bluuebunny/crossref_metadata_2025 huggingface dataset:
توظيف انشطة ادارة المعرفة كأفضل مسار معرفي لتمثيل الذكاء الاصطناعي / دراسة تحليلية وصفية للنشاطات المعرفية في جامعة دهوك
Authors: الاشقر سيف
Published: October 2018

استهدف البحث التركيز على الأنشطة الأساسية في ادارة المعرفة ، وهي: (الاستحواذ والاختيار والتوليد والاستيعاب والنشر) التي تعالج المعرفة بأعتماد الذكاء الاصطناعي

(AI) Intelligence Artificia

(العمل،/Episodic الذي يعد قاطرة التطور البشري القادم ويحكم القيام بتنفيذ حالات إدارة المعرفة لتتبنى (الحدث

  لكي يتناول المعرفة أثناء العمل، وبعبارة أخرى، فإن تنفيذ انشطة إدارة المعرفة بأعتماد وتوظيف تقنيات الذكاء الاصطناعي في كافة القطاعات الاقتصادية ،تعكس مجموعة وقائع تختلف في هيكلها ووظائفها وأغراضها وتتفرع في حالات مختلفة لتحقق مدى من المهام المختلفة وفقاً للجهود البحثية التي تطرحها ، ولما كانت المنظمة في حقيقتها تعيش على المعرفة وتتطور وتنمو باستخدام افرادها للجديد والمتطور منها، كأعتماد أنظمة الذكاء الاصطناعي في تنفيذها ، اذ تنتهي حياة المنظمة بتعذر الحصول على الموارد المعرفية اللازمة لاستمرارها ، ولغرض الحصول على هذه الموارد المعرفية يحتاج المورد البشري في المنظمة إلى تقنيات توفر مزيدا من الخيارات والتسهيلات للمستخدمين للتعامل مع التكنولوجيا الحديثة، يقودها الذكاء الاصطناعي فهو لا يوفر الفهم الواسع لظاهرة إدارة المعرفة حسب بل يعمل كوسيلة لبقاء المنظمات واستمرارها .

وعليه تم القيام بدراسة استطلاعية اولية في جامعة دهوك في العراق خلال المدة (2-30/5/ 2018)  لتمثل عينة البحث، من خلال اعتماد استمارة الاستبانة بغرض تشخيص البعد الأكثر تاثيرا منها من خلال الاعتماد على البرمجية الجاهزة SPSS .ولتحقيق ذلك تم اعداد مخطط افتراضي يتضمن متغيرات البحث ,فضلا عن صياغة عدد من الفرضيات الرئيسة والفرعية تم اختبارها من خلال عدد من الاساليب الاحصائية  . وقد تم توزيع (40) استمارة  لغرض التحليل.وقد توصل البحث الى مجموعة من الاستنتاجات كان ابرزها : نتائج الاختبار الاحصائي (T-Test) ان جامعة دهوك قد استجابت وبسنة جيدة لاعتماد نشاطات إدارة المعرفة ومعالجتها بأعتماد تقنيات الذكاء الاصطناعي ،وقد تم تقديم عدد من التوصيات المتوافقة مع تلك الاستنتاجات
Gambaran Kualitas Fisik Lingkungan pada Ruang Dosen Gedung B PSDKU Universitas Airlangga
Authors: Yhuwono Yogi , P Septa Indra
Published: October 2018

Kondisi fisik lingkungan ruang yang tidak baik dapat menimbulkan risiko gangguan kesehatan berupa Sick Building Syndrome. Ruang dosen berpotensi mengalami masalah kualitas fisik lingkungan yang berdampak pada penghuninya karena banyak terdapat perabotan, tumpukan buku, perkakas, serta tingginya aktivitas perkantoran.Tujuan penelitian ini adalah untuk mengukur kualitas fisik lingkungan dan menggambarkan karakteristik ruang dosen gedung B PSDKU Universitas Airlangga di Banyuwangi. Penelitian ini merupakan penelitian observasional yang dianalisis secara deskriptif dengan pengumpulan data primer berupa pengamatan karakteristik ruangan, pengukuran temperatur, kelembaban, pencahayaan, dan kebisingan. Hasil penelitian menunjukkan bahwa kelembaban (50,6%), pencahayaan (130,12 lux), dan kebisingan (52,18 dBA) telah memenuhi persyaratan baku mutu, sedangkan parameter temperatur sebesar 30 0C melebihi dari persyaratan sesuai regulasi yaitu 18-28 0C. Disarankan melakukan perbaikan temperatur ruangan dengan pengendalian melalui penambahan ventilasi ruangan, baik alami maupun buatan.
Hubungan Sosiodemografi Orang Tua dengan Sikap Remaja Tentang Kesehatan Reproduksi Remaja
Authors: Solehati Tetti , Kosasih Cecep Eli , Rahmat Agus
Published: October 2018

