• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.2157-2168
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• 2013

This study is about facilities using pattern for 'River-eco-park' that is Hwa-myeong Eco-park, Sam-rak Eco-park, Maek-do Eco-park. Through doing surveys, most patterns could be divided 5 patterns; 'Eco observation facility pattern', 'Promenade pattern', 'Bike path pattern', 'Sports facility pattern', 'Fitness center pattern'. Then we find channel of movement of user patterns by follow-up surveys. On the basis of this surveys, we are going to suggest some directions for River-eco-park design.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.7
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• pp.1777-1791
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• 2012

This paper considers a downlink cognitive radio (CR) network where one secondary user (SU) and one primary user (PU) share the same base station (BS). The spectrum of interest is divided into a set of independent, orthogonal subchannels. The communication of the PU is of high priority and the quality of service (QoS) is guaranteed by the minimum rate constraint. On the other hand, the communication of the SU is of low priority and the SU opportunistically accesses the subchannels that were previously discarded by the PU during power allocation. The BS assigns fractions ?? and 1 ?? of the total available transmit power to the PU and the SU respectively. Two power allocation schemes with opportunistic subchannel access are proposed, in which the optimal values of ??'s are also obtained. The objective of one scheme is to maximize the rate of the SU, and the objective of the other scheme is to maximize the sum rate of the SU and the PU, both under the PU minimum rate constraint and the total transmit power constraint. Extensive simulation results are obtained to verify the effectiveness of the proposed schemes.

• 한국해양학회지
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• v.22 no.4
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• pp.217-227
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• 1987

The heat budget of the south eastern region (33$^{\circ}$N-36$^{\circ}$N, 120$^{\circ}$E-125$^{\circ}$E) of the Yellow Sea was calculated by using the meteorological and oceanographical data. The sensibly heat, the evaporation heat and the long wave back radiation have annual variation and increases toward south with strong gradient along the Cheju channel in winter, but they all show tendency to decrease toward eastern coastal area in summer. The area is roughly divided into three parts, the central part, the coastal part and the southern part, according to the characteristics ovariation and distribution patterns of the exchanged heats. The amplitude of the annual variation of total heat exchange in the southern part is very large compare to those of the central and coastal part. The studied area is appeared to be heated mainly by the evaporation heat and the sensoble heat, based on the results of this study.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.69-72
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• 2007

DOCSIS 3.0 Protocol is proposed to make the advance of HFC network. In the DOCSIS based network, the upstream frame is divided into contention section reservation section. CMs to have packets send request messages through the contention section. That two or more CMs sends Request message at the same contention slot makes collison. In this paper, are propose the contention section establlish at algorithm considering of channel-bonding mechanism that is the primary technique of DOCSIS 3.0. Results of simulation display better performance int the number of contention slots and the utilization of contention section.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.2A
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• pp.103-109
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• 2006

OFDM system has a disadvantage of sensitiveness about the effect of the frequency offset caused by the discord of oscillators in transmitter and receiver. The frequency offset can be divided into integral part and decimal part. Although the frequency offset of integral part do not effect orthogonality between subcarriers, it makes the bit error probability become to 0.5 because of circular transient among transmitted data symbols. This paper proposes a new estimation scheme of the frequency offset of integral part by Maximum Likelihood (ML) demanding only one training symbol in multipath fading channel environment. This proposed scheme not only can reduce the number of training symbol but do not increase the complexity and it shows the better performance by simulation.

