Chaos in drive systems

The purpose of this article is to provide an elementary introduction to the subject of chaos in the electromechanical drive systems. In this article, we explore chaotic solutions of maps and continuous time systems. These solutions are also bounded like equilibrium, periodic and quasiperiodic solutions

Norleucine, a natural occurrence in a novel ergot alkaloid γ-ergokryptinine

A novel natural peptide ergot alkaloid γ-ergokryptinine containing norleucine has been isolated from ergot sclerotia of the field-growing parasitic fungus Claviceps purpurea CCM 8059. Its structure was deduced from the NMR and mass spectral data. The final structural proof was provided by the crystal structure determination, which is the first X-ray structure of a natural Nle-containing secondary metabolite. The conformations of three ergopeptinines: γ-ergokryptinine, ergoladinine, and α-ergokryptinine were compared. © Springer-Verlag 2005

Analiza i modeliranje dinamičkih svojstava interaktivnog pogonskog sustava

The recent drive systems are considered as interactive systems containing a range of subsystems with different physical nature. This contribution deals with the modelling of mechatronic drive systems using numerical package DYNAST. The theoretical general observations are demonstrated on particular experiments on real system.Moderni pogonski sustavi smatraju se interaktivnim sustavima koji sadržavaju podsustave različitih fizikalnih svojstava. Ovaj dokument prikazuje modeliranje mehatroničkog pogonskog sustava korištenjem numeričkog paketa DYNAST. Načelna teorijska razmatranja demonstrirana su pomoću konkretnih eksperimenata na realnom sustavu

Structural parameterizations for boxicity

The boxicity of a graph $G$ is the least integer $d$ such that $G$ has an intersection model of axis-aligned $d$-dimensional boxes. Boxicity, the problem of deciding whether a given graph $G$ has boxicity at most $d$, is NP-complete for every fixed $d \ge 2$. We show that boxicity is fixed-parameter tractable when parameterized by the cluster vertex deletion number of the input graph. This generalizes the result of Adiga et al., that boxicity is fixed-parameter tractable in the vertex cover number. Moreover, we show that boxicity admits an additive $1$-approximation when parameterized by the pathwidth of the input graph. Finally, we provide evidence in favor of a conjecture of Adiga et al. that boxicity remains NP-complete when parameterized by the treewidth.Comment: 19 page

The language of malaria in Abui: An interdisciplinary investigation of healthcare practices in Alor, Eastern Indonesia

We report on an interdisciplinary collaboration between public health experts, linguists, and botanists which seeks to better understand indigenous perspectives on malaria among the Abui [abz] speaking communities of Alor Island, Eastern Indonesia. Malaria is endemic in Alor and is highly resistant to common conventional treatment regimens (Sutanto et al. 2009). There is a low rate of compliance with modern malaria treatments, and a correspondingly high reliance on traditional treatment methods (Krentel 2008). Our research attempts to understand traditional knowledge of malaria in Abui and its relevance to modern healthcare. We analyze a corpus of unstructured interviews concerning health-related problems in Abui in order to better understand the conceptualization of disease (Forster 1976). This includes the systematic study of metaphor (Author 2016), sequencing of symptom descriptions (Author 2016), symptom-based indigenous classification of malaria, an inventory of traditional health-protecting practices, and an inventory of medical plants. The plant terminology reveals a syncretism between terms referring to diseases and the plants which either treat or cause those diseases. For example, the term takaya denotes both the ti plant (Cordyline fruticosa) and a severe form of malaria (Plasmodium falciparum). The leaves of the ti plant takaya are tied onto valuable trees such as candlenut, areca palm, and jackfruit to create a protective spell which wards off theft of the fruits or nuts of that tree. Transgressing this protection by taking the fruits or nuts without permission will cause the transgressor to suffer the takaya disease. The existence of supernatural causes may go unnoticed when interviews are conducted in Indonesian, the national language closely associated with modernity. However, the pervasiveness of plant-disease syncretism within Abui belies the continuing significance of traditional beliefs regarding disease. The collaborative methodology described here shows great promise for improving our understanding of the conceptualization of malaria in Abui and thus increasing treatment efficacy for this disease. Moreover, this approach provides a platform for documentary linguistics which includes a high level of community engagement. The healthcare interviews yield a culturally significant corpus of spontaneous speech which also serves as an independent knowledge base to evaluate the reliability and accuracy of ethnobotanical research. Finally, we suggest several ways in which our approach can be applied to future healthcare research in other domains and with other communities. References Author. 2016. The Pragmatics Behind the Medical and Health Knowledge in Alor: An Understanding of how disease is conceptualized in the Abui language. Honors thesis. Nanyang Technological University, Singapore. Du Bois, Cora. 1944. The People of Alor: a social-psychological study of an East Indian island. Minnesota: The University of Minnesota Press Forster, George M. 1976. Disease Etiologies in Non-Western Medical Systems. American Anthropologist 78(4): 773-782. Krentel, Alison. 2008. Why do individuals comply with mass drug administration for lymphatic filariasis? A case study from Alor District, Indonesia. PhD dissertation. London School of Hygiene & Tropical Medicine. Sutanto, I. Nurhayati, S. S., Manoempil, P., Baird, J.K. 2009. Resistance to Choloroquine by Plasmodium vivax at Alor in the Lesser Sundas Archipelago in Eastern Indonesia. The American Society of Tropical Medicine and Hygiene, 81(2), 338-342. Author. 2016. The Semantics of Complex Sentences in the Discourse of Health and Diseases: A Case Study in Abui. Honors thesis. Nanyang Technological University, Singapore

