• Restorative Dentistry and Endodontics
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• 제35권2호
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• pp.65-68
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• 2010

복합레진의 개발 및 환자의 심미적 욕구로 인해 기존의 아말감을 복합레진 수복이 빠른 속도로 대체하고 있다. 하지만 복합레진의 경우 술식의 어려움, 중합수축으로 인한 응력의 발생, 재료의 파절, 이차우식등의 문제를 가지고 있으며 아직까지 복합레진 수복을 위해서는 치과용 접착제의 사용이 필수적이다. 이에 본 글에서는 현재 복합레진이 가지고 있는 문제점을 극복하기 위해 복합레진 수복의 가장 많은 실패 원인으로 알려진 이차우식을 억제할 수 있는 재광화 물질을 방출할 수 있는 복합레진의 개발이 어디까지 이루어지고 있는지 살펴보고 앞으로의 임상적용 가능성에 대해 생각해보고자 한다.

• 정보처리학회논문지C
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• 제10C권4호
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• pp.493-500
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• 2003

본고에서는 에이전트의 제어 및 관리를 위한 인터페이스 표준과, 각 인터페이스에 필요한 메시지를 구현하였다. 에이전트 인터페이스는 에이전트, 에이전트를 생성하고 활동 토대를 제공하는 에이전트 시스템, 서비스를 요구하는 클라이언트, 서비스를 중재하는 에이전트 매스터, 망내의 에이전트 관리 기능을 수행하는 에이전트 관리자 사이의 메시지 교환으로 정의된다. 이러한 인터페이스 표준은 OMG의 MAF와 FIPA의 에이전트 표준을 반영하여 만들어 졌으며, 논문에서 정의한 인터페이스와 메시지를 이용한 응용을 구현하여 실험하였다 실험 망은 컨텐츠를 분배해주는 망을 에이전트로 구현한 망으로서, 에이전트 인터페이스를 통해 이를 제어하고 관리하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.917-918
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• 2007

The former earth leakage breaker is operating by total leakage current which is the vector-sum of resistive leakage current and capacitive leakage current. However, the electric disaster like the electric shock and fire is caused mainly by resistive leakage current. Therefore, the earth leakage breaker is ideal when it is operating by resistive leakage current. In this paper, the theory for finding the component of resistive leakage current from total leakage current is suggested and it is embodied to actual circuit. The resistive leakage current can be found by integrating the total leakage current during half cycle of line voltage. Thus, we can simply find resistive leakage current by using OP-AMP integrators, and we can confirm that the resistive leakage current is computed exactly from total leakage current obtained by resistive leakage current and capacitive leakage current. The results that the earth leakage breaker is operating within regular interrupt time are verified when the former earth leakage breaker's controller circuit is replaced by the proposed controller circuit.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.308-310
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• 2005

In recent years, the research and development for the photovoltaic(PV) energy system are making rapidly progress around the world and specially this country, too due the deregulation law for the renewable energy system seems to be born sooner or later. In PV generation system, the partially shaded PV array is the one of the worst case which reduces the efficiency of the total PV generation system. The partial shaded condition is the result of shadowing by cloud and dust building of on the surface of the panel. Some structural elements, such as antennas, booms etc. is also the reason of the shadowing. Even if only a small part of PV is shaded, the overall generation power of PV is significantly decreased. Therefore, several researchers who are focusing on the PV generation system take a time for the research related with the shadowing problem of PV array. In this paper, authors have developed the method which users can achieved the modeling of partially shaded PV array with. With several papers authors have already announced the availability of the EMTDC/PSCAD PV panel model component. This research result is the developed version of the previous papers.

• 응용통계연구
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• 제28권1호
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• pp.49-60
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• 2015

군생태학에서 종, 장소 그리고 환경변수의 관계를 시각적으로 보기 위해 대응분석, 정준대응분석 등 다양한 서열화방법들을 사용한다. Ter Braak (1986), Jackson 등 (1991), Parmer (1993) 등은 고유값 및 거리그래프를 이용하여 서열화방법들을 비교하고 있는데, 이 방법들은 조사된 데이터에 근거하고 있기 때문에, 모집단과 행렬도의 관계를 보여주지는 못한다. 따라서, 본 논문에서는 행렬도에 모집단 정보의 표현정도를 측정하는 방법을 소개하고, 이를 활용하여 서열화방법들을 객관적으로 비교하였다. 비교결과, 정준대응분석은 대응분석과 유사한 정분류율을 유지하면서도 환경정보를 이차원 공간에 표현할 수 있는 장점을 지닌 분석임을 확인하였다.

