• 한국재료학회지
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• 제11권9호
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• pp.802-809
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• 2001

Electroplating is an attractive alternative deposition method for copper with the need for a conformal and conductive seed layer In addition, the Cu seed layer should be highly pure so as not to compromise the effective resistivity of the filled copper interconnect structure. This seed layer requires low electrical resistivity, low levels of impurities, smooth interface, good adhesion to the barrier metal and low thickness concurrent with coherence for ensuring void-free fill. The electrical conductivity of the surface plays an important role in formation of initial Cu nuclei, Cu nucleation is much easier on the substrate with higher electrical conductivities. It is also known that the nucleation processes of Cu are very sensitive to surface condition. In this study, copper seed layers deposited by magnetron sputtering onto a tantalum nitride barrier layer were used for electroplating copper in the forward pulsed mode. Prior to electroplating a copper film, the Cu seed layer was cleaned by plasma H$_2$ and $N_2$. In the plasma treatment exposure tome was varied from 1 to 20 min and plasma power from 20 to 140W. Effects of plasma pretreatment to Cu seed/Tantalum nitride (TaN)/borophosphosilicate glass (BPSG) samples on electroplating of copper (Cu) films were investigated.

• 대한공간정보학회지
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• 제14권3호
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• pp.23-30
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• 2006

임야지역은 지역적 특성상 토탈스테이션, RTK-GPS 측량 등의 지상측량 방법으로는 지적재조사 측량에 한계성이 있다. 그렇기 때문에 기존 지적재조사 측량 방법들로 제안되고 있는 방식과는 다른 새로운 방법들이 모색되어야 할 필요성이 있다. 본 연구에서는 임야지역을 효율적으로 재조사할 수 있는 방법으로서 현재 KLIS에서 이용되고 있는 임야도 전산파일의 이용가능성을 제시하고자 하였다. 연구결과 가장 중요한 면적오차는 대체적으로 오차범위 이내의 성과를 보였다. 따라서 위치경계선 조정을 위한 현황 참조 데이터와 KLIS 데이터를 연계하여 이용한다면 향후 지적재조사시에 충분한 활용가능성이 있는 것으로 나타났다.

• 한국항해항만학회지
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• 제28권8호
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• pp.759-766
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• 2004

부산은 서울, 대구 등 내륙도시와는 달리 도시화 과정에 수역의 매립이 포함되어 있어 도시화에 의한 도시기후변화에도 매립의 영향이 있을 것으로 생각된다. 이에 본 연구에서는 한국의 3대 도시인 서울, 부산, 대구의 기후변화요인과 70여 년간의 기상데이터를 비교ㆍ분석하여 부산의 기후변화 특성 및 매립과 기후변화의 관련성에 대해 검토하였다. 그 결과 부산에서 매립이 진행되었다는 점을 제외하면 서울, 부산, 대구의 기후변화 요인에는 큰 차이가 없지만 서울, 대구의 경우는 도시화가 진행됨에 따라 최저기온의 연평균 상승이 현저한 것에 비해 부산은 매립이 진행된 시기에 최고기온의 연평균 상승이 현저함을 밝혔다.

• 대한원격탐사학회지
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• 제20권4호
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• pp.227-234
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• 2004

Tome Delay and Integration (TDI) 기법을 사용하는 고해상도 위성 영상 기기에 있어서 실제 위성 운영시 발생하는 위성 고도의 순간적 변화에 대한 TDI 일치를 연구하였다. 시간에 따라 변하는 순간 고도의 특성을 분석하였고 순간 고도 변화가 TDI 불일치를 초래하여 위성 영상 기기의 성능에 미치는 영향을 분석하였다. TDI 시간 지연을 조절하여 실제 위성 운영에서 순간적으로 발생하는 TDI 불일치를 보정하는 방법을 제안하였고 제안한 방법을 이용할 경우 성능 향상이 가능함을 보였다. 본 연구 결과는 실제 위성 운영에 원활히 적용할 수 있으며 위성 영상 품질 향상에 활용될 수 있다.

