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최현철 한국일어일문학회 1999 日語日文學硏究 Vol.34 No.1
外來語は原語から借用される際, 意味や音韻的な構造などが變化する. 本論文では, 韓日外來語の音韻的特徵を分析するために作成したデ一タべ一スをも とにして, 韓日外來語の音節數の變化とその要因, 音節の再構成の過程を定量的に分析した. 分析資料は, 韓國校閱記者會編「外來語辭典」(韓國校閱記者會,1987)と 日本放送協會編「日本語發音アクセント辭典」(日本放送出版協會,1985)に收錄されている, 英語を原語とする外來語(人名, 地名を除く)のうち, 韓日兩國語に共通して存在する單語を分析に用いた. その語數は395語である. まず, それぞれの言語における音節構造の違いから韓日外來語の音節數の變化をみると, 借用の際に, 英語の音節數に比べて韓日外來語の音節數は增加する傾向があり, かつ減少しないことが分かった. また, 韓日外來語の音節數增加の要因のうち, 英語の音節末子音, 子音連續·語末子音, 二重母音が主な要因として동いていることを確認した. さらに, この3つの要因による韓日兩國語の音節數變化を比較した結果, 各要因の影響がそれぞれ異なることが分かった. この3つの要因が韓日兩國語でそれぞれどのような相對的な重みを持っているかを明らかにするために, 韓國語, 日本語, それぞれについて判別分析を行った. その結果, 韓國語の場合は二重母音が最大の增加要因であり, 日本語の場合は子音連續·語末子音が最大の增加要因であることを確認した. 最後に, 音節の再構成の過程においては, 元の英單語と比べて韓日外來語の音節種類は減少し, 音節總數は增加しているということががかった. これは韓日兩國語の音節構造が英語に比して單純であることに起因していると思われる.
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Electrocatalytic oxidation of hydrazine at carbon nanotube supported PdPt nanoparticles
최현철 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Bimetallic PdPt nanoparticles were prepared using the chemical reduction method. The PdPt nanoparticles were successfully deposited on thiolated carbon nanotubes (CNTs) to form a CNT-PdPt nanocomposite as an electron mediator for the fabrication of a hydrazine sensor. A fabricated chemical sensor based on CNT-PdPt was found to exhibit better amperometric activity with respect to the hydrazine oxidation reaction than CNT-Pd, CNT-Pt, and commercial Pd/C and Pt/C catalysts. This sensor exhibited a linear range of 0.55 - 1,200 μM and a detection limit of 0.28 μM (S/N = 3) with a fast response time (within 5 s). Furthermore, the sensor could be used repeatedly for the consecutive detection of hydrazine with good reusability and storage stability. These properties demonstrate that the CNT-PdPt nanocomposite is a promising electron mediator for the fabrication of amperometric hydrazine sensors.
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최현철,정지한,이주엽 대한수부외과학회 2014 대한수부외과학회지 Vol.19 No.3
We report a 56-year-old female with symptomatic protrusion of the bony lesion in the trapezium. Excision and biopsy of the bony lesion revealed thickened and sclerotic bony trabecula with adjacent zone of fibrocartilage, which is compara- ble with melorheostosis. This lesion with unique radiologic and histologic find- ings may be important to differentiate with other bony lesions such as myositis ossifications and osteosarcoma. 유선상 과골증은 희귀한 경화성 골질환으로 수부에는 매우 드물게 발생한다. 저자들은 56세 여성의 좌측 대능형골에발생하여 증상을 유발한 유선상 과골증을 보고하고자 한다. 조직학적 검사상 두껍고 경화된 골주를 가지는 성숙골이 관찰되었으며, 환자는 수술 후 재발 소견이 없어 관찰 중이다. 이 병변은 특징적 방사선 소견 및 조직학적 소견을 통하여골화성 근염이나 골육종 등 다른 골 병변과의 감별이 필요하다.
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비선형 멤리스터 에뮬레이터와 선형 멤리스터 에뮬레이터의 특성비교
최현철,박세동,김용진,김형석 제어로봇시스템학회 2014 제어로봇시스템학회 각 지부별 자료집 Vol.2014 No.12
Implementation of a memristor emulator is very important since real memristors are not physically realizable with current technology. In this paper, two type of memristor emulator has been implemented and comparison of Nonlinear and Linear Memristor Emulator Characteristics has been Implemented.
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Simulation을 이용한 A-Frame System 작업자의 이동거리 연구
최현철,성상윤,양난규,정동명,장윤석 대한산업공학회 2015 대한산업공학회 춘계학술대회논문집 Vol.2015 No.4
Order picking process is the most time consuming activity in a warehouse which increases the warehousing cost. To address such inefficiency, a variety of automated systems have been developed. Among them, the A-Frame System is an automated order-picking equipment which is used in a warehouse to handle medical supplies and tobaccos. But in a replenishment area of A-Frame, the workers manually perform the task yet. In this reason, there’s a need for research to increase the utilization of workers. This paper analyzes the replenishment tasks by comparing a moving distance between a single-layer A-frame System and a multi-layer A-frame System. To compare the distance, we conduct simulation study considering operational environment and real world order information acquired at a tobacco warehouse.
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