• 한국정밀공학회지
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• 제19권3호
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• pp.131-136
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• 2002

A design system of dies for hot extrusion of structural shapes such as Z's, L's, T's, U's and H's from aluminium alloys was developed in this study. The developed design system of dies is based of estimated die design rule system. The design rules for die design are obtained from the handbooks, plasticity theories and relevant references. The environment of the system is AutoCAD and AutoLISP, the graphic programming language was used for the configuration of the system. This system includes five major modules such as section shape design module, die opening number module, die opening layout module, die correction module and die bearing design module that are used to determine design variables. This system would be used to design of dies for hot extrusion from aluminum alloys and widely used in manufacturing course.

• 교육시설 논문지
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• 제24권6호
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• pp.27-36
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• 2017

Educational facilities have an affect to make a decently learning environment. After constructed, it needs a maintenance plan to keep the performance or function which provide the repair time, repair scope and ratio. But the fundamental data are so insufficient that the field worker can't provide the maintenance plan and has no choice use the other data which concerned with apartment or office building. Above all, the service life is indispensible to make a repair plan because the repair time and scope would be provided within the service life. This study aimed at providing the method to make a service life of component in educational facilities and applying the method into the roof proof and floor finishing. Results are shown that first, it is important to set the $1^{st}$ repair time after constructed. when it proposes the three ways with the probability approach, choice probability model and cumulative cost function. Second, the service life of roof proof is provided with about 35 years. In addition, the service life of the floor finishing is about 40 years. These result would be utilized to conduct the repair plan under the service life.

• Journal of Microbiology and Biotechnology
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• 제24권3호
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• pp.379-385
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• 2014

The purpose of this study was to compare the ability of an engineered Escherichia coli to degrade chlorpyrifos (Cp) using an organophosphorus hydrolase enzyme, encoded in both Flavobacterium sp. ATCC 27551 or Pseudomonas diminuta, by employing the Lpp-OmpA chimera and the N-terminal domain of the ice nucleation protein as anchoring motifs. Tracing of the expression location of the recombinant protein using SDS-PAGE showed the presentation of OPH by both anchors on the outer membrane. This is the first report on the presentation of OPH on the cell surface by Lpp-OmpA under the control of the T7 promoter. The results showed cell growth in the presence of Cp as the sole source of energy, without growth inhibition, and with higher whole-cell activity for both cells harboring plasmids pENVO and pELMO, at approximately 10,342.85 and 10,857.14 U/mg, respectively. Noticeably, the protein displayed by pELMO was lower than the protein displayed by pENVO. It can be concluded that Lpp-OmpA can display less protein, but more functional OPH protein. These results highlight the high potential, of both engineered bacteria, for use in the bioremediation of pesticide-contaminated sources in the environment.

• 한국도로학회논문집
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• 제15권1호
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• pp.75-86
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• 2013

PURPOSES: The purpose of asphalt pavement reducing surface temperature by using Pipe cooling system is to make pleasant city life environment. METHODS: We considered building condition to lay the pipes under asphalt pavement and figured out that temperature reducing effect with pipe cooling system. In addition, we guessed rutting through wheel tracking test with a laid the pipes under asphalt mixture and performed fatigue cracking through a flexural fatigue test for performance evaluation of pipe cooling system. RESULTS: When pipe cooling system worked, the temperature of pavement model reduced quickly in test. The system can turn down the degree by 4 or 5 quickly as well. It didn't affect rutting to lay the pipes under the pavement, but it can get damaged to asphalt pavement in early stage by the result of performance evaluation. CONCLUSIONS: We figured out that pipe cooling system can turn down the temperature of aspalt pavement surface through tests. We suggest that pipe cooling system should be considered one of the effective way to solve urban heat island problem.

