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꿀벌의 사회생태시스템 분석을 통한 도시 양봉 활성화 녹지 계획 전략 제시
최호준,김민,전진형,Choi, Hojun,Kim, Min,Chon, Jinhyung 한국조경학회 2024 韓國造景學會誌 Vol.52 No.1
Pollinators are organisms that carry out the pollination process of plants and include Hymenoptera, Lepidoptera, Diptera, and Coleoptera. Among them, bees not only pollinate plants but also improve urban green spaces damaged by land use changes, providing a habitat and food for birds and insects. Today, however, the number of pollinating plants is decreasing due to issues such as early flowering due to climate change, fragmentation of green spaces due to urbanization, and pesticide use, which in turn leads to a decline in bee populations. The decline of bee populations directly translates into problems, such as reduced biodiversity in cities and decreased food production. Urban beekeeping has been proposed as a strategy to address the decline of bee populations. However, there is a problem asurban beekeeping strategies are proposed without considering the complex structure of the socio-ecological system consisting of bees foraging and pollination activities and are therefore unsustainable. Therefore, this study aims to analyze the socio-ecological system of honeybees, which are pollinators, structurally using system thinking and propose a green space planning strategy to revitalize urban beekeeping. For this study, previous studies that centered on the social and ecological system of bees in cities were collected and reviewed to establish the system area and derive the main variables for creating a causal loop diagram. Second, the ecological structure of bees' foraging and pollination activities and the structure of bees' ecological system in the city were analyzed, as was the social-ecological system structure of urban beekeeping by creating an individual causal loop diagram. Finally, the socio-ecological system structure of honey bees was analyzed from a holistic perspective through the creation of an integrated causal loop diagram. Citizen participation programs, local government investment, and the creation of urban parks and green spaces in idle spaces were suggestedas green space planning strategies to revitalize urban beekeeping. The results of this study differ from previous studies in that the ecological structure of bees and the social structure of urban beekeeping were analyzed from a holistic perspective using systems thinking to propose strategies, policy recommendations, and implications for introducing sustainable urban beekeeping.
IMT-2000 송신기 RF 시스템 설계 및 성능 분석
최호준,지만구,김학선 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-
In this paper, the RF system of IMT-2000 transmitter is designed and analyzed. We derived RF system requirements of minimum performance for IMT-2000 transmitter from analysis of test condition in 3GPP standard(3GPP TS 34.121(v.3.2.0)) and 3GPP2 standard (TIA/EIA/IS-98-C). Using RF system requirements of minimum performance, RF system of W-CDMA and cdma2000 transmitter is designed. Maximum and minimum output power test, spurious emission test, intermodulation test is simulated to a performance analysis. and then, we performed optimization on the parameter value of power amplifier that severely affect the system performance. Simulation results for W-CDMA and cdma2000 are presented.