bluuebunny/crossref_metadata_2025 huggingface dataset:
Kajian Tauhid dalam Bingkai Aswaja
Authors:   Pusat Kegiatan Belajar Masyarakat Negeri 35 Jakarta Barat, Hawassy Ahmad
Published: March 2022

Buku tauhid yang ada di hadapan pembaca ini, penyusun sajikan bukan untuk menambah terlebih memperluas bahasan kajian Islam dalam ilmu tauhid. Sebaliknya, kandungan buku tauhid ini tidak lain hanya kutipan-kutipan dari sekian literatur kitab-kitab tauhid klasik dan kontemporer. Kutipan-kutipan inipun tak ubah layaknya setetes air dari lautan yang seakan tidak bertepi, ia tidak menawarkan janji untuk dapat menghapus rasa dahaga. Namun buku tauhid yang penulis sodorkan ini setidaknya memberikan kontribusi untuk menjadi bahan kajian untuk lebih meningkatkan keimanan kita kepada Allah. Paling tidak buku tauhid ini menggunakan edisi bahasa Indonesia dari sekian banyak literatur berbahasa Arab yang menjelaskan tentang kajian-kajian tauhid.
Belajar Matematika Menggunakan Pendekatan Concrete, Pictorial, dan Abstract (CPA)
Authors: Anggraeni Wulan , Susano Adhi
Published: February 2022

Tujuan dari kegiatan PkM ini adalah para orang tua murid Sekolah Islam Fitrah Al Fikri dapat mendampingi anaknya untuk belajar matematika yang mudah, asik dan menyenangkan dengan menggunakan pendekatan Concrete, Pictorial, Abstract (CPA). Kegiatan ini disambut positif oleh semua pihak di Sekolah Islam Fitrah Al Fikri. Selama proses pelatihan berlangsung, para orangtua murid antusias dalam mengikuti setiap kegiatan. Secara umum, kegiatan pelatihan ini berjalan dengan lancar. Jumlah peserta pelatihan sebanyak 50 orang yang terdiri dari orang tua murid di lingkungan Sekolah Islam Fitrah Al Fikri. Kegiatan pelatihan diawali dengan games terlebih dahulu, games pertama adalah games berkelompok. Satu kelompok terdiri atas 5 orang. Kami memainkan games gerakan yang harus diikuti sesuai dengan pola yang diberikan pemateri. Semua peserta melakukan dengan semangat. Setelah itu, peserta kembali ke meja masing-masing. Langkah selanjutnya adalah tes diagnostic. Tes ini dilakukan bukan untuk menguji kemampuan orang tua murid, namun untuk menyegarkan kembali ingatan terhadap operasi matematika. Hasil yang diperoleh adalah sebanyak 10 orang tua memperoleh nilai A, 25 orang tua memperoleh nilai B, dan 15 orang tua memperoleh nilai C.
Metabolic Regulation of Cell Differentiation
Authors: Frayne Elizabeth
Published: March 2022

Growing research suggests that metabolism itself may play a role in inducing cellular differentiation. This concept stems from three different experimental approaches involving hypoxia, nutrient metabolites, and phosphate analogues, that appear to modulate cellular differentiation by influencing the available cellular energy needed for biosynthetic processes. Possible explanatory mechanisms that could lead to subsequent changes in gene expression include the availability of key metabolites needed for epigenetic changes to occur and/or kinases that can sense the cellular energy charge.
IMPLEMENTASI METODE TILAWATI DALAM MEMBACA AL-QURAN DI TAMAN PENDIDIKAN AL-QUR’AN AL ABROR GEMBYANG KEBOMAS GRESIK
Authors: Niswatuz Zahro’  , Noor Amirudin, M.Pd.I  , Drs. Man Arfa Ladamay, M.Pd.
Published: February 2022

Penelitian ini bertujuan untuk mengetahui implementasi metode pembelajaran al- Qur’an di Taman Pendidikan Al-Qur’an Al Abror. Dalam penelitian ini, metode penelitian yang digunakan adalah deskriptif analisis dengan latar penelitian di Taman Pendidikan Al-Qur’an Al Abror, subyek penelitiannya adalah santri Tilawati jilid 2 yang setiap kelompoknya berjumla 15 santri. Peneliti melakukan observasi terhadap aktivitas guru meliputi pelaksanaan kegiatan pembuka, pelaksanaan kegiatan inti, pendekatan pembelajaran oleh guru, penataan kelas pembelajaran dan pelaksanaan evaluasi, selain observasi aktivitas guru, peneliti juga mengamati aktivitas santri dalam pembelajarn meliputi kelancaran membaca Al-Qur’an santri. Penerapan metode Tilawati di Taman Pendidikan Al-Qur’an Al Abror secara keseluruh sesuai dengan ketentuan-ketentuan yang telah ditetapkan oleh lembaga Tilawati, namun terdapat beberapa hal yang disesuaikan dan dikombinasikan dengan keadaan dan program di TPQ, seperti pada saat pembelajaran belum diberikannya materi menulis dan materi penunjang hafalan doa-doa, pada kelas khusus diterapkan metode tambahan yaitu metode privat. Meskipun demikian, penerapan metode Tilawati pada pembelajaran Al-Qur’an di Taman Pendidikan Al-Qur’an Al Abror tetap sesuai dengan ketentuan dan prinsip dasar Tilawati.
КУЛЬТУРНО-ХРОНОЛОГИЧЕСКИЕ КОМПЛЕКСЫ БЕРЁЗОВОГРИВСКО-АЛЕКСЕЕВСКОГО III ПОСЕЛЕНИЯ В НИЖНЕМ ПРИКАМЬЕ
Authors:   Institute of Archaeology named after A.Kh. Khalikov of the Academy of Sciences of the Republic of Tatarstan, Kazan, Shipilov A.V.
Published: February 2022

