• ETRI Journal
• /
• v.26 no.3
• /
• pp.189-194
• /
• 2004

We demonstrate a high-speed recording based on field-induced manipulation in combination with an optical reading of recorded bits on Au cluster films using the atomic force microscope (AFM) and the near-field scanning optical microscope (NSOM). We reproduced 50 nm-sized mounds by applying short electrical pulses to conducting tips in a non-contact mode as a writing process. The recorded marks were then optically read using bent fiber probes in a transmission mode. A strong enhancement of light transmission is attributed to the local surface plasmon excitation on the protruded dots.

• Journal of the Korean housing association
• /
• v.16 no.4
• /
• pp.65-71
• /
• 2005

The present study performed subjective evaluation experiments using slides and scale down models in order to propose guidelines for lighting environment desirable for each behavior in the house. The evaluation measure was composed of 20 mood items and 15 behavior items. As for experiment methods, the slide experiment used SD method, and the scale down model experiment used Scheffe's paired comparison. The results of this study are as follows. 1) Desirable lighting environment for working and talking is active atmosphere. 2) Lighting environment desirable far relaxation is to heighten lighting contrast using candescent lamps and local lights. In other words, active atmosphere, which is desirable for working and talking, is not desirable for relaxation. 3) Lighting for working requires bright illuminance and high color temperature(6000k). 4) Lighting for relaxation requires somewhat low brightness regardless of color temperature. If the light is bright it is better to use lamps of low color temperature. 5) for conversation, bright illuminance is more desirable than dark one, and the most adequate color temperature is 4000K.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2012.08a
• /
• pp.117-117
• /
• 2012

Si:Ge alloy semiconductor nanocrystals (NCs) offer challenging opportunities for integrated optoelectronics/optoplasmonics, since they potentially allow unprecedentedly strong light-matter interaction in the wavelength range of the optical communication. In this talk, we discuss the recent research efforts of my laboratory to develop optoelectronic components based on individual group IV NCs. We present experimental demonstration of the individual NC optoelectronic devices, including broadband Si:Ge nanowire (NW) photodetectors, intra NW p-n diodes, Ge NC electrooptical modulators and near-field plasmonic NW detectors, where the unique size effects at the nanometer scales commonly manifest themselves. In particular, we demonstrated a scanning photocurrent imaging technique to investigate dynamics of photocarriers in individual Si:Ge NWs, which provides spatially and spectrally resolved local information without ensemble average. Our observations represent inherent size-effects of internal gain in semiconductor NCs, thereby provide a new insight into nano optoplasmonics.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.2 no.3
• /
• pp.138-144
• /
• 2007

Wireless Sensor Network(WSN) consists of a lot of light-weight sensor nodes with the capability of wireless communication. Studies have been done to improve stability and fault-tolerancy of WSN because the sensor nodes are basically vulnerable to the harsh environment. Specially, the time synchronization among sensor nodes becomes a challenging issue in WSN. All the local times should always keep the same with each other in the sensor field to perform data aggregation and energy-aware communication in WSN. In this paper, a new time synchronization technique is proposed to operate efficiently irrespective of the number of sensor nodes and the number of hops needed to cover all sensor nodes for synchronization. Simulation results show that the proposed technique has the lowest amount of packet traffic among the several time synchronization techniques.

• Journal of Institute of Control, Robotics and Systems
• /
• v.5 no.4
• /
• pp.419-426
• /
• 1999

A novel motion analysis system is presented in this paper. The proposed system is inspired by processing functions observed in the fly visual system, which detects changes in input light intensities, determines motion on both the local and the wide-field levels. The system has several differences from conventional motion analysis system. First, conventional systems usually focused on matching similar feature or optical flow, but neural network is applied in this system. Back propagation is used by learning method, and Tine Delay Neural Network (TDNN) is also used as analysis method. Second, while conventional systems usually limited on only two frames of sequence, the proposed system accept multiple frames of sequence. The experimental results showed a 94.7% correct rate with a speed of 71.47 milli seconds for real and synthetic images.

