• 디지털융복합연구
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• 제11권2호
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• pp.127-135
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• 2013

IT 프로젝트가 성공적으로 실현되기 위해서 개별 컨설턴트의 역량은 매우 중요하다. 특히 IT 프로젝트 수행 동안 발생하는 다양한 문제를 해결하기 위해서는 학습이 필요하며 이 학습은 실행에 의한 학습, 타인을 통한 학습, 투자에 의한 학습으로 구분된다. 본 연구의 목적은 이러한 세 가지 학습프로세스가 컨설턴트의 의사결정 성과에 미치는 영향을 살펴보는 것이다. 연구모형을 수립하기에 앞서 팀장급 이상 컨설턴트와 3회 인터뷰를 수행하였다. 본 과정을 통해 연구모형과 설문문항에 대한 타당성 검증을 수행하였다. 100명 이상의 현직 컨설턴트들의 설문에 참여하였다. 연구결과 타인을 통한 학습은 의사결정에 아무런 영향도 미치지 않는 것으로 나타났다.

• 대한간호학회지
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• 제30권5호
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• pp.1121-1132
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• 2000

Service quality is, unlike goods quality, an abstract and elusive term. However, quality is very important to marketers and consumers in that it has many strategic benefits in contributing to profitability of marketing activities and consumers' problem-solving activities. The main purpose of this study is 1) to explore the differences of perception between consumers and providers about nursing service quality. 2) to identify the useful tool between two tools measuring nursing service quality. To achieve these purposes of the study, the questionnaire was developed and distributed to 210 nurses who worked at seven subjected hospitals in Seoul. Also, 280 people who had a direct experience with the subjected hospital nursing services at the time of screening were involved. They were randomly selected at the seven subjected hospitals during August to September of 1998. Among them, 165 responses from nurses and 229 responses from others resulted in worthy finds. The measurement instrument for a nursing services quality evaluation was modified from the SERVQUAL model originated from Parasuraman, Zeithaml, and Berry (1988). The reliability coefficient of the scale was calculated and showed high degree of internal consistency (Cronbachs' Alpha = .9353). For data analysis, SPSS/PC was used for descriptive statistics, t-test, ANOVA and regression analysis. The results were as follows : 1) In the perception about nursing services quality, there were gap between consumers and providers. Especially the critical attributes in point of perception nursing services quality, naming satisfy, hygiene and performance factors, are very different contents. 2) In the comparison analysis of the usefulness tools it was turned out that SEVPERF model is more appropriate than SERVQUAL model. And in the analysis to identify the construct validity of the tool, it is turned out that the relationship between the constructing factors of the tool and the general satisfaction is significant.

• Steel and Composite Structures
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• 제26권2호
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• pp.197-211
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• 2018

The study presents the earthquake performance of the Bosphorus Bridge under multi-point earthquake excitation considering the spatially varying site-specific earthquake motions. The elaborate FE model of the bridge is firstly established depending on the new considerations of the used FEM software specifications, such as cable-sag effect, rigid link and gap elements. The modal analysis showed that singular modes of the deck and the tower were relatively effective in the dynamic behavior of the bridge due to higher total mass participation mass ratio of 80%. The parameters and requirements to be considered in simulation process are determined to generate the spatially varying site-specific ground motions. Total number of twelve simulated ground motions are defined for the multi-support earthquake analysis (Mp-sup). In order to easily implement multi-point earthquake excitation to the bridge, the practice-oriented procedure is summarized. The results demonstrated that the Mp-sup led to high increase in sectional forces of the critical components of the bridge, especially tower base section and tensile force of the main and back stay cables. A close relationship between the dynamic response and the behavior of the bridge under the Mp-sup was also obtained. Consequently, the outcomes from this study underscored the importance of the utilization of the multi-point earthquake analysis and the necessity of considering specifically generated earthquake motions for suspension bridges.

• 농촌지도와개발
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• 제22권2호
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• pp.191-203
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• 2015

The purposes of this study are to explain the background and significance of the 'Farmers' upstairs'(農民上樓) phenomenon which has been currently promoted as part of the "New Socialist Countryside Construction" in contemporary China, and its positive and negative aspects, and analyze the limitations of 'Farmers' upstairs'phenomenon. 'Farmers' upstairs'means the building of concentrated farmhouses by means of reconstruction of scattered farmhouses here and there, simultaneously by installing cultural, social welfare, and environmental facilities where rural farmer also could enjoy the convenience of urban living. It brings, however, the positive effects such as the improvement of living conditions of rural farmers, the simultaneously expanding of urban construction land and agricultural land, and the new influx of population from urban areas, whiles the negative effectives such as the forced demolition of farmhouses by governments or real estate developers with very lower compensation costs for the demolition of farmhouses, the gap from the standard of living, and above all, the inconvenience caused by the living in a multi-stories building in the rural villages. As a result, it is pointed out that the ongoing 'Farmers' upstairs', promoted as a kind of rural movement beyond a phenomenon, has similarities with the Rural Cooperative Movement(農村合作化運動) of Mao Zedong era(1953-61), namely the People's Commune Movement(人民公社運動) finally failed.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.191.2-191.2
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• 2015

