bluuebunny/crossref_metadata_2025_split huggingface dataset:
Adaptive Fault–Tolerant Position Control of a Hexacopter Subject to an Unknown Motor Failure
Authors: Falconì Guillermo P. , Angelov Jorg , Holzapfel Florian 
Published: July 2018

Abstract
This paper presents a fault tolerant position tracking controller for a hexarotor system. The proposed controller has a cascaded structure composed of a position and an attitude control loop. The nominal controller is augmented by an adaptive control allocation which compensates for faults and failures within the propulsion system without reconfiguration of the controller. Simultaneously, it is able to implement a degraded control strategy which prioritizes specific control directions in the case of extreme degradation. The main contribution is a controller that is a step closer to application scenarios by including outdoor GPS-based flight tests, onboard computation and the handling of unknown degradation and failure of any rotor.
Control Strategies for the Grid Side Converter in a Wind Generation System Based on a Fuzzy Approach
Authors: Harrabi Naziha , Kharrat Maher , Aitouche Abdel , Souissi Mansour 
Published: July 2018

Abstract
Two techniques for the control of a grid side converter in a wind energy conversion system. The system is composed of a fixed pitch angle wind turbine followed by a permanent magnet synchronous generator and power electronic converters AC-DC-AC. The main interest is in how to control the inverter in order to ensure the stability of the DC link voltage. Two control methods based on the fuzzy approach are applied and compared. First, a direct Mamdani fuzzy logic controller is presented. Then, a T-S fuzzy controller is elaborated based on a T-S fuzzy model. The Lyapunov theorem and H-infinity performance are exploited for stability analysis. Besides, the feedback controller gains are determined using linear matrix inequality tools. Simulation results are derived in order to prove the robustness of the proposed control algorithms and to compare their performances.
Analysis of Positive Linear Continuous–Time Systems Using the Conformable Derivative
Authors: Kaczorek Tadeusz 
Published: July 2018

Abstract
Positive linear continuous-time systems are analyzed via conformable fractional calculus. A solution to a fractional linear system is derived. Necessary and sufficient conditions for the positivity of linear systems are established. Necessary and sufficient conditions for the asymptotic stability of positive linear systems are also given. The solutions of positive fractional linear systems based on the Caputo and conformable definitions are compared.
Transient Flow in Gas Networks: Traveling waves
Authors: Gugat Martin , Wintergerst David 
Published: July 2018

Abstract
In the context of gas transportation, analytical solutions are helpful for the understanding of the underlying dynamics governed by a system of partial differential equations. We derive traveling wave solutions for the one-dimensional isothermal Euler equations, where an affine linear compressibility factor is used to describe the correlation between density and pressure. We show that, for this compressibility factor model, traveling wave solutions blow up in finite time. We then extend our analysis to networks under appropriate coupling conditions and derive compatibility conditions for the network nodes such that the traveling waves can travel through the nodes. Our result allows us to obtain an explicit solution for a certain optimal boundary control problem for the pipeline flow.
Simultaneous Disturbance Compensation and H1/H∞ Optimization In Fault Detection Of UAVs
Authors: Liu Hai , Zhong Maiying , Yang Rui 
Published: July 2018

Abstract
This paper deals with the problem of robust fault detection (FD) for an unmanned aerial vehicle (UAV) flight control system (FCS). A nonlinear model to describe the UAV longitudinal motions is introduced, in which multiple sources of disturbances include wind effects, modeling errors and sensor noises are classified into groups. Then the FD problem is formulated as fault detection filter (FDF) design for a kind of nonlinear discrete time varying systems subject to multiple disturbances. In order to achieve robust FD performance against multiple disturbances, simultaneous disturbance compensation and H1/H∞ optimization are carried out in designing the FDF. The optimality of the proposed FDF is shown in detail. Finally, both simulations and real flight data are applied to validate the proposed method. An improvement of FD performance is achieved compared with the conventional H1/H∞-FDF.
Analysis of an N–Policy GI/M/1 Queue in a Multi–Phase Service Environmentwith Disasters
Authors: Jiang Tao , Ammar Sherif I. , Chang Baoxian , Liu Liwei 
Published: July 2018

