Pattern design and optimization of yarn-dyed plaid fabric using isolation niche genetic algorithm and rough set theory

Under the circumstance of perceptual consumption, it is still challenging to grasp consumer's emotions and demands due to the large search space, diversified preferences, and easy fatigue of consumers. To reduce user fatigue and enlarge search space, a novel method was presented to design and optimize the pattern of yarn-dyed plaid fabric using the isolation niche genetic algorithm and rough set theory. Each pattern was encoded as a chromosome based on the real number code. The population was initialized and evolved using INGA to maintain the diversity. The rough set theory was adopted as the fitness function of isolation niche genetic algorithm to extract the consumer's demands. After multiple evolutions, a large set of practical patterns of the yarn-dyed plaid fabric are obtained. Experiments were carried out by 24 testers of different ages and genders. The results prove that the proposed method based on the isolation niche genetic algorithm and rough set theory is feasible and effective, supplying references to the designer.     

Extracellular Vesicles: Messengers of p53 in Tumor–Stroma Communication and Cancer Metastasis

Tumor progression to a metastatic and ultimately lethal stage relies on a tumor-supporting microenvironment that is generated by reciprocal communication between tumor and stromal host cells. The tumor–stroma crosstalk is instructed by the genetic alterations of the tumor cells—the most frequent being mutations in the gene Tumor protein p53 (TP53) that are clinically correlated with metastasis, drug resistance and poor patient survival. The crucial mediators of tumor–stroma communication are tumor-derived extracellular vesicles (EVs), in particular exosomes, which operate both locally within the primary tumor and in distant organs, at pre-metastatic niches as the future sites of metastasis. Here, we review how wild-type and mutant p53 proteins control the secretion, size, and especially the RNA and protein cargo of tumor-derived EVs. We highlight how EVs extend the cell-autonomous tumor suppressive activity of wild-type p53 into the tumor microenvironment (TME), and how mutant p53 proteins switch EVs into oncogenic messengers that reprogram tumor–host communication within the entire organism so as to promote metastatic tumor cell dissemination.     

基于生态位理论的城市空间优化策略研究——以增城市为例

土地利用担负着城市空间架构和空间优化的重要功能.从生态位的角度看,城市空间优化具有内在和外在两方面驱动力,分别是土地生态位扩充和土地生态位差.在内外两种驱动力的共同作用下,土地变化方向总是朝着效益最大化和生态适宜度最高的方向发展.根据土地生态位整体效益最大化原理,增城市城市空间优化应当采取以下策略:承接西南、充实中部、优化东部、平衡西部、联合南部、调控北部.     

岩体随机不连续面产状数据划分方法研究

动态聚类算法从本质上讲是单目标组合优化算法,一般需要事先给定目标分类数和初始聚类中心,且初始聚类中心的选择对数据划分结果影响较大。为了解决该问题,提出将产状数据的划分问题转化为多目标优化问题,并采用小生境Pareto遗传算法进行求解。针对聚类问题的特殊性,采用基于链表的编码方案,并建议相应的遗传操作算子;通过引入小生境技术和Pareto支配集理论,仅通过一次求解可由Pareto支配集给出对应于不同目标组数的最优分组结果,而且不用事先给定目标组数以及初始聚类中心。最后,将算法应用于三峡船闸高边坡岩体实测不连续面产状数据的划分,得到较为符合实际的优势结构面分组。     

Habitat Suitability and Landscape Structure: A Maximum Entropy Approach in a Mediterranean Area

Species distribution models have recently become important tools in ecological research. Prediction of suitable habitats for threatened and endangered species is essential for the conservation and management of their native habitats. A landscape scale approach is relevant for biodiversity conservation since landscape planning and management are generally conducted at wide spatial scales, focusing on areas with complex landscape configuration as a consequence of human activities. The aims of this study were to test a maximum entropy approach (Maxent) to the development of a niche-based model for species of conservation interest and to relate this model to landscape structure metrics. The results obtained here showed a good predictive power of Maxent for the three target species and highlighted the importance of landscape structure analysis for the detection of patterns of habitat suitability. Moreover, this work stressed that combining classical environmental information with landscape structure in analysing habitat suitability for species of conservation interest may be used to guide conservation efforts and landscape management practices.     