The article represents the materials of study of the site of Beryozogrivsko-Alexeevskoe III that is situated in the Low Kama region. The earliest findings from this site are associated with Kamskaya Neolithic culture. A somewhat later chronological position is occupied by the complexes represented with the pit-comb, Russko-Azibeyskaya and Novoil’inskaya ceramics. The complex of findings associated with the Garinskaya Eneolithic culture deserves special attention in the article. The largest number of finds belongs to the Bronze Age. They are combined into several complexes belonging to the Srubnaya, Lugovskaya, and Maklasheevskaya cultures. The latest history of the Beryozogrivsko-Alexeevskoe III site was associated with the Anan’inskaya cultural and historical area.
MORPHOLOGY OF TERRESTRIAL DWELLINGS IN WESTERN CHUKOTKA: FROM THE MESOLITHIC TO THE PRESENT
Authors:   Peter the Great Museum of Anthropology and Ethnography (the Kunstkamera), Russian Academy of Sciences, St. Petersburg, Danilov G.K.
Published: February 2022

The author made an attempt to systematize the actual information about stone structures of dwelling constructions in the Western Chukotka. The article is based on a review of the published data, as well as on the results obtained by author’s field observations in expeditions of the N.A. Shilo North-East Interdisciplinary Scientific Research Institute of the Far East branch of the Russian Academy of Science during the last ten years. A light-weight mobile dwelling which construction requires stones to set a cover of skins has been an integral part of the landscape of this area from ancient to the present day. Stone constructions left after the dismounting of a dwelling are important structural elements of archaeological sites of different ages. A comparative study of the ancient dwelling stone constructions allows to conclude that the construction of frame dwellings in the region was changing over time. The earliest stone structures that have remained from dwellings are known from the Mesolithic sites. The architecture of the Mesolithic dwellings seems to differ from the circular constructions of later times. An analysis of the morphology of the studied structures and ethnographic data allow to suppose that dwellings like a chum or hemisphere type were used in Western Chukotka for a long time. Yaranga-type dwellings appeared later, and its shape was developed presumably at least 200 years ago.
SALT IN TRADITIONS AND RITES OF BASHKIR
Authors:   Institute of History, Language and Literature Ufa Federal Research Center RAS, Migranova E.V. , Absalyamova Yu.A. ,   Institute of History, Language and Literature Ufa Federal Research Center RAS
Published: February 2022

The article is based on materials from the authors’ field expeditions and folklore sources, and reveals the significance of the most important mineral – salt – in the traditional culture of the Bashkirs. The Bashkirs have long used salt from the Iletsk deposit, which was located on the patrimonial lands of the Bashkirs; until the middle of the 18th century they used it for free, for which they paid yasak to the treasury. The authors consider the everyday, pharmacological, religious aspects of the use of salt among the Bashkirs. A special perception of salt was well reflected in the Bashkir vocabulary, in which there are many stable expressions with the word «тоҙ» (bash. 'salt'), for example: «тоҙһоҙ» ('meaningless', literally «unsalted»), «тоҙ күҙ» ('meaningless look, eyes', literally «salt eyes»), «тоҙ һипкән кеүек» ('attractive', literally «like sprinkled with salt»), «һаҡы тоҙло» («very expensive in price», literally «salty price»).
THE STATE BANK OFFICE IN SAMARA REGION AT THE EARLY XX CENTURY: ORGANIZATION OF INTERNAL LIFE
Authors:   Samara State University of Economics, Cherkasova N.A.
Published: February 2022

On the base on archival documents, the author examines the social composition, educational level, and professional competencies of employees of the Samara office of the Russian Empire State Bank from the standpoint of the theory of institutionalism. The study comes to the conclusion about the gradual staff growth in the department, the improvement of the professional competencies of its employees, the manifestation of the social protection function by the bank. The author argues that the State Bank as an important system element of the capitalist economy in the Russian Empire at the beginning of the twentieth century still retained elements of traditional (paternalistic) relations in its inner life.
SOCIAL ADAPTATION OF THE FOREIGN STUDENTS: EXPERIENCE OF RUSSIAN UNIVERSITIES
Authors:   Samara State Technical University, Mukhametshina N.S. , Kostykova E.I. ,   A.I. Evdokimov Moscow State University of Medicine and Dentistry, Parenkova O.R. ,   A.I. Evdokimov Moscow State University of Medicine and Dentistry
Published: February 2022

The authors distinguish the stages of state policy on educational migration, focus on possible ways to increase the attractiveness of Russian universities for foreign students, offer an analysis of organizational forms of cooperation with foreign students and social adaptation practices used in Russian universities during the post-Soviet period. The study is based on the materials of the survey of foreign students studying at the Moscow State University of Medicine and Dentistry.
ОБРАЗОВАТЕЛЬНАЯ ПОЛИТИКА И ФОРМИРОВАНИЕ БРИТАНСКОЙ ИДЕНТИЧНОСТИ НА НАЦИОНАЛЬНЫХ ОКРАИНАХ
Authors:   Samara State University of Social Sciences and Education, Malkin S.G.
Published: February 2022