Sosiodemografi orang tua memiliki peranan yang cukup besar dalam membentuk sikap anak remaja, salah satunya sikap anak remaja tentang kesehatan reproduksi remaja (KRR). Tujuan penelitian untuk mengetahui hubungan sosiodemografi orang tua terhad sikap remaja tentang KRR. Rancangan penelitian cross sectional. Pengumpulan data dilakukan melalui pengisian instrumen quisioner. Data dianalisa menggunakan Chi Squere. Penelitian dilakukan tahun 2017 di SMPN dan SMAN wilayah Kabupaten Bandung. Populasi penelitian ini adalah seluruh siswa SMP dan SMA yang digunakan sebagai lokasi penelitian sejumlah 12.000. Sample berjumlah 668 siswa menggunakan rumus Slovin. Tehnik pengambilan sample dengan stratified random sampling. Hasil penelitian diperoleh bahwa Variabel sikap berhubungan dengan pekerjaan orang tua (p=0,000), pendidikan orang tua (p=0,000), dan pendapatan keluarga (p=0,000). Kesimpulan: sosiodemografi orang tua memiliki hubungan dengan sikap pada anak remaja. Berdasarkan hasil penelitian dan pembahasan, disarankan agar orang tua dapat menjalankan perannya sebagai pengendali sikap anak remaja dalam mendukung perilaku anak remaja terhadap kesehatan reproduksi remaja.
How Long is the Safest InterDelivery Interval in Women with Previous History of Cesarean Delivery?
Authors: Santoso Budi I , Surya Raymond , Firdaus Karina K , Hakim Surahman
Published: October 2018

Objective: To investigate the association between interdelivery interval and uterine rupture in women with previous CD.

 

Methods: The formulation question was how long is the safest interdeliveryinterval to minimalize the risk of uterine rupture. Theauthors investigated in three databases including Pubmed,Cochrane, and Embase database. Inclusion criteria wereabstract answering the clinical question, written in Englishlanguage, and full-text paper availability.

 

Results: One systematic review, six cohort studies, and 1 casecontrolstudy were collected to compare the inter-pregnancyinterval to the risk of uterine rupture. The author retrievedseven articles suitable to the inclusion criteria after excluding tenarticles screened by the abstract and language. Then, the authoradded one article used in the systematic review. Hence, the criticalappraisal based on Validity, Importance, and Applicability (VIA)was performed for eight articles.

 

Conclusion: The inter-delivery interval 18 months is the safest time to avoid uterine rupture. Prostaglandin analogue induction should be avoided and for patients with a history of past cesarean using a single-layer closure to be educated about the increased risk.

Keywords: cesarean delivery, inter-delivery interval, uterine rupture,vaginal birth after cesarean delivery
The Prevalence and Risk Factors of Constipation in Pregnancy
Authors: Hestiantoro Andon , Baidah Priska A
Published: October 2018

Objective: To estimate the prevalence of constipation inpregnancy and correlation between gestational age, dietaryfiber intake, water comsumption, and physical activity.

 

Methods: This study used cross-sectional design with samples of174 healthy pregnant women undergoing antenatal care atObstetrics and Gynecology Outpatient Clinic RSCM during August -October 2016. Data were collected using questionnaire. Diagnosisof constipation was based on ROME III criteria, dietary fiber ismeasured using Food Frequency Questionnaire (FFQ), and physicalactivity was measured using International Physical Activity Questionnaire(IPAQ). Chi-square and Fisher’s exact test were conducted toevaluate the association between variables.

 

Results: The prevalence of constipation in pregnant womenobserved in this study was 13.2% (95% CI 8.3-18.1). The mostfrequent complaints included straining, incomplete evacuation,and anorectal obstruction. Dietary fiber intake was low in 81.03%subject. with average dietary fiber intake of 18.97 gram/day.There was no significant association between constipation andgestational age (OR 4.36, 95%CI 0.51-37.48 for second trimesterand OR 2.04, 95%CI 0.25-16.7 for third trimester), dietaryfiber intake (OR 0.82, 95%CI 0.28-2.39), water consumption(OR 1.38, 95%CI 0.56-3.41), and physical activity (OR 1.167,95%CI 0.28-4.87).

 

Conclusion: Prevalence of constipation in pregnant women is13.2%. There is no significant correlation between gestational age,dietary fiber intake, water consumption, and physical activity.

 

Keywords: constipation, pregnant woman, ROME III
Factors Affecting the Development of Anxiety in Postmenopausal Women: A CrossSectional Study in Coastal Areas
Authors: Saimin Juminten , Wicaksono Satrio , Junuda Junuda , Minarti Minarti
Published: October 2018

Objective: To analyze factors associated with anxiety in postmenopausal women.

 

Methods: This study was descriptive analytic with cross-sectional approach conducted in 228 postmenopausal women that aged 50-64 years old in coastal areas of Kendari City. Samples were taken by simple random sampling. The technique of collecting data used questionnaires and the Taylor Manifest Anxiety Scale (T-MAS). Data were analyzed using Chi-square test with a significance value p  0.05.

 

Results: The results showed that 188 respondents (82.4%) had. anxiety. Its most experienced anxiety was aged 50-54 years old (37.7%), low education (96.0%), as housewife (62.7%), low income (91.2%) and lived with a partner (54.4%). There was correlation between anxiety with age (p=0.016), education level (p = 0.009), income (p = 0.011), and residence status (p = 0.029). There was no correlation between anxiety with occupation (p = 0.351).

 

Conclusion: There was a correlation between anxiety in postmenopausal women in coastal areas with age, education level, income, and residence status.

 

Keywords: age, anxiety, education level, income, postmenopausal women, residence status
Fetal Biometry is a Prerequisite Part of Modern Antenatal Care
Authors: Salim Azen
Published: October 2018

N/A
Secretory Leukocyte Protease Inhibitor in Preterm Labor and Pregnancy
Authors: Sutiono Ferriyanto , Kaeng Juneke J , Loho Maria FT
Published: October 2018

Objective: To investigate the levels of secretory leukocyteprotease inhibitor (SLPI) in women with preterm labor andpregnancy.

 

Methods: SLPI level examination conducted to 32 samples ofpregnant women who meet the inclusion and exclusion criteria,consists of 16 preterm labor and 16 preterm pregnancy.Sample analysis carried out in Prodia Laboratory Jakarta. SLPIlevel examination used ELISA method. The obtained dataprocessed by SPSS software version 20.0 and discussed withexisting literature theory.

