• 자원리싸이클링
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• 제13권3호
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• pp.50-57
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• 2004

알루미늄 폐드로스는 알루미늄 용해업체에서 발생되는 주요 폐기물 중 하나인데, 주요 성분은 알루미나이며 상당량의 금속 알루미늄이 잔류한다. 알루미늄 폐드로스 내에 잔류하는 금속 알루미늄을 수산화나트륨 용액으로 침출, 분리시켜서 수산화알루미늄으로 제조하는 과정에서 침출잔사가 발생되는데, 침출 후 여과잔사의 주요 성분은 알루미나이다. 본 연구에서는 이 침출잔사를 세척, 건조, 배소하여 알루미나질 캐스타블 내화물과 같은 세라믹 원료로 재활용하는 연구를 수행하였으며, 상용화를 위한 파일롯트 플랜트시험을 수행하였다. 실증 생산라인은 년 간 1,000톤의 폐드로스를 처리하여 약 700톤의 세라믹 원료를 생산할 수 있는 규모이다. 생산라인의 시운전 결과, 개발 기술의 상용화 적용 가능성을 확인하였으며 상용화를 위해서 건조기의 개선과 Na, Fe등 불순 성분들이 시료에 유입되는 것을 줄여야 하는 문제점들을 파악할 수 있었다.

• Tribology and Lubricants
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• 제30권2호
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• pp.124-129
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• 2014

The piping system accounts for a large portion of the machinery structure of a plant, and is considered as a very important mechanical structure for plant safety. Accordingly, it is used in most energy plants in the nuclear, gas, and heavy chemical industries. In particular, the piping system for a nuclear plant is generally complicated and uses the reactor and its cooling system. The piping equipment is exposed to diverse loads such as weight, temperature, pressure, and seismic load from pipes and fluids, and is used to transfer steam, oil, and gas. In ultrasound infrared thermography, which is an active thermography technology, a 15-100 kHz ultrasound wave is applied to the subject, and the resulting heat from the defective parts is measured using a thermography camera. Because this technique can inspect a large area simultaneously and detect defects such as cracks and delamination in real time, it is used to detect defects in the new and renewable energy, car, and aerospace industries, and recently, in piping defect detection. In this study, ultrasound infrared thermography is used to detect information for the diagnosis of nuclear equipment and structures. Test specimens are prepared with piping materials for nuclear plants, and the optimally designed ultrasound horn and ultrasound vibration system is used to determine damages on nuclear plant piping and detect defects. Additionally, the detected images are used to improve the reliability of the surface and internal defect detection for nuclear piping materials, and their field applicability and reliability is verified.

• 한국자원식물학회지
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• 제8권3호
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• pp.247-252
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• 1995

양파 채종재배(採種載培)에 적합(適合)한 파종시기(播種時期)와 피복(被覆)을 구명(究明)코자 시험(試驗)하였던바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 생육(生育), 추태율(抽苔率), 개화율(開花率), 화경당(花莖當) 소화수(小花數) 및 임실율(稔實率)은 9월(月)10일(日)$\sim$ 25일(日) 파종(播種), 투명(透明) 비닐피복(被覆) 하(下)에서 가장 양호(良好) 하였다. 2. 주당(株當) 채종량(採種量) 및 10a당(當) 채종량(採種量) 역시(亦是) 9월(月)10일(日)$\sim$25일(日)에 투명(透明)비닐 피복하(被覆下)에서 증수(增收)여서 우리나라 남부지방(南部地方)에서는 양파모구(母球)를 9월(月)10일(日)$\sim$25일(日)에 투명(透明)비닐 피복하(被覆下)에서 파종(播種) 하는 것이 적합(適合)한 것으로 나타났다.

• 한국재료학회지
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• 제17권10호
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• pp.560-566
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• 2007

AlN plates were fabricated by hot pressing at $1700-1900^{\circ}C$ using yttria and alumina (3 and $10\;{\mu}m$ particle size) powders as additives and characterized: density, thermal conductivity, transverse rupture strength, and grain size measurement by SEM and EDS. Density values of $3.31-3.34\;g/cm^3$ are largely attributed to hot pressing of powder mixtures in carbon mold under $N_2$ atmosphere which caused effective degree of oxygen removal from yttrium-aluminate phase expected to form at $1100^{\circ}C$. The grain size of hot pressed AlN was almost homogeneous, with size approximately from 3.2 to $4.0\;{\mu}m$ after hot pressing. $Al_2O_3$ powder of $3\;{\mu}m$ particle size resulted in better transverse rupture strength and finer grain size compared to $10\;{\mu}m$ $Al_2O_3$ powder. The thermal conductivity of AlN ranged between $83-92.7\;W/m{\cdot}K$ and decreased with $Al_2O_3$ addition. Fine grain size is preferred for better mechanical properties and thermal conductivity.

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2008년도 춘계학술발표회
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• pp.244-245
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• 2008

• 한국약용작물학회지
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• 제14권2호
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• pp.87-91
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• 2006

An efficient plant regeneration of C. asiatica was achieved from organogenesis using petiole explants of in vitro plantlet on MS basal medium controled with different plant growth regulators (NAA,2,4-D, IAA kinetin, and BA). Best results that 50%, efficiency of regeneration per explant for regeneration were obtained with IAA $17.13\;{\mu}M$ and BA $8.9\;{\mu}M$. Formation of adventitious shoots via organogenesis from the petiole explant was verified by histological sectioning of plantlets. Regenerated plants were transplanted into soil.

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2008년도 추계학술발표회
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• pp.412-412
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• 2008

• 산업공학
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• 제4권2호
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• pp.67-72
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• 1991

CWM(Coal Water Mixture) is a mixed fuel that consists of coal, water and additives. The main advantages of CWM are reducing the oil consumption and the air pollution materials such as flyash, dirt, and $SO_x$. This paper presented a case study for the economic feasibility analysis of changing an existing coal-oil power plant to a CWM power plant. The economic analysis of changing a coal-oil power plant to a CWM power plant was based on the total annual incremental costs of two power plants. We found that this project was economically and environmentally acceptable.

• 한국연소학회지
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• 제20권1호
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• pp.1-5
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• 2015

Fire and explosion analysis are performed for the quantitative risk assessment on the LNG test plant. From the analysis for a case of fire due to large leakage of LNG from the tank, it is obtained that loss of lives can be occurred within the radius of 60 m from the fire origin. Specially, wind can extend the extent of damage. Because the LNG test plant is not enclosed, the explosion overpressure is less than 6 kPa and the explosion has little effect on the integrity of the LNG test plant.

• Preventive Nutrition and Food Science
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• 제8권2호
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• pp.200-218
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• 2003

Phenolic compounds in food and plant materials belong to the simple phenols, phenolic acids, coumarins, flavonoids, stilbenes, tannins, lignans and lignins, all of which are considered as secondary plant metabolites. These compounds may be synthesized by plants during normal development or in response to stress conditions. Phenolics are not distributed uniformly in plants. Insoluble phenolics are components of cell walls while soluble ones are present in vacuoles. A cursory account of phenolics of cereals, beans, pulses, fruits, vegetables and oilseeds is provided in this overview. The information on the bioavailability and absorption of plant phenolics remains fragmentary and diverse. Pharmacological potentials of food phenolics ave extensively evaluated. However, there are many challenges that must be overcome in order to fully understand both the function of phenolics in plant as well as their health effects.