Addressing historical cases has not only academic but also political significance, especially if the current agenda is largely determined by the rhetoric and experience of conflicts rooted in history. In this regard, the article focuses on the nature, forms and consequences of British educational policy on the national outskirts in Modern times in the formation of British identity, which supported the practice of national and state building at the ideological level both within the United Kingdom and within the British Empire. Specific historical and contemporary examples demonstrate the possibilities and limitations of educational policy as a humanitarian technology for strengthening the ideological and rhetorical foundations of Great Britain as a multinational and complex public entity. The study focuses on the Scottish case which has the deepest historically roots; its analysis allows a more detailed study of the relationship between the educational strategies of the authorities in the past and their consequences in the present, taking into account the prospects for a second referendum on Scottish independence in the context of Britain’s exit from the European Union.
МЕТОДОЛОГИЯ ГУМАНИТАРНЫХ НАУК ПО Н.И. КАРЕЕВУ В СВЕТЕ МЕЖДИСЦИПЛИНАРНОСТИ
Authors:   Samara State Medical University, Zanin, S.V. , Shchukina N. P. ,   Samara State Medical University
Published: February 2022

The article is based on the materials of historical, sociological and methodological works by N. I. Kareev and contains an analysis of his understanding of interdisciplinarity. The analysis led to the conclusion that the development of terminology, classification of sciences and research methodology was central to Kareev’s works throughout his entire scientific career. Moreover, Kareev’s constant references to these topics indicate that the scientist felt the need for such a methodological and meta-scientific reflection. Constantly addressing the issues of interaction of sciences (interdisciplinarity), he discovered some conditions that made it possible, namely: interdisciplinarity is possible only with a strict delineation of the subject area of sciences; it is due to a certain phase in the development of the humanities and social sciences, one of which becomes the basis for scientific reflection (in his works it is the sociology); interdisciplinarity in social sciences and humanities is possible only at the level of fundamental research, but not in applied research. N.I. Kareev’s works seem relevant in the light of the ongoing discussions in contemporary Russian humanities about interdisciplinarity, the use of scientific terminology in the humanities and the objectivity of scientific knowledge.
VISUAL STRATEGIES OF COMMEMORATION IN THE LATE OTTOMAN EMPIRE AND THE CONSTRUCTION OF COUNTER-MEMORY (ON THE EXAMPLE OF THE RUSSIAN MONUMENT IN SAN STEFANO)
Authors:   Samara National Research University named after Academician S.P. Korolev, Zherdeva Yu.A.
Published: February 2022

The article is devoted to the mechanisms of constructing the memory of Russian military victories on the territory of the late Ottoman Empire, which were formed with the creation of the Russian monument in San Stefano. The author compares several competing memories of this memorial: the official Russian imperial narrative about the military victory over the Ottoman Empire in 1878, the Ottoman memory of the catastrophic military and diplomatic defeat, the memory of the Turkish society about the incident of the destruction of the monument, and modern memorial discourses. The author traces some changes in memory policy in Late Ottoman and Turkish society.
АНТРОПОМОРФНЫЕ ИЗОБРАЖЕНИЯ УРАЛА В КАМНЕ, ГЛИНЕ И ГРАВИРОВКАХ
Authors:   Russian State Vocational Pedagogical University (Nizhniy Tagil Branch), Serikov Yu.B.
Published: February 2022

Despite its rarity, wooden sculpture of the Urals has been the subject of numerous publications and scientific researches. The anthropomorphic sculptures made of stone, clay, and engraved anthropomorphic images are less known. Currently, the literature describes about 400 images of living creatures found in the Urals and the adjacent Trans-Urals and dated in the time range from the Paleolithic to the Bronze Age. Anthropomorphic images are represented by 60 artifacts, which is only 15 % of the total. Anthropomorphic stone images can be roughly divided into round, flat and flint sculptures. Pendants made in the form of a human head are very interesting. Clay figures are represented by images of women and separate heads. Anthropomorphic engraved images on stone and bone are rare finds. Images of anthropomorphic figures on ceramic vessels constitute a separate group. Most of the sculptural and graphic images dates back to the Neolithic and the Eneolithic.
Autoimuninėmis ligomis sergančių pacientų (vaikų ir suaugusiųjų) vakcinacijos aktualijos
Authors: Žėkaitė-Vaišnienė Erika , Šnipaitienė Aušra , Jankauskaitė Lina
Published: February 2022

Maždaug vienas iš 20 žmonių Europoje ir Šiaurės Amerikoje serga autoimunine liga. Nors kai kurias autoimunines ligas sąlygoja genetiniai veiksniai, tačiau gerai žinomi ir aplinkos veiksniai, iš kurių vienas dažniausių – infekcijos. Vakcinos yra vienas veiksmingiausių žinomų būdų, siekiant išvengti tam tikrų infekcijų. Tyrimo tikslas. Apžvelgti naujausias autoimuninėmis ligomis sergančių pacientų (suaugusiųjų ir vaikų) vakcinacijos rekomendacijas. Apžvelgiamos gyvų susilpnintų, negyvų ir vakcinų nuo SARS-CoV-2 rekomendacijos. Metodai. Mokslinių darbų paieška atlikta naudojant kompiuterinę bibliografinę mokslinių darbų bazę PubMed, taip pat remtasi naujausių konferencijų ir tarptautinių gairių duomenimis. Analizuoti publikuoti moksliniai tyrimai, straipsniai ir elektroninės knygos. Paieškose buvo vartojami reikšminiai žodžiai ir jų deriniai: autoimmune diseases, rheumatic diseases, vaccination, SARS-CoV-2 infection, immunosuppressive drug. Rezultatai. Pacientai, sergantys autoimuninėmis ligomis, turi didesnę riziką sirgti įvairiomis infekcinėmis ligomis. Jiems rekomenduojamos tiek negyvos, tiek gyvos susilpnintos vakcinos. Dėl imunosupresinių medikamentų vartojimo galimas prastesnis imuninis atsakas po vakcinacijos gyvomis susilpnintomis vakcinomis. Vakcinacija nuo SARS-CoV-2 yra rekomenduojama pacientams, sergantiems autoimuninėmis ligomis: suaugusiesiems ir vaikams nuo 12 metų amžiaus.
Stargardto geltonosios dėmės degeneracija
Authors: Puslys Tautvydas , Braždžiūnas Mindaugas , Stanislovaitienė Daiva
Published: February 2022

