A review of research on microseisms

This paper reviews the various problems of research on microseisms, and also the method of obtaining seismograms. Direction finding techniques are outlined, and possible origins of microseisms are suggested. The surf and wind theory of microseisms are compared. Mention is also made of some recent theories of microseisms. The paper shows how the subject of microseisms is closely connected with that of swell and storm prediction, a problem of interest to Defence Scientists and Meteorologists

Determining the direct mailing frequency with dynamic stochastic programming

Both in business to business and in consumer markets direct mailings are an important means of communication with individual customers. This paper studies the mailing frequency problem that addresses the issue of how often to send a mailing to an individual customer in order to establish a profitable long-term relationship rather than targeting profitable groups of customers at every new mailing instance. The mailing frequency is optimized using long-term objectives but restricts the decisions to the number of mailings to send to the individual over consecutive finite planning periods. A stochastic dynamic programming model that is formulated for this problem is easy to solved for many applications in direct mailing. A particular implementation of the model will provide the direct mailer with controls to stimulate desired response behavior of their customers. The model is calibrated for a large non-profit organization and shows that very large improvements can be achieved by approaching the mailing strategy with the mailing frequency problem, both in the number of mailing to send and in the profits resulting from the responses

Urgensi Kehadiran Hukum Keluarga di Aceh

A valid marriage according to the religion, but not legal under state law led to marriage is not legal protection, so that the rights are owned by the family unprotected. Additionally, family law arrangements are still voluntary, can cause difficulties in realizing the goal of law that works to protect the rights of every person in family relationships. The issue of family law at the present time needs serious and comprehensive arrangement, namely the presence of family law in Aceh. Family law has a crucial role in regulating the various issues ranging from the establishment of a family to provide guarantees for the fulfillment of the rights possessed by each member of the family.IntisariPerkawinan yang sah menurut agama, tetapi tidak sah menurut hukum negara menyebabkan perkawinan tidak mendapatkan perlindungan hukum, sehingga hak-hak yang dimiliki oleh keluarga tidak terlindungi. Selain itu, pengaturan hukum keluarga yang masih bersifat fakultatif, dapat menyebabkan kesulitan dalam mewujudkan tujuan hukum yang berfungsi untuk melindungi hak-hak yang dimiliki oleh setiap orang dalam hubungan keluarga. Persoalan hukum keluarga pada masa kini perlu pengaturan secara serius dan komprehensif, yakni kehadiran Hukum Keluarga di Aceh. Hukum keluarga memiliki peranan yang krusial dalam mengatur pelbagai permasalahan mulai dari pembentukan sebuah keluarga hingga memberikan jaminan atas terpenuhinya hak-hak yang dimiliki oleh masing-masing anggota keluarga

A parasitic myoma: clinicopathological study of a rare case

Leiomyoma is a benign tumour composed of smooth muscle cells with fibrous stroma and it is the commonest tumour amongst the tumours of uterus. As per FIGO classification system parasitic leiomyoma has no myometrial involvement or uterine attachment. These myomas get detached from the uterus and receive the blood supply from another source. The etiology and pathologic basis of these parasitic fibroids is not yet clearly understood. We report a rare case of parasitic myoma in a 29 years old female patient presented with abdominal discomfort and difficulty in micturition. Clinical examination and subsequent imaging studies revealed a pelvic mass. Histopathological examination of which proved it to be a parasitic myoma. Parasitic myoma is a rare entity which may be iatrogenically created after surgery particularly with morcellation technique. With increasing rates of laparoscopic procedures, surgeons should be aware of the possibility of formation of parasitic myoma and should take intraoperative precautions to minimise its formation

Direct Mailing Decisions for a Dutch Fundraiser

Direct marketing firms want to transfer their message as efficiently as possible in order to obtain a profitable long-term relationship with individual customers. Much attention has been paid to address selection of existing customers and on identifying new profitable prospects. Less attention has been paid to the optimal frequency of the contacts with customers. We provide a decision support system that helps the direct mailer to determine mailing frequency for active customers. The system observes the mailing pattern of these customers in terms of the well known R(ecency), F(requency) and M(onetary) variables. The underlying model is based on an optimization model for the frequency of direct mailings. The system provides the direct mailer with tools to define preferred response behavior and advises the direct mailer on the mailing strategy that will steer the customers towards this preferred response behavior

Joint optimization of customer segmentation and marketing policy to maximize long-term profitability

With the advent of one-to-one marketing media, e.g. targeted direct mail or internet marketing, the opportunities to develop targeted marketing campaigns are enhanced in such a way that it is now both organizationally and economically feasible to profitably support a substantially larger number of marketing segments. However, the problem of what segments to distinguish, and what actions to take towards the different segments increases substantially in such an environment. A systematic analytic procedure optimizing both steps would be very welcome.In this study, we present a joint optimization approach addressing two issues: (1) the segmentation of customers into homogeneous groups of customers, (2) determining the optimal policy (i.e., what action to take from a set of available actions) towards each segment. We implement this joint optimization framework in a direct-mail setting for a charitable organization. Many previous studies in this area highlighted the importance of the following variables: R(ecency), F(requency), and M(onetary value). We use these variables to segment customers. In a second step, we determine which marketing policy is optimal using markov decision processes, following similar previous applications. The attractiveness of this stochastic dynamic programming procedure is based on the long-run maximization of expected average profit. Our contribution lies in the combination of both steps into one optimization framework to obtain an optimal allocation of marketing expenditures. Moreover, we control segment stability and policy performance by a bootstrap procedure. Our framework is illustrated by a real-life application. The results show that the proposed model outperforms a CHAID segmentation