• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.5
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• pp.817-826
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• 2001

In this paper, we implemented QPSK(Quadrature Phase-Shift Keying) modem which is widely used for communication systems, using a general Digital Signal Processor(DSP), TM320C31. Up to now, almost all of communication systems consist of hardware. However, the implemented system herein is composed of software and hardware part. Software part includes the modulation process, before passing D/A(Digital-to-Analog Converter) and the demodulation process, after passing A/D(Analog-to-Digital Converter) in IF(Intermediate Frequency) node. Hardware part is related to input, output and process of signal. To demonstrate the successful implementation of modem, the output results obtained from DSP processor are compared with the simulated result on the personal computer.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.445-447
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• 1997

In this paper a remote monitoring and control system using Modem for UPS (Uninterruptible Power Supply) is proposed. The conventional remote monitoring system for UPS is used to local remote monitoring system by RS232 or RS485 communication code. But recently. the system is changed to wide remote monitoring and control system using Modem for quick analysis of errors, correction of errors, report of errors and other user-friendly functions. In this study, we designed and develope system which is able to control UPS an monitor errors, statuses, actual values transmitted from UPSs of each site.

• Journal of the Korean Home Economics Association
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• v.38 no.11
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• pp.137-149
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• 2000

The Purpose of this study was to investigate actual condition about the modem adaptation of interior elements(floor, wall, ceiling, door & window) in traditional thatched roof house. The examined objects were interior space of 36 restaurants and cafes in Seoul and Kyung-Ki Do area. 1. Floor: Jang-pan was mostly alternated with linoleum which huts Jang-pan pattem. Wumul-maru was adapted from the original and Jang-maru was alternated with wood or linolium which has western state Jang-maru pattern. Mud was adapted from the original or alternated with slate stone or rough finish cement. 2. Wall: Rice proper was alternated with rice paper book witch has chinese character, paper for parcels or modem wall paper. Plaster-white paint or white handy coat. Mud-mud color paint or bamboo stick witch located in the mud wall orginal. Log-half cut log. Wooden board-without cross bar or irregular form. 3. Ceiling: Yondung-Chongang was mostly adapted from the original and Banja-Chonjang was alternated with rice paper book which has Chinese character or modem wall paper. 4. Door and Window: Ttisal-mun and Panjang-mun were adapted from the original. Wan and A’character door and window were simplified character itself.

• Korean Journal of Human Ecology
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• v.13 no.1
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• pp.159-171
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• 2004

The purpose of this study was to compare the characteristic of Chanel style between modern and postmodern period. The documentary research method was used for this study. The modem period was limited from around 1920 through 1939 and the postmodern period from 1990 through present for this research. The results were summarized as follows: The characteristics of clothing style in modem period were 1) the preference of slim & straight body figure as ideal one and slim & straight clothing silhouette, 2) the high fashion image for the elite by simple & basic design, 3) the emphasis on the harmony by the unity, 4) the tendency of eliminating ornaments on clothing, 5) the discontinuation of traditional way of dress code & style, and 6) the modern style. The characteristics of clothing style in postmodern period were 1) the emphasis on erotic aspects of female body and sexy design, 2) the popularization of high fashion and certain social group's fashion, 3) the tendency of harmony by mix-match, 4) the preference of ornaments in clothing, 5) the preference of retro-fashion, and 6) the continuation of modem style.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.90-94
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• 2003

For the structure of VMS is required to the maritime MDT for realtime acquisition the position reporting of navigating ships. The first study is the recording method a navigating data by GPS, the 2th is SSB modem for data trans-receiver by use ship. And then the communication protocol of automatic traffic for in continues transmission a ship's ID, time and position data of GPS. In this paper have studied the SSB modem for transmission the voice and data at same time. Which is adapted to the communication control unit, protocol of data traffic and acquisition, displayer of character data. This maritime GPS MDT is considered to low-cost type by using microprocessor.

• Journal of the Korean Society of Fashion and Beauty
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• v.5 no.2 s.13
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• pp.12-22
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• 2007

Even though Up style field generally rise economic development and GNP, many demand got to cultural development and direct ratio. When you up style is main study of concrete study purpose which end of hair. Variation is upper spread, down spread, middle spread, symetric form, asymetric from etc. As a result is followed; 1. According to chignon's position, fusion style reproduced korea modem through various data and categorize style. 2. Modem korea fusion style reproduced theme up style(wedding, evening, causal, han-bok, fusion show). 3. The thesis compared and analyzed modem korea fusion up style and japanese fusion up style. (1) According to chignon's position and balance, up style compared and analyzed it. (2) Theme up style(wedding, evening, causal, han-bok, fusion show) compared and analyzed categorize. End of hair classified variation according to position and balance external image affected to it which bale on design component as a result, classified up-style reconstruct.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.9A
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• pp.2141-2152
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• 1998

In this paper, we design and implement an indoor wireless modem using small signal of ISM band regulation, which can tranceive reliable data streams. We use direct sequence spead spectrum (DS-SS) signaling with synchronous BPSK and QPSK modulation, convolutional coding with viterbi decoding. The radio frequency module uses frequency devision duplexing in 900 MHz band, and the digital module is implemented with FPGAs for the purpose fo ASIC design. The perfomrance of our own acquistion and tracking circuit consisting digital matched filter and decision logic is proved by experiments, and the possibility of file transfer at indoor environment with the entrie system that the modem is connected the PC through RS-232C port is verified.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1940-1943
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• 2002

In this paper, we presented the design and implementation of 155Mbps satellite Modem adaptively compensated against the rain attenuation. In order to compensate the rain attenuation over high-speed satellite ink, the adaptive coding schemes with variable coding rates and the pragmatic TCM that can be decoded both the QPSK and TC-8PSK using same Viterbi decoder was studied and analyzed. The pragmatic TCM with rate 213, selected to the optimal parameters for implementation, was modeled by VHDL in this paper. The key design issues are how to achieve a high data rate and how to integrated into a single ASIC chip various functions such as the different data rates, Scrambler/descrambler, Interleaver, Encoder/decoder, and BPSK/QPSK/8PSK modulator/demodulator. The implemented 155M0ps adaptive MODEM has the simplified interface circuits among the many functional blocks, and parallel processing architecture to achieve the high data rate. This 155Mbps adaptive MODEM was designed and implemented by single ASIC chip with the 0.25 $\mu\textrm{m}$ CMOS standard cell technology.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.2
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• pp.6-12
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• 2008

In uplink cable modem link operated in time-division multiple access mode, it is crucial to employ a suitable preamble pattern enabling frame detection, coarse timing/carrier recovery. Preamble pattern based on the constant envelope zero autocorrelation sequence is proposed for the uplink cable modem compliant to the data over cable service interface specification. Frame detection, coarse/fine timing and carrier recovery algorithms suitable for the proposed preamble pattern are also proposed. We check up the performances using numerical results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.307-310
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• 2001

In this paper we describe the design and implementation of uplink receiver for BWLL base station modem. The demodulator consists of digital down converter, matched filter and synchronization circuits. For symbol timing recovery we use Gardner algorithm. And we use forth power method and decision directed method for carrier frequency recovery and phase recovery, respectively. For the sake of performance analysis, we compare simulation results with the board implemented by FPGA which is APEX20KE series chip for Alter. The performance results show it works quite well up to the condition that a frequency offset equal to 4.7% of symbol rate.1