| Nama Pengarang | : | A. Bayu Primawan |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 117-125 |
| Abstraksi Narasi | : | Internet sebagai sebuah jaringan komputer global semakin berkembang dengan aplikasi-aplikasi yang berbasis protokol TCP/IP. Telepon internet merupakan salah satu aplikasi dari telepon yang berbasis protokol internet. Pada prinsipnya sistem in sama dengan aplikasi lainnya, yaitu data dikemas dalam packet-sitching dan ditransmisikan melalui protokol internet. Dasar dari telepon internet adalah perangkat telepon yang dilengkapi alamat IP. Bila dihubungkan dengan sentral PABX diperlukan Gateway sebagai gerbang dalam jaringan internet, Command Center Server sebagai pengendali pusat yang berisi basis-data untuk proses-proses kontrol dan manajemen, serta perangkat lunak yang mendukungnya. Proses perancangan dan aplikasi sistem telepon internet dimulai dengan menghitung kebutuhan akan kapasitas jaringan dalam melayani percakapan telepon, dan kemudian menghitung jumlah perangkat yang dibutuhkan. Aplikasi telepon internet secara umum dapat mereduksi biaya percakapan telepon internasional karena jaringan internet yang dapat diakses secara lokal. |
| Nama Pengarang | : | Maria Dwi Bud1 Jumpowati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 177-184 |
| Abstraksi Narasi | : | A research on the ecophysiology of secondary metabolism in drug plants is important to improve the cultivation of drug plants. Secondary metabolism in drug plants is influenced by ecologycal factors, such as the area where they are growing, the climate, the canopy, the water and sun-ray availability, etc. Appropriate ecologycal factors activate biochemical reactions in the plants and thus increase growth activities. Various parts of the plants, such as roots, barks, leaves, flowers, fruits and seeds, grow actively, increasing biomass products and abundant drug materials. |
| Nama Pengarang | : | Sangadji |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 151-156 |
| Abstraksi Narasi | : | Telah diketahui bahwa transformasi Berezin dapat digunakan untuk mengkarakterisir kekompakan operator-operator Toeplitz dengan simbol-simbol radial pada ruang Fock. Dalam makalah ini dibahas dan dibuktikan bahwa transformasi Berezin juga dapat digunakan untuk mengkarakterisir kekompakan operator-operator Toeplitz dengan simbol-simbol radial pada ruang Fock harmonik. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 15-28 |
| Abstraksi Narasi | : | In this paper we derive the Laplace Transform f(z) = ...... of a function ...., with a complex variable z, as a generalization of a power series ......., by replacing the variable w with e^-z and the integral exponent n with a continuous variable t. With such approach it is not surprising that many of the properties of the integral formula of the Laplace Transform can be correctly conjectured by the corresponding ones of the power series. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 55-68 |
| Abstraksi Narasi | : | A comparative study between three disc arm scheduling algorithms, i.e. First Come First Served (FCFS) algorithm, Shortest Seek First (SSF) algorithms and Elevator algorithm is descibed. The simulation on scheduling algorithms was implemented in Pascal language and used an external disc drive connected via a parallel port to serve requesting tracks. FCFS algorithm is easy to implement but worse in total length of disc arm traveling. SSF and Elevator algorithms are harder to implement compared to the FCFS algorithm. In SSF, the disc drive head tends to move around the middle tracks, resulting in poor response time. Elevator algorithm shows minimum response time and minimum total length of disc arm traveling. In elevator algorithm all tracks are served equally. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 37-43 |
| Abstraksi Narasi | : | Analogiocal inference was used to give one of the two constants of integration in the solution of the Hertz potential differential equation its proper physical interpretation. Thereby, the differential equation which supposedly is valid only in a sourceless region could be used electromagnetic wave in the Fraunhofer zone, whose source is a sinusoidally pulsating Hertzian dipole. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 45-53 |
| Abstraksi Narasi | : | Based on signal segmentation, two methods of Finite Impulse Response (FIR) filtering can be implemented using Discrete Cosine Transform (DCT) i.e. overlap-add and overlap-save. The FIR filtering using overlap-save method based on DCT has been proven (Sumarno, 1999). In this paper we prove the overlap-add method for FIR filtering based on DCT. The simulation of digital FIR filtering with an overlap-add method based on DCT shows that this kind of FIR filtering has similar performance compared to that of the overlap-save, including ripple and signal attenuation in the pass band. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 69-79 |
| Abstraksi Narasi | : | The problem of conduction heat transfer, under unsteady state, and two-dimensional conditions with no energy generation or no heat sources can be solved by using a finite difference method, such as Alternating Direction Implicit (ADI) method. The ADI method is accurate and unconditionally stable. To overcome the weaknesses and inefficiency of other methods (the explicit and implicit finite difference equation), the ADI method uses a splitting technique which is popular for two-dimensional problems. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 29-36 |
| Abstraksi Narasi | : | Hydrogenated amorphous-microcrystalline silicon (a-Mc-Si:H) is a new fast growing thin film semiconductor. The growing interest in a-Mc-Si:H is due to two main factors: 1) The possibility to produce a-Mc-Si:H simply by modifing some of the deposition paramters used for preparation of hydrogenated amorphous silicon (a-Si:H) is attractive from the application point of view, and 2) As its structure lies between purely amorphous and polycrystalline phase, the material is interesting from the physicist;s point of view. The a-Mc-Si:H, together with a-Si:H, are potential new materials for optoelectronic devices such as solar cells, flat panel displays and large area microelectronics. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 89-94 |
| Abstraksi Narasi | : | In this paper we discuss the relevance and meaning of Criteria 2000 formulated by the Accreditation Board for Engineering and Technology (ABET) from the philosophical point of view in the context of the advancement of higher engineering education in Indonesia. The most important point to be considered is how to make the higher engineering education program communicative, creative, competitive, and to enhance the students` motivation to grow towards integral, mature, and self-reliant persons. |
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