Tyrimo tikslas. Apžvelgti mokslinę literatūrą apie Stargardto ligos patogenezę, simptomatiką, diagnostikos ir gydymo galimybes. Tyrimo metodai. Literatūros apžvalga atlikta remiantis mokslinėmis publikacijomis, atrinktomis naudojantis Google Scholar, PubMed paieškos sistemomis. Naudoti raktažodžiai paieškai: Stargardt disease, macular dystrophy, inheritedmacular degeneration. Rezultatai. Stargardto ligą dažniausiai lemia mutacijos ABCA4, ELOVL4 ir PROM1 genuose. Sutrinka metabolinis regos ciklas ir kaupiasi lipofuscino pigmentai fotoreceptoriuose bei tinklainės pigmentiniame epitelyje. Dėl aktyvuotos komplemento sistemos ir vykstančio oksidacinio streso žūva tiek fotoreceptoriai, tiek tinklainės pigmentinio epitelio ląstelės, kas lemia regos silpnėjimą. Simptomai dažniausiai atsiranda tarpinės ir vėlyvosios paauglystės laikotarpiu. Diagnostika yra kompleksinė, susidedanti iš rutininio oftalmologinio ir genetinio ištyrimo. Optinės koherentinės tomografijos tyrime stebimas išorinių tinklainės sluoksnių plonėjimas, tinklainės pigmentinio epitelio atrofija. Nors veiksmingo patogenetinio gydymo nėra, bet modifikuoti vitamino A preparatai, veikiantys medžiagų metabolizmo ciklą, jau yra prieinami. Genų terapija šiuo metu yra preklinikinėse mokslinių tyrimų stadijose, o kamieninių ląstelių terapija peržengė klinikinių tyrimų stadiją, kas teikia vilčių, jog bus atrastas veiksmingas ligos gydymas. Išvados. Stargardto ligą gali sukelti įvykusios mutacijos skirtinguose genuose, priklausomai nuo dominantinio arba recesyvinio paveldimumo. Pagrindiniai simptomai: progresuojantis abipusis centrinio matymo praradimas  – sumažėjęs regos aštrumas, niktalopija, fotofobija, dischromatopsija. Liga diagnozuojama tiriant pacientą oftalmologiniu bei genetiniu būdais. Veiksmingo patogenetinio gydymo nėra.
Dirbtinių ir natūralių saldiklių įtaka diabeto kontrolei
Authors: Rapalavičius Aurimas , Rimkutė Austėja
Published: February 2022

Pacientams, sergantiems diabetu, rekomenduojama sumažinti pridėtinio cukraus vartojimą, pakeičiant jį maistu bei gėrimais, saldintais mažo kaloringumo saldikliais. Tyrimų, kurie vertino dirbtinių saldiklių naudą ir žalą organizmui, rezultatai heterogeniški. Dirbtiniai saldikliai siejami su teigiamu, neigiamu arba neutraliu poveikiu bei baigtimis. Kai kurių tyrimų duomenimis, dirbtiniai saldikliai lėmė nepakankamą sotumo pojūtį, žarnyno disbiozę ir atsparumo insulinui vystymąsi. Natūralūs saldikliai (stevija ir polioliai) gali būti naudingi diabeto kontrolei ir yra saugūs vartoti, tačiau trūksta didesnės imties tyrimų. Teigiamą fruktozės poveikį glikemijai mažinti galimai nusveria dislipidemijos bei hepatosteatozės rizika. Natūralių cukrų, tokių kaip medus, nauda diabeto kontrolei menkai pagrįsta.
Research on Ultra-Realistic Communications
Authors: Enami Kazumasa
Published: March 2022

National Institute of Information and Communications Technology (NICT) is researching ultra-realistic communications system that provides natural and real communications to  verybody. Main research subjects are holographic 3D image and sound systems and necessary requirements for ultra-realistic systems based on underlying principles of human information processing. The Ultra-Realistic Communications Forum was established on March, 2007 to ensure efficient industry-academia-government collaboration in research, development, verication experiments, and standardization on ultra-realistic technologies.
Synthesis and Analysis of a Series-Connected Switched-Capacitor DC-DC converter
Authors: Eguchi Kei
Published: March 2022

series-connected SC (Switched Capacitor) DC-DC converter is introduced. Aiming at an IC implementation of a stepped-down converter for mobile devices, we synthesize the series-connected DC-DC converter by using a family of the charge-averaging type converter. Different from conventional converters, the proposed converter provides only Q/P(P  { 2 ,3,...,N} and Q  {1,2,...,N - 1}) stepped-down voltages. However, the number of power switches for the proposed converter is less than 75 % of that for the conventional converters.Furthermore, the characteristics concerning efficiency and ripple factor are clarified by theoretical analyses since the theoretical analyses concerning the series connected SC power converters have not been performed as far as authors know. The analysis results provide the limitation values of the characteristics of designed circuits. The validity of the circuit designand the theoretical analysis is confirmed by SPICE simulations. Under the condition that the output load RL = 5 ­, the simulations show that 1. the power efficiency is more than 90 %, 2. the electrical power is about 440 mW, and 3. the ripple factor is less than 0.05.
Non-Flooding Bridging Solutions for Resilient Packet Rings
Authors: Setthawong Pisai , Tanterdtid Surat
Published: March 2022

