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금속산화물 가스센서와 주성분분석을 이용한 홍로사과의 부패냄새 감응 평가
최일환,서정아,김선태 한국냄새환경학회 2017 실내환경 및 냄새 학회지 Vol.16 No.2
The changes in the aroma and spoilage odor emitted from eleven ‘Hongro’ apples during ten weeks’ storage were investigated using six types of metal oxide semiconductor gas sensor arrays. The gas sensors used in the evaluation were sensitive to apple-emitted aroma or spoilage odor, and a high reproducibility of 5% relative standard deviation or less was confirmed. Significantly, the change in apple-emitted aroma or spoilage odor was easily distinguished by the optimal gas sensor and a significant correlation (r=0.992) between decay rate and sensitivity change was observed. The results of a principal component analysis of the signal patterns obtained by data standardization using the optimal gas sensor showed a clear classification between decayed sampler groups and undecayed sampler groups.
大邱 北西地域의 砂岩 및 珪長岩에 發達하는 節理面의 地質工學的 性質에 對한 硏究
崔日煥 慶北大學校 自然科學大學 地質學科 地質學硏究會 1981 伏賢地質 Vol.- No.6
The Cretaceous sandstone and felsite distributed in north western border part of Daegu city are studied in viewpoint of engineering geology with an emphasis of development of joints. The probability of continuity of sandstone is 0.69 and that of felsite is 0.56. The rate of discontinuity of sandstone is 0.48 and that of felsite is 0.60. These values reflect that the rocks have been strongly jointed. k_o value of the sandstone is close to its k_a value and it is suggested for the sandstone have been in active state. On the other hand, k_o value of the felsite is close to its K_p value and it is also suggested for the felsite have been in passive state. Therefore in order to maintain the stability of these rocks. δ value should be changed to be less than 13.2, thus, the rocks are able to maintain its stability.
악취배출시설별 공기희석관능법의 희석배수와 악취센서 측정치의 상관성 분석
최일환,임봉빈,김선태 한국냄새환경학회 2016 실내환경 및 냄새 학회지 Vol.15 No.1
The correlation analysis between odor sensor and air dilution olfactometry method with odor emission facilities was performed for the real-time evaluation of odor emitted from the 13 facilities. The total correlation was less significant for all facilities due to various emission characteristics of odor. The correlation for the individual facility, however, showed a higher correlation coefficient (R=0.7371~0.9897). Especially, the strong correlation (above 0.9) was observed for the industry type with the odor characteristics like tobacco, styrofoam, acetic acid, and burning smell. The repeated odor measurements using the odor sensor showed good reproducibility with the mean relative standard deviation of 5.06%. The odor sensor could be useful tools for identifying and evaluating odor with an olfactometry in field, if the use and proofreading of the odor sensor are improved by a standardized method.