Eu³⁺와 Tb³⁺ 활성제 이온이 SrSnO₃ 형광체의 특성에 미치는 영향

김정대,조신호,Kim, Jung Dae,Cho, Shinho 한국재료학회 2014 한국재료학회지 Vol.24 No.9

$SrSnO_3$ phosphor powders were synthesized with two different contents of activator ions $Eu^{3+}$ and $Tb^{3+}$ using the solid-state reaction method. The structural, morphological, and optical properties of the phosphors were investigated using X-ray diffractometry, field-emission scanning electron microscopy, and fluorescence spectrophotometry, respectively. All the phosphors showed a cubic structure, irrespective of the type and the content ratio of activator ions. For $Eu^{3+}$-doped $SrSnO_3$ phosphors, the intensity of the 620 nm red emission spectrum resulting from the $^5D_0{\rightarrow}^7F_2$ transition of $Eu^{3+}$ was stronger than that of the 595 nm orange emission signal due to the $^5D_0{\rightarrow}^7F_1$ transition in the range 0.01-0.05 mol of $Eu^{3+}$, but the ratio of the intensity was reversed in the range 0.10-0.20 mol of $Eu^{3+}$. The variation in the emission intensity indicates that the site symmetry of the $Eu^{3+}$ ions around the host crystal was changed from non-inversion symmetry to inversion. For the $Tb^{3+}$-doped $SrSnO_3$ phosphors under excitation at 281 nm, one strong green emission band at 550 nm and several weak bands were observed. These results suggest that the optimum red and green emission signals can be realized when the activator ion content for $Eu^{3+}$- or $Tb^{3+}$-doped $SrSnO_3$ phosphors is 0.20 mol and 0.15 mol, respectively.

연구논문 : 전단산(檀山), 정병산(精兵山), 봉림산(鳳林山)의관계와 위치

김정대 ( Jung Dae Kim ) 경남대학교 가라문화연구소 2013 加羅文化 Vol.25 No.-

The mountain over Changwon University located at Sarim-dong, Uichang-gu, Changwonsi, Gyeongsangnam-do Province, was originally called ‘Jeondansan(栗營로)’. It also became called ‘Jeongbyeongsan(鍾懿로)’ in late Joseon, though we cannot ascertain the exact period. It happened at a certain period that the mountain had only one name of the latter, Jeongbyeongsan. That name has been handed down as such until now. On the other hand, ‘Bongnimsan(荏座로)’ is the name of a low mountain branched off from the west end of Jeondansan(Jeongbyeongsan) towards the south, where Changwon Country Club is now located. The above facts can be without any difficulty verified by the historic materials; representative geographical books such as 『Sinjeung Donggukyeojiseungram or A New Enlarged Edition of Korean Geography(沔마 栽閑亞합비章)』 in Joseon Dynasty, and carved stones such as the gravestone of a civil general, Gyeongjong Roh at the time of Japanese invasion, wood engravings such as 『Bongsanchodanggi or A Record of a Thatched cottage Named Bongsan(荏로醍友牙)』 made by Jaesu Roh, younger brother of Gyeongjong, and family tree records such as 『Garakwangneunggi or A Record of King`s Tomb in Garak Country(式사사력牙)』, and a Chinese Poem made by Jaejeong Kim. However, Dongbaek Park Director General of Changwon Cultural Center falsely argued that the mountain over Changwon University had been originally called Bongnimsan and Jeongbyeongsan had been given by the Japanese authorities during the Japanese colonial era, and Jeondansan was the present Daeamsan in Changwon. We cannot know this preposterous remarks against the evident truth. His false arguments unfortunately deceived lots of people. In this context the author criticized his fictitious arguments in a series papers, insisting that the twisting history should never be accepted. The two different points caught the public eye and attracted the attentions of local media. As an example of this mood an article in favor of my opinion on the ground of the professional opinions in the academic and cultural circle and the witnesses of native people, showed up in the th page of《Gyeongnam Sinmun or Gyeongnam Daily Mail》on June ;, ;0`.In the last step, the author would like to add the remark that this was revised version to criticize Park`s argument in detail parts and to elucidate how fictitious his argument was.