Abstract
This paper investigates an N-policy GI/M/1 queue in a multi-phase service environment with disasters, where the system tends to suffer from disastrous failures while it is in operative service environments, making all present customers leave the system simultaneously and the server stop working completely. As soon as the number of customers in the queue reaches a threshold value, the server resumes its service and moves to the appropriate operative service environment immediately with some probability. We derive the stationary queue length distribution, which is then used for the computation of the Laplace-Stieltjes transform of the sojourn time of an arbitrary customer and the server’s working time in a cycle. In addition, some numerical examples are provided to illustrate the impact of several model parameters on the performance measures.
Closest Paths in Graph Drawings under an Elastic Metric
Authors: Baran Mateusz 
Published: July 2018

Abstract
This work extends the dynamic programming approach to calculation of an elastic metric between two curves to finding paths in pairs of graph drawings that are closest under this metric. The new algorithm effectively solves this problem when all paths between two given nodes in one of these graphs have the same length. It is then applied to the problem of pattern recognition constrained by a superpixel segmentation. Segmentations of test images, obtained without statistical modeling given two shape endpoints, have good accuracy.
Facial Expression Recognition under Difficult Conditions: A Comprehensive Study on Edge Directional Texture Patterns
Authors: Ahmed Faisal , Kabir Md. Hasanul 
Published: July 2018

Abstract
In recent years, research in automated facial expression recognition has attained significant attention for its potential applicability in human-computer interaction, surveillance systems, animation, and consumer electronics. However, recognition in uncontrolled environments under the presence of illumination and pose variations, low-resolution video, occlusion, and random noise is still a challenging research problem. In this paper, we investigate recognition of facial expression in difficult conditions by means of an effective facial feature descriptor, namely the directional ternary pattern (DTP). Given a face image, the DTP operator describes the facial feature by quantizing the eight-directional edge response values, capturing essential texture properties, such as presence of edges, corners, points, lines, etc. We also present an enhancement of the basic DTP encoding method, namely the compressed DTP (cDTP) that can describe the local texture more effectively with fewer features. The recognition performances of the proposed DTP and cDTP descriptors are evaluated using the Cohn-Kanade (CK) and the Japanese female facial expression (JAFFE) database. In our experiments, we simulate difficult conditions using original database images with lighting variations, low-resolution images obtained by down-sampling the original, and images corrupted with Gaussian noise. In all cases, the proposed method outperforms some of the well-known face feature descriptors.
Social Infrastructure Services for Promoting Local Community Wellbeing in Lithuania
Authors: Vaznonienė Gintarė , Kiaušienė Ilona 
Published: July 2018

Abstract
Social infrastructure is largely related to various services for community, facilities and public spaces, relationships and networks among local community members. It is therefore obvious that social infrastructure could be viewed as an important factor for creating better opportunities for integration and participation in society, fostering functional capabilities of a community, acknowledging human rights, improving judgements related to overall life satisfaction. The links between social infrastructure services and focus on local community wellbeing in Lithuanian’s social science discourse has not been substantiated sufficiently yet. Consequently, this article aims at disclosing the importance of social infrastructure services in promotion of local community wellbeing. The research question of this article is formulated as follows: how social infrastructure services contribute and could promote wellbeing of local community. The methodological background is based on both theoretical and empirical findings pertaining to the topic. The research results have suggested that the need of local community for social infrastructure services should be evaluated more carefully in the context of wellbeing. These services have been found to play significant role in reaching a certain level of wellbeing in view of the place where people live, how they feel and how to evaluate the future of their living.
Novel approaches of data-mining in experimental physics
Authors: Ososkov Gennady A. 
Published: July 2018

