• Journal of Korea Far Infrared Association
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• s.18
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• pp.38-45
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• 2003

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.906-913
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• 2015

The red mud generated from the Bayer alumina production process seriously threatens the environment and human safety. Therefore, the reduction and recycling of red mud is an urgent topic in the aluminum industry. In this study, the effects of four parameters, ultrasound power, reaction temperature, time, and acid concentration, on the leaching of Fe, Al from red mud was investigated. The major parameters influencing the metal recovery efficiency from red mud were ultrasound power and reaction temperature. The use of ultrasonic irradiation resulted in 1.72 and 1.28 times higher recovery efficiency for Fe and Al, respectively. The proper conditions for the recovery of the metal components present in the red mud is the ultrasound intensity (150 W), sulfuric acid concentration (4-6N), reaction temperature ($70^{\circ}C$), and reaction time (2 hours), etc.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.673-676
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• 2017

The Offshore drilling system of domestic drilling systems (drill rigs, drill ship) in Korea is dependent on full imports and the monopolistic situation of a few foreign large corporations is intensifying. In addition, most of domestic technology development tries to develop single product oriented products until now, but it is necessary to develop monitoring control system for package unit commercialization by approaching package development method. Therefore, we will develop a control monitoring system that can integrate the single equipment of the mud system developed previously.

• The Journal of the Korea Contents Association
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• v.14 no.4
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• pp.389-396
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• 2014

This study was conducted as the basic research for the replacement of Blast Furnace Slag, Red Mud, Silica Fume, etc., with cement as a solution to the problems arising from the global warming caused by the generation of $CO_2$, and conducted the experimental review to examine the feasibility of matrix having properties identical to those of cement by using the Blast Furnace slag, Red mud, Silica fume, and alkali-activator. For this, by using the the inorganic binder, such as Blast Furnace Slag, Red Mud, Silica Fume, etc., and NaOH, $Na_2SiO_3$ and others as the cement substitute material, the strength characteristic according to the mixture time variation was performed in the tentative experiment. Based on the preceding experiment, this study performed the experiment to analyze the strength properties of hardener through the curing by air-dry temperature, curing by temperature in water, coating curing, and Korean paper curing. For the water curing at $80^{\circ}C$, the compressive strength and flexural strength were found to be the most excellent at the age of the 28th day, and furthermore, it was found that the non-cement hardener could be made, which is considered to affect the production of eco-friendly concrete.

• Journal of Korean Society of Environmental Engineers
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• v.34 no.12
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• pp.787-791
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• 2012

Characteristics of particle separation in water using labscale acoustic standing wave were studied. Acoustic standing wave is similar to either sound wave or ultrasonic, which makes a constant wave while returning to the origin by reflector. During that time, particulates dispersed in water are collected on the node of wave, where a sound pressure is zero. Acoustic standing wave transducer as of 28.0 kHz and 1.0 MHz were utilized and $6.8{\mu}m$ kaolin and $100.5{\mu}m$ redmud in average diameter were used as experimental materials in water. Once acoustic standing wave are generated in water, water temperature rises by $0.15{\sim}0.20^{\circ}C/min$ due to a sound pressure. Initial concentration of kaolin and redmud were controlled to have same as of 0.1, 0.2, 0.3, 0.4, 0.5 g/L, respectively. Removal efficiency of the turbidity in a reacting chamber after 5 minutes, when acoustic sound wave was formed in most distinct, was measured to have 18.2~56.2% for kaolin and 23.0~53.6% for redmud at 1.0 MHz. Particle separation was not observed at 28.0 kHz.

• Monthly Korean Chicken
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• s.126
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• pp.94-97
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• 2005

본격적인 겨울철로 접어드는 12월. 차가운 바람에 옷깃에 여미는 12월이지만, 충북 보령의 12월은 '천북 굴 축제'(2005.12.17~12.25)로 뜨거워진다. 내국인뿐만 아니라 세계인의 발길을 끌었던 대한민국 축제의 대명사 '보령 머드 축제'로 유명한 곳이지만 이날 만큼은 그 여름날의 열기를 잠시 잊은 채 겨울철 별미 '굴'의 맛 속으로 빠져보도록 하자.

• 주택과사람들
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• s.198
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• pp.22-23
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• 2006

최근 도심에 장기간 방치된 공장이나 가구단지 등을 헐고 대규모 복합단지로 조성하는 사례가 늘고 있다. 정부가 세제를 강화하고 주택 담보대출 한도를 축소함에 따라 청약 열기가 이전만 못해 건설사들이 지역 내 랜드마크로 통하는 매머드급 단지 조성에 올인을 선언하면서 부터다. 수도권은 물론 지방에까지 붐을 일으키고 있는 복합단지 조성의 이모저모를 살펴본다.

• Aerospace Industry
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• v.55
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• pp.44-55
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• 1997

항공기 제작업계는 세계 항공기 여객시장을 놓고 양분된 상태이다. 보잉이 미국의 또다른 여객기 제작사인 맥도널 더글러스사를 합병했고 이것을 EU가 승인함으로서 기정사실로 인정되어 세계 최대의 메머드 항공기 메이커로 자리매김이 된 상태이다. 이에 대하여 유럽의 에어버스사는 세계시장의 절반을 점유한다는 거창한 목표를 내걸고 전의를 불태우고 있다.

• Magazine of RCR
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• v.12 no.4
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• pp.34-39
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• 2017

• Magazine of the Korea Concrete Institute
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• v.28 no.6
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• pp.47-52
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• 2016