• 자원리싸이클링
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• 제16권6호
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• pp.39-45
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• 2007

황동 전구 base 제조과정에서 발생하는 황산폐수에 함유된 구리와 아연의 농도를 저감시키기 위해 중화법에 의한 최적조건을 조사하였다. 구리와 아연이 함유된 황산용액에 대해 화학반응과 물질수지를 고려하여 용액의 pH에 따른 구리와 아연의 농도분포와 용해도를 구하였다. 구리와 아연의 수산화물이 침전되는 pH영역에서 아연의 용해도가 구리의 용해도보다 크므로, 구리에 비해 아연의 제거율이 용액의 pH에 민감하였다. 응집제로 $Al_2(SO_4)_3$를 첨가하는 경우 아연의 제거율은 응집제의 첨가형태에 영향을 받지 않았으나, 구리의 경우에는 용액으로 첨가하는 것이 고체상태로 첨가하는 것보다 제거율이 높았다.

• 한국산업융합학회 논문집
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• 제21권6호
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• pp.395-408
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• 2018

Even after the Fukushima nuclear accident in 2011, the rate of production of electric energy using nuclear energy is increasing, but there is a great danger such as the radioactive waste produced when using nuclear power, the catastrophic accident of nuclear power plant, and connection with nuclear weapons. In particular, Cs present in the ionic form of alkaline elements has a long half-life (30.17 years) because it is readily absorbed by the organism and emits intense gamma rays, thus presenting a serious radiation hazard. Therefore, it must be completely removed before it can be released into the natural ecosystem, because it can adversely affect not only humans but also natural ecosystems. Many adsorbents and ion exchangers which have high Cs removal efficiency have been used in recent years to completely separate and remove by self separation in water. Many adsorbents and ion exchangers which have high Cs removal efficiency have been used in recent years to completely separate and remove by self separation in water. In addition, researches have been doing to synthesize magnetic materials with adsorbents such as HCF and PB, and it shows a great effect in the removal rate of Cs present in wastewater or the maximum Cs adsorption amount. In particular, when a magnetic material was applied, excellent results were obtained in which only Cs was selectively removed from other cations. However, new problems such as applicability in the sea where Cs is directly released, applicability in various pH ranges, and failure to preserve the magnetizing force possessed by the magnetic body have been found. However, researches using ferromagnetic field with stronger magnetic properties than those of magnetic bodies is considered to be insufficient. Therefore, it is considered that if the researches combining the ferromagnetic field with the magnetization ability and functional adsorbents more actively, the radioactive material Cs which adversely affects the natural ecosystem can be effectively removed.

• 한국구조물진단유지관리공학회 논문집
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• 제26권6호
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• pp.120-127
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• 2022

질소산화물(NOx)은 대기오염의 주요 인자로 일산화질소와 이산화질소의 형태로 존재하며 인체에 유해하다. 최근 대기 중 NOx를 제거하기 위한 많은 연구가 진행되고 있으며, 이러한 노력은 건설재료 분야에서도 동일하다. NOx는 광촉매 반응을 이용하여 효율적으로 제거할 수 있는 것으로 알려져 있다. 본 연구에서는 활성탄(AC)과 이산화타이타늄(TiO₂)을 이용한 폼 복합재의 NOx 제거성능을 조사하였다. AC는 폼 복합체의 비표면적을 증가시켜 TiO₂의 광촉매 반응 효율을 향상시켰다. 본 연구에서는 AC의 혼합율을 주요 변수로 하여 폼 복합체를 제조하였다. 제조된 시험체를 이용하여 ISO-22197-1에 제시된 시험방법에 따라 NOx 제거성능을 평가하였다. 폼 복합체의 비표면적은 AC 함량에 따라 증가하는 경향을 나타내었으나 15% 이상에서는 감소하였다. 또한 AC 혼입률이 15%일 때 NOx 제거 효율이 가장 높았다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.647-652
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• 2002

In the previous study, authors presented the I-ProConS (Intelligent PREdiction system of CONcrete Strength) using artificial neural networks (ANN) that provides in-place strength information of the concrete to facilitate concrete form removal and scheduling for construction. The serious problem of the system has occured, which it cannot appropriately predict the concrete strength when the curing temperature of a curing day is changed. This is because it uses the single neural networks, which all nodes are fully connected, and thus it cannot smoothly respond for external impact. However this paper presents that the problem can be solved by multiple neural networks, which is composed of five ANNs.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1993년도 학술논문발표회 논문집 제12권 1호
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• pp.121-124
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• 1993

This paper is a study on the word recognition using neural network. A limited vocabulary, speaker independent, isolated word recognition system has been built. This system recognizes isolated word without performing segmentation, phoneme identification, or dynamic time wrapping. It needs a static pattern approach to recognize a spatio-temporal pattern. The preprocessing only includes preceding and tailing silence removal, and word length determination. A LPC analysis is performed on each of 24 equally spaced frames. The PARCOR coefficients plus 3 other features from each frame is extracted. In order to simplify a structure of neural network, we composed binary code form to decrease output nodes.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권3호
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• pp.448-453
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• 1996

This is case report of florid osseous dysplasia occurred in the entire maxilla and mandible of 47-year-old female. Florid osseous dysplasia is an expansile, exuberant asymptomatic form of benign fibro-osseous disease of the periodontal ligament, often associated with jaw cysts and to be though as an abnormal reaction of bone to irritation or stimulation. The treatment was performed with removal of the necrotic bone, bone curretage and hyperbaric oxygen therapy. The patient did not well postoperatively and has shown sign of persistant infection with pus discharge.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.683-686
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• 1995

The automatic solid reconstruction is one of the important problems in CAD. Nowadays solid reconstruction has been done many areas, we will proposed this algorithm contribute to that development. this paper presents the algorithm to automatically reconstruct the soild form a set of the orthogonalal three views.

• Journal of Chest Surgery
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• 제24권8호
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• pp.814-818
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• 1991

Infection with the ubiquitous fungus Aspergillus is uncommon. This organism has a low pathogenicity for man. In most patients, pulmonary Aspergilloma is the most common form of disease, and Aspergillus fumigatus is the common species. The natural history of the pulmonary aspergilloma is variable. This report reviews the feature of growing pulmonary aspergilloma for 10 years[from diameter 3cm to diameter 9cm]. This 44-year-old male patient suffered from recurrent hemoptysis for 10 years. This patient was taken removal of aspergilloma and cavernoplasty of left upper lobe. Post-operation course was uneventful.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2003년도 추계학술대회 논문집
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• pp.402-402
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• 2003

대기오염은 최근 야기된 문제가 아니고 인류가 화석연료를 사용하면서 발생되었으며, 산업발달 과정에서 대기오염에 의한 많은 대형재해가 발생하였다. 최근에는 대기오염이 국지적인 문제가 아니라 국가 간의 심각한 사회적 문제로 대두되면서 대기오염 물질에 대한 법적 규제치는 급속도로 강화되고 있으며, 농도규제에서 총량규제로 전환되고 있는 과정에 있다. (중략)

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.556-556
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• 2001

The application of the laser to the tooth hard tissue started from the removal of carious dentin with the laser performed by Goldman in 1964. With the development of the laser technology, the laser treatment with less descomfort such as pain, vibration, and noise, etc. has been attempted. Since it is difficult to give a suitable form for inlay restoration to a cavity prepared with laser, it has to be restored with adhesive resinous materials. However, various evaluation of adhesive properties of the resinous materials to lased tooth surface on the various conditions such as adgerent, irradiation condition, procedure of bond test, and adhesive materials used, etc. have been reported.(omitted)