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.

목조문화재 보존을 위한 소방시설에 대한 고찰

김태구,Kim, Tae-Goo 국립문화재연구소 2010 保存科學硏究 Vol.31 No.-

Wooden cultural heritages have many factors of fires and structural characteristics vulnerable to the fire extinguishing. Also, they are surrounded with forests and so remote from fire stations, which make it difficult to handle it quickly when fires break out. Wooden cultural heritages made of wood materials belong to the general fire in a Class A. Taking characteristics such as a smoldering and a backfire from the that fire of wooden materials into consideration, extinguishing the fire by the cooling system is the most effective. If the fire can't be put out at the early stage, it is almost impossible to protect wooden cultural heritages from the fire, because wooden structures can be destroyed in a high temperature and in a short time and it takes around average 7 minutes to reach its peak of flames in the process of a fire. According to the geographical and environmental situation of the cultural heritages, currently, the fire-prevention facilities such as the auto fire detector for the prompt detection, the water mist fire suppression system for the 1st early and urgent fire suppression and the outdoor fire hydrant and the water curtain etc. for the 2nd full-scale suppression and the prevention of the fire gaining force are being installed for the wooden cultural heritages.

FASCAM을 이용한 적 진지 지역 화력 억제 분석 절차 연구

김태구,서성철,정경원,Kim, Taegu,Suh, Sungchul,Jung, Gyungwon 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.6

FASCAM is a newly introduced mean against enemy fire power and supposed to be scattered on base areas in front of a tunnel so as to deter maneuver and shooting of enemy artilleries. However, for its characteristics different from conventional munitions, only a few studies have been undertaken on operations system using this new measure. In this research, we propose a procedure to describe and analyze mathematically an operation system for suppression of enemy fire power using FASCAM. Two suggested simulation methods, impact point generation and density integration, both can describe the actual operation rationally and each has advantages of its own respectively. Further, we demonstrated an example analysis to derive an optimal suppression plan based on the proposed procedure.

