• Journal of Conservation Science
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• v.25 no.4
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• pp.399-409
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• 2009

Outdoor iron artefacts are easily corroded by affection of environmental pollutants directly. Especially they need to be removed $Cl^-$ ions, but outdoor iron artefacts are excluded for desalination owing to their special features. Therefore this study contains the conservation processes of an iron stele of the Joseon Dynasty as the sample as well as desalination experiments that were carried out the desalting method using spill pads and the immersion desalting method together in order to compare. Desalting methods were compared by analyses such as an optical and metallurgical microscope, SEM-EDS, pH meter, Ion Chromatography and X-ray diffraction. As a result of the analysis, the optical and metallurgical microscopy show that the corrosion products are constituted by the layers and the metallurgical microstructure is a white cast iron. The SEM-EDS results of corrosion products detected mainly Fe, O, and especially Cl upto 2.48wt%. The results of pH and anion analysis for the washing solution, the desalting method using spill pads shows the similar effect to the immersion desalting method. As a result of XRD analysis before and after desalting corrosion products, goethite, magnetite, lepidocrocite and akaganeite are detected before desalting, but akaganeite is not detected after desalting at the desalting methode using spill pads, which indicates to have an effect on desalination. Therefore the results show that the desalting method using spill pads has an effect on desalination similar to the immersing desalting method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3442-3447
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• 2014

A simple method to evaluate the hygroscopic characteristics of polymer of microelectronic plastic package is suggested. To evaluate the characteristics, specimens were prepared, and the internally absorbed moisture masses were measured as a function of the absorbing time and calculated numerically. The hygroscopic pressure ratio was calculated by heat transfer analysis supported by commercial FEM code because the hygroscopic diffusion equation has the same form as the heat transfer equation. The moisture masses were then summed by the self developed code. The nonconductive polymers had quite different characteristics for the different lots, even though they were the same products. The absorbed moisture mass variations were calculated for several different characteristics, and the optimal curve of the mass variation close to experimental data was selected, whose solubility and diffusivity were affected by the hygroscopic characteristics of the material. The method can be useful in the industrial fields to quickly characterize the polymer material of the semiconductor package because the fast correspondence is normally required in industry. The weight changes in the aluminum-nonconductive-polymer joint due to moisture absorption were measured. The deformed system was also measured using the Moire Interferometry system and compared with the results of finite element analysis.

• Journal of Conservation Science
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• v.25 no.1
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• pp.49-60
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• 2009

Outdoor iron artefacts are easily corroded by salts, especially $Cl^-$ion, from environmental pollutants and acid rain because of their location, so that they need conservational treatments such as stabilization. However the conservation of outdoor iron artefacts are limited to be consolidated for the present and there are a few the studies for the desalinization. The general desalinization method is that objects are immersed in reagent such as alkaline corrosion inhibiting solutions targeting on buried iron artefacts, thus they are not available for outdoor iron artefacts. In this study, concerning those difficulties, the different desalting method is experimented that materials soaked in alkaline solutions attach to objects and they are packed by waterproof to avoid evaporation. This paper experiment burial iron artefacts at first in order to fine out an adaptable method for outdoor iron artefacts. The soaking materials are Korean traditional paper, gauze, cotton wipers, spill pads and the desalting regent is NaOH 0.1M. Additionally the exiting desalinization method which is to immerse objects in solution is performed to compare. The analyses are microscopes, SEM-EDS, X-ray diffraction, pH meter and Ion chromatography. The result is that spill pads show the best desalting effect out of other materials similar to immersing desalting method.

• Journal of Korea Society of Industrial Information Systems
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• v.28 no.6
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• pp.107-113
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• 2023

In the field of ammunition, storage performance is recognized as important, and the moisture-proof performance of packaging containers is very important. In the ammunition field, paper cans with a multi-layered structure are mainly used as packaging containers. It is made by layering materials that play various roles. These packaging containers are mainly evaluated for moisture-proof performance according to the Korean Industrial Standard KS T 1314. The moisture permeability is determined through linear regression analysis of the change in weight of the moisture absorbent added inside. In this study, the effect of the amount of desiccant added on the moisture permeability test results of packaging containers was confirmed. It is considered appropriate that the amount of desiccant used in testing ammunition packaging containers be approximately 70% or more of the internal volume.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.109-109
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• 2019