 

Results: Mean plasma SLPI level in patients with preterm laboris 30.319 ng/ml and median: 29.950 ng/ml with p value: 0.652,while the mean on preterm pregnancy is 45.975 ng/ml andmedian: 41.600 ng/ml with p value: 0.005.

 

Conclusion: There are significant differences of SLPI level betweenpreterm labor and preterm pregnancy.

Keywords: preterm labor, preterm pregnancy, SLPI
Rectovaginal Examination, Transvaginal Ultrasonography, and Magnetic Resonance Imaging as Diagnostic Tools for Identifying Deep Infiltrating Endometriosis Nodules
Authors: Wirawan Florencia , Marwali Luky S , Muslim Refni , Silalahi Eva R , Bayuaji Harjo S , Anindita Astri
Published: October 2018

Objective: To investigate the comparison between rectovaginal examination (RVT), transvaginal ultrasonography (TVUS) and magnetic resonance imaging (MRI) as diagnostic tools for identifying various Deep Infiltrating Endometriosis (DIE).

 

Methods: Prospective longitudinal study was done involving 31 women referred for surgical management of DIE. Calculation of sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of RVT, TVUS and MRI for DIE were recorded.

 

Results: The mean age was 35.1 years. DIE were present in 95.45% of women which commonly located at uterosacral ligaments (58.33%), followed by rectovaginal (16,67%), rectosigmoid- colon (16.67%) and bladder-ureter (8.3%). TVUS had the best accuracy (RVT 50.24%; TVUS 88.85%; MRI 75.77%) among other diagnostic tools for nodules located at uterosacral ligaments (RVT 52.63%; TVUS 87%; MRI 40%) and rectovaginal (RVT 76.75%; TVUS 93.34%; MRI 80%), but it poorly identified nodules located at rectosigmoid (RVT 20%; TVUS 65.56%; MRI 88.75%) and bladder-ureteral area (RVT 50.44%; TVUS 87.66%; MRI 93.55%). RVT had good PPV (88.89%) but bad NPV (32.01%) profile, made it worth to be a screening diagnostic tool.

 

Conclusion: RVT was a good screening diagnostic tools as it could be done easily but was weak in diagnosing anterior DIE. TVUS gave a better diagnosis rates on DIE located at sacrouterina ligaments and rectovaginal area whereas MRI did better on bowel DIE (rectosigmoid- colon area) and urological DIE (bladder-ureteral area). 

 

Keywords: deep infiltrating endometriosis, magnetic resonance imaging, tranvaginal ultrasonography
Demographic Characteristics of Mothers Who Delivered Children with Birth Defetcs
Authors: Saroyo Yudianto B , Wijaya Christian , Marsubin Putri M T
Published: October 2018

Abstract

Objective: to determine the characteristics and background of mothers who delivered neonates with birth defects.

Methods: A retrospective study was used by evaluating the medical records of patients with birth defects in Dr. Cipto Mangunkusumo Hospital during the period between September 2014 and June 2016.

Results: A total of 67 (1.85%) out of 3,619 infants who were born in Dr. Cipto Mangunkusumo Hospital during the period between September 2014 and June 2016 had birth defects. Forty-seven (70.1%) mothers of the subjects irregularly attend antenatal care. The most frequent maternal comorbid disease in this study was asthma, which was found in 4 (5.97%) mothers of the subjects. 48 (58.7%) subjects had birth weight under 2500 g.

Conclusion: In this retrospective study, the main highlight is that 70.1% of the mothers who delivered neonates with birth defects did not attend antenatal care regularly. 58.7% of the neonates with birth defects had low birth weight. This study could be used as base for further research investigating about the role of antenatal care in early detection and/or the planning of delivery for babies with birth defects. Trends in babies with birth defects suggested that fetuses diagnosed with IUGR/SGA should be given special attention, as they were at increased risk for birth defects.

Keywords: birth defect, maternal description

 

Abstrak

Tujuan: untuk mengetahui deskripsi/ciri-ciri  dan latar belakang ibu yang melahirkan janin dengan kelainan bawaan.

Metode: Studi retrospektif digunakan dengan menggunakan data sekunder rekam medis pasien dengan kelainan bawaan di Rumah Sakit Umum Pusat Nasional Dr. Cipto Mangunkusumo pada periode September 2014-Juni 2016.

Hasil: Sejumlah 67 (1.85%) dari 3,619 neonatus didapatkan dengan kelainan bawaan di RSUPN Cipto Mangunkusumo pada periode September 2014-Juni 2016 . Sejumlah 47 (70.1%) ibu dari subjek tidak teratur dalam melakukan kunjungan antenatal care. Penyakit komorbid ibu yang paling banyak ditemukan dalam studi ini adalah asma, yang ditemukan dalam 4 (5.97%) subjek. 48 (58.7%) subyek memiliki berat lahir di bawah 2500 g.

Kesimpulan: Pada studi retrospektif ini didapatkan 70.1% ibu yang melahirkan bayi dengan kelainan bawaan tidak melakukan kunjungan antenatal care. Didapatkan bahwa 58,7% bayi yang lahir dengan kelainan bawaan memiliki berat badan lahir rendah (BBLR). Studi ini dapat dijadikan sebagai landasan dilakukannya studi yang lebih besar untuk mengevaluasi peran antenatal care terhadap deteksi dini dan/atau perencanaan persalinan bayi dengan kelainan bawaan. Tren pada bayi dengan kelainan bawaan menunjukkan bahwa janin yang pada antenatal care didapatkan IUGR/SGA patut diperhatikan lebih untuk kecurigaan kemungkinan adanya kelainan bawaan.

