본 연구는 압화의 분야 중 가장 큰 비중을 차지하 고 있는 풍경화 작품에 대해 조사하였다. 2000~2007 년 출품작 중에서 풍경화 80작품을 선택하여 풍경화작 품에 사용되는 식물소재 및 부재료 등을 조사하였다. 풍경화 작품에서 사용된 주요 식물소재의 종류를 조사 한 결과 초본식물 소재의 사용이 67%로 목본식물 소 재의 33%보다 사용되는 비중이 컸다. 많이 사용된 초 본식물 소재는 루모라고사리, 이끼, 아디안텀, 냉이 등 이었고, 목본식물 소재는 편백, 황금편백, 포도나무 등 이었다. 봄 풍경화작품에 많이 사용된 식물소재는 냉 이, 포도나무, 조팝나무 등이고, 여름 풍경화작품에는 편백, 세라기넬라, 아디안텀, 가을 풍경화작품은 기린 초, 편백, 단풍나무, 겨울 풍경화작품에는 포도나무, 백 묘국, 에버라스팅 순으로 많이 사용되고 있었다. 식물 소재의 염색 유무조사에서 거의 대부분이 무염색 식물 소재였고, 일부 염색되는 식물소재는 조팝나무, 냉이, 쉬땅나무, 까치수염 등 흰색의 꽃과 편백, 세라기넬라 등의 잎이었다. 식물소재의 변색 정도에서 사계절 모두 변색이 잘 안 되는 소재가 67% 이상 사용되고 있었다. 식물소재 이외에 사용되는 부재료의 경우 바탕지는 압화전용 종이 65%, 한지 21%, 아크릴판 9% 등의 순이었고, 바탕지 위에 첨가된 부재료는 아크릴물감, 한지, 락카, 솜 등의 순으로 많이 사용되는 것으로 조 사되었다.

The bi-materials with Al-Mg alloy and its composites reinforced with SiC and particles were prepared by conventional powder metallurgy method. The A1-5 wt%Mg and composite mixtures were compacted under , and then the mixtures compacted under 400 MPa were sintered at for 5h. The obtained bi-materials with Al-Mg/SiCp composite showed the higher relative density than those with composite after compaction and sintering. Based on the results, the bi-materials compacted under 400 MPa and sintered at 873K for 5h were used for mechanical tests. In the composite side of bi-materials, the SiC particles were densely distributed compared to the particles. The bi-materials with Al-Mg/SiC composite showed the higher micro-hardness than those with composite. The mechanical properties were evaluated by the compressive test. The bi-materials revealed almost the same value of 0.2% proof stress with Al-Mg alloy. Their compressive strength was lower than that of Al-Mg alloy. Moreover, impact absorbed energy of bi-materials was smaller than that of composite. However, the bi-materials with Al-Mg/SiCp composite particularly showed almost similar impact absorbed energy to composite. From the observation of microstructure, it was deduced that the bi-materials was preferentially fractured through micro-interface between matrix and composite in the vicinity of macro-interface.

Al-42wt%Nb powder was prepared by high-energy mechanical milling(HEMM). The particle size, phase transformation and microstructure of the as-milled powder were investigated by particle size distribution (PSD) analyzer, scanning electron microscopy (SEM), X-ray diffractometery (XRD), transmission electron microscopy (TEM)and differential thermal analysis (DTA). The milled powders were heated to a sintering temperature at 1000C with under vaccum with vaccum tube furnace. Microstructural examination of sintered Ti-42wt%Nb alloy using 4h-milled powder showed Ti-rich phases (α-Ti) which are fine and homogeneously distributed in the matrix (Nb-rich phase: β-Ti). The sintered Ti-42wt%Nb alloy with milled powder showed higher hardness. The microstructure of the as quenched specimens fabricated by sintering using mixed and milled powder almost are same, but the hardness of as quenched specimen fabricated by using mixed powder increased due to solution hardening of Nb in Ti matrix. The aging effect of these specimens on microstructural change and hardening is not prominent.

This study introduces acceptance sampling plans and procedures for the inspection of bulk materials. This paper also presents statistical aspects of sampling bulk materials such as general principles and sampling of particulate materials.