ABSTRACT
Data mining for processing experimental data in high energy and nuclear physics led to many multiparametric problems, two of them are considered: (i) hypothesis testing and classification approaches based on artificial neural networks and boosted decision trees (ii) clustering of large amounts of data by so-called growing neural gas. Some examples from the practice of the Joint Institute for Nuclear Research are given to show how to prepare data to deal with those approaches.
Analisis Reveal dan Stated Preference Terhadap Atribut Travel Time dan Travel Cost Pada Kompetisi Moda Bus dan Kereta Api: Studi Kasus Malaysia
Authors: Roza Angelalia , Rusli Andy Mulya , Karim Mohamed Rehan 
Published: July 2018

Penelitian ini bertujuan untuk menganalisa kompetisi moda angkutan umum darat antarkota di negara berkembang seperti Malaysia, terkait atribut travel time dan travel cost. Kajian ini menjadi penting karena kebijakan infrastuktur di negara berkembang seperti realisasi double tracking project ETS di Malaysia, berpotensi menimbulkan persaingan moda khususnya bus dan kereta api, terkait dua atribut tersebut. Pendekatan analisis dilakukan menggunakan reveal preference method yang dipertajam dengan stated preference method. Tingginya kompetisi moda angkutan umum darat antarkota ini memungkinkan terjadinya mode shift, yang dapat diprediksi melalui preferensi dan persepsi pengguna moda. Preferensi dan persepsi pengguna moda bus antarkota dideskripsikan dengan memunculkan analisis sensitivitas terhadap 12.000 data set. Melalui analisis sensitivitas, dijumpai adanya perbedaan persepsi pengguna bus terhadap kebijakan penyedia jasa dalam perubahan nilai utilitas kedua moda tersebut. Temuan studi ini menarik, dimana reduksi travel time dan penurunan travel cost yang sama pada kedua moda, belum tentu menghasilkan persentase mode shift yang sama. Pengguna bus terlihat kurang begitu responsif terhadap pengurangan travel time maupun travel cost moda saingannya. Sebaliknya, pengguna bus antarkota lebih khawatir terhadap bertambahnya travel cost dan travel time moda mereka (bus). Diharapkan kajian ini menjadi pertimbangan bagi pembuat kebijakan agar pembangunan infrastruktur lebih tepat sasaran menuju terciptanya balance mode share. Terutama bagi kebijakan yang menimbulkan persaingan angkutan umum darat antarkota di masa depan.Kata kunci : Metoda stated preference, Reveal preference, Preferensi moda bus antarkota, Analisis sensitivitas.
Perbedaan Desain Tulangan Elemen Struktur Beton Bertulang Berdasarkan Jenis Tanah Pada SNI-1726-2002
Authors: Yoresta Fengky S. 
Published: July 2018

Runtuhnya bangunan menjadi penyebab utama banyaknya korban jiwa saat terjadi gempa. Peraturan gempa 2002 (SNI–1726–2002) telah mengatur tata-tata cara desain ketahanan struktur gedung terhadap gempa dengan membagi kondisi tanah menjadi tiga (tanah lunak, sedang, dan keras) pada respon spektrum gempa rencana. Penelitian ini bertujuan menentukan pengaruh ketiga jenis tanah tersebut terhadap desain tulangan elemen struktur. Sebuah struktur beton bertulang dimodelkan sebagai gedung parkir yang berlokasi di wilayah gempa 4. Hasil analisis dan desain (berdasarkan SNI 03-2847-2002) menunjukkan bahwa kebutuhan tulangan terbesar pada balok maupun kolom terdapat pada struktur dengan kondisi tanah lunak. Sementara kebutuhan tulangan yang paling kecil terdapat pada kondisi tanah keras. Perbedaan keduanya bahkan mencapai dua kali lipat untuk balok, dan tiga kali lipat untuk kolom. Kata kunci : balok, beton bertulang, desain tulangan, ketahanan gempa, kolom
Aplikasi Metode Eksperimen Response Surface Untuk Mengoptimalkan Kuat Tekan Bata Non Bakar
Authors: Fajrin Jauhar , Hariyadi Hariyadi , Marchelina Nadella 
Published: July 2018

