• Journal of Conservation Science
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• v.30 no.2
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• pp.149-156
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• 2014

Low oxygen treatment and heating treatment are used to prevent insects in the field of food science. These eco-friendly control methods can be applied to biological control technique in conservation treatment of organic cultural properties. To evaluate material stability, low-oxygen treatment and low oxygen treatment are applied to wood, pigment, paper and textile that are related to historical wooden buildings. As a result, wood moisture content declined after low oxygen treatment. But decline rate is a little, so it can be expected to turn back original state as time passes. And test result on pigment, paper, textile of chrominance and strength of test materials are stable. But after heating treatment, pigments are separated.

• Korean Journal of Materials Research
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• v.7 no.9
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• pp.717-722
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• 1997

노후화된 고온설비의 안정성 및 효율적인 운전조건을 확보하고, 고온부재의 취성파괴 방지를 위해서는 재질열화의 정량적 평가는 매우 중요하다. 그러나 현장실기에서 기계적 성질의 평가를 위한 대량의 시험편 채취는 거의 불가능하다. 따라서, 실기부재의 강도에 영향을 미치지 않는 범위에서 플랜트 구조물의 재질열화 평가를 비파괴적으로 검출 평가할 수 있는 새로운 시험방법들의 개발이 요구된다. 본 연구에서는 화력설비 부재의 다양한 탄소강을 대상으로 재질열화도 평가를 위한 전기화학적 양극분극시험법의 적용 가능성을 조사하였다. 또한 양극분극시험에 의한 재질열화평가 유효성을 조사하기 위해 전기화학적 시험결과를 입계부식시험결과와 비교.검토해 보았다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.109-110
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• 2015

강재 부표는 구조적 강도가 우수하고 철재의 절단, 용접 등의 간단한 가공으로 원하는 모양을 쉽게 만들 수 있는 장점은 있으나, 소재의 특성상 해수에 의한 부식과 흘러나오는 페인트로 인한 환경오염, 무거운 중량, 이에 따른 설치 비용과 유지보수 비용의 증가 등 여러 가지 극복하기 힘든 문제점과 한계점을 가지고 있다. 이 연구에서는 우리나라 표준형 부표의 기본 소재로 사용하고 있는 강재 대신 친환경적인 경량재질의 소재를 이용한 부표를 모듈 구조로 설계함으로써, 기존 강재 부표의 문제점과 한계점을 뛰어넘어 효율적인 유지관리와 운영이 가능하고, 해양환경 오염의 방지와 경량화를 실현시킬 수 있는 표체 개선 방안을 제시하고자 한다. 또한, 경량 재질을 이용한 부표의 안정성과 경제성 검토를 통해, 기존 강재 부표와 비교함으로써 안정성과 경제성을 평가하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.1000-1002
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• 2012

The material with superior biocompatibility and physical-chemical stability is required to fabricate high sensitive biosensors. Many kinds of biomaterials have been evaluated to apply for bioindustry. Recently, carbon based diamond and graphene thin films have been focal pointed as bio applications and their possibility is partially evaluated. Diamond thin film has many advantages for electrochemical and biological applications, such as wide potential window (3.0~3.5V), low background current and chemical-physical stability. And graphene film has many advantages as biomaterial, chemical-physical stability and conductivity. In this work, we have cultured human nerve cell (SH-SY5Y) on the nanocrystalline diamond, mirocrystalline diamond, graphene film and cell culture dish. We use MTT assay to evaluate the characteristics of cell culture on the substrates. As a result, nerve cell is well cultured on the carbon based diamond and graphene films as similar as cell culture dish. We expect that carbon materials have been applied for bioindustry such as biosensors.

• Korean Journal of Materials Research
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• v.6 no.3
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• pp.253-263
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• 1996

고온.고압하에서 장시간 사용되는 고온부재용 구조물은 경년열화현상을 나타낸다 그러므로 구조물의 안정성 측면에서 재질열화의 정도를 정량적으로 평가하는 것이 중요하다. 그러나 실기 구조물에서 채취할 시험편의 크기와 수는 제한이 되기 때문에 새로운 비파괴적인 평가법이 요구되고 있다. 따라서 본 연구에서는 화력발전설비에 이용되는 탄소강과 페라이트강에 대한 열화도의 평가를 위해 입계부식법의 적용 가능성을 조사한다. 시험결과, 재질열화의 정도는 사용시간보다 사용온도에 더 큰 영향을 받았으며, Larson-Miller인자와 열화도([$\Delta$DBTT]SP)사이의 관계는 선형적이었으나, 강종에 따라 다른 기울기를 보였다. 반면, 연성-취성천이온도 ([$\Delta$DBTT]SP)와 격자절단비(Ni/No)와 관계는 강종에 무관하게 선형적인 비례관계를 나타내었다. 또한, [$\Delta$DBTT]SP와 Ni/No 의 관계로부터 입계부식법은 페라이트계 강뿐만아니라 탄소강에 대해서도 유용한 재질열화 평가 방법임을 알 수 있었다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2005.11a
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• pp.240-246
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• 2005