• Mycobiology
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• 제44권4호
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• pp.338-342
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• 2016

The culture filtrate of Lentinula edodes shows potent antimicrobial activity against the plant pathogenic bacteria Ralstonia solanacearum. Bioassay-guided fractionation was conducted using Diaion HP-20 column chromatography, and the insoluble active compound was not adsorbed on the resin. Further fractionation by high-performance liquid chromatography (HPLC) suggested that the active compounds were organic acids. Nine organic acids were detected in the culture filtrate of L. edodes; oxalic acid was the major component and exhibited antibacterial activity against nine different phytopathogenic bacteria. Quantitative analysis by HPLC revealed that the content of oxalic acid was higher in the water extract from spent mushroom substrate than in liquid culture. This suggests that the water extract of spent L. edodes substrate is an eco-friendly control agent for plant diseases.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.94-98
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• 2013

Transfer Path Analysis (TPA) is commonly used, by car makers and parts suppliers, analysis process to root the cause of NVH problems. In general, TPA is an analyzing technique to find the contributing factors of noise/vibration problems, and their transfer path in vehicle. However, not only TPA is used to analyze the source of NVH problems but also is used to predict NVH performance prior to the proto vehicle, or to set the development target for next new vehicle. Automotive parts manufacturing companies have to set NVH performance target when developing new systems just as car makers have NVH target set for new vehicle. Nevertheless, most of components are currently being developed based on subjective evaluation without an objective target. To judge the suitability of using TPA to set NVH target of electric parking brake, this research analyzed the transfer path by setting them in two points of view; Chassis Module and Electric Parking Brake, and comparing the measured value and calculated value. From this result, NVH target of electric parking brake will be approached in level of vehicle, system and component.

• 한국정밀공학회지
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• 제32권11호
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• pp.929-935
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• 2015

The long neck flange is used to connect piping arrangements where the lap joint is applied. Generally, the component can be manufactured by welding, but this method is both time and cost intensive. Embrittlement at the heat affected zones was also considered. A spinning method developed to improve the manufacturing process and solve the problems of welding. The flange area of the long neck flange can be formed by changing the direction of the metal flow, from axial to radial, while maintaining pressure by using an outer mold and a lap roller. A modified process was additionally developed using a round roller rather than the outer mold. In this modification, the round roller can form the shape of all sizes of long neck flange. Using these flexible methodologies, the cost to prepare outer molds and the time to install and remove the molds can be significantly reduced.

• Molecules and Cells
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• 제26권4호
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• pp.329-337
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• 2008

Src-family kinases are critically involved in the control of cytoskeleton organization and in the generation of integrin-dependent signaling responses, inducing tyrosine phosphorylation of many signaling and cytoskeletal proteins. Activity of the Src family of tyrosine kinases is tightly controlled by inhibitory phosphorylation of a carboxy-terminal tyrosine residue, inducing an inactive conformation through binding with its SH2 domain. Dephosphorylation of C-ter tyrosine, as well as its deletion of substitution with phenylalanine in oncogenic Src kinases, leads to autophosphorylation at a tyrosine in the activation loop, thereby leading to enhanced Src activity. Beside this phophorylation/dephosphorylation circuitry, cysteine oxidation has been recently reported as a further mechanism of enzyme activation. Mounting evidence describes Src activation via its redox regulation as a key outcome in several circumstances, including growth factor and cytokines signaling, integrin-mediated cell adhesion and motility, membrane receptor cross-talk as well in cell transformation and tumor progression. Among the plethora of data involving Src kinase in physiological and pathophysiological processes, this review will give emphasis to the redox component of the regulation of this master kinase.

• 대한기계학회논문집B
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• 제26권2호
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• pp.362-373
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• 2002

A stereoscopic PIV (SPIV) measurement system based on the translation configuration was developed and applied to the flow behind a forward-swept axial-fan. Measurement of three orthogonal velocity components is essential for flow analysis of three-dimensional flows such as flow around a fan or propeller. In this study, the translation configuration was adopted to calculate the out-of-plane velocity component from 2-D PIV data obtained from two CCD cameras. The error caused by the out-of-plane motion was estimated by direct comparison of the 2-D PIV and 3-D SPIV results that measured from the particle images captured simultaneously. The comparison shows that the error ratio is relatively high in the region of higher out-of-plane motion near the axial fan blade. The turbulence intensity measured by the 2-D PIV method is bigger by about 5.8% in maximum compared with that of the 3-D SPIV method. The phase-averaged velocity field results show that the wake behind an axial fan has a periodic flow structure with respect to the blade phase and the characteristic flow structure is shifted downstream in the next phase.