Reduced costs propagation in an efficient implicit enumeration for the 01 multidimensional knapsack problem

In a previous work we proposed a variable fixing heuristics for the 0-1 Multidimensional knapsack problem (01MDK). This approach uses fractional optima calculated in hyperplanes which contain the binary optimum. This algorithm obtained best lower bounds on the OR-Library benchmarks. Although it is very attractive in terms of results, this method does not prove the optimality of the solutions found and may fix variables to a non-optimal value. In this paper, we propose an implicit enumeration based on a reduced costs analysis which tends to fix non-basic variables to their exact values. The combination of two specific constraint propagations based on reduced costs and an efficient enumeration framework enable us to fix variables on the one hand and to prune significantly the search tree on the other hand. Experimentally, our work provides two main contributions: (1) we obtain several new optimal solutions on hard instances of the OR-Library and (2) we reduce the bounds of the number of items at the optimum on several harder instances.     

Families with young children in times of economic downturn: Implications for social work practice

In response to the global financial crisis, social policies in Europe and elsewhere incorporated a logic of social investment to reduce (child) poverty and social inequality. Several critiques, however, have been raised against the narrowness of this discourse. In order to introduce another way of seeing, an interview study was conducted inspired by the interpretative paradigm of lifeworld orientation. This has allowed us to acquire a critical, in‐depth understanding of the consequences of economic downturn and unemployment for families with young children (0–3 years old), from their point of view. Findings highlight the importance of listening to parents here and now, in order to be able to take account of their concrete, lived realities within the context of the broader society and critically assess these realities according to principles of human dignity and social justice. Implications for social work practice are discussed.     

The Boric Acid Powder Treatment of Vulvovaginal Candidiasis

Abstract

This double blind comparison of fourteen daily intravaginal gelatin capsules containing 600 mg of boric acid powder versus identical capsules containing 100,000 units of nystatin diluted to volume with cornstarch found vulvovaginal candidiasis albicans cure rates for boric acid to be 92% seven to ten days after treatment and 72% at thirty days, whereas the nystatin cure rates were 64% at seven to ten days and 53% at thirty days. Speed of alleviation of signs and sumptoms was similar with both drugs. There were no untoward side effects, and cervical cytology was not affected. In vitro studies found boric acid to be fungistatic and its effectiveness to be unrelated to pH. Blood boron analyses indicated little absorption from the vagina and a half life of less than 12 hours. A 30% follow-up of 2,030 nonstudy patients revealed wet mount and symptom cure rates of 93% within two weeks and 88% within four weeks. Patient acceptance was better than with “messy” vaginal creams, and self-made boric acid powder capsules are inexpensive, 31¢ for fourteen, compared with costly, commonly prescribed medication.     

“生态哲学”:野性的力量

现代性由一些理性的概念酝酿形成.这些概念被法兰克福学派的哲学家们称之为“工具理性”,它们给功利主义以特殊待遇,将所有人的参数,如喜悦、游戏、梦想等,也就是通常意义上的“好的状况”束之高阁.这导致了世界的“荒芜”,完成了对生态的掠夺.一种极性的反向变化正在人们的思想中进行.这是被社会学家们(例如索罗金)称之为文化“饱和”的现象.这也引起了理性的另一种应用:“感性理智”.也就是说,迫使我们承认“人类动物”有着一部分动物性的东西:本能、激情、感情等等.由此,人们能够到达一种“生态哲学”;也就是说,智慧与“部屋(希腊语为“oikos”)”相关联.这就是被埃德加·莫兰称作应当重新予以重视的“土地一母亲”.也就是我所讲的“积极寻根”.     

Social interaction targets enhance 13-month-old infants' associative learning

Infants are attentive to third-party interactions, but the underlying mechanisms of this preference remain understudied. This study examined whether 13-month-old infants (N = 32) selectively learn cue–target associations guiding them to videos depicting a social interaction scene. In a visual learning task, two geometrical shapes were repeatedly paired with two kinds of target videos: two adults interacting with one another (social interaction) or the same adults acting individually (non-interactive control). Infants performed faster saccadic latencies and more predictive gaze shifts toward the cued target region during social interaction trials. These findings suggest that social interaction targets can serve as primary reinforcers in an associative learning task, supporting the view that infants find it intrinsically valuable to observe others’ interactions.