Resilient Packet Ring (RPR) is one of the IP-based technologies that have been proposed to replace SONET/SDH in metropolitan area networks because it is well-adapted to handle diverse tra±c, including multimedia traffic, found in present-day networks. Additionally, the RPR network is used efficiently with nodes transmitting simultaneously as long as the paths of the packets do not overlap. However, when bridging RPR networks, packets are flooded on the bridged RPR network if the packet destination is on a remote network other than the source network. As a result, the network is used inefficiently, decreasing the available bandwidth for other traffic. In this paper, we propose enhanced topology discovery protocol and enhanced spanning tree protocol to prevent the flooding of packets on the bridged RPR network. Simulations were performed in order to evaluate the proposed solutions. The results show that the flooding of packets is successfully prevented and that the network is used more e±ciently as compared to the RPR
A Method for Designing Modified PID Controllers for Time-delay Plants and Their Application
Authors: Yamada Kou , Hagiwara Takaaki , Shimizu Yosuke
Published: March 2022

In this paper, we examine a method for designing modified proportional-integral-derivative (PID) controllers for use in stable and/or minimum-phase time-delay plants. The PID controller structure is the one used most widely in industrial applications. Recently, the parameterization of all stabilizing PID controllers has been considered. However, no method which guarantees the stability of a PID control system for any stable and/or minimum-phase time-delay plants, and in which the admissible sets of P-, I- and D-parameters are independent from each other, has been published. In this paper, we propose a method for designing modi¯ed PID controllers such that the modified PID controller makes the feedback control system for any stable and/or minimum-phase time delay plant stable and the admissible sets of P-, I- and D-parameters are independent from each other. Numerical examples and application in a heat flow experiment are shown to illustrate the effectiveness of the proposed method.
Low-offset BiCMOS Current Controlled Current Differencing Buffered Amplifier (CC-CDBA) and Applications
Authors: Siriphuchyanun Montree , Silapan Phamorn , Jaikla Winai
Published: March 2022

This article presents the design for a basic current mode building block for analog signal processing, called Current Controlled Current Differencing Buffered Amplifier (CC-CDBA). Its parasitic resistances at two current input ports can be controlled by an input bias current. The output current and voltage offset are quite low. The proposed element was realized in a BiCMOS technology and the voltage follower in the element is modified to achieve high performance properties. Its performances are examined through PSPICE simulations. In addition,examples as a current-mode multiplier/divider and current amplifier are included, compared to the conventional CC-CDBA implementation. They disclose performances of the proposed CC-CDBA superior to previous CC-CDBA.
Discrete-Time Feedback Error Learning and Nonlinear Adaptive Controller
Authors: Wongsura Sirisak , Kongprawechnon Waree
Published: March 2022

In this study, the technique of Discrete-Time Feedback Error Learning (DTFEL) is investigated from the viewpoint of adaptive control. First, the relationship between DTFEL and nonlinear discrete-time adaptive control with adaptive feedback linearization is discussed. It shows that DTFEL can be interpreted as a form of nonlinear adaptive control. Second, Lyapunov analysis of the controlled system is presented. It suggests that the condition of strictly positive realness (s.p.r.) associated with the tracking error dynamics is a sufficient condition for asymptotic stability of the closed-loop dynamics. Specifically, for a class of second order SISO systems, it is shown that the control problems is reduced to select the feedback gain that satisfies the s.p.r. Finally, numerical simulations is presented to illustrate the stability properties of DTFEL obtained from mathematical analysis.
An Adaptive Fuzzy Control Double Leaky Bucket Using Backoff Time and Backpressure in Policing Mechanism Schemes over VDSL Network
Authors: Lekcharoen Somchai
Published: March 2022

When congestion occurs in VDSL networks, it will drop incoming frames because the buffer fills up frames until it over°ows. In backpressure algorithm suitable for low traffic [1], it prevents buffer overflows. In backo® time in leaky bucket over traffic policing mechanism suitable for high traffic [2], Backoff time computations are wildly used in order to avoid the impact on the network performance. In this paper, we propose a fuzzy control double leaky bucket using backpressure and backoff time detects violations in parameter negotiation. We evaluate and compare the performance of a fuzzy control backpressure and backo® time in double-leaky bucket as a policing mechanism (FBBD), a leaky bucket (LB), a jumping window (JW), a triggered jumping window (TJW) and a double-leaky bucket (DLB). The performance of fuzzy control backpressure and backo® time in double-leaky bucket was investigated through fluctuations in telecommunications traffic streams (burst/silent type). Simulation results show that in VDSL frames, the fuzzy logic control system helps improve the performance of our fuzzy control double-leaky bucket using backpressure and backoff time schemes as a policing mechanism much better than conventional policing mechanism by about 25 % in terms of conforming and non-conforming frames once various types of burst/silence traffic are generated.
Hybrid Error Concealment Using Linear Interpolation
Authors: Chen Bor Nan , Lin Yinyi
Published: March 2022

