자연과학적 데이터를 활용한 풍납토성 백제토기의 분류 방안 연구

문은정 ( Eun Jung Moon ),강희준 ( Hee Jun Kang ),한민수 ( Min Su Han ),이한형 ( Han Hyoung Lee ) 백제학회 2011 백제학보 Vol.0 No.5

본 연구는 풍납토성 출토 백제토기를 대상으로 현장에서 소성온도에 따라 토기를 분류할 수 있는 외형관찰 기준을 마련하는데 자연과학적 데이터를 활용하고자 하는 연구이다. 소성온도는 토기의 경도, 밀도 풍을 포함한 다양한 물리화학적 특성에 영향을 미친다. 이 중 현장에서 측정이 가능하고 유용한 것이 경도이다. 그러므로 우리나라의 발굴현장에서 적용하고 있는 경도 측정기준을 적용하여 토기를 분류하고, 자연과학적 분석을 통하여 이들 토기의 마이크로비커스 경도, 밀도, 흡수율, 조직의 유리질화도, 광물학적 특성 등을 측정하여 현장에서 적용하는 경도분류 기준과의 상관관계를 비교연구하였다. 그 결과, 발굴현장에서 동전의 긁힘에 의해 주로 행해지던 연질과 경질의 이분법적 분류는 연질과 연경질, 경질의 세 단계로 세분됨을 알 수 있었다. 소성 온도 추정 결과, 연질은 1,000˚C 이하, 연경질은 1,000~1,100˚C, 경질은 1,200˚C 이상에서 소성되었을 것으로 판단된다. 한편, 3단계로 분류되는 토기들의 각 단계별 외형적 공통점을 추출하여 자연과학적인 정밀분석 없이 육안관찰만으로 토기를 3단계로 분류할 수 있는 관찰기준의 제시를 시도하였다. 이러한 기준은 파괴분석을 하지 않고도 토기의 외형적 특징을 이용하여 토기의 대략적인 물성과 소성온도 추정을 가능하게 할 것으로 기대된다. 단, 이러한 기준은 풍납토성에서 출토된 한성백제시기의 토기 중에서 배류와 호류 등 색상이 단조로운 제한된 기종을 중심으로 한 결과라는 한계를 가진다. 따라서 추가적으로 여러 기종의 다양한 색상을 가진 토기들을 대상으로 풍납토성 출토 토기의 경도별 분류가 가능하도록 수정·보완하는 연구를 진행할 예정이다. Observation methods of appearance were studied to establish a systemized classification criteria according to the firing temperatures of excavated earthenware from the Pung-Nap Mud Castle. A firing temperature has an impact on various physical and chemical properties including hardness and density of earthenware. Of all the properties, hardness can be measured in situ. Therefore, the earthenware were categorized according to the measurement method of hardness which can be applied and useful method for archaeological sites. In addition, the correlation between the measurement method and micro Vickers hardness, absorptance, degree of vitrescence and mineralogical properties of the earthenware were studied by means of a natural scientific analysis. The result suggests that the dichotomous way of classification based on a scratching method determining whether it is hard or soft should be categorized into three stages; soft, soft/hard and hard. According to the presumption of the firing temperature, it is believed that the earthenware were fired at below 1,000℃, 1,000~1,100℃ and 1,200℃ respectively. The systemized observation method was proposed to enable the earthenware to be categorized into three stages using visual observation without a detailed scientific analysis. The method will make it possible to estimate roughly the physical properties and firing temperature of the earthenware with only visual observation. However, it has limits as it was established focusing on certain types such as Cups and Jars among the Han-Sung Baek-Je earthenware. Therefore, a further study is planned to be carried out on various objects excavated from Pung-Nap Mud Castle in order to enable categorization on the basis of hardness of the earthenware.

