• Korean Chemical Engineering Research
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• v.51 no.2
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• pp.267-271
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• 2013

Test bed studies with highly efficient amine $CO_2$ solvent (KoSol-4) developed by KEPCO research institute were performed. For the first time in Korea, evaluation of post-combustion $CO_2$ capture technology to capture 2 ton $CO_2$/day from a slipstream of the flue gas from a coal-fired power station was performed. Also the analysis of solvent regeneration energy was conducted to suggest the reliable performance data of the KoSol-4 solvent. For this purpose, we have tested 5 campaigns changing the operating conditions of the solvent flow rate and the stripper pressure. The overall results of these campaigns showed that the $CO_2$ removal rate met the technical guideline ($CO_2$ removal rate: 90%) suggested by IEA-GHG and that the regeneration energy of the KoSol-4 showed about 3.0~3.2 GJ/$tCO_2$ which was, compared to that of the commercial solvent MEA (Monoethanolamine), about 25% reduction of regeneration energy. Based on these results, we could confirm the good performance of the KoSol-4 solvent and the $CO_2$ capture process developed by KEPCO research institute. And also it was expected that the cost of $CO_2$ avoided could be reduced drastically if the KoSol-4 is applied to the commercial scale $CO_2$ capture plant.

• Applied Chemistry for Engineering
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• v.27 no.4
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• pp.391-396
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• 2016

The absorption efficiency of amine $CO_2$ absorbent (KoSol-5) developed by KEPCO research institute was evaluated using a 0.1 MW test bed. The performance of post-combustion technology to capture two tons of $CO_2$ per day from a slipstream of the flue gas from a 500 MW coal-fired power station was first confirmed in Korea. Also the analysis of the absorbent regeneration energy was conducted to suggest the reliable data for the KoSol-5 absorbent performance. And we tested energy reduction effects by improving the absorption tower inter-cooling system. Overall results showed that the $CO_2$ removal rate met the technical guideline ($CO_2$ removal rate : 90%) suggested by IEA-GHG. Also the regeneration energy of the KoSol-5 showed about $3.05GJ/tonCO_2$ which was about 25% reduction in the regeneration energy compared to that of using the commercial absorbent MEA (Monoethanolamine). Based on current experiments, the KoSol-5 absorbent showed high efficiency for $CO_2$ capture. It is expected that the application of KoSol-5 to commercial scale $CO_2$ capture plants could dramatically reduce $CO_2$ capture costs.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.31 no.4
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• pp.22-32
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• 2013

This study aimed to reveal the establishment process and design concept of KoKwan park built in modern Busan, which is called three major park includes YongDuSan park and TaeJeong Park, by analyzing BusanIlbo published modern period in Busan and 'Busan' published modern Busan prefecture. In KoKwan, there was installed DuMoPo Waegwan. The Japanese residents built the cemetery and memorial stone for Tsunohe Heigo's sudden death in the KoKwan hill, who was an envoy dispatched by Tsusima prefecture, in order to enhance awareness of the old territory DuMoPo Waegwan. In 1916, the Japanese residents repaired ruined the place by rasing funds and donated to Busan prefecture. Busan prefecture went public this place as a park. Meanwhile, In order to commemorate the 50th anniversary of the opening of Busan port, Oike Chusuke's memorial statue was built in private house neiboring KoKwan park. He became the richest person in Busan while engaged in commerce and industry since he come to the Busan the year before the opening of Busan port. He donate garden site includes his statue and 10,000 Won for KoKwan park construction expenses to Busan prefecture Busan prefecture invite Oya Rejo, who was Osaka-Hu's landscape designer, to design the KoKwan park. He visited Busan and survey KoKwan park and other Busan's park and submitted the plan to Busan prefecture. His Plan for KoKwan includes shrine and Oike's statue, arboretum and greenhouses, children's play garden, etc. Oya's design concept of KoKwan park was analyzed as follows: the juxtaposition of the sacred and secular, the succession of present landscape context, the complement of parks content, the tool of nation-state formation. KoKwan park was completed with cost 20,000 won, insufficient budget compared with Oya's estimated amount. However, in this thesis, it was not cleared whether Busan prefecture built the park as it was. In 1945, after the independence, KoKwan Park was destroyed due to build Dong-gu Office, houses. The remained subjects from this study are to clarify the process the destruction of the park.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.04a
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• pp.54-54
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• 2006

