• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1059-1062
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• 2021

투자에 대한 관심 증가에 따라 적은 비용과 시간으로 객관적인 정보 제공의 필요성 증가와 함께 인공지능 기술을 활용한 로보어드바이저 서비스가 확대되었다. 또한, 최근 ETF 를 통한 안정적인 투자에 대한 선호도가 증가함에 따라 ETF 중심의 AI 로보어드바이저 추천 서비스가 필요할 것으로 보인다. 하지만, 기존의 투자 어플리케이션에서는 뉴스 기반의 감성적인 요인이 반영되지 않은 추천 방식으로 주가에 영향을 미치는 다양한 요인들을 고려하지 못하는 문제점이 있다. 이에 본 연구에서는 뉴스의 감성분석을 통한 감성지수를 기반으로 새로운 주가 예측 모델을 제안하고, 사용자의 투자 성향 분석을 통한 맞춤 추천 서비스를 통해 개인화된 ETF 서비스를 제공한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.162-164
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• 2019

해양사고 발생이 잦거나 그 사고 여파가 매우 큰 위험물 운반선, 여객선 등 사고 취착선박의 경우 선내 장비 이상으로 인한 사고 또한 미연에 예방할 필요가 있다. 이에 항행 관련 사고를 미연에 예빙하기 위해서 선내시스템의 정보를 이용하여 선박의 이상 유무를 파악하는 기술을 개발했다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.119-120
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• 2022

지하수라는 수자원의 관리를 위해, 관련 데이터를 제공하여 정책 수립에 유용한 정보가 될 수 있도록 지하수 정보 제공 데이터베이스 시스템을 구축한다. 기초 데이터로는 지역별, 용도별, 연도별 지하수 이용 정보를 사용하였고, 또한 지하수 이용의 허가 신고현황과 전국 지하수 관련 업체 분포에 관한 자료를 활용했다. 이를 통해 허가 정보와 관련 업체의 수, 부담금의 액수, 연도별 경향성을 지하수 이용량과 연관지어 둘 사이의 관계를 알아보았다. 결과적으로 지하수 이용 부담금이나 관련 업체의 분포가 합리적이지 못하게 이루어지고 있음을 파악했다. 따라서 이 연구에서 구축한 데이터베이스 시스템이 정책적 보완에 기여할 수 있으리라 사료된다.

• Prospectives of Industrial Chemistry
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• v.17 no.3
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• pp.27-37
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• 2014

온실가스축적으로 인한 지구온난화를 비롯한 기후변화 및 고갈되어가는 석유를 비롯한 화석원료에 대한 문제를 해결하기 위해 재생가능한 자원으로부터 바이오기반 케미칼 및 고분자 등의 화학제품을 생산하는 바이오화학 공정이 많은 관심을 받고 있다. 본 기고문에서는 바이오화학공정에 핵심적인 촉매로 사용되고 있는 재조합 미생물 및 효소의 최근 개발동향을 내열성 엔지니어링 플라스틱인 바이오나일론의 생산을 위하여 개발되고 있는 바이오촉매를 중심으로 살펴보고자 한다.

• Journal of Energy Engineering
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• v.14 no.4 s.44
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• pp.219-225
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• 2005

for the removal of carbon dioxide in flue gas, which is the main cause of the global warming, chemical absorption methods were widely used for years. Alkanolamines such as MEA, AMP, MDEA are mainly used as an absorbent. In this study, cyclic amines - Piperazine, Piperidine and Cyclohelylamine are investigated to compare the chemical solubilities, absorption capacities and rate ot reaction. In conclusion, Piperazine is the most effective absorbent of $CO_2$ and ran be the excellent alternative to the former absorbents. Experiments were performed at 5, 10, 15 weight percent, 30, 40, $50^{\circ}C$, and the gas solubilities are determined by back-titration method, and using Gas Chromatography the absorption rate was compared.

• Korean Journal of Head & Neck Oncology
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• v.10 no.2
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• pp.178-184
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• 1994

Laryngeal cancer is one of the most frequent cancers in the head and neck area. Clinical analysis was performed on 30 cases of treated $T_1$ glottic cancer patients. Early glottic cancer occured most frequently in male in their sixties and all were well or moderately well differentiated squamous cell carcinoma. Overall five year survival rate was 81.5% and there was no significant difference between stages or the differentiation of the diseases. Recurrence at the primary site, especially anterior commissure, was common, thus careful pre- and postoperative follow up evaluation is recommended.

