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최영찬 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-
This study develops DSS(Decision Support System) level information system for farms. The system covers production, finance, purchase and sales management for egg farms. The system also supports management diagnosis and planning for the farm managers. Whitten's method(1994) is applied to establish SDLC(System Development Life Cycle). And March's(1988) and Rho's(1997) methods are applied to analyze the farming system and design the information system. It is the first time to apply both methods to develop information system in the field of agriculture. This management information system is developed based on the designs and applied to the selected farms for evaluation.
임경순 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-
This experiment was carried out to improve in vitro development of rabbit one-cell embryos to the blastocyst stage. One-cell rabbit embryos were collected at 19~20hr after superovulation and incubated at 39℃ in 5% CO_2 for 72hr. In order to find optimum conditions in medium that affects the rabbit embryo's development in vitro, RDH medium which mixed with RPMI1640, DMEM and Ham's F10 was compared with the previously reported mediums(Ham's F10 and RD) for embryo development and cell numbers. Three additives(BSA, taurine and glucose) were tested for the development of rabbit one-cell embryos in vitro. When the embryos were cultured in RDH medium, their development was markedly promoted as compared with Ham's F-10 or RD alone. Glucose exhibited no significant effects on embryo development and cell numbers. BSA appeared to promote transition from morula to blastocyst stage and taurine increased cell numbers of cultured embryos markedly regardless of mediums. BSA and taurine together in RDH medium showed the additive effects on embryo development and cell number.
장병욱 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-
Earth reinforcement is an effective and reliable technique for increasing the strength and stability of soils. The technique is used today in a variety of applications ranging from retaining structures and embankments to subgrade stabilization beneath footings and pavements. In this study, basic experiments of materials, strength tests were performed to develop the reinforced soil wall for agricultural structures. Thereafter, additional studies for field application, e.g. effectiveness analysis of reinforced wall by model test, cost/benefit analysis, development of surface treatment technique of soil wall will be performed.
김정한 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-
Ethaboxam is a new fungicide developed by LG Chemical Ltd. with developing code name of LGC-30473. This thiazole carboxamide was found to be very effective against Oomycetes which is responsible of Downy mildew (Plasmoparra viticola, Bremia lactucae), Late blight (Phytophthora infestans) by inhibiting mycellial growth after germination and neuclear migration. In this study aerobic soil metabolism of ethaboxam was conducted to elucidate the possible metabolic pathway for 60days at a concentration of 0.372㎍/g on a sandy loamy soil. The material balance at each sampling day ranged from 92.7% to 101.9% and the half-life of ^14C-Ethaboxam in soil was calculated to be 17 days (R^2=0.7497). The metabolites identified during the study were N- [(Z)-amino (2-thienyl)methylidene]-4-ethyl-2-(ethylamino)-1,3-thiazole-5-carboxamide [AMETC] and 4-ethyl-2-(ethylamino)-1,3-thiazole-5-carboxylicacid [ETCA], 4-ethyl-2-(ethylamino)-1,3-thiazole-5-carbox- amide [ETC] and 4-ethyl-2-(ethylamino)-N-(2-thienylcarbonyl)-1,3-thiazole-5-carbo-xamide [ETTC]. The maximum concentration of AMETC reached 122.4ng/g (32.9% of applied radiocarbon) at 14days. Evolved ^14CO_2 accounted for up to 18.2% of applied radiocarbon and no volatiles were found during the study. Nonextractable ^14C-residue accumulated up to 37.6% of that applied at 60 days after treatment and radiocarbon distributed almost evenly in humin, humic acid, and fulvic acid fraction. Based upon the results obtained in this study, metabolic pathway of eyhaboxam in soil is proposed.