• 한국군사과학기술학회지
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• 제11권6호
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• pp.127-134
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• 2008

An autonomous reconnaissance ground robot performs its duty in various different environments such as mountain-scape, desert and under-water through changing its shape and form according to the environment it is working in. Making a prototype robot for each environment requires extra cost and time. It is also difficult to modify the problem after production. In this paper, we propose the adoption of M&S(Modeling & Simulation) environment for the production and design of the autonomous reconnaissance ground robot. The proposed method on the M&S environment contributed to the more effective and less time consuming production of the robot through the Pre-Modeling and Pre-Simulation process. For example, we showed the design and implementation of the autonomous reconnaissance ground robot under the proposed environment and tools.

• KIEAE Journal
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• 제15권3호
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• pp.15-20
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• 2015

Purpose: Suggesting a working prototype of a kinetic light shelf unit and revealing its energy efficiency by a series of building performance simulations were presented. Recently, kinetic building envelope has been an emerging technology as an innovative way to control exterior building environment, but products from many researches about the facade could not been reached to the industrialization so far. That is because its initial installation, operation and maintenance costs are still too high to use for the practical field, although buildings using kinetic envelopes could decrease their energy consumption significantly. This narrow point of view needs to be reconsidered, since buildings require great amount of energies to run their functions through the whole life and using better building components can lead to achieve much more benefits in aspects of the lifecycle cost (LCC). Method: A series of certified simulation tools like Ecotect and Green Building Studio that are normally used for researches and developments in the field of architecture were utilized. Result: Based on simulation analyses, the result of the study has showed that the proposed system definitely has adaptability to the professions and positively shows practicability as advanced integrative building envelopes with renewable energy association.

• 한국진공학회지
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• 제8권4B호
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• pp.565-571
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• 1999

In this study, high-density plasma etching characteristics of ITO(indium tin oxide) films used for transparent electrode in dispaly devices were investigated. Plasma diagnostic and surface analysis tools were used to understand etch reaction mechanism. The etch rate of ITO was increased by the increase of reactive radicals such as H and $CH_3$ with the addition of moderate amount of $CH_4$ to Ar. However, the addition of excess amount of $CH_4$ decreased possibly due to the increased polymer formation on the ITO surface being etched. The increase of source power and bias boltage increased ITO etch rates but it decreased selectivities over under-layers $(SiO_2, Si_3N_4)$. The increase of working pressure up to 20mTorr also increased ITO etch rates, however the further increased of the pressure decreased ITO etch rates. From the analysis of XPS, a peak related to the polymer of hydrocarbon was observed on the etched ITO surface especially for high $CH_4$ conditions and it appears to affect ITO etch rates.

• 디지털콘텐츠학회 논문지
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• 제19권3호
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• pp.497-503
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• 2018

엔터프라이즈 리눅스 시장의 대표주자인 RHEL 7에서 기본 파일 시스템을 EXT에서 XFS로 변경하면서 파일 시스템의 크기, 파일 크기 등과 같이 최대 지원 사양을 대폭 증가시켰다. 단순히 지원 사양만 증가시킨 것 아니라, 데몬 기반으로 동작하면서 고용량 디스크 및 SSD(solid state drive)와 같은 고성능 디스크에서 탁월한 성능을 보이는 것으로 나타나고 있다. 파일 시스템의 변경은 관련 명령어의 변경, 백업 도구의 변경, 디스크 쿼터 설정 변경과 같은 직접적인 운영 기법의 변화를 의미한다. XFS 파일시스템의 변경은 리눅스 시스템 운영에 많은 변화를 주고 있지만 서버 분야에서 차지하는 리눅스 운영체제의 위치를 더욱 굳건히 하게 되는 계기가 될 것으로 판단된다.

• 한국가정과교육학회지
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• 제13권3호
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• pp.35-57
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• 2001

The purposes of this study were to investigate the current status on stating a summary of assessments in the practical arts education and to analyze the problem and find out the reformation strategy for them. To achieve these purposes. 180 teachers working in all elementary schools located in Daegu-city was selected by systematic cluster sampling method. The data were collected by using the mailed questionnaire developed by the researcher, and there was a response rate of 91.7%. Findings showed that it was not realized the valid and reliable stating a summary of assessments because it was not fixed throughly in the elementary school. So many teachers had difficulties in assessing the practical arts subject and stating a summary of assessments. They used the computer programs of CMI(Computer Management Instruction) . Black Box. SA(Stand Along) for stating a summary of assessments. It was recommended that valid and reliable criteria of stating a summary of assessments should provided, and on-the-job training on the developing and selecting a good tools for stating a summary of assessments should required. And. it was also required that the various codes of stating a summary of assessments should developed. and the various materials. equipments. and systems should provided for teachers.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.968-973
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• 2003

