Integrable deformations of the Bogoyavlenskij-Itoh Lotka-Volterra systems

We construct a family of integrable deformations of the Bogoyavlenskij-Itoh systems and construct a Lax operator with spectral parameter for it. Our approach is based on the construction of a family of compatible Poisson structures for the undeformed system, whose Casimirs are shown to yield a generating function for the integrals in involution of the deformed systems. We show how these deformations are related to the Veselov-Shabat systems.Comment: 23 pages, 14 reference

Crystal structure and electrical properties of textured Ba2Bi4Ti5O18 ceramics

Highly textured Ba2Bi4Ti5O18 ceramic was prepared by spark plasma sintering (SPS). X-ray diffraction of the ceramics revealed the coexistence of a major ferroelectric phase (Space group, SG: B2cb) and a minor paraelectric phase (SG: I4/mmm) at room temperature. A diffused phase transition was observed at around 240 °C. The evolution of the switching current peaks in the electric current vs. electric field (I-E) loops with increasing temperature was interpreted by the structural changes and temperature dependent polarisation reversal processes. The slim polarisation vs. electric field (P-E) loops, the extra switching current peaks in the I-E loops and the non-zero piezoelectric d33 coefficient indicate that Ba2Bi4Ti5O18 is a relaxor ferroelectric material. The recoverable energy density (0.41 ± 0.01 J/cm3) of Ba2Bi4Ti5O18 ceramics in the perpendicular direction to the SPS pressing direction is close to that of Pb(Mg1/3Nb2/3)O3-based ceramics. The obtained results suggest Ba2Bi4Ti5O18 ceramics might be promising for energy storage applications

Pemodelan Pertumbuhan Ekonomi Indonesia Menggunakan Data Panel Dinamis Dengan Pendekatan Generalized Method of Moment Arellano-Bond

Pertumbuhan ekonomi merupakan Perubahan aktivitas perekonomian dalam menghasilkan tambahan pendapatan masyarakat suatu negara dalam periode tertentu. Variabel-variabel ekonomi bersifat dinamis sehingga pada penelitian ini digunakan pemodelan menggunakan metode regresi data panel dinamis. Metode regresi data panel dinamis tidak hanya untuk mengetahui efek jangka pendek (short-run effect), namun juga efek jangka panjang (long-run effect). Faktor-faktor yang diduga mempengaruhi pertumbuhan ekonomi di Indonesia adalah investasi luar negeri, pengeluaran pemerintah dan penyerapan tenaga kerja. Berdasarkan hasil analisis estimasi Generalized Method of Moment (GMM) Arellano-Bond, variabel yang berpengaruh signifikan terhadap pertumbuhan ekonomi adalah investasi luar negeri dan pengeluaran pemerintah. Selanjutnya mendapatkan pemodelan dan mengetahui elastisitas jangka pendek dan jangka panjang. Elastisitas jangka pendek investasi luar negeri sebesar 0,00269 dan jangka panjang sebesar 0,08661. Hal ini menunjukkan bahwa setiap peningkatan 10 persen investasi luar negeri suatu provinsi, maka akan meningkatkan Produk Domestik Regional Bruto (PDRB) secara jangka pendek sebesar 0,0269 persen dan jangka panjang sebesar 0,8661 persen. Elastisitas jangka pendek pengeluaran pemerintah sebesar 0,00198 dan jangka panjang sebesar 0,06384. Hal ini menunjukkan bahwa setiap peningkatan 10 persen pengeluaran pemerintah suatu provinsi, maka akan meningkatkan PDRB secara jangka pendek sebesar 0,0198 persen dan jangka panjang sebesar 0,6384 persen

Modeling Hidden Nodes Collisions in Wireless Sensor Networks: Analysis Approach

This paper studied both types of collisions. In this paper, we show that advocated solutions for coping with hidden node collisions are unsuitable for sensor networks. We model both types of collisions and derive closed-form formula giving the probability of hidden and visible node collisions. To reduce these collisions, we propose two solutions. The first one based on tuning the carrier sense threshold saves a substantial amount of collisions by reducing the number of hidden nodes. The second one based on adjusting the contention window size is complementary to the first one. It reduces the probability of overlapping transmissions, which reduces both collisions due to hidden and visible nodes. We validate and evaluate the performance of these solutions through simulations

