Re-mining association mining results through visualization, data envelopment analysis, and decision trees

Re-mining is a general framework which suggests the execution of additional data mining steps based on the results of an original data mining process. This study investigates the multi-faceted re-mining of association mining results, develops and presents a practical methodology, and shows the applicability of the developed methodology through real world data. The methodology suggests re-mining using data visualization, data envelopment analysis, and decision trees. Six hypotheses, regarding how re-mining can be carried out on association mining results, are answered in the case study through empirical analysis

Diffusion of innovation and collective action in complex networks

In this thesis, we implement the existing models for the diffusion of innovation and we present a novel model for the collective action in complex networks. We also create a new network called the Robin Hood network using poor get richer approach. The di usion models are divided into three components, namely node, link and neighbor diffusion. Each diffusion model is simulated in ring lattice, small worlds, random networks and scale free networks in order to analyze the e ect of network topology. The simulation results suggest that low level of clustering coefficient and average path length, as well as the presence of hubs are efficient for the innovation to become widespread. Comparative results for the collective action show that the presence of hubs is insignificant for determining the size of the collective subset. On the other hand, the tightly-knit communities are e ective for the collective decision making. We also provide sufficient parameters for the modelling of networks where both the diffusion and collective action take place. According to our results, the clustering plays an important role in both diffusion and collective action. However, the presence of hubs is not a must for collective action

Insights into the efficiencies of on-shore wind turbines: a data-centric analysis

Literature on renewable energy alternative of wind turbines does not include a multidimensional benchmarking studythat can help investment decisions as well as design processes. This paper presents a data-centric analysis of commercial on-shore wind turbines and provides actionable insights through analytical benchmarking through Data Envelopment Analysis (DEA), visual data analysis, and statistical hypothesis testing. The paper also introduces a novel visualization approach for the understanding and the interpretation of reference sets, the set of efficient wind turbines that should be taken as benchmark by inefficient ones

Encapsulating and representing the knowledge on the evaluation of an engineering system

This paper proposes a cross-disciplinary methodology for a fundamental question in product development: How can the innovation patterns during the evolution of an engineering system (ES) be encapsulated, so that it can later be mined through data mining analysis methods? Reverse engineering answers the question of which components a developed engineering system consists of, and how the components interact to make the working product. TRIZ answers the question of which problem-solving principles can be, or have been employed in developing that system, in comparison to its earlier versions, or with respect to similar systems. While these two methodologies have been very popular, to the best of our knowledge, there does not yet exist a methodology that reverseengineers and encapsulates and represents the information regarding the complete product development process in abstract terms. This paper suggests such a methodology, that consists of mathematical formalism, graph visualization, and database representation. The proposed approach is demonstrated by analyzing the design and development process for a prototype wrist-rehabilitation robot

New knowledge in strategic management through visually mining semantic networks

International audienc

Bir acil servisin kullanım özellikleri ve başvuran hastaların aciliyetinin hekim ve hasta açısından değerlendirilmesi

Objectives: Many patients present to emergency departments (ED) with nonurgent complaints. Inappropiate visits may contribute to emergency department overcrowding. This study aims to investigate the causes of inappropriate visits and to assess urgency from the patient and physician point of view. Materials and Methods: All consecutive adult patients referred to the ED during a 28-day period were enrolled in this cross sectional study. Demographic and socioeconomic variables and reasons for the visits were record;not;ed. NRS (Numeric Rating Scale) was used to rate perceptions regarding urgency of the current visit. Resident physicians taking care of the patients also rated their opinions of appropriateness of ED utilization on NRS. All patients were categorized as to their appropriateness for ED care. Results: 2.351 (92,8%) out of 2.533 patients provided complete data sets. 67.8% of visits were catagorized as appropriate for ED care by the resident. Lower NRS scores were encountered younger patients, women, single, with higher levels of educated and those who visited the ED for institutional reputation. Availability of health insurance did not contribute to a statistically significant difference with regarding appropriateness of visits. Patient and physician perceptions of appropriateness were significantly correlated. Conclusion: Our results show that there is agreement between patient and physician perception of urgency regarding ED visits. Availability of health insurance was not associated with less ;quot;inappropriate;quot; ED utilization. Single, female, educated patients with a higher socioeconomic standing visited the ED inappropriately more frequently. Future studies are required to futher investigate issues related to inappropriate visits.Giriş: Kesintisiz hizmet veren acil servislere herhangi bir yakınma ile çok sayıda hasta başvurmaktadır. Bu hastalar incelendiğinde başvuru nedeni acil olmayanların bulunduğu görülmektedir. Acil olmayan başvurular yoğun olan acil servislerin işleyişini olumsuz etkilemektedirler. Bu çalışma ile amaçlanan başvuruların aciliyetini irdelemek olduğu kadar başvuruların aciliyetinin hasta ve hekim bakış açısıyla nasıl algılandığını ortaya koymaktır. Gereç ve Yöntem: Bu çalışma bir analitik kesitsel çalışmadır. Yirmi sekiz günlük zaman dilimi içinde acil servise başvuran tüm hastaların demografik bilgileri, sosyoekonomik durumları yakınmaları ve yapılan inceleme ve girişimler hakkında bilgi toplandı. Ayrıca her hastadan aciliyetlerine yönelik olarak kendi düşüncelerini yansıtan puanları NRS (Numeric Rating Scale) ölçeği üzerinde belirtmeleri istendi. Hastadan sorumlu kıdemli ve kıdemsiz asistanlar da hastanın aciliyetine yönelik görüşlerini NRS ölçeği üzerinde bildirdiler. Çalışma sonunda her hasta için doldurulan formlar kategorilere göre değerlendirilerek incelendi. Hastaların başvurularının aciliyet yönünden uygunluğu, bir Acil Tıp Uzmanı tarafından belirlendi. Bulgular: Çalışma dönemi boyunca acil servise başvuran 2.533 hastanın 2.351'inden (%92,8) yeterli veri edinildi. Kullanılan kategori sınıflaması ve uzman kararı sonrasında başvuruların %67,8'i aciliyet açısından uygun bulundu. Gençlerin (17-39 yaş), kadınların, bekarların, eğitim düzeyi yüksek olanların ve acil servise güvendiği için başvuran hastaların aciliyet uygunluğunun daha düşük olduğu saptandı. Sosyal güvence grupları arasında ve gelir grupları arasında aciliyetin uygunluğu açısından anlamlı fark saptanmadı. Acil servisin en çok tercih sebebi güvenilir bulunmasıdır. Hastaların aciliyet algıları ile hekimlerinin değerlendirmeleri arasında istatistiksel olarak anlamlı fark saptandı. Sonuç: Uygun olmayan başvurular incelendiğinde genelde sosyoekonomik düzeyi yüksek olan hastaların acil servisi uygunsuz kullanımı gözlendi. Bu grup hastalar daha hızlı ve kaliteli hizmet talep etmeleriyle ilişkili olabilir. Acil servis hizmetlerinin güvenle sürdürülebilmesi için birinci basamak sağlık hizmetlerinin güçlendirilmesi gereklidir. Ülkemizde hastaların acil servisleri kullanımı konusunda ileri çalışmalara ihtiyaç olduğunu düşünmekteyiz