Details of carrier dynamics in self-assembled quantum dots (QDs) with a particular attention to nonradiative processes are not only interesting for fundamental physics, but it is also relevant to performance of optoelectronic devices and the exploitation of nanocrystals in practical applications. In general, the possible processes in such systems can be considered as radiative relaxation, carrier transfer between dots of different dimensions, Auger nonradiactive scattering, thermal escape from the dot, and trapping in surface and/or defects states. Authors of recent studies have proposed a mechanism for the carrier dynamics of time-resolved photoluminescence CdTe (a type II-VI QDs) systems. This mechanism involves the activation of phonons mediated by electron-phonon interactions. Confinement of both electrons and holes is strongly dependent on the thermal escape process, which can include multi-longitudinal optical phonon absorption resulting from carriers trapped in QD surface defects. Furthermore, the discrete quantized energies in the QD density of states (1S, 2S, 1P, etc.) arise mainly from ${\delta}$-functions in the QDs, which are related to different orbitals. Multiple discrete transitions between well separated energy states may play a critical role in carrier dynamics at low temperature when the thermal escape processes is not available. The decay time in QD structures slightly increases with temperature due to the redistribution of the QDs into discrete levels. Among II-VI QDs, wide-gap CdZnTe QD structures characterized by large excitonic binding energies are of great interest because of their potential use in optoelectronic devices that operate in the green spectral range. Furthermore, CdZnTe layers have emerged as excellent candidates for possible fabrication of ferroelectric non-volatile flash memory. In this study, we investigated the optical properties of CdZnTe/ZnTe QDs on Si substrate grown using molecular beam epitaxy. Time-resolved and temperature-dependent PL measurements were carried out in order to investigate the temperature-dependent carrier dynamics and the activation energy of CdZnTe/ZnTe QDs on Si substrate.

• 한국정밀공학회지
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• 제26권5호
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• pp.150-156
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• 2009

The removal of tiny particles adhered to surfaces is one of the crucial prerequisite for a further increase in IC fabrication, large area displays and for the process in nanotechnology. Various cleaning techniques (wet chemical cleaning, scrubbing, pressurized jets and ultrasonic processes) currently used to clean critical surfaces are limited to removal of micrometer-sized particles. Therefore the removal of sub-micron sized particles from silicon wafers is of great interest. For this purpose various cleaning methods are currently under investigation. In this paper, we report on experiments on the cleaning effect of 100nm sized fluorescence particles on silicon wafer using the plasma shockwave occurred by femtosecond laser. The plasma shockwave is main effect of femtosecond laser cleaning to remove particles. The removal efficiency was dependent on the gap distance between laser focus and surface but in some case surface was damaged by excessive laser intensity. These experiments demonstrate the feasibility of femtosecond laser cleaning using 100nm size fluorescence particles on wafer.

• 터널과지하공간
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• 제15권1호
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• pp.39-46
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• 2005

터널 단층대에서 수평시추로 조사한 막장전방의 암반 상태를 공학적 암반분류법인 RMR값으로 평가하였고 이를 터널 굴착 후 막장을 관찰하여 결정한 RMR값과 비교 분석하였다. 수평시추로 예측한 RMR값은 비교적 정확하여 터널 굴진 후 막장을 관찰하여 구한 RMR값과 큰 차이가 없었다. 그러나 일부 구간에서는 수평시추와 막장관찰로 구한 RMR값의 차이가 약 50까지 발생하였고 이를 RMR 평가항목으로 분석한 결과 불연속면의 상태에 대한 평점에서 24의 차이가 나타났고 암질지수와 단축압축강도 평점에서 각각 15와 13의 차이로 나타났다. 두 방법에서 평가한 RMR값의 차이를 줄이기 위해서는 터널 내 수평시추공의 위치를 터널의 안정성에 가장 큰 영향을 줄 수 있는 곳으로 선정하고 불연속면의 상태에 대한 평가는 불연속면의 연속성, 분리 틈, 풍화도 등 5개의 소항목 각각에 대해 5단계로 구분한 세부평점을 적용하여야 할 것이다.

