Indonesian telecommunications development: An overview

Indonesian Telecommunications Development is a part of the “National Development,” which carried out, through a series of “Five Year Development Plans” (FYDP), its efforts towards raising the standard of living and well-being of the people. In its development perspective, Indonesia has been pursuing the “Trilogy of Development” which reflects the notion of even development, a sufficiently high rate of economic growth and the dynamic as well as healthy national stability.     

Determination of residual tetrachloroethylene in olive oil by headspace-gas chromatography

Summary This study describes a method for the quantitative determination of residual tetrachloroethylene or perchloroethylene (PCE) in olive oil by headspace-gas chromatography. The analysis of the chlorinated product is performed by electron-capture gas chromatography, using a fused silica capillary column, CP Sil 8 CB. The absolute detection limit for PCE was 1 pg. Forty samples of olive oil and 5 other commodities have been analysed. Only one sample exceeded the proposed maximum level of 1 mg/kg.

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Bestimmung von Restmengen von Tetrachlorethylen in Olivenöl mittels Kopfraum-Gaschromatographie

Zusammenfassung Es wurde eine Methode für die quantitative Bestimmung von Restmengen des Tetrachlorethylens oder Perchlorethylens (PCE) in Olivenöl beschrieben. Das chlorierte Produkt wurde durch Kopfraum-Elektroneneinfang-Gaschromatographie unter Verwendung einer CP Sil8 CB-Silica Capillarkolonne bestimmt. Die absolute Nachweisgrenze mittels Kopfraumtechnik für PCE war 1 pg. Insgesamt wurden 40 Olivenöl- und 5 andere Proben analysiert. Nur 1 Probe überschritt die vorgeschlagene Maximalgrenze von 1 mg/kg.

     

Einfluß von Elektrodenwerkstoff und Spannungsarmglühtemperatur auf die Schweißeigenspannungen in hochfestem,vergütetem Feinkornstahl

Untersuchung des Einflusses von Elektrodenwerkstoff und Spannungsarmglühtemperatur auf die Schweißeigenspannungen in Stahl StE 70. Bestimmung von Eigenspannungen und Härte im Schweißnahtbereich. Erläuterung des Zusammenwirkens von Wärme- und Umwandlungsspannungen.     

Neuroticism and extraversion in Turner's Syndrome.

Administered the Maudsley Personality Inventory to 5 groups of female Ss: (a) 13 Turner Syndrome Ss (mean age 19 yrs 2 mo) with karyotype 45X, (b) 18 Turner Syndrome (TS) Ss (mean age 26 yrs 11 mo) with other types of sex chromosomal abnormalities, (c) 16 sisters of Ss (mean age 24 yrs 2 mo), (d) 9 Ss with growth retardation and primary amenorrhea (mean age 22 yrs 4 mo), and (e) 19 nurses (mean age 22 yrs 8 mo). The results are compared to English and American normative values. The total group of TS Ss obtained a low Neuroticism (N) score compared to the control groups. When the total group was divided on the basis of their karyotypes, the low N score could be referred solely to Ss with karyotype 45X, who scored significantly lower than any other group tested so far with the MPI. TS Ss with chromosomal abnormalities other than 45X scored within normal limits. No variables other than karyotype 45X were related to an extremely low N score. It is concluded that exceptional emotional stability, as reflected in a very low N score on the MPI, is concomitant with the total absence of one sex chromosome, which is probably due to a developmental abnormality of the CNS. (7 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The influence of exposure to different levels of cadmium on the secretion and biological halflife of corticosterone in the rat

