Batch sequential designs for computer experiments

Computer models simulating a physical process are used in many areas of science. Due to the complex nature of these codes it is often necessary to approximate the code, which is typically done using a Gaussian process. In many situations the number of code runs available to build the Gaussian process approximation is limited. When the initial design is small or the underlying response surface is complicated this can lead to poor approximations of the code output. In order to improve the fit of the model, sequential design strategies must be employed. In this paper we introduce two simple distance based metrics that can be used to augment an initial design in a batch sequential manner. In addition we propose a sequential updating strategy to an orthogonal array based Latin hypercube sample. We show via various real and simulated examples that the distance metrics and the extension of the orthogonal array based Latin hypercubes work well in practice.     

Living beyond the unanticipated sudden death of a partner: a phenomenological study

This research project explored grief and its impact upon men and women who have experienced the sudden and unanticipated death of his or her partner. It included what grief meant to them, how it was manifested in his or her everyday lives and how his or her partner's death had impacted upon his or her relationship with themselves, with others and the world. A Husserlian phenomenological approach was used to explore the experiences of the ten women and five men whose partner had died up to five years prior to being interviewed. The need for the surviving partner to continue to participate in everyday life placed great strain upon the internal resources of the surviving partner. The surviving partner needed to reinvent him or herself, in an attempt to become independent and regain functionality, whilst dealing with the sadness and loss that they had experienced. The surviving partner discovered that a new life order emerged that included hope, optimism, planning for the future and perhaps the prospect of a new relationship. The death of a partner left the surviving partner with a loss that would always be a part of them, with the memories of his or her relationship being maintained within them that will never be replaced by somebody else. The results of this research project reinforce the need for ongoing education of the community in grief and bereavement issues in order to increase the awareness of the support needs of the bereaved person. The length of time and amount of energy required to incorporate the experience into the survivor's life, is greatly underestimated by the community, and perhaps by some of the health and caring professionals. Colonial and hospital based bereavement support services need to be established and be proactive using outreach programs, actively offering the suddenly bereaved partner and family support and information.