• Restorative Dentistry and Endodontics
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• 제27권4호
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• pp.411-420
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• 2002

The aim of this study is to compare the adaptability of thermoplasticized injectable gutta-percha technique to the canal walls in ribbon-shaped canals. Thirty resin models simulated ribbon-shape canals were instrumented to #40 using .06 taper Profile systems. Three groups of each 10 resin models were obturated by the lateral condensation technique(LC) and the two thermoplasticized injectable gutta-percha technique; Ultrafil Endoset+Obtura II(EO) and Ultrafil Firmset(UF), respectively. After resin model were kept at room temperature for 4 days, they were resected horizontally with micro-tome at 1, 2, 3, 4 and 5mm levels from apex. At each levels. image of resected surface were taken using CCD camera under a stereomicroscope at $\times$40 magnification and stored. Ratio of the area of gutta-percha was obtained by calculating area of gutta-percha cone to the total area of canal using digitized image-ana-Iyzing program. The data were collected then analyzed statistically using One-way ANOVA. The results were as follows. 1 At 1mm levels, there was no statistically significant difference in the mean ratio of gutta-percha among the groups. 2. At 2mm level, EO showed the highest mean ratio of gutta-percha (p<0.05) and there was no significant difference between LC and UF. 3. At 3, 4, 5mm levels, EO and UF had significantly greater mean ratio of gutta-percha than LC(p<0.05) and there was no significant difference between EO and UF. In conclusion, the thermoplasticized injectable gutta-percha techniques demonstrated relatively favorable adaptability to canal walls than lateral condensation technique in ribbon-shaped canals except for 1mm level.

• Applied Microscopy
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• 제18권2호
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• pp.177-186
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• 1988

Degeneration of the axon terminals of mamillo-thalamic tract following the electrical coagulation of mamillary body is well known. In this study, the author investigated the ultrastructural alterations of neuropil components, initiated by terminal degenerations. Rats weighing approximately 250 gm were fixed on the stereotaxic instrument(David Kopf Inc., Heavy duty model), and NE 300 active electrode(Rhodes Med. Instr. Inc.) was introduced to the mamillary position of anterior 3.8 mm, lateral 0.5 mm, height 3.8 mm and lateral angle of $23^{\circ}$ according to De Groot's Atlas. Electric current of 20 mA was applied during 1 minute between active and inactive electrodes with Radio Frequency Lesion Generator(RFG 4, Radionics Inc.). Two hours, 2 days, 1 week and 2 weeks following the electrical coagulation of mamillary body, ipsilateral anterior thalamic nucleus was fixed in 1% glutaraldehyde-l% paraformaldehyde and 2% osmium tetroxide, embedded in Araldite mixture, cutted with LKB ultra tome V, stained with uranyl acetate-lead citrate and observed with JEOL 100 CX electron microscope. Observed results were as follows; 1. Degenerated mamillo-thalamic synapses were observed to form asymmetric axospinous or axo-dendritic types. 2. Terminal degeneration was not easily discernible at 2 hours interval after mamillary lesion, but following 2 days the terminal degeneration was apparent. 3. Postsynaptic spines, dendrites and even their cell bodies show edematic changes caused by the degeneration of postsynaptic counterpart. 4. Astrocytic territories, including perivascular processes forming glial limitans of blood-brain barrier, exhibit remarkable expansion. 5. Oligoglia and astroglia are actively engaged in the removal of degenerated elements. 6. Active forms of microglia were increased. 7. The observed results may represent typical ultrastructural alteration pattern within neuropil following the degeneration of certain input axon terminals.

• 한국융합학회논문지
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• 제4권4호
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• pp.13-19
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• 2013

본 논문에서는 고구려 유적 중 유네스코 세계 문화유산으로 등록되어 세계적인 유적으로써 가치를 인정받으며, 세계적으로 많이 알려진 고구려 고분벽화에 대해 Flash로 인터페이스를 제작하고 3D MAX 로 고분을 모델링, 렌더링하고, Premiere로 편집된 애니메이션을 제작하여, 고구려 고분벽화를 가상으로 체험할 수 있는 시스템을 개발하였다. 고구려 고분벽화의 의미, 유적지, 시기 구분 등의 개괄적 설명과 더불어, 고구려인들의 옷, 집, 놀이 등을 소주제로 선정하여 고구려 사람들의 생활상을 상세하게 알려주도록 개발하였다.

