• Journal of the Korean Wood Science and Technology
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• 제24권4호
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• pp.93-99
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• 1996

In order to investigate the extent of fixation of new water-borne preservatives in blocks of pinus densiflora sapwoods the streaming potential through the column with preservative treated wood was measured at various conditions. The rates of leachability of ingredients in the treated wood were estimated by the measurement of electric conductivity of the solution with the leached components. The solution was also analyzed by Atomic absorption spectrophotometer (AA). As a results, the experimental data indicated that the fixation of CCB, CCFZ and ACQ in wood were relatively unstable. The fixation rates of CCB, CCFZ were improved by increasing heat and drying time. The amounts of the leached ingredients were apparently higher in CCB and CCFZ than in CCA, while the rate of leaching of ACQ was not changed at various drying temperature.

• BMB Reports
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• 제28권3호
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• pp.238-242
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• 1995

The tadpole H-ferritin produced in E. coli was purified and its molecular properties were investigated to obtain information about the contribution of the H-subunit in the reaction of iron core formation. All the expressed subunits were assembled into complete holoprotein in vitro, presumably 24-mer, and the protein was heat-stable. Electron microscopy revealed that the recombinant ferritin forms spherically and contains iron core. No difference was observed in the absorption spectrum of the expressed protein compared to that of the natural ferritin. The Ouchterlony double diffusion of the expressed protein showed that the H-chain ferritin shares an antigenic determinant with natural tadpole ferritin. Rabbit anti-horse spleen ferritin discriminated the H-ferritin from natural ferritin. The rate of ferritin formation by the recombinant H-chain apoferritin was determined to be higher than that shown by natural tadpole ferritin, which consists of H, M and L-subunits. This phenomenon may be caused by the absence of M and L-subunits in the recombinant H-chain apoferritin.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.565-570
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• 2001

Annually, Taiwan generates approximately 2 million tons of inorganic wastes in the form of sludge, fly ash and slug. To increase the added value of waste and maintain the increasingly insufficient supply of natural gravel, large public construction projects account for this large demand each year. future architectural trends are leading towards high-rise buildings. In light of the above, Center for Environmental, Safety and Health Technology Development, Industrial Technology Research Institute has developed the technology of manufacturing cold-bonding, sintering and bloating types of lightweight aggregates with a specific gravity ranging between 0.7~1.7, water absorption rate < 30%. The lightweight aggregate verified by physical property tests can be used as a substitute for the natural aggregate, which generally appears in replacing gravel in concrete, soundproofing and heat insulation materials. Doing so would not only moderate waste disposal problems, but also achieve the goal of resource recovery.

• 반도체디스플레이기술학회지
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• 제7권1호
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• pp.41-45
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• 2008

We studied the electrical characteristics of low-k SiOCR interlayer dielectric(ILD) films fabricated by plasma enhanced chemical vapor deposition (PECVD). The precursor bis-trimethylsilylmethane (BTMSM) was introduced into the reaction chamber with the various flow rates. The absorption intensities of Si-O-$CH_x$, bonding group and Si-$CH_x$, bonding group changed synchronously for the variation of precursor flow rate, but the intensity of Si-O-Si(C) responded asynchronously with the $CH_x$, combined bonds. The SiOCH films revealed ultra low dielectric constant around 2.1(1) and reduced further below 2.0 by heat treatments.

• 한국안전학회지
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• 제18권4호
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• pp.71-77
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• 2003

To inject fresh air into a fire room, Positive Pressure Ventilation (PPV) can be used and the blower of PPV increases inside pressure of the room. It makes high flow rate of products of combustion, smoke and heat from the structure, and it is very helpful to fireman on the fire extinguishing work. The flame moves to the direction of airflow and the temperature of flame can be decreased rapidly. In this experiment, a water mist system is applied to PPV to increase the effectiveness, and various effective factors are studied. n-Heptane and pine wood stick were used as fuel. Temperatures at the above and behind the combustion pan were strongly reduced by the water mist system and by the convective cooling with airflow. The smoke density was also decreased by PPV with water mist system and it can be explained by the absorption of smoke particles on the water mist droplet and by the strong exhausting effects of mobile fan.

• 한국잠사곤충학회지
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• 제41권3호
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• pp.205-210
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• 1999

Silk nonwoven fabrics are prepared by needle punching and thermal bonding with silk waste. To enhance the carding efficiency, the degumming rate was controlled with sodium hydrogen sulfite solution. The amount of the remained sericin was 3%(S-3), and 6%(S-6). Mixing wool and LMP(Low melting polyester) with the silk, to improve carding efficiency, was also effective. Following items were tested with prepared silk nonwovon fabrics : weight, thickness, compression, tensile strength, heat insulation, water absorption, and deodorization. The results show that the silk nonwoven fabrics could be used for apparels and new biomaterials.

