• YAKHAK HOEJI
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• v.59 no.2
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• pp.77-84
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• 2015

The spring convention of the Pharmaceutical Society of Korea (PSK), composed of eight symposia and two special symposia, was held at the K Seoul Hotel on April 17th and 18th in 2014. During the convention, the board meeting of PSK officially approved the birth of Pharmacy History (PH) Division as one of 19 divisions of PSK on April 17th. In the morning of April 18th, an inaugural symposium of PH division was held at the hotel with a theme of "History of Pharmacy in Korea". In this article, the establishment of PH division, content of the 1st symposium will be described. The future vision of PH division, which will be focused on the study of modern history rather than that of old history, will be described as well. The introduction of modern pharmacy education system to Korea and various events that happened during the establishment of the system may represent issues that should be investigated with the highest priority by the PH division.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.11
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• pp.2147-2159
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• 1994

In this parper, the performance of trellis coded DS/SSMA system using feedforward trellis encoder with sasymmetric signal constellation are evaluated over AW(In channel. The numerical results of trellis coded 4 PSK(code rate 1/2)and 8-PSK(code rate2/3) are calculated for 2-state and 4-state cases and compared with those of the Boudreau's system using feedback trellis encoder without optimizing the signal constellation. The method of moments is employed to evaluate the multiple access interference, in conjunction with the generalized transfer function techniques for trellis code. The numerical results show that the proposed system in this paper is always better than the Boudreau's system over AWGN channel; particularly at $P_b:10$, $0.2dB\sim2.4dB$ improvement over AWGN channel are obtained.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2000.05a
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• pp.292-296
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• 2000

뇌손상에 기인하는 한글 난독증의 어휘처리 양상을 분석하여 한글정보처리의 특성을 알아보고자 하였다. 피험자 PSK의 한글 어휘처리에서 특히 주목되는 점은 단어의 음독은 가능하나, 비단어의 음독은 불가능하였다는 것이다. PSK의 한글 어휘처리는, 자소-음소변환(grapheme-phoneme conversion)경로가 선택적으로 손상되어, 심성어휘집(mental lexicon)의 발음정보를 이용하는 직접경로에 의해서 이루어진다고 판단된다. 읽기(reading)와 그림명명(picture naming)에서 나타난 오류들에 대하여, 음운적 단서(phonological cueing)를 제시하였다. 그 결과, 읽기 수행에서는 단서 주기 효과가 나타나지 않았으나 그림명명에서는 수행상의 향상이 나타났다. 또한, 1음절어의 읽기 수행에서는 규칙효과가 나타나지 않았으나 2음절어의 읽기 수행에서는 빈도와 규칙성의 상호작용이 나타났다. 이것은, PSK의 1음절어와 2음절어에 대한 읽기 수행이 상이한 경로에서 이루어질 가능성을 시사한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.8A
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• pp.752-759
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• 2010

The low power consumption is the most important design factor for the In-Body communication system of WBAN. The conventional PSSK (Phase-Silence-Shift-keying) modulation technique can be regarded as an extension from PSK modulation. And this PSSK has better power efficiency than PSK modulation, and higher spectral efficiency than FSK modulation. PSSK modulation is to transmit two orthogonal symbols. The transmission power can be lowered because the symbol rate in signal period becomes half. BER performance is improved because transmission power is lower and the modulation symbol distance is widened. In addition, PSSK preserve the low-power and increase the data rate than FSK. In this paper, we analyzed existing PSSK and like to propose a new PSPM (Phase-Shift-Position-Modulation) modulation scheme. This PSPM is evaluated in terms of considered bandwidth efficiency and BER performance, compared with the PSSK. This PSPM modulation method transmits the information data by both PSK symbol data and symbol position data, so that we can significantly improve the power efficiency. New proposed PSPM method could be very useful for the In-body communication that requires the most power efficient system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.8 no.2
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• pp.63-75
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• 1983

This paper has investigated and discussed the effects of multiple PSK signals upon an wideband FM signal in an intersystem interference environment between analog and digital radios. Using the derived approximate equation for the output haseband interference noise, the signal-to-interference noise power ratio(SNR) in the top channel baseband signal has been numerically calculated. The results are plotted in graphs as the functions of carrier-to-noise ratio(CNR), carrier-to interfer power ratio(CIR), and normalized carrier separation. From the results in this paper, one can know some optimu, or suitable, operating conditions(frequency allocation, bandwidth, and power, etc.) for an FM channel in the intersystemn interferences from digital PSK channels.