In this paper a hybrid error concealment algorithm using linear interpolation is proposed. In the proposed hybrid algorithm, the selective motion field interpolation (SMFI) is employed to conceal the erroneous macroblock. The spatial and temporal boundary-matched errors are then used to check whether the SMFI conceals the erroneous macroblock properly. If the temporally recovered macroblock is reconstructed incorrectly, the spatial error concealment using linear interpolation is employed to conceal the damaged macroblock instead of SMFI.It can achieve better performance subjectively as well as objectively over other error concealment techniques such as AMV, FBBM and MFI. Simulation was conducted on the H.263 codec and the experimental results reveal that the proposed algorithm significantly outperforms other concealment techniques.
RNS based Programmable Decimation Filter for Multi-Standard Wireless Transceivers
Authors: K. Shahana T. , Jose Babita R. , James Rekha K. , Jacob K. Poulose , Sasi Sreela
Published: March 2022

Current research on radio frequency transceivers focuses on multi-standard architectures to attain higher system capacities and data rates. Multiple communication standards are made adaptable by performing channel select filtering on chip at baseband in digital domain. The computationally intensive decimation filter in a sigma-delta analog-to-digital converter plays an important role in channel selection for multi-mode systems. As these architectures are targeted for portable applications, an area and power efficient recon¯gurable implementation is animplicit requirement. To this end, a multi-stage, programmable decimation ¯lter based on residue number system (RNS) that is adaptable for WCDMA and WLAN standards is presented in this research. Multi-stage decimation filter implementation offers low computational complexity and power dissipation. The FIR filters of the multi-stage decimator operating in RNS domain offers high data rate because of the carry free operations on smaller residues in parallel channels. Further power saving is achieved by reconfiguring the hardware architecture, and powering down the unused blocks in each mode of operation. For increased programmability modulo multifiplication is performed by index addition utilizing the arithmetic benefits associated with Galois ¯eld. Finally, a performance comparison of the proposed RNS based decimation ¯lter with traditional binary implementation is done in terms of area, critical path delay and power dissipation.
FFT/IFFT Based Blind SIMO Channel Identification
Authors: Wang Song , Manton Jonathan H.
Published: March 2022

This paper presents an FFT/IFFT based blind identification method for estimating the finite impulse response of single-input multiple-output channels driven by an unknown deterministic signal. The proposed algorithm successfully handles a very small size of received data, for which the existing blind channel estimation methods, including the subspace, cross-relation and shifted correlation algorithms, are known to be ineffective. Moreover, with no assumption of the precise knowledge of channel order, the proposed algorithm is capable of estimating channel parameters as well as detecting channel order. Simulations show that the proposed algorithm outper forms the existing methods in small sample size situations.
Optimizing Signal Transmission in a MIMO System Influenced by Antenna Mutual Coupling
Authors: Lu Shiyang , Hui Hon Tat , Bialkowski Marek , Liu Xia
Published: March 2022

This paper is concerned with investigations into an optimal transmission scheme for a single-user Multiple Input Multiple Output (MIMO) system influenced by the antenna mutual coupling. The concept of "coupled power" relying on the transmitting and receiving mutual impedances is introduced. This concept is used to work out an optimal MIMO transmission scheme when a non-negligible mutual coupling between antenna elements exists. Numerical results illustrate that the proposed signal transmission scheme offers extra capacity to the system. A suitable choice of antenna elements separation to obtain an improved MIMO system performance is discussed for the case of a semi-correlated uplink channel.
Analytical and Experimental Investigation of Substrate Permittivity and Loss up to 67 GHz
Authors: Seiler Patrick , Klein Bernhard , Plettemeier Dirk
Published: March 2022

In this paper, we characterize the substrate permittivity and overall loss of different planar transmission lines (TL) such as microstrip (MS), coplanar waveguide (CPW) and grounded CPW (GCPW) using on-wafer probes and a thru-reflect-line (TRL) calibration technique. The theory for calculation of the related effective permittivity from S-Parameter measurements is given and numerical simulations are being used for a fast and precise mapping of the effective permittivity to the physical value of the TL's substrate. The method presented can be used for higher frequencies, as long as single mode operation of the TLs is ensured. Thus, an overview on higher order modes in TLs and design rules to suppress them is given. The results up to 67 GHz for the aforementioned TL on a conventional RF substrate are presented and used to evaluate approximate models known from publications.
Mobility-Assisted and QoS-Aware Resource Allocation for Video Streaming over LTE Femtocell Networks
Authors: Salhi Meriem , Trabelsi Sihem , Boudriga Noureddine
Published: March 2022

The interest on enhanced capabilities of femtocell networks is increasing, since it copes with the dynamics of future cellular networks. Thus, innovative approaches and concepts are required to guarantee successful deployment of this new generation of cellular networks for carrying challenging services (e.g. multimedia applications) under complex network conditions. In this context, we propose a novel approach that enhances the capability of LTE-femtocell networks when dealing with downlink variable bit rate (VBR) video transmission. The idea consists on making a pre-allocation (or reservation) of radio resources (resource blocks and transmit power) based on the knowledge of future required video traffic of connected users. We also make our approach capable of supporting efficient mobility management through an optimized handover policy. In fact a coordination entity is proposed to select the target cell which is more capable to support future video traffic delivery based on a multi-criteria utility function. Simulation results prove the effectiveness of the proposed approach and illustrate the great gains obtained for both the user side (low frame loss ratio) and the network side (low transmit power).
Guest Editorial Message: Special Issue on Selected Papers from ECTI-CON 2014
Authors: Uthansakul Peerapong , Hattagam Wipawee
Published: March 2022

The 11th annual international conference organized by Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI) Association was held at vibrant and eclectic cultural city of Nakhon Ratchasima, Thailand during May 14-17, 2014.
Guest Editorial Message: Special Issue on Selected Papers from APCC 2014
Authors: Uthansakul Peerapong , Hattagam Wipawee
Published: March 2022