• Korean Linguistics
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• v.76
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• pp.213-241
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• 2017

Korean verb 'Casi-', which is treated as negative element in dictionaries, is actually a placeholder shows indefinite use, and '-ko casiko' construction is understood as a member of a class of 'Ending repetition construction'. However, unlike among others, '-ko casiko' construction is now undergoing developement of its negative polarity. Because of its indefiniteness, '-ko casiko' construction change its meaning into a universal negative when it is used in negative sentences.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.21 no.3
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• pp.226-234
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• 2008

Background and Objective : Acne is very common skin disease encountered by dermatologists. But There is few reports on Acne treated with the Ko-Bang(古方) and the Sa-Am acupuncture. The study was designed to evaluate the effects of Acne patients by the Ko-Bang(古方) and the Sa-Am acupuncture. Methods : We conducted one patient with Acne seen at Won-Kwang University Ik-San Oriental Medical Hospital. We treated Acne by a herbal medicine, acupuncture, etc. Conclusions : We suggest that the oriental medical treatment and management have an effect with Acne which means Jwachang(挫瘡) in Oriental medicine.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.966-970
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• 2005

On the basis of the development of KSLV-1, KoDSat was designed and manufactured to demonstrate the performance of KSLV-1. KoDSat is exposed to a severe vibrational environment at launch. The structural reliability of KoDSat has to be verified using vibrational test. The structural compatibility and verification of components between analysis and test can be proved using environmental vibration test. In this paper, we review the structural characteristic of thruster control unit for a space launch vehicle and design TCU housing using mathematical model. In order to verify the structural compatibility and reliability, half-sine shock, random and sing sweep vibration test was performed. Especially, sing sweep vibration test result is compared with analysis result and mathematical model is verified.

• Annual Conference on Human and Language Technology
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• 2014.10a
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• pp.133-136
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• 2014

파이썬은 간결한 아름다움을 추구하는 동시에 강력한 스트링 연산이 가능한 언어다. KoNLPy는 그러한 특장점을 살려, 파이썬으로 한국어 정보처리를 할 수 있게 하는 패키지이다. 꼬꼬마, 한나눔, MeCab-ko 등 국내외에서 개발된 여러 형태소 분석기를 포함하고, 자연어처리에 필요한 각종 사전, 말뭉치, 도구 및 다양한 튜토리얼을 포함하여 누구나 손쉽게 한국어 분석을 할 수 있도록 만들었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.501-504
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• 2021

한국어 심층학습 언어모델인 KoBERT와, 확률적 기계학습 분류기인 나이브 베이즈와 로지스틱 회귀를 이용하여 유학생이 작성한 한국어 쓰기 답안지의 점수 구간을 예측하는 실험을 진행하였다. 네가지 주제('직업', '행복', '경제', '성공')를 다룬 답안지와 점수 레이블(A, B, C, D)로 쌍을 이룬 학습데이터 총 304건으로 다양한 자동분류 모델을 구축하여 7-겹 교차검증을 시행한 결과 KoBERT가 나이브 베이즈나 로지스틱 회귀보다 약간 우세한 성능을 보였다.

• Annual Conference on Human and Language Technology
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• 2021.10a
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• pp.203-208
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• 2021

본 논문에서는 맥락에 따라 개체명의 범주가 달라지는 어휘를 중심으로 교차 태깅된 개체명의 성능을 레이블과 스팬 정답률, 문장 성분과 문장 위치에 따른 정답률로 나누어 살펴 보았다. 레이블의 정확도는 KoGPT2, mBERT, KLUE-RoBERTa 순으로 정답률이 높아지는 양상을 보였다. 스팬 정답률에서는 mBERT가 KLUE-RoBERTa보다 근소하게 성능이 높았고 KoGPT2는 매우 낮은 정확도를 보였다. 다만, KoGPT2는 개체명이 문장의 끝에 위치할 때는 다른 모델과 비슷한 정도로 성능이 개선되는 결과를 보였다. 문장 종결 위치에서 인식기의 성능이 좋은 것은 실험에 사용된 말뭉치의 문장 성분이 서술어일 때 명사의 중첩이 적고 구문이 패턴화되어 있다는 특징과 KoGPT2가 decoder기반의 모델이기 때문으로 여겨지나 이에 대해서는 후속 연구가 필요하다.