• 자원환경지질
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• 제24권4호
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• pp.447-463
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• 1991

본 논문은 슈피리어호 남부에 분포하는 선캠브리아기의 염기성 암맥들에 대하여 마그마의 기원과 그들이 생성될 당시의 지구조적인 환경을 알기 위하여 암석 및 지화학적인 연구가 행하여 졌다. 46개의 시료에 대한 주성분, 미량원소 및 희토류 원소들에 대한 화학분석이 이루어졌다. 이들의 화학성분은 전형적인 콘티넨탈 쏠레아이트 (contiental tholeiite)의 성격을 띄우며, 다소 철성분이 부화된 분화경향을 나타낸다. 부동원소 (immobile element)들을 이용한 tectonic discrimination diagram 에 의하면 모 마그마는 현재의 T-type MORB와 유사한 Ti의 함량이 많은 쏠레아이틱(tholeiitic)현무암으로 사료된다. 분화가 진행될수록 암석의 화학적 성질은 지각과의 동화작용(crustral asimilation)에 의해 많은 영향을 받는 것으로 나타난다. 분화가 많이 진행된 암석들은 Rb, K, Ba, Th 과 같은 LIL원소의 증가를 보인 반면에 Nb, P, Ti과 같은 HFS 원소들은 그들과 물리, 화학적 성질이 비슷한 이웃한 원소들보다 현저한 감소를 나타내었다. 이러한 특징은 마그마의 기원에서 유래된 것 뿐만 아니라 지각과의 동화작용이 병행함으로 기인되었다고 사료된다. 이 암석들의 지화학적 특성을 살펴보면 지각의 섭입과 관련되어(subduction related)생성된 암석의 화학성분과는 현저한 차이를 나타내며, 판(板)내에서 생성된 현무암(Within plate basalt)과 해양지각에서 형성된 현무암 (MORB)에서 보이는 특성을 나타낸다. 이러한 지화학적인 특성을 살펴볼 때 이 암석들은 rifting과 같은 extensional tectonic 환경에서 생성된 것으로 사료된다.

• 한국응용곤충학회지
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• 제52권4호
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• pp.403-408
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• 2013

수출용 심비디움에 발생하는 해충의 종류와 해충관리 현황을 알아보고자 국내 주요 재배단지 10개 지역 45농가를 대상으로 조사를 실시하였다. 농가에서 채집된 해충의 종류는 응애류(20농가), 깍지벌레류(6농가), 민달팽이류(6농가), 총채벌레류(8농가), 진딧물류(5농가) 노린재류(1농가) 등이었다. 채집한 해충은 현미경을 이용하여 동정한 결과 점박이응애(Tetranychus urticae Koch), 대만총채벌레(Frankliniella intonsa Trybom), 난초핀깍지벌레(Pinnaspis aspidistrae Signoret), 민달팽이(Incilaria confusa Cockarel), 썩덩나무노린재(Halyomorpha brevis Walker), 복숭아혹진딧물(Myzus persicae Sulzer), 목화진딧물(Aphis gossypii Glover), 무화과깍지벌레(Coccus hesperidum Linnaeus)와 소형달팽이류 1종으로 나타났다. 총채벌레 산란피해로 의심되는 증상의 정확한 동정을 위해 rDNA의 ITS2 부위를 PCR-RFLP 한 결과 아까시총채벌레(Thrips flavus Schrank)와 파총채벌레(Thrips tabaci Lindeman)로 확인되었다. 따라서, 수출 심비디움을 재배하는 농가에서는 이러한 해충들에 대한 종합적인 방제대책을 수립하여 실천하는 것이 필요할 것으로 생각된다.

• 한국환경과학회지
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• 제20권12호
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• pp.1625-1634
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• 2011

The aim of this study is to clarify what influence has on elementary school children's environmental awareness in time of teaching environmental problems from an animistic viewpoint and from non-animistic viewpoint. For this purpose, this study carried out its research targeting 126 students in fourth grade at M elementary school located in U Metropolitan City. This study suggested the environmental problems by re-edifying the already suggested environmental problems from an animistic viewpoint to 62 students for two classes which were classified as an experimental group after sampling 10 cases of the representative environmental problems that might derive from the earth system, and conducted the class on 10 main topics relevant to the problematic situation of environment with an animistic viewpoint excluded targeting the remaining 64 students forming a comparison group. The results of this study were as follows: First, there appeared an ex-ante ex-post statistically significant difference in the awareness of environmental problems from the experimental group which received an environmental class from an animistic viewpoint. However, there didn't appear a statistically significant difference from the comparison group. This study interprets this result to mean that elementary students' awareness of environmental problems increase because they think about the environmental problems by associating them with a problem of life when the students receive the environmental class from an animistic viewpoint. Second, there appeared an ex-ante ex-post statistically significant difference in the awareness of environmental problems from the experimental group which received an environmental class from an animistic viewpoint. However, there didn't appear a statistically significant difference from the comparison group. Regarding this aspect, this study believes that the experimental group shows much higher willingness to environmental act in comparison with the comparison group because elementary school students think of inanimate objects as living things.

