| Nama Pengarang | : | Sri Hartini, Yustina |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-6 |
| Abstraksi Narasi | : | A Study of the anti-inflammatory effect of ethanolic extract of teki (Cyperus rotundus, L) on artificial oedema produced in Wistar male albino rats (Rattus mavergicus) has been carried out. The rats were infused with carrageenin, one hour after intra peritoneal administration of ethanolic extract of teki corm, indometasin (non steroid group) and prednison (steroid group). Indometasin and prednison are anti-inflammatory used as control. The result shows the ethanolic extract of teki corm has anti-inflammatory effect 16,79% lower than indometasin at dosage 18 mg/kg body weight and 32,19 % than prednison at dosage 9 mg/kg body weight. |
| Nama Pengarang | : | FA. Rusdi Sambada |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 83-96 |
| Abstraksi Narasi | : | A important process in most industrial plants is the rejection of waste heat into the atmosphere. Water is the most common cooling medium, and conservation principle requires that the resulted warm water is recooled and recirculated by the use of cooling towers. A cooling tower is a direct contact heat exchanger in which warm water is discharged to the top of a packing system contained in a tower construction. This process is best explained in context of a counterflow arrangement, in which the cooling of the water and heating of the air can be studied in one unit of tower plan area. The heat exchange process is of dual nature in that sensible heat is transferred by the temperature difference between the water and the air, and latent heat is transferred by evaporation of small proportion of the water into the air. |
| Nama Pengarang | : | Johanes Eka Priyatma |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 57-69 |
| Abstraksi Narasi | : | Despite of its advantages, the relational data base model has two main weaknesses, namely it could not be used to accomodate data that have repeated fields and it would not be efficient for storing the variable field (attribute). This research aims to develop some techniques to modify the relational database model including its RDBMS (Relational Data Base Management System), in such a way that the relational model still can be used to store the repeated fields and at the same time could save the space. The three main activities of this research are (1) proposing new structure of relational data model, (2) developing its suitable Relational Algebra, and (3) testing the proposed structure by developing computer programs to check whether its suitable Relational Algebra could be easily implemented. This research also measures the space efficiency of the proposed structure compared to the ordinary relational model structure. The data used for developing and testing the program were converted from ISO 2709 format data taken from Sanata Dharma University library. The first result of this research is that the proposed structure solves the problem of repeated fields and/or variable field. The second results is that the fundamental operations of Relational Algebra can be found and developed through its RDBMS. The research also shows that the proposed structure has no problem with indexing and in fact increases the space efficiency. |
| Nama Pengarang | : | Frans Susilo |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 42-56 |
| Abstraksi Narasi | : | Fuzzy logic is a system of reasoning, which was developed as a kind of extension of two-valued classical logic.It belongs to the family of infinite-valued logics whose truth values are represented by all real numbers in the closed interval [0,1]. One of the most fundamental rules of inference in logic is modus ponens, whic can be generalized within the framework of fuzzy logic. This generalization is based on the so-called compositional rule of inference. The method of interpolation is a special case of the compositional rule of inference and is employed in the multiconditional approximate reasoning. In this paper we discuss the application of fuzzy logic in the field of fuzzy control system, which is utilized to control various kinds of process using rules of inference based on fuzzy logic. |
| Nama Pengarang | : | St. Susento |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 27-41 |
| Abstraksi Narasi | : | There exist interesting structural similarities between the Green function of linear, ordinary differential equations with constant coefficients, and the fundamental solution of distributional differential equations. With these similarities in the background, we prove a necessary and sufficient condition required for some function G(t) to be the Green function of certain differential equations. Moreover, a close relationship between the solutions of those differential equations can be verified. |
