GaOOH 선구체의 스핀코팅에 의한 GaN 박막의 성장

이재범,김선태,Lee, Jae-Bum,Kim, Seon-Tai 한국재료학회 2007 한국재료학회지 Vol.17 No.1

GaN thin fan were grown by spin coated colloidal GaOOH precursor. Polycrystalline GaNs with crystalline size of $10{\sim}100nm$ were grown on $SiO_2$ substrate. The shape of crystallite above $900^{\circ}C$ had the hexagonal plate and column type. X-ray diffraction patterns for them correspond to those of the hexagonal wurtzite GaN. With increasing droplets. i.e, thickness of deposited layers, XRD intensity increased. PL (photoluminescence) spectrum consisted with an weak near band-edge emission at 3.45 eV and a broad donor-acceptor emission band at 3.32 eV. From the low temperature PL measurement on GaN grown at $800^{\circ}C$ that the shallow donor-acceptor recombination induced emission was more intense than the near band-edge excitonic emission.

AlOOH로부터 AlN분말의 합성

이재범,김선태,Lee, Jae-Bum,Kim, Seon-Tai 한국재료학회 2006 한국재료학회지 Vol.16 No.12

In this study, we report a method to synthesize the aluminum nitride (AlN) powders from aluminum oxyhydroxide (AlOOH). AlOOH powders were prepared from the aluminum hydroxide ($Al(OH)_3$) by heattreatment at the reaction temperature of $350^{\circ}C$. Simple heat treatment of AlOOH in the flow of $NH_3$ gas leads to the formation of hexagonal AlN powders through intermediate conversion of ${\delta}-,\;{\gamma}-$ and ${\alpha}-Al_2O_3$. The FTIR transmission spectra show a broad peak related to Al-N bonds centered around 690 $cm^{-1}$ confirming the presence of AlN. The major peaks in Raman spectra were observed in 250 $cm^{-1}$ and 659 $cm^{-1}$. From the results, synthesized powders from the AlOOH powders were confirmed AlN powders.

Vapor Transport Epitaxy에 의한 GaN의 성장과 특성

이재범,김선태,Lee, Jae-Bum,Kim, Seon-Tai 한국재료학회 2006 한국재료학회지 Vol.16 No.8

Highly c-axis oriented poly-crystalline GaN with a dimension of $1{\sim}3\;{\mu}m$ was deposited on $c-Al_2O_3$ substrate by vapor transport epitaxy (VTE) method at the temperature range of $900{\sim}1150^{\circ}C$. XRD intensities from (00'2) plane of grown GaNs were increased with reaction conditions which indicate the improvement of the crystal quality. In the PL spectra measured at 10 K, the spectrum composed with the neutral-donor bound exciton-related emission at 3.47 eV, crystal defect-related emission band at 3.42 eV and with its phonon replicas. The fact that intensity of $I_2$ were increased and FWHM were decreased with growth conditions means that the quality of GaN crystals were improved. With this simple VTE technology, we confirm that the GaNs were simply deposited on sapphire substrate and crystal quality related to optical properties of GaN grown by VTE were relatively good. PL emission without deep level emission in spite of polycrystalline structure can be applicable to the fabrication of large area and low cost optical devices using poly-GaN grown by VTE.