Sebagai bahan bangunan yang relatif masih baru, komposisi bahan penyusun bata non-bakar masih menjadi topik yang menarik untuk diteliti. Pada beberapa studi sebelumnya upaya mencari komposisi optimum campuran bata non bakar menggunakan metode eksperimen yang mengevaluasi pengaruh sebuah faktor dalam satu kali eksperimen atau yang dikenal dengan istilah single factor experiment. Kelemahan dari metode eksperimen ini adalah kesimpulan yang dihasilkan hanya terkait dengan satu faktor yang diamati itu saja. Sementara dalam kenyataannya, hasil dari sebuah proses tidak hanya dipengaruhi oleh satu faktor saja melainkan dipengaruhi oleh banyak faktor termasuk interaksinya. Studi ini dilakukan untuk mencari komposisi optimum bahan penyusun bata non bakar dengan menerapkan metode respon permukaan (Response Surface Method). Proses analisa data dilakukan dengan menggunakan software Minitab 17. Hasil penelitian menunjukan bahwa proporsi bahan yang menghasilkan kuat tekan paling optimal adalah semen (21,034%), pasir (28,9651%) dan tanah liat (50%), yang mampu menghasilkan bata non bakar dengan kuat tekan rata-rata sebesar 50.22 kg/cm2. Hasil penelitian ini juga merekomendasikan sebuah persamaan umum untuk memprediksi kuat tekan bata non bakar apabila menggunakan ketiga komposisi bahan tersebut, yaitu: y=-5,56x1+0,141x2+0,541x3+0,214x1 x2+0,0473x1 x_x-0,307x2 dengan x1, x2 dan x3 masing-masing adalah proporsi semen, pasir dan tanah liat.
Persepsi Owner Terhadap Kompetensi Manajemen Kontraktor Jalan di Sumatera Barat
Authors: Repadi Evita Kartikaratu , Yosritzal Yosritzal , Purnawan Purnawan 
Published: July 2018

Dalam menunjang keberhasilan pembangunan infrastruktur, maka diperlukan kerja sama yang baik antara owner, kontraktor dan konsultan yang harus didukung dengan penerapan sistem manajemen proyek. Beberapa penyebab keterlambatan penyelesaian proyek pada Dinas Prasarana Jalan, Tataruang dan Permukiman Prov. Sumbar berhubungan dengan penerapan sistem manajemen proyek yang masih rendah, Penelitian ini bertujuan untuk mengidentifikasi faktor-faktor yang berpengaruh terhadap kinerja manajemen proyek kontraktor jalan untuk paket non kecil di Prov. Sumatera Barat, mengetahui persepsi owner terhadap penyedia jasa konstruksi dan memberikan gambaran mengenai kinerja manajemen proyek yang perlu ditingkatkan kinerjanya oleh kontraktor nonkecil jalan di Prov. Sumatera Barat. Dari penelitian ini teridentifikasi terdapat 9 faktor yang mempengaruhi kompetensi manajemen kontraktor jalan, Melalui metode CSI diketahui nilai Customer Satisfaction Index (CSI) sebesar 69% yang terletak pada rentang nilai antara 65% < CSI ≤ 80%) yaitu level ke IV (Puas) sehingga Owner merasa puas terhadap kompetensi manajemen kontraktor paket nonkecil yang bekerjasama dengan Dinas Prasarana Jalan, Tataruang dan Permukiman Provinsi Sumatera Barat, Dengan Metode Requirement Satisfacton Analysis yaitu metode kuadran dan gap analysis diketahui terdapat 3 faktor yang menjadi fokus dalam perbaikan yaitu faktor sistem manajemen pelaksanaan jalan, faktor administrasi dan dokumentasi dan faktor sumber daya. Faktor administrasi dan dokumentasi adalah faktor yang memiliki Gap (selisih nilai) kebutuhan dan kepuasan yang paling besar sehingga menjadi faktor yang paling prioritas untuk ditingkatkan kinerjanya karena sangat berpengaruh terhadap kinerja kompetensi manajemen kontraktor jalan untuk paket nonkecil di Provinsi Sumatera Barat.
Perencanaan Sistem Struktur Balok Beton Pracetak Hibrida
Authors: Yudi Ahmad 
Published: July 2018

