Requisites and Restrictions of Business Dismissal Trends in Recent Decisions

In recent years, management dismissals have become a social problem because of strong enforcement of competition principles, acceleration of enterprise structural reforms and execution of mass dismissals in so-called globalization era. When one considers the social character of management dismissal, it is clear that the laws that regulate management dismissals exert an enormous influence on job securities for employees as well as improvement of enterprise management. The object of this article is to examine the trends as revealed in recent judicial decisions, finding logic in them and laying foundations for just application of the laws. The author argues that after the amendments of the statutes, the Court at once seized four requisites for effective management dismissal, in essence clinging to old precedents which require the dismissal to be admitted as completely and objectively reasonable and socially rational when considered as a whole. He further underscores that a dismissal lacking even one requisite is to be considered illegal dismissal that is deficient in objective reasonableness and social rationality. Lastly, the author argues that the meaning of the prior conference with labor representative should be interpreted not as a simple process of collecting opinionsjust like the Courts do, but as laborers understanding or comprehensionthrough sincere exchange of opinions

IEEE 802.16e 에서 멀티캐스트 MAP 의 효율적 전송 기법

The IEEE 802.16e suggests the use of multicast sub-MAPs whose messages are differently encoded according to the operating condition. In this case, it is desired for the base station to properly choose a modulation and coding set (MCS) associated with operating condition. In this paper, we consider the use of an adaptive modulation coding (AMC) scheme for the multicast sub-MAP that achieves the same MAP coverage as the broadcast MAP while minimizing the signaling overhead. We consider the adjustment of the threshold for the AMC according to the channel condition without explicit information on the channel condition, significantly reducing the amount of the signaling overhead. Simulation results show that when it is applied to voice-over-IP (VoIP) services, the proposed scheme can enhance the VoIP capacity

Mitigation of inter-cell interference in the WiMAX system

The Worldwide Interoperability for Microwave Access (WiMAX) can provide wireless services at high rates even in high mobility, but it can suffer from serious inter-cell interference (ICI) near the cell boundary. To mitigate the ICI problem in the downlink of mobile-WiMAX, we consider combined use of interference avoidance and cancellation techniques in addition to inter-sector coordination, maximizing the user capacity in a seamless manner. To make the proposed scheme realizable, we maximize the geometry capacity. Simulation results show that the proposed scheme can improve the capacity of users near the cell boundary over the conventional schemes and provide flexibility in resource allocation.KT research projec

Inter-sector Beamforming with MMSE Receiver in the Downlink of TDD Cellular Systems

The use of beamforming is effective for users in limited power environments. However, when it is applied to the downlink of a cellular system with universal requency reuse, users near the sector boundary may experience significant interference from more than one sector. The use of a minimum mean square error (MMSE)-type receiver may not sufficiently cancel out the interference unless a sufficient number of receive antennas are used. In this paper, we consider the use of inter-sector beamforming that cooperates with a neighboring sector in the same cell to mitigate this interference problem in time-division duplex (TDD) environments. The proposed scheme can avoid interference from an adjacent sector in the same cell, while enhancing the transmit array gain by using the TDD reciprocity. The performance of the proposed scheme is analyzed in terms of the output signal-to-interference-plus-noise power ratio (SINR) and the output capacity when applied to an MMSE-type receiver. The beamforming mode can be analytically switched between the inter-sector and the single-sector mode based on the long-term channel information. Finally, the effectiveness of the proposed scheme is verified by computer simulation.IT R&D program of MKE/IITA (2008- F-007-0

모바일 와이맥스 시스템에서 주변 셀의 신호 세기 정보를 이용한 인접 셀 간섭 감소 기법

The Mobile-Worldwide Interoperability for Microwave Access (m-WiMAX) can provide wireless services at high rates even in high mobility. However, the performance of m-WiMAX can seriously be degraded near the cell boundary due to inter-cell interference (ICI). To mitigate the ICI problem in the downlink of m- WiMAX, we consider combined use of ICI mitigation techniques with macro beamforming to maximize the user capacity in response to the change of interference environment. The proposed scheme optimally determines the configuration of ICI mitigation techniques using the geometrical information (e.g., the longterm received signal strength of neighboring cells). Simulation results show that the proposed scheme can accurately estimate the user capacity and thus improve the capacity of users near the cell boundary.KT research projec

TDD 기반의 셀룰라 시스템에서 하향링크 다중 섹터 빔포밍 기법

The use of beamforming is effective for users in limited power environments. However, when it is applied to the downlink of a cellular system with universal frequency reuse, users near the sector boundary may experience significant interference from more than one sector. The use of a minimum mean square error (MMSE)-type receiver may not sufficiently cancel out the interference when a small number of receive antennas is used. In this paper, we consider the use of inter-sector beamforming that cooperates with a neighboring sector in the same cell to mitigate this interference problem in time-division duplex (TDD) environments. The proposed scheme can avoid interference from an adjacent sector in the same cell, while enhancing the transmit array gain by using the TDD reciprocity. The performance of the proposed scheme is analyzed in terms of the output signal-to-interference-plus-noise power ratio (SINR) with combined use of an MMSE receiver. The effectiveness of the proposed scheme is verified by computer simulation