• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.166-171
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• 2001

An electric drill is a handy tool used in a machine shop, which consists of motor, gear, bearing, shaft, and case, i.e., a gear driving system. Low level vibration and noise of the electric drill can bring the assurance of the quality and reliability of the machine. The vibration sources of the electric drill should be investigated for the reduction of the vibration and noise of the system. Through the experiments in a laboratory and the various signal processing procedure for the measured vibration and sound signals, the characteristics of the vibration and noise of the electric drill are investigated. And its propagation path is sought using partial coherence technique.

• Journal of Forest and Environmental Science
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• v.24 no.3
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• pp.171-174
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• 2008

The increasing price of liquefied petroleum gas (LPG) has forced many households to shift to firewood/charcoal in the Philippines, causing tremendous pressure on the dwindling forest. This transition is more obvious in the rural area where firewood price is almost half of that in the cities. Both problems on big demand for firewood and the pressure on our forest can be partly solved by going into firewood plantation. After all, the country has vast track of idle lands, both private and government lands, waiting to be developed. What the government can do are: a) aggressive promotion of firewood plantation, b) simplify further the old technology on establishing firewood plantation to encourage more farmers, c) improve charcoal processing and d) promote the use of efficient stoves. This write up discusses the need for firewood plantation, areas available for planting, where to plant in farms, what species to plant in a particular soil type/location for optimum growth, planting methods, harvesting, marketing, and the side lights on the ecological benefits derived from plantation aside from wood.

• The Korean Journal of Community Living Science
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• v.14 no.2
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• pp.107-117
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• 2003

The purpose of this study was to investigate university freshmen' stress coping strategy and psychological wellbeing to appling ecological family life welfare model. Based on Bronfenbrenner's ecological perspective, “ecological family welfare model”, which includes person(individual attributes), context(family backgrounds), process(mechanism of development), and time (the specific period), was suggested as a new research paradigm for family welfare life research. The questionnaire study was done for 171 freshmen of an university in Pusan. The results show the suggested research model was significant and effective to explain the mechanism of stress coping strategy and psychological wellbeing. Individual attributes(i. e., attachment style) and family context have an impact on family cohesion and adaptability which in turn affect stress coping strategies which then affect individual psychological wellbeing.

• Journal of Information Display
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• v.10 no.4
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• pp.171-174
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• 2009

The optical and electrical properties of the amorphous indium gallium zinc oxide thin-film transistor ($\alpha$-IGZO TFT) were studied. When the $\alpha$-IGZO TFT was illuminated at a wavelength of 660 nm, the off-state drain current slightly increased, while below 550 nm it increased significantly. The $\alpha$-IGZO TFT was found to be extremely sensitive, with deep-level defects at approximately 2.25 eV near the midgap. After UV light illumination, a slight change occurred on the surface of the $\alpha$-IGZO films, such as in terms of the oxygen 1s spectra, resistivity, and carrier concentrations. It is believed that these results will provide information regarding the photo-induced behaviors in the $\alpha$-IGZO films.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1994.11a
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• pp.171-174
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• 1994

The drive towards ultra-large-scale integrated circuits a continuous intermetal dielectric films for multi layer interconection. Optimum condition of remote plasma enhanced chemical vapour deposition(RPECVD) was achieved by orthogonal array method. Chracteristics of SiO$_2$ films deposited by using remote PECVD with N$_2$O gas were investigated. Etching rate of SiO$_2$ films in P-echant was about 6[A/s] that was the same as the thermal oxide. The films a showed high breakdown voltage of 7(MV/cm) and a resistivity of Bx10$\^$13/[$\Omega$cm] at 7(MV/cm). The interface Trap density of SiO$_2$ has been shown excel lent properties of 5x10$\^$10/[/$\textrm{cm}^2$eV]. It was observed that the dielectric constant dropped to a value of 4. 29 for 150 [W] RF power.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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• pp.168-171
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• 1997

