役生現象 的英文怎麼說
中文拼音 [yìshēngxiànxiàng]
役生現象
英文
helotism-
In this paper i calculate the reasonable possession quantity of port handling machineries with chance - constrained linear programming. first in the paper is the background and meaning of this research ; then analysis present situation of port machinery management both in practice and theory ; in chapter 3, i qualitatively discusses characters influencing machinery quantity, which include lifting ton, intact rate and using rate, age of machinery, machinery purchase and working cost and so on. in chapter 4, i take the influencing characters to mathematic model of chance - constrained linear programming, aiming to maintain the need of production and reduce machinery cost
文章首先介紹了選題的背景、意義以及主要工作;第2章介紹了港口機械管理在港口企業管理中的地位與作用,以及我國港口機械設備管理與配置現狀,並簡要介紹目前港機合理擁有量的理論研究方法;第3章從技術與經濟角度定性分析了各種因素對港機擁有量的影響,其中主要包括機械起運量、完好率與利用率、機械設備役齡、購置與營運成本等;第4章將各種影響因素引入模犁,提出以完成生產任務、機械成本最低為目標,應用隨機線性規劃模型計算港口流動機械合理擁有量的方法;第5章以大連港大港區為例對模型進行應用,選擇四種型號叉車為研究對象,對其歷史經濟與技術數據進行統計分析,其中重點對隨機變量單位臺時維修費用進行了正態分佈擬合。A type of symbiosis, as among certain ants, in which one species is dominant and makes the members of another species perform the tasks required for their mutual survival
共生(現象) ,役生現象一種共生(現象) ,如某些螞蟻,在這種現象中,一個種處于支配地位,並使得別的種的成員承擔他們共同生存所需完成的任務
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