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Taeho Yang,이광열,한철희,안경수,장인동,안승범 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.9
For over half a century, the United States (US) and its coalition military aircrafts have been using Ultra High Frequency (UHF) band analog modulation (AM) radios in ground-to-air communication and short-range air-to-air communications. Evolving from this, since 2007, the US military and the North Atlantic Treaty Organization (NATO) adopted HAVE QUICK to be used by almost all aircrafts, because it had been revealed that intercepting and jamming of former aircraft communication signals was possible, which placed a serious threat to defense systems. The second-generation Anti-jam Tactical UHF Radio for NATO (SATURN) was developed to replace HAVE QUICK systems by 2023. The NATO Standardization Agreement (STANAG) 4372 is a classified document that defines the SATURN technical and operational specifications. In preparation of this future upgrade to SATURN systems, in this paper, the SATURN technical and operational specifications are reviewed, and the network synchronization, frequency hopping, and communication setup parameters that are controlled by the Network (NET) Time, Time Of Day (TOD), Word Of Day (WOD), and Multiple Word of Day (MWOD) are described in addition to SATURN Edition 3 (ED3) and future Edition 4 (ED4) basic features. In addition, an anti-jamming performance analysis (in reference to partial band jamming and pulse jamming) and the time delay queueing model analysis are conducted based on a SATURN transmitter and receiver assumed model.
Numerical simulation of heat transfer flows by a direct solution of generalized kinetic models
Yang, Taeho,Kwon, Oh Joon Elsevier 2018 Computers & fluids Vol.164 No.-
<P><B>Abstract</B></P> <P>The heat conduction between two infinite parallel plates is numerically simulated based on a kinetic relaxation model for one-dimensional flows. For this purpose, two distribution functions which depend only on longitudinal velocity are introduced to avoid the multiplicity of integrals. The kinetic model equations in terms of newly defined functions are used to investigate one-dimensional heat transfer between two walls of constant temperature ratio. Generalization of the kinetic models allows the correct estimation of the heat flux for arbitrary Prandtl numbers. The steady solutions are compared with the results of the exact Boltzmann equation to validate the possibility of applying the present kinetic models. The temperature jumps near the solid surface are naturally achieved by the difference of the particle distributions from a local equilibrium state. It is shown that the relative temperature jumps at both plate surfaces increases as the Knudsen number of the flow increases. The temperature profiles by means of the generalized kinetic models agree well with those of the exact Boltzmann equation for various Knudsen numbers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A solution of generalized kinetic models is applied to describe heat transfer flows. </LI> <LI> The temperature jumps are successfully calculated by the current methodology. </LI> <LI> The temperature jump at solid wall increases as the Knudsen number increases. </LI> <LI> The predicted results are in good agreement with those of other kinetic approaches. </LI> </UL> </P>
창업기업의 연구개발 투자와 지적재산권 취득이 은행 차입 및 차입비용에 미치는 영향에 관한 연구
양태호(Taeho Yang),김성환(Sunghwan Kim) 한국창업학회 2018 한국창업학회 Conferences Vol.2018 No.2
본 연구에서는 국내 10,166개 소규모 기업을 대상으로 2010년도부터 2015년까지의 37,425 연도별 관측치를 이용하여 연구개발 투자 및 지적재산권 취득이 은행으로부터의 자금 차입 및 차입비용에 미치는 영향을 고정효과 패널모형을 이용하여 분석하였으며, 주요한 그 결과는 다음과 같다. 첫째, 창업기업 집단의 연구개발 투자는 소규모 기업이 은행으로 부터의 차입에 부정적인 영향이 존재하지 않는다. 창업 후 일정기간 지난 창업기업의 금융기관 차입에 있어서 부정적인 영향이 있다. 둘째, 창업기업 집단의 지적재산권 취득은 소규모 기업이 금융기관으로 부터의 차입함에 긍정적인 영향이 없다. 창업 후 일정기간 지난 창업기업의 금융기관 차입에는 긍정적인 영향이 있다. 셋째, 창업기업 집단의 연구개발 투자는 소규모 기업의 은행 차입비용을 줄이지 못한다. 넷째, 창업기업 집단의 연구개발 투자는 은행 차입비용을 줄이지 못하지만 창업기업 5년이 경과한 기업의 연구개발투자는 차입비용을 줄이는 효과가 있다. 다섯째, 전체 기업과 창업 후 5년 이내의 기업의 지적재산권 취득은 은행 차입비용을 증가시키는 것으로 나타났다. This study investigates the effects of R&D investments and property right acquisitions of startup firms in Korea on bank borrowings and the cost of debt financing, using firm-level data from 2010 till 2015 with 37,425 observations of 10,166 startups. We compare non-startups and startups. We find that the R&D investments of startups are not negative in borrowing from banks, compared with those of non-startups, that the property right acquisitions of startups are not positive in borrowing from banks, compared with those of non-startups, that the R&D investments of startups are not effective in lowering borrowing costs from banks, compared with those of non-startups, and that the property right acquisitions of startups increases borrowing costs from banks, compared with those of non-startups,