• Korea-Australia Rheology Journal
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• 제21권4호
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• pp.225-233
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• 2009

In various attempts to relate the behaviour of highly-elastic liquids in complex flows to their rheometrical behaviour, obvious candidates for study have been the variation of shear viscosity with shear rate, the two normal stress differences $N_1$ and $N_2$, especially $N_1$, and the extensional viscosity $\eta_E$. In this paper, we shall be mainly interested in 'constant-viscosity' Boger fluids, and, accordingly, we shall limit attention to $N_1$ and $\eta_E$. We shall concentrate on two important flows - axisymmetric contraction flow and "splashing" (particularly that which arises when a liquid drop falls onto the tree surface of the same liquid). Modern numerical techniques are employed to provide the theoretical predictions. It is shown that the two obvious manifestations of viscoelastic rheometrical behaviour can sometimes be opposing influences in determining flow characteristics. Specifically, in an axisymmetric contraction flow, high $\eta_E$ can retard the flow, whereas high $N_1$ can have the opposite effect. In the splashing experiment, high $\eta_E$ can certainly reduce the height of the so-called Worthington jet, thus confirming some early suggestions, but, again, other rheometrical influences can also have a role to play and the overall picture may not be as clear as it was once envisaged.

• 건축역사연구
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• 제20권5호
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• pp.81-94
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• 2011

Buddhism that has arisen in India began to build the Stupa to enshrine body and Sari of Buddha as an object of worship. The stupa existed as a tome of holy leaders even before the birth of Buddha, which was called stupa or tupa in the Sanskrit and the Pali, the ancient language of India. The stupa was renamed accordingly in each Buddhism transmitted countries such as Ceylon, Tibet, Nepal, Myanmar, Thailand and China and also reshaped according to their own formative style. But its original meaning and type are kept unchanged. The stupa was established in the 4 holy places including the birth place of Buddha, the place where Buddha found enlightenment, the place where Buddha preached for the first time, and the place where Buddha died. Thus, a pagoda to commemorate holy ancient places is called Chaitya, which became differentiated from the stupa in which Sari is enshrined. The stupa means Nirvana, the eternal body of Buddha, and also a place filled with teaching and preaching of Buddhism. It signifies the symbol of Buddha who escaped from the death and rebirth, to achieve complete extinction, i.e. parinirvana, and to reach ultimate eternal world, rather than simply means death. During the non-statue of th Buddha period, people built the stupa to embody Nirvana of the Buddha, and worshipped the tomb where body of holy saints was enshrined. On the other hand, they also sanctified memorial things such as tools that holy saints used, the Bo tree under which one achieved Nirvana, Dharma cakra that implied words, footprint that carried out mission work, and a way to reach to heaven.

• 한국게임학회 논문지
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• 제16권1호
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• pp.7-22
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• 2016

스마트폰 4천만 시대가 열리며, 모바일 게임 역시 스마트폰의 대중화 속도만큼 빠르게 확산되며 진화하고 있다. 따라서 본 연구에서는 게임시장의 질적 성장을 위해 게임 개발시 그래픽 이미지를 향상하는데 도움이 되고자 작성되었으며, 게임 이용자를 대상으로 게임 장르의 이미지나 느낌을 측정하여, 장르별 색조(tone)의 가이드라인을 제시하고자 하였다. 연구결과, 게임이용자가 각 장르별로 작성한 형용사가 50%이상 일치하는 것으로 나타나 선호하는 색조가 비교적 뚜렷함을 알 수 있었다. 따라서 장르에 대한 색조의 표준화 시도가 가능함을 확인하고, 장르별 3가지 색채의 톤과 밝기를 제안하였다. 본 연구결과를 토대로 스마트폰 게임 개발시 원활한 색채계획에 도움이 되길 기대하며, 성숙기에 접어든 게임시장의 질적 성장을 위하여 보다 다양한 연구가 진행되기를 바라본다.