Orthogonal parallel MCMC methods for sampling and optimization

Monte Carlo (MC) methods are widely used for Bayesian inference and optimization in statistics, signal processing and machine learning. A well-known class of MC methods are Markov Chain Monte Carlo (MCMC) algorithms. In order to foster better exploration of the state space, specially in high-dimensional applications, several schemes employing multiple parallel MCMC chains have been recently introduced. In this work, we describe a novel parallel interacting MCMC scheme, called {\it orthogonal MCMC} (O-MCMC), where a set of "vertical" parallel MCMC chains share information using some "horizontal" MCMC techniques working on the entire population of current states. More specifically, the vertical chains are led by random-walk proposals, whereas the horizontal MCMC techniques employ independent proposals, thus allowing an efficient combination of global exploration and local approximation. The interaction is contained in these horizontal iterations. Within the analysis of different implementations of O-MCMC, novel schemes in order to reduce the overall computational cost of parallel multiple try Metropolis (MTM) chains are also presented. Furthermore, a modified version of O-MCMC for optimization is provided by considering parallel simulated annealing (SA) algorithms. Numerical results show the advantages of the proposed sampling scheme in terms of efficiency in the estimation, as well as robustness in terms of independence with respect to initial values and the choice of the parameters

Identifying wave packet fractional revivals by means of information entropy

Wave packet fractional revivals is a relevant feature in the long time scale evolution of a wide range of physical systems, including atoms, molecules and nonlinear systems. We show that the sum of information entropies in both position and momentum conjugate spaces is an indicator of fractional revivals by analyzing three different model systems: $(i)$ the infinite square well, $(ii)$ a particle bouncing vertically against a wall in a gravitational field, and $(iii)$ the vibrational dynamics of hydrogen iodide molecules. This description in terms of information entropies complements the usual one in terms of the autocorrelation function

Analisis Kompetensi Pedagogik Guru Paudni di Kecamata Pontianak Barat

This research in focus on to competence pedagogical teachers PAUDNI in Kecamatan Pontianak West. In general the purpose of this research is to know competence pedagogical teachers paudni , in especially this study aims to described competence pedagogical teachers paudni in planning learning , described competence pedagogical teachers paudni implement learning and described competence pedagogical teachers paudni evaluate learning. Methods used is the method research quantitative with the form of the research descriptive. The calculation on average score competence pedagogical from a source data 54 teachers paudni in planning learning have the ability categories being, competence pedagogical teachers paudni in implementing learning have the ability categories and and competence pedagogical teachers paudni in evaluate learning having categories being .Competence pedagogical teachers paudni in kecamatan pontianak west inferred to have categories was in planning , implement and evaluate learning early childhood

Structure of the lightest scalar meson from the 1/Nc expansion of Unitarized Chiral Perturbation Theory and Regge Theory

One-loop unitarized Chiral Perturbation Theory (UChPT) calculations, suggest a different Nc behaviour for the sigma or f_0(600) and rho(770) mesons: while the rho meson becomes narrower with Nc, as is expected for a q-qbar meson, the sigma becomes broader, and its contribution to the total cross section is less and less important. On the other hand, local duality requires a cancellation between the sigma and rho amplitudes, but if there is a different Nc behaviour for them, there is a possible contradiction between the Inverse Amplitude Method (IAM) and local duality for large Nc. However, next to next to leading order UChPT calculations suggested a subdominant q-qbar component for the sigma with a mass around 1.2 GeV. In this work, we show that this subdominant q-qbar component is indeed needed to ensure local duality.Comment: To appear in the Proceedings of the Hadron09 International Conference. 29th Nov-4th Dec. 2009. Tallahassee, FL, USA. 5 page

Parallel Metropolis chains with cooperative adaptation

Monte Carlo methods, such as Markov chain Monte Carlo (MCMC) algorithms, have become very popular in signal processing over the last years. In this work, we introduce a novel MCMC scheme where parallel MCMC chains interact, adapting cooperatively the parameters of their proposal functions. Furthermore, the novel algorithm distributes the computational effort adaptively, rewarding the chains which are providing better performance and, possibly even stopping other ones. These extinct chains can be reactivated if the algorithm considers necessary. Numerical simulations shows the benefits of the novel scheme

Analysis of broadband microwave conductivity and permittivity measurements of semiconducting materials

We perform broadband phase sensitive measurements of the reflection coefficient from 45 MHz up to 20 GHz employing a vector network analyzer with a 2.4 mm coaxial sensor which is terminated by the sample under test. While the material parameters (conductivity and permittivity) can be easily extracted from the obtained impedance data if the sample is metallic, no direct solution is possible if the material under investigation is an insulator. Focusing on doped semiconductors with largely varying conductivity, here we present a closed calibration and evaluation procedure for frequencies up to 5 GHz, based on the rigorous solution for the electromagnetic field distribution inside the sample combined with the variational principle; basically no limiting assumptions are necessary. A simple static model based on the electric current distribution proves to yield the same frequency dependence of the complex conductivity up to 1 GHz. After a critical discussion we apply the developed method to the hopping transport in Si:P at temperature down to 1 K.Comment: 9 pages, 10 figures, accepted for publication in the Journal of Applied Physic