Kata kunci:   deskripsi ibu,   kelainan bawaan,
Conformity of Human Papillomavirus between Self-examination of Vaginal Fluid and Cervical Specimen with Fluid-Based Cytology in Precancerous Lesions
Authors: Anwar Rahmawaty , Rauf Syahrul , Moeljono Eddy R.
Published: October 2018

Abstract

Objective: To determine the conformity of human papillomavirus between self-examination of vaginal specimen and cervical specimen with fluid-based cytology in precancerous lesions.

Methods: A cross-sectional study performed on cervical and vaginal fluid from 90 pre-cancerous lesions patients from April to September 2016. Cytological examination performed with self-examination and liquid-based cytology technique. HPV genotyping performed with PCR technique. Data were analyzed with SPSS.

Results: Most of the women aged >35 years (89%), 78% (71/90) multiparity and 74.4% (67/90) do not know about HPV screening. High risk type found in both vaginal and cervical fluid was type 16, 18, 33 and 45 whereas type 35 found only in vaginal fluid. The most prevalent high-risk HPV for both specimens were type 16 and 18. HPV type 42 and 53 were the low risk HPV found in the vaginal and cervical specimens (table 2). Cohenâ€™s kappa for inter-test agreement shows a strong correlation (r=0.864).

Conclusion: The HPV self-examination method can be used as a primary examination of cervical cancer lesions detection in addition to fluid-based cytology with the similar results.

Keywords: Human papillomavirus, self-examination, fluid-based cytology, cervical cancer

 

Abstrak

Tujuan: Untuk mengetahui tingkat kesesuaian antara pemeriksaan HPV mandiri dari spesimen vagina dan hasil pemeriksaan sitologi berbasis cairan dari spesimen serviks.

Metode: Penelitian cross-sectional dilakukan pada cairan serviks dan vagina dari 90 pasien lesi pra-kanker pada April sampai September 2016. Pemeriksaan sitologi dilakukan dengan pemeriksaan diri dan teknik sitologi berbasis cairan. Pemeriksaan genotip HPV dilakukan dengan teknik PCR. Data dianalisis dengan SPSS.

Hasil: Sebagian besar wanita dalam penelitian iniaberusia >35 tahun (89%), 78% (71/90) multiparitas dan 74,4% (67/90) tidak mengetahui tentang skrining HPV. Tipe HPV risiko tinggi yang ditemukan pada cairan vagina dan serviks adalah tipe 16, 18, 33 dan 45 sedangkan tipe 35 hanya ditemukan pada cairan vagina. Tipe HPV risiko tinggi yang dominan untuk kedua spesimen adalah tipe 16 dan 18. HPV tipe 42 dan 53 adalah HPV risiko rendah yang ditemukan pada baik spesimen vagina maupun serviks. Kappa Cohen untuk tingkat kesesuaian antara pemeriksaan mandiri dan sitologi berbasis cairan menunjukkan korelasi kuat (r = 0,864).

Kesimpulan: Metode pemeriksaan HPV secara mandiri sendiri dapat digunakan sebagai pemeriksaan primer deteksi lesi kanker serviks selain sitologi berbasis cairan dengan hasil yang sama.
Multidimensional Optimal Droop Control for DC Microgrids in Military Applications
Authors: Bunker Kaitlyn J. , Cook Michael D. , Weaver Wayne W. , Parker Gordon G.
Published: October 2018

Reliability is a key consideration when microgrid technology is implemented in military applications. Droop control provides a simple option without requiring communication between microgrid components, increasing the control system reliability. However, traditional droop control does not allow the microgrid to utilize much of the power available from a solar resource. This paper applies an optimal multidimensional droop control strategy for a solar resource connected in a microgrid at a military patrol base. Simulation and hardware-in-the-loop experiments of a sample microgrid show that much more power from the solar resource can be utilized, while maintaining the system’s bus voltage around a nominal value, and still avoiding the need for communication between the various components.
Effects of the Phantom Shape on the Gradient Artefact of Electroencephalography (EEG) Data in Simultaneous EEG–fMRI
Authors: Chowdhury Muhammad E. H. , Khandakar Amith , Hossain Belayat , Alzoubi Khawla
Published: October 2018

Electroencephalography (EEG) signals greatly suffer from gradient artefacts (GAs) due to the time-varying field gradients in the magnetic resonance (MR) scanner during the simultaneous acquisition of EEG and functional magnetic resonance imaging (fMRI) data. The GAs are the principal contributors of artefacts while recording EEG inside an MR scanner, and most of them come from the interaction of the EEG cap and the subject’s head. Many researchers have been using a spherical phantom to characterize the GA in EEG data in combined EEG–fMRI studies. In this study, we investigated how the phantom shape could affect the characterization of the GA. EEG data were recorded with a spherical phantom, a head-shaped phantom, and six human subjects, individually, during the execution of customized and standard echo-planar imaging (EPI) sequences. The spatial potential maps of the root-mean-square (RMS) voltage of the GA over EEG channels for the trials with a head-shaped phantom closely mimicked those related to the human head rather than those obtained for the spherical phantom. This was confirmed by measuring the average similarity index (0.85/0.68). Moreover, a paired t-test showed that the head-shaped phantom’s and the spherical phantom’s data were significantly different (p < 0.005) from the subjects’ data, whereas the difference between the head-shaped phantom’s and the spherical phantom’s data was not significant (p = 0.07). The results of this study strongly suggest that a head-shaped phantom should be used for GA characterization studies in concurrent EEG–fMRI.
A Fast and Reliable Luma Control Scheme for High-Quality HDR/WCG Video
Authors: Kim Tae-Young , Kim Yong-Goo
Published: October 2018

