| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-13 |
| Abstraksi Narasi | : | Salah satu keuntungan dari pengembangan perangkat lunak berbasis obyek adalah dukungannya terhadap kemungkinan pemanfaatan kembali (reuse) komponen-komponen perangkat lunak tersebut dalam berbagai proyek pengembangan perangkat lunak yang lain. Sekalipun demikian, sebagaimana disebutkan oleh Gamma et. al. (1995), pengembangan perangkat lunak berbasis obyek yang komponennya dapat dimanfaatkan kembali (reusable) jauh labih sulit lagi. Kunci dari perancangan (desain) perangkat lunak berbasis obyek yang bersifat reusable adalah melalui penemuan suatu pola yang dapat menggambarkan obyek-obyek dan kelas-kelas yang saling berkomunikasi. Pola tersebut harus dapat dimodifikasi untuk digunakan dalam pemecahan problem perancangan perangkat lunak dalam berbagai konteks yang berlainan. Tulisan ini memaparkan lebih lanjut pengertian pola desain (design pattern) suatu perangkat lunak, bagaimana mendeskripsikan dan menuliskan pola-pola desain, serta bagaimana mempergunakan pola-pola desain sedemikian hingga dapat membantu perancang perangkat lunak menghasilkan rancangan secara cepat. Di samping itu, tulisan ini juga memaparkan pentingnya pola desain dalam pengembangan perangkat lunak berbasis obyek, serta kecenderungan-kecendurangn di masa mendatang yang terkait dengan pola desain. |
| Nama Pengarang | : | Polina, Agnes Maria, Paulina Heraningsih Prima Rosa, F. Soesianto, A. Atmadi, PK Purwadi, Sumarno, Linggo, Wilardjo, B. Djoko Untoro Suwarno, R. Soemantri |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 81-87 |
| Abstraksi Narasi | : | Pada awalnya metode studi kasus hanya cocok digunakan di bidang penelitian ilmu sosial. Kemudian studi kasus mulai digunakan dalam berbagai macam penelitian seperti di bidang teknologi dan implementasi mikrokomputer. Mungkinkan penelitian-penelitian di bidang sistem informasi dilakukan dengan metode studi kasus? Dari berbagai macam penelitian di bidang sistem informasi dengan metode studi kasus yang dilakukan akhir-akhir ini di berbagai penjuru dunia, penulis dapat menarik kesimpulan bahwa metode studi kasus dapat diterima sebagai salah satu metode untuk penelitian di bidang sistem informasi. Lebih dari itu, metode studi kasus dalam penelitian sistem informasi memiliki keunggulan karena dapat diterapkan dalam berbagai macam cara seperti dapat menggunakan pendekatan deduktif atau induktif, penelitian dapat dilakukan secara kualitatif maupun kuantitatif, dapat menyelidiki satu kasus maupun banyak kasus, dan berbagai kombinasi yang lain. |
| Nama Pengarang | : | Maslichah Asyari |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 58-66 |
| Abstraksi Narasi | : | Many species of plants belong to parasites. They can be classified into two major groups: stem parasites and root parasites. Parasitism may be total or partial. The existence of parasitic plants can be effective if we refer to the characteristics of parasitism. Nevertheless, not all parasitic plants need to be wiped out, because some of them have good potential as material for drugs, perfumes, handycrafts, and even for tourism objects. |
| Nama Pengarang | : | Sri Agustini Sulandari |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 34-43 |
| Abstraksi Narasi | : | Many of the properties of a single-mode fiber can be used to quickly generate various types of fiber sensors. The length and index refraction of this fiber will change when it is subjected to an environmental perturbation. Interferometric techniques may be used to sense these changes with accuracies that match or surpass those achieved with conventional sensors technology. Otical fibers are used to sense environmental effects in two distinct ways, i.e. extrinsic and intrinsic sensing. The fiber may be used strictly as information carriers that lead up to ablack box to impress information on a light beam that propagates to a remote receiver through the same fiber. The second type of fiber sensor relies on the properties of the optical filber itself to convert an environmental action into a modulation of the light beam passing through it. The typical single mode all-fiber interfetion of the light beam passing through it. The typical single mode all-fiber interferometer is an intrinsically quiet device. Usually, most noise problems with these systems are due to perturbations of the fiber arms, causing unwanted phase shifts. This paper discusses the interferometric-based and phase modulation in optical fiber devices, the Mach-Zehnder and Michelson interferometer sensors, which have important applications, and finally thermal effects to the sensing fiber. |
