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Ha, Jungmin,Kim, Myoyeon,Kim, Moon Young,Lee, Taeyoung,Yoon, Min Young,Lee, Jayern,Lee, Yeong‐,Ho,Kang, Young‐,Gyu,Park, Jun Seong,Lee, John Hwan,Lee, Suk‐,Ha John Wiley & Sons 2018 Journal of the Science of Food and Agriculture Vol.98 No.6
<P>CONCLUSIONWe detected major differences in the transcriptional levels of genes involved in the biosynthesis of proanthocyanidin and anthocyanin among genotypes beginning at the early stage of seed development. The results of the present study provide insights into the underlying genetic variation in proanthocyanidin biosynthesis among soybean genotypes. (c) 2017 Society of Chemical Industry</P>
Two dimensional magnetotelluric inversion via reverse time migration
Taeyoung Ha 한국산업응용수학회 2006 한국산업응용수학회 학술대회 논문집 Vol.1 No.1
The objective function is defined by complex apparent resistivity, which is calculated by the couple of electric field and magnetic field[2]. The important issue is to take the objective function using the logarithm of complex apparent resistivity. This method already was introduced by Shin and Min[5] in seismic wavefield. Shin and Min define the objective function as l₂ norm with logarithm of amplitude-only or phase-only or both amplitude and phase of wavefield. In this paper, the objective functions of three types are used, and is built with amplitude-only, phase-only or both amplitude and phase of complex apparent resistivity, respectively. As the results, we can calculate the steepest descent direction without computing Jacobian matrix directly and arrive the conclusion that the steepest descent direction is calculated by the inner product between the virtual source vector and the vector backpropagating residual vector.
Robust seismic waveform inversion
Taeyoung Ha,Wookeen Chung,Changsoo Shin 한국산업응용수학회 2007 한국산업응용수학회 학술대회 논문집 Vol.2 No.1
For seismic imaging and inversion, the inverted image depends on how we define the object function. ?¹-norm is more robust than ?²-norm. However, it is difficult to apply the Newton-type algorithm directly because the partial derivative for ?¹-norm has a singularity. To overcome the difficulties of singularities, Huber function given by hybrid ?¹/?²-norm is used. We tested the robustness of our new object function with several noisy data set.
HE-MAC: Harvest-Then-Transmit Based Modified EDCF MAC Protocol for Wireless Powered Sensor Networks
Ha, Taeyoung,Kim, Junsung,Chung, Jong-Moon IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.1
<P>Energy transfer (ET) and energy harvesting (EH) through radio frequency (RF) signals are a promising technology that can reduce the dependency on batteries in wireless sensor networks. However, there is a tradeoff between the RF-based ET and data communication when they operate in the same frequency band. Therefore, a proper medium access control (MAC) protocol is needed in wireless powered sensor networks (WPSNs). However, a utilization degradation problem occurs when the distributed coordination function (DCF) MAC protocol of the IEEE 802.11 is applied to WPSNs. In order to overcome this problem, this paper extends the IEEE 802.11e enhanced DCF (EDCF) into a harvest-then-transmit-based modified EDCF MAC (HE-MAC) protocol. In addition, the HE-MAC’s Markov chain model and steady-state probabilities are derived and used in the performance analysis. Next, based on the steady-state conditions, optimization is conducted to maximize the EH rate, which satisfies the frame generation rate and transfers additional energy to achieve a self-sustained energy consumption profile. Finally, the simulation performance of EH protocols HE-MAC, RF-MAC, and DOS are compared, where the results show that HE-MAC provides in a superior performance for the range of interest.</P>
Error analysis of one-dimensional Helmholtz equation with PML boundary
Taeyoung Ha,Imbunn Kim 한국산업응용수학회 2006 한국산업응용수학회 학술대회 논문집 Vol.1 No.2
In this paper, the linear conforming finite element method for the one-dimensional Berenger's PML boundary is investigated and well-posedness of the given equation is discussed. Furthermore, optimal error estimates and stability in the the L² or H¹-norm are derived under the assumption that h, h²ω² and h²ω³ are sufficiently small, where h is the mesh size and ω denotes a fixed frequency. Numerical examples are presented to validate the theoretical error bounds.