• 한국구조물진단유지관리공학회 논문집
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• 제9권3호
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• pp.161-168
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• 2005

홍예교랑에서 무사석 및 적심석이 구조적특성이나 내하력에 미치는 영향에 대해서는 아직도 제대로 연구된 바가 없다. 특히 대부분의 홍예형 구조들이 문화재로 지정되어 있어 실물테스트를 하는 것은 매우 곤란하다. 석조구조물의 동적특성을 파악하면 접촉면의 강성을 파악할 수 있으므로 구조해석시 유용한 정보를 구할 수 있다. 본 연구는 무사석 및 적심석이 없는 5개의 홍예구조물과 우리나라 18개 홍예교량의 동적특성을 비교 분석함으로써 무사석 및 적심석 유무에 따른 고유진동수의 차이를 규명하는 방법으로 수행되었다. 연구결과 줄눈에 모르타르를 사용하지 않은 홍예구조의 경간에 따른 고유진동수는 우리나라 홍예교의 고유진동수보다 현저히 낮은 것으로 조사되었으며, 이러한 사실을 통해 볼 때 무사석 및 적심석이 홍예교의 고유진동수를 높이는 역할을 함을 알 수 있다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.231-235
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• 2007

Stone Industry in our country is classified mainly in view of supply of raw materials ingredients, as follows: Stone-Quarrying Industry who develops the natural resources, Stone Processing Industry who processes the quarried raw ore into construction materials and stone-products, Stony Mountain-Aggregate Industry who supplies the elementary raw materials ingredients to construction section, respectively. Among them, while Stone Processing Industry sells its turnover around billion-Won level per annum per a company, most of other job sites are paltry, adopting less than 10 employees, and it is real state that their working environments are also very coarse. The Noise originated from processing-instrument which generates at such Stone Processing Industry is as so repeatedly reiterating Loud Noise that most of the spot workers are forcedly imposing such dangers as the severe unpleasant feeling and hearing impairments. On this viewpoint, this Research is now analyzing on the frequency characteristics with regard to the Noise that generated from various processing-instruments, and then based on this, in order to grasp the influence of the Loud Noise generating when process the stone materials, this study has ever evaluated it with PSIL and NR. It is considered that such data could be used as the valuable material for establishment of a comfortable working environment hereafter.

• 건축역사연구
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• 제20권1호
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• pp.61-75
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• 2011

This study aims to investigate the changing aspects about research methodology of stone pagoda from the period of Japanese colonial to now. There were the differences in purpose, method and analysis of the research according to each period. In Japanese colonial period, the purpose of research was to make lists of almost stone pagodas in Korea. Following this, Japanese researchers conducted detailed research for academic purpose. They took measurements of stone pagodas and made drawings. After liberation the research was focused on the relics contained in pagodas. They proceeded to investigate the inner relics in order to attract the attention of the people. In the late 1900's, the repair works of cultural heritages were increased. Many reports of the repair works were released and sent to administration offices. The reports contained the change aspects of situation between before work and after with drawings or simple investigation documents. In the 1990's, the restoration works for important stone pagodas were started by the National Research Institute of Cultural Heritage. Since then, researches from various way - architectural and conservational researches about historical interpretation, shape, structure, proportion, technique, etc. - progressed for careful restoration and accurate study. In Recent years, various professional organizations(in the field of structure, physics, chemistry, biology, lithology, etc.) started to join the researches. Researches conducted studies directly with the stone pagodas, as well as conducting indirect studies with the stone pagodas, such as the structural stability of stone pagodas, the characteristics of rock, and conservation chemicals. Today the research project 'The preservation project of stone cultural property' is being conducted by the National Research Institute of Cultural Heritage. The purpose of this project is to gain more detailed and accurate investigation documents to be provided for the people. In conclusion, researches from various fields must be included in the research. Furthermore, a synthetic study should be done through comparing similar characteristics or different characteristics among many research results.

• 한국공간구조학회논문집
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• 제18권1호
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• pp.45-53
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• 2018

Following the earthquake that shook the city of Gyeongju, Korea, in 2016, it became apparent that research on the safety of cultural heritages against the seismic hazards is necessary in Korea. Predictions of how historically significant stone pagodas would behave the earthquakes anticipated in near future, which are the subject of this study, is also required. In this study, the dynamic characteristics of 15 cultural heritage designated stone pagodas of Korea were investigated, including natural frequency and damping ratio, and the stiffness of the stone material and its contact area were determined using eigenvalue analysis by assuming the stone pagodas to be multi-degree-of-freedom structures. The results of this study enable the structural modeling of stone pagodas using a finite element analysis program and the method is expected to be useful in assessing the structural safety of stone pagodas against vertical loads as well as lateral forces, including earthquakes. Also, by identifying the dynamic characteristics of the structures, the results of this study can be utilized as a nondestructive testing method to determine the rigidity of cultural heritage structures and to identify inherent problems. The natural frequencies of the Korean stone pagodas were measured to be within 3.5~8.3Hz, excluding cases with distinct natural frequency results, and it was determined that the natural frequencies of the stone pagodas are influenced by various parameters including the height and joint stiffness of the structures.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.108-112
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• 2005