Eu³⁺ 이온의 몰 비 변화에 따른 MgMoO₄:Dy³⁺,Eu³⁺ 형광체의 광학 특성

김정대,조신호,Kim, Jung Dae,Cho, Shinho 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.3

The effects of $Eu^{3+}$ doping on the structural, morphological, and optical properties of $MgMoO_4:Dy^{3+},Eu^{3+}$ phosphors prepared by solid-state reaction technique were investigated. XRD patterns exhibited that all the synthesized phosphors showed a monoclinic system with a dominant (220) diffraction peak, irrespective of the content of $Eu^{3+}$ ions. The surface morphology of $MgMoO_4:Dy^{3+},Eu^{3+}$ phosphors was studied using scanning electron microscopy and the grains showed a tendency to agglomerate as the content of $Eu^{3+}$ ions increased. The excitation spectra of the phosphor powders were composed of a strong charge transfer band centered at 294 nm in the range of 230~340 nm and two intense peaks at 354 and 389 nm, respectively, arising from the $^6H_{15/2}{\rightarrow}^6P_{7/2}$ and $^6H_{15/2}{\rightarrow}^4M_{21/2}$ transitions of $Dy^{3+}$ ions. The emission spectra of the $Mg_{0.85}MoO_4$:10 mol% $Dy^{3+}$ phosphors without incorporating $Eu^{3+}$ ions revealed a strong yellow band centered at 573 nm resulting from the $^4F_{9/2}{\rightarrow}^6H_{13/2}$ transition of $Dy^{3+}$. As the content of $Eu^{3+}$ was increased, the intensity of the yellow emission was gradually decreased, while that of red emission band located at 614 nm began to appear, approached a maximum value at 10 mol%, and then decreased at 15 mol% of $Eu^{3+}$. These results indicated that white light emission could be achieved by controlling the contents of the $Dy^{3+}$ and $Eu^{3+}$ ions incorporated into the $MgMoO_4$ host crystal.

중소 공급업체의 SCM역량요인이 운영성과에 미치는 영향: 수요불확실성의 조절효과를 중심으로

김정대,Kim, Jung-dae 한국벤처창업학회 2017 벤처창업연구 Vol.12 No.5

일자리 창출과 국가산업경쟁력 측면에서 중소기업의 중요성이 강조되고 있다. 글로벌 환경의 불확실성과 공급사슬 간 경쟁으로의 패러다임의 변환은 공급사슬 내 중소 공급업체의 역량에 더욱 관심이 집중되고 있다. 이러한 점에서, 공급사슬상의 구매자-공급자 관계에서 중소공급업체의 SCM(공급사슬관리) 역량이 중소공급업체의 운영성과에 미치는 영향을 실증 분석하였다. 또한 환경적 요소로서 수요불확실성이 이러한 관계에 어떤 조절효과를 미칠 수 있는지 살펴보았다. 이러한 목적을 달성하기 위해 전기 전자, 금속 기계, 자동차 등의 산업에 속한 중소공급업체를 대상으로 설문조사를 실시하였으며, 구조방정식 모형을 이용하여 관련 연구가설을 검정하였다. 연구결과, 중소 공급업체의 공급사슬역량인 관계자본은 운영성과에 유의한 정(+)의 영향을 미치는 것으로 나타나고, 조정역량은 운영성과에 유의한 영향이 나타나지 않았다. 수요 불확실성의 조절효과를 살펴보면, 관계자본 역량과 운영성과 간에는 수요불확실성의 정(+)적인 조절효과가 나타난 반면, 조정역량과 운영성과 간에는 유의한 조절효과가 나타나지 않는다. 이러한 결과는 관계자본 역량은 운영성과에 긍정적인 영향을 미치며, 수요불확실성의 상황에서도 운영성과를 제고시키는 역할을 하고 있는 것을 알 수 있다. 반면에 조정역량의 경우, 구매기업과의 핵심 비즈니스 프로세스를 통합할 수 있는 정보공유, 커뮤니케이션 등의 외부적 조정역량을 향상시킬 수 있는 프로세스의 강화와 더불어 공급사슬관련 업무를 효과적으로 수행할 수 있는 중소공급업체 내부 관련부서들 간의 조정이 뒷받침되어야 한다는 점을 시사한다. This study analyzed both the effect small and medium-sized suppliers' SCM capacity on the performance and how the moderating effect of demand uncertainty as an environmental factor affects this relation. The study is based on the data collected from the survey of small and medium-sized suppliers operating in electronics, metal, machinery, automobile, and textile. It analyzed the results of survey targeting suppliers of these areas by using structure equation modeling. According to the analyzed result, the relation capital of small and medium-sized supplier affects the performance, but there is no relation between coordination capability and the performance. In case of the moderating effect of demand uncertainty, while there is a positive moderating effect of demand uncertainty between relation capital and performance, there is no any moderating effect between coordination capability and performance. It turns out that the relation capital keep having a positive effect on the performance even if there is a demand uncertainty.

