• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.421-424
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• 2011

As the demand of the high-speed transmission between fast moving mobile objects is increasing, more ideas are coming out to improve the channel distortion for such cases. WOFDM(Wavelet-based Orthogonal Frequency Division Multiplexing) is the most brilliant one among them, which combines the advantages of wavelet transform technique and OFDM technique, and it has been implemented into the PLC (Power Line communication) system. In this paper, we are trying to describe a comparative study on COFDM (Fourier-base OFDM) and WOFDM in the conventional T-DMB system. From the simulation results, we can see that the performances of COFDM and WOFDM are nearly same under the AWGN channel. However, WOFDM outperforms COFDM under the time-invariant Rayleigh fading channel.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.149-150
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• 2016

The membrane structure is being applied in structures for various uses for its many advantages as permeableness, lightweightness, constructability, resource saving, and management cost reduction, and the usage is being expanded. However, despite the development of membrane structure, the standard for architectural membrane performance that considered fire safety is still inadequate. Therefore, this study applied basalt fiber with flame resistance on architectural membrane. Also, this study confirmed the membrane applicability of basalt fiber through comparison with existing architectural membrane.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1821-1826
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• 2008

The construction of concrete slab track system is increased recently because the system has advantages which are maintenance free and so on. However, the noise level on slab track is 3 db(A) higher than the one on ballast track since most of noise is reflected on slab track. Currently, concrete slab track systems has been designed for Gyungbu high speed line stage 2 and Honam high speed line. For those tracks, noise absorbing blocks are considered. Therefore, test methods and proper criteria for structural performance and reduction efficiency of noise absorbing blocks are required. In this study, tests were performed according to established test methods and criteria in previous study and the results have done comparative analysis.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1834-1839
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• 2008

The construction of concrete slab track system is increased because the system has advantages which are maintenance free and so on, the other side, the system has weak points such as increase of the cost of the early stage construction. Recently, railway environment is issued including noise. Therefore, measures which are to mitigate noise on slab tracks were introduced, however, it is found that efficiency of noise reduction is low because noise problem is still issued. In this study, to grasp noise characteristics on slab tracks we measured noise on high speed rail slab track in addition Saemaul and Moogungwha and the results have done comparative analysis.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.77-83
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• 2009

The construction of concrete slab track system is increased because the system has advantages which are maintenance free and so on, the other side, the system has weak points such as increase of the cost of the early stage construction. Recently, railway environment is issued including noise. Therefore, measures which are to mitigate noise on slab tracks were introduced, however, it is found that efficiency of noise reduction is low because noise problem is still issued. In this study, to study noise characteristics on concrete tracks we measured noise by site types. Finally the results have done comparative analysis.

• International Journal of High-Rise Buildings
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• v.4 no.2
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• pp.109-116
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• 2015

The concept of vertical living has been hailed as a solution to control fast growth and urbanization of cities worldwide. As super tall residential projects become more common and sustainability considerations become more necessary, their efficiency has been called into question. How do vertical residential developments compare with suburban homes? What are the environmental advantages and disadvantages of vertical communities? Is there a middle ground? We present the results from an AS+GG study that compares the environmental performance of different housing typologies ranging from a 215 supertall building to single family residences, including several scales in between. Our samples comprise 2,000 residential units per type and include the infrastructure needed to support them. We analyzed land use, energy use, and lifecycle carbon emissions for each typology. The results show that different typologies perform better depending on the parameter being assessed. We discuss these findings; assess overall performance, and present conclusions.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.35
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• pp.223-247
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• 2007

This paper focused on analyzing the effect against the Chinese Economy of Korea-China FTA and the trend of China-launching FTAs. And then this paper intended to deduce policy implications against the negotiations of Korea-China FTA. The points that Korea should consider in the process of the research and negotiations of Korea-China FTA are as follows: First, it is necessary that Korea should negotiate with China only in terms of the economic sector, excluding non-economic sectors which includes politics, national securities and so on. Second, Korea should put on the lists the every possible sectors that Korea has comparative advantages in. It is essential that the sectors include services in trade, TRIPs, ect. Third, the Korean government should put investment arrangements on the negotiating lists and ask China to afford a special favor to Korean investment In China. Forth, the Korean government should set the level of its tariff, considering the nation's trade deficit that Korea-China FTA will bing about.

• Journal of the Korean Operations Research and Management Science Society
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• v.32 no.3
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• pp.81-96
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• 2007

This paper analyses the Korean information and communication technology supply side across the economy using 1995, 2000 and 2003 input-output tables. Input-output analysis considers inter-industry relations in an economy, depicting how the output of one industry goes to another industry where it serves as an input, and thereby makes one industry dependent on another both as customer of output and as supplier of Inputs. It can be evaluated that the recent growth of Korean ICT sector has come from the development of communication service and equipment industry and software industry. Although the high performance and positive revealed comparative advantages in ICT manufacturing sector, the value added and employment in that sector are not satisfactory. It may reflect in part high portion of imported intermediate goods in ICT manufacturing. However, it is fortunate that ICT services, which accounted for relatively high value added, induce the development of ICT manufacturing and follow strong export performance. Moreover, it is expected that the software sector with high value added and employment will be a major driver of ICT growth.

• Applied Biological Chemistry
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• v.28 no.2
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• pp.82-87
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• 1985

Aiming at the improvement of accuracy and sensitivity of gibberellin analysis by gas chromatography-selected ion monitoring (GC-SIM), the mass spectra of two types of 29 gibberellin derivatives, methyl ester-trimethylsilyl ethers and trimethylsilyl ester-trimethylsilyl ethers, were obtained and their advantages and disadvantages in GC-SIM analysis are discussed.

• Journal of the military operations research society of Korea
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• v.25 no.1
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• pp.107-132
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• 1999

In this study, we are concerned with the comparative aspects of five selected methods of decision making with respect to their adequacy in helping complex decisions about real-world problems. We examine the methods in terms of outlines, procedures and advantages/disadvantages to identify similarities and differences among them with the aim of showing which method is more likely to gain greater attention both in academia and in practice. To illustrate different courses of deployment of the methods, we offer an application with a case of airport transportation project in this paper. Some discussions on AHP and other methods are presented.