Green Luminescence and Excite State Thermalization in Er-doped Gallium Nitride

JaeTae Seo,U. H. H¨ommerich,A. J. Steckl,B. R. Birkhahn,J. M. Zavada 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3

The optical properties in the 2H11/2 and 4S3/2 to 4I15/2 channels of Er-doped GaN have been investigated. The GaN:Er was grown on Si substrates by solid-source molecular beam epitaxy. The resulting Er concentration was 2 × 1020 cm−3, and the unintentional oxygen impurity was observed to be 1020 cm−3. Optical spectroscopy revealed that the lifetime decay at the 4S3/2 state was mainly due to a strong thermalization between the 2H11/2 and the 4S3/2 states. The green luminescence (4S3/2 and 2H11/2 ! 4I15/2) eciency at 300 K was much higher than 56 %. Photoluminescence and lifetime measurements with different excitation channels suggest the existence of multiple Er-sites in GaN.

Large Optical Nonlinearity of Highly Porous Silica Nanoaerogels in the Nanosecond Time Domain

JaeTae Seo,A. Jackson,B. Tabibi,H. Brown,K. Lee,K. P. Yoo,L. Creekmore,M. Namkung,Q. Yang,R. Battle,S. M. Ma,S. S. Jung,S. Y. Kim,T. Skyles 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6

The nonlinear optical properties of highly porous silica nanoaerogels with a 0.1 g/cm3 apparent density were investigated using a spatially Gaussian shaped, 8 ns pulsed laser operating at a wavelength of 532 nm with a repetition rate of 10 Hz. Closed Z-scan spectroscopy revealed the negative nonlinearity (or defocusing effect) of the silica nanoaerogels. The third-order nonlinear susceptibility of silica nanoaerogels was estimated to be 9.6 × 10.19 m2/V2 (6.9 × 10.11 esu) from degenerate four-wave mixing measurements. The nonlinear transmittance limiting threshold of silica nanoaerogels was 17 MW/cm2.F

손해사정회사 종업원의 직장만족 결정요인 연구

Jaetae Kim,kyungjin Yoo,Youngjin Choi,Jongwon Kim 한국재난정보학회 2015 한국재난정보학회 논문집 Vol.11 No.2

태풍 등 재난발생 시에 손해액을 평가하는 손해사정회사 종업원들의 직장만족은 손해평가 업무에 영향을 미치며 종국적으로는 피해자의 보상만족에 영향에 미치게 된다. 따라서 종 업원의 직장만족은 재난피해자의 보상만족에 영향을 미치는 요인 중 하나이다. 본 연구는 손해사정회사 종업원의 직장만족 결정요인에 대한 실증연구로 연구결과는 종 업원들의 심리차원의 요인, 조직차원의 요인 및 개인차원의 요인이 종업원들의 직장만족에 통계적으로 유의하게 영향을 미치는 것으로 나타났다. 그중에서 심리차원의 요인이 가장 크게 영향을 미치고, 다음으로 조직차원의 요인과 개인차원의 요인이 비슷한 크기로 영향 을 미치는 것으로 나타났다. 인지차원의 요인은 종업원의 직장만족에 통계적으로 유의하지 않은 것으로 나타났다. 손해사정회사들은 종업원직장만족의 향상을 위하여 이러한 연구결 과를 활용할 수 있을 것이다. Employee’s workplace satisfaction of claim adjusting company, who assesses the loss of catastrophe, have a direct influence on the loss evaluation job. Eventually their satisfaction would affect the compensation satisfaction of victims, therefore it is one of important factors for victims’s compensation satisfaction. This paper analyzes empirically the determinants of employee‘s satisfaction to their firm for a claim adjusting company. As a result of the empirical research, it is found that the statistically significant determinant are the psychological factor, the organizational factor, and the individual factor. Among the significant factors, the psychological factor has the biggest positive factor. And the organizational factor and the individual factor is next with similar positive measurement. But the cognitive factor is not statistically significant. A claim adjusting company may use the research result for the improvement of employee’s workplace satisfaction.

