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박성제,김종원,Park, Seong-Je,Kim, Jong-Weon 한국산업정보학회 2012 한국산업정보학회논문지 Vol.17 No.7
웹 접근성에 대한 관심의 증가와 필요성 인식으로 인해 현재까지 다양한 접근성 지침과 자동화 평가도구들이 개발되었으나, 많은 선행연구에서 지침과 평가도구에 대한 문제점을 지적하고 있다. 이에 본 연구에서는 웹 표준에 착안하여 프레임 콘텐츠에 대한 웹 접근성 평가모형을 제시 및 검증하였다. 이를 위하여 프레임 콘텐츠에 대한 정의를 바탕으로 웹 표준기술요소를 정리하였으며, XHTML 및 CSS 기반의 프레임 콘텐츠 접근성 평가 모형을 제시하고 그 타당성을 검증하였다. Due to increase of interest in web accessibility and recognition of its necessity, a variety of accessibility indicators and automatic assessment tools have been developed, but previous literature indicated various problems about these indicators and tools. Thus, this research proposes and verifies the assessment model for accessibility of a frame content by considering web standards which develop the same web page for every client environment.
국제 물거래 대비 가상수 거래량 산정 : 한국 중심 국제교역량 분석
박성제,이민현,박계영,신지혜,Park, Sungje,Lee, Minhyeon,Park, Kyeyoung,Shin, Jihye 한국수자원학회 2020 한국수자원학회논문집 Vol.53 No.9
South Korea's available water resources per capita is very small compared to global average as there is a high population on small land. Thus, it is imperative to secure water resources for the safe livelihood of the citizens. As an advanced, industrialized country, South Korean economic dependence on agricultural has greatly lowered. Unless South Korea utilizes foreign water resources, it is impossible to provide agricultural and livestock products the same as current levels. However, virtual water-related research in South Korea is still inadequate. When establishing the water resources plan, it does not consider the international trade of virtual water. This research aims to solve this issue by analyzing the international virtual water trends focusing on South Korea. Consequently, the export and import of virtual water trade was identified according to country and item for 248 countries and South Korea. According to the results, South Korea's agricultural and livestock virtual water has much higher imports than exports, which outputs with agricultural by-products being the main import. In 2018, South Korea imported 72.2 billion ㎥, which is 29 times the exported amount of 2.5 billion ㎥. The research results can be used as baseline data for establishing the national water resources plan in the future.
스터링 냉동기의 주파수 특성에 의한 성능평가에 관한 연구
박성제,홍용주,김효봉,고득용,오군섭,김종학,Park, Seong-Je,Hong, Yong-Ju,Kim, Hyo-Bong,Go, Deuk-Yong,Go, Gun-Seop,Kim, Jong-Hak 한국기계연구원 2000 硏究論文集 Vol.30 No.-
A free piston and free displacer(FPFD) Stirling cryocooler for cooling infrared and cryo-sensors is currently under development at KIMM(Korea Institute of Machinery & Materials). A Stirling cryocooler is relatively compact, reliable, commercially available, and uses helium as a working fluid. The FPFD stirling cryocooler consists of two compressor pistons driven by linear motors which makes pressure waves and a pneumatically driven displacer piston with regenerator. The FPFD Stirling cryocooler employs 1) the Stirling cycle for refrigeration, 2) linear for driving the cryocooler, 3) spring and gas support systems, and 4) fine gap for clearance seals. It is the most suitable design for a mechanical cryocooler utilized in night vision environment. In order to get optimum operating frequency, natural frequency of piston and displacer, optimum phase angle between piston and displacer, cooling capacity, performance tests of the Stirling cryocooler by the frequency characteristics were performed.