Faktor-faktor yang Mempengaruhi Akseptor Lebih Memilih Jenis Kontrasepsi Suntik Satu Bulan (Syclofem) di Rb Mariana Tahun 2016

Menurut World Health Organization (WHO) keluarga berencana adalah tindakan yang membantu individu atau pasangan suami isteri untuk menghindari kelahiran yang tidak diinginkan. Dari hasil wawancara yang dilakukan pada 5 orang responden, seluruh responden berusia 20 – 35 tahun, diketahui dari seluruh responden lebih banyak memilih jenis kontrasepsi suntik 1 bulan dikarenakan tidak mengganggu siklus haid dan mengatakan bahwa siklus haidnya teratur setiap bulannya. Untuk mengetahui faktor- faktor yang mempengaruhi Akseptor lebih memilih jenis kontrasepsi suntik 1 bulan yaitu : Faktor Internal meliputi :Usia, Agama, Paritas, Pengetahuan, Pendidikan, Ekonomi: Faktor Eksternal meliputi :Efektivitas, Efek samping,Budaya, Lingkungan. Penelitian ini menggunakan metode deskriptif kolerasi dengan pendekatan cross sectional. Dari hasil penelitian didapatkan pada usia sekitar 20 – 35 tahun 79,2%, pada agama, agama islam 52,1%, pendidikan menengah (SMP-SMA) ada 47,9%, pada pekerjaan yang tidak bekerja ada 95,8%, pada paritas yang menjawab tidak ada 91,7%, pada tingkat pengetahuan yang menjawab ya 100%, pada tingkat ekonomi yang menjawab ya ada 100%, pada efektivitas yang menjawab ya berjumlah 100%, pada efek samping yang menjawab ya berjumlah 100%, pada budaya yang memilih jawaban tidak 100%, pada lingkungan yang menjawab tidak ada 93,8%. Berdasarkan dari penelitian didapatkan hasil tidak ada hubungan antara usia dengan suntik satu bulan. Pada agama, tidak ada hubungan antara agama dengan suntik satu bulan. Tingkat pendidikan tidak ada hubungan antara pendidikan dengan suntik satu bulan. Tingkat pekerjaan tidak ada hubungan antara pekerjaan dengan suntik satu bulan. Tingkat paritas artinya tidak ada hubungan antara paritas dengan suntik satu bulan. Pengetahuan tidak ada hubungan antara pengetahuan dengan suntik satu bulan. Tingkat ekonomi tidak ada hubungan antara ekonomi dengan suntik satu bulan. Pada efektivitas artinya tidak ada hubungan antara efektivitas dengan suntik satu bulan. Tingkat efek samping ada hubungan antara efek samping dengan suntik satu bulan. Pada budaya tidak ada hubungan antara budaya dengan suntik satu bulan. Pada lingkungan tidak ada hubungan antara lingkungan dengan suntik satu bulan. Hasil dari penelitian ini dapat memberikan informasi khususnya kepada pengguna KB untuk tidak hanya menggunakan KB suntik 1 bulan saja, masih banyak alat kontrasepsi yang lainnya yang tidak memiliki efek samping yang sedikit

Reconciling threshold and subthreshold expansions for pion-nucleon scattering

Heavy-baryon chiral perturbation theory (ChPT) at one loop fails in relating the pion-nucleon amplitude in the physical region and for subthreshold kinematics due to loop effects enhanced by large low-energy constants. Studying the chiral convergence of threshold and subthreshold parameters up to fourth order in the small-scale expansion, we address the question to what extent this tension can be mitigated by including the $\Delta(1232)$ as an explicit degree of freedom and/or using a covariant formulation of baryon ChPT. We find that the inclusion of the $\Delta$ indeed reduces the low-energy constants to more natural values and thereby improves consistency between threshold and subthreshold kinematics. In addition, even in the $\Delta$-less theory the resummation of $1/m_N$ corrections in the covariant scheme improves the results markedly over the heavy-baryon formulation, in line with previous observations in the single-baryon sector of ChPT that so far have evaded a profound theoretical explanation.Comment: 10 pages, 4 tables, Mathematica notebook with the analytic expressions for threshold and subthreshold parameters included as supplementary material; journal versio

Production of hydroxyparaconic and itatartaric acids by genus Ustilago

Thesis--University of Tsukuba, D.Agr.(A), no. 800, 1990. 10. 3

Analysis of Corporate Social Responsibility Implementation and Social Audit at PT Semen Padang

This study describes the implementation of CSR and social audit in PT Semen Padang. PT Semen Padang as one of the largest states owned enterprise in West Sumatra has a big hand in the development of West Sumatra. Analyses were performed with descriptive statistics and content analysis. The data analysis on the CSR activities of PT Semen Padang was done by performing content analysis on the audited company's annual report. Results of the analysis showed CSR's model implementation in PT. Semen Padang is on the form of physical development such as public facilities, education development, employment empowerment, economic empowerment, community services, public health services, environmental protection, sports, and the arts. A form of implementation of CSR programs is generally done directly and independently by a company-appointed team. PT Semen Padang has not purely implemented social audit of the CSR report, but it has integrated in the audit of the company's annual report