A Riemann solver at a junction compatible with a homogenization limit

We consider a junction regulated by a traffic lights, with n incoming roads and only one outgoing road. On each road the Phase Transition traffic model, proposed in [6], describes the evolution of car traffic. Such model is an extension of the classic Lighthill-Whitham-Richards one, obtained by assuming that different drivers may have different maximal speed. By sending to infinity the number of cycles of the traffic lights, we obtain a justification of the Riemann solver introduced in [9] and in particular of the rule for determining the maximal speed in the outgoing road.Comment: 19 page

Case Studies of Environmental Visualization

The performance gap between simulation and reality has been identified as a major challenge to achieving sustainability in the Built Environment. While Post-Occupancy Evaluation (POE) surveys are an integral part of better understanding building performance, and thus addressing this issue, the importance of POE remains relatively unacknowledged within the wider Built Environment community. A possible reason that has been highlighted is that POE survey data is not easily understood and utilizable by non-expert stakeholders, including designers. A potential method by which to address this is the visualization method, which has well established benefits for communication of big datasets. This paper presents two case studies where EnViz (short for “Environmental Visualization”), a prototype software application developed for research purposes, was utilized and its effectiveness tested via a range of analysis tasks. The results are discussed and compared with those of previous work that utilized variations of the methods presented here. The paper concludes by presenting the lessons drawn from the five-year period of EnViz, emphasizing the potential of environmental visualization for decision support in environmental design and engineering for the built environment, and suggests directions for future development

Tracking Cyber Adversaries with Adaptive Indicators of Compromise

A forensics investigation after a breach often uncovers network and host indicators of compromise (IOCs) that can be deployed to sensors to allow early detection of the adversary in the future. Over time, the adversary will change tactics, techniques, and procedures (TTPs), which will also change the data generated. If the IOCs are not kept up-to-date with the adversary's new TTPs, the adversary will no longer be detected once all of the IOCs become invalid. Tracking the Known (TTK) is the problem of keeping IOCs, in this case regular expressions (regexes), up-to-date with a dynamic adversary. Our framework solves the TTK problem in an automated, cyclic fashion to bracket a previously discovered adversary. This tracking is accomplished through a data-driven approach of self-adapting a given model based on its own detection capabilities. In our initial experiments, we found that the true positive rate (TPR) of the adaptive solution degrades much less significantly over time than the naive solution, suggesting that self-updating the model allows the continued detection of positives (i.e., adversaries). The cost for this performance is in the false positive rate (FPR), which increases over time for the adaptive solution, but remains constant for the naive solution. However, the difference in overall detection performance, as measured by the area under the curve (AUC), between the two methods is negligible. This result suggests that self-updating the model over time should be done in practice to continue to detect known, evolving adversaries.Comment: This was presented at the 4th Annual Conf. on Computational Science & Computational Intelligence (CSCI'17) held Dec 14-16, 2017 in Las Vegas, Nevada, US

Benigne perivaginale Raumforderungen: Ätiologie, Diagnostik und therapeutisches Management