Niche comparisons: toward a new approach for analysing competition and organizational performance in the international construction market

Over the past few decades, studies on competition and organizational performance in the international construction market have been prolific. Construction companies are founded, then grow, compete, evolve, and die in the international landscape, a common process from an ecological perspective. However, few studies have considered the international construction market from this perspective. Using niche theory, which was initially populated in the field of natural bio-ecology and then introduced to business management and economics, a NW/O-L (niche width/overlap and location) framework is established in this study. With this framework, the niche evolution of the top 225 international contractors is explored along two dimensions—product and geography. The effects of a proper niche on an international construction company’s performance are also investigated using the cluster analysis method. It was discovered that, despite fluctuations over time, the contractor’s niche is highly related to its performance in the international construction market. The most appropriate niche for international construction contractors is a wide niche width, with a small niche overlap and with its location near to the market centre with comparatively more market resources. However, only a few contractors can survive in this niche, as the majority of contractors are in a narrow niche width, with a comparatively large niche overlap and far from the market centre. Contractors which do not fit either of these two niches have proved to be poor performers in this study.     

基于种群划分与变异策略的粒子群优化算法

粒子群算法因其形式比较简洁，参数设置灵活，操作简便易行，并且能够快速收敛，从而引起广泛关注。但是传统的粒子群算法也有缺陷：收敛速度慢以及容易陷入局部最优等。针对这些问题，本文借鉴小生境的方法，在进化初始阶段，对种群进行划分，将初始种群分为子种群，对不同的子种群进行不同的变异策略；在进化过程中，针对不同的子种群，设置不同的惯性权重因子ω，用来增强全局搜索能力与局部搜索能力。实验结果表明，本文提出的算法较传统的粒子群算法具有较快的收敛性以及找寻的全局最优解更接近真实解集，收敛精度比较高。     

Performance of four salmonids species in competition with Atlantic salmon

Economically and culturally important salmonid species often compete with Atlantic salmon (Salmo salar) released from stocking programs or that escaped during aquaculture production. Such competitive interactions may lower the individual fitness of these species by reducing survival and body growth. Here, we exposed juvenile brown trout (S. trutta), rainbow trout (Oncorhynchus mykiss), Chinook salmon (O. tshawytscha), and coho salmon (O. kisutch) to juvenile Atlantic salmon in artificial streams for 10 months. Survival and fitness-related traits of the four species were not negatively impacted by the presence of Atlantic salmon. The results suggest that brown trout and rainbow trout have better competitive abilities than Atlantic salmon, and that Chinook salmon and coho salmon have limited competitive interactions with Atlantic salmon. Although we discuss certain environmental conditions that can favor Atlantic salmon as a competitor at the juvenile life stage, Atlantic salmon may have little impact on the productivity of these four species.     

生态位理论及其在工程植被护坡中的指导意义

生态位理论（niche theory）是目前国内外生态学领域的研究热点,主要从生态位的概念出发,阐述了生态位理论在植物研究中的应用价值,并指出生态位理论在工程护坡中,对物种引进、植物选型和配置的指导意义及具体做法。     

福建省居住建筑几种生态位实态调查研究

以福建省福州、厦门、南平三地近年新建的多个楼盘为调查对象,对居住建筑的类型比例、单元组合、户型面积、空间构成、房间大小和朝向、以及开窗方位进行实态调查。通过统计分析,得出了这些生态因子的幅度范围和适生态位。调查结果表明：在竖向高度分类中,11~18层的高层建筑占的比例最大为30.56%;在平面形状分类中,2单元拼接板式...