The evolution of display technologies makes high dynamic range/wide color gamut (HDR/WCG) media of great interest in various applications including cinema, TV, blue-ray titles, and others. However, the HDR/WCG media format for consumer electronics requires the sampling rate conversion of chroma signals, resulting in a quality problem on the luminance perception of media, even without compression. In order to reduce such luminance perception problems, this paper proposes a fast and reliable luma control scheme which takes advantage of the bounds on the best luma value derived from the solution based on truncated Taylor series. Simulations performed for an extensive comparison study demonstrate that the proposed algorithm significantly outperforms the previous representative fast luma control schemes, resulting in almost the same quality of the iterative optimal solution with a fixed amount of computations per processing unit.
Salt and Pepper Noise Removal for Image Using Adaptive Pulse-Coupled Neural Network Optimized by Grey Wolf Optimization and Bidimensional Empirical Mode Decomposition
Authors: Cui Min , Wu Yicheng , Wang Chenguang , Liu Xiaochen , Shen Chong
Published: October 2018

Aimed at the problem of poor noise reduction effect and parameter uncertainty of pulse-coupled neural network (PCNN), a hybrid image denoising method, using an adaptive PCNN that has been optimized by grey wolf optimization (GWO) and bidimensional empirical mode decomposition (BEMD), is presented. The BEMD is used to decompose the original image into multilayer image components. After a GWO is run to complete PCNN parameter optimization, an adaptive PCNN filter method is used to remediate the polluted noise points that correspond to the different image components, from which a reconstruction of the denoised image components can then be obtained. From an analysis of the image denoising results, the main advantages of the proposed method are as follows: (i) the method effectively solves the deficiencies that arise from the critical PCNN parameter determination issue; (ii) the method effectively overcomes the problem of high-intensity noise effects by providing a more targeted and efficient noise reduction process; (iii) when using this method, the noise points are isolated, and the original pixel points are restored well, which can lead to preservation of image detail information. When compared with traditional image denoising process algorithms, the proposed method can yield a better noise suppression effect, based on indicators including analysis of mutual information (MI), structural similarity (SSIM), the peak signal-to-noise ratio (PSNR) and the standard deviation (STD). The feasibility and applicability of the proposed denoising algorithm are also demonstrated experimentally.
Catalytic Performance of Gold Supported on Mn, Fe and Ni Doped Ceria in the Preferential Oxidation of CO in H2-Rich Stream
Authors: Li Shuna , Zhu Huaqing , Qin Zhangfeng , Zhang Yagang , Wang Guofu , Wu Zhiwei , Fan Weibin , Wang Jianguo
Published: October 2018

Ceria supported metal catalysts often exhibit high activity in the preferential oxidation (PROX) of CO in H2-rich stream and doping the ceria support with other metals proves to be rather effective in further enhancing their catalytic performance. Therefore, in this work, a series of ceria materials doped with Mn, Fe and Ni (CeM, where M = Mn, Fe and Ni; M/Ce = 1/8) were synthesized by a modified hydrothermal method; with the doped ceria materials (CeM) as the support, various supported gold catalysts (Au/CeM) were prepared by the colloidal deposition method. The influence of metal dopant on the performance of these ceria materials supported with gold catalysts in CO PROX was then investigated in detail with the help of various characterization measures such as N2 sorption, XRD, TEM, Raman spectroscopy, H2-TPR, XPS and XAS. The results indicate that the incorporation of Mn, Fe and Ni metal ions into ceria can remarkably increase the amount of oxygen vacancies in the doped ceria support, which is beneficial for enhancing the reducibility of ceria, the metal-support interaction and the dispersion of gold species. Although the gold catalysts supported on various doped ceria are similar in the size and state of Au nanoparticles, the CO conversions for CO PROX over Au/CeMn, Au/CeFe and Au/CeNi catalysts are 65.6%, 93.0% and 48.2%, respectively, much higher than the value of 33.6% over the undoped Au/CeO2 catalyst at ambient temperature. For CO PROX over the Au/CeNi catalyst, the conversion of CO remains near 100% at 60–130 °C, with a PROX selectivity to CO2 of higher than 50%. The excellent performance of Au/CeNi catalyst can be ascribed to its large amount of oxygen vacancies and high reducibility on account of Ni incorporation. The insight shown in this work helps to clarify the doping effect of other metals on the physicochemical properties of ceria, which is then beneficial to building a structure-performance relation for ceria supported gold catalyst as well as developing a better catalyst for removing trace CO in the hydrogen stream and producing high purity hydrogen.
The Middle-Income Trap and the Coping Strategies From Network-Based Perspectives
Authors: Zhou Ming-Yang , Xiong Wen-Man , Li Xiao-Yu , Liao Hao
Published: October 2018

When a developing country reaches a relatively average income level, it often stops growing further and its income does not improve. This is known as the middle-income trap. How to overcome this trap is a longstanding problem for developing countries, and has been studied in various research fields. In this work, we use the Fitness-Complexity method (FCM) to analyze the common characteristics of the countries that successfully get through the middle-income trap, and show the origin of the middle-income trap based on the international trade network. In the analysis, a novel method is proposed to characterize the interdependency between products. The results show that some middle-complexity products depend much on each other, which indicates that developing countries should focus on them simultaneously, implying high difficulty to escape the middle-income trap. To tackle the middle-income trap, developing countries should learn experiences from developed countries that share similar development history. we then design an effective method to evaluate the similarity between countries and recommend developed countries to a certain developing country. The effectiveness of our method is validated in the international trade network.
Exploring Affective Dimensions of Authentic Geographic Education Using a Qualitative Document Analysis of Students’ YouthMappers Blogs
Authors: Hite Rebecca , Solís Patricia , Wargo Lindsay , Larsen Thomas Barclay
Published: October 2018