| Nama Pengarang | : | Maria Dwi Budi Jumpowati |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 75-80 |
| Abstraksi Narasi | : | Natural pesticide is one of the alternatives that can be used as a substitute to synthetic pesticide. It has been widely known that synthetic pesticide causes damage to human health, environmental balance, and non-target organism. The objective of this paper is to classify various kinds of plants functioning as insecticide and repellent, and to show how process them using simple methods. These methods of processing have been applied in rural areas which have cultivated sustainable farming. |
| Nama Pengarang | : | J. Eka Priyatma |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 16-26 |
| Abstraksi Narasi | : | Relational Algebra is a formal query language for retrieving information from relational databases in which each database contains only precise data. This paper presents a scenario on how to extend the Relational Algebra to one which is capable of dealing with databases containing incomplete or uncertain data. The scenario uses possibility theory to represent incomplete or uncertain data and to extend the Relational Algebra as well. |
| Nama Pengarang | : | L.Wilardjo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 27-33 |
| Abstraksi Narasi | : | Derivation of the differential equation of electromagnetic wave from Max-well`s equations and the constitutive relations between the field vectors was given. This differential equation was then changed to the form appropriate for guided electromagnetic wave. Finally, the relations between the transverse and the longitudinal components of the fields in the guided electromagnetic wave were deduced using the general form of guided wave and the two `curl equations` in the Max-well`s equations. |
| Nama Pengarang | : | PK Purwadi |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-15 |
| Abstraksi Narasi | : | This article discusses the solution to conduction heat transfer problem under steady state and two-dimensional conditions with no energy generation or no heat sources. A convenient equation used in this case is the two-dimensional Laplace equation, which is known as the elliptic equation. Among the solution methods discussed in this paper, the Alternating Direction Implicit (ADI) method with relaxation parameter w), which requires the smallest number of iterations and has a much faster convergence rate compared to the other methods, is considered the best. |
| Nama Pengarang | : | Maria Agustiani |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 51-57 |
| Abstraksi Narasi | : | A matrix A with entries in a commutative ring R with unity is left good if, for every vector x, the ideal generated by entries in the vector xA is the same as the ideal generated by the entries in the vector x. In the context of matrices with integral entries, this is equivalent to requiring that the greatest common divisor of the entries in xA is the same as greatest common divisor of the entries in x. Since, for any matrix A and vector x, it is obvious that ... , the content of leftgoodness is in the reverse containment. |
| Nama Pengarang | : | Asan Damanik |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 44-50 |
| Abstraksi Narasi | : | According to Standard Model Particle Physics,neutrinos (ve, vm, vt) with electron ...., muon (m), and tau (t) are classified as lepton family. Leptonic particles undergo weak interactions and short range. The electron, muon, and tau have non-zero mass and carry charges, but neutrinos have zero mass and are neutral. Therefore, it is very difficult to detect the presence of neutrinos in the laboratory. Massless neutrinos are relevant to the gauge invariance principle and symmetry as a foundation of leptonic quantum number conservation law. Many experiments performed since 1931 uo to 1997 in measuring neutrino mass failed to observe neutrino oscillation, because oscillation is a direct consequence of particles having non-zero mass. But, in the International Physics Conference `Neutrino 98` held in Takayama, Japan, the Super-Kamiokande team claimed that they had observed neutrino oscillation while it iwas travelling in the medium. According to the Super-Kamiokande team, the heaviest neutrino probably has a mass of about 0.05 eV. If neutrino has non-zero mass, the leptonic quantum number conservation law will be violeted and the Standard Model must be extended to accomodate neutrino mass. Another implication of neutrino having non-zero mass is the possibility of placing neutrino as the dark mass and the missing mass in cosmology and astrophysics. |
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