• 한국진공학회지
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• 제20권5호
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• pp.322-326
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• 2011

상부 전극에 RF power 가 직접 인가되는 capacitively coupled plasma source를 이용한 oxide layer etching 공정은 현재 반도체 제조 공정에서 매우 유용하게 사용되고 있는 방식이다. 그러나 디바이스의 사이즈가 점점 작아지면서 공정을 진행하기 위한 RF power도 커지고, plasma ignition 되는 electrode 사이의 간격도 점점 좁아지는 기술적 변화가 이루어지고 있다. 이러한 H/W의 변화에 따라 예상치 못한 문제들로 공정을 적용하는데 많은 문제점이 발생하고 있는데, 공정 진행 시에 plasma의 영향으로 인한 electrode의 온도 변화도 그 중 하나이다. 이러한 온도 변화로 인해 wafer to wafer의 공정 진행 결과가 서로 다르게 나타나게 하는 문제가 야기되고 있다. 아래의 내용에서는 상부 electrode의 온도 변화에 따른 etch 특성을 연구하고, 이를 개선할 수 있는 방법에 대해 논하고자 한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.226-226
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• 2013

Si is a dominant solar material, which is the second most abundant element in the earth giving a benefit in the aspect in cost with low toxicity. However, the inherent limit of Si has an indirect band gap of 1.1 eV resulting in the limited optical absorption. Therefore, a critical issue has been raised to increase the utilization of the incident light into the Si absorber. The enhancement of light absorption is a crucial to improve the performances and thus relieves the cost burden of Si photovoltaics. For the optical aspect, an efficient design of a front surface, where the incident light comes in, has been intensively investigated to improve the performance of photon absorption. Lambertian light trapping can be attained when the light active surface is ideally rough to increase the optical length by about 50 compared to a planar substrate. This suggests that an efficient design may reduce thickness of the Si absorber from the conventional 100~300 ${\mu}m$ to less than 3 ${\mu}m$. Theoretically, a hole-array structure satisfies an equivalent efficiency of c-Si with only one-twelfth mass and one-sixth thickness. Various approaches have been applied to improve the incident light utilization in a Si absorber using textured structures, periodic gratings, photonic crystals, and nanorod arrays. We have designed hole and pillar structured Si absorbers. Four-different Si absorbers have been simultaneously fabricated on an identical Si wafer with hole arrays or pillar arrays at a fixed depth of 2 ${\mu}m$. We have found that the significant enhanced solar cell performances both for the hole arrayed and pillar arrayed Si absorbers compared to that of a planar Si wafer resulting from the effective improvement in the quantum efficiencies.

• Journal of Computational Design and Engineering
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• 제3권1호
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• pp.37-52
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• 2016

To injection mould polymers, designing mould is a key task involving several critical decisions with direct implications to yield quality, productivity and frugality. One prominent decision among them is specifying sprue-bush conduit expansion as it significantly influences overall injection moulding; abstruseness anguish in its design criteria deceives direct determination. Intuitively designers decide it wisely and then exasperate by optimising or manipulating processing parameters. To overwhelm that anomaly this research aims at proposing an ideal design criteria holistically for all polymeric materials also tend as a functional assessment metric towards perfection i.e., criteria to specify sprue conduit size before mould development. Accordingly, a priori analytical criterion was deduced quantitatively as expansion ratio from ubiquitous empirical relationships specifically a.k.a an exclusive expansion angle imperatively configured for injectant properties. Its computational intelligence advantage was leveraged to augment functionality of perfectly injecting into an impression gap, while synchronising both injector capacity and desired moulding features. For comprehensiveness, it was continuously sensitised over infinite scale as an explicit factor dependent on in-situ spatio-temporal injectant state perplexity with discrete slope and altitude for each polymeric character. In which congregant ranges of apparent viscosity and shear thinning index were conceived to characteristically assort most thermoplastics. Thereon results accorded aggressive conduit expansion widening for viscous incrust, while a very aggressive narrowing for shear thinning encrust; among them apparent viscosity had relative dominance. This important rationale would certainly form a priori design basis as well diagnose filling issues causing several defects. Like this the proposed generic design criteria, being simple would immensely benefit mould designers besides serve as an inexpensive preventive cliché to moulders. Its adaption ease to practice manifests a hope of injection moulding extremely alluring polymers. Therefore, we concluded that appreciating injectant's polymeric character to design exclusive sprue bush offers a definite a priori advantage.