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Overview of Nanoelectronic Devices 스크랩

  • David Goldhaber-Gordon/Michael S.Montemerlo/J. Christopher Love/Gregory J. Opteck/James C.Ellenbogen
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  • 전기/전자

Nanotechnology 연구자료 This paper provides an overview of research developments toward nanometer-scale electronic switching devices for use in building ultra-densely intergrated electronic computers. Specifically, two classes of alternatives to the field-effect transistor are considered: (1)Quantum-effect and single-electron solid-state devices and (2)molecular electronic devices. A taxonomy of devices in each class is provided, operational principles are described and compared for the various types of devices, and the literature about each is surveyed. This information is presented in non-mathematical terms intended for a general, technically interested redership.

1999-12-24

RESTEC (42호) 스크랩

ADEOS, TRMM에 의한 해양 파라미터 추정수법의 연구, 위성 데이타를 이용한 톤레삿포(トンレサップ)호의 수역변동검출수법의 연구, RADARSAT스테레오SAR데이타에 의한 고도측정, 중국한강유역에 대한 수문해석을 위한 위성 데이타세트 작성, 암수산의 화산활동에 따르는 지반변동에 관하여, 1998년도 외부위탁연수실태보고,리모트센싱기술연수, 지구관측전시회98개최보고, 정보 서비스.시스템작업부회(WGISS)지원보고, IRS위성 및 RADARSAT위성 데이타등에 관한 내용을 싣고 있다.

1999-12-24

Architectures for molecular electronic computers: 1. Logic structures and an adder built from molecular electronic diodes 스크랩

  • James C. Ellenbogen/J.Christopher Love
  • |
  • 전기/전자

Nanotechnology 연구 관계 자료 Recently, there have been some significant advances in the fabrication and demonstration of individual molecular electronic wires and diode switches. This paper shows how these demonstrated molecular devices might be combined to design molecular-scale electronic digital computer logic. The design for the demonstrated rectifying molecular diode switches is refined and made more compatible with the demonstrated wires through the introduction of intramolecular dopant groups chemically bonded to modified molecular wires. Quantum mechanical calculations are performed to cahracterize some of the electrical properties of the proposed molecular diode switches. Explicit structural designs are displayed for AND, OR, and XOR gates that are built from molecular wires and molecular diode switches. These diode-based molecular electronic logic gates are combined to produce a design for a molecular-scale electronic half adder and a design for a molecular-scale electronic full adder. These designs correspond to conduct ve monomolecular circuit structures that would be one million times smaller in area than the corresponding micron-scale digital logic circuits fabricated on conventional solid-state semiconductor computer chips. It appers likely that these nanometer-scale molecular electronic logic circuits could be fabricated and tested in the foreseeable future. At the very least, these molecular circuit designs constitute an exploration of the ultimate limits of electronic computer circuit miniaturization. In that connection, examination of these designs suggests that diode switches alone probably will not be sufficient to operate such extended molecular electronic circuitry. Three-terminal switching devices that produce power gain probably are required. Nonetheless, molecular diode switches and diode-based logic are likely to be important components of future molecular electronic digital circuits, if only because they demand many fewer interconnects and, consequently, should make such ultra-dense circuitry much ease r to design and to fabricate. In its treatment of the foregoing innovations and analysis, this work addresses two of the architectural issues that will by encountered in the fabrication and operation of a molecular electronic computer: the issues of design and interconnets. A more complite enumeration of such issues is discussed, with a view to considering the assembly of a molecular electronic computer using logic gates similar to or based upon those designs proposed here.

1999-12-24

JST ニュ-ス(No.31) 스크랩

  • 김은정 김은정
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  • 충남대학교
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  • 과학기술과 인문사회

일본 과학기술진흥사업단에서 발행하는 소식지로서 1999년도의 예산과 사업설명, 1998년도국제공동연구 태국과의 연구 프로젝트 발족, 제34회 과학기술정보진흥상 수상후보모집공고, 기술이전, 위탁개발과제선정 4건, 사업단인사등에 관한 소식, JICST찬조회회원모집공고, 전략적 기초연구 1998년도 신포지움보고, 앞서나가는 연구21 [인간, 그 연구](31) 에 관한 내용을 싣고 있다.

1999-12-24

Sensory Evaluation of Indoor Air Quality 스크랩

  • EUROPEAN COMMISSION
  • |

Human subjects are indispensable in the measurement of perceived indoor air quality. Chemical and physical methods of characterisation often are insensitive to odorous and sensory irritating air pollutants, or do not take account of combinations of singular pollutants in a biologically meaningful way. Therefore, sensory methods many times are the only or the preferred tool for evaluation of perceived indoor air quality. This Report presents background to and advice on methodologies for sensory evaluation of perceived indoor air quality. It proposes methods which apply to source saaessments as well as field investigations. The methods will assist in labelling of building materials, characterising air quality in indoor spaces, controlling ventilation performance, and measuring occupant responses in questionnaire field studies of the sick building syndrome. The proposed methods will enable designers, manufacturers, chemical and ventilating engineers, consumers, building and health authorities, and other decision makers to compare and selest appropriate building materials, furnishings etc. Therefore the design, supply and control for good perceived air quality in indoor spaces will be easified which will lower the costs and minimize waste of energy.

1999-12-23

Green Port Report(No.70) 스크랩

Contents *The new north wing and the new section, central building of passenger terminal 1 open on March 16 in preparation for the 21st century *Four-year construction work completed and the enw facilities are more convenient, more safe and more comfortable *Fundamental blueprint for an eco-airport progressing well *Four new projects added *Teams of handlers and drug detector dogs work together Ms.Makiko Ino, Handler of Drug detector dogs, enforcement division, Tokyo customs *From Airports : Narita airport, Kansai international airport *Data ; aircraft movements and air cargo handled show January records, exports and imports for January Low & Trade Balance turn to deficit for Japan, Outbound Japanese traffic showed first increase in 17months since August 1997

1999-12-23

The Role of Technolgoy in Responding to Concerns About Global Climate Change 스크랩

A White Paper from the BUSINESS ROUNDTABLE) -Contents- Executive Summary Overview I.Introduction II.Technology Development in the Transportation Sector III.Technology Development in the Industrial Sector IV.Technology Development in the Commercial Sector V.Technology Development in the Residential Sector VI. Technology Development in the Electric Sector VII.Technology Development in Carbon Sequestration VIII.Observations and Recommendations

1999-12-23