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Fractals in the twist-and-flip circuit
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| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Proceedings of the IEEE |
| Volume / Edisi | : | 81-10, OCTOBER (No. 10) |
| Halaman | : | 1466-1491 |
| Abstrak | : | The twist-and-flip circuit contains only three circuit elements: two linear capacitors connected across the ports of a gyrator characterized by a nonlinear gyration conductance function g(v/sub 1/, v/sub 2/). When driven by a square-wave voltage source of amplitude a and frequency omega , the resulting circuit is described by a system of two nonautonomous state equations. For almost any choice of nonlinear g(v/sub 1/, v/sub 2/)>0, and over a very wide region of the a- omega parameter plane, the twist-and-flip circuit is imbued with the full repertoire of complicated chaotic dynamics typical of those predicted by the classic KAM theorem from Hamiltonian dynamics. The significance of the twist-and-flip circuit is that its associated nonautonomous state equations have an explicit Poincare map, called the twist-and-flip map, thereby making it possible to analyze and understand the intricate dynamics of the system, including its many fractal manifestations. The focus is on the many fractals associated with the twist-and-flip circuit.<> |
PERANAN SASTRA DALAM PEMBAKUAN BAHASA
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VII/1 (No. 1) |
| Halaman | : | 23-31 |
| Abstrak | : | - |
Fractal image coding: a review
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Proceedings of the IEEE |
| Volume / Edisi | : | 81-10, OCTOBER (No. 10) |
| Halaman | : | 1451-1465 |
| Abstrak | : | An approach to image coding based on a fractal theory of iterated contractive transformations defined piecewise is described. The main characteristics of this approach are that it relies on the assumption that image redundancy can be efficiently captured and exploited through piecewise self-transformability on a block-wise basis, and it approximates an original image by a fractal image, obtained from a finite number of iterations of an image transformation called a fractal code. This approach is referred to as fractal block coding. The general coding-decoding system is based on the construction, for an image to be encoded, of a fractal code-a contractive image transformation for which the original image is an approximate fixed point-which, when applied iteratively on any initial image of the decoder, produces a sequence of images which converges to a fractal approximation of the original. The design of a system for the encoding of monochrome digital images at rates below 1 b/pixel is described. Ideas and extensions from the work of other researchers are presented.<> |
POLA PEMAKAIAN BAHASA KELUARGA PERKAWINAN CAMPURAN JAWA-SUNDA DI DKI JAKARTA
| Pengarang | : | Lumintaintang, Yayah B. |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VII/1 (No. 1) |
| Halaman | : | 2-22 |
| Abstrak | : | - |
Wavelet-based representations for the 1/f family of fractal processes
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Proceedings of the IEEE |
| Volume / Edisi | : | 81-10, OCTOBER (No. 10) |
| Halaman | : | 1428-1450 |
| Abstrak | : | It is demonstrated that 1/f fractal processes are, in a broad sense, optimally represented in terms of orthonormal wavelet bases. Specifically, via a useful frequency-domain characterization for 1/f processes, the wavelet expansion's role as a Karhunen-Loeve-type expansion for 1/f processes is developed. As an illustration of potential, it is shown that wavelet-based representations naturally lead to highly efficient solutions to some fundamental detection and estimation problems involving 1/f processes.<> |
Signal compression based on models of human perception
| Pengarang | : | N. Jayant |
| Nama Majalah/Jurnal | : | Proceedings of the IEEE |
| Volume / Edisi | : | 81-10, OCTOBER (No. 10) |
| Halaman | : | 1385-1422 |
| Abstrak | : | The notion of perceptual coding, which is based on the concept of distortion masking by the signal being compressed, is developed. Progress in this field as a result of advances in classical coding theory, modeling of human perception, and digital signal processing, is described. It is proposed that fundamental limits in the science can be expressed by the semiquantitative concepts of perceptual entropy and the perceptual distortion-rate function, and current compression technology is examined in that framework. Problems and future research directions are summarized.<> |
Malam Minggu di Kampung Baduy
| Pengarang | : | Alexius Aji Pradana, SJ |
| Nama Majalah/Jurnal | : | Rohani |
| Volume / Edisi | : | 72 (No. 06) |
| Halaman | : | 20-24 |
| Abstrak | : | Ketika mendengar tentang Masyarakat Baduy, biasanya asosiasi yang muncul adalah hidup jauh dari teknologi don modernitas. Bagi masyarakat umum di perkotaan, hidup berjarak dengan teknologi maupun modernitas adalah momok. Hidup seperti itu kerap dilihat sebagai tertinggal, kuno, susah, menderita, don sebagainya. Akan tetapi, rupa-rupanya memberi jarak terhadap teknologi don modernitas tidak selalu berarti demikian. Perjumpaan singkat dengan Masyarakat Baduy don cara hidup mereka justru mengajarkanku keutamaan­keutamaan yang berharga. |
Thelma Estrin, biomedical engineer: a pioneer of applied computing
| Pengarang | : | F. Nebeker |
| Nama Majalah/Jurnal | : | Proceedings of the IEEE |
| Volume / Edisi | : | 81-10, OCTOBER (No. 10) |
| Halaman | : | 1370-1382 |
| Abstrak | : | An account is given of the career of Thelma Estrin. Estrin entered engineering because of the urgent need for workers in the defense industries during World War II. After earning a Ph.D degree in electrical engineering in 1951, she worked in medical electronics (mainly electroencephalography) and on the design and construction of a digital computer (the WEIZAC). In 1960 she began a long association with UCLA's Brain Research Institute, where she organized and directed the Data Processing Laboratory. Estrin pioneered in the application of computers to biomedical research-especially in the areas of data acquisition and graphic display-and health-care delivery. In addition, she has done much to increase the number of women in engineering, both by direct efforts to assist others and by providing a role model.<> |
Dari Asia ke Eropa: Perutusan Cinta yang MenyeberangiBenua
| Pengarang | : | Camilla De Fatima, OSF |
| Nama Majalah/Jurnal | : | Rohani |
| Volume / Edisi | : | 72 (No. 06) |
| Halaman | : | 16-19 |
| Abstrak | : | Tak pernah kubayangkan bahwa hidup akan membawaku sejauh ini-meninggalkan Indonesia, tanah kelahiranku, don menetap di Roma sebagai seorang misionaris. lni bukan sekadar perpindahan tempat, melainkan sebuah perjalanan jiwa. Sebuah kisah tentang dipanggil don diutus, serta dibentuk kembali oleh tangan Tuhan yang setia. Dalam segala hal aku percaya, Deus Providebit, Tuhan akan menyelenggarakan. |
Menghadirkan Wajah Allah di Eropa
| Pengarang | : | Karina Yuyun Katharina, PK |
| Nama Majalah/Jurnal | : | Rohani |
| Volume / Edisi | : | 72 (No. 06) |
| Halaman | : | 12-15 |
| Abstrak | : | Di Kopel Rumah lnduk Puteri Kasih di Paris, Prancis, terdapat lukisan yang menggambarkan peristiwa penampakan Santa Perawan Maria pada Santa Katharina Laboure tahun 1830. Setiap kali soya meman­dangnya, selalu muncul kekaguman dalam hati soya akan karya keselamatan Allah bagi manusia. Dalam lukisan itu, tangan Santa Katharina Laboure ado di pangkuan Bunda Maria. lni menunjukkan adanya relasi yang sangat dekat di antara keduanya: relasi antara Sang lbu don anaknya, antora Bunda Maria don Gereja. |