Penelitian ini mencakup analisis dan perencanaan sistem balok beton pracetak hibrida, sebagai sejenis beton pracetak yang menggunakan kabel prategang unbonded sebagai tambahan perkuatan pada sambungan struktur balok. Pada penelitian ini model struktur dibuat dengan portal terbuka tiga dimensi berupa struktur balok dan kolom. Struktur didesain dengan beban hidup, beban mati, beban gempa respons spektra dan beban gempa time history, dengan beban tersebut diperoleh kinerja struktur sistem beton pracetak hibrida dapat menahan beban gempa dari percepatan awal gempa sebesar 0.364 g dapat dinaikan sampai 2.8 kalinya sebelum runtuh. Penambahan tendon unbonded tersebut memberikan efek pemulih-pusatan (self-centering effect) yang merobah lup histerisis yang pada umumnya berbentuk jajaran genjang menjadi bentuk bendera (flag shape hysteresis), dimana bentuk bendera menunjukkan perlawanan elastis sebagai tambahan terhadap perlawanan momen pada sambungan. Selain itu, tulisan ini juga membahas perbedaan kurva histerisis untuk nilai self-centering rasio λ yang berbeda-beda dari 1, 0.5 dan 0. Dengan nilai dari self-centering rasio yang berbeda-beda tersebut, dihasilkan bentuk kurva histeresis yang berbeda-beda pula. Pada akhirnya, dari perbedaan kurva histeresis tersebut, dapat digambarkan perbedaan dari kapasitas penampang dengan self-centering rasio yang memberikan peningkatan kapasitas momen dari yang menggunakan tulangan biasa, kabel prategang unbonded, dan gabungan keduanya. Pada penelitian ini dibuat perlangkah dalam perencanaan struktur khususnya balok sehingga dapat menjadi acuan dalam mendesain struktur pracetak hibrida.
Analysis of The Impact of Free Trade Agreements Policy on International Palm Oil Trade Flows
Authors: Pujiati Riska 
Published: July 2018

Pertanian memainkan peran penting bagi negara-negara berkembang, sebagian besar negara berkembang mengekspor bahan mentah ke pasar internasional sebagai sumber pendapatan utama. Kawasan Asia Tenggara adalah wilayah yang memiliki banyak negara berkembang dengan pendapatan menengah, dengan dua negara yang menjadi eksportir minyak sawit utama, yaitu Indonesia dan Malaysia. Minyak kelapa sawit diekspor sebagai dua bentuk utama, crude dan refined. Kelapa sawit memiliki nilai yang tinggi di pasar internasional dan diekspor ke lebih dari 50 negara dan memiliki banyak turunan. Perkembangan terakhir dari kebijakan perdagangan internasional untuk Indonesia dan Malaysia adalah pembentukan perjanjian perdagangan bebas (Free Trade Agreements), baik bilateral maupun regional. Sebagai produsen utama, bergabung dalam perjanjian perdagangan bebas menjadi peluang bagi Indonesia dan Malaysia untuk mempromosikan perdagangan karena mengurangi hambatan perdagangan. Meskipun Indonesia dan Malaysia memperdagangkan komoditas yang serupa, keterlibatan dalam perjanjian perdagangan bebas akan memberikan hasil yang berbeda dalam aliran perdagangan. Berdasarkan latar belakang tersebut, tujuan dari penelitian ini adalah untuk menganalisis dampak penerapan kebijakan perjanjian perdagangan bebas terhadap aliran perdagangan kelapa sawit Indonesia dan Malaysia. Model Gravitasi dengan Regresi Poisson Pseudo Maximum Likelihood (PPML) digunakan untuk mengukur perubahan aliran perdagangan kelapa sawit. Hasil regresi menunjukkan dampak positif dari FTA terhadap Indonesia dan Malaysia berdasarkan jenis minyak sawit
Gout and the Risk of Incident Erectile Dysfunction: A Body Mass Index-matched Population-based Study
Authors: Schlesinger Naomi , Lu Na , Choi Hyon K. 
Published: July 2018

