• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.243.1-243.1
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• 2010

Devices based on nanomaterials platforms are emerging as a powerful tool for ultrasensitive sensors for the direct detection of biological and chemical species. In this talk, we will report the preparation and the full characterization of electrochemical polymerization of biopolymers platforms and nano-structure formation for electrochemical detection of enzymatic activity and toxic compound in electrolyte for biosensor applications. Formation of an electroactive polymer film of two different compounds has been quantified by observing new redox peak at higher potentials in cyclic voltammogram measurements. RCT value of at various biopolymer concentration based hybrid films has been obtained from electrochemical impedance spectroscopy analysis and possible mechanism for formation of complexes during electrochemical polymerization on conducting substrates has been investigated. Biosensors developed based on these hybrid biopolymers have very high sensitivity.

• 대한기계학회논문집B
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• 제33권6호
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• pp.411-417
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• 2009

The transient shear stress response of an electrorheological fluid is investigated experimentally. The characteristic time constants of an electrorheological fluid sheared between two concentric cylinders were obtained under various electric field strengths and shear rates. Also, two experimental modes are adopted to investigate the effect of the shear flow on the dynamic behavior of the fluid; one is that the electric field is induced before shearing, and the other is the electric field is induced after shearing. From the difference in the response time between two modes, the cluster formation time were obtained. The response times were decreased with the increase of the shear rate, irrelatively of the electric field strength. The cluster formation time were monotonically increased with increase of shear rate, and thereafter, were converged with a certain value.

• Journal of applied mathematics & informatics
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• 제15권1_2호
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• pp.425-434
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• 2004

Pattern recognition in three dimensional image is highly sensitive to assigned value and formation of voxels (pixels for two dimension case). However, occurred while digital imaging, digitization error leads to unpredictable noises in image data. Skeletonization, a powerful tool of pattern recognition, is sensitively dependent on boundary formation. Without successful controlling of the noises, the results of skeletonization can not be allowed as a stable solution. To minimize the effect of noises affecting to boundary formation, we developed a robust processing method useful in skeletonization technique for pattern recognition. Finally, we provide rigorous test results achieved throughout simulation on analytic three dimensional image.

• Journal of Yeungnam Medical Science
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• 제16권2호
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• pp.155-168
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• 1999

Osteoporosis is one of the most important public health problems facing the aging population. Drug therapy for osteoporosis can be divided operationally into two main categories: drugs that inhibit bone resorption, and thus reduce bone turnover, and those that stimulate bone formation, exerting an anabolic effect. Antiresorptive agents such as estrogens, calcitonin, and bisphosphonates are most effective in the prevention of osteoporosis. Formation-stimulating agents such as sodium fluoride or monofluorophosphate, parathyroid hormone fragments, and anabolic steroids are of potential value in the treatment of established osteoporosis, where bone mass is already low and benefit from antiresorptive drugs is likely to be small Recently, raloxifene, a selective estrogen receptor modulator, has become available in various countries for clinical use in the treatment of involutional osteoporsis. This paper will review the use of these drugs in postmenopausal woman.

• The Journal of Advanced Prosthodontics
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• 제12권1호
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• pp.9-14
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• 2020

PURPOSE. The aim of this study was to investigate the effect of different numbers of heat treatments applied to superstructure porcelain on optical, thermal, and phase formation properties of zirconia. MATERIALS AND METHODS. Forty zirconia specimens were prepared in the form of rectangular prism. Specimens were divided into four groups (n = 10) according to the number of firing at heating values of porcelain. Color differences and translucency parameter were measured, and X-ray diffraction (XRD) analysis and differential scanning calorimetry (DSC) were performed. Data were analyzed with analysis of variance (ANOVA). RESULTS. There were no statistically significant differences in ∆E, TP, L, a, and b value changes of the zirconia specimens as a result of repetitive firing processes (P>.05). CONCLUSION. Although additional firing processes up to 4 increase peak density in thermal analysis, additional firing processes up to 4 times can be applied safely as they do not result in a change in color and phase character of zircon frameworks.

• Journal of Welding and Joining
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• 제19권3호
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• pp.317-324
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• 2001

This study deals with high power Nd:YAG laser welding of thin steels for small pressure vessels. Full penetration welding at the overlap joint was performed so as to assure sufficient weld strength. Results showed that mid-depth weld size reduced drastically with increasing the travel speed. Position of focus had little effect on the bead formation even though short focal system was used. However, the shape factor and the bead width had closely related with the position of focus. Based on the microstructural inspection, acceptable weld was obtained when the overlap clearance was controlled up to 20% of the base metal thickness. In the case that the joint contained more clearance than the critical value, both the tensile shear strength and the tear strength were reduced. Results also demonstrated that shielding gases were proved to play a key role as far as the bead formation characteristics was taken into consideration. Blowing dry air through 5mm in diameter nozzle produced narrower bead cross-section than that of argon or nitrogen shielding.

• 한국농촌건축학회논문집
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• 제13권3호
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• pp.11-20
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• 2011

The present age demands a change in attitude based on a differentiated life value from city. It will provide to a fundamental solution for the gap of living level in the farming and fishing communities and recreate distinguishing comfortable communities. The purpose of this study was to deduct the formation characteristics of the townscape of Korean slow city according to analyze resources and structure of landscape. Planning of slow city's townscape is a process of imagification of filtrate unique meaning. The glob share synchronic unique values by slow city's network. Therefore instead of putting emphasis on promoting tourist business for short-term revenue, it will be under control to raise the standard of living and to be not forfeited and diluted the rights for sustainable slow city's status. Participation of resident needs in this process. Accordingly it need a strategy of landscape formation design and a interdepartmental practice system for a continuous slow city's image by renewal of disharmonious townscape in the built-up area.

