20 research outputs found
PENGEMBANGAN BUKU AJAR TEKNOLOGI JARINGAN BERBASIS LUAS (WAN) UNTUK SMK KELAS XI PROGRAM KEAHLIAN TEKNIK KOMPUTER DAN JARINGAN SMK NEGERI 1 REJOTANGAN
No full textABSTRAK Zinan, Mochammad . 2018. Pengembangan Buku Ajar Teknologi Jaringan Berbasis Luas (WAN) Untuk SMK Kelas XI Program Keahlian Teknik Komputer dan Jaringan SMK Negeri 1 Rejotangan. Skripsi. Program Studi Pendidikan Teknik Informatika, Fakultas Teknik, Universitas Negeri Malang. Pembimbing: (I) Dr. Ir. H. Syaad Patmanthara, M.Pd. (II) M. Zainal Arifin, S.Si,M.Kom. Kata Kunci: Buku Ajar, Teknologi Jarinngan Berbasis Luas, WAN, Pengembangan Proses pembelajaran tidak lepas dari pembahasan materi-materi rujukan, dapat berupa buku, media elektronik, dan lain-lain. Perubahan kurikulum berimbas pada perubahan mata pelajaran dan pada buku ajar yang digunakan pada proses pembelajaran. Mata pelajaran Teknologi Jaringan Berbasis Luas (WAN) belum ada, meskipun beberapa materi didalamnya sudah terdapat pada mata pelajaran lain di kurikulum 2013 sebelumnya. Praktek dilapangan menunjukkan bahwa di SMK Negeri 1 Rejotangan belum memiliki buku ajar yang sesuai dengan mata pelajaran Teknologi Jaringan Berbasis Luas berakibat bahwa kurangnya kesesuaian materi dengan kurikulum yang berlaku. Pengembangan ini menghasilkan buku ajar yang sesuai dengan kurikulum 2013 Edisi Revisi. Tujuannya adalah membantu siswa-siswi untuk mendapatkan buku ajar yang sesuai. Penelitian pengembangan ini menggunakan metode R&D (Research and Development) langkah pengembangan menurut Borg & Gall adalah pengumpulan data, validasi produk oleh ahli materi dan ahli media, revisi hasil validasi, uji coba lapangan (kelompok kecil), revisi hasil uji coba produk, uji coba lapangan dan revisi produk. Pengembangan ini menggunakan analisis kuantitatif dan kualitatif. Teknik kuantitatif digunakan untuk menganalisis data dari hasil angket, validasi ahli materi dan ahli media, dan analisis kualitatif didapatkan dari masukan dari pembimbing tentang produk yang sedang dikembangkan. Proses pengambilan data dimulai dengan melakukan wawancara kepada KaProdi TKJ SMK Negeri 1 Rejotangan. Sumber data penelitian diperoleh dari responden siswa-siswi kelas XI program keahlian Teknik Komputer dan Jaringan, ahli materi, dan ahli media. Pengambilan data diperoleh dengan mengisi angket yang diberikan kepada masing-masing responden. Jumlah responden dari siswa-siswi terdapat 36 orang, dengan pembagian 13 orang untuk kelompok kecil dan 23 siswa untuk kelompok besar, dari pihak ahli materi 1 orang dan ahli media 1 orang. Produk pengembangan ini berupa buku ajar Teknologi Jaringan Berbasis Luas (WAN) untuk kelas XI. Hasil dari angket uji coba siswa-siswi kelompok kecil 88,7% (valid), kelompok besar 89,3% (valid). Rerata nilai uji coba sebesar 89%, dengan kesimpulan bahwa Produk Pengembangan Buku Ajar Teknologi Jaringan Berbasis Luas dinyatakan valid dan layak untuk digunakan
Unbiasedness of simultaneous independent measurement
No full textWe manage to get the true parameter value out of biased data without any zero calibration, a result which has not been reported to our knowledge. In order to obtain the true value of a given physical quantity out of biased noises, a general model and an algorithm based on simultaneous independent measurements are demonstrated. A decision function is constructed using variable measuring vectors. A nonlinear estimator is provided using linear combinations of differential statistics of initial observations. Repeated gyroscope experiments targeting the Earth's local rotation velocity are implemented to validate the algorithm and the estimator. Experimental results show that the true rotation velocity is obtained even if initial observations are either positively or negatively biased. Therefore, it is possible to get the true value of a physical quantity using simultaneous multi-dimensional measurements, no matter whether systematic biases exist or not. This reveals a phenomenon that physical observations, even though obscured by time-varying biases and noises, have an intrinsic true-value feature which has not been made use of in current theories and applications.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000306366600013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, MultidisciplinaryInstruments & InstrumentationSCI(E)EI1ARTICLE8null2