Research suggests numerous cognitive benefits of authentic learning experiences. Beyond cognition, there are additional dimensions for learners who engage in authentic learning experiences. In education, the affective experiences of authentic learning and the role of students’ social interactions remain largely unexplored. This paper examines students’ affective and social experiences derived from blog posts published on the YouthMappers website. YouthMappers is an international network of university students who create open map data for humanitarian and development programming. In an analysis of two years (2016–2017) of 82 blogs from the YouthMappers network, students from the U.S. and abroad report motivating experiences fueled by social events and gatherings. The participants also find value in communicating with, encouraging, educating, and supporting their peers. Geographic region and gender also play a part in their accounts. This paper seeks to advance research in student affect and social interactions during authentic learning experiences. Positive affective and social experiences may be employed to create authentic learning experiences, building impactful social and emotional experiences for globally-diverse students.
Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms
Authors: Gonçalves Fábio , Pinto Alfred , Mesquita Renato , Silva Elson , Brancaccio Adriana
Published: October 2018

The knowledge of the electromagnetic constitutive properties of materials is crucial in many applications. Free-space methods are widely used for this purpose, despite their inherent practical difficulties. This paper describes an affordable free-space experimental setup for the characterization of flat samples in 1–6 GHz in a non-anechoic environment. The extracted properties are obtained from the calibrated Scattering Parameters, using a frequency-by-frequency solution or a multi-frequency reconstruction. For the first, we describe how the Time-Domain Gating can be implemented and used for filtering the signals. For the latter, a weighting factor is introduced to balance the reflection and transmission data, allowing one to have a more favorable configuration. The different role of transmission and reflection measurements on the achievable results is analyzed with regard to experimental uncertainties and different noise scenarios. Results from the two strategies are analyzed and compared. Good agreement between simulation, measurement and literature is obtained. According to the reported results for dielectric materials, there is no need of filtering the data by a Time-Domain Gating in case of the multi-frequency approach. Experimental results for Polymethylmethacrylate (PMMA) and Polytetrafluorethylene (PTFE) samples validate both the setup and the processing.
Evolution of Coal Permeability during Gas Injection—From Initial to Ultimate Equilibrium
Authors: Liu Xingxing , Sheng Jinchang , Liu Jishan , Hu Yunjin
Published: October 2018

The evolution of coal permeability is vitally important for the effective extraction of coal seam gas. A broad variety of permeability models have been developed under the assumption of local equilibrium, i.e., that the fracture pressure is in equilibrium with the matrix pressure. These models have so far failed to explain observations of coal permeability evolution that are available. This study explores the evolution of coal permeability as a non-equilibrium process. A displacement-based model is developed to define the evolution of permeability as a function of fracture aperture. Permeability evolution is tracked for the full spectrum of response from an initial apparent-equilibrium to an ultimate and final equilibrium. This approach is applied to explain why coal permeability changes even under a constant global effective stress, as reported in the literature. Model results clearly demonstrate that coal permeability changes even if conditions of constant effective stress are maintained for the fracture system during the non-equilibrium period, and that the duration of the transient period, from initial apparent-equilibrium to final equilibrium is primarily determined by both the fracture pressure and gas transport in the coal matrix. Based on these findings, it is concluded that the current assumption of local equilibrium in measurements of coal permeability may not be valid.
A Compendium of Performance Metrics, Pricing Schemes, Optimization Objectives, and Solution Methodologies of Demand Side Management for the Smart Grid
Authors: Ahmad Sadiq , Ahmad Ayaz , Naeem Muhammad , Ejaz Waleed , Kim Hyung Seok
Published: October 2018

The curtailing of consumers’ peak hours demands and filling the gap caused by the mismatch between generation and utilization in power systems is a challenging task and also a very hot topic in the current research era. Researchers of the conventional power grid in the traditional power setup are confronting difficulties to figure out the above problem. Smart grid technology can handle these issues efficiently. In the smart grid, consumer demand can be efficiently managed and handled by employing demand-side management (DSM) algorithms. In general, DSM is an important element of smart grid technology. It can shape the consumers’ electricity demand curve according to the given load curve provided by the utilities/supplier. In this survey, we focused on DSM and potential applications of DSM in the smart grid. The review in this paper focuses on the research done over the last decade, to discuss the key concepts of DSM schemes employed for consumers’ demand management. We review DSM schemes under various categories, i.e., direct load reduction, load scheduling, DSM based on various pricing schemes, DSM based on optimization types, DSM based on various solution approaches, and home energy management based DSM. A comprehensive review of DSM performance metrics, optimization objectives, and solution methodologies is’ also provided in this survey. The role of distributed renewable energy resources (DERs) in achieving the optimization objectives and performance metrics is also revealed. The unpredictable nature of DERs and their impact on DSM are also exposed. The motivation of this paper is to contribute by providing a better understanding of DSM and the usage of DERs that can satisfy consumers’ electricity demand with efficient scheduling to achieve the performance metrics and optimization objectives.
A Bi-Level EV Aggregator Coordination Scheme for Load Variance Minimization with Renewable Energy Penetration Adaptability
Authors: Khan Saad Ullah , Mehmood Khawaja Khalid , Haider Zunaib Maqsood , Rafique Muhammad Kashif , Kim Chul-Hwan
Published: October 2018

