A New Ultra-Wideband Balun and its Associated Components

-. 연 사 : 김강욱 교수 (경북대학교)

-. 일 시 : 2008년 12월 12일 (금) 오후 2:45 ~ 4:15

-. 장 소 : LG동 105호

-. 초청자 : 박 위 상 교수 (T.2224)

Abstract

A recently developed ultra-wideband (UWB) balun opens new possibilities for the low-cost, mass-producible, and surface mountable UWB components with 10’s of GHz bandwidth. The balun is a simple microstrip-to-coplanar stripline transition structure, but a single balun can be designed to have operating frequency range from DC to over 40 GHz. The balun design is based on optimal impedance matching and smooth field transformations between adjacent transmission lines. Utilizing this uniplanar balun, new low-cost and mass-producible components—e.g., mixers, doublers, antennas, detectors, differential amplifiers, etc.—with 10’s of GHz bandwidth are being developed. The new UWB components can also be designed in the form of low-cost surface-mountable chips, which may open new commercial UWB application areas.
In this presentation, the design of the ultra-wideband balun will be described, and recent developments of new UWB components utilizing the balun will also be introduced

Network Design Techniques by Evolutionary Algorithm”

-. 연 사 : 현 광 남 교수 (Waseda University)

-. 일 시 : 2008년 11월 28일 (금) 오후 2:45 ~ 3:45

-. 장 소 : LG동 105호

-. 초청자 : 박 위 상 교수 (T.2224)

Abstract

Network design optimization is basically a fundamental issue in the various fields, including applied mathematics, computer science, engineering, management, and operations research. Network models provide a useful way for modeling various real world problems and are extensively used in many different types of systems: communications, mechanical, electronic, manufacturing and logistics. However, many practical applications impose on more complex issues, such as, complex structure, complex constraints, and multiple objectives to be handled simultaneously and make the problem intractable to the traditional approaches.

Recent advances in evolutionary algorithms such as genetic algorithm, genetic programming, and evolution strategy have made it possible to solve such practical network design and scheduling problems. The seminar talk introduces Network Design Techniques based on Evolutionary Algorithm such as the shortest path model for Internet OSPF Routing Model and Car Navigation System, several minimum spanning models, bicriteria max flow/minimum cost flow problem and capacitated QoS (Quality of Service) network model:

Part 1: Multiobjective Genetic Algorithms

Part 2: Shortest Routing Model and Applications

Part 3. Minimum Spanning Models

Part 4: Bicriteria MXF/MCF Model

Part 5: Capacitated QoS Network Model

Reference: M. Gen, R. Cheng & L. Lin: Network Models & Optimization:

Multiobjective Genetic Algorithm Approach, Springer, London, 2008. 

캠브리지대학의 제도와 운영

-.연 사 : 장수영 교수 (포항공대 전자과)

-. 일 시 : 2008년 12월 5일 (금) 오후 2:45 ~ 4:15

-. 장 소 : LG동 105호

Abstract

2009년에 창립 800주년을 맞는 캠브리지대학의 제도와 운영에 대하여 살펴본다. 캠브리지대학은 3년제이며, 학사과정은 11,021명, 대학원생 7,685명 등 18,706명의 학생을 가진 대학이며 연간 학사 3,346명, 석사 3,180명, 박사 981명을 배출한다.
31개의 College로 구성되어 있으나 College는 우리나라의 단과대학개념이 아니고 교육기능이 있는 기숙사를 뜻한다. 캠브리지대학은 지금까지 81명의 노벨수상자를 배출하면서 세계 최우수대학 중의 하나가 되었다.
연간 대학교 예산은 5억 2500만 파운드, College예산은 2억7000만 파운드로서 원화로는 1조6천억원에 해당된다.

◈ Title : Nano scale NAND flash memory, 3 bit per cell, 3D NAND structure
◈ Speaker : Principal engineer. Myoung Kwan, Cho (Hynix)
◈ Date & Time : Friday, April 8, 2011 (14:00pm ~ 15:30pm)
◈ Place : LG Research Building, Room #101
◈ Host : Prof.  Jeong-Soo, Lee  (Tel. 2380)
◈ Abstract : Recent NAND flash memory technology is presented, especially in terms of 3 bit per cell and 3D NAND structure. In the 2xnm era,  NAND cell scaling down have faced process complexity and narrow cell operation window. In this presentation, the operation algorithm in 3 bit per cell and the characteristics of 3D NAND cell is discussed.