Time-resolved and temperature-dependent photoluminescence of ternary and quaternary nanocrystals of CuInS₂ with ZnS capping and cation exchange

Seo, Jaetae,Raut, Sangram,Abdel-Fattah, Mahmoud,Rice, Quinton,Tabibi, Bagher,Rich, Ryan,Fudala, Rafal,Gryczynski, Ignacy,Gryczynski, Zygmunt,Kim, Wan-Joong,Jung, Sungsoo,Hyun, Ruh American Institute of Physics 2013 JOURNAL OF APPLIED PHYSICS - Vol.114 No.9

손해사정회사 종업원의 직장만족 결정요인 연구

Kim, Jaetae,Yoo, kyungjin,Choi, Youngjin,Kim, Jongwon 한국재난정보학회 2015 한국재난정보학회 논문집 Vol.11 No.2

태풍 등 재난발생 시에 손해액을 평가하는 손해사정회사 종업원들의 직장만족은 손해평가업무에 영향을 미치며 종국적으로는 피해자의 보상만족에 영향에 미치게 된다. 따라서 종업원의 직장만족은 재난피해자의 보상만족에 영향을 미치는 요인 중 하나이다. 본 연구는 손해사정회사 종업원의 직장만족 결정요인에 대한 실증연구로 연구결과는 종업원들의 심리차원의 요인, 조직차원의 요인 및 개인차원의 요인이 종업원들의 직장만족에 통계적으로 유의하게 영향을 미치는 것으로 나타났다. 그중에서 심리차원의 요인이 가장 크게 영향을 미치고, 다음으로 조직차원의 요인과 개인차원의 요인이 비슷한 크기로 영향을 미치는 것으로 나타났다. 인지차원의 요인은 종업원의 직장만족에 통계적으로 유의하지 않은 것으로 나타났다. 손해사정회사들은 종업원직장만족의 향상을 위하여 이러한 연구결과를 활용할 수 있을 것이다. Employee's workplace satisfaction of claim adjusting company, who assesses the loss of catastrophe, have a direct influence on the loss evaluation job. Eventually their satisfaction would affect the compensation satisfaction of victims, therefore it is one of important factors for victims's compensation satisfaction. This paper analyzes empirically the determinants of employee's satisfaction to their firm for a claim adjusting company. As a result of the empirical research, it is found that the statistically significant determinant are the psychological factor, the organizational factor, and the individual factor. Among the significant factors, the psychological factor has the biggest positive factor. And the organizational factor and the individual factor is next with similar positive measurement. But the cognitive factor is not statistically significant. A claim adjusting company may use the research result for the improvement of employee's workplace satisfaction.

부동산 중개사무소 서비스가 고객그룹별 신뢰에 미치는 영향 연구

김재태(Jaetae Kim),설영미(Yeongmi Seul),김종원(Jongwon Kim) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.12

본 연구는 부동산 중개소가 제공하는 서비스요인인 물리적시설, 고객지향성, 정보제공, 유대 등 4개 요인이 고객의 부동산 중개소 대한 신뢰에 미치는 영향을 연구하였다. 연구결과는 연구대상 전체 고객집단, 남녀별 그룹 및 연령대별 그룹 등 총 7개 고객 그룹 모두에서 부동산 중개소가 제공하는 유대 서비스 요인이 고객에 부동산 중개소에 가지는 신뢰에 통계적으로 유의하게 영향을 미치고 그 영향도가 가장 큰 것으로 나타났다. 기타 서비스 요인은 고객유형별로 차이를 보였다. 이렇게 유대가 부동산 중개소에 대한 신뢰에 중요하게 영향을 미치는 이유는 부동산의 매매 또는 임대가 거래금액규모가 크고, 고객의 자산에 매우 중요하며, 법적으로 복잡하고 어려운 사항이 관련되고, 그리고 거래의 영향이 장기에 미침으로 인하여 의사결정이 어려워서 고객은 여러 서비스 요인 중 유대를 바탕으로 부동산 중개소를 찾고 있기 때문으로 생각된다. 따라서 부동산 중개소는 고객의 신뢰를 확보하기 위여 유대를 강화할 수 있는 친절과 예의, 편안함 향상 등 유대중심의 고객 마케팅을 중점적으로 추진하고, 기타 서비스요인은 고객그룹유형에 따라 적절하게 보완적으로 추진하는 것이 바람직할 것으로 생각된다. This research analyzes the effect of the service factors(bonds with customers, customer orientation, information, and physical environment) referred to the licensed real estate agent on the customer trust by costumer patterns based on the sex and ages. This study is based on metropolitan customers, who have had the experiences on real estate transaction through the licensed real estate agent over the past three years, by questionnaire. We found that the bonds between customers and licensed real estate agent has statistically significant and big influence on the all groups of costumer pattern such as the entire customer group, men and women groups, and thirties to sixties age groups(4 groups). And the other service factors have various significant depending on the customer patterns. According to the result of this paper, for more efficient customer marketing, the licensed real estate agent may focus on the ties with customer to the all kinds of customer group, and use the other service factors depending on the customer group patterns.