The provision of ancillary services by electric vehicles (EVs) such as load smoothing and renewable energy (RE) compensation in the form of an aggregated storage is more regulated in the smart grid context. As such, the presence of multiple EV aggregators in the distribution network requires adept supervision by the distribution system operator (DSO). In this paper, a coordination scheme of aggregators is proposed to smoothen the load profile of distribution networks by enacting EV discharging during peak load and off-peak charging, keeping in view the EV driving requirements. A bi-level on-line interaction procedure from the DSO to the aggregators and vice versa is devised to manage the aggregators based upon their energy capacity and requirements. The aggregators employ a water-filling algorithm in a two-step EV power allocation method. The proposed scheme operation is demonstrated on an medium voltage (MV) distribution feeder located in Seoul with its actual traffic density data. The results show the achievement of peak shaving and valley filling objectives under aggregator coordination and that the EVs are completely charged before departure. The effect of various EV penetration levels and adaptivity of the scheme to RE incorporation is also verified. Furthermore, a comparison with an existing peak shaving method shows the superior performance of the proposed scheme.
Evaluation of the Effects of Biodiesel on Emissions and Performance by Comparing the Results of the New European Drive Cycle and Worldwide Harmonized Light Vehicles Test Cycle
Authors: Kaya Tolgahan , Kutlar Osman Akın , Taskiran Ozgur Oguz
Published: October 2018

In this paper, the effects of biodiesel on performance and emission of the current and new-coming regulation cycles, namely the New European Driving Cycle (NEDC) and the Worldwide Harmonized Light Vehicles Test Cycle (WLTC), were investigated by conducting tests on a passenger car, a Euro-5 Ford Fiesta, equipped with a 1.5-L diesel engine. In a two-axle chassis dynamometer test bed, NEDC and WLTC were performed with pure diesel and biodiesel-to-diesel blend (30% biodiesel, 70% diesel in volume). A substantial reduction in CO (34%, 55%), HC (33%, 40%), and particulate number (PN) (22%, 31%) emissions was observed respectively for both the NEDC and WLTC when biodiesel was used. Besides, it was found that the WLTC has higher load and velocity profile compared to the NEDC. Moreover, lower CO, HC, and PN emissions were observed with B30 fuel under WLTC compared to the NEDC. Nevertheless, slightly higher CO2 and substantially higher NOx emissions were observed for the WLTC compared to the NEDC.
Falls in Geriatric Populations and Hydrotherapy as an Intervention: A Brief Review
Authors: Turner Alana J. , Chander Harish , Knight Adam C.
Published: October 2018

Falls and fall-related injuries are a serious health concern in geriatric populations, especially with age-related deficits in postural control and during postural control challenging dual-task situations. Balance training has been reported to be beneficial in reducing falls. However, some of these exercises have their inherent physical challenges that prevent the elderly population from performing them effectively. Other concomitant age-related illness in the elderly pose further challenges in performing these exercises. Hence, the topic of finding alternative types of balance training that are effective and are performed in a safer environment is constantly researched. One such alternative is hydrotherapy that focuses on balance and postural perturbation-based exercises in water-based environments such as aquatic swimming pools or in dedicated hydrotherapy pools. Hydrotherapy for geriatric populations has been reported to be beneficial in improving balance, motor and cognitive tasks with improved motivation and positive attitude towards exercises. Additionally, hydrotherapy also has properties of buoyancy, resistance and temperature, which benefit biomechanical and physiological wellness and offers a safe environment to perform balance training. Hydrotherapy balance training need to be scaled and prescribed according to individual needs and can serve as an effective training and rehabilitation protocol in reducing falls in geriatric population.
The Role of Apoptotic Signaling in Axon Guidance
Authors: Kellermeyer Riley , Heydman Leah M. , Mastick Grant S. , Kidd Thomas
Published: October 2018

Navigating growth cones are exposed to multiple signals simultaneously and have to integrate competing cues into a coherent navigational response. Integration of guidance cues is traditionally thought to occur at the level of cytoskeletal dynamics. Drosophila studies indicate that cells exhibit a low level of continuous caspase protease activation, and that axon guidance cues can activate or suppress caspase activity. We base a model for axon guidance on these observations. By analogy with other systems in which caspase signaling has non-apoptotic functions, we propose that caspase signaling can either reinforce repulsion or negate attraction in response to external guidance cues by cleaving cytoskeletal proteins. Over the course of an entire trajectory, incorrectly navigating axons may pass the threshold for apoptosis and be eliminated, whereas axons making correct decisions will survive. These observations would also explain why neurotrophic factors can act as axon guidance cues and why axon guidance systems such as Slit/Robo signaling may act as tumor suppressors in cancer.
The Distribution and Severity of Corrosion Damage at Eight Distinct Zones of Metallic Femoral Stem Implants
Authors: Milimonfared Roohollah , Oskouei Reza H. , Taylor Mark , Solomon Lucian B.
Published: October 2018

Metallic taper junctions of modular total hip replacement implants are analysed for corrosion damage using visual scoring based on different granularity levels that span from analysing the taper holistically to dividing the taper into several distinct zones. This study aims to objectively explore the spatial distribution and the severity of corrosion damage onto the surface of metallic stem tapers. An ordinal logistic regression model was developed to find the odds of receiving a higher score at eight distinct zones of 137 retrieved stem tapers. A method to find the order of damage severity across the eight zones is introduced based on an overall test of statistical significance. The findings show that corrosion at the stem tapers occurred more commonly in the distal region in comparison with the proximal region. Also, the medial distal zone was found to possess the most severe corrosion damage among all the studied eight zones.
Mechanical Properties and Microstructure Evolution of Mg-6 wt % Zn Alloy during Equal-Channel Angular Pressing
Authors: Yan Jingli , Qin Zijun , Yan Kai
Published: October 2018