Einleitung: Benigne perivaginale Raumforderungen (PVRF) sind relativ selten. Treten sie auf, stellen sie in vielen Fällen eine diagnostische und therapeutische Herausforderung dar. Vielfältige, sich oftmals überlappende Symptome, sowie ein mangelndes Bewusstsein für diese seltenen Entitäten tragen maßgeblich dazu bei. Eine inkorrekte oder verspätete Diagnose kann mit Inkontinenz, Schmerzen, Rezidiven und weiteren Komplikationen einhergehen und den Leidensweg für die betroffenen Patientinnen unnötig verlängern. In seltenen Fällen kann es zu einer malignen Transformation kommen. Ziel dieser Studie ist es, ein Bewusstsein für diese Entitäten zu schaffen sowie eine akkurate Diagnostik und Versorgung aufzuzeigen. Material und Methoden: Aus den OP-Büchern der Universitätsfrauenklinik Tübingen wurden über einen Zeitraum von fünf Jahren die Art und die Anzahl der durchgeführten urogynäkologischen Eingriffe im Allgemeinen, sowie die aufgrund einer benignen PVRF erfolgten Eingriffe im Speziellen erhoben. Aus den Krankenunterlagen wurden Diagnostik, Therapie, Histologie und postoperatives Management zusammengefasst und analysiert. Vaginale Endometriosemanifestationen fanden keine Berücksichtigung. Ergebnisse: Im Zeitraum 2011-2015 wurden an unserer Klinik insgesamt 4157 Frauen einer urogynäkologischen Operation unterzogen, 65 (1,6 %) davon aufgrund benigner PVRF. Die verschiedenen Entitäten variierten erheblich in ihrer Größe, Konfiguration und Komplexität. Die größte PVRF betrug 10 cm. PVRF traten einzeln oder multipel auf. Sie waren asymptomatisch (21,2 %) oder gingen mit einem breiten Spektrum an Symptomen einher (78,8 %). Anamnese, klinische Untersuchung, Becken-boden-Sonographie, Urethrozystoskopie und MRT waren für die Diagnostik entscheidend. In allen 65 Fällen wurde die PVRF exzidiert. In einem weiteren Fall bildete sich ein Urethradivertikel vollständig unter konservativer Therapie zurück. Fazit: Anamnese, klinische Untersuchung, Beckenboden-Sonographie, Urethrozystoskopie und MRT sind essentiell für die Diagnostik benigner PVRF. Im Falle einer Infektion sollte grundsätzlich zunächst eine konservative Therapie erfolgen. Eine komplette Exzision ist bei einem chirurgischen Vorgehen die Therapiemethode der Wahl. Das Bewusstsein für und die Vertrautheit mit den verschiedenen Entitäten ist von herausragender Bedeutung für eine korrekte Diagnose und Versorgung. Als Sekundärpathologie muss auf Divertikelsteine sowie auf eine maligne Entartung geachtet werden

Lessons from the crisis: Dangers and opportunities in the Asian financial crisis

This study generates an overview of the 1997 Asian financial crisis, from its causes to the consequences. At the same time, it examines the context of the crisis, which includes the review of historical Asian development and the role of the International Monetary Fund (IMF) in the financial crisis. Particular attention is given to the crisis‘ impact on the local economy and people. In this it differs from existing research that analyses the impact on its own, this study links the crisis‘ impact to the foreign direct investment (FDI). The impact of the crisis, therefore, is reflected by examining the control power of the FDI money. It examines the crisis‘ impact through focusing on a unique angle of the two elements in the crisis – danger and opportunity. The results show that the social impact of the crisis put local people in danger of unemployment, underemployment, falling real wages and growing social inequality and lowered land and commodity prices, which dramatically reduced the cost of production. Accordingly, the control power of the FDI money increased extensively in the crisis, which represents the increasing danger of unfair exploitation of local labour and enclosure of land and resources which can be seen as opportunities beneficial to the international capitalists

The Inhibitory Effect of Pseudolaric Acid B on Gastric Cancer and Multidrug Resistance via Cox-2/PKC-α/P-gp Pathway

<div><p>Aim</p><p>To investigate the inhibitory effect of pseudolaric acid B on subcutaneous xenografts of human gastric adenocarcinoma and the underlying molecular mechanisms involved in its multidrug resistance.</p><p>Methods</p><p>Human gastric adenocarcinoma SGC7901 cells and drug-resistant SGC7901/ADR cells were injected into nude mice to establish a subcutaneous xenograft model. The effects of pseudolaric acid B with or without adriamycin treatment were compared by determining the tumor size and weight. Cyclo-oxygenase-2, protein kinaseC-α and P-glycoprotein expression levels were determined by immunohistochemistry and western blot.</p><p>Results</p><p>Pseudolaric acid B significantly suppressed the tumor growth induced by SGC7901 cells and SGC7901/ADR cells. The combination of pseudolaric acid B and the traditional chemotherapy drug adriamycin exhibited more potent inhibitory effects on the growth of gastric cancer in vivo than treatment with either pseudolaric acid B or adriamycin alone. Protein expression levels of cyclo-oxygenase-2, protein kinaseC-α and P-glycoprotein were inhibited by pseudolaric acid B alone or in combination with adriamycin in SGC7901/ADR cell xenografts.</p><p>Conclusion</p><p>Pseudolaric acid B has a significant inhibitory effect and an additive inhibitory effect in combination with adriamycin on the growth of gastric cancer in vivo, which reverses the multidrug resistance of gastric neoplasm to chemotherapy drugs by downregulating the Cox-2/PKC-α/P-gp/mdr1 signaling pathway.</p></div