Optically compensated dual-polarization interferometric fiber-optic gyroscope
No full textWe first introduce optical compensation into the field of interferometric fiber-optic gyroscopes (IFOGs), using the opposite polarity of the disturbance between two orthogonal polarization states to suppress polarization-fluctuation-induced noise. A dual-polarized IFOG, in which the fast and slow axes of polarization-maintaining fiber work simultaneously, is implemented and tested. Interference signals of the two axes are added to achieve optical compensation. Experiments show that the IFOG's sensitivity is effectively enhanced in compensated output: all Allan variance indices are improved, among which bias instability is reduced from 0.335 and 0.227 deg/h (fast and slow axes output, respectively) to 0.061 deg/h. (c) 2012 Optical Society of Americahttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000306709900024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701OpticsSCI(E)EIPubMed16ARTICLE142841-28433
Thermal Tolerance and Prediction of Northern Distribution of the Crapemyrtle Bark Scale (Hemiptera: Eriococcidae)
Get PDF© 2019 The Author(s). Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. Physiological limits of non-native species to environmental factors are critical for their establishment and spread in the adventive range. The crapemyrtle bark scale, Acanthococcus lagerstroemiae (Kuwana), is a major pest of crapemyrtles. Despite concerns on its rapid spread, there is a lack of information on potential distribution range of this scale in the United States. To understand this scale\u27s distribution potential, its thermal tolerance was evaluated using higher and lower thermal limits. Exposure time leading to 50 and 90% mortality (Lt50 and Lt90) at extreme low or high temperatures were measured under controlled conditions. A model was then built to fit temperature data of cold fronts from 2001 to 2016 and to calculate potential mortalities along latitudes. Isothermal lines delineated at 90% mortality were defined as the northern limits. Modeling results suggested that A. lagerstroemiae nymphs collected in summer could tolerate heat; however, they were more susceptible to cold temperatures. Laboratory assays suggested that cold tolerance of A. lagerstroemiae nymphs varied from summer to winter. For example, SCP of nymphs collected in summer was higher than those collected in fall (-21 vs. -27°C), and the exposure time leading to Lt90 at 0°C was also different, which were 8 versus 50 h comparing nymphs collected in summer versus fall. Our prediction suggested that A. lagerstroemiae is likely to be limited by cold temperatures along the 43° N latitude. Based on these results, integrated management strategies can be developed for A. lagerstroemiae within the predicted range
Dialogue Session Segmentation by Embedding-Enhanced TextTiling
No full textIn human-computer conversation systems, the context of a user issued utterance is particularly important because it provides useful background information of the conversation. However, it is unwise to track all previous utterances in the current session as not all of them are equally important. In this paper, we address the problem of session segmentation. We propose an embedding-enhanced TextTiling approach, inspired by the observation that conversation utterances are highly noisy, and that word embeddings provide a robust way of capturing semantics. Experimental results show that our approach achieves better performance than the TextTiling, MMD approaches.National Natural Science Foundation of China (NSFC Grant) [61272343, 61472006]; Doctoral Program of Higher Education of China [20130001110032]; National Basic Research Program (973 Program) [2014CB340405]CPCI-S(ISTP)CPCI-SSH(ISSHP)2706-271
Multidimensional gray-wavelet processing in interferometric fiber-optic gyroscopes