단오와 역사 인물

이재범(Jae-bum Lee) 아시아강원민속학회 2007 아시아강원민속 Vol.21 No.-

단오는 음력 5월 5일로 우리나라 4대 명절의 하나이다. 단오는 일 년 중 양기가 가장 왕성한 날이라 해서 큰 명절로 여겨왔다. 이러한 단오와 관련 있는 대표적 역사적 실존 인물은 김유신과 범일국사이다. 범일국사는 강릉에서 출생하여, 이 지역을 위하여 공헌한 인물이다. 김유신은 이 지역의 수호신으로 존경을 받고 있다. 이들 중 범일은 강릉 출신이지만, 김유신은 그렇지 않다. 그리고 김유신과 범일국사 모두 단오와는 관련이 없다. 후대에 추앙을 받은 것이다. 그런데 후삼국시대의 궁예는 단오날 출생한 인물이며 강릉과도 관련이 있다. 궁예는 자신이 왕이 되기 전까지 가장 확실한 지역 근거로써 강릉을 배경으로 한다. 궁예가 강릉에 군대를 이끌고 왔을 때 강릉에서는 궁예를 ‘入’이라고 표현한 것처럼 영입하고 있다. 궁예의 여러 정복지역에서 ‘入’ 이라고 기록된 예는 강릉이 유일하다. 그리고 궁예는 이러한 강릉지역의 호응에 힘입어 이곳에서 군대를 14대(隊)로 나누는 등 체계적인 조직화를 꾀한다. 궁예는 강릉단오제와 관련하여 새롭게 부각되어야 할 역사인물 가운데 하나라고 할 것이다. 궁예의 이미지에 대해서도 포학한 군주라는 데서 최근 긍정적인 측면을 찾아보려는 노력이 행해지고 있다. 강릉단오제의 내용을 보다 풍부하게 하기 위해서라도 이러한 고대 인물의 발굴은 의미가 있다고 하겠다. Dana, the fifth day of the fifth month of the year according to the lunar calendar, is one of the four major feast days in Korea. People say that the Yang(陽) energy is most vitally animated on this day. Concerning Dana we have at least two people in history: one is Kim Yu-Shin(김유신) and the other is the National Buddhist monk Bomil(범일). This monk was born in Kang-Neung(강릉) and he made great services to his hometown. And Kim has been and is still respected in Kang-Neung as its Guardian spirit. Unlike Bomil, Kim does not have any relationship with Kang-Neung. While neither of them is directly related to the Dana festival, Gung-Ye(궁예), in the post Three-Kingdom period, was born on the Dana day. And he is closely related to Kang-Neung. Before he became a king, Kang-Neung used to be his foundation to build up his political and military power. When he led his army into Kang-Neung, historians wrote, “Gung-Ye entered(入) the region.” The term “entered”(入) has a connotation that the residents did not have antagonism to his army. This expression of welcoming tone is significant as we can hardly find similar expressions in his conquests. By the support of this area, Gung-Ye could organize his whole army, dividing it into 14 divisions(隊). In this respect, Gung-Ye could be reevaluated, noting his connection with Kang-Neung area. In addition to his image of cruel king, some recent scholars try to find some positive features from Gung-Ye. If we could recover historically-meaningful people, such as Gung-Ye, this sort of research could contribute to realize the contents of the Kang-Neung Dana festival.

대몽항전의 성격에 대하여

이재범(Lee, Jae-Bum) 백산학회 2004 白山學報 Vol.- No.70

For about 30 years, Koryo people had been fighting against the Mongols, who infringed upon Koryo Kingdom so as to build a world-wide big empire. Until recently, Koryo’s oppositional activities to the Mongolian invaders used to be interpreted as an event for the Korean people to display their national consciousness, even though they could not avoid surrendering themselves to the Mongols. And in other respect, this losing war esteemed to be a historical and nationalistic event for the Koryo people to consolidate their national identity, uniting forces of soldiers, governmental officials, and local civilians and strenuously struggling against the foreign enemies. One thing we should remember is that lots of class-struggles can be historically proved during these Mongol opposition war period. In this paper, I have analysed several examples of these sorts of class-struggling conflicts in the Koryo society. For these reasons, I argue that it is not absolutely true that all Koryo people had been untied to fight against Mongol aggressors. Another thing especially noted in this paper is that the change of attitude among the lower class towards the war against Mongols. Around the time of Mongol invasion, lots of lower people were engaged with civilian oppositional activities. This can be said to some sort of class struggle. Meeting the foreign invaders of Mongols, socially-low class people in Koryo changed their attitude the local powerful families, such as the Choe’s. With this result, powerful family could be cooperative with the lower class people. This change shows that lower people put the highest point to the protection of their local community against foreign powers. With these two major acpects, the struggle of Koryo people against the Mongols should be understood as a community-protection efforts, jointly carried out by Koryo people, mainly composed of governmental officials and local residents of lower class.

ZVS Center-Tapped Half-Bridge Zeta Converter with Reduced Output Filter Inductor Size

Jae-Bum Lee(이재범),Ki-Bum Park(박기범),Hyoung-Suk Kim(김형석),Hyun-Wook Seong(성현욱),Gun-Woo Moon(문건우) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7

In this paper, a new half-bridge zeta converter employing a center-tapped rectifier is proposed. The proposed converter provides a bidirectional powering path in the rectifier. As a result, its improved rectifier voltage waveform reduces the output filter inductor size. Also, it maintains a wide ZVS range due to the characteristic of the conventional single-ended half-bridge zeta converter. The operational principles, the theoretical analysis, and the design considerations of the proposed converter are analyzed. To verify the performance of the proposed converter, experimental results from a 180W prototype are presented.

지체장애학생이 지각하는 사회적 지지가 건강관련 삶의 질에 미치는 영향

이재범(Jae Bum Lee),김용국(Yong Kuk Kim) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.39

The objective of this study is to explain the effects of social support perceived by students with physical disabilities on their health-related quality of life. For this, we examined differences in social support and health-related quality of life according to the detailed disability type of students with physical disabilities, and tested the multidimensional relations between the sub-factors of social support and health-related quality of life. The subjects of this study were students with physical disabilities at H University in K Province, and we collected the responses of 144 students aged over 20 using a rating scale whose psychometric validity had been tested. According to the results of MANOVA, social support and health-related quality of life in students with physical disabilities were different according to detailed disability type. In addition, the theoretical compatibility of the two variables was confirmed through a structural equation model. Furthermore, when the correlation between the two variables was analyzed through multiple regression analysis, the sub-factors showed high explanatory power for the sub-factors of health-related quality of life, that is, physical function, role limitations, and general health, excluding mental health. Based on these results, we discussed how to provide social support in order to enhance health-related quality of life in students with physical disabilities.