The adrenal cortex is one of various tissues where elevated concentrations of cadmium have been found. To determine whether this accumulation would lead to an alteration in the function of the adrenal cortex, corticosterone secretion and its turnover in the blood pool were studied in the rat at various levels of cadmium exposure.Weanling male rats received cadmium with drinking water. Within eight weeks of exposure to cadmium concentrations of 30, 150 and 300 mg/l in the drinking water the biological half-life of corticosterone in blood had decreased. It is not known whether this was due to an increase in degradation of the hormone or an increase in excretion. At exposures up to 150 mg cadmium/l this loss of hormone from the blood was sufficiently compensated, or even over-compensated for by an increased rate of corticosterone secretion by the adrenals. At an exposure of 300 mg cadmium/l, however, the secretion rate had decreased below that of the controls, thus leading to a decrease in the corticosterone level in blood.The lack of ability to compensate for the loss of the hormone from blood signals functional insufficiency of the adrenal cortex. This occurred at a concentration of 5.6 μg Cd/g fresh adrenal tissue, which is approximately 5 times the cadmium concentration reported for the adrenals of “unexposed” humans.Whether the secretory inhibition originates in the adrenal cortex itself or in its regulating system could not be conclusively demonstrated by this experiment.     

A Faster and More Space-Efficient Algorithm for Inferring Arc-Annotations of RNA Sequences through Alignment

The nested arc-annotation of a sequence is an important model used to represent structural information for RNA and protein sequences. Given two sequences S₁ and S₂ and a nested arc-annotation P₁ for S₁, this paper considers the problem of inferring the nested arc-annotation P₂ for S₂ such that (S₁, P₁) and (S₂, P₂) have the largest common substructure. The problem has a direct application in predicting the secondary structure of an RNA sequence given a closely related sequence with known secondary structure. The currently most efficient algorithm for this problem requires O(nm³) time and O(nm²) space where n is the length of the sequence with known arc-annotation and m is the length of the sequence whose arc-annotation is to be inferred. By using sparsification on a new recursive dynamic programming algorithm and applying a Hirschberg-like traceback technique with compression, we obtain an improved algorithm that runs in min{O(nm² + n²m),O(nm² log n), O(nm³)} time and min{O(m² + mn), O(m² log n + n)} space.     

Scheduling for stability in single-machine production systems

Robust scheduling aims at the construction of a schedule that is protected against uncertain events. A stable schedule is a robust schedule that changes only little when variations in the input parameters arise. This paper presents a model for single-machine scheduling with stability objective and a common deadline. We propose a branch-and-bound algorithm for solving an approximate formulation of the model. The algorithm is exact when exactly one job is disrupted during schedule execution.     

Breaking and Repairing Trapdoor-Free Group Signature Schemes from Asiacrypt 2004

Group signature schemes allow a member of a group to sign messages anonymously on behalf of the group. in case of later dispute, a designated group manager can revoke the anonymity and identify the originator of a signature. In Asiacrypt2004, Nguyen and Safavi-Naini proposed a group signature scheme that has a constant-sized public key and signature length, and more importantly, their group signature scheme does not require trapdoor, Their scheme is very efficient and the sizes of signatures are smaller than those of the other existing schemes. In this paper, we point out that Nguyen and Safavi-Naini＇s scheme is insecure. In particular, it is shown in our cryptanalysis of the scheme that it allows a non-member of the group to sign on behalf of the group. And the resulting signature convinces any third party that a member of the group has indeed generated such a signature, although none of the members has done so. Therefore is in case of dispute, even the group manager cannot identify who has signed the message. In the paper a new scheme that does not suffer from this problem is provided.     

Analysis of the Audible Noise of Three-Phase Squirrel-Cage Induction Motors Supplied by Inverters

One of the major problems in inverter-fed motors is the high level of audible noise produced by harmonic current and voltage components. To analyze these phenomena the field in the machine airgap is calculated using the rotating field theory together with the Maxwell stress theorem. This analysis yields a way for predicting the spectrum components produced by the motor and for relating it to the airgap flux density distribution time harmonics caused by the nonsinusoidal supply. The theoretical approach is used for calculating the airgap flux density distribution and the frequency spectrum components of a small three-phase squirrel-cage induction motor fed by a six-step voltage source inverter (VSI) and by a pulsewidth-modulated (PWM) inverter. The theoretical results are compared with experiments.