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Myungsu Park(박명수),Yunhee Ku(구윤희),Sehyun Shin(신세현),Jangsu Suh(서장수) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The light-transmission technique has been applied to a slit rheometer for measuring red blood cell aggregation as well as blood viscosity over a range of shear rates. For measurement of blood viscosity and aggregation, instantaneous pressure and transmit-light intensity are measured with time. Using a precision pressure measurement, one can determine the shear stress and shear rate. In addition, a transmitted light through a blood sample indicates degree of RBC aggregation. With abruptly flowing with high shear rate, RBCs rapidly disaggregate and the intensity of the transmitted light becomes low. When continuously flowing with decreasing shear rate, RBCs tend to re-aggregate and the corresponding transmit-intensity gradually increases with time. The light intensity as a degree of RBC aggregation is plotted against shear rate and compared with blood viscosity. The advantages of this design are dual measurement at a time, simplicity, i.e., ease of operation and no moving parts, low cost, short operating time, and the disposable kit which is contacted with blood sample.
Myungsu Kim,Seung Seob Bae,Mijin Seol,Jung-Hyun Lee,오영숙 한국미생물학회 2008 The journal of microbiology Vol.46 No.6
Marine harbor sediments are frequently polluted with significant amount of polycyclic aromatic hydrocarbons (PAHs) some of which are naturally toxic, recalcitrant, mutagenic, and carcinogenic. To stimulate biodegradation of PAHs in PAH-contaminated sediments collected from near Gwangyang Bay, Korea, lactate was chosen as a supplementary carbonaceous substrate. Sediment packed into 600 ml air-tight jar was either under no treatment condition or lactate amended condition (1%, w/v). Microbial community composition was monitored by bacteria-specific and archaea-specific PCR-terminal restriction fragment length polymorphism (T-RFLP), in addition to measuring the residual PAH concentration. Results showed that lactate amendment enhanced biodegradation rate of PAHs in the sediment by 4 to 8 times, and caused a significant shift in archaebacterial community in terms of structure and diversity with time. Phylogenetic analysis of 23 archaeal clones with distinctive RFLP patterns among 288 archaeal clones indicated that majority of the archaeal members were closest to unculturable environmental rDNA clones from hydrocarbon-contaminated and/or methanogenesis-bearing sediments. Lactate amendment led to the enrichment of some clones that were most closely related to PAH-degrading Methanosarcina species. These results suggest a possible contribution of methanogenic community to PAH degradation and give us more insights on how to effectively remediate PAH-contaminated sediments.
홍명수(Myungsu Hong) 서강대학교 법학연구소 2009 서강법학 Vol.11 No.2
Telecommunications Law in Korea will purpose to be operated telecommunications industry healthily and increase public interest, and must pursue activation of market function and realization of public interest to achieve such purposes. The User's interest that Telecommunications Law will protect must be understood on the basis of these diverse policy objects. And in addition the concept of user must be based on such an understanding. But because the user's concept that Telecommunications Law defines on article 2 adopts the premise of the contract about the use of telecommunications services, such a definition would not reflect the comprehensive interests of the user of telecommunications services. So it is necessary to amend the definition of the user in Telecommunications Law to include the user outside of telecommunications use contracts as the user's definition in EC Telecommunications Framework Directive, in which user means legal entity or natural person using or requesting a publicly available electronic communications service. In general the user of telecommunications services contains the meaning of consumer using these services for daily life. Because the consumer has an inferior position in contrast with the provider of telecommunications services, special protection of the consumer must be realized in Telecommunications Law. But the existing Telecommunications Law in Korea defines only user's concept and would not have the definition of consumer. So the concept of the consumer must be introduced in Telecommunications Law, as EC Telecommunications Framework Directive, which defines consumer as any natural person who uses or requests a publicly available electronic communications service for purposes which are outside his or her trade, business or profession.