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정희돈 대한기계학회 1994 大韓機械學會誌 Vol.34 No.1
AE는 여러 분야에서 응용되어 보다 가치높은 정보를 얻을 수 있는 기법이다. 금속재료를 위주로 했던 초기에 비해 요즈음은 신소재와 지하에너지의 개발 그리고 산업체에서의 생산성 향상을 위한 적용에까지 그의 응용 범위가 넓어져 가고 있음을 알 수 있다. 또한 AE는 고체 재료의 변형 및 파손에 관한 정보뿐만 아니라, 의료진단 수법으로서의 개발은 물론, 기체 및 액체에서 발생하는 각종 물리적 현상의 이해에도 응용될 수 있는 등, 앞으로도 그의 응용범위는 노력 여 하에 따라 더욱 넓어지고 종래의 평가 방법으로는 기대하기 어려웠던 많은 정보들을 제공하게 될 이다.
鄭凞敦,尹善柱,金秉烈 영남대학교 자원문제연구소 1992 資源問題硏究 Vol.11 No.-
This experiment was conducted to get the basic data for the optimum fruit harvesting time by investigation of the seasonal content changes caused by fruit growth pattern and days after anthesis in summer cucumber cultivars (Cucumis sativus L. cvs. , "Shinhukjiniu" and"Hukkwangjinju"). Fruit growth was rapidly increased as early as 8 days after anthesis for both cultivars. The growth rate in fruit length was gradually decreased to the blossom end than the upper part (peduncle) of the fruit, Chlorophyll content was maximum at 5 days after anthesis in "Shinhukjinju", whereas continuous increased upto 7 days in "Hukkwangjiniu". Fructose and glucose also observed maximum at 6 days after anthesis in "Shinhukjinju", but increased upto 7 days in "Hukkwangjinju". Sucrose have a tendency to decline through the fruit growth. Ascorbic acid content was decreased after anthesis. In weight loss during the storage, continuous decrease was observed in the earlier harvested fruits than the late ones when stored in room temperature, whereas least weight loss rate was observed in harvested fruit at 7 days after anthesis when stored at 6t, In both cultivars, the best fruit quality was obtained when harvested at 7 days after anthesis.
盧在洙,鄭熙敦 嶺南大學校 環境問題硏究所 1989 環境硏究 Vol.8 No.2
Studies were made to inverstigate on the accumlation and distribution of heavy metals in soils and in native plants of the Gum Ho River. The content of heavy metals in soils and in plants showed the markedly difference according to the areas. In the branch streams heavy metals were much more accumulated in soils than in the main stream. The Dal So and the Shin Chon branch rivers showed particularly higher concentration than the other ones. The content of heavy metals was increased when the sampling areas are changed from the upper spot of the Gum Ho River(Mul Ti Mi area) to the down stream (Ha Bin). And the Shin Chon river is the diverging point of the heavy metal content. The distribution of heavy metals in plants was varied in accordance with the species regardless of the sites. Lentopodium lentopodioides contained the highest level of heavy metal components. There was no significant correlation between the heavy metal contents in soils and in plants except Erigeron canadensis. The correlation coefficient of Cu(r= 0.09) revealed a positive corellation in Erigeron canadensis. In soils, the Pb content was higher than the Cr. but the it was reversed in plants.
허리보호대 착용에 따른 하지와 허리의 근 활성도및 각도 비교에 관한 연구
정희돈,이주상,유영열 대한치료과학회 2018 대한치료과학회지 Vol.10 No.1
Objective: The objective of this study was to examine whether there are differences in low back and lower extremity muscle activity between when a back belt is worn and when no waist protection band is worn while moving patients. Method: This study was conducted on 50 physical therapists who were working in areas where patients should be moved in C Hospital in located in Gyeonggi-do. The physical therapists were randomly divided into two groups of 25 persons each and the groups moved patients from their wheel chairs to tables wearing a back belt and without wearing any back belt respectively. The muscle activities of the trunks and lower extremities of the subjects were measured using electromyographs while the subjects were moving patients and the angles of their trunks and lower extremities were obtained through video taping and goniometers. Independent sample t-tests were conducted in order to examine differences between the two groups. Results: In the experiment, the group of those who were wearing a back belt and the group of those who were not wearing any back belt did not show any significant difference in muscle activity.(p>.05) However, the group of those who were wearing a back belt and the group of those who were not wearing any back belt showed significant differences in trunk and lower extremity angles.(p<.05) Conclusion: The results mean than back belt make proper postures by reducing lumbar bending angles and increasing knee bending angles when the subjects are moving patients.
鄭凞敦,尹善柱,金秉烈 영남대학교 자원문제연구소 1991 資源問題硏究 Vol.10 No.-
Leaf growh patterns were compared in the different head shaped chinese cabbages, “Bokdor”(ovata type) and “Cheongsan” (cylindrica type). Many more expanded leaves were observed in "Bokdori" as compared with the "Cheongsan". "Cheongsan" was much higher in head height, but "Bokdori" was bigger in head width. Although no difference was observed in trimmed head weight (except the wrapper leaves) between the varieties, each leaf fresh weight was heavier in "Cheongsan." We also observed the double peaks of maximum growth rate through the growing period. Leaf height, leaf width and midrib were similar growth patterns, however "Cheongsan's" growth rate was more rapid than "Bokdori". Leaf index (leaf length/leaf width was similar through the growing season in "Bokdori" , whereas continuously increased to the 35th leaf in "Cheongsan". "Cheongsan", sylindrica type, was observed very rapid growth rate in early growing period but rapidly decreased in late growing period compared with the "Bokdori" , ovata type.