A series of combustion tests of a 30-tonf-class full scale liquid rocket thrust chamber under development has been carried out to verify its design. The test results revealed decent performance in the aspects of efficiency. The combustion stability is one of the most important parameters of liquid rocket engine in addition to the efficiency. Assessment tests of combustion stability must be accomplished to confirm the possibility of combustion instability due to spontaneous or external disturbances. The combustion stability rating tests of the full scale thrust chamber with temporary baffles made of stainless steel were carried out utilizing pulse guns to estimate combustion stability characteristics. The tests results show highly stable combustion stability characteristics. The outcome acquired from the present experimental study will be used to design an actively cooled baffle that can survive for the life time operation of the thrust chamber.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.5 no.1
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• pp.47-52
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• 2011

The functional loot orthoses, when wearing shoes, are in the direct contact with bottom of foots to improve and recover the correctness of abnormal lower limb musculoskeletal imbalance and the primary role of foot and also, it can act to keep the balance and weight of body and support the weakened region, so that it is very helpful to keep body balance for the standing position. In this paper, it was researched that foot orthoses which is accommodable for the function of impact absorption including the gait stability affect on the balanced performances of body in according to the formation and the material of foot part. Taking into account the balanced performances by using the sway velocity, the estimation and comparison of the effects on the balanced performances by each formation and material for foot orthoses was evaluated into significant values(p<0.006) in only the eye-opening posture with Firm state, In this posture, the static process performed by each foot formation reveals in order of normal foot(p<0.010), flat foot(p<0.000) and hollow foot(p<0.003) and then, on the base of each formation of foot part, the result that analyze the effects of the materials of foot orthoses on the balance performance appeared showing that soft materials is more effective on the normal foot and, on the other hand, rigid materials is more effective in balancing on flat foot and hollow foot.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.461-462
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• 1999

고온고압의 연소 분위기를 생성시키는 석탄이용 발전 시스템 및 소각로, 유리공장 등에서 발생되는 먼지 및 유해가스 제거 기술은 세계적으로 문제시되고 있는 환경오염 차원에서 필수적으로 요구되어지는 기술이라 할 수 있다. 이러한 고온고압의 시스템에서 사용될 수 있는 필터로 현재 세라믹이 가장 적절한 재질로 평가되고 있는데 이는 세라믹 자체가 지닌 열적 안정성 때문이라고 할 수 있다.(중략)

• Journal of Conservation Science
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• v.26 no.4
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• pp.429-436
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• 2010

Dyestuffs extracted from fifteen kinds of natural dyeing materials were researched on their antimicrobial performance against 3 kinds of bacteria and 2 kinds of fungi in order to develop conservation/storage materials of traditional and natural dyed papers. The three types of mordants were evaluated by using the same method and then mixed with the dyestuffs to research their antimicrobial performance. With those results, dyed paper was made by mixing mordants with 9 kinds of dyestuffs with excellent antimicrobial performance. Among the dyed papers, Cotinus coggygria, Coptis chinensis, Phellodendri amurense, Rhus javanica and Acer ginnala multiple mordant papers were found to have an antibacterial quality against fungi, while, in the insect repellent experiment using termites, Coptis chinensis and Phellodendri amurense dyed papers were found to have insect repellent qualities. Also, with regard to the research result about the affect of dyeing paper on other materials like metal, Coptis chinensis have relatively stable qualities. Also, the three types of dyeed paper by Cotinus coggygria, Coptis chinensis and Phellodendri amurense, were found to have a tendency to remove harmful gases. Not only can these dyed papers be used for making storage box for cultural properties to prevent various organic artifacts from bio-damaging, but they can also be utilized as functional finishing materials in various spaces.

• Journal of Conservation Science
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• v.30 no.2
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• pp.123-136
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• 2014

Considering that decision in conservation treatment for damaged objects should consider not only various options of methodology of intervention but also possible consequences of different types of intervention, it is a difficult task to decide and propose clear and safest solution of preserving an object. In addition, it should be constantly challenged by conservators even if it is proved technique or methodology in a past treatment. Therefore, there is no absolute solution which can be applied to all practice but each decision can be different case by case. It is not possible to estimate the way how the present condition of material and environmental aspects would affect to the condition of an object in future. However if conservators keep trying to set out various ways of analysing pro and against effect of past treatments, it would be able to provide useful logics of proving efficiency and appropriateness of a certain treatment. Understanding that the advantage of laser technique is to adopt a way of cleaning an object without making a direct contact, which is different from other techniques, this paper aims at securing stability of laser techniques, although it remains a limitation in the compatibility to all other materials. This study has examined reacting process on the painted pigments against laser beam by using CLSM in order for it to display both the problems from such reacting process and the efficiency of it as a cleaning methodology. It has intended to estimate the result of laser techniques and propose the range of applicability.