• 한국실내디자인학회논문집
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• 제14권1호
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• pp.91-99
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• 2005

The chief aim of this study is to prepare the rational alternative plan of the environmental friendly intoner design which can improve sick house syndrome of an apartment house and clarify future-development and the method proposal of use activation and point out the present problem depended to investigate development and the use actual condition of domestic environmental friendly interior materials related in-and-outside-the-country example on a foundation about the various precedence researches on environmental friendly interior materials. The study was witten at first the concept of the environmental interior design which leads environmental friendly charactenstics of material, a interior design, and construction, at the first in the conceptual definition of sick house syndrome. and then it was introduced the present condition of domestic environmental interior materials, interior design and construction and an environmental regulation and standard of in-and-outside-the-country In Conclusion, it may try to present comprehensive analysis and an expansive alternative plan.

• 한국식품위생안전성학회지
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• 제30권2호
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• pp.166-172
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• 2015

본 연구는 강산성차아염소산수(SAHW)와 초음파(UW)를 병용한 조미오징어 반가공품의 미생물 오염도 저감 기술을 개발하고자 수행되었다. SAHW의 유효염소농도는 $69.67{\pm}0.58ppm$, ORP는 $1071.33{\pm}4.16mV$, pH는 $2.79{\pm}0.05$이었다. 오징어 반가공품을 중량대비 20배의 SHS에 120분간 침지하였을 때 일반세균은 1.49 log CFU/g, 황색포도상구균은 1.32 log CFU/g 감소하였으며, 대장균은 검출한계 이하로 감소하였다. 오징어 반가공품 중량대비 10배의 SAHW에 120분간 침지한 경우, 일반세균은 2.69 log CFU/g, 황색포도상구균은 1.74 log CFU/g 감소하였으며, 20배의 SAHW에 120분간 침지한 경우, 일반세균은 3.62 log lCFU/g, 황색포도상구균은 3.22 log CFU/g 감소하였으며, 대장균은 검출되지 않아 SAHW가 같은 유효염소농도의 SHS보다 살균력이 높은 것을 알 수 있었다. SAHW 단독 처리만으로는 만족할 만한 미생물 저감효과를 얻을 수 없었기에 조미오징어 반가공품을 SAEW에 1차 침지 처리한 후, SAHW에 2차 침지 처리한 결과, 오징어 반가공품 중량 대비 20배의 SAEW로 60분 처리한 후, SAHW로 처리하였을 때는 중량대비 10배, 120분 처리, 중량대비 20배, 90분 처리로 일반세균수는 약 4.0 log CFU/g, 황색포도상구균은 규제치(log 2.0 CFU/g 이하) 이하로 감소하였으며 대장균은 검출되지 않았다. 초음파 세정기에 오징어 반가공품과 중량대비 20배의 TW, SHS, SAHW를 각각 넣어 UW 처리한 후 미생물 오염도를 조사한 결과, SAHW로 60분간 처리하였을 때 일반세균은 검출한계(< 1.00 log CFU/g) 이하로 감소하였으며 황색포도상구균은 규제치 이하로 감소하여 가장 좋은 저감효과를 나타내었다. 대장균의 경우, SAHW 10분간 처리로도 검출한계 이하로 감소하여 SAHW와 UW의 병용이 조미오징어 반가공품 미생물 저감화에 가장 효과가 좋은 것을 알 수 있었다.

• Steel and Composite Structures
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• 제42권1호
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• pp.91-106
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• 2022

Concrete-filled square stainless steel tubes (CFSSST), which possess relatively large flexural stiffness, high corrosion resistance and require simple joint configurations and low maintenance cost, have a great potential in constructional applications. Despite that the use of stainless steel may result in high initial cost compared to their conventional carbon steel counterparts, the whole-life cost of CFSSST is however considered to be lower, which offers a competitive choice in engineering practice. In this paper, a comprehensive experimental and numerical program on 24 CFSSST stub column specimens, including 3 austenitic and 3 duplex stainless steel square hollow section (SHS) stub columns and 9 austenitic and 9 duplex CFSSST stub columns, has been carried out. Finite element (FE) models were developed to be used in parametric analysis to investigate the influence of the tube thickness and concrete strength on the ultimate capacities more accurately. Comparisons of the experimental and numerical results with the predictions made by design guides ACI 318, ANSI/AISC 360, Eurocode 4 and GB 50936 have been performed. It was found that these design methods generally give conservative predictions to the ultimate capacities of CFSSST stub columns. Improved calculation methods, developed based on the Continuous Strength Method, have been proposed to provide more accurate estimations of the ultimate resistances of CFSSST stub columns. The suitability of these proposals has been validated by comparison with the test results, where a good agreement between the predictions and the test results have been achieved.

• 한국대기환경학회지
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• 제25권1호
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• pp.38-45
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• 2009

Since the seventies and the oil crisis, energy-saving measures have led to a reduction in the ventilation of room. The use of synthetic materials which emit various chemical substances had led to an increase in the concentration of indoor pollutants. "Sick building syndrome (SBS)" and "Sick house syndrome (SHS)" are worldwide problems. Also, the number of complaints about indoor air pollution caused by VOCs (Volatile organic compound) and HCHO (Formaldehyde) has increased. It is important that evaluating and understanding emission of indoor air pollutant from building materials. The object of this study was to evaluate emission test method for flooring such as wood based flooring, carpet tile, rubber tile, PVC sheet and tile, and to determine emission of TVOC and form-aldehyde. The quantity of TVOC and carbonyl compounds emission were sampled and measured by Tenax TA and gas chromatography/mass spectrometry (GC/MSD), 2,4-DNPH cartrige with ozone scrubber and high performance liquid from flooring. The TVOC concentration emitted from carpet tile was ($7.419\;mg/m^2 h$) the highest among 5 groups of test materials. In wood based flooring and PVC tile, the emitted concentration of toluene was high. And the dodecane emission was highest in carpet. The concentration of TVOC decreased by an increase in emission test period. After 7 days, the concentration of TVOC from floorings were about 50% below of the concentration at the first day. TVOC emission from wood based flooring, carpet tile, rubber tile, PVC sheet and tile were decreased in 28 days and remained steady after about 15 days. The concentration of formaldehyde emission from floorings showed extremely low.

• Korean Chemical Engineering Research
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• 제57권4호
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• pp.553-558
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• 2019

본 연구에서는 슬립캐스팅 성형법을 이용하여 실린더형 $MoSi_2$계 세라믹 서스셉터를 개발하여 고온 유도가열에 적용시켰다. $MoSi_2$계 소재는 SHS법(Self-propagating High-temperature Synthesis)으로 합성하였고 XRD 분석을 통해 합성된 상과 결정구조를 확인하였다. 합성된 소재로 실린더 성형체를 제작하기 위해 슬립캐스팅을 진행하였고 슬립의 고형분 함량 및 유지시간을 조절하여 실린더 성형체의 두께를 제어하였다. 최종적으로 성형체 소결을 통해 유도가열 발열체를 제작하였고 열처리과정 중 표면에 형성된 $SiO_2$층은 SEM/EDS 분석을 통해 확인하였다. 서스셉터로서의 가열성능을 평가하기 위해 유도가열기로 일정한 출력을 인가하였을 때 $(Mo,W)Si_2$ 실린더 서스셉터의 표면온도를 측정하여 출력 2 kW를 인가하였을 때 발열특성을 분석하였으며, 서스셉터 표면의 최고 온도는 $1457^{\circ}C$, 평균 승온속도는 $19^{\circ}C/s$로 우수한 가열 특성을 나타냈다.