• Korean Journal of Child Studies
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• v.36 no.6
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• pp.85-100
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• 2015

This study divided elementary school 6th graders of into a higher academic achievement group (n=19) and a lower academic achievement group (n=19) in order to examine the tendency of left and right hemisphere preferences, characteristics and relationships of learning ability factors by means of EEG. For this purpose, brain waves in performing higher cognitive tasks for 5 min. were measured with a two-channel (Fp1, Fp2) EEG measurement system and hemisphere preference was measured by means of a questionnaire. Our results were as follows. First, hemisphere preference indicated that the higher group showed a left hemisphere tendency and the lower group indicated a right hemisphere tendency. Second, the first learning ability test found that the higher group performed its task rapidly with higher levels of concentration and cognitive strength and lower loading and the lower group conducted its task more slowly with lower levels of concentration and cognitive strength and higher loading. The second test showed that the higher group performed its task rapidly with lower levels of concentration.

• Journal of Acupuncture Research
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• v.18 no.1
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• pp.226-236
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• 2001

Objects : To evaluate clinical efficiency of The A-Shi point for the herniated lumbar intervertebral disc. Methods : The patients who had a diagnosis of herniated lumbar intervertebral disc by lumber CT and MRI, and were observed from the twentieth March 2000 to the tenth Novemsber 2000, were divided into two classes ; the "A" group was 15 cases practiced with Acupuncture treatment used of A-Shi point and the twelve-Meridian, the "B"group 15cases only Acupuncture treatment used of twelve-Meridian, Results : the most type of low back pain was, the Gall bladder channel of Foot-souyang 15 cases (50%) and the Gall-Bladder Meridian Muscle was 45 cases the most in the existence part of A-Shi point On the result of treatment due to clinical symptoms, the "A" group was 57.9% as excellent and "B" group 19.8%. On the measurement of Lumber flexion, the "A" group proceed more excellent result than the "B group at the whole grade. Conclusion : These results suggest that The A-shi point was effective treatment of herniated intervertebral disc.

• The Korea Journal of Herbology
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• v.27 no.2
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• pp.47-51
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• 2012

Objectives : The purpose of this study was to investigate the reproductive effect of Ginseng radix on male mice. Methods : Male C57BL/6J mice were divided into four groups ; normal group (vehicle-treated, n=8), Ginseng radix treatment group (100, 500, 1000 mg/kg, n=8). Ginseng radix extract was treated for 5 weeks. After treatment each group was examined for assessment of sperm count and CatSper protein expression using computer assisted semen analysis (CASA) system and the immunofluorescence. Results : Sperm count of normal and Ginseng radix extract treated group were 287.57 vs. 371.62, 364.83, $343.29{\times}10^6$, respectively. The CatSper3, 4 proteins expression of Ginseng radix treated group were significantly increased than that of normal group. Conclusions : These findings suggest that the Ginseng radix improves male reproductive function by increasing sperm count and CatSper protein expression.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.11a
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• pp.416-417
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• 2008

This paper performed the basic study for developing the Photodynamic Therapy Equipment for medical treatment. We developed the 4channel light medical therapy apparatus for external injury cure using a LED light source. This equipment was fabricated by using microcontroller, and designed to enable us to control light irradiation timer, intensity and reservation. In this paper, the designed device was used to find out how 470nm LEDs light source affects the skin wound of RAT. In the experiment, $1cm_2$ wounds on the External injury of RAT were made. Light irradiation RAT and none light irradiation RAT divided, each RAT was irradiated one hour a day for 15 days. In result, compared with none light irradiation RAT, the lower incidence of inflammation and faster recovery was shown in light irradiation RAT.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.12 s.91
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• pp.1199-1206
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• 2004

In this paper, we analyzed the orthogonal MC DS-CDMA system and no-overlapping MC DS-CDMA System, which were divided by the normalized spacing between adjacent subcarrier over Nakagami-m fading channels. In order to reduce the number of selective paths occurring in the MC system, the Hybrid SCMRC technique was applied, which was compared with the case when the MRC technique was used. As a result of simulations, it was found that the Hybrid SC/MRC method could be replaced by the MRC method and if the number of subcarriers was increased when the given bandwidth was fixed, the interval between subcarriers increased and bigger bandwidths were required. an, the number or subcarriers should be selected in consideration or given bandwidth.