation program, early parent-infant contact in order to enhance the development of attachment, to determine the underlying mechanism and theorical frame for these stimulation effect.

• 한국자동차공학회논문집
• /
• 제22권1호
• /
• pp.117-125
• /
• 2014

The temperature distribution of steady state rolling tires with detailed tread blocks is numerically predicted using the three dimensional full patterned tire model. A three dimensional periodic patterned tire model is constructed by copying 1-sector mesh in the circumferential direction. Using the static tire contact analysis, the strain cycles during one revolution are approximated with the strains at Guassian points of the elements which are sector-wise repeated within the same circular ring of elements, by neglecting the tire rolling effect. Based upon the multi-axial fatigue theory, the maximum principal strain is used to represent the combined effect of six strain components on the hysteretic loss. In the following, the deformation due to the inflation and vertical load is calculated using ABAQUS. Then heat generation rate in each element is calculated using an in-house code. Lastly, temperature distribution is calculated using ABAQUS again. Through the numerical experiments, the validity of the proposed prediction method is examined by comparing with the experiment and the temperature distribution of a patterned tire model is compared with those of the main-grooved simple tire model.

• 시큐리티연구
• /
• 제14호
• /
• pp.311-336
• /
• 2007

본 연구는 생물테러리즘의 발생시 이에 대응하는 개념과 선진국들의 생물테러리즘의 대응태세를 알아본 후 한국의 대응태세를 알아보는 연구이다. 생물테러리즘의 발생에 대응하는 태세는 사건의 발생 흐름에 따라 탐지단계, 보호단계, 진단단계, 제독 및 해독단계로 구분해 볼 수 있다. 탐지단계는 한국은 접촉식으로 개발하고 있으나, 선진국에서는 원거리에서 탐지할 수 있는 장비를 개발하고 있다. 한국도 원거리에서 탐지할 수 있는 체계를 개발해야 할 것이다. 접촉식 장비도 민삼하게 작동할 수 있는 장비로 발전 되어야 한다. 보호장비중 한국의 방독면은 세계적으로 그 품질이 우수하나, 기타 피복류 등에 대해서는 첨단 과학기술을 적용할 수 있도록 개선되어야 한다. 진단 장비도 초동조치팀이 현장에 출동해서 즉시 판단할 수 있도록 하는 장비로 개발되어야 한다. 제독을 위한 물자는 인체에 무해하고, 장비에도 무리를 주지 않는 새로운 물질로 개선되는 추세로서 한국에도 이러한 물자가 확보되어야 한다. 해독을 위한 기술은 백신 및 항생제를 개발하는 것으로서 전 세계적으로 노력을 공유하여 개발할 필요가 있으며, 이를 위해 한국의 의료기술을 더욱 발전시킬 필요가 있다. 이외에도 대응매뉴얼, 훈련 모델, 공보 노력, 트라우마 증후군 대비 등의 노력을 기울여야 할 것이다.

• 마케팅과학연구
• /
• 제20권3호
• /
• pp.239-248
• /
• 2010

本文阐述了产业和学术之间的合作项目. 这个合作项目关注美国东北部的一家大型地区连锁百货商店的两个自有品牌服装的营销和产品开发战略发展. 这个项目的目标是通过和学生的想法的合作来振兴产品线. 从而给学生提供真实产业环境中的实践经验. 这个项目中有很多关键者. 在美国东北部的一家私有连锁百货商店为已有的两个自有服装品牌寻求一个学术伙伴. 他们的目标客户是追求休闲, 适中价格的中年消费者. 这个公司想要改变包装和展示的方向, 甚至是产品的设计. 公司的品牌和产品开发部门联系东北一个州立大学的学术部门的教授. 有两位教授认为这个项目非常适合他们的课程-一个是初级的媒介品牌管理课程; 一个是高级的时装产品开发课程. 这些教授认为通过合作项目, 学生在安全的学术学习环境中能进入一个真实的工作场景中在一个多学科协作团队, 提供超出一个学生的能力, 经验和资源优势, 并增加了解决问题的过程中的 "智囊" (Lowman 2000). 这种提高学生的能力目标的方向让每班教师去组织品牌和产品开发类的跨学科团队. 此外, 许多大学都聘请科研和教学的产业伙伴关系, 协作的时间(学期)和环境(教室/实验室)的约束有助于提高学生的知识和对现实世界的经验. 在田纳西大学, 产业服务中心和UT-Knoxville's 工学院和一家公司合作来发展它们美国公司的的设计进步. 本研究中, 因为是和一个自有商标零售品牌, Wickett, Gaskill 和Damhorst's (1999) 指出产品开发和品牌管理团队使用的零售服装产品开发模型. 之所以选择这个框架是因为它从零售这个角度强调了服饰产品开发. 两个班级参与了这个项目: 一个初级品牌管理班级和一个高级时装产品开发班级. 7个团队包括四名学习品牌管理的学生和两名学习产品开发的学生. 这两个课程在同一个学期但是不同的时间. 在学期开始的时候, 每个班级都被介绍给了产业合作伙伴并接受了问题. 一半的团队指定为男士品牌, 另一半是女士品牌. 这些小组负责制定解决问题的方法, 制定自己的工作时间表, 在与业界代表保持接触, 并确保每个小组成员以积极的方式负责任. 这些小组的目标是通过用销售规划进程来计划, 发展和展示一条产品线(遵循Wickett, Gaskill和Damhorst 模型) 并为这条产品线发展新的品牌战略. 这些小组展示了趋势, 色彩, 面料和目标市场调查; 制定一个产品线的草图;编辑了草图, 介绍他们的执行计划书写说明书, 配上合适的模型并最终开发生产样品. 品牌班的学生完成了SWOT分析, 品牌测量研究报告, 品牌心智图和完整综合的营销报告. 这些报告在介绍新产品线时同时发表. 将来如果有更多这样的协作机会而且公司希望同时考虑品牌和产品开发战略, 那么课程应该定在相同的时间, 这样学生有更多的时间在一起讨论时间表和被分配的任务. 像上面的任务, 学生不得不每堂课之外的时间见面. 这使得团队工作变得具有挑战性(Pfaff和Huddleston, 2003). 虽然这项工作的后勤是费时设立和管理, 但教授认为对学生的好处是多种多样的. 根据两堂课的学生的回复, 最重要的好处是和产业专业人士一起工作的机会, 跟进他们的进程, 并看到公司里做决定级别的高层对他们作品的评估. 教员们都感激有一个 "真实的世界" 的案例. 制定的创意和战略扩大和加强了品牌和产品开发两个部门的联系. 通过和来自不同知识领域的学生一起工作并且和产业伙伴联系, 遵守产业活动的框架和时间表, 学生小组在新的环境中完成优秀创新的作品是具有挑战性的. 在产品开发和为 "现实生活" 品牌的品牌工作, 这些品牌都在努力给学生一个机会, 看看他们的课程是如何紧密的与现实世界联系, 以及公司运营中设计和商业方面如何需要创造性, 协作和灵活性. 行业人员对(a)学生的知识水平和深度以及执行力, (b)品牌的新思路的创造性产生了深刻的印象.