No full textA multidimensional signal processing method for a single interferometric fiber-optic gyroscope (IFOG) is proposed, to the best of our knowledge, for the first time. The proposed method, based on a novel IFOG structure with quadrature demodulation, combines a multidimensional gray model (GM) and a wavelet compression technique for noise suppression and sensitivity enhancement. In the IFOG, two series of measured rotation rates are obtained simultaneously: an in-phase component and a quadrature component. Together with the traditionally measured rate, the three measured rates are processed by the combined gray-wavelet method. Simulations show that the intensity noise and non-reciprocal phase fluctuations are effectively suppressed by this method. Experimental comparisons with a one-dimensional GM(1, 1) model show that the proposed three-dimensional method achieves much better denoising performance. This advantage is validated by the Allan variance analysis: in a low-SNR (signal-to-noise ratio) experiment, our method reduces the angle random walk (ARW) and the bias instability (BI) from 1 x 10(-2) deg h(-1/2) and 3 x 10(-2) deg h(-1) to 1 x 10(-3) deg h(-1/2) and 3 x 10(-3) deg h(-1), respectively; in a high-SNR experiment, our method reduces the ARW and the BI from 9 x 10(-4) deg h(-1/2) and 5 x 10(-3) deg h(-1) to 4 x 10(-4) deg h(-1/2) and 3 x 10(-3) deg h(-1), respectively. Further, our method increases the dimension of the state-of-the-art IFOG technique from one to three, thus obtaining higher IFOG sensitivity and stability by exploiting the increase in available information.Engineering, MultidisciplinaryInstruments & InstrumentationSCI(E)EI0ARTICLE11null2
Design and Test of Prototype Attitude Control System as Telescope Stabilizer with Fiber Optic Gyroscopes
No full textwhile interferometric fiber optic gyroscopes (IFOGs) are used in the inertial guidance area as replacements for traditional spinning rotor gyroscopes, the presence of optical noise as well as cost of such systems demonstrate that IFOGs still have not been optimized for this purpose. This paper proposes a solution to these problems, describing the design details and features of an optimized prototype attitude control system that uses depolarized IFOGs in the gyros and mounts depolarizers simultaneously on the entrance and exit of the fiber loop. Preliminary tests of an attitude control system built using these IFOGs demonstrate that this relatively low-cost system achieved the objective of compensating for the earth's spin and thus could be deployed as a system for the stabilization of telescopes.Engineering, Electrical & ElectronicRemote SensingOpticsEICPCI-S(ISTP)
Polarization nonreciprocity suppression of dual-polarization fiber-optic gyroscope under temperature variation
No full textPolarization nonreciprocity (PN) is one of the most critical factors that degrades the performance of interferometric fiber-optic gyroscopes (IFOGs), particularly under varying temperature. We present an experimental investigation of PN error suppression in a dual-polarization IFOG. Both experimental results and theoretical analysis indicate that the PN errors of the two orthogonally polarized light waves always have opposite signs that can be effectively compensated despite the temperature variation. As a result, the long-term stability of the IFOG has been significantly improved. This study is promising for reducing the temperature fragility of IFOGs. (C) 2015 Optical Society of America973 Program of China [2013CB329205]; National Natural Science Foundation of China [61307089]SCI(E)[email protected]
Dual-polarization interferometric fiber-optic gyroscope with an ultra-simple configuration
No full textWe demonstrate a novel dual-polarization interferometric fiber-optic gyroscope (IFOG), which needs only one coupler and no polarizer. Polarization nonreciprocity (PN) errors in common IFOGs will increase significantly if the polarizer is absent, or if only one coupler is used. In our setup, however, PN errors are effectively compensated by using two balanced polarizations. The 2 km coil, open-loop configuration obtains a bias instability of 0.02 degrees/h in detecting the Earth's rotation rate. Its performance difference from the conventional two-coupler IFOG is only a stable bias, caused by coupler nonreciprocity. (C) 2014 Optical Society of AmericaOpticsSCI(E)[email protected]
