• 건축역사연구
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• 제16권5호
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• pp.55-66
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• 2007

Through analysing on construction cases of stupa built in A.D. 7,8th, I have researched about these : constructive methods of inner soil of stupa, spatial compositions, characteristics of structures, arrangements of inner soil and etc. And cases analysed are six ; Mireuksajiseoktap(stone pagoda of Mireuksa Temple site), Gameunsajisamcheumgseoktap(three storied stone pagoda of Gameunsa Temple site), Goseonsajisamcheungseoktap(three storied stone pagoda of Goseonsa Temple site), Wolseong nawolliocheungseoktap(five storied stone pagoda in Nawonri, Wolseong), Guksagokseoktap(three storied stone pagoda in Guksa valley), Giamgokseoktap(three storied stone pagoda in Giam valley). Additionally we researched about inner soil of Sacheonwangsaji tapji(basement of stone stupa site in Sacheonwang Temple site) to speculate on composition of Synthetically, the foundation could be divided as core space and outer space. ; the former as structural function and the latter as ornamental function. And the core area could be divided again as center column space and buffer space. The relationship between core spaces and its formation are as belows; First, according to the area of foundation and scale of stone pagoda, formations of core are differed. As the scale of stone pagoda goes bigger, and the area of foundation goes larger, the structure of stone pagoda comprised by center column type and layered-core which endure upper load independently. On the contrary, as the scale of stone pagoda goes smaller, and the area of foundation goes lesser, the structure of stone pagoda tend to use only center column to endure upper part. Second, spatial composition of core area is comprised as two spaces, one which endure upper load and buffer space which absorb side pressure and upper pressure. The buffer space tend to be used in case of those structures which could not endure side pressure or have lots of joint. In some cases, it was located below the cover stone of foundation and gained upper load. And in case that have not gained pressure from side stone, the buffer space are comprised by smalle stone or roof tile to get structural supplement.

• 한국게임학회 논문지
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• 제7권4호
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• pp.117-123
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• 2007

본 논문은 컴퓨터 바둑에서 돌의 영향력(Stone Influence)과 영향력점(Influence Point) 그리고 영향력 영역(Influence Area)을 제안한다. 돌의 영향력은 놓인 돌과 빈 정점사이의 거리에 따라 정의하며, 영향력점은 돌의 영향력에 대해 임계치를 이용하여 정의한다. 형세평가를 위한 요소로 영향력 영역을 영향력점 덩어리와 코어를 이용하여 정의한다. 저자는 정석 자료를 이용한 실험을 통해서 영향력점의 임계치를 구하였으며, 영향력 영역이 바둑 게임에서 세력으로 성공적으로 적용 가능하였습니다.

• 물과 미래
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• 제30권2호
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• pp.59-61
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• 1997

• 지질공학
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• 제19권1호
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• pp.89-98
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• 2009

암반내의 핵석의 존재는 불안전한 요소로 작용하고 있으며 특히, 절개사면의 경우 노출이 되지 않더라도 핵석이 풍화정도의 차이에 따라 사면의 불연속면 증가 또는 강도 감소가 되며 사면의 낙석이나 붕괴등 사면 거동의 중요한 요소로 작용한다. 연구대상 사면은 20여년전 절개가 완료되어 일부분 사면보강을 완료하였으나 적은 강우에도 잦은 낙석이 발생하여 항구적인 안정대책이 시급한 실정이었다 탄성파탐사와 사면지질조사 견과를 비교 분석하여 핵석의 분포특성 및 규모를 파악할 수 있었다. 또한 주변 암반사면에서 DIPS 프로그램을 이용한 평시투영을 실시하여 주변 풍화토 사면에서의 핵석 분포특성 및 규모 파악에 대하여 검토하였다.

• The Journal of Advanced Prosthodontics
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• 제7권3호
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• pp.199-206
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• 2015

PURPOSE. The present study investigated the influences of various gypsum materials on the precision of fit of CAD/CAM-fabricated prostheses and analyzed their correlation with surface roughness. MATERIALS AND METHODS. The master model of the mandibular right first molar was replicated, and four experimental groups based on two types of Type IV stone (GC Fujirock EP, Die keen) and two types of scannable stone (Aesthetic-Basegold, Everest Rock) were created to include a total of 40 specimens, 10 in each group. The surface roughness of the working models for the respective experimental groups was measured. Once the zirconia cores had been fabricated, the marginal and internal fits were measured with a digital microscope using the silicone replica technique. The mean and standard deviation of the respective points of measurement were computed and analyzed through the one-way ANOVA and Tukey's HSD test. The correlation between surface roughness and the precision of fit of the zirconia core was analyzed using the Pearson correlation analysis (${\alpha}$=.05). RESULTS. The zirconia cores fabricated from the scannable stone working models exhibited a superior precision of fit as compared to those fabricated from the Type IV stone working models. The correlation analysis results showed a clear positive correlation between surface roughness and the precision of fit of zirconia cores in all of the experimental groups (P<.05). CONCLUSION. The results confirmed that the surface roughness of dental working models has a decisive influence on the precision of fit of zirconia cores.

• 농업과학연구
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• 제38권1호
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• pp.101-108
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• 2011

In forest work, working conditions are very hard to improve. The proper distribution of work time and good posture is believed to bring about direct improvements such as accident prevention. On this, this study has analyzed forest workers' posture and their working hours in order to improve their working conditions in stone channel work. Authors has chosen several core elements of stone channel work to focus on, which include stone masonry, excavation of bed, moving stone, directing work, choosing stone, and breaking stone. The ratio of real working time over total working time was shown as 84.6%. As for the time ratio of each elemental work over the real working time, the stone masonry was 60.4%, the directing work was 15.1%, moving stone was 12.1%, choosing stone was 7.1%, breaking stone was 3.3%, and excavation of bed was 2.0%. According to the analytical results provided by OWAS, the ratio of category III (Work posture has a distinctly harmful effect on the musculoskeletal system) has shown that moving stone turned out 65.2%, choosing stone was 61.5%, stone masonry was 46.1%, breaking stone was 14.3%, excavation of bed was 12.5% and directing work was 6.8%. Furthermore, the ratio of category IV (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that excavation of bed turned out 37.5%, breaking stone was 28.6%, stone masonry was 27.3%, choosing stone was 7.7%, moving stone was 6.1% and directing working was 4.5%. These results are expected to be utilized for the improvement with respect to both working methods in the stone channel work and the workers' working posture.

• 한국터널지하공간학회 논문집
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• 제20권6호
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• pp.1039-1048
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• 2018

도심지 터널공사에서는 주변 건물의 안전성을 확보하고, 민원을 최소화할 수 있는 쉴드TBM 공법이 대부분 적용되고 있다. 도심지에는 기존의 택지를 매립조성하거나 개량하는 경우가 많기 때문에 지표에서부터 암반 경계부까지는 불균질한 상태로 이루어지는 경우가 많다. 이와 같이 토사지반, 파쇄정도가 다양한 화강암지반, 핵석층, 암층과 같이 복잡한 지반 조건에서 쉴드TBM으로 터널구조물을 구축하는 경우, 각 지반조건에 따른 쉴드TBM에 나타나는 기계데이터를 분석하여 지반조건에 따른 장비부하의 특징을 비교분석하였다. 그 결과, 설계막장압을 유지하면서 굴진하고, 주기적으로 커터를 점검하여 교체하는 경우, 배토량, 추력, 커터토오크의 경향으로 지반조건의 변화를 예측할 수 있을 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.711-716
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• 2002

When judging the ground by core-logging, depth of coring might be stopped by coming into view of the moderately weathered rock and also considered as bedrock line. However, highly weathered rock may appear again, if coring more, because there are core-stones in the residual soil and highly weathered rock by the effect of hydraulic-thermal differentiation and does the irregular rock weathering or metamorphic rock region. Therefore, there are room for misunderstanding of diagnosing the moderately weathered rock. Even though the irregular ground where the corestones were come out will show clear geotechnical differences between the ground and the gradually weathered bedrock, nowadays, the construction sites do not take into account the characteristic of core-stone region. In conclusion, to study the failure-strength characteristics of soil layers containing core-stones, we made artificial core-stones and varied percentage of corestones, and measured cohesion and friction factors to adjust them to construction sites containing corestones such as slope, tunnel, and underground.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.871-872
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• 2006

Nowadays the market for diamond tools grows rapidly. The present decline in the price of industrial diamond makes it a commoditised product capable of competing with conventional abrasives. In terms of production volume, the largest group of diamond tools comprises the metal-bonded diamond impregnated tools, such as sawblades, wire saws, and core drills for cutting stone and construction materials, and core bits for mining applications. This article provides a compendious coverage of the powder metallurgy (PM) diamond tool-making routes, and identifies the recent trends towards changing the tool design and composition to render it cheaper and more efficient.

• 한국지반신소재학회논문집
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• 제15권4호
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• pp.79-88
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• 2016

경주시에서는 신라시대에 건설된 교량 월정교에 대한 복원사업이 진행되고 있다. 월정교는 760년에 건설되어 고려시대인 1280년에 중수한 기록이 남아있다. 따라서 월정교는 적어도 520년 이상 교량으로 사용되었음을 알 수 있다. 복원사업이 시작되기 전에 월정교는 양측 교대의 일부와 4개의 교각기초 그리고 한 단 내지 두 단의 교각석이 남아있었다. 월정교 복원공사에 앞서, 복원에 사용할 석재의 종류를 결정하기 위하여, 월정교에 사용된 석재유구의 산지를 추정하기 위한 연구를 수행하였다. 월정교석재 유구에 대한 암석학적 조사와 경주시 일원 지질에 대한 현장조사를 실시하였다. 연구결과, 월정교 건설 당시 사용된 석재로는 경주일원의 대표적인 화강암인 남산화강암이 주로 사용되었음을 확인하였다. 특히, 경주 남산의 동측사면 하부에 위치한 통일전과 탑곡 일원에 넓게 분포하고 있는 토르나 핵석이 월정교 축조에 주로 사용되었을 가능성이 높은 것으로 조사되었다.