자유학기제 관련 쟁점 및 운영의 실제 현황

강재태 ( Kang Jaetae ),유영주 ( Yoo Youngju ) 경상대학교 중등교육연구소 2017 현대교육연구 Vol.29 No.-

내년부터 전국의 절반 정도의 중학교에서 자유학기제에서 진일보한 자유학년제가 실시된다. 지난 5년간 자유학기제를 운영한 결과 좋은 점도 많았지만 개선하고 바람직한 방향으로 가야할 일 또한 산적해 있다. 이에 자유학기제의 쟁점, 과제들을 알아보고, 자유학기제의 운영현황을 검토해 봄으로써, 자유학년제의 안정적 정착에 필요한 기초자료를 제시할 필요가 있다. 이 연구의 주요 결과는 다음과 같다. 첫째, 자유학기제는 아직 준비되지 않은 제도이다. 일단 학생들이 진로체험을 할 수 있는 곳이 한정되어 있으며, 진로프로그램 역시 다양하지 못하다. 또한 입시제도가 바꾸지 않은 현 상황에서 여러 활동들이 입시로부터 자유롭지 못하다는 등의 문제를 지니고 있다. 둘째, 교육부에서는 일선 학교에 자유학기제와 관련하여 상당 부분 자율적 운영권을 주었다고 하나, 일선학교에서의 교육과정이나 자율과정 등의 운영현황이 큰 차이가 없었다. 이는 기존의 관행적 방식에서 크게 벗어나고 싶지 않은 교사들과 학력저하에 불안을 가지고 있는 학부모의 이해가 타협되는 수준에서 운영되고 있었기 때문이라고 할 수 있다. 그 결과 다음과 같은 결론을 내릴 수 있다. 자유학기제의 장점은 분명하다. 꼭 필요한 제도라는 것도 확실하다. 대부분의 중학교 구성원들은 자유학기제를 원한다. 그러나 확대시행에 대해서는 회의적이다. 고등학교 경쟁입시제도 존재하며, 학교의 인식도 부족하다. 체험 인프라도 미흡하고, 학생중심·과정중심의 수업을 이끌 수 있는 교사양성도 아직 덜됐다. 교과서도 창의적인 아이를 육성할 수 있도록 대대적으로 개편해야 한다. The past five years of ‘free-semester’ has resulted in many good things, but there is a lot of work to be done to improve and move toward the right direction. Therefore, it is necessary to present basic materials necessary for the stable settlement of the free-learning system by examining the issues and tasks of the free-term system and reviewing the operation status of the free-term system. The main results of this study are : First, the free school term system is not ready yet. Once students can experience paths, the programs are limited. There are also problems such as the lack of freedom of entrance to various kinds of activities in the current situation when the admission system has not changed. Second, the Ministry of Education gave schools a considerable amount of autonomy over the free-learning system, but the current status of education or the operation of courses in schools was not significantly different. This could be attributed to the fact that teachers who did not want to deviate much from the traditional practice and parents who were anxious about academic background degradation were operating at a compromise. As a result, the following conclusions can be concluded : The merit of the free-learning offer is clear. It is also clear that it is a necessary map. Most middle school members want a free semester. However, they are skeptical of the expansion. High school competitive entrance system exists, and school recognition is insufficient. The experience infrastructure is not enough, and there is not enough teachers training to lead the student-centered and process-centered classes. In addition, textbooks should be drastically reformed to foster creative children.

A Study on the Decision Factors and Satisfaction of SMEs

Yongsang PARK(Yongsang PARK),Jaetae KIM(Jaetae KIM) 국제융합경영학회 2023 융합경영연구 Vol.11 No.3

Purpose: The purpose of this study is to identify the determinants of store occupancy based on the rental characteristics of small and medium-sized enterprises (SMEs) renting buildings across the country, and to analyze the satisfaction level after opening. Research design, data and methodology: The study conducted an empirical survey through questionnaires targeting individual business owners, corporate representatives, and executives and employees nationwide, including Seoul, Gyeonggi, and other metropolitan areas and provincial cities. Results: In this study, the most important factor that SMEs consider when deciding whether to rent a commercial building or office is financial characteristics, followed by management characteristics, location characteristics, building characteristics, and facility characteristics. In addition, management characteristics were found to have the greatest impact on rental satisfaction of SMEs, followed by financial characteristics, building characteristics, and location characteristics in order. Conclusions: Since the lessor cannot immediately improve the location characteristics or building characteristics, in order to increase the rental satisfaction of small and medium-sized businesses in a relatively short period of time, it is necessary to improve managerial characteristics such as prompt civil complaint handling and clean management of the building. In addition, it is analyzed that if the factors that can reduce the burden on the tenants are found in advance and reflected in the financial characteristics, the satisfaction of the tenants can be increased.