김정은 체제의 당ㆍ군 관계 변화

김태구(Kim Tae-Ku) 북한학회 2013 북한학보 Vol.38 No.1

이 글에서는 김정은이 안정적인 정권교체를 이루어 내기 위하여 당군관계를 활용하였다고 가정하고 있다. 북한의 당군 관계에 대한 연구는 단순히 북한의 정치상황 뿐 아니라 지도자의 정권 운영 방향을 예측할 수 있다는 점에서 중요한 요소로 자리매김하고 있다. 이러한 북한의 당군 관계를 분석하는 방법에는 여러 가지가 있겠지만 이 논문에서는 특히 당ㆍ군 소속의 주요 인물들을 중심으로 살펴보고 있다. 김정일은 동구권의 몰락, 경제난과 사회적 동요 등의 대내외적 위기를 군에 의지하여 극복하고자 하였다. 당시 고난의 행군으로 불렸던 식량난은 체제를 위협하였고 김정일에게 가장 절실한 문제는 체제의 존속과 후계권력을 공고히 하는 것으로서 이를 위해 군대의 물리력을 절대적으로 필요로 하였다. 김정일이 대내외적 위기 상황을 극복하기 위하여 추진한 선군정치는 군의 정치적 위상과 영향력의 증대로 인해 상대적으로 당의 위축을 가져 왔다. 그러나 김정은은 군부의 세력을 감소시키면서 당의 위상을 높여주는 등 당-군 관계의 변화를 활용하며 안정적인 정권 교체를 이루고 체제를 공고화 하고 있다. 북한은 3, 4차 당대표자회를 통해 정권안정화를 위한 토대를 마련하였고 당의 조직을 정비하였다. 또한 군사적으로 과거 국방위원회의 기능과 권한이 조선로동당 중앙군사위원회로 이양되고 있는 조치들이 가시화 되고 있다. 이와 함께 김정은은 군부 세력을 교체하거나 강등과 복권 등의 인사조치를 반복하면서 군부를 장악하고 세력견제를 통해 안정적으로 체제를 유지하고자 하는 노력을 가속화하고 있다. 군부에 대한 강도 높은 문책은 군부의 기강을 확립하고 군부를 안정적으로 장악하기 위해 실시하는 것으로 보인다. 김정은은 이 같은 확고부동한 군부 통제력을 기반으로 당에 힘을 실어주면서 당에 의한 안정적인 국정운영 체제를 확립하고 있는 것 같다. 또한 김정은이 추진하고 있는 ‘강등 후 복권’ 방식도 팽창되어 있는 군부의 세력을 견제하고 자신에게 충성을 유도하는 전략을 구사하고 있는 것으로 볼 수 있다. This essay assumes that Kim Jeong Un has used the Party-Military relation in order to accomplish a stable transition of the regime. A research on the nK' s Party-Military relation is significant as it not only provides an insight on its political structure, but also on the leadership's direction of his management. There can be several methods for analysing nK Party-Military relations, however this particular essay focuses on the analysis through influential military elites within the nK' s political party and military branches. Kim Jeong Il, with the collapse of Soviet Union and its comrades, economic crisis, and instability of his society, has intended to overcome nK' s internal and external cnses through the fortification of its military. Furthermore, in the face of extreme food shortage, posing a vivid threat to his regime's very existence, Kim Jeong Il desperately needed a physical strength of the military to secure his regime's survival and that of his successor. The 'military-first policy' developed by Kim Jeong Il's greed to hold his regime, has strengthened the military's influence over political arena, and weakened the Party. However, Kim Jeong Un, unlike his father, is shrinking the influence of military and granting the Party with more power and influence. Through this manipulation of Party-Military relation, Kim Jeong Un is gradually stabilizing his newly established regime. Through the 3rd and 4th Conference of party delegates, Kim Jeong Un has reinforced the foundation of his regime and shifted the structure of his Party accordingly. Moreover, in the military sense, major functions and authorities, which once lied with National Defense Commission, have now been transferred to the Central Military Committee of the nKorea Workers' Party. Along such changes, Kim Jeong Un has newly appointed number of important military positions, and repeatedly demoted and promoted the pre-existing military generals to eliminate potential threats to guarantee a safe path for his emerging regime. This fierce discipline by Kim Jeong Un is being implemented in order to reorganize the fundamental principles of military branch, and safely claim his control at the same time. KJU's firm grip of the military, which allows the Party for expansion of its authority, can be seen as his attempt to prevent dysfunctions within the governments, and thus stably maintain the regime. Also, his strategic 'demotion and promotions' of high ranking officers in the military is an another method of control the military, and inducing his military elite to promise everlasting loyalty to the young leader.

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.

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.

사회 연결망 분석을 이용한 국내 영화 시장의 특성 연구

김태구(Tae-Gu Kim),조남욱(Nam-Wook Cho),홍정식(Jung-Sik Hong) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.6

최근 한국 영화시장은 높은 성장률을 거듭하면서 그 영향력을 해외로 넓히고 있다. 그에 따라 다양한 학문 영역에서 영화시장의 특성을 분석하기 위한 시도가 이루어져 왔다. 본 연구에서는 영화 간의 유사성과 관련성을 기반으로 한 사회 연결망 분석을 통해 국내 시장에서 개봉된 영화들을 몇 개의 군집으로 나누어 그 특성을 분석하였다. 장르, 등급, 배급사, 국적, 규모, 수익성 등의 여러 특성을 활용하여 얻은 연결망은 몇 개의 군집으로 나뉘며, 각각의 군집에 대하여 군집을 규정지을 수 있는 대표적인 특성과 군집 별 대표로 선정된 영화들의 특성을 살펴보았다. 분석결과 장르에 비해 상영등급과 국적이 전체 영화시장을 각각의 군집으로 나누는 중요한 기준인 것으로 나타났으며, 영화의 수익성에 있어서도 군집 간 차이가 두드러졌다. 더 나아가 확산 모형의 추정 결과는 영화의 성공과 입소문 효과의 연관성을 보여주고 있으며, 상대적으로 성공을 거두지 못한 영화들의 경우에는 높은 초기수요와 빠른 최대 시점을 갖는 단조 감소의 확산 패턴을 가지는 것으로 나타났다. Recently Korean film industry has continuously experienced a rapid growth and expanded its influence to foreign countries. Accordingly, there have been numerous studies in various research areas to investigate the characteristics of the industry. In this study, we applied social network analysis based on the attributes such as genres, ratings, distributors, nationalities, sizes, and profitability to divide the movies into several clusters with respect to their similarity. Results suggested that the ratings and nationality rather than the genre are the major factors to divide the motion picture market into clusters and the profitability also varies much across the clusters. Furthermore, estimation of the diffusion model showed the positive relationship between the success of a movie and the word-of-mouth effect, while the relatively unsuccessful titles exhibited a monotonic decreasing diffusion pattern with the high initial demand and the early peak time.