• 한국전문물리치료학회지
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• 제19권1호
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• pp.66-75
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• 2012

The purpose of this study was to identify the effects of two types of stretching extensor carpi radialis on the visual analog scale (VAS), pressure-pain thresholds (PPTs), grip strength (GS), and strength of wrist extensor (SWE) in patients with lateral epicondylalgia. Sixteen patients with lateral epicondylalgia were recruited for this study and randomly assigned to two groups; the conventional stretching group (CS) and the stretching of proximal functional massage group (PFM); the VAS, PPTs, GS, and SWE were measured before and after the intervention. Over a period of stretching exercises were performed for five minutes per day, five days per week. The paired t-test and Wilcoxon signed-rank test were used to determine the statistical differences in the VAS, PPTs, GS, and SWE (pre- and post-test). The Independent t-test and Mann-Whitney U test were used to compare the effects of stretching exercises between the CS and PFM groups. The results of this study demonstrated that in the PFM group, the PPTs, GS, and SWE significantly increased, and the VAS decreased (p<.05). In the CS group, the VAS and GS increased significantly after the three-week intervention (p<.05). Pain was decreased and strength (GS and SWE) was increased in the PFM group, compared to the CS group (p<.05). The findings of this study indicate that PFM technique can be applied for decreasing pain and increasing the GS and SWE in patients with lateral epicondylalgia.

• 디지털산업정보학회논문지
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• 제4권2호
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• pp.67-74
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• 2008

Entering the 21st century, the primary influence leading world economy have been shifting. U.S. economy has seemed to slow down, Japan and EU are also in same situation. But China have started to lead Asia economy and expended to the World. According to Goldman Sachs Group, "The 21st century will be a era of Brics because of their enormous territory, a large population and abundant natural resources." We have to more focus on China because China have directly effect on Korean market and have a great potential market opportunity for our industries. However, this report mentioned above didn't carefully deal with a field of information and technology(from here IT), Digital contents consumption wasn't mentioned at all. Now Digital Contents (from here 'DC') emerge as new value creator and actually Korea has been a dominant in IT industries and is leading Digital contents market in China. This phenomenon is called as 'Korean wave (Han-Ryu)'. Many researchers have studied about 'Korean wave(Han-Ryu)' focusing on the economic effect but Korean DC industries need to build specifical strategies for exporting Korean DC to China market. Therefore, purpose of this study is following : Firstly, to analyze environment of DC in China and competitive advantages of it. Secondly, to compare ICAI (Industrial Comparative Advantage Index) according to a kind of DC. Finally, to make an analysis of China consumer's attitude to DC. This study will give much implication for Korean DC industries to enter China market.

• 전자공학회논문지T
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• 제35T권1호
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• pp.67-74
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• 1998

자동차 배기가스의 증가요인인 실화발생을 감지하고 실화가 발생하는 기통까지 판별하기 위하여 종래에는 크랭크각속도를 측정하는 방법을 이용하였으나 이 방법은 고속의 회전시 감지가 어려운 문제를 가지고 있다. 이러한 문제를 해결하기 위해서 본 논문은 이산 월쉬-푸리에(Walsh Discrete Fourier Transform; WDFT)를 이용하여 고속의 엔진회전수에서도 실화발생여부를 판단 가능하게 하였고, 월쉬함수의 Moving window방식을 이용하여 다기통 실화발생에 대한 기통판별까지 가능하게 하였다. 이상의 내용을 시스템으로 구현하여 무부하 Idle상태와 운전상태(Drive)에서 시험한 결과도 실화발생여부를 감지하는데 기존의 방법보다 더 효과적임을 알 수 있었다.