http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
2개의 형광 도판트를 적용한 단일발광층 유기발광소자의 광학적 특성 연구
김태구,오환술,김유현,김우영,Kim, Tae-Gu,Oh, Hwan-Sool,Kim, You-Hyun,Kim, Woo-Young 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.3
Organic light-emitting diodes (OLEDs) with single emissive layer structures using two fluorescent dopants were fabricated and the device was composed of ITO / NPB ($700{\AA}$) / MADN : C545T - 1.0% : DCJTB - 0.3% ($300{\AA}$) / Bphen ($300{\AA}$) / LiF ($10{\AA}$) /Al ($1,000{\AA}$). C545T and DCJTB were functioned as green fluorescent dye and red fluorescent dye under MADN as host material. Concentrations of C545T and DCJTB was changed in emissive layer of MADN. Optimized OLED device using two fluorescence dopants shows emission efficiency of 8.42 cd/A and luminescence of 3169 cd/$m^2$at 6 V with CIE color coordinate, (0.43, 0.50). Electroluminescence of optimized OLED showed two peak at 500 and 564 nm according to C545T and DCJTB. These results indicate that F$\ddot{o}$ster energy transfer energy transfer was from MADN to C545T and rather than to DCJTB continuously. 두 가지의 형광도판트를 이용하여 제작된 단일 발광층 유기발광다이오드(OLEDs)는 ITO / NPB ($700{\AA}$) / MADN : C545T - 1.0% : DCJTB - 0.3% ($300{\AA}$) / Bphen ($300{\AA}$>) / LiF ($10{\AA}$) / Al ($1,000{\AA}$)으로 구성되었다. C545T와 DCJTB는 각각 녹색과 적색 도판트로 사용되었고, 호스트 물질인 MADN에 대해서 각각 다른 농도로 도핑하였다. 이러한 두 가지 형광도 판트를 사용한 제적화된 OLED는 8.42 cd/A의 효율과 6 V에서 $3169 cd/m^2$의 발광 휘도와 (0.43, 0.50)의 색좌표를 가졌다. 이러한 OLED 구조의 electroluminescence는 각각 C545T와 DCJTB에 따라 500 nm와 564 nm의 피크를 가졌다. 이러한 결과는 MADN에서 C545T로 C545T에서 DCJTB로 포스터 에너지 전이가 일어났음을 설명할 수 있다.
Dash7 기반 무선 센서 네트워크에서 링크 품질을 고려한 에너지 효율적인 클러스터 헤더 선출 기법
김태구(Tae-Gu Kim),정상화(Sang-Hwa Chung) 한국정보과학회 2013 정보과학회논문지 : 정보통신 Vol.40 No.5
많은 노드들로 구성된 무선 센서 네트워크에서는 전체 네트워크의 생존 시간을 극대화하여 센서 노드들이 보다 오랜 시간동안 주어진 임무를 수행하는 것이 중요한 요소이다. 에너지의 효율적인 사용을 위해 기존의 많은 연구들이 클러스터 기반에서 잔여 에너지 또는 거리 정보를 활용하여 시뮬레이션 환경에서 성능을 증명해 왔다. 하지만 무선 센서 네트워크가 실제 환경에 설치되었을 때에는 전파 환경에 따라 링크 품질이 달라지고 이로 인해 데이터의 유실이 발생할 수 있다. 이런 경우 재전송과 같은 추가적인 동작으로 인해 에너지 낭비가 발생할 수 있다. 본 논문에서 제안하는 방법은 실제 환경에 센서 네트워크가 구축되었을 때에 센서 노드들이 제각기 가지는 링크 품질 정보와 잔여 에너지 정보를 종합적으로 고려하여 에너지 효율적인 클러스터 헤더 선출 방법을 제시하여 추가적인 에너지 소모를 방지하였다. 제시한 기법의 성능 평가를 위해 Dash7 기반의 저전력 센서 네트워크 환경을 설계 및 구현하여 선행 연구된 기술들과 비교 분석하였다. 실험결과, 기존 연구인 LEACH와 VLEACH에 비해 재전송 비율이 4%, 생존 시간이 15%의 성능 향상이 있었음을 확인할 수 있었다. The battery life of the sensor nodes which is the most important element on Wireless Sensor Networks should be extended to perform the works as long time. There are many previous researches using residual energy or distance information based on Cluster-Architecture to manage the energy efficiently, and most of the previous researches demonstrated their idea by the simulations. However, in the real radio environment, the additional energy consumptions may be generated by data retransmission when data loss occurred. In this paper, in order to prevent the additional energy consumption, we proposed the energy-efficient cluster head election mechanism using two parameters such as the residual energy and the link quality which considered real environment. We implemented the wireless sensor network test bed based on Dash7 and compared the proposed idea with other advanced researches by the experiment. The experiment result show that our proposed method leads to the improvement in terms of retransmission rate 4%, network life time 15% compared with the previous researches such as LEACH, VLEACH.
