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This paper describes a design of CMOS infrared(IR) wireless data link IC. This module consists of a 60 dB fixed gain transimpedance amplifier, AGC(automatic gain control) citcuits, AOC(automatic offset control) loop, 4PPM(pulse position modulation) rnodulator/demodulator and DLL(delay locked loops). Using a commercial 0.65 um CMOS process, the module consumes 32 mW at 100 Mb/s with 3 V excluding buffer amplifier. And achieves variable gain of from 60 dB to 100dB, and also provides both 4Mb/s and 100 Mb/s IrDA(Infrared Data Association) operation
This paper describes a design of Electrical Circuits for Body Composition Analyser system. This system consists of CPU, LPF for signal Source and BPF for measured Body Siganl, RMS(Root Mean Square) detector and Analog to Digital converter. For multifrequency operation(20 KHz and 100 KHz), dulal mode circuits are included in this design. The system has less than 0.3% remeasuring accuracy error with internal calibration system.
Consider a production network in which a product is manufactured by multiple firms located in this network before it is finally delivered to outside customers. In this paper we analyze and present four types of production networks: strategic network, operational network, regional network, and virtual enterprise. Also this paper discusses the conditions of the production networks.
N-Alkylthebaine derivatives were synthesized by using northebaine. Northebiane was synthesized by the treatment of DAD to thebaine in acetonitrile. N-substituted thebaine derivatives were then obtained by alkylation of northebaine with alkyl halide and potassium carbonate in dimethylformamide solution. Intermediates of new thebaine derivatives were obtained through Hetero Diels-Alder reaction. In the Hetero Diels-Alder reaction, trifluoroacetaldehyde and N-alkylthebaine were used as a dienophile and a diene respectively. The new thebaine derivatives, also called as jndolornorphinan derivatives, were obtained through hydrolysis, reduction and then Fisher indole synthesis of the intermediates. Fisher indole synthesis of Cl4-substituted thebaine derivatives provides new jndolomorphinan derivatives. These new jndolomorphinan derivatives are potential canidates as acting pain killer.
This paper describes a design of Mixed Signal IC Circuits for FM(Frequency Modulation) Transmitter system. This aystem consists of Multiplex Block, Low Frequency Voltage Controlled Oscillator(LFVCO), Phase Locked Loop(PLL), Mixers and Digital Circuits. For the implementation of Inductorless LC oscillator, gyrator circuit with two OTA(operational trans-conductance amplifier) is used. The Circuit is implemented with 0.25um CMOS technology and has a size of 770 urn X 840 um including digital logic. Power consumption of 28 mW with 2.SV is estimated.
In multilevel secure database management systems, owing to the disallowance of write-down and read-up, the disclosure of Information classified at high security level could be prevented. Conventional multilevel secure database management systems, however, attempted to close covert channels between transactions of different security levels in a way of multiversion-based concurrency control schemes. Multiversion-based schemes, unfortunately, forced transactions to read excessively old versions and suffered the burdens of maintaining multiple versions. By use of restricted number of role-based versions, in this paper, we propose a new covert channel elimination scheme that is capable of increasing the degree of fairness among transactions cleared at different security levels.
The mobile telecommunications services by Korea Telecom made its commercial debut to Korean market in May 1984, which name was changed to SK Telecom. Shinsegi Telecom, new service provider, began to provide the mobile telecommunication by CDMA technologies in April 1996, for the first time in the world. In October 1997, the three companies, Korea Telecom Freetel, LG Telecom, Hansel PCS, were introduced to provide new mobile telecommunications, Personal Communication Systems, based on CDMA technologies. Now we have five service providers in the mobile telecommunications. Our paper investigate the maximum penetration rate of the mobile telecommunications.
The trend of thought on Korean poetry are divided into 3 periods-the first stage (introductory period), the period of formation (the period of absorption and digestion) and the period of development; the condition and the transitional course are discussed chronologically. Then Ⅰ referred to the position and features of modern poetry. In particular, nature and direction of modern poetry are discussed with concreteness and at the same time, Ⅰ suggested a new method for a new structure of modern poetry. In this connection, Image and Metaphor, two important elements in modern poetry are examined. Lastly, Ⅰ tried to discuss as concretely as Ⅰ could the new structure of poetic drama and the elements which determine modern poetic drama.
This paper presents a design of the PCI image grabber for the progressive camera. The grabber can transmit the captured image data directly to main memory or VGA video memory by master fly-by DMA. Several grabber can be installed together in PC without capture failure derived from the bus conflicts. The grabber is expected to be used for visual inspection, and sorting process for automation of factories.