Since the inaugural Asia-Pacific Conference on Communications (APCC) in 1993, APCC has become a forum for researchers and engineers to present and showcase advancements related to information and communication technologies and services. Under the theme “Intelligent Communications for Sustainable Development”, the 20th Asia-Pacific Conference on Communications was held in the dynamic and colorful city of Pattaya, Thailand during October 1-3, 2014.
Improvement of RF-Pilot Based Phase Noise Compensation in CO-OFDM Communication Systems
Authors: Puntsri Kidsanapong
Published: March 2022

This paper presents an improvement of random phase noise (RPN) compensation under chromatic dispersion (CD) by a modified two stages RF-pilot-based. The first stage is similar to the conventional RF-pilot-based method and the second stage is called the fine RPN compensation. The second stage is used for minimizing the random rotation phasor by employing a RF-pilot window. The performance of RPN mitigation is evaluated by a numerical simulation method. At the forward error correction (FEC) limit, a sum laser linewidth tolerance of ~3.1 MHz can be achieved for the 256-quadrature amplitude modulation (QAM) and ~10 MHz for 64-QAM. For CD mitigation, the linear and cubic spline interpolation methods are investigated. The simulation results show that the cubic spline interpolation method provides a significant bit error rate performance improvement.
Design and implementation of a new multilevel push pull inverter topology
Authors: Ajami Ali , Nayeri Babak , Kazemi Farhad Mohajel
Published: March 2022

The paper presents simulation and experimental results of a novel multilevel push pull inverter based multi-winding transformer. In the presented topology the most important advantage is that only one DC voltage source is used for generating the multilevel stepwise waveform in output voltage. Also, the number of switches in the suggested topology is reduced respect to conventional multilevel inverters. In the suggested inverter only one switch will be turn on in each interval and so the conduction losses of converter will decrease. The selective harmonic elimination (SHE) method is used for generating the gate pulses. Therefore the converter losses include switching losses and conducting losses, are reduced and so the efficiency of inverter is increased. Design procedure of transformer turn ratio is presented in this paper. The suggested topology is proposed to be a proper choice in low voltage, PV and dynamic voltage restorer (DVR) applications. The presented simulation and experimental results show the validity and effectiveness of proposed topology.
The Ultimate's Detection Capability of Diversely Polarized Antenna Arrays using Higher Order Statistics
Authors: Supakwong Supawat
Published: March 2022

The use of diversely polarized antennas in an array system can significantly improve the overall's array performance. However, its capability does not get utilized to its full potential when the conventional array processing based on the second-order statistic of received signal is employed. The use of higher-order statistic in signal processing is presented in this work, where the performance enhancement is evaluated in terms of an ultimate's array detection capability that represents the system ability to correctly determine the total number of sources present in an environment. The analysis uses the differential geometry as a tool to analyze the geometrical shape of the corresponding diversely polarized manifold for different orders of statistic. Its intrinsic parameter is then used for the derivation of the detection's lower bound. The theoretical framework is supported by computer simulations to examine the detection capability for various types of antenna arrays with different orders of statistic.
An All-Digital PLL Proposal using Gain Control Technique
Authors: Oliveira Vlademir J. S. , Mariani Wagner C. , Grigollo Fábio V.
Published: March 2022

Time-to-digital converter (TDC) has been the main technique used in all-digital phase-locked loops (ADPLL). However, this approach has several design issues, and the solutions to resolve them always increase the complexity of the system. In this paper, an alternative method for handle the frequency error detection using a type II ADPLL architecture is presented. The proposed technique does not perform direct conversion from time to digital, but employs the discrete-time processing of compared signals from phase error detection. This architecture has the advantage of scalability and integration of all-digital techniques and has less complexity than conventional ADPLLs. The derivation of equations for the proposed architecture and its noise analysis is provided. The results are validated through system level simulations using macro-models of the devices. The result of the transient simulation shows the theoretical predictions about the trajectory of output frequency.
A linear least square approach for navigation using ultrasonic waves
Authors: Thong-un Natee
Published: March 2022

In this paper, we present an optional method for position and velocity measurements of navigation by means of echolocation. The proposed idea can localize a moving object with various velocities in three dimensional (3D) spaces. In addition, this method can determine the object’s position and velocity with one-time computation from the original non-linear model using the linear least square-based method.  To satisfy the navigation problem dealing with the additive noise, Color Gaussian Noise is considered mainly for the performance study in computer simulations. The designed system consists of one loudspeaker and four acoustical microphones. An echo received from the microphone is converted into a one-bit stream based on a four-channel delta-sigma-modulation board. Next, FPGA is applied to compute the recursive cross correlation using one-bit signal processing. The object considered as a flying ball is positioned in x-y-z coordinates. Study of position dilution of precision involving with the uncertainty in the object position is also studied. The object’s velocity is calculated using a pair of linear-period-modulated ultrasonic signals. The validity is evaluated by the probability density function (PDF) and the cumulative density function (CDF) from the repeated experimental results.
Nonlinear Adaptive Controller Design for Power Systems with STATCOM via Immersion and Invariance
Authors: Kanchanaharuthai Adirak
Published: March 2022

