Coding schemes for additive noise channels with feedback Scientific report no. 10

Coding systems achieving wideband and narrow band channel capacity for satellite communications - noise channel with feedbac

Semi-feedback for the binary multiplying channel

In his paper on two-way channels (TWC) Shannon (1961) derived the so-called inner and outer bound region. For a TWC without feedback the outer bound coincides with the inner bound. As a consequence, the capacity region of a TWC without feedback is equal to its inner bound. Furthermore, Shannon showed that for the binary multiplying channel (BMC) the inner and outer bound are different. Dueck (1980) also proved the existence of a TWC with feedback at one terminal (semi-feedback) for which the capacity region is in excess of its inner bound region. However, the BMC with semi-feedback was believed to have a capacity region that coincides with the inner bound region. Nevertheless, a semi-strategy has been constructed for the BMC that operates beyond the inner bound region. The semi-strategy is based on both the new message percolation technique of Schalkwijk (see Proceedings Joint Swedish-Russian International Workshop on Information Theory, vol.6, p. 87-91, Sweden, 1993) and the old bootstrapping techniqu

Correction to 'On the error probability for a class of binary recursive feedback strategies'

No abstract

Social environment and healthy ageing

growing numbers of people living to older ages, age-related diseases have become an increasing challenge for societies everywhere. Many age-related diseases however, should rather be considered lifestyle-related diseases since lifestyle plays an important role in the etiology and the treatment of cardiovascular disease, obesity, type 2I diabetes and many forms of cancer. This has led to a large body of literature investigating the possibility to change people’s lifestyle. Interventions with, for example, physiotherapists that engage in daily physical activity with older people have shown substantial benefits, even reversing type 2 diabetes and some characteristics of the ageing process (1,2). Most lifestyle interventions, however, struggle to achieve sustained, long-term behavioural change (3,4). Few individuals can maintain the effort to adopt a new diet or exercise regime themselves, without intensive coaching by professionals. These interventions are therefore expensive and this hinders the widespread and continued delivery to the growing number of older people with unhealthy lifestyle and (risk for) age-related disease. Therefore, it is important to explore novel sustainable and cost-effective methods for lifestyle interventions to combat the burden of agerelated disease in ageing societies. One often overlooked influence on the health behaviour of older people is the effect of the social environment. We believe that peer coaching, in which older people coach each other in achieving lifestyle changes, is such a promising method to deliver health benefits in a sustainable, scalable way. Although there is substantial documentation of the effect of peers on adolescents and children, the influence of peers has been overlooked in older people. In peer coaching, the social environment is applied as a method to deliver an intervention. Peer coaching is a face-to-face intervention in which a group is led by a peer, a non-professional, who shares a common background with the participants. A peer coach uses experiential knowledge to understand the wishes, motivations, possibilities and limitations of the participants. In the secondary prevention of alcohol abuse, peer coaching is already applied very successfully through Alcoholics Anonymous, which delivers health benefits through peer coaching to over two million members spread over 150 countries (5,6). Since increasing physical activity is able to ameliorate so many characteristics of the ageing process, we have studied a proof-of-principle in which peer coaching is applied to establish a sustainable and cost-effective increase in physical activity of a group of older adults in The Netherland