有耗媒质及半空间上行波天线的加载

对有耗空间及分层媒质界面上的行波天线加载问题进行了讨论。提出了支持相应天线上行波电流的加载公式。所得出的公式普遍运用于一般的非对称线天线。数值计算表明，本文方法与已知理论的计算结果一致。     

The 2-Edge-Connected Subgraph Polyhedron

We study the polyhedron P(G) defined by the convex hull of 2-edge-connected subgraphs of G where multiple copies of edges may be chosen. We show that each vertex of P(G) is also a vertex of the LP relaxation. Given the close relationship with the Graphical Traveling Salesman problem (GTSP), we examine how polyhedral results for GTSP can be modified and applied to P(G). We characterize graphs for which P(G) is integral and study how this relates to a similar result for GTSP. In addition, we show how one can modify some classes of valid inequalities for GTSP and produce new valid inequalities and facets for P(G).     

Robotic-Cell Scheduling: Special Polynomially Solvable Cases of the Traveling Salesman Problem on Permuted Monge Matrices

In this paper, we introduce the 1 − K robotic-cell scheduling problem, whose solution can be reduced to solving a TSP on specially structured permuted Monge matrices, we call b-decomposable matrices. We also review a number of other scheduling problems which all reduce to solving TSP-s on permuted Monge matrices. We present the important insight that the TSP on b-decomposable matrices can be solved in polynomial time by a special adaptation of the well-known subtour-patching technique. We discuss efficient implementations of this algorithm on newly defined subclasses of permuted Monge matrices.     

旅游地生命周期巩固阶段古镇开发思路探析——以磁器口古镇为例

结合瓷器口的发展历程,从独特性和出现的问题两方面探讨古镇旅游的特征;通过分析古镇旅游特征,从古镇内部状况改良和面向需求提高市场竞争力两方面,对旅游地生命周期巩固阶段古镇旅游开发思路探讨。     

Comparison of treatment regimes with adjustment for auxiliary variables

Treatment regimes are algorithms for assigning treatments to patients with complex diseases, where treatment consists of more than one episode of therapy, potentially with different dosages of the same agent or different agents. Sequentially randomized clinical trials are usually designed to evaluate and compare the effect of different treatment regimes. In such designs, eligible patients are first randomly assigned to receive one of the initial treatments. Patients meeting some criteria (e.g. no progressive disease) are then randomized to receive one of the maintenance treatments. Usually, the procedure continues until all treatment options are exhausted. Such multistage treatment assignment results in treatment regimes consisting of initial treatments, intermediate responses and second-stage treatments. However, methods for efficient analysis of sequentially randomized trials have only been developed very recently. As a result, earlier clinical trials reported results based only on the comparison of stage-specific treatments. In this article, we propose a model that applies to comparisons of any combination of any number of treatment regimes regardless of the number of stages of treatment adjusted for auxiliary variables. Contrasts of treatment regimes are tested using the Wald chi-square method. Both the model and Wald chi-square tests of contrasts are illustrated through a simulation study and an application to a high-risk neuroblastoma study to complement the earlier results reported on this study.     

北戴河家庭旅馆经营模式探析

针对秦皇岛市北戴河区家庭旅馆经营存在的问题,通过深入调研和数据整理,分析其经营规模、经营效益、宣传方式、消费者认可度等,提出发展多种经营、个性化定位、开展网络营销等策略。研究结果为北戴河家庭旅馆发展提供参考。     

一个Stefan问题的行波解

在已有文献的基础上进一步讨论了一维Ｓｔｅｆａｎ问题行波解的稳定性，并对已有文献的结果加以推广，得到了行波解估计的一个充分必要条件     

清代中外旅行家笔下的蒙古地区——以1688年的三部行纪为中心

1688年,清政府派往俄国的使团成员写有三部旅行记,较为详细地记述了当时蒙古地区的物产、经济、生活、习俗等状况。     

旅游企业纵向并购的边界测量探析

旅游企业纵向并购的最根本的原因是资产专用性。以此为基点确定旅游企业并购的规模边界，交易成本的增加与组织成本增加达到均衡状态下的资产专用性程度决定着企业的纵向并购规模。目标企业的潜在价值是并购实现协同效益的根本原因，而据企业盈利能力的角度分析目标企业的潜在价值可确定企业并购的财务边界。     

走向东洋:移植日本的书院制度

明清之际,中国书院作为一种文化教育制度,移植到了一衣带水的近邻日本。日本书院以传播儒家文化为主要使命,有着教育教学、出版图书等多种文化功能。其学校性质的书院又分为寺子屋、私塾、乡学、官学等几个高低不同的层次,另外还有专门教授医学知识和培训中国留学生的书院。甲午战争中国失败之后,日本人把书院办到了中国本土,惜乎这一书院的回流是一种充满痛苦的文化现象。