Research Issues for Energy Efficient Cellular Networks Prof. Vijay Bhargava-2013 제5회 정보전자융합공학부 국제심포지엄 포항공과대학교 Vijay Bhargava, Harri Siitari, Ajay Agarwal, Prasant Mohapatra, Mikio Aoyama, Dongman Lee, Ben Lee

The rising energy costs and carbon footprint of operating cellular networks have led to a trend in addressing energy-efficiency amongst the network operators and regulatory bodies such as 3GPP and ITU. "Greening" the wireless networks is a vast research discipline that needs to cover all the layers of the protocol stack and various system architectures and it is important to identify the fundamental trade-offs linked with energy efficiency and the overall performance. In this talk, we identify four important aspects of a green networking where we would like to focus: defining green metrics, bringing architectural changes in base stations, network planning, and efficient system design. We begin with a brief discussion on energy efficiency metrics. Since Base Stations (BSs) consume a major chunk of input energy, we discuss the energy efficiency of BSs. Next we discuss energy efficiency from a network planning perspective, based on smaller cells for heterogeneous networks. For system design, we put a special emphasis on cognitive and cooperative techniques in order to realize energy efficient cellular systems. Finally we discuss some broader perspectives and possible future trends in realizing a green cellular network technology.
 LINK ORIGINAL EN LA WEB
http://kocw.net/home/search/kemView.do?kemId=698269

Electronic Circuits -OPEN COURSEWARE -DAEGU UNIVERSITY

LINK
http://lms.daegu.ac.kr/ilos/ocw/opencourse_week_view_form.acl?OPENCOURSE_NUM=41&start=1&display=10&WRTSRC=&FIELD_NO=19

DESIGN OF BIRECTIONAL PWM SEPIC/ZETA DC-DC CONVERTER -SUNJO LEE-2009

DESIGN OF BIDERECTIONAL PWM SEPIC/ZETA DC-DC CONVERTER -SUNJO LEE
DEPARTMENT OF ELECTRICAL ENGINEERING  THE GRADUATE SCHOOL PUKYONG NATIONAL UNIVERSITY

LINK
http://www.mediafire.com/download/0n0s26c1dl0ya42/PWMSEPICFULL2009.pdf

Current Programmed Control of Three Phase PWM AC-AC Converter Yulong Li - Department of Electrical Engineering Graduate School Yosu National University

Current Programmed Control of Three Phase PWM AC-AC Converter 
 A Thesis for the Degree of Master of Engineering Yulong Li 
Department of Electrical Engineering Graduate School Yosu National University February 2006

 Abstract
In this thesis, a new scheme of current programmed control for three phase PWM AC-AC converter is proposed. Compared to duty-ratio voltage control, current programmed control has several advantages such as reduction of system order, inherent current protection and robust output. By considering only the magnitude components, a similar scheme in the DC-DC converter can be extended to the three phase PWM AC-AC converter. The proposed current programmed control will be well adopted into various converter topologies and three phase PWM AC-AC buck, boost and buck-boost converter are treated. The converter analysis is carried out by applying the vector DQ transformation to obtain physical insight into the converter operation and to establish some important characteristic equations for control purpose. The experiment results show the validity of the proposed scheme.

LINK
http://www.mediafire.com/download/7326xlk38o98on6/AC-AC-TRIF.pdf

Electromagnetism Sejong University PROF. YONGHO SEO - 전자기학 세종대학교 서용호

Based on the concept of engineering mathematics, learn static electric field and static magnetic field, steady current, and related problems. Apply the basic knowledge of the electromagnetism to electronics, electric engineering and device material engineering.
LINK ORIGINAL
http://www.kocw.net/home/search/kemView.do?kemId=1074223&ar=relateCourse