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Kim, Bongjae,Kim, Kyoo,Min, B. I. American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.89 No.11
We have investigated the pressure-induced spin-state transition in Co2+ systems in terms of a competition between Hund's exchange energy (J) and crystal-field splitting (Delta(CF)). First, we show the universal metastability of the low-spin state in octahedrally coordinated Co2+ systems. Then we present the strategy to search for a Co2+ system, for which the mechanism of spin-state and metal-insulator transitions is governed not by Mott physics but by J versus Delta(CF) physics. Using CoCl2 as a prototypical Co2+ system, we have demonstrated the pressure-induced spin-state transition from high-spin to low-spin, which is accompanied with insulator-to-metal and antiferromagnetic to half-metallic ferromagnetic transitions. Combined with the metastable character of Co2+ and the high compressibility nature of CoCl2, a transition pressure as low as 27 GPa can be identified on the basis of J versus Delta(CF) physics.
Bongjae Kim,Hong Chul Choi,Kyoo Kim,B. I. Min 한국자기학회 2008 Journal of Magnetics Vol.13 No.4
We have investigated the electronic structures and magnetic properties of both undoped and doped bcc Ni using the full-potential linearized augmented plane wave (FLAPW) band method. A ferromagnetic ground state is obtained at the equilibrium volume of bcc Ni. When the system is under strain, the nonmagnetic ground state is stabilized. When the Ni is doped with V, the Ni16-xVx material loses its magnetic properties when x > 2. We have also discussed the possible superconducting properties of Ni16-xVx.
A Survey on Qualitative Analysis of Directional VANET MAC Protocols
Kim, Bongjae,Cho, Kwangsu,Nam, Choonsung The Korea Contents Association 2014 International Journal of Contents Vol.10 No.2
Since vehicles' trajectories are so complex and dense traffic changes in nature frequently, the VANET (Vehicles Ad-hoc Network), using Omni-directional Antenna, has many channel collisions (or overlapping) on Data Link phrases (MAC layers). It is not easy to keep a good seamless communication status for VANET because of its unpredictable network environment. Among VANET research, Directional Antenna have been proposed as one of the most common systematical solutions to reduce (or to mitigate) this miss-communication problems by narrowing communicational ranges and making use of its customized error-detection process. However, even though Directional Antennas help VANET keep good seamless communication, many VANET researchers have reported that Directional VANET still has miss-communicational problems - this has lead to problems like 'Directional Hidden Terminal Problem', 'Deafness', 'Un-accuracy Lobe Scopes' and 'High Deployment Cost' being reported in various papers. To establish well-organized design assessments for a good Directional VANET MAC protocol to overcome these problems, we rearranged and grouped current Directional VANET' qualitative criteria from several current survey papers using these categories- 'Directional Discovery', 'Directional Forwarding' and 'Directional Handover'. In addition, based on the results of the following analysis, we show the essential design concerns that need to be looked at in order to develop a well-designed Directional-VANET MAC protocol.