영남권 섬진강변 언어의 문화 공간적 의의

김정대 ( Jung Dae Kim ) 한국문학언어학회 2012 어문론총 Vol.57 No.-

전침 자극이 쥐의 심박 변이도 변화에 미치는 영향

김정대 ( Jung Dae Kim ),김연진 ( Yun Jin Kim ),소광섭 ( Kwang Sup Soh ) 대한경락경혈학회 2007 Korean Journal of Acupuncture Vol.24 No.2

목적: 전침 자극은 최근에 임상연구와 더불어 기초연구에서 자주 사용하는 방법으로 경락이론에 의거하여 신체에 분포되어 있는 경락상의 각종경혈부위에 인위적인 전기 자극을 통하여 질병을 치료, 예방 혹은 완화하는 방법이다. 이에 본 연구에서는 정상적인 쥐의 상태에서 일정한 전침 자극을 주었을 때, 심박변이도의 변화를 측정 하였다. 방법: 쥐의 정상적인 마취상태에서 태충혈에 4 Hz와 80 Hz의 5 V 크기로 10mA 강도의 사각파 파형으로 자극을 주었으며 대조조로 비경혈 부위에 4 Hz의 동일한 파형으로 자극을 주어 심박 변이도의 변화정도를 측정하였다. 결과: 본 실험에서 RR Interval의 경우 태충혈 4 Hz 보다 80 Hz일때 RR Interval의 파형이 더 크게 나타났으며, PSD의 분석에서도 자극 전후를 비교하였을 때 1~3 Hz 사이에 높은 피크가 보였으며 4Hz의 비경혈 부위에서는 큰 변화를 보이지 않았다. 결론: 이번 실험연구를 통하여 정상적인 쥐의 상태에서 일정한 전침 자극을 주었을 때, 심박 변이도 변화를 도출할 수 있었으며, 이번 실험을 통해 비수술적인 방법으로 치료효과와 심박 변이도를 측정할 수 있었고, 이를 통해 전침자극의 기전 연구에 있어 과학적 근거를 제시할 수 있다고 사료된다.

경남 방언 친족어 연구 : 산청(山淸) 지역어 호칭어를 중심으로

김정대 ( Jung Dae Kim ) 경상대학교 배달말학회 2008 배달말 Vol.42 No.-

션트저항을 이용한 3상 인버터의 전압 변조지수 증대

김정대(Jung-Dae Kim),최종우(Jong-Woo Choi) 대한전기학회 2018 전기학회논문지 Vol.67 No.3

This paper has done a hardware-based approach to increase the modulation index in 3-phase inverters, unlike the conventional software algorithm-based approaches. The minimum required time to measure the currents in a three-phase inverters with shunt resistors has also been analyzed. By the analysis, the longest time in minimum required time is AD conversion time. To shorten the minimum required time, this paper proposed a sample-and-hold(S/H) circuit implemented at the inverter current signal output to retain the current signal. When the linear operation region of an inverter with S/H was compared with that without it, the modulation index was increased by 7.8 %. Inverters with S/H circuits can employ the traditional software algorithms, such as the voltage injection method or current restoration method, and it will yield further increase the modulation index.