호텔직원의 핵심자기평가, 지각된 고객언어폭력 및 이직의도 간의 구조적 관계

김태구(Tae Goo Kim),이계희(Gye Hee Lee) 한국조리학회 2012 한국조리학회지 Vol.18 No.4

The purpose of this study is to investigate the structural relationships among frontline hotel employees` core-self evaluations (self-esteem, generalized self-evaluations, locus of control, and emotional stability) as personal resources, customer verbal aggression as a job stressor, and turnover intention as a job outcome. Data were gathered from a sample of frontline employees of 10 five-star hotels in Busan via self-administered questionnaires. A total number of 405 questionnaires were utilized. This study used structural equation modeling to verify the research model and hypotheses. As hypothesized, the results demonstrated that core-self evaluations reduced customer verbal aggression and turnover intention, and customer verbal aggression amplified turnover intention. Finally, practical implications were discussed in detail and limitations of the study and future research directions were also suggested.

호텔의 서비스 회복에 대한 공정성 지각과 고객만족에 관한 탐색적 연구

김태구(Tae Goo Kim),김영수(Young Soo Kim) 한국호텔외식관광경영학회 2002 호텔경영학연구 Vol.11 No.1

The purpose of this study is to analyze customer satisfaction as well as the types of justice(procedural, interactional, distributive) customers perceived in the process and result that the hotel recovers service to prevent customer defection and negative word-of-mouth in case that service failure occurs. Especially, this study was intended to make an empirical analysis of how far the individual type of this perceived justice had an effect on customer satisfaction coming from the service recovery of the hotel, based on the scenario. The summery and implications are follows: First, it was found that most of the customers experienced in presenting complaints because of the service failure at the time of using the hotel restaurant used the same hotel repeatedly. Second, an attempt was made to analyze whether the customer`s perceived justice of service recovery by the hotel had an effect on customer satisfaction. As a result, it was found that distributive justice had the greatest effect on customer satisfaction with service recovery by the hotel.

RTOS를 이용한 MPC8260 하드웨어 환경에서 교육용 라우터 개발

김태구 ( Tae-gu Kim ),정중수 ( Joong-soo Chung ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1

본 논문에서는 MPC8260 프로세서를 활용한 임베디드 시스템을 활용하여 교육용 라우터 개발을 수행하였다. 개발환경으로는 다양한 RTOS중 토네이도 2.0.2를 활용한 가장 안전한 vxworks를 사용하였다. 이때 호스트 컴퓨터를 서버로, MPC8260 프로세서를 활용한 임베디드 시스템을 클라이언트로 사용하여 서버/클라이언트간에는 RS-232-C로는 MPC8260 프로세서가 탑재된 보드의 상태 점검용으로 활용되고, 이더넷으로는 서버에서 클라이언트로 tfp로 컴파일된 소스의 다운로딩 및 이더넷 상의 패킷 송, 수신시 기능점검을 위해서 사용되었다.