국내 하이패스의 이용률과 보급률 및 보유차량의 중장기 수요예측 : 확산모형과 일본사례를 중심으로
김태구 ( Tae Gu Kim ),홍정식 ( Jung Sik Hong ) 한국경영공학회 2014 한국경영공학회지 Vol.19 No.1
Hi-Pass, an electronic toll collection system in Korea has experienced constant growth for 13 years since its introduction. Though various studies has been undertaken on the characteristic and user behavior of Hi-Pass service, predicting its future trend has been rarely attempted. This paper focuses on the mid-to long term forecasting based on Bass diffusion model. To overcome the limitation of nonlinear least squares method relying solely on actual data series and gain reasonable forecasts based on various scenarios, we adopt the restricted nonlinear least squares method referring to Japanese market. Forecasts resulted from the analysis are expected to provide valuable guidelines for decision makers.
쇠바위종다리(가칭) Prunella rubida의 관찰 보고
김태구(Tae-Gu Kim),최유성(Yu-Seong Choi),강승구(Seung-Gu Kang),허위행(Wee-Haeng Hur) 한국조류학회II 2012 한국조류학회지 Vol.19 No.4
2009년 4월 9일 오후 2시경 쇠바위종다리(가칭) Prunella rubida 1개체가 경상북도 경주시 건천읍 단석산 계곡(E 129° 04′ 31.04″, N 35° 47′ 49.17″)에서 관찰되었다. 본 종은 부산 다대포에서 2001년 3월 3일 1개체가 관찰되었다는 정보가 있었으나, 확실한 근거 부족으로 한국조류목록에서는 제외되었으며(한국조류학회 2009), 본 기록이 구체적인 근거자료가 있는 최초의 공식기록으로 사료되어 보고하고자 한다. On 9 April, 2009, An individual of Japanese Accentor Prunella rubida was observed at Danseoksan (E 129° 04′ 31.04″, N 35° 47′ 49.17″) in Geoncheoneup, Gyeongju, Gyeongsangbukdo. This is the first record with corroborative information in Korea.
AHP를 활용한 철도교통 분야 R&D 실용화 촉진점검 체크리스트 개발
김태구 ( Kim Tae-gu ),김동희 ( Kim Dong-hee ),이덕주 ( Lee Doek-joo ),김경택 ( Kim Kyung-taek ),문새다슬 ( Moon Saedasul ) 한국경영공학회 2017 한국경영공학회지 Vol.22 No.1
R&D projects for railway transportation in Korea have public nature and have been planned and motivated by government. Though a variety of previous studies on this topic covered different issues such as performance evaluation and policy suggestion, there is vacancy in methodologies to manage ongoing R&D projects for successful commercialization. In this study, a checklist to promote commercialization of R&D for Railway transportation and a procedure for its application are proposed. We developed the extant checklist by analyzing and restructuring it and utilized AHP to obtain weights for each checklist item and each stage of commercialization. The proposed checklist and its application procedure are expected to contribute to review and management of ongoing R&D projects.
농촌마을종합개발사업의 협력적 계획과정과 계획효과의 영향구조 분석
김태구 ( Tae Gu Kim ),이성근 ( Seong Keun Lee ) 한국농촌계획학회 2014 농촌계획 Vol.20 No.2
This study aims to analyze the affecting factors-construction of collaborative planning process and effect on Comprehensive Rural Village Development Project. To this end, targeting the 36 districts which were selected for 2004 Comprehensive Rural Village Development Project and completed their 2010 5-year projects, components of collaborative planning process and planning effect will be drawn and the affecting factors-construction of collaborative planning and effect on Comprehensive Rural Village Development Project will be analyzed below. According to the results of this study, the affecting factors of collaborative planning process of Comprehensive Rural Village Development Project on planning effect, The level of effect of individual component on endogenous variable appeared greatest mostly in the upper groups. In terms of the level of individual component effect, social learning process and interaction among participants affected greatest. The process of Comprehensive Rural Village Development Project is evaluated that it reflected collaborative planning theory of Healey enough. Therefore, in the course of Comprehensive Rural Village Development Project progress, collaborative planning model must pass social learning process and interaction among participants which are the most important components out of collaborative planning process as we saw in the upper groups. And in order to maximize the performance and results of Comprehensive Rural Village Development Project, the following sequential affecting factors model as Figure 7 must be suggested as optimal collaborative planning models of Comprehensive Rural Village Development Project. Based on the results of the study, the policy implication was drawn as follows. First, systematic supplementations in the form of a consultative body are required to perform Comprehensive Rural Village Development Project efficiently. Second, network needs to be built among different participants in Comprehensive Rural Village Development Project process. Third, systematic mechanism is required to improve social learning among different participants. Fourth, systematic rearrangement is required to guarantee the residents` realistic participation in the course of Comprehensive Rural Village Development Project process.