简介:Thecriticaltechnicalproblemofunderwaterbottomobjectdetectionisfoundingastablefeaturespaceforechosignalsclassification.Thepastliteraturesmorefocusonthecharacteristicsofobjectechoesinfeaturespaceandreverberationisonlytreatedasinterference.Inthispaper,reverberationisconsideredasakindofsignalwithsteadycharacteristic,andtheclusteringofreverberationinfrequencydiscretewavelettransform(FDWT)featurespaceisstudied.Inordertoextracttheidentifyinginformationofechosignals,featurecompressionandclusteranalysisareadoptedinthispaper,andthecriterionofseparabilitybetweenobjectechoesandreverberationisgiven.TheexperimentaldataprocessingresultsshowthatreverberationhassteadypatterninFDWTfeaturespacewhichdiffersfromthatofobjectechoes.Itisproventhatthereisseparabilitybetweenreverberationandobjectechoes.
简介:编者按:莫斯科加加林广场的成功改建,实现了各路交通顺畅,公路、地铁、铁路之间换乘方便,生态环境得到充分保护,地下空间得到综合利用等预定目标.它的基本经验在于全面的统筹规划,周到的精心设计,各部门的协调配合,分阶段的逐步实施,一旦建成,全面收效.在规划和设计中,重现了各种建筑物的上、下、左、右结构关系的正确处理,建筑物主体与其技术管理服务设施的成龙配套,从而避免了普遍存在于建筑业中的"盲目乱建、刚建又拆"的浪费现象.此外,在改建计划实施中对降噪、减振、水和空气的净化,市政管线的建设和改造给予了极大注意.这就有可能通过一次建设或改建,向居民提供一个适于居住、工作和生活的优美环境,把"以人为本"的口号落到实处.