• 농촌계획
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• 제12권2호
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• pp.27-35
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• 2006

The purpose of this paper is to estimate the economic value of Multi-functionality Roles including landscape and so on, which the stone fences in Jejudo possess, using Dichotomous Choice Contingent Valuation Method(DC-CVM). The stone wall is life cultural heritance of Cheju islanders. It has functions like Development of Favorable Landscapes, Maintenance of Cultural Heritage, and Recreation/Relaxation. Expectation from Cheju visitors shows that the existence and inheritance value of the stone wall is higher then we expected. According to the research that we had done from the people that had agreed to contribute the stone wall, the result was that the public commercial value of Cheju tradition stone will increase every yew(2006: 367 billion won, 2011: 437.1 billion won). Therefore, preserving the stone wall that has Multi-functional Roles and values can lead to huge economic value in the future. But farmhouses in the stone wall conservation area are being supported 6 million won every year. This is only 10% of the income that farmhouse ems per year. Thus, stone wall preservation policy and plan that can raise green-tour commercial value of Cheju Island of long-term inside measurement will have to be propelled continuously.

• Structural Engineering and Mechanics
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• 제58권2호
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• pp.243-257
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• 2016

The aim of this study is to investigate the seismic resistance of dry stone arches under in-plane seismic loading. For that purpose, several numerical analyses were performed using the combined finite-discrete element method (FDEM). Twelve types of arches with different ratios of a rise at the mid-span to the span, different thicknesses of stone blocks and different numbers of stone blocks in the arch were subjected to an incremental dynamic analysis based on excitation from three real horizontal and vertical ground motions. The minimum value of the failure peak ground acceleration that caused the collapse of the arch was adopted as a measure of the seismic resistance. In this study, the collapse mechanisms of each type of stone arch, as well as the influence of the geometry of stone blocks and stone arches on the seismic resistance of structures were observed. The conclusions obtained on the basis of the performed numerical analyses can be used as guidelines for the design of dry stone arches.

• 대한치과보철학회지
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• 제9권1호
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• pp.23-27
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• 1969

The purpose of this studies is to determine the surface hardness of dental stone and to investigate the methods which increase the surface hardness of dental stone using the dissolved solution of various synthetic resin, the obtained results of hardness value calculated Rockwell Hardness Number by means of Rockwell Hardness Tester. 1) In this experiment, 10% polystyrene dissolved in 100cc amylacetate is excellent solution which provides the surface hardness of dental stone after setting of specimen, and there is no effective way that stone specimen is immersed into polystyrene in amylacetate, polystyrene in benzene and polystyrene in butylacetate above 1 hour. 2) When the stone specimen is immersed into acrylic resin in benzene and melamin resin in amylacetate at least 1 hour to 3 hours, the hardening effect of stone surface is valuable. 3) The stone specimen immersing into urea resin in butylacetate, the surface hardness of the stone specimen decreased within 1 hour, but increased after 3 houre. 4) For the separating medium, the easyfoil is superior to the olive oil in the aspect of improving the hardening effect of the immersed specimen.

• 건축역사연구
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• 제22권6호
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• pp.47-58
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• 2013

The purpose of this study is to analyze the cause of damage to the three storied stone pagoda of Bulguksa temple in GyeongJu. This report is attempted to making reinforcement and conservation plan through investigating and analyzing the cause of damage to that. The damage is caused by occurring of stress, degrading of stone strength, changing of underground soil structure, natural disasters and so on. Compressive stress, shear stress, bending stress and lateral pressure affected to the pagoda since built up. Ultrasonic examination data tells the strength of the stone. According to this result, strength of the stereobate stone materials is enough to support the weight of the upper ones. But we could found many other factors of the damage could consider, for example the problems occurred on building the pagoda construction and the weakness of the stone material(soft rock). And many environmental factors being changed in soil structure(subsidence of soil and degradation of bearing power of soil and freezing and melting of soil) can be seen as the cause of the damage. Natural disasters like earthquake, lightning and heavy rain were also thought to give direct impact to the damage. At last Concentration of compressive stress caused the crack and exfoliation on the stone materials and shear stress, bending stress and lateral pressure were main causes of the stereobate stone materials shearing.