칼슘투여가 혈중 지질과 칼슘대사에 미치는 영향

한성철,신말순,전형권 龍仁大學校 1998 용인대학교 논문집 Vol.16 No.-

The study was carried to investigate the effects of a long term calcium upon blood lipid metabolism in athletes, The effects of calcium supplementation and hematological variables which are related to calcium metabolism, Subjects(N=30), who were 30 males of athletes, were randomly assigned to two group(placebo group, N=15, experimental group N= 15. Each subject in experimental group was ingested a tablet containing 500mg of calcium three times a day for 8 weeks. Hematological variable were measured pre and post 2, 4, 6, 8 weeks after the tablets ingestion. The results through the statiscal analysis of blood components, calcium, tatal-cholesterol, HDL-C, LDL-C, Total-cholesterol/HDL-C, in lipid components were as follow; 1) Serum calcium was significantly increased in calcium croup after 2 weeks and maintained through out the entire experimental period(P<0.75), while showed no significant change in placebo group. There were significant differences between two group(calcium croup, placebo group). 2) Total cholesterol was decreased after 2, 4, 6, 8 weeks in Calcium group but there was no significantly decreased in placebo group. 3) LDL-C was significantly decreased in calcium group after 2 weeks and maintained through out the entire experimental period(P<0.05), but there was no significantly decreased in placebo group. There were significant differences between two group(calcium group, placebo group). 4) HDL-C was significantly increased in calcium group after 4 weeks and maintained through out the entire experimental period(P<0.05), while showed no significant change in placebo group. There were significant differences between two group(calcium group, placebo croup). 5) TC/HDL-C was decreased after 2, 4, 6, 8 weeks in calcium group but there was no significantly decreased in placebo croup . There were significant differences between two group (P<0.05).

자연 절리면 전단강도의 크기에 영향을 미치는 요인

임한욱,이무형 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

자연 절리면 전단강도의 크기에 영향을 미치는 여러 요인중에서 시험편의 크기와 형상효과를 검토하기 위하여 4가지 형태와 6가지 크기별로 직접전단시험을 실시하였다. 즉 수직옹력을 0.29에서 2.65 MPa까지 서로 달리하면서 각 응력별로 최대전단강도, 잔류전단강도, 최대 수직변위 및 강성, 평창곡선 그리고 거?계수를 구하였다. 연구결과 시험편의 크기와 전단강도와 변형거동에 미치는 영향을 상당한 반면에 형태 효과는 거의 없었다. 또한 시험편의 크기가 커질수록 절리 거?계수와 절리 압축강도는 감소를 보였으며, 전단강도 역시 감소하였다. 즉 시험편의 크기가 12.25에서 361 ㎠로 증가함에 따라 전단강도는 최대 72%, 잔류전단강도는 약 57%, 전단강성은 약 80 %감소하였다. 낮은 유효수직옹력하에서 절리암반의 최대 전단강도를 평가하기 위하여 기존의 Barton식을 보정한 새로운 경험식을 제안하였다. The effect of shape and size of specimens on the shear behaviour of joints is studied by performing direct shear tests on four different shapes and six different sizes. The peak shear strength, residual shear strength, peak shear displacement, shear stiffness and dilation curves were also measured with the different normal stress(0.29-2.65 Mpa) and roughness parameters. The results show significant scale effects on the both the shear strength and deformation characteristics, while shape effects can not nearly be found. It is also shown that as a result both the joint roughness coefficient(JRC) and the joint compression strength(JCS) reduce with increasing scale. Shear strengths are also generally decreased with increasing joint area. A series of shear tests shows about 72% reduction in shear strengths, about 57% in residual shear strength, about 80 % in shear stiffness as the area of specimens in crease from 12.25 to 361㎠. To estimate peak shear strength of jointed rock under low normal effective stress, the modified Barton's equation is suggested. ▷ 원문 참조 ◁ where A and B are coefficient to be determined by regression analysis on experimental data.

남성·여성의 혼합DNA에서 Y-STR의 유효성 검토

이양한,신상철,이은정,박정우,구형남,김대열,김윤신 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

數種의 增量劑 粒度와 增量比率에 따른 尿素樹脂合板의 接着 特性

楊翰承,尹炯雲,李弼宇 서울대학교 농과대학 농업개발연구소 1993 서울대농학연구지 Vol.18 No.2

The purpose of this research was to evaluate and to examine the substitutional feasibility of paper sludge extender instead of wheat flour. As the extending materials, taro flour, paper sludge, wood flour and wheat were selected and dried at 103±2℃ during 24 hours in the drying oven and pulverized into three levels(-50∼+100, -100∼+200, -200∼mesh). The extenders were mixed with urea formaldehyde resin in the ratio of 10, 20 and 30%. After plywoods were manufactured by the above extended ratios, dry and wet shear strength were examined. The results obtained at this research were summarized as follows : 1) In 10% extionsion on -50∼+100 mesh particle size, paper sludge showed the highest dry and wet shear strength among the extenders. 2) As 20% extension, wheat showed the highest value. 3) the shear strength was affected by the particle size and extending ratios, and the shear strength extended by paper sludge powder was sensitively varied with particle sizes and extending ratios. 4) The shear strength extended by taro and wheat flour were less affected by the particle size of extender. Therefore, the particle size of extender would be considered along the extention ratios and extender types.