| Nama Pengarang | : | lg. Aris Dwiatmoko |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 12-26 |
| Abstraksi Narasi | : | There is still no unified theory that proves the asymptotic efficiency of maximum likelihood estimator. A classical proof, an example of which is Cramer`s, holds only under the so-called regularity condition. Other conditions have been proposed and are presented here, notably that one byDaniels for non-regular case and by Wolfowitz, which more or less a generalization of Cramer`s, since he assumes also the same regularity conditions although of a broader scope and an additional condition on competing estimator called, the Uniformity Condition. One new concept that will perhaps lead to a unified proof for the aymptotic efficiency of maximum likelihood estimator without even modifying the same is the concept of "fuzzy sets". Here we consider the "parameter space" generated by the maximum likelihood estimator, as n is varried, as fuzzy and show that finding asymptotic efficiency is equivalent to finding an element of the set whose value of its mempership function is a maximum. |
| Nama Pengarang | : | Hendra Santosa Kurnia |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-11 |
| Abstraksi Narasi | : | The use of diode lasers as light sources for optics related experiments and products has been increased very fast during the last decade. The switching from analog signal processing into the new remarkable digital processing in audio and video entertainment products owes a great deal to the development and research on diode laser. This article presents a short review on basic theory and characteristics of diode lasers, as well as ideas to improve its beam quality and how to build its current driver to start a new challenging experiment on the diode. |
| Nama Pengarang | : | B. Djoko Untoro Suwarno |
| Nama Majalah/Jurnal | : | Sigma Jurnal Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 75-82 |
| Abstraksi Narasi | : | In teaching computer hardware, students could be expected to understand better if they could see by themselves how a peripheral works. In this paper, we describe the disc drive demonstration board which can be used as a medium in computer teaching. This demonstration apparatus controls a disc drive manually. The controlled variables include "select drive", "motor enable", "direction of head moving", "head displacement", and "speed of head moving". It also monitors "track 0", "write protect", and "position of head". |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Linguistik Indonesia |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 269-286 |
| Abstraksi Narasi | : | Scrutinizing the cultural traits found in an ethnic group such as the Javanese, we will find that many of these traits, which are reflected in idiomatic expressions, are presumably also found in other ethnic groups throughout the country. In our attempt to define a national culture, it would be interesting to investigate these traits to find both similarities and dissimilarities. Those which are similar can be proposed as potentitally good candidates for our national culture. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Linguistik Indonesia |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 167-186 |
| Abstraksi Narasi | : | Salah satu aspek budaya yang secara intrinsik paling melekat ke dalam sistem sebuah bahasa dan yang dengan segera dapat menunjukkan budaya penuturnya dapat ditemukan pada gaya bertutur para penuturnya. Sangat disayangkan bahwa minat para pemerhati bahasa Indonesia (BI) untuk mengkaji realisasi pertuturan dalam masyarakat penutur BI masih sangat rendah, padahal, di lain pihak, mereka menyadari betul bahwa masalah pertuturan ini merupakan hal yang teramat penting yang akan ikut menentukan keberhasilan komunikasi bersemuka khususnya. Terkecuali dalam realisasi pertuturan seperti memaki, mengumpat, mencela, bersumpah, dan yang sejenisnya, dalam komunikasi bersemuka yang `wajar`, baik penutur maupun mitra tutur, biasanya ingin berusaha menampilkan kesan yang terbaik pada mitra tuturnya, sehingga keharmonisan hubungan di antara mereka akan tetap terjaga dan ini adalah hakikat dari realisasi kesantunan berbahasa. Melalui serangkaian penelitian tentang realisasi pertuturan meminta (requesting), menolak (refusing), dan memohon maaf (apologising) oleh masyarakat penutur BI ditemukan bahwa prinsip pokok realisasi kesantunan berbahasa para penutur BI adalah Saling Tenggang Rasa yang di dalamnya terkandung sejumlah nilai dan sub-prinsip yang satu sama lain saling terikat. Makalah ini akan menyajikan pokok-pokok pikiran tentang prinsip kesantunan berbahasa masyarakat Indonesia tersebut serta membandingkannya dengan teori kesantunan berbahasa yang sudah ada selama ini, baik dari Goffman (1967), Grice (1975), Brown & Levinson (1978; 1987), maupun dari Leech (1983). |
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