Open problems on graph coloring for special graph classes.

For a given graph G and integer k, the Coloring problem is that of testing whether G has a k-coloring, that is, whether there exists a vertex mapping c:V→{1,2,…}c:V→{1,2,…} such that c(u)≠c(v)c(u)≠c(v) for every edge uv∈Euv∈E. We survey known results on the computational complexity of Coloring for graph classes that are hereditary or for which some graph parameter is bounded. We also consider coloring variants, such as precoloring extensions and list colorings and give some open problems in the area of on-line coloring

A morphometric system to distinguish sheep and goat postcranial bones.

Distinguishing between the bones of sheep and goat is a notorious challenge in zooarchaeology. Several methodological contributions have been published at different times and by various people to facilitate this task, largely relying on a macro-morphological approach. This is now routinely adopted by zooarchaeologists but, although it certainly has its value, has also been shown to have limitations. Morphological discriminant criteria can vary in different populations and correct identification is highly dependent upon a researcher's experience, availability of appropriate reference collections, and many other factors that are difficult to quantify. There is therefore a need to establish a more objective system, susceptible to scrutiny. In order to fulfil such a requirement, this paper offers a comprehensive morphometric method for the identification of sheep and goat postcranial bones, using a sample of more than 150 modern skeletons as a basis, and building on previous pioneering work. The proposed method is based on measurements-some newly created, others previously published-and its use is recommended in combination with the more traditional morphological approach. Measurement ratios, used to translate morphological traits into biometrical attributes, are demonstrated to have substantial diagnostic potential, with the vast majority of specimens correctly assigned to species. The efficacy of the new method is also tested with Discriminant Analysis, which provides a successful verification of the biometrical indices, a statistical means to select the most promising measurements, and an additional line of analysis to be used in conjunction with the others

A morphometric system to distinguish sheep and goat postcranial bones.

Distinguishing between the bones of sheep and goat is a notorious challenge in zooarchaeology. Several methodological contributions have been published at different times and by various people to facilitate this task, largely relying on a macro-morphological approach. This is now routinely adopted by zooarchaeologists but, although it certainly has its value, has also been shown to have limitations. Morphological discriminant criteria can vary in different populations and correct identification is highly dependent upon a researcher's experience, availability of appropriate reference collections, and many other factors that are difficult to quantify. There is therefore a need to establish a more objective system, susceptible to scrutiny. In order to fulfil such a requirement, this paper offers a comprehensive morphometric method for the identification of sheep and goat postcranial bones, using a sample of more than 150 modern skeletons as a basis, and building on previous pioneering work. The proposed method is based on measurements-some newly created, others previously published-and its use is recommended in combination with the more traditional morphological approach. Measurement ratios, used to translate morphological traits into biometrical attributes, are demonstrated to have substantial diagnostic potential, with the vast majority of specimens correctly assigned to species. The efficacy of the new method is also tested with Discriminant Analysis, which provides a successful verification of the biometrical indices, a statistical means to select the most promising measurements, and an additional line of analysis to be used in conjunction with the others