In this paper, a nonlinear adaptive control of generator excitation and Static Synchronous Compensator (STATCOM) is proposed to enhance the transient stability and voltage regulation of an electrical power system. The proposed controller is designed via an adaptive immersion and invariance (I&I) methodology. In particular, a nonlinear model of the power system including two unknown constant parameters, namely an unknown damping coefficient and an unknown perturbation in mechanical power, is considered. It will be shown that the adapive I\&I control law and the parameter adaptation law proposed can accomplish the convergence of the system states to the real value of unknown parameters. Additionally, they can achieve transient stabilization along with voltage regulations. The adaptive I&I controller is validated using a simulation study on a single-machine infinite bus (SMIB) power system and compared with the standard I&I controller and an adaptive backstepping controller. Simulation results are given to indicate the effectiveness of the proposed controller for the transient stabilization and voltage regulation.
Optimum Threshold for Velocity Considered-SINR Based Vertical Handoff Decision in HetNet
Authors: Widjaja Damar , Uthansakul Peerapong
Published: March 2022

A heterogeneous network (HetNet) that consists of various wireless networks is being massively studied. Integration of the networks should be error free to achieve seamless communication. The seamless vertical handoff (VHO) remains a challenging problem in HetNet studies. Several criteria for VHO decision have been studied in the literature, such as Received Signal Strength (RSS) and Signal to Interference plus Noise Ratio (SINR). It has been shown that SINR based VHO has superior performance compare to RSS based VHO. However, there are some limitations in SINR based VHO scheme. This study aims to overcome those limitations by considering user velocity as an additional criterion for SINR based VHO decision. User velocity is represented in the value of additional SINR threshold. The basic principle of the proposed algorithm is that slow speed user should stay longer in WLAN cells and high speed user should stay longer in WCDMA cells. Simulation results show that there is a trade-off between average throughput and the number of unnecessary handoffs per call. In this study, optimum threshold is obtained when the high percentage of unnecessary handoffs reduction is reached with an acceptable value of average throughput for multimedia data transfer.
Physical insight of junctionless transistor with simulation study of Strained channel
Authors: Vandana B , Patro B S , Das J K , Mohapatra S K
Published: March 2022

The article inquest towards junctionless transistor exploiting channel engineering technique with (Si1-xGex). An accurate and deep understanding of the gated resister with demonstration of lower off-state current, improve on-state drain current and transconductance with its conventional counterpart using numerical simulation. The strain is to improve the electron mobility with high electric field and to reduce the scattering rate across the channel. SGOI-JLCT have a great potential for low power switching applications.
Performance Evaluation of Amplify-Quantize and Forward Protocol for Multi-relay Cooperative Networks
Authors: Nasaruddin Nasaruddin , Mustafa Elizar , Yusnidar Yusnidar
Published: March 2022

Fading which occurs during the process of information transmission can significantly degrade system performance. The cooperative communication system is a well-known diversity technique that is able to mitigate the impact of fading. The relay protocol is the core of such systems. In this research, we evaluated the performance of amplify-quantize and forward (AQF) relays using a hybrid of two protocols: amplify-and-forward (AF) and quantize-and-forward (QF). The outage probability and throughput of multi-relay cooperative networks were derived, and computer simulation was used to evaluate the impact of a number of parameters on the performance of the AQF relay for multi-relay cooperative networks. We also compared the outage probability and throughput of AF, QF, and direct link networks. The outage probability of AQF decreased as the number of relays increased, whereas the throughput increased. We demonstrated that amplification values and quantization levels have a significant impact on the performance of AQF multi-relay networks. Overall, AQF performed better in terms of outage probability and throughput than AF and QF, for multi-relay cooperative networks.
Nonlinear Model Based Single-Loop Control of Interleaved Converters for a Hybrid Source System
Authors: Thammasiriroj Warit , Chunkag Viboon , Phattanasak Matheepot , Pierfederici Serge , Davat Bernard , Thounthong Phatiphat
Published: March 2022

Generally, fuel cell (FC) power supplies cannot respond fast enough to dynamic load requirements. This research presents an energy management system for hybrid power sources in dc distribution systems. A supercapacitor (SC) module was designed to be the second power source in order to supply energy in transient, which can respond well to dynamic loads. In terms of circuits, a two-phase parallel boost converter was connected to each power source for regulating the output voltage. The interleaved technique was applied for reducing the current ripples of the sources. Flatness control, which is a nonlinear estimation technique, combined with a single-loop control strategy is proposed to control the system and it responds faster than multiple-loop controls. In this research, it included a hybrid system of two power sources namely a 500-W fuel cell emulator and a 165-F supercapacitor module, each connecting to a two-phase interleaved boost converter. The control algorithm for the hybrid system was developed and validated by the MATLAB-Simulink interfacing with a dSPACE 1103 controller card. The experimental results showed the rapid response of the proposed system to the dynamic load requirement. This confirmed that the single-loop flatness control is a potential algorithm that offers stabilization of the hybrid system.
Determination of Power System Topological Observability using Improved Hopfield Neural Network
Authors: Reddy S. Surender , Jung Chan-Mook
Published: March 2022

This paper formulates the power system Topological Observability (TO) problem as an integer programming problem, and develops a new methodology based on Improved Hopfield Neural Network (IHNN) for the determination of TO in power system networks. These complex power systems require accurate and efficient controls that makes the control centers to work efficiently. These control centers are equipped with Supervisory Control and Data Acquisition (SCADA) systems allowing to acquire information about the power system, and its transmission to control centers in real time. The computations in real time environment are reaching a limit, as far as conventional computer based algorithms are concerned. Hence, it is required to find out newer methods for these applications, which can be implemented on hardware to outperform their software counterpart. Therefore, this paper solves the TO problem using IHNN. This algorithm is based on neural networks and can easily be implemented on dedicated hardware.