Equal-channel angular pressing (ECAP) was performed on a Mg (6 wt %) Zn alloy at temperatures from 160 to 240 °C and the microstructures and mechanical properties were studied using optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and an electronic universal testing machine. The results showed that ECAP was effective for grain refinement and a bi-modal grain structure formed at low temperatures, which was stable during ECAP from 160 to 200 °C. MgZn2 phase and Mg4Zn7 phase were generated during the ECAP process. The mechanical properties remarkably increased after two repetitions of ECAP. However, the strengths could not be further improved by increasing the plastic deformation, but decreased when ECAP was performed between 200 and 240 °C. The mechanical properties of the ECAP Mg-6Zn alloy was determined by a combination of grain refinement strengthening, precipitation hardening, and texture softening.
Change of the Chemical and Mineralogical Composition of the Slag during Oxygen Blowing in the Oxygen Converter Process
Authors: Baricová Dana , Pribulová Alena , Futáš Peter , Buľko Branislav , Demeter Peter
Published: October 2018

The article presents the results of the investigation of changes in the chemical and mineralogical composition of slag during steel production in a blown oxygen converter. This process was monitored using the slag samples that were collected during the period when oxygen blowing into an oxygen converter was interrupted. The slag samples were collected after 150 s (2.5 min), then after 5, 8, 11, and 24 min of oxygen blowing, and in minute 27 when oxygen blowing was terminated. The sampling was carried out within five consecutive melting processes. The article presents and documents the changes in the contents of CaO, CaO (free), Fe (total), FeO, SiO2, and in the basicity of the slag during oxygen blowing. It also provides the characteristics of individual structural components formed during oxygen blowing and a detailed description of the lime assimilation process, including the formation of the final structure of the slag, consisting of dicalcium silicate (2CaO·SiO2), tricalcium silicate (3CaO·SiO2), RO-phase, and calcium ferrites (2CaO·Fe2O3). The results of the investigation of the changes in the chemical composition of the slag during oxygen blowing in an oxygen converter were compared with the changes in the structural composition of the slag.
High-Power Passive Fiber Components for All-Fiber Lasers and Amplifiers Application—Design and Fabrication
Authors: Stachowiak Dorota
Published: October 2018

The most important components for application in high-power all-fiber lasers and amplifiers are, most of all, power combiners, but also mode field adaptors. This paper summarizes recent achievements in the area of development and fabrication of high-power passive fiber components. The principles of operation and basic design and fabrication criteria, which have to be taken into account while designing the aforementioned components, are explained in detail. The most recent impressive achievements are summarized and described.
Research on Fault Diagnosis of Gearbox with Improved Variational Mode Decomposition
Authors: Wang Zhijian , Wang Junyuan , Du Wenhua
Published: October 2018

Variational Mode Decomposition (VMD) can decompose signals into multiple intrinsic mode functions (IMFs). In recent years, VMD has been widely used in fault diagnosis. However, it requires a preset number of decomposition layers K and is sensitive to background noise. Therefore, in order to determine K adaptively, Permutation Entroy Optimization (PEO) is proposed in this paper. This algorithm can adaptively determine the optimal number of decomposition layers K according to the characteristics of the signal to be decomposed. At the same time, in order to solve the sensitivity of VMD to noise, this paper proposes a Modified VMD (MVMD) based on the idea of Noise Aided Data Analysis (NADA). The algorithm first adds the positive and negative white noise to the original signal, and then uses the VMD to decompose it. After repeated cycles, the noise in the original signal will be offset to each other. Then each layer of IMF is integrated with each layer, and the signal is reconstructed according to the results of the integrated mean. MVMD is used for the final decomposition of the reconstructed signal. The algorithm is used to deal with the simulation signals and measured signals of gearbox with multiple fault characteristics. Compared with the decomposition results of EEMD and VMD, it shows that the algorithm can not only improve the signal to noise ratio (SNR) of the signal effectively, but can also extract the multiple fault features of the gear box in the strong noise environment. The effectiveness of this method is verified.
A Fuzzy Tuned and Second Estimator of the Optimal Quaternion Complementary Filter for Human Motion Measurement with Inertial and Magnetic Sensors
Authors: Zhang Xiaoyue , Xiao Wan
Published: October 2018

To accurately measure human motion at high-speed, we proposed a simple structure complementary filter, named the Fuzzy Tuned and Second EStimator of the Optimal Quaternion Complementary Filter (FTECF). The FTECF is applicable to inertial and magnetic sensors, which include tri-axis gyroscopes, tri-axis accelerometers, and tri-axis magnetometers. More specifically, the proposed method incorporates three parts, the input quaternion, the reference quaternion, and the fuzzy logic algorithm. At first, the input quaternion was calculated with gyroscopes. Then, the reference quaternion was calculated by applying the Second EStimator of the Optimal Quaternion (ESOQ-2) algorithm on accelerometers and magnetometers. In addition, we added compensation for accelerometers in the ESOQ-2 algorithm so as to eliminate the effects of limb motion acceleration in high-speed human motion measurements. Finally, the fuzzy logic was utilized to calculate the fusion factor for a complementary filter, so as to adaptively fuse the input quaternion with the reference quaternion. Additionally, the overall algorithm design is more simplified than traditional methods. Confirmed by the experiments, using a commercial inertial and magnetic sensors unit and an optical motion capture system, the efficiency of the proposed method was more improved than two well-known methods. The root mean square error (RMSE) of the FTECF was less than 2.2° and the maximum error was less than 5.4°.