The purpose of this study is the development of PBL(problem-based learning) system using visual C++5.0 as a window-based application program. A patient who complains of weight loss was used in PBL case. Initial frame is made by dialog-based in MFC(microsoft foundation class). Also, sample medical images are composed of ultra-sound, chest PA, Thyroid scan, otherwise. we will make this program as CD-ROM and the internet application or computer assisted learning and continuous medical education.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.171-172
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• 2006

Most existing studies for stress analysis of teeth have employed small number of teeth, and used big element size using F-E models. Therefore, the results are not accuracy enough for showing the internal stress variation. 15 males' and 13 females' mandibular first premolar are employed for internal structure's study of teeth and small element size for a FE model are used. According to these processes, stress distribution of internal parts of teeth are well shown, and the stresses are varied a lot between enamel layer and dentine layer, but there is little variation on pulp chamber.

• Communications of Mathematical Education
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• v.18 no.1 s.18
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• pp.157-171
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• 2004

본 연구에서는 수학일지 쓰기가 중학생의 수학적 태도에 미치는 영향을 조사하기 위해서 연구 대상 반을 선정하여 수학적 태도에 관한 설문 조사를 실시하고 고안된 수학 일지를 쓰도록 한 후 수학 성적이 상 및 하에 속하는 각 3명을 대상으로 두 차례 실시한 인터뷰 자료와 인터뷰 당시 연구자가 느낀 점을 적은 메모를 바탕으로 학생들의 수학일지 쓰기에 대한 인식을 분석하는데 그 목적이 있다. 본 연구에 따르면 수학일지 쓰기는 학생들의 수학적 태도, 수학 학습에 긍정적인 영향을 주었고 교사-학생간의 관계와 교사에게 긍정적인 영향을 주었다. 후속 연구에서는 충분한 사전 조사로 일지 쓰기의 횟수와 시간을 잘 결정하고 연구 기간을 충분히 잡아 학생들의 변화를 지속적으로 관찰하며 평가와의 연계로 학생들의 적극적인 참여를 유도할 필요가 있다고 본다.

• Communications of Mathematical Education
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• v.18 no.3 s.20
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• pp.171-197
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• 2004

1999년 교육개발원에서는 초 ${\cdot}$ 중학교 영재 교육과정 시안 개발을 위한 기초연구와 수학과 영재 교육과정 시안에 관한 보고서를 발간하였는데 이 보고서에 초 ${\cdot}$ 중학교 수학과 영재 교육과정 시안이 제시되어 있다. 이 영재 교육과정 시안으로써 그 내용에 상응하는 수학 교수 ·학습 자료 개발이 절실히 요구되고 있다. 한국교육개발원에서는 영재 교수 ${\cdot}$ 학습 자료개발 및 영재교사 연수가 본격적으로 확대, 추진되고 있는 실정이며 또한 2002년${\sim}$2003년 2년간 한국교육개발원에서는 영재학생을 위한 교수 ${\cdot}$ 학습 자료를 개발하여 왔다. 이런 취지를 바탕으로 지금 우리에게 영재 교육의 시급한 문제는 초 ${\cdot}$ 중등에 필요한 다양한 영재 교육프로그램을 마련하는데 있다. 본 연구에서는 한국교육개발원에서 마련한 교재개발 지침에 따라 2005학년도 교수 학습 자료를 중학교중심으로 영재 교육 프로그램을 구현해 보고자 한다.

• International Commerce and Information Review
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• v.6 no.2
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• pp.171-191
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• 2004

Recently, RFID(Radio Frequency IDentification) is observed with government and connection enterprises as the central figure. RFID utilizing radio is a technology that enable exchange of information sensing and recognize object. RFID is expected that the practical use limits widens by territory that can form vast market such as logistics management according to RFID's low-cost aggravation as well as usage of life and improvement of performance because present R&D is gone vigorously. Because RFID is possible application everywhere if it is various service industries as well as logistics, industry spot, manufactory and place that flowing of goods is, is used, and is becoming big limelight from society several territories.