Recently, all kind of 21C-typed electronic goods show the tendency of hightechnology and digital convergence rapidly. Also, failure mechanism which differs from original goods concept presents. Today, failure mechanism which differs from one that was happened by restricted harmful environment material before adapted the raw of environment material is changing the paradigm of reliability engineering. Thus, when applied the environment matter of original and secondary material at the electronic goods were removed, reliability assessment method and prediction stay into low level. This study suggests as solution to overcome these phenomenon. The study on the management method of environmental restriction substances which is recognized as important element in the reliability assessment about environment material of electronic goods and the study on reliability assessment method of PWB without environment material are progressed.

목적 : 본 연구는 초등학교에 재학중인 7～11세 자폐성 장애 아동 3명을 대상으로 구조화접근을 통한 부모교육이 아동의 문제행동 및 언어발달에 미치는 효과를 살펴보기 위하여 실시되었다. 연구방법 : 대상아동은 떼쓰기, 자해행동, 반향어 등을 보이는 전형적인 자폐성 장애 아동으로서 실험설계는 대상자간 복식기초선 설계(multiful-baseline across subjects)에 의하여 이루어졌다. 제공된 프로그램으로는 음악, 미술, 여가용 자료 사용 등의 가정에서 쉽게 사용할 수 있는 활동이 고안되었다. 종속변인은 문제행동 및 어휘 사용 빈도였다. 결과 : 문제행동의 경우 대상 아동 1은 기초선 평균 15.3회가 중재에서 12.5회로 감소되었고 15.5회로 유지되었다. 아동 2의 경우 기초선 평균 6.3회가 중재 평균 7.1회를 보였으며 유지 기간에는 6.5회로 나타났다. 아동 3의 경우 기초선 6.6회, 중재 7회, 유지기간에는 7.3회를 보였다. 언어발달에서의 결과로 아동 1의 경우 기초선 평균 26회였던 어휘수가 중재에는 40.5회로 증가하였으며 유지기간에는 44.3회로 나타났다. 아동 2의 경우 기초선 기간 동안 34회의 어휘수가 중재 기간 에는 17회로 나타났으며 유지기간에는 10.2회로 나타났다. 아동 3의 경우 기초선 34회, 중재기간 50.6회, 유지기간에는 81.5회로 높게 나타났다. 따라서 대상 아동 들은 문제행동상의 감소는 적게 나타났으나 언어발달에는 매우 높은 중재효과를 보였으며 유지 또한 높게 나타났음을 알 수 있었다. 결론 : 본 실험을 통하여 구조화접근을 통한 부모교육은 아동의 중재에 효과적임을 알 수 있었다.

In a view point of environment, the advanced electric contact material without environmental load element such as cadmium has to be developed. Extensive studies have been carried out on electric contact material as a substitute of Ag-CdO contact materials. In the present study, powder metallurgy including compaction and sintering is introduced to solve the incomplete oxidation problems in manufacturing process of electrical contact material. The contact material, fabricated in this study, was actually set in an electric switchgear of which working voltage is 462V and current is between 25 and 40A, for the purpose of testing its performance. As a result, it exceeded the existing Ag-CdO contact materials in terminal-temperature ascent and main contact resistance

실내 공기는 대기와는 달리 실내 건축 자재에서 유래된 물질로 오염될 수 있다. 본 연구는 실내자재인 카펫에서 방출되는 휘발성 유기화합물의 생물학적 영향을 평가하기 위하여 수행되었다. 카펫과 자주달개비 BNL 4430 꽃차례를 환경노출시험용기에 넣고 일정시간 노출을 실시하였고 흡착관의 VOCs에 대한 화학분석을 실시하였다. 화학분석결과 카펫에서는 12종의 VOCs가 방출되는 것이 확인되었으며 이중 스틸렌(71.9μg m-3)과 톨루엔(

Carbonation in concrete structures has been handled as the most fundamental and critical factor related to the durability of reinforced concrete. As a result, there have been efforts to develop repair materials to control carbonation As one of these efforts, alkali recovery agents have been presented as materials for increasing the re-alkalization and durability of carbonated concrete structures. However, in applying them in the field, the performance and quality of concrete recovered after an alkali recovery agent is applied has not been fully assessed. Therefore, to examine the recovered performance of concrete structures resulting from the application of an alkali recovery agent, the present study assessed the depth of carbonation and the degree of deterioration of 20 years or older reinforced concrete structures, and analyzed the quality of concrete after applying an alkali recovery agent to the structures. This study aimed at providing basic information for the application of alkali recovery agents in the field. In this experiment, alkali recovery agents of the lithium silicate line, which are most common in Korea, were applied and cured using concrete of the same size. The degree of recovery was investigated according to the length of time in the initial curing stage, and based on the investigation, the maintenance performance of the alkali recovery agent was assessed according to the age of exposure to the open air. For these tasks, this experiment sampled concrete of different degrees of deterioration, applied alkali recovery agents to them, and observed re-alkalization and changes in the internal texture of the concrete.