2018년 5월 전라북도 남원군에서 재배하여 수확 후 $0^{\circ}C$ 저장고에서 예냉을 마친 산마늘을 사용하였으며 외 포장 상자는 골판지로 구성된 통기공이 없는 골판지상자 1kg용을 사용하였다. 골판지상자와 함께 내부 포장으로 사용하기 위한 내포장 필름은 $20{\mu}m$ 두께의 HDPE으로 된 필름 봉지, 흡습종이는 파라핀왁스 코팅 종이($32{\times}35cm$, 태영산업)를 이용하여 조합 처리하고 국내에서 개발한 기능성 필름2종으로 포장처리는 총 4가지로 (1) PE(관행) (2) PE+흡습지 (3) 기능성필름1($30{\times}58cm$, 기능성물질 1%+40,000OTR, 제조사: 신영산업사) (4) 기능성필름2($30{\times}58cm$, Key fresh, 제조사: 씨앤케이프로팩(주)) 각 처리당 1kg 씩의 산마늘 잎을 포장하였다. 실험은 포장 처리 후 상온상태로 전북 완주군 실험실까지 수송하였으며 실험실 도착 후 상온 실험실에 두고 2일과 6일 후 중량감소율, 색도, 엽록소, 손실률 및 종합선도 등 품질특성 변화를 조사하였고 각 포장방법별 온도와 상대습도 변화를 보기 위하여 산마늘 잎이 포장된 상자 내부 중앙 부분에 디지털온습도기록계(SP-2000-20R)를 고정한 후 측정하였다. 대조구로 사용한 PE필름 단용으로 포장한 산마늘 잎은 상온저장 6일 경과 후 중량 소율이 1.7%, PE필름+신선지 처리는 1.0%, 기능성필름1과 기능성필름2는 거의 중량감소가 없어 1% 미만의 변화를 보였다. 산마늘 잎의 SPAD 값에 의한 엽록소 수치와 색도를 측정한 명도($L^*$)와 Hue angle 값의 변화는 기능성필름1과 기능성필름2가 유사하게 높게 유지되었고 반면에 PE필름은 저장 2일 후 부터 값이 감소하기 시작하여 6일 후 크게 감소하였다. 저장 6일 후 기능성필름1과 기능성필름2가 외관품위에서 높은 평가를 받아 상품성을 유지하고 있었으나 PE필름 처리와 PE필름+흡습지 처리는 상품성을 상실한 상태였다. 이러한 경향은 건전율에 있어서도 유사하였으며 기능성필름1(다공성 나노 물질이 혼입되어 있으며 산소투과율을 $40,000cc/m2{\cdot}day{\cdot}atm$으로 조성한 필름)이 상온저장 6일 후 상품성을 유지하는 건전율이 83%로 가장 높았다.

• 전자공학회논문지 IE
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• v.43 no.3
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• pp.1-5
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• 2006

[ $CaZrO_3$ ] humidity sensors were prepared using the solid-state synthetic method and their humidity sensitive characteristics have been investigated. It was found that the impedance of the humidity sensors decreased with increasing relative humidity and the humidity sensitivity depended on the applied frequencies. The sensitivity of sensor is stable with heat treatment and a negligible hysteresis under cyclic humidity changes is shown, and the activation energy for electrical conduction is reduced with water adsorption.

• The Korean Journal of Mycology
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• v.40 no.4
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• pp.215-223
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• 2012

This study was aimed to find factors responsible for export potential of oyster mushroom through postharvest treatments including high pressure $CO_2$ and anti-moisture pad. Temperature fluctuation during export simulation induced the condensation of excess moisture resulting in the quality loss due to browning and decay. Anti-moisture pad was effective on inhibition of browning occurrence in part. High temperature exposure ($15^{\circ}C$) as retail simulation greatly offset the positive effect of anti-moisture pad. Short term treatment of high pressure $CO_2$ delayed the surface color changes as hunter L, a, and b values. There was no consistent tendency in total sugar and phenolics between treatments. In general, the export potential of small size mush-room (export size) at harvest was higher than large ones (domestic size). The major factors asso-ciated with the quality decrease of oyster mushroom during export were moisture condensation in packages and temperature fluctuation. Further research is required to improve mushroom export procedures.

• Korean Journal of Food Science and Technology
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• v.22 no.4
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• pp.473-478
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• 1990

A computer-aided simulation technique was selected to predict the gain or loss of moisture in corn starch packaged with gas and moisture permeable materials under various conditions. Water activity and moisture content of corn starch was predicted by computer program at various conditions. A linear relationship was showed between water activity and equilibrium moisture content at the range of $A_w$ 0.332 to 0.90 and simulated values obtained by the proposed model was given to a dose approximation with the observed values.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.111-117
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• 2017

This study examined the material properties of Korean rice husk ash (RHA) according to the manufacturing process, and evaluated the feasibility of its use as a new admixture for high strength concrete. For this purpose, its particle size distribution, chemical composition, and microstructure were analyzed under various parameters, such as calcination temperature ($400^{\circ}C$, $650^{\circ}C$, and $900^{\circ}C$) and the inclusion of a milling process. X-ray fluorescence analysis confirmed that the silicon oxide ($SiO_2$) content of RHA was improved to more than 92% with a calcination process at $650^{\circ}C$ or higher. In addition, microstructural analysis showed that the RHA calcined at $650^{\circ}C$ has a porous structure. Because of this, the absorption capacity of the RHA was improved. On the other hand, when the milling process was applied, the porous structure was destroyed; thus, the absorption capacity tended to decrease further. Based on the analysis results, it was concluded that RHA calcined at $650^{\circ}C$ can be used as an admixture for high strength concrete, which possesses functions of both a shrinkage reducing agent and a pozzolanic activator.

• 전기의세계
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• v.20 no.2
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• pp.27-31
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• 1971

Using insulating paper (cellophan), we measured the influences of moisture abosrbed for electrical properties i.e. V.I curves which result in deteriorating due to the moisture alsorbed is related to electrical properties Considerally due to the electrolytic effects of moisture involved cellulose Gel structure, we obtained also an evaluation method of deterioration rate Caused by the moisture absorbed in insulating papers.