• World Technopolis Review
• /
• v.6 no.2
• /
• pp.113-129
• /
• 2017

Universities are considered important actors and drivers of socio-economic development in the regional innovation eco-system. This article investigates the role Kenyan universities and research institutes play in the development of regional innovation eco-system in the context of triple and Quadruple helices. A model involving Government, Industry, Universities and Society (Public) linkages in the regional innovation eco-system and with Information and Communication Technology as an enabler is used as a framework for analysing the nature of linkages in Kenya. The article uses literature review and case study methods to examine how universities and research institutes can spur the development of the innovation eco-systems. The research question is: what is the role of Kenyan universities and research institutes in spurring innovation ecosystems? Six cases of Kenyan universities and research institutes are considered in the light of Government Policy on Science, Technology and Innovation (STI) which is underpinned in Kenyan constitution 2010. The study contributes to the understanding of how deep collaboration among universities, government, research institutes, Science Cities, local, regional, national and international players spurs the creation of world-class innovation ecosystems which can contribute to regional development in developing countries like Kenya.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.8 no.5
• /
• pp.24-33
• /
• 1994

본 연구는 의류매장 쇼윈도를 연구대상으로 하여 바람직한 의류매장 쇼윈도의 조명환경을 제시하고자 한다. 이에 실제 쇼윈도 크기 모형내에서 조명조건의 질적인 측면에 주목하여 조명이 전시효과에 미치는 영향을 파악하였다. 그 결과 평균크기 쇼위도내에서 본 실험조건 중에서"변화성"을 중시하는 경우에는 위치 45[cm], 각도 $0^{\circ}$, 광원용량 500[W], 전반조명을 사용했을 때, "명시성"을 중시할 경우에는 위치 180[cm], 각도 $45^{\circ}$, 광원용량 500[W], 전반조명을 사용했을 때, "정서성"을 중시할 경우에는 위치 180[cm], 각도 $-45^{\circ}$, 광원용량 500[W], 전반조명을 사용했을 때의 조명환경을 만들어 주면 가장 평가가 높다는 사실을 밝혔다.경을 만들어 주면 가장 평가가 높다는 사실을 밝혔다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.18 no.1
• /
• pp.21-27
• /
• 2004

This experimental study investigates the showcase display of cosmetic shops among the commercial space to suggest a desirable lighting by focusing on the lighting surroundings. The important outcomes of this study are summarized below. The result of the experiment for the showcase lighting； they need put the higher intensity lighting in inside for the local lighting and different effect. And for the emotional response, they need to put the horizontal lighting which is installed the behind of showcase and the vertical lighting for the front line lighting system.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 2006.11a
• /
• pp.39-43
• /
• 2006

In recent years, local governments are interested in constructing museums of various scales in relationship to unique factors of each region regarding their positive effects on tourist industry. However, many museums have failed to reflect regional characteristics resulting uniformed, uninteresting museum architectures. This study analyzes museum architectures designed by Ando Dadao, Antoine Predock's, Charles Correa, Carlo Scarpa, and Ricardo Legorrata based on 7 criterias of Kenneth Prampton's critical regionalism theory which are natural environment, materials, light, weather, unique culture, and history. It Is hoped that this study may serve as a stopping stone towards designing museums that reflect distinctive regional identities of Korea.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.27 no.6
• /
• pp.1-8
• /
• 2013

In this paper, we proposed a smart lighting management system controls the lighting efficiently to reduce energy consumption while satisfying user's lighting requirements. The proposed system considers the available daylight intensity and indoor light source to satisfy the lighting requirements of each user according to the work environment. In addition, for user convenience, we have developed different user interfaces for lighting control including local interface, and remote interface through internet or Bluetooth for personal computer as well as smart phones. The proposed system satisfies the lighting requirements of each user according to the corresponding work environment. The proposed smart lighting management system utilizes the lighting energy efficiently, and can be considered a significant contribution towards future green buildings.