공급사슬에서 중소제조기업의 관계자본과 기업가적 지향성이 운영 및 기업성과에 미치는 영향

김정대(Jung-Dae Kim),이헌철(Heon-Cheol Lee) 충남대학교 경영경제연구소 2016 경영경제연구 Vol.38 No.1

본 연구는 공급사슬에서 중소제조기업의 관계자본과 기업가적 지향성이 운영 및 기업성과에 미치는 영향을 분석하였다. 본 연구의 목적을 달성하기 위해 대구 · 경북지역에 입지하고 있는 전자, 기계, 자동차용 부품 등을 생산하는 중소제조기업을 대상으로 179부의 데이터를 수집하였다. 수집된 데이터는 통계패키지 SPSS 21.0과 AMOS 21.0을 활용하여 분석하였다. 가설검정 결과, 관계자본과 기업가적 지향성이 기업의 운영성과에 정(+)의 영향을 미치는 것으로 나타났으며 관계자본이 기업가적 지향성에 비해 영향력이 더 큰 것으로 나타났다. 그리고 운영성과는 기업성과에 정(+)의 영향을 미치는 것으로 나타났다. 관계자본과 기업가적 지향성이 운영성과에 대한 설명력은 57.9%이고 운영성과가 기업성과에 대한 설명력은 37.3%로 나타났다. 결국, 공급사슬에서의 중소제조기업은 기업가적 지향성의 활성화를 통한 주요 거래기업과의 다양한 파트너십 구축과 관계자본 역량을 향상시킬 수 있는 프로세스를 강화함으로써 기업성과를 개선할 수 있을 것이다. The purpose of this study is to verify how relational capital and entrepreneurial orientation of manufacturing SMEs affect their business performance. The study is based on the data collected from a sample of 179 manufacturing SMEs operating in electronics, machinery, and automobile manufacturing within the Daegu and Gyeongbuk areas. These collected data are analyzed through AMOS 21. It is found that relational capital and an entrepreneurial orientation have a positive correlation with operations capability and accounted for 57.9% of the variance. Also, relational capital has a greater influence on capability than entrepreneurial orientation has. Furthermore, there is a positive correlation between operations capability and business performance, which accounted for 37.3% of the variance. In conclusion, SMEs could improve business performance through forming a variety of partnerships with their business associates and strengthening their own work processes, which can improve relational capital in supply chains.

경남방언 구획 문제를 다시 생각한다

김정대 ( Jung Dae Kim ) 배달말학회 2012 배달말 Vol.51 No.-

This paper has three purposes as following: First, this is a critical reflection on J. D. Kim(2000) in which the author tried to demarcate Gyeongnam Dialect area. Second, the author is interested in the result from which new data are added to the existing methodology suggested in M. O. Choi(1994/1998). Third, the author wants to suggest what should be needed for the desirable demarcation of Gyeongnam dialect in the future. Among those three points the second is the most important one. More concrete discussions are as following: First, at the time when J. D. Kim(2000) was submitted, it lacked the optimal methodology and the effective utilization of related data, although the author ambitiously tried to approach the subject. Second, the author has an idea of the right demarcation of Gyeongnam dialect on a tentative mode: Gyeongnam dialect is primarily divided into east and west on a large scale, whose boundary is roughly related to the main stream of a river Nakdonggang. This fundamentally coincides with that suggested in M. O. Choi(1994/1998), and yet it has a difference in that the two authors differently divide Changwon regional dialect. The present author thinks of Changwon regional dialect as a transitional one with a strong trend towards eastern Gyeongnam. The western Gyeongnam dialect is divided into south and north, whose boundary is related Nangnamjeongmaek(洛南正脈, a series of mountains running towards southern orientation). This is different from that suggested in Choi(1994/1998) which divided mid-western Gyeongnam dialect into east and west again. Third, what we must solve is to develop a more rigid methodology at first, and to collect data with an emphasis on the collection in mind.