• Communications of the Korean Mathematical Society
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• v.33 no.2
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• pp.591-604
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• 2018

We consider a family of ribbon 2-knots with trivial Alexander polynomial. We give nonabelian SL(2, C)-representations from the groups of these knots, and then calculate the twisted Alexander polynomials associated to these representations, which allows us to classify this family of knots.

• 제어로봇시스템학회:학술대회논문집
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• 1994.10a
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• pp.494-497
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• 1994

We propose a novel velocity detection method of moving object based on a speckle pattern on the target surface using a self-mixing laser diode (SMLD). By this measurement, it was confirmed that the speckle signal has its waveform independent of the target velocity, and has its averaged frequency directly proportional to the target velocity. So it will be possible to detect the velocity of the target transversely translating against the laser light beam using a compact measuring system.

• Bulletin of the Korean Chemical Society
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• v.34 no.4
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• pp.1247-1249
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• 2013

• Journal of Korean Dental Science
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• v.9 no.2
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• pp.63-68
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• 2016

Pressure root resorption can be observed during the eruption of permanent dentition, especially of the maxillary canines (affecting lateral incisors) and mandibular third molars (affecting mandibular second molars). Since the cause of root resorption of the adjacent affected teeth is evident, treatment simply involves extraction of the impacted tooth. However, there have been few reports on the prognosis of the remaining resorbed tooth, as dentists often choose to extract them when damage due to root resorption is observed. We report a case involving a tooth that was severely resorbed due to pressure from an adjacent impacted tooth. After extraction of the impacted tooth, the remaining tooth retained vital pulp and survived as a functional tooth.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.642-645
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• 2002

This paper introduces a way to realize high-pass, band-stop and all-pass transfer functions using Operational Transconductance Amplifiers (OTAs) and grounded capacitors. The basic circuit configuration is constructed with five OTAs and two grounded capacitors. In the circuit with the proportional block, it is shown that the circuit parameters can be independently set and electronically tuned by the transconductance gains. Although the circuit configuration has been Down, it seems that the feature for realizing the high-pass, the band-pass and the all-pass transfer functions makes the structure more attractive and useful. An example is given together with simulated results by PSPICE.

• Polymer Science and Technology
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• v.26 no.4
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• pp.305-312
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• 2015

• 제어로봇시스템학회:학술대회논문집
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• 1991.10b
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• pp.1966-1970
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• 1991

The self-mixing type semiconductor laser Doppler velocimeter(SM-LDV) is applied to measure two simultaneously moving targets with different velocities in the same direction as a prototype target for multiscatterers. The measured beat waveform is found to be a composite wave of each beat waveform measured fran each of only moving target. In the composite waveform, each one-cycle wave has a feature of the sawtooth wave. This fact shows a possibility to discriminate the flow direction of fluid containing multiscatterers with distributed velocities by cooperating an improved version of the direction discrimination circuit already devised by the authors.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.211-214
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• 2014

본 논문에서는 정보통신미디어계열 학과로서 서울 소재 고등학교 2 학년 학생들을 대상으로 고교-대학 연계 프로그램을 진행한 경험을 분석하였다. 1 차와 2 차로 나누어 진행하였고, 1 차에서는 이론특강과 실습을 통해 최신이론을 학습하고, 기초적인 실습을 하였으며, 2 차에서는 심화실습을 통해 학생들의 문제해결능력과 발전가능성을 가늠해보았다. 1 차에서 학생들은 이론과 실습을 흥미로워 하였으나 난이도에 대한 체감이 달랐고, 2 차에서는 협업하여 결과물을 도출하였고 전체적인 만족도가 높게 나타났다. 결과적으로 직접 하는 실습을 선호하였고, 진로와 전공 탐색에 도움이 되었다고 평가하였으며, 관련 분야로의 학습 의욕이 있음을 나타냈다. 본 경험을 통해 학생들이 이러한 연계프로그램에서 만족하는 것과 원하는 것이 무엇인지를 분석하여 지속적이고 체계적인 고교-대학 연계 프로그램 개발에 도움이 되고자 하는데 의의가 있다.

• Journal of Applied Biological Chemistry
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• v.51 no.1
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• pp.17-19
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• 2008

Isoflavanone has been synthesized from the reduction of isoflavone in nearly quantitative yield. Isoflavone with seven equivalents of ammonium formate in the presence of Pd/C in ethanol under $N_2$ atmosphere exclusively produced the two-electron reduced product in two hours. It was characterized by various spectroscopic methods, including UV-VIS, EI-MS, $^1H$-NMR, $^{13}C$-NMR and $^1H$, $^1H$-COSY. The racemic mixture was separated by Sumi-Chiral column chromatography and the absolute configurations of the enantiomers were characterized by circular dichroism spectroscopy.

• Journal of Game and Entertainment
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• v.2 no.1
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• pp.27-34
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• 2006

Computer-assisted animation production tools have an important role in animation production industries. They could reduce the production cost and time, but they rarely copy artistic characteristics of an animators. In this paper, a new computer-assisted line pattern drawing system is proposed. The system automatically copies artistic characteristics of an animator and applies them to computer-generated animations. The artistic characteristics are captured from key frames drawn by an animator. The result shows that the presented approach can copy artistic characteristics from key frames well and reduce time and cost for producing artistic animations.