《화랑세기》 `이종욱본` 의 저자와 사료적 가치에 대하여

이재범(Lee, Jae-bum) 신라사학회 2009 新羅史學報 Vol.0 No.17

논문 : 신숭겸(申崇謙)의 생애(生涯)와 사후(死後) 추숭(追崇)

이재범 ( Jae Bum Lee ) 수선사학회 2013 史林 Vol.0 No.44

Although Sin-Sunggyeom is estimated that he was born in Gokseong[谷城], Cholla province[全羅道] and a member of the powerful family[豪族] with the locally based, people who lived in his time remembered him as a man of Chuncheon[春川]`s origin. And then this memory was recorded on Koryeosa[高麗史] that the central government complied. However this memory was replaced by an opinion that he is a man of Gokseong`s origin as the local memories spread, transmitted to the central government, and was recorded on the local paper. Even if Sin-Sunggyeom was known as a man who was originally ``Im-Hyub[任俠], he seemed a general who had both literary and military arts, and had the local influence power. It may persume that he joined Gungye[弓裔]`s political power by the time Wang-Gun[王建], a commander who served Gungye, was taking southwestern seaboard in korea, in 903. However, when Gungye renamed the name of country as Majin[摩震] and also tried to establish a strong centralized state and to make landed proprietors[豪族] government officials, they came into conflict with Gungye`s political power because they might lose their landed base. It presume that Sin-Sunggyeom[申崇謙] began to be connected with Chuncheon around that time. After Park-Yoo[朴儒] who was a member of the powerful family in Chuncheon fled because of discord with Goongye, the area seemed to be administered by Sin-Sunggyeom. So when Sin-Sunggyeom died in place of the king Taejo[太祖] in Koryeo Dynasty during a battle, Chuncheon seemed to be chosen as his burial ground. Since Sin-Sunggyeom`s loyalty had been passed down up to Chosun Dynasty, a movement for worship of him had constantly done. And his characteristic has been passed down until now beyond time and space. Especially in the late of Chosun Dynasty, the movement for worship expanded to the construction of his temple. The reason that the movement for worship of him as an absolute symbol of loyalty strengthened by spreading the propagation of Sung Confucianism that emphasizes the loyalty and filial piety after the war of the years of Im-Jin[壬辰] and Beong-Ja[丙子] is understood. He had been esteemed for his achievements as a meritorious retainer at the founding of a dynasty and his dead on half of the king Taejoduring Koryeo Dynasty, and had been recognized as a symbol of loyalty like Gisin[紀信] who died in place of the king Kojo [高祖] in Han[漢] Dynasty, China during Chosun Dynasty. His loyalty has been the steadfast object of the respect and admiration in spite of replacement of dynasties.

ERP 도입 공시와 시장가치 변화에 관한 연구

이재범(Lee Jae-Bum) 한국경영교육학회 2004 경영교육연구 Vol.36 No.-

급변하는 환경과 다양화 되는 시장변화에 대처하기 위하여 많은 기업들이 경영 전략적 차원에서 ERP 시스템을 이용하고 있지만, ERP 도입을 통해 기업이 얻게 되는 효익(benefits)에 대해서는 상반된 견해들이 제기되고 있다. 이처럼 ERP 도입으로 인한 기업가치 측정에 있어서 긍정적인 면과 부정적인 측면이 제기되는 이유는 정보시스템 실행결과에 대한 상이한 차이와 정보기술의 전략적 특성을 측정하기 위한 시스템 품질, 정보품질, 사용자 만족도, 경쟁우위(Competitive advantage)등 무형의 성과를 측정해야 한다는 난점을 지니고 있기 때문이다. 따라서 본 연구는 52개 상장기업을 대상으로 1996년 1월 1일부터 2003년 8월 31일 사이에 발생한 ERP 도입 공시에 대한 주식시장의 반응을 사건연구방법론(event study methodology)을 이용하여 분석하였다. 또한 본 연구에서는 기업규모 및 재무 건전도와 같은 요인이 ERP 도입 공시에 따라 기업가치에 어떠한 영향을 주는지 조사하였다. 본 연구의 결과로 (1)ERP 도입에 관한 공시는 공시주체 기업의 주가에 긍정적인 영향을 주었다고 볼 수 없었으며, (2)ERP 도입 공시는 기업규모에 따라 정보효과가 발생되고 있는 증거라고 설명할 수 있었으며, (3)기업의 재무 건전도는 ERP 도입 공시 효과에 영향을 미치지 않는 것으로 나타났다. One interesting question on ERP