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저염도 음식물 쓰레기를 이용한 퇴비시여가 배추의 생육에 미치는 영향
전윤태,박길환,조경철,김희경,지연태,정순주 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
This study was conducted to investigate the changes of physico-chemical properties of soil applied with compost made by food wastes and its effect on the growth and yield of Chinese cabbage. Chinese cabbage was grown in the soil treated with food waste compst(FWC) of 0, 0.625, 1.25, 2.5, 5 and 10㎏/3.3㎡. As the amount of FWC increased, number of leaves, leaf area and fresh weight increased where application of 5㎏ and 10㎏/3.3㎡ showed vigorous plant growth in the late growing period. The pH of soil by application of FWC was not raised, which was similar to the soil before treatment. Organic matter increased in soil by increasing the amount of FWC. However, concentration of Cu and Pb in the soil reduced. The concentration of available phosphate(P) was lower in the soil treated with FWC than in the soil before treatment, which means that a large amount of P may be uptaken by plant. This study suggested that FWC should be an alternative to chemical fertilizer for vegetable production.
Weight Training과 Plyometric Training이 순발력 향상에 미치는 효과
유승희,박연길 경희대학교 체육과학연구소 2000 體育學論文集 Vol.28 No.-
The purpose of this study was to analyse the effect of the 8weeks' weight training and plyometric training upon the development of power ability. The subjects for this study consisted of 30 high school students. Two groups for this study were divided, one was weight training group (N=15), the other plyometirc training group(N=15). In the Weight training program the subjects practiced a total 5 resistance exercises with the 60% maximal muscular strength including 3 minutes rest. Plyometirc training program consisted of single foot side-to-side, tuck jump heel kick, 1-2-3 drill, standing long jump with sprint, single leg hop and depth jump to prescribed height ankle hop The test items for this study were 50m dash, vertical jump and standing long jump. The pre and post records of 3 test items were compared at the 5% significance test to evaluate the effect of two training programs. The results were as followings. 1.There was no significant difference in the 50m running between the weight training group and the plyometric training group. 2.There was significant difference in the vertical jump between the weight training group and the plyometric training group(p〈.05). Plyometic trianing group marked higher records than weight training group. 3.There was no significant difference in the standing long jump between the weight training group and the plyometric training group.
Hierarchical Location Caching Scheme for Mobile Object Tracking in the Internet of Things
( Youn-hee Han ),( Hyun-kyo Lim ),( Joon-min Gil ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5
Mobility arises naturally in the Internet of Things networks, since the location of mobile objects, e.g., mobile agents, mobile software, mobile things, or users with wireless hardware, changes as they move. Tracking their current location is essential to mobile computing. To overcome the scalability problem, hierarchical architectures of location databases have been proposed. When location updates and lookups for mobile objects are localized, these architectures become effective. However, the network signaling costs and the execution number of database operations increase particularly when the scale of the architectures and the numbers of databases becomes large to accommodate a great number of objects. This disadvantage can be alleviated by a location caching scheme which exploits the spatial and temporal locality in location lookup. In this paper, we propose a hierarchical location caching scheme, which acclimates the existing location caching scheme to a hierarchical architecture of location databases. The performance analysis indicates that the adjustment of such thresholds has an impact on cost reduction in the proposed scheme.