K^+통로개방제 Pinacidil이 종양이식 생쥐에서 Tl-201의 체내분포에 미치는 영향

이재태,천경아,이상우,강도영,안병철,전수한,이규보,하정희 경북대학교 의학연구소 1999 경북대학교병원의학연구소논문집 Vol.3 No.1

Purpose: Thallium behaves similarly to potassium in vivo. Potassium channel opener (K-opener) opens ATP-sensitive K+ -channel located at cell membrane, resulting in potassium efflux from cytosol. We have previously reported that K-opener can alter biokinetics of T1-201 in cultured cells and in vivo. Malignant tumor cells have high Na-K ATPase activity due to increased metabolic activities and dedifferentiation, and differential delineation of malignant tumor can be possible with T1-201 imaging K-opener may affect tumoral uptake of T1-201 in vivo. To investigate the effects of pinacidil (one of the potent K-openers) on the localization of the tumor with T1-201 chloride, we evaluated the changes in biodistribution of T1-201 with pinacidil treatment in tumor-bearing mice. Materials and Methods: Balb/c mice received subcuta-neous implantation of murine breast cancer cells in the thigh and were used for biodistribution study 3 weeks later. 100㎍ of pinacidil dissolved in 200 □ DMSO/PBS solution was injected intravenously via tail vein at 10 min after 185 KBq (5 □Ci) T1-201 injection, Percentage organ uptake and whole body retention ratio of T1-201 were measured at various periods after injection, and values were compared between control and pinacidil-treated mice. Results: Pinacidil treatment resulted in mild decrease in blood levels of T1-201, but renal uptakes were markedly decreased at 30-min, 1- and 2-hour, compared to control group. Hepatic, intestinal and muscular uptake were not different. Absolute percentage uptake and tumor to blood ratios of T1-201 were lower in pinacidil treated mice than in the control group at all time points measured. Whole body retention ratio of T1-201 was lower in pinacidil treated mice (58±4%), than in the control group (67±3%) at 24 hours after with injection of 100 □g pinacidil. Conclusion: K-opener did not enhance, but rather decreased absolute tumoral uptake and tumor-to-blood ratios of T1-201 Decreased whole body retention ratio and renal uptake were observed with pinacidil treatment in tumor-bearing mice. (Korean J Nucl Med 2000;34:303-11)

Site-Specific 99mTc-Labeling of Antibody Using Dihydrazinophthalazine (DHZ) Conjugation to Fc Region of Heavy Chain

정재민,Jaetae Lee,Chang Hum Paik,Dae-Kee Kim,Dong Soo Lee,정준기,Myung Chul Lee 대한약학회 2004 Archives of Pharmacal Research Vol.27 No.9

The development of an antibody labeling method with 99mTc is important for cancer imaging. Most bifunctional chelate methods for 99mTc labeling of antibody incorporate a 99mTc chelator through a linkage to lysine residue. In the present study, a novel site-specific 99mTc labeling method at carbohydrate side chain in the Fc region of 2 antibodies (T101 and rabbit antihuman serum albumin antibody (RPAb)) using dihydrazinophthalazine (DHZ) which has 2 hydrazino groups was developed. The antibodies were oxidized with sodium periodate to produce aldehyde on the Fc region. Then, one hydrazine group of DHZ was conjugated with an aldehyde group of antibody through the formation of a hydrazone. The other hydrazine group was used for labeling with 99mTc. The number of conjugated DHZ was 1.7 per antibody. 99mTc labeling efficiency was 46~85% for T101 and 67~87% for RPAb. Indirect labeling with DHZ conjugated antibodies showed higher stability than direct labeling with reduced antibodies. High immunoreactivities were conserved for both indirectly and directly labeled antibodies. A biodistribution study found high blood activity related to directly labeled T101 at early time point as well as low liver activity due to indirectly labeled T101 at later time point. However, these findings do not affect practical use. No significantly different biodistribution was observed in the other organs. The research concluded that DHZ can be used as a site-specific bifunctional chelating agent for labeling antibody with 99mTc. Moreover, 99mTc labeled antibody via DHZ was found to have excellent chemical and biological properties for nuclear medicine imaging.