• Journal of Advanced Navigation Technology
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• v.13 no.3
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• pp.337-343
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• 2009

In this paper, we proposed a burst mode symbol timing recovery unit that is applicable to the VDL Mode-2 using D8PSK modulation. A method that IIR loop filter is used to minimize symbol timing error is hard to apply to burst mode because its convergence time is long. That is, the fast convergence property is important. In this paper, the proposed method takes one sample which has maximum symbol power after the initial synchronization has been achieved by using preambles. The main principle of operation is that the unit moves one sample clock to advance or retard according to symbol power. We verify that the proposed method is operated well in ${\pm}100$ ppm or greater through the test results between Australia ADS Corp. transmitter and the designed receiver.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.251-256
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• 2001

In this study, a OFDM mode, unlike traditional single carrier mode, is that a great number of carrier in multi-channel environment is transmitted by modulating objective Data parallel in order to execute high speed Data translation and make frequency orthogonal to offer high spectrum efficiency As a result, this method is adopted to a variety of fields and is being actively studied. In this papers, the efficiency of OFDM wireless-communication systems is evaluated by modulation methods through computer simulation. M-PSK and M-QAM are used as modulation methods. The simulation is executed in a real channel and a virtual channel included multi-path, AWGN, Peak Power clipping, Frame Start Time Error. As a result of simulation, it is confirmed that M-OAM method is superior to M-PSK in OFDM systems in terms of the transmission methods.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.3B
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• pp.196-201
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• 2002

OFDM(orthogonal Frequency Division Multiplex) modulates transmitting data with many carriers in parallel. As a result, high-speed data transmission is carried out and high spectral efficiency is provided by overlapping orthogonal frequencies. Therefore, OFDM is applied to many communication systems. In this paper, according to modulation methods(M-PSK and M-QAM), coded-OFDM wireless communication is simulated. Turbo code is used and two channels(virtual and real channel) are used. both channels have multipath delay spread, Gaussian noise, and peak power clipping. As a result of the simulation, coding gain is about 3dB and it is proved that M-QAM modulation is better than M-PSK. Start after striking space key 2 times.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.5A
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• pp.484-492
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• 2006

A multi-code biorthogonal code keying(MBCK) system consists of multiple waveform coding block, and the sum of output codewords is transmitted. Drawback of MBCK is that it requires amplifier with high linearity because its output symbol is multi-level. MBCK with constant amplitude preceding blcok(CA-MBCK) has been proposed, which guarantees sum of orthogonal codes to have constant amplitude. Redundant bits of CA-MBCK for constant amplitude coding are not only used to make constant amplitude signal but also used to improve the bit error rate(BER) performance at receiver. In this paper, we proposed a transmission scheme which combine CA-MBCK with $Q^{2}PSK$ to improve bandwidth efficiency of CA-MBCK. The BER performance of the scheme is same that of CA-MBCK in additive white gaussian noise(AWGN). And we showed that BER performance of the proposed system can be improved using redundant bits of constant amplitude preceding.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7C
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• pp.678-687
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• 2003

8SQAM(8-state Superposed Quadrature Amplitude Modulation) being a new modem technique for use in power and bandwidth limited digital communication system generates output signals which have a mか and continuous phase transition and a reduced envelope fluctuation by keeping correlation between amplitudes and phases of two subsequent symbols. Also, 8SQAM signal is free of inter-symbol interference(ISI), and has a compact power spectrum. Accordingly 8SQAM, as compared with a conventional 8PSK, is influenced a little by inter-modulation(IM), inter-symbol interference(ISI) and adjacent channel interference(ACI) in a nonlinearly amplified multi-channel(SCPC-FDMA) environment. In this paper, the performance of 8SQAM system in a nonlinearly amplified multi-channel interference environment is analyzed via computer simulation The simulation result shows that 8SQAM outperforms 8PSK with roll-off value of $\alpha$ = 0.3 by 2.7dB in CNR to maintain BER=1$\times$10$^{-4}$ when input back-off(IBO) of HPA is 1dB and channel space is 41.7% of the data bit rate(i.e., spectral efficiency = 2.40b/s/Hz).