• Korean Journal of Food Science and Technology
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• v.29 no.6
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• pp.1304-1308
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• 1997

In the course of studies for anti-plaque agents, novel procyanidin structure isolated from Artocarpus heterophyllus folium was established by thiolysis and spectroscopic analysis. The chemical structure was identified for $(-)-epiafzelecin-(4{\beta}{\rightarrow}8)-afzelecin-(4{\alpha}-8)-catechin$ containing the trimeric flavan-3-ols and molecular weight was 833[M-H] by FAB-MS negative ion method. The inhibitory effect on the glucosyltransferase activity was investigated, novel compound showed complete inhibition at 1.0 mM and inhibited on the glucosyltransferase noncompetitively.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.239-242
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• 2020

본 논문에서는 Novel Engineering(NE) 기반 메이커 교육이 우리나라 초등 교육과정의 성취기준을 달성하기에 적합한 방법인지를 분석하여 확인한다. NE는 공학과 문해력의 융합교육으로 책 속에서 문제 상황을 찾아 이를 해결하기 위해 공학적 산출물을 만드는 문제 해결 교육 방법이다. 국내에서는 초등학생을 대상으로 NE의 적용에 대한 연구가 점점 늘고 있으나, 교육과정 적합성과 관련된 연구는 매우 부족하다. 본 논문에서는 2015 개정 실과 및 국어 교육과정의 분석을 통하여 NE와 초등 교육과정 간의 연관성을 확인하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.121-124
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• 2020

본 논문에서는 다양한 전공의 예비 교사를 위한 Novel Engineering(NE) 기반의 메이커 교육 강의를 개발하였다. NE는 선정하는 도서의 내용에 따라 다양한 교과목에서 활용이 가능하다는 장점이 있는 교수·학습방법으로 다양한 전공을 가진 예비교사들이 자신의 전공에 메이커 교육을 접목하기에 용이하다. 강의의 개발은 교수설계모형인 ADDIE 모형의 절차에 따라 이루어졌으며 메이커 교육 이론→기술 습득→메이킹 프로젝트 1→메이킹 프로젝트 2의 단계로 구성된 강의를 개발하였다. 개발된 강의를 다양한 전공의 예비교사 20명에게 적용한 결과 높은 수준의 수업 만족도를 보였다.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2002.10b
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• pp.365-366
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• 2002

The sliding wear behavior of ultra high molecular weight polyethylene (UHMWPE) was examined on a novel low temperature degradation-free zirconia/alumina composite material and conventional alumina and zirconia ceramics used for femoral head in total hip joint replacement. The wear of UHMWPE pins against these ceramic disks was evaluated by performing linear reciprocal sliding and repeat pass rotational sliding tests for one million cycles in bovine serum. The weight loss of polyethylene against the novel low temperature degradation-free zirconia/alumina composite disks was much less than those against conventional ceramics for all tests. The mean weight loss of the polyethylene pins was more io the linear reciprocal sliding test than in the repeal pass rotational sliding lest for all kinds of disk materials. Neither the coherent transfer film nor the surface damage was observed on the surface of the novel zirconia/alumina composite disks during the test. The observed r,'stilts indicated that the wear of the polyethylene was closely related to contacting materials and kinematic motions. In conclusion, the novel zirconia/alumina composite leads the least wear of polyethylene among the tested ceramics and demonstrates the potential as lhe alternative materials for femoral head in total hip joint replacement.

• Proceedings of the Korean Society for Bioinformatics Conference
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• 2005.09a
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• pp.41-44
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• 2005

Cytokines play a crucial role in the immune and inflammatory responses. But because of the high evolutionary rate of these proteins, the similarity between different members of their family is very low, which makes the identification of novel members of cytokines very difficult. According to this point, a new bioinformatic strategy to identify novel cytokine of the short-chain and long-chain 4${\alpha}$ helix cytokine using hidden markov model (HMM) is proposed in the paper. As a result, two motifs were created on the two train data sets, which were used to search three different databases. In order to improve the result, a strict criterion is established to filter the novel cytokines in the subject proteins. Finally, according to their E-value, scores and the criterion, four subject proteins are predicted to be possible novel cytokines for each family respectively.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.4
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• pp.238-243
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• 2006

This paper presents novel ignition method for automotive 35W metal halide discharge lamp electronic ballast. At this study, the novel method of ignition is developed to reduce costs and size of the ballast. By use of the novel method, the voltage needed in ignition is decreased, which result in use of the lower voltage rating power devices compared with conventional method and product compactness was achieved by deleting a circuit generating negative voltage needed in ignition at an conventional circuit. In terms of luminosity, color rendering, light efficiency(lm/W) and lifespan, the metal halide lamp is superior to, but unlike halogen lamp, it have more complicated transient characteristics to reach its steady state than the conventional halogen lamp. Therefore, in this paper, the electronic ballast was designed such that the metal halide lamp could be optimized for the automotive, by applying a method of microcontroller-based digital control. The results of the proposed system is verified through various experiment results.

• Journal of Korean Society for Atmospheric Environment
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• v.16 no.6
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• pp.675-684
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• 2000

A novel dry and wet deposition collector, which can overcome the several problems such as water evaporation cartridge cracks and high costs founded in the previous collector systems, has been constructed. ENVI-18 SPE adsorption cartridge has been used to measure atmospheric deposition of polycylic aromatic hydrocarbons (PAHs). A surrogate surface, consisted of water and methanol, was filled in the dry deposition funnel to simulate dry deposition onto water surface. A water supply system in order to compensat evaporation of the surrogate surface was used and it was consisted of a piston pump, a tubing pump, a overflow tube and a chamber system. A novel water vaporizing system to supply water onto the wet SPE cartridge system with a constant flow rate was developed. The novel water vaporizing system, consisted of a vacuum pump, a water supply reserviour and tube and a mini space heater, could prevent the PAHs adsorption cartridge cracks occurred in the previous collector and effectively adsorb PAHs. The novel dry and wet deposition collector showed a good adsorption, desorption, and recovery rates of PAHs. By reducing the number of pumps used and employing polypyopylene (PP) instead of teflon as a material of collection funnel, the total construction costs were much reduced as compared with the previous dry and wet deposition collectors.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.347-350
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• 2000

This paper deals with the novel DPWM(discontinuous PWM) for 3-level inverter. Although DPWM methods generate higher harmonics than SVPWM they are of special interest because of their lower switching losses. And in the high modulation region the harmonic characteristics of DPWM is superior to the that of CPWM. However when DPWM applies to the 3-level inverter there is the problem that the output state is varied suddenly in the low modulation region($\textrm{m}_{I}$=0~0.5) The novel DPWM that this problem improves will be introduced.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.87-88
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• 2014

The paper presents a novel phase locked loop(PLL) control method for robust three-phase thyristor dual converters under sag, notch, and phase loss conditions. This method is applied to three line to line voltages of grid to derive three phase angle errors from three separated single-phase PLLs. They can substitute for abnormal phase to guarantee the synchronization in the various grid fault conditions. The performance of novel PLL with moving average method is verified through simulations.

• 한국전산유체공학회:학술대회논문집
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• 2003.10a
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• pp.19-20
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• 2003

Brownian-dynamics simulation on highly charged colloidal suspensions is performed by employing Tokuyama effective force recently proposed. The radial distribution function suggests that there exist three novel phases, a gas phase, a liquid droplet phase, and a face-centered cubic (FCC) crystal droplet phase, depending on the minimum values of that potential. The dynamics of droplet growth is also investigated both in liquid droplet phase and in crystal droplet phase. Thus, different types of characteristic growth stages are found.