• 복식문화연구
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• 제16권5호
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• pp.863-877
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• 2008

The purpose of this study is to investigate the effect of dot pattern size(0.8, 1.8, 2.5, 5, 8), color combination (BG/R, Y/B), value tone(lt/dk, p/g), area-ratio on image information. Sets of stimulus and response scales(7 point semantic) were used as experimental materials. The stimuli were 20 color pictures manipulated with the combination of dot pattern size, color combination, value tone and area-ratio using computer simulation. The subjects were 240 female undergraduates living in Gyeongsangnam-do. Image factor of the stimulus was composed of 4 different components, visibility, chastity.feminity, cuteness and attractiveness. In the visibility, color combination, value tone, area-ratio, dot pattern size showed independent effect. In the chastity feminity, color combination, value tone, showed independent effect. In the cuteness, value tone, area-ratio, dot pattern size showed independent effect. Significant interaction effects of color and area-ratio combination on visibility and cuteness were found. Interaction efforts of color and value tone combination, value tone and area-ratio was significant on cuteness. For visibility image, BG/R combination of color and yellow background/blue dots were effective. For cuteness image, pale/grayish tone and background/dots area-ratio were effective.

• 동아시아식생활학회지
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• 제22권1호
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• pp.133-146
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• 2012

대학교 푸드 서비스는 단체급식이나 그 외 상업급식에 비해 그 동안 주목을 받지 못하였다. 경영자 및 연구자들은 지각된 가치는 소비자 행동에 큰 영향을 미치는 것으로 인식하고 있다. 그러나 대학교 푸드 서비스에서 만족도에 영향을 주는 가치의 매개역할은 아직 확실히 증명되지 않은바 있다. 본 연구에서는 대학교 푸드 서비스의 가치, 만족도와 재방문 의사 속성들 간의 영향관계를 밝혀 고객 지향적인 대학교 푸드서비스 마케팅의 전략방안을 제시하고자 한다. 따라서 대학교 푸드 서비스의 서비스 속성이 가치에 영향을 미치는지 여부를 확인하고, 이것이 고객만족과 재방문의사를 형성하는데 있어서 매개변수로서의 역할을 증명하고자 한다. 본 연구는 국내 3개 대학의 학생들을 대상으로 진행되었으며 구조방정식모형(Structural Equation Modeling)이 적용되었다. 연구결과 대학교 푸드 서비스에서 식품, 메뉴, 편리함 등의 속성은 대학교 푸드 서비스의 가치에 긍정적인 영향을 미친다는 결과를 나타냈으며 가치는 대학교 푸드 서비스의 만족에 간접영향을 나타내는 것으로 분석되었다. 본 연구는 대학교 푸드 서비스의 가치를 통해서 만족도에 대한 가치의 매개 역할이 증가함을 알 수 있었다. 또한, 가치를 통해 증가된 만족도는 재방문의사를 도출해 낸다. 본 연구는 대학교 푸드 서비스 분야에서 고객만족을 형성함에 있어 가치의 매개역할을 증명함으로써 학문적 시사점을 기여하고 있다. 또한, 레스토랑 경영자나 마케터들에게는 대학교 푸드 서비스에 가치를 고려한 제품과 서비스 제공하는 마케팅 전략수립을 위한 기초자료로 활용될 수 있을 것으로 기대된다. 이러한 대학교 푸드 서비스에 대한 가치연구는 시장세분화, 제품차별화, 포지셔닝정책 등의 향후 연구를 도출해 내는데 의미 있는 결과를 제시할 것으로 사료된다. 또한 장기적 안목에서는 학생모집, 학생학업평가 및 대학 명성 등 전체 대학경험과 그 외 경쟁우위를 선점하기 위해서 대학교 푸드 서비스의 가치와 만족도를 증진시키는 방안이 모색되어야 할 것이다.

• 자원환경지질
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• 제19권2호
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• pp.153-163
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• 1986

Paleomagnetic and geological studies of volcanic and sedimentary rocks of Jeju Island have been carried out to determine the position of virtual geomagnetic pole(VGP), and to estimate the geological sequence and their age. As a result of paleomagnetic studies, the reversal polarities are measured in the Sanbangsan trachyte and Hwasun formation, and the normal are the rest. In case of normal polarity, the mean values of declination and inclination are $2.3^{\circ}$ and $48.4^{\circ}$, respectively, and the average value of VGP is $85.4^{\circ}N$ and $79.9^{\circ}W$. The locations of VGP's are coincident with those obtained from world-wide Plio-Pleistocene rocks. The Hwasun formation and Seongsan formation which have been known to be sedimented in the similar time in the 2nd-stage of volcanic eruption, possess reversal and normal polarities, respectively. This fact brings about the result that two formations should be separated in a sense of geological sequence. Consequently, the geological sequence of the 2nd-stage of volcanic eruption is Pyoseonri basalt-Seoguipo hawaiite-Hwasun formation-Seongsan formation-Jungmun hawaiite-Sanbangsan trachyte. Referring to the paleomagnetic studies and the previous and present geological studies, Seoguipo formation corresponds to the Gauss normal epoch, the 2nd-stage of volcanic eruption to Matuyama reversed epoch, and the 3rd-, 4th-, and 5th-stages to Brunhes normal epoch. Therefore, the Seoguipo formation is mostly sedimented during late Pliocene and/or presumably extended to the early Pleistocene. The rocks of the 2nd- to 5th-stage are formed later than this.