In recent years, the number of complaints about indoor air pollution caused by volatile organic compounds(VOCs) has increased. It is important that evaluating and understanding emission of indoor air pollutant from building materials. The aim of this study was to evaluate emission test methods for liquid phase building materials such as paint, adhesive and sealant, and to determine the emission of total volatile organic compounds(TVOC) from liquid phase building material. The quantity of TVOC emission was measured by a gas chromatography/mass spectrometry (GC/MSD). It was found that liquid phase building materials were classified according to their use and ingredient. The TVOC concentration from oil-based paint was the highest among 8 groups of test materials. The unidentified volatile organic compounds occupied 83.0% of TVOC emission from test materials. The aliphatic hydrocarbons and aromatic hydrocarbons occupied 7.2%, 6.9% of TVOC, respectively. The concentration of TVOC decreased by an increase during emission test period. After 3 days, the concentration of TVOC from paint, adhesive and sealant were about half of the concentration at the first day. The ratio of concentration between 7 days and 1 day was 0.11～0.15 from water-based paint and 0.46～0.48 from epoxy adhesive.

The purpose of this experiment was to find out the effects on metal corrosion of 2 types of tree, 7 types of wood based products and 4 types of cement that is currently being used as internal museum materials. By using the Oddy test as a corrosion test, with the materials that are used in the museum and the metal test pieces(Gilding, Silver, Iron, Bronze, Copper) are exposed in a high temperature( 60℃ ) and humidity for 28 days. After 28 days, we compare and analysis the difference between the metal test piece that was used before and after the test. We found that gilding and bronze did not occur corrosions on the surface but iron(Fe)and copper(Cu) also silver(Ag) had corrosions on the surface in different forms.

전기변색(electrochromism, EC)소자는 여러 가지 색으로 발색이 가능하고, 낮은 구동전압과 메모리성이 좋은 특징을 갖고 있으나, 내구성이 부족하고 발색 및 소색 속도의 감소, 반복에 따른 완전한 소색과 응답성이 떨어져 실용화에 문제점를 나타내고 있다. 따라서 본 연구에서는 viologen 유도체와 leuco dyes의 안정성 및 내구성을 향상시키기 위하여 이들 색소들의 산화환 원전위와 산화방지제(AO-60)를 사용하였을 때의 cyclic voltammetry와 chronocoulometry를 비교 측정하였다. 그 결과 leuco dye인 CVL과 ODB-2에서는 charge값의 안정성이 10% 이상 증가하였고 Orange-DCF, Red-DCF, Green-DCF에서는 charge값이 5% 이상 상승한 결과를 나타내었다. 모든 색소가 산화방지제를 첨가하였을 경우가 안정한 상태로 내구성을 유지하는 것이 확인 되었다. Benzyl viologen의 경우 AO-60 첨가에 의하여 불안정한 산화상태를 안정화시키는 것을 확인하였다. 따라서 본 연구결과 leuco dye에 의한 EC 소자의 가능성과 칼라화에 대한 가능성을 보임을 확인하였다.

Since the 17th century, the society of Joseon dynasty belongs to a period of rapid transition in many fields. As the building is a result to be produced on the basis of a society and economy, the general transition in a society is to be reflected into a process of building construction. Especially, a study on the material supply system of economic base in a process of building construction is one of very important factors in an understanding or estimate of a building. On the premise, this paper is to examine the supply system of iron materials and the tools in the construction of the government managed buildings in the late of Joseon dynasty on a viewpoint of productivity. Construction reports and other documents in those days are examined for the study. Following conclusions have been reached through the study. 1) The general supply method of iron materials for a large-scale government construction was based on 'byulgong', that is, a kind of tribute. 2) Various methods were selected in the supply method of iron materials for government use in the late of Joseon dynasty. The priority order of choice in its government policy was put on an easiness of amount security, on a minimum of expenditure, and on an efficiency of construction execution. 3) The manufacturing technique of weaponry was used in the production method of iron materials and the tools for government use. The cooperation of the official, the army, and the merchant had improved the manufacturing technique of building construction.