As environmental restrictions have continuously become more strict, it has emphasized development of environment-friendly technologies. In cutting technology, it has been well recognized that cutting fluids might have undesirable effects on worker's health and working environment and, hence, recently there have been numerous attempts to minimize harmful effects of cutting fluids on environments. To minimize the use of cutting fluids in machining, conventional cutting fluids have been replaced with the technologies of pressurized cold air and minimum quantity lubrication(MQL). Compared with milling, turning is a continuous cutting process, where tools are continuously heated up and lack of lubricity could lead to tool wear and deteriorated surface roughness. In this study, it has been investigated how tool wear and surface roughness could be affected by cutting conditions, supply and cooling methods. The experimental results show that MQL technology is able to minimize harmful effects of conventional cutting fluids.

• 한국기계가공학회지
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• 제19권2호
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• pp.1-8
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• 2020

While dental clinics still use the ultrasonic scaling/surgery tool for teeth scaling and cleaning the tool's use is expanding steadily to include treatment of damaged teeth and bone tissue. In this study, a handpiece moving system (HMS) was developed to evaluate bone scaling and cutting in the field of dentistry. The HMS, through a scaling test of bone using a scaler tip, it was able to identify surface damage. Additionally, a thermos-graphic camera was used to observe the temperature distribution that occurred during the bone scaling and cutting process. Consequently, we found that increasing the working load increased the amount of surface damage. Changes in temperature distribution occurred slowly and were maintained within safety bounds for 10 minutes. Going forward, we will compare the HMS performance on scaling and cutting with other devices.

• 부모자녀건강학회지
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• 제19권1호
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• pp.17-24
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• 2016

Purpose: This study examined the level of students' anxiety depending on the injection type, education methods, and the students' characteristics. Methods: 209 first year nursing students were randomly assigned to each group by three factors -injection methods, video watching, and number of practice. Injection methods had two levels (IV and IM). Video watching also had also two levels (video watching and non-watching group). And the number of practice had 4 levels according to number of practice (2, 4, 6, and 8 times). The video watching group was watching 30 minutes video before manikin practice. After 5 to 15 minutes of manikin practice, the sufficiency of practice and the level of anxiety were measured. The data were analyzed by t-test and one way ANOVA. Results: The anxiety of the IV practice was higher than that of IM. The students who have experiences of working at hospital or the similar institution were lower in anxiety. The higher self-confident in sufficiency of practice lowered the students' anxiety. But watching video and the number of practices had no effects on the level of anxiety. Conclusion: To effectively lower the anxiety of nursing students in the nursing practice education, lecture methods and education tools are needed to develop.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.21-26
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• 2003

The visualization of three dimensional geophysical data is forcing a revolution in the way of working, and allowing the discovery and production of hydrocarbons at much lower costs than previously thought possible. There are many aspects of this revolution that are behind the scenes, such as the database structure, the storage and retrieval of data, and the exchange of data among programs. Also the user had changes where the interpreter (or manager, or processor) actually looks at and somehow interacts with the data. The use of opacity in volume rendering, and how its judicious application can assist in imaging geologic features in three dimensional seismic data. This revolutionary development of new technology is based on the philosophy of synergy of inter-disciplines of the oil industry. Group interaction fostered by large room visualization environments enables the integration of disciplines we strive for, by putting the petrophysicist, geologist, geophysicist, and reservoir engineer in one place, looking at one image together, without jargon or geography separating them. All these tools developed in the oil industry can be applied into the civil engineering industry also such as the prior geological and geophysical survey of the constructions. Many examples will show how three dimensional geophysical technology might make a revolution in the oil business industry now and in future. This change can be considered as a fusion process at data, information, and knowledge levels.

• 한국정밀공학회지
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• 제19권10호
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• pp.221-226
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• 2002

As environmental restriction has continuously become more strict, machining technology has emphasized on development of environment-friendly technologies. In cutting technology, it has been well recognized that cutting fluids might have undesirable effects on workers health and working environment and, hence, recently there have been numerous attempts to minimize harmful effects of cutting fluids on environments. To minimize the use of cutting fluids in machining, conventional cutting fluids have been replaced with the technologies of pressurized cold air and minimum quantity lubrication (MQL). Compared with milling, turning is continuous cutting process, where tools are continuously heated up and lack of lubricity could lead to tool wear and deteriorated surface roughness. In this work, it has been investigated how tool wear and surface roughness could be affected by cutting conditions, supply and cooling methods. The experimental results show that MQL technology is able to minimize conventional cutting fluids.