Seongjin Kim

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This paper proposes a new actuator system using a movable pulley for a bio-mimetic system and wearable robot applications, which is able to store energy in advance and to release it in such a way to satisfy desired speed and force control performances, simultaneously. Since new actuator system consists of two motors (dual-motors), a movable pulley, and(More)
In this paper, we investigate an energy-efficient resource allocation problem in a two-way relay (TWR) network consisting of multiple user pairs and an amplify-and-forward (AF) relay. As the users and relay have individual energy efficiencies (EE), we formulate a multi-objective optimization problem (MOOP). A single-objective optimization problem (SOOP) of(More)
In this paper, the power allocation problem is solved in the context of maximizing the energy efficiency (EE) of orthogonal frequency division multiplexing (OFDM) signaling over a two-way amplify-and-forward (AF) relay network with two sources and one relay. The EE is defined as the ratio of the system throughput over the total power consumption(More)
Radio frequency identification (RFID) technology has been applied to many business areas to simplify complex processes and gain important benefits. To derive real benefit from RFID, the system must rapidly implement functions to process the large quantity of event data generated by RFID operations and should be configured dynamically for changing(More)
In recent, domestic livestock farms are receiving enormous damages through various livestock diseases that are highly contagious such as foot-and-mouth disease and avian influenza (AI). Additionally, they are experiencing difficulties also financially as a result of decrease in income from production cost increase. This paper will propose a livestock(More)
The estimate of free energy changes based on Bennett's acceptance ratio method is examined in several limiting cases and compared with other estimates based on the Jarzynski equality and on the Crooks relation. While the absolute amount of the dissipated work, defined as the surplus of the average work over the free energy difference, limits the practical(More)
We consider digital predistortion (DPD) for linearizing power amplifiers (PAs) of hybrid MIMO systems with subarrays. Designing such a DPD scheme is difficult because one DPD should linearize all PAs of a subarray whose beamforming coefficients are time-varying. We develop an adaptive DPD technique for each subarray based on direct learning method(More)
We investigate the orbital magnetization of DNA molecules in the relaxed circular structure. It is shown that DNA of homogeneous sequence exhibits paramagnetic responses to external magnetic fields and, surprisingly, the magnetism of circular DNA is equivalent to that of linear DNA. This turns out to result from the fact that the electron population is(More)