• Korean Journal of Veterinary Research
• /
• v.27 no.2
• /
• pp.317-320
• /
• 1987

An abattoir survey was carried out on 376 Korean native cattle reared and slaughtered in Soon-chun area to determine the prevalence of Fasciola hepatica infections. The average prevalence of fascioliasis was 44%; the infection rate had a tendency to increase with age. The mean(${\pm}SE$) length and width of the flukes were $24.9{\pm}2.5mm$ and $10.5{\pm}1.7mm$, respectively.

• Ocean Science Journal
• /
• v.41 no.4
• /
• pp.315-318
• /
• 2006

Three Synechococcus strains were isolated from seawater near the Ieodo Ocean Research Station (IORS), and their 16S rDNA genes and the internal transcribed spacer (ITS) between the 16S and 23S rRNA genes were sequenced to investigate their phylogenetic relationships. Phylogenetic trees based on the 16S rDNA and ITS sequences showed that they clustered in the main MC-A Synechococcus group (subcluster 5.1), but formed branches differentiating them from the described clades. As the IORS is located in an area affected by diverse water masses, high Synechococcus diversity is expected in the area. Therefore, the IORS might be a good site to study the diversity, physiology, and distribution of the Synechococcus group.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2008.11a
• /
• pp.58-60
• /
• 2008

In this paper, In this investigation we measured and evaluated effects to residential area as result of noises caused by building vibration when the turbine of hydro-electric power station runs, and establishes the best plan of soundproof for that area. Furthermore, we analyzed differences between estimated noises and actual noises and its causes before constructing the soundproofing panels so that it helps to start building the soundproofing panels and similar constructions in the future.

• Korean Journal of Hydrosciences
• /
• v.4
• /
• pp.105-116
• /
• 1993

Areal Reduction Factor(ARF) has been developed and used to convert point Rainfall intensity-Duration-Frequency(I-D-F) to areal I-D-F in many countries. In Korea, though ARF was estimated in Han river basin by several researchers, it has some limitations to apply to other regions due to low denisity of rainfall gauging station and shortage of data. In this study ARF has been developed in area of relatively high density of rainfall gauging station, i.e., Pyungchang river(Han river), Wi stream(Nakdong river), and Bochung stream(Guem river) basin by geographically fixed-area method. And coefficient of variation of mean annual precipitation was presented to use ARE in other areas and its applicability was analyzed.

• Journal of Korean Institute of Industrial Engineers
• /
• v.25 no.3
• /
• pp.321-329
• /
• 1999

An efficient location management for mobile stations plays an important role in mobile communication network. This paper studies a movement-based registration(MBR) method with a selective paging scheme. In the movement-based registration method, a mobile station performs a location registration when the number of cell boundary crossings since the last registration equals to the given movement threshold. In the selective paging scheme, the network first partitions the location area of the called mobile station into a number of subareas and then pages each subarea one after another until the MS is found. To reduce the paging and registration load, we propose a modified MBR(MMBR) method in the aspect of minimization of signaling traffic on radio channels. First, we propose a new establishment of the paging area to reduce the paging load on radio channels and then analyze its effects. Next, we propose the MMBR to reduce the registration load. Numerical results show that our proposed movement-based registration provides the better performance compared with the conventional method.

• Proceedings of the KSR Conference
• /
• 2005.05a
• /
• pp.1073-1083
• /
• 2005

Since the operation of subway line 1 between Seoul and Cheongryangri stations in 1974, the rail length and riderships have been increased during the three decades. Furthermore, it was a remarkable increase of line length between 1995 and 2004 by the operation of Lines 5, 6, 7, and 8 within Seoul metropolitan area. This study reports the variations of riderships by the changing urban spatial structure. According to analysis results by station-to-station origin-destination trip tables, there were increasing ridership changes in new stations within new subcenters, while there were little ridership changes in old stations within Seoul and existing subcenters. The levels of competition between the existing and new lines brought about the difference of ridership changes.

• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.2283-2291
• /
• 2010

This paper evaluated the effectiveness for the case of it introduced the bimodal tram for the capital area adaptability of the bimodal tram in the limelight as the new transportation means of the next generation for capital area major transportation corridor. The KTDB with 1,142 zones was utilized for the analysis and the major transportation axis around the main road in which the traffic is high. The analysis index selected around the transportation index in which it can show up by the bimodal tram application and the decrease rate of the road traffic density, the travel time change, the carbon emission quantity change, and etc. was chosen as a result. It was analyzed as the axis in which the bimodal tram adaptability effect that it is high with the section this relative including the major analyzed result west AnSan IC~ Songsan Bridge, the SuWon terminal ~ SaDang station, the UiJungBu terminal ~ DoBongSan station, and etc. can be appeared and it was predicted that the travel demand reduction on the road of about 4~6% showed up.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.15 no.6
• /
• pp.506-515
• /
• 1990

The major purpose of this thesis is suggest the simulation algorithm for performance analysis of throughput of slotted 1-persistent CSMA/CD bus protocol in Local Area Networks. The suggested simulation algorithm processes the effect of each station group that classified by the number of collision experience. Therefore, this simulation algorithm is more effective in terms of the execute than existing algorithm that processed the effect of each station. This study suggests the method for application to the busy/idle generator.

• Proceedings of the KSR Conference
• /
• 2009.05a
• /
• pp.2017-2022
• /
• 2009

Sinbundang Line(SBL) Train moves the transition zone where is located between Jeongja station and Migeum station switched over from Communication Based Train Control (CBTC) system area to Automatic Train Control (ATC) system area and viceversa. The SBL train to move the between SBL and Bundang Line is needed to install the Specific Transmission Module (STM) on SBL Line for interface with Bundang Line; STM receives from speed code from Bundang Line. So we suggested the method to ensure mutual compatibility and reliability for train operation on each other signaling system.

• Proceedings of the KSR Conference
• /
• 2004.10a
• /
• pp.1601-1606
• /
• 2004

Nowadays, the bus system of a metropolitan area is improving very fast. According to the bus, commuter railways increase their competitive power. For this, trains get the mobility increasing, effective transferring system and unified information service. For the mobility increasing, commuting railway must be faster by flexible train diagram and facilities improvement. And finally, optimal commuter train, 'Liner' is needful. And for effective transferring system, it is necessary that railway station and transferring center of a city be merged. And it is needful that direct management bus by railway company and unification fare system on metropolitan region. Next, for information service system improving, the commuting railway station must be regional transportation hub at first. And it is needful that unified line map of trunk line transportation systems and regionally collective transportation system information book. Therefore, metropolitan commuting railways compete with trunk line bus and cooperate with feeder line bus, and can make optimal metropolitan public transportation systems.