• Journal of Welding and Joining
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• 제25권2호
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• pp.43-48
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• 2007

Laser Transmission Joining (LTJ) of plastics is a process in which light of suitable wavelength is transmitted through a transparent substrate that is in contact with an absorbing one. In this paper, LTJ is investigated by preliminary experiments from the viewpoint of mechanical engineering. To understand transmitting characteristics of each polymer substrate, transmission rate, reflection rate and absorption coefficient of polymer are measured by using a laser power-meter. Characteristics of joining in the spot welding and seam welding are investigated by measuring the fracture load. Fracture load increases in accordance to the laser power and irradiation time. However, when the laser power is over 60W and irradiation time over 4seconds, fracture load decreases. This phenomenon is probably due to heat-softening of materials. Besides, cavities are generated at a joint by evaporation of water molecules, which can be suppressed by introduction of a gap between two substrates.

• 자원리싸이클링
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• 제17권4호
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• pp.10-20
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• 2008

본 연구는 아직까지 활용실적이 적은 제지슬러지소각재를 대량으로 활용할 수 있는 방법을 도출하기 위하여 제지슬러지소각재를 시멘트의 대체재로 사용하고자 하였다. 또한 제지슬러지소각재 대체 시 나타나는 단점인 수화열 및 흡수율의 증가로 인한 수축균열을 폴리프로필렌섬유 및 셀룰로오스섬유를 혼입하여 이에 대한 제어효과를 고찰하여 제지슬러지소각재의 시멘트 대체재로써의 활용가능성을 규명하였다.

• 대한토목학회논문집
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• 제7권2호
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• pp.99-106
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• 1987

용접(鎔接) 강구조물(鋼構造物)의 피로균열성장거동(疲勞龜裂成長擧動)에 관(關)한 용접잔류응력(鎔擬殘留應力)의 거동(擧動)을 파악(把握)키 위하여 열처리(熱處理)를 실시(實施)하고 피로균열성장(疲勞龜裂成長) 및 검토(檢討)한 결과(結果) 용접부(鎔接部)는 경화(硬化)되어 늑성(勒性)이 감소(減少)되므로 소재부(素材部)보다 피로균열성장율(疲勞龜裂成長率)이 높았으며 이를 열처리(熱處理)한 결과(結果) 경도(硬度)나 저항력(抵抗力)이 증가(增加)되어 개선(改善)되었으며 $650^{\circ}C$ 정도(程度)에서 가장 이상적(理想的) 이었다. Elber 식(式)은 Paris-Erdogan 식(式)에 비(比)해 균열(龜裂)닫힘현상(現狀)을 고려(考廬)하므로 더 낮은 균열성장율(龜裂成長率)을 가지며 각(各) 열처리(熱處理)에 의한 곡선(曲線)들이 서로 비슷하므로 잔류응력(殘留應力)의 효과(効果)를 고려(考慮)할 수 없었다. 균열(龜裂)길이에 따른 개구하중(開口荷重)은 경도(硬度)가 높을수록 큰 값을 가지나 열처리(熱處理) 후(後)는 경도(硬度)값의 저하(低下)로 피로균열(疲勞龜裂) 성장율(成長率)이 낮아지며 흡수(吸收)에너지와 파괴늑성(破壞勒性)을 증대(增大)시켜 균열저지능력(龜裂沮止能力)을 가져 파괴(破壞)의 위험성(危險性)을 감소(減少)시킨다.

• 현장농수산연구지
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• 제26권1호
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• pp.16-21
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• 2024

본 연구는 해마다 수입을 많이 해오고 있는 콩과 녹비작물 종자의 발아율을 높이기 위해서 연구되었다. 열탕처리는 콩과 식물에서처럼 두꺼운 종피로 인해 휴면상태에 빠지는 종자의 발아율 향상 및 발아속도 증진을 위해 사용하는 방법이다. 클로버류와 자운영은 열탕처리가 무처리 보다 발아일수와 발아속도가 다소 높았다. 하지만 발아율과 발아세의 경우 무처리가 열탕처리보다 다소 높았지만 유의미한 차이를 보이지 않아 열탕처리가 발아율에 효과가 있다고 판단되지는 않는다. 네마장황의 경우 발아율과 발아속도를 높이는데 있어서는 염수선 처리가 가장 효과가 좋았고, 열탕처리는 초기 발아속도를 높일수는 있지만 발아율을 높이는데는 적합하지 않은 것으로 보였다. 헤어리베치의 경우 수입산 헤어리베치와 국내산 헤어리베치(토익과 청풍보라)에서 열탕처리와 염수선처리는 발아율에는 효과가 없었으나 발아세, 발아속도, 평균발아일수에는 다소 효과가 있다고 판단된다. 따라서 콩과 녹비작물과 같이 두꺼운 종피로 인하여 휴면상태에 빠지는 종자의 경우 발아율 향상과 발아속도를 향상시키기 위해 열탕처리나 염수선처리를 하는 것이 좋을것이라 사료된다.