Earticle

Focusing on the harmonization of multiple positioning algorithms, we develop a framework of context-aware location estimation. The nature of algorithms is carefully analyzed and then, estimation errors are minimized via the cooperated. The target environment focus on a manufacturing and service system. The hybrid positioning system can provide an efficient environmental knowledge for current and future manufacturing or service systems.

In order to provide the Mobile Stations operating in IEEE 802.11 Wireless LAN network with seamless handover, a comprehensive study on the functions of handover considering various networking environments and characteristics of Mobile Stations is required. Note that the channel scan process finding a new AP takes the major portion of handover time, and this is the most significant issue with seamless handover for real-time multimedia service in WLAN environment. In this paper the functions required to provide seamless handover in IEEE 802.11 WLAN network are identified, and a new scanning technique is proposed with which the Mobile Stations can selectively scan the channels to reduce the channel scan time in various network environments. Here each Mobile Station awares of the channels the neighbor APs are using by scanning them in advance according to the proposed technique. Afterwards, when handover is actually required, the optimal AP is decided quickly by scanning only the predetemined group of channels and order of scan without unnecessary scan of all the channels.

In the most of case In-building communication lines have a Optical fiber Cable. with this fiber, residers are consume so much data therefore make traffic increase every year for example CCTV, Security Lines, CableTV etc. Sometimes the residers are moving-in or moving-out, the other time they are change service provider. for this purpose We develop a ineuron system which automatically check the fiber cable and Facility Management. and this system software drives on Virtual Machine Server.

Recently, the high speed device to device(D2D) wireless communication technology has been studied for short distant mobile data transfer application. This paper presents 60 GHz OOK(On-Off Keying) non-coherent receiver which is a strong candidate for high speed D2D communication technology. The OOK receiver architecture is used because of its simple structure and low power characteristic. The receiver consists of three-stage low noise amplifier (LNA), fully differential envelop detector, and limiting amplifier(LA). The measured receiver shows 54 dB peak gain at -55 dBm input power level. The sensitivity of the receiver is measured -50 dBm under 3 Gbps data rate. The proposed receiver is fabricated with 65 nm CMOS process and its measured power consumption is only 21.5 mW. As a result, the proposed receiver achieves energy efficiency of 7.12 pJ/bit.

This paper presents a new 60 GHz amplifier design method using TSMC 90 nm CMOS technology. The proposed design scheme is based on the way of the distributed amplifier design with open gate & open drain. The proposed architecture is analyzed and we define the upper limit to adopt proposed method in designing 60 GHz amplifier. To verify the effectiveness of the proposed scheme, the 60 GHz power amplifier with three cascade structure is designed and measured. Thanks to the proposed design structure, the fabricated power amplifier shows 29 dB peak gain, 25 dB gain over the 56~65 GHz, 11.5 dBm OP1dB, 13 dBm saturation power and peak 18.8 % PAE(Power Added Efficiency) under 2V supply voltage. Judging from the measurement results, the suggested architecture is a promising way for the future millimeter wave CMOS amplifier.