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Vertically aligned cupric oxide nanorods for nitrogen monoxide gas detection
박종현,김효진 한국표면공학회 2023 한국표면공학회지 Vol.56 No.4
Utilizing low-dimensional structures of oxide semiconductors is a promising approach to fabricate relevant gas sensors by means of potential enhancement in surface-to-volume ratios of their sensing materials. In this work, vertically aligned cupric oxide (CuO) nanorods are successfully synthesized on a transparent glass substrate via seed-mediated hydrothermal synthesis method with the use of a CuO nanoparticle seed layer, which is formed by thermally oxidizing a sputtered Cu metal film. Structural and optical characterization by x-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy reveals the successful preparation of the CuO nanorods array of the single monoclinic tenorite crystalline phase. From gas sensing measurements for the nitrogen monoxide (NO) gas, the vertically aligned CuO nanorod array is observed to have a highly responsive sensitivity to NO gas at relatively low concentrations and operating temperatures, especially showing a high maximum sensitivity to NO at 200 ℃ and a low NO detection limit of 2 ppm in dry air. These results along with a facile fabrication process demonstrate that the CuO nanorods synthesized on a transparent glass substrate are very promising for low-cost and high-performance NO gas sensors.
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임진-한탄강 유역 출토 대형박편과 도구의 제작기술상 관계연구
박종현 한국구석기학회 2011 한국구석기학보 Vol.- No.23
The aim of this study is to understand the pattern of producing large flakes excavated on Imjin-Hantan River basin and relation between large flakes and large flake tools--tools made on large flakes--in terms of producing techniques. The large flakes, which can be utilized as blanks of large tools such as bifaces, have been excavated here and there on Imjin-Hantan River basin. Producing large flakes, stone knappers primarily employ cortex of quartzite raw material as striking platforms. They don't modify striking platforms of large cores before flaking large flakes, which they produce by utilizing anvil techniques and side blows as changing percussion direction. Principally interior platform angles of these large flakes are obtuse ones and bulbs are convex and prominent. Large flakes are chiefly produced on the first stage of reduction process. Ones whose width is longer than their length are produced more than those of which length is longer than their width. Comprehending the relation between large flakes and large flake tools in terms of producing techniques begins from whether they are length-long or width-long. Length-long large flakes are mainly produced for making large scrapers. When tools are made of length-long large flakes, parts retouched mostly are left and right edges. Furthermore, distal parts are retouched when making cleavers of the large flakes. Width-long large flakes are flaked to produce cleavers primarily. In this case, distal parts and left edges are retouched in the main. The techniques of making tools on large flakes let the stone knappers produce tools more easily than those of manufacturing tools from cobble raw material. They undertake a part of producing large tools on Imjin-Hantan River basin.
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무인항공측량시스템을 이용한 직접측량 방식의 지적재조사 대상 토지 추출 연구
박종현,홍성언 한국지적학회 2018 한국지적학회지 Vol.34 No.2
This study aims to propose a method to extract the collective cadastral non-coincidency lands that need cadastral re-survey project by applying field surveying method through experiments and analysis works using unmanned aerial vehicle(UAV). For the research, the area of research was selected and the digital orthophotos were produced by unmanned aerial vehicle. The produced digital orthophotos satisfied the error allowance stipulated by laws. According to the results of extracting the lands for cadastral re-survey by field surveying using the produced photos and cadastral materials. The lands of cadastral non-coincidency were 216 parcels, 11.2% of the 1,929 parcels in total. The coincidency lands were 1,713 parcels including 241 parcels of declination lands, which is 88.8% of the total. Based on the results of the experiment, it will be the most efficient to implement coordinate transformation by world geodetic system for the total 1,929 parcels in the first stage; conduct field surveying for the extracted 216 parcels of cadastral non-coincidency in the second stage; and correct the location of the 241 parcels of declination land among the coincidency lands by official authority according to relevant laws. 본 연구에서는 무인항공측량시스템을 이용한 실험 및 분석 작업을 통하여 직접측량 방식을 적용해 지적재조사사업을 하여야 하는 집단 불부합 토지를 추출하는 방안을 제시해 보고자 하였다. 이를 위해 연구지역을 선정하고, 무인항공측량을 하여 정사영상을 제작하였다. 제작된 정사영상은 법률에서 규정하고 있는 오차의 허용범위를 만족하였다. 제작된 영상과 지적 관련 자료를 이용해 직접측량 방식에 의한 지적재조사 대상 토지를 추출한 결과, 전체 1,929필지 중 11.2%인 216필지인 것으로 나타났다. 부합지는 편위지 241필지를 포함하여 88.8%인 1,713필지로 나타났다. 실험결과에 기초한다면, 1단계로 전체 1,929필지에 대한 세계측지계 좌표변환을 시행하고 2단계로 추출된 불부합지 216필지에 대하여는 직접측량 방식으로 추진하며, 부합지 중 편위지 241필지는 관련 법률에 따라 직권으로 위치정정을 하는 방식으로 접근하는 것이 사업 추진의 효율성을 극대화 할 수 있을 것으로 판단된다.
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