In this research, the physical properties of fresh concrete using lime stone powder as a part of cement were investigated. Fresh concrete using lime stone powder was prepared with various lime stone powder replacement($5{\sim}12$ volume %) for cement and the quantities of sand aggregate ratio in concrete were 47.3%, 48.5% and 49.4% of ratio of sand aggregate. The workability, flowing characteristics, air content and bleeding of concrete using lime stone powder were tested and the results were compared with those of ordinary portland cement concrete. In the experiment, we acquired satisfactory results at the point of fresh concrete characteristics using lime stone powder within the replacement ratio of $8{\sim}12%$ and the optimum quantity of sand aggregate ratio in concrete was found to be $48.5%{\sim}50%$ of ratio of sand aggregate.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.189-195
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• 2004

It compared quality characteristics for the stone surface treatment system and its products. With the result, the flame burner equipment was mainly used to the surface treatment of granite, but it occurred greatly the high temperature, the rock fragment, the noise and dust. For the other side, the whetstone polishing machine for the polishing was a maintenance for the specific physical properties of stone, and it did not occur the stone fragment and the dust. The durability of the stone products due to the flame burner was investigated with that it falls to $20\sim25\%$ more than the surface treatment by the whetstone polishing. Share's hardness of the polishing products in the durability test showed more greatly index than the flame burner and conventional product. The polishing products of Pochon stone in the case of the abrasion resistance showed great more $15\%$ than the general products, more $9\%$ than the products by the flame burner.

• 보존과학회지
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• 제30권2호
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• pp.205-217
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• 2014

이 연구에서는 서산 신송리유적에서 출토된 청동기시대 석기를 대상으로 재질분석과 석재의 원산지를 검토하였다. 연구대상 석기는 점판암제 석재 1점, 석촉 반제품 2점, 갈판 1점 및 안산암질암 석촉 반제품 1점이다. 점판암은 유적지 일대에서 쉽게 관찰할 수 있는 암석이나, 안산암질암은 10km 이상 떨어진 부석면 간월도와 안면읍 황도리 등에서 산출된다. 석기 구성암석과 추정산지 암석에 대한 비교분석 결과, 점판암제 석기는 재질 및 암석광물학적 특징이 거의 동일하였으나, 안산암질암 석기는 추정산지 암석과 일부 다른 특징이 나타났다. 주원소, 미량원소, 호정 및 불호정원소에 대한 비교에서도 점판암제 석기와 추정산지 암석은 동일한 경향을 보였으나, 안산암질암 석기와 추정산지 암석은 다소 차이가 있다. 따라서 신송리유적에서 출토된 점판암제 석기는 유적 주변에 분포하는 암석을 원료로 제작한 자급형 석기로 해석된다. 그러나 안산암질암 석기는 외래형 석기로 추정되며, 광역적 조사를 비롯한 주변 유적에서 출토된 화산암제석기에 대한 연구를 병행하여 종합적 해석이 필요할 것으로 판단된다.

• 한국공간구조학회논문집
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• 제8권3호
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• pp.83-90
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• 2008

우리나라의 석조문화재를 모델링할 때 불연속면을 갖는 구조재의 강성을 어떻게 규명하느냐가 매우 중요하지만 원형보존을 해야 하는 문화재의 특성상 이를 파악하기란 매우 곤란하다. 이를 위해 본 연구에서는 비파괴조사를 이용하여 고유진동수를 측정한 후, 시행착오법을 이용하여 측정된 고유진동수와 컴퓨터 모델링 결과 파악된 고유진동수를 비교함으로써 불연속면의 강성, 구조재의 탄성계수 등 홍예교를 이루는 재료의 구조적 물성을 추정함으로써 컴퓨터 모델링을 하는 방법을 제시하고 홍예교량의 동적특성에 영향을 미치는 요인을 분석하였다. 연구결과 무사석 및 적심석의 강성이 홍예교의 동적특성에 가장 큰 영향을 미치는 것으로 분석되었다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.90-99
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• 2004

Stone column is one of the soft ground improvement method, which enhances ground conditions through ground water draining, settlement reducing and bearing capacity increasing complexly by using crushed stone instead of sand in general vertical drain methods. In recent, general construction material, sand is in short of supply, because of the unbalance of demand and supply. Also, the bearing capacity improving effect of stone column method is needed in many cases so the bearing capacity estimation is considered as important point. Nevertheless, adequate estimation methods to predict bearing capacity of stone column considering stone column and improving ground behavior reciprocally is not yet prepared. To contribute this situation, bearing capacity behavior of stone column were simulated as numerically on various property cases of crushed stone and surrounded ground. Through the numerical analysis of simulation results, bearing capacity behavior prediction formula was suggested. This formula was verified by comparing the prediction result with in situ test.

• 한국환경보건학회지
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• 제18권2호
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• pp.75-81
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• 1992

An experimental investigation has been carried out to evaluate the characteristics in wastewater treatment using an anaerobic packed bed bioreactor with ceramics, rubber sponge, soft stone A, and soft stone B as carrier. The results of the work have shown that soft stone A as a carrier was superior to other carriers in methane production, then the content of methane for soft stone A was about 70%. First of all, soft stone A had higher efficiency of the COD removal than the others in response of passing the operation, as well as it had a low volatile acid in reactor. In addition, the slope of methane production with respect to the removal of COD ($m^{3}CH_{4}$/kgCOD) was 0.58 for soft stone A. In biomass hold-up equation for each carriers, the equation of soft stone A was m$_{p}$=714 ($C_{o}/0.41+C_{o}$) and it was the largest in this experimented carriers. Based upon the results obtained, it is suggested that the major effective carrier in wastewater treatments within the packed bed bioreactor used in this experimental work by soft stone A.