Objective.Gout is the most common inflammatory arthritis. Erectile dysfunction (ED) is common in the general population; however, evidence regarding ED among patients with gout is limited. Our purpose was to study the association between incident gout and the risk of incident ED in the general population.Methods.We conducted a cohort study using The Health Improvement Network, an electronic medical record database in the United Kingdom. Up to 5 individuals without gout were matched to each case of incident gout by age, enrollment time, and body mass index (BMI). Multivariate HR for ED were calculated after adjusting for smoking, alcohol consumption, comorbidities, and medication use.Results.We identified 2290 new cases of ED among 38,438 patients with gout (mean age 63.6 yrs) and 8447 cases among 154,332 individuals in the comparison cohort over a 5-year median followup (11.9 vs 10.5 per 1000 person-years, respectively). Univariate (matched for age, entry time, and BMI) and multivariate HR for ED among patients with gout were 1.13 (95% CI 1.08–1.19) and 1.15 (95% CI 1.09–1.21), respectively. In our sensitivity analysis, by restricting gout cases to those receiving anti-gout treatment (n = 27,718), the magnitude of relative risk was stronger than the primary analysis (multivariate HR 1.31, 95% CI 1.23–1.39).Conclusion.This population-based study suggests that gout is associated with an increased risk of developing ED, supporting a possible role for hyperuricemia and inflammation as independent risk factors for ED.
Antiphosphatidylserine/prothrombin Antibodies in Antiphospholipid Syndrome with Intrauterine Growth Restriction and Preeclampsia
Authors: Canti Valentina , Del Rosso Stefania , Tonello Marta , Lucianò Roberta , Hoxha Ariela , Coletto Lavinia A. , Vaglio Tessitore Isadora , Rosa Susanna , Manfredi Angelo A. , Castiglioni Maria Teresa , Ruffatti Amelia , Rovere-Querini Patrizia 
Published: July 2018

Objective.Antibodies that recognize the phosphatidylserine/prothrombin complex (antiphosphatidylserine/prothrombin antibodies; aPS/PT) might reveal enhanced thrombotic risk in patients with systemic lupus erythematosus. Little is known about their association with pregnancy complications in the antiphospholipid syndrome (APS).Methods.We enrolled 55 patients with APS who were seeking pregnancy in 2 Italian hospitals. Antiphospholipid antibodies (aPL), including anticardiolipin antibodies, anti-β2-glycoprotein I antibodies, lupus-like anticoagulant, and aPS/PT antibodies were assessed, and the patients were prospectively followed for 24 months.Results.There were 65% (36/55) of the APS patients who had aPS/PT antibodies. Forty-seven pregnancies were followed, including 33 of aPS/PT+ patients. Forty-one of the 47 patients (87%) who initiated a pregnancy eventually gave birth to a child. The pregnancy duration and the mean newborn weight at delivery were significantly lower in aPS/PT+ than in aPS/PT− patients (33.1 ± 4.7 vs 36.2 ± 3.4 wks of gestation, respectively, and 2058 ± 964 g vs 2784 ± 746 g, respectively, p < 0.05). Late pregnancy complications, including intrauterine fetal death, preterm delivery, preeclampsia, and intrauterine growth restriction (IUGR), were more frequent in aPS/PT+ patients, independent of the therapy. Titers of aPS/PT IgG were significantly inversely correlated with the neonatal weight at delivery. Vascular injury, as reflected by thrombosis, fibrinoid necrosis, ischemic and hemorrhagic areas, and presence of chorangiomas characterized the IUGR placentas in the presence of aPS/PT.Conclusion.The aPS/PT antibodies might represent markers of aPL-related pregnancy complications, IUGR/preeclampsia in particular, and could help identify beforehand patients who may require additional treatment.