가변구조 제어시스템의 Luenberger Observer에 관한 연구

탁한호,이형기,박양수,권세현 釜山工業大學校 1991 論文集 Vol.33 No.-

This paper presents an analysis of the stste observer-based robust speed control of a self-controlled synchonous motor (SCSM). A Variable structure control (VSC) technique is utilized to achieve robust (paramater-insensitive) characteristics. The speed and acceleration signals required for the implementation of the variable structure speed control (VSSC) are dynamically estimated with stste observer. One kind observer-the Luenberger full order observer-air explored in this paper. The results obtained that Luenverger observers do estimate the system ststes accurately when the system parameters vary. The design methods and the simulation results presented demonstrable the potential of the proposed scheme.

섭동계수를 갖는 단일 자기부상 시스템의 강인한 제어기 개발에 관한 연구

이형기,변기식,신춘식,탁한호 釜山工業大學校 1991 論文集 Vol.33 No.-

A EMS(Electro Magnet Suspension) nonlinear system is linearized by using Taylor series expansion around nominal point. A method of stability analysis for a low-order characteristic equation with perturbed coefficients is proposed. A PID controller to the linearized EMS system is designed by the method. Computer simulations are carried out in the system with the controller for various masses.

미소균열 탐상을 위한 자기광학소자를 이용한 비파괴탐상법의 제안과 적용

이형노,박한주,庄子 哲雄 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.2

항공기나 대형 플랜트 등의 경년구조물에 있어서 제조 및 설계 혹은 작업환경 등에 의해 발생하는 미소결함은 응력부식파괴로 이어지는 결정적인 원인으로 알려져 있다. 따라서 제조단계에서의 결함의 검출뿐만 아니라 운전개시 후에 있어서도 비파괴검사에 기초를 둔 정기적인 건전성평가가 요구된다. 특히 구조물내의 미소균열 평가는 구조 건전성 평가에 있어서 중요한 과제라 할 수 있다. 자기광학소자를 이용한 비파괴탐상법은 균열부근의 누설자속에 의한 자구 및 자벽의 변화를 이용하여 균열정보를 화상형태로 얻는다. 그러므로 빠른 탐상속도와 결과데이터 해석의 용이 그리고 실시간적으로 탐상결과를 획득할 수 있다는 장점을 지니고 있다. 본 논문은 자기광학소자를 이용한 새로운 비파괴적 탐상법을 제안하고, 본 탐상법을 이용하여 구조물에 존재하는 표면결함의 검출가능성 및 균열깊이의 평가를 실증하였다. 표면결함을 갖는 시험편과 파이프의 내면에 존재하는 피로균열을 대상으로 실험을 실시한 결과, 표면결함의 위치 및 2차원적 형상을 화상형식으로 얻을 수 있음을 증명하였다. 또한 피로시험중의 시험편을 대상으로 균열발생 및 균열진전과정을 평가를 통하여 원격탐상의 가능성을 제시하였다. Micro-defects induced by design and production failure or working environments are known as the cause of SCC(Stress Corrosion Cracking) in aged structures. Therefore, the evaluation of structural integrity based on micro-cracks is required not only a manufacturing step but also in-service term. So we introduce a new nondestructive inspection method using the magneto-optical film to detect micro-cracks. The method has some advantage such as high testing speed, real time data acquisition and the possibility of remote sensing by using of a magneto-optical film that takes advantages of the change of magnetic domains and domain walls. This paper introduces the concept of the new nondestructive inspection method using the magneto-optical film, also proves the possibility of this method as a remote testing system under oscillating load considering application on real fields by applying the method to four types of specimens.

혈관내 초음파로 증명된 관상동맥 가성협착 1예

박형섭,허승호,한성욱 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

토착형 P. vivax에 의한 Malaria 4례

박형렬,이성원,이경미,김태겸,한진영,손춘희,정원태,김성은,김종성 동아대학교의과대학 1997 동아의대학술지 Vol.9 No.2