• 한국농촌건축학회논문집
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• 제7권3호
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• pp.109-118
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• 2005

This study is to find out the plan intention of the central space through visual analysis on the east and west stone pagodas relative to a main Buddhist hall, and the relation between the stone pagodas in Hwaeomsa.(華嚴寺) According to the analysis of it in this study, we make conclusions as follows; 1) The east and west stone pagodas was arranged with overlapping each Daeungjeon(大雄殿) and Gakhwangjeon(覺皇殿) for the view of a specific viewpoint, on the right of Bojeru(普濟樓). 2) The centering around a compositive axis which connect Gakhwangjeon, stone lantern, and stairs, the axis of two stone pagodas is not coincident. 3) Courtyard in Hwaeomsa is separated by high a stone wall for reinforcement, but it is integrated into visual perception owing to height of two stone pagodas connected visual line to Daeungjeon and Gakhwangjeon.

• Computers and Concrete
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• 제23권3호
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• pp.189-201
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• 2019

Recent advances in the concrete technology are aiding in minimizing the use of conventional materials by substituting by-products of various industries and energy sources. A large amount of stone waste i.e., dust and slurry form both are being originated during natural stone processing and causing deadily effects on the environment. The disposal problem of stone waste can be resolved effectively by using waste in construction industries. In present work, Kota stone slurry powder, as a substitution of cement was used along with accelerators namely calcium nitrate and triethanolamine as additives, to study their impact on various properties of the concrete mixtures. Kota stone slurry powder (7.5%), calcium nitrate (1%) and triethanolamine (0.05%) were used separately as well in combination in different concrete mixtures. Mechanical Strength, modulus of elasticity and electrical resistivity of concrete specimens of different mix proportions under water curing were studied experimentally. The durability properties in terms of strength and electrical resistivity against sulphate and chloride solution attack at various curing ages were also studied experimentally. Results showed that accelerators and Kota stone slurry powder separately enhanced the mechanical strength and electrical resistivity; but, their combination decreased strength at all curing ages. The durability of concrete specimens was also affected under the exposure to chemical attack too. Kota stone slurry powder found to be the most effective material among all materials. Material characterization was also done to study the microstructural properties.

• 농업생명과학연구
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• 제51권6호
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• pp.15-22
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• 2017

The microstructure observation of seed surface structure is needed for protocols of breaking dormancy of seeds with physical dormancy. The seeds of Rubus species are surrounded by a thick, hard endocarp; together, the seed and endocarp make up the stone. We evaluate stone characteristics of 18 species of Rubus through optical microscopic observation, and correlate different stone characteristics with endocarp thickness. As a result of stone size comparison, Rubus species were classified as big stones group including R. parvifolius and R. idaeus, small stones group including R. longisepalus var. longisepalus, R. corchorifolius and R. hirsutus, and middle stones group including rest of the species. The result of this study revealed that stone size and the endocarp thickness in Rubus species was various characteristics in each species. Furthermore stone size and stone weight were also well correlated endocarp thickness and result indicated that heavy stones had harder endocarp than lighter one. Thus from the result of this study it can be presumed that only one stone characteristic approach may be sufficient to estimate other characteristics in Rubus.

• 헤리티지:역사와 과학
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• 제42권2호
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• pp.154-169
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• 2009

우리나라는 석탑의 나라라고 하지만 석탑이 발생하기 전에 고구려, 백제, 신라 삼국이 모두 목탑을 먼저 조영하였다. 석탑은 이후 삼국시대 후반인 7세기 초반에 이르러 석재로써 목탑을 모방한 미륵사석탑이 건립되었다. 우리나라 석탑은 목탑을 모방하여 발전되었다는 데는 아무런 제론이 없다. 또 석탑의 시원을 미륵사석탑이라는 데도 어느 누구도 이론이 없다. 600년대 백제와 신라 양국의 사찰창건과 조탑은 동일한 기술자들에 의해서 조영되었음에도 불구하고 백제에서는 석탑의 시원은 목탑에 두면서 신라에서는 석탑의 시원은 목탑에 두지 않고 전탑에 둔다는 것도 이해 할 수 없는 부분으로 지적하고자 한다. 따라서 필자의 견해는 신라석탑의 시원은 두 계보로 보고자 한다. 그 하나는 목탑에서 미륵사석탑과 정림사석탑을 거쳐서 감은사탑과 고선사탑으로 이어지는 계보이고, 다른 하나는 전탑에서 분황사모전석탑 - 의성탑리오층석탑 - 선산죽장동오층석탑 - 선산낙산동삼층석탑으로 이어지는 계보로 정리해 보고자 한다. 이렇게 석탑의 시원을 목탑에 두면서도 석탑옥개석 층급받침은 전탑 또는 고구려고분 천정에서 그 시원을 두기도 하여, 목조 공포의 약화된 표현이라는 의견과 논란이 가끔 있는데, 전탑의 층급은 같은 길이로 내밀고 있지만, 석탑 옥개받침은 처마부분을 더 많이 내미는 차이가 있다. 따라서 목조건물 공포에서 변형되었다고 주장하고자 한다.

• 보존과학연구
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• 통권7호
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• pp.11-23
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• 1986

Korea has a long history from several thousand years ago. Specially stonecultural properties were used for the long period in Korea. Ancient tombs of prehistoric age, Sukgul-am (stone cave), Chumsung-dae (astronomical observatory)and stone statue of Buddha in the period of three dynasties were made of stone. There after the foundation stone, mortarstone, millstone, and other stone facilities at home have been also used for a long time. For the conservation of the cultural properties, the ecological distribution of lichens was investigated with the stone buildings around tombs and multistory stonepagodas.1. Yoo-nung (The tomb of Emperor Sungjong) : The stone buildings of granitearound tomb about 80 years old are clean and solid in quality, but they were covered in places with three kinds of lichens as the circle forms of pale-green and dark-gray colored thallus in crustose type. They were examined ecological distribution, identification and measurement of lobe size of lichens.2. Yoong-nung (The tomb of son of Emperor Yung-jong) : Granite buildings around tomb about 200 years old are also clean, moreover, they were also covered with the same kinds of crustose lichens in overlap.3. Yung-nung (The tomb of Emperor Sejong) : More than seven species of crustose, foliose and one species of fruticose lichens were growing on thegranite stone buildings built in about 500 years ago.4. Shilluk-sa multistory brick pagoda : It was built at the Koryo dynasty more than about 700 years. More than 5 species of crustose folios and two species of fruticose lichens were growing well on the granite stone at shade area. It was assumed that foliose lichens as dominant species with the respect of ecological aspect.5. Shilluk-sa multistory marble pagoda : This marble pagoda was built at the middle period of the Koryo dynasty as the same age of multistory brick pagoda. It was covered with black colored thallus such as crustose lichens. It is seemed that only crustose lichens on the stone were due to the drymarble stone. From the results described above, distribution of lichens showed that only crustose lichens on the stone from the short history (about 100-200 years) were grown with small size of circle form, stone buildings over 500 years were covered with crustose, folios and fruticose lichens, and the lichens distribution on the stonemore than 500 years appeared more foliose and fruticose than crustose type. Therefore, it is suggested that the succession of lichens on the stone buildings iscrustose$\rightarrow$foliose$\rightarrow$fruticose.Parmelia mexicana, Cladonia floerkeana, Ramalina yasudae identified are described in this paper and other unidentified species of saxicolous lichens will bedescribed later.

• 보존과학회지
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• 제37권6호
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• pp.778-790
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• 2021

청주 비중리 석조여래삼존상 및 석조여래입상은 6세기 고구려 불상의 양식을 갖춘 중요한 국가지정문화재(보물)이다. 이들 석불상의 보존현황 파악 및 보존계획 수립을 위해 보존과학적 조사를 수행하였다. 석조여래삼존상 및 석조여래입상의 구성암석은 세립 내지 중립의 전형적인 흑운모화강암으로, 0.2(×10^-3 SI unit) 미만의 낮은 대자율 분포, 구성광물에서 서로 유사한 특성을 보여 동일한 기원의 암석으로 판단된다. 석조여래삼존상은 인근 노두의 암석과 광물 조성 및 입도, 전암대자율, 지구화학적 특성이 매우 유사하였으므로 성인적 동질성이 높은 것으로 해석된다. 한편 비중리 석조불상에서는 물리적, 화학적, 생물학적 요인이 복합적으로 작용하고 있는 것으로 확인되었다. 특히 석조여래삼존상과 여래입상 모두 전면에서 탈락이, 후면에서 균열과 박리박락이 우세한 경향을 보였다. 야외에 위치한 석조여래입상에서는 입상분해와 흑색조류가 발달하여 열악한 보존환경과 함께 풍화를 가속화하고 있다. 초음파속도를 이용한 비파괴 물성진단 결과, 석조여래삼존상과 여래입상의 풍화등급은 완전 풍화된 상태(CW)로 나타나 매우 낮은 물성을 지시하였다.