• Clean Technology
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• v.11 no.4
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• pp.189-194
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• 2005

Carboxymethylcellulose(CMC) which is water-soluble fiber was manufactured by mercerization and etherification in the earlier study. Experimental parameters were conversion time for each step, concentration of reagent and temperature. To know the presence of functional group, CMC was analyzed by FT-IR(Fourier Transform Infrared) spectroscopy. Ethanol was recovered using evaporator and purity of ethanol analyzed by GC-MASS was 97% and 83% after mercerization and etherification respectively. For the pilot plant, if CMC is folded by 40 times it showed maximum efficiency. Maximum solubility was obtained when the ratio of NaOH and MCA is 3 : 4.5.

• Journal of Conservation Science
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• v.32 no.2
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• pp.141-154
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• 2016

The gilt-bronze decorated bamboo mudguards with heavenly horse design excavated in 1973 at Cheonma Tomb of Shilla are the unprecedented relics in Korean history as it has its original structure. Although the bamboo mudguards were excavated in not only Cheonma Tomb, but also in Geumgwanchong and Geumryeongchong, all of them remains into pieces. In addition, there are no exact data related with its structure and manufacturing technique. The report deals with the manufacturing technique of the bamboo mudguards with heavenly horse design excavated in Cheonma Tomb through the naked eye's observation, X-Ray Fluorescence, and Transmission X-rays analysis etc. Bamboo mudguards basically have the three divided structure with central-focus structure of a radiation style. And the mudguards consists of Bratticing gilt-bronze, fabric, and bamboo plates together, as ornamental fringe of 4 plates. The surface of the gilt bronze plates was decorated with a variety of workmanship and pendant. Bamboo plates have a waved pattern by using about three hundred bamboo bark. Two types of textiles were mainly found in the textile plates, and the leather were partially found. In order to combine all plates together, gilt-bronze bottonhead, pendant decoration, and ornamental fringe were used. It would be helpful to study bamboo mudguards during 5th-6th centuries in Shilla period and basis investigations of Geumgwanchong and Geumryeongchong excavations.

• Journal of the Korea Concrete Institute
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• v.16 no.4 s.82
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• pp.557-564
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• 2004

This paper introduces a study carried out to investigate sodium sulfate attack caused by various reactive products. Experiments were performed on mortar and paste specimens made with ordinary Portland cement (OPC) conforming to KS L 5201 Type I. The water-cement ratios were varied from 0.35 to 0.55. It was found from the laboratory study that the water-cement ratio may be a key to control the deterioration of OPC matrix during sodium sulfate attack. Furthermore, X-ray diffraction (XRD) confirmed that ettringite, gypsum and thaumasite were the main products formed by sodium sulfate attack. These findings were well supported by thermal analysis through differential scanning calorimetry (DSC), and confirmed the long-term understanding that deterioration mechanism by sodium sulfate attack is a complicated process. Most importantly, deterioration due to sodium sulfate attack is characterized as the drastic reduction in compressive strength as well as the expansion (especially in cement matrix with a higher water-cement ratio).

• Journal of the Society of Naval Architects of Korea
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• v.44 no.2 s.152
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• pp.111-118
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• 2007

In order to investigate the noise characteristics of the different caviation, noise measurements were carried out in a large cavitation tunnel of the Samsuug Ship Model Basin(SSMB). The noise measurements for a 3-dimensional hydrofoil were carried out at the angle of attack of $12^{\circ}$ and $16^{\circ}$ according to the decrease in cavitation number. It is exhibited that sound pressure level(SPL) increased sharply with cavitation inception. The frequency of the noise induced by sheet cavitation was higher than that of tip vortex cavitation in the phase of cavitation inception. Within the range of the high frequency, in the case of fully developed cavitation, sheet cavitation noise was significantly increased in sound pressure level compared with tip vortex cavitation noise. In this study, the noise characteristics of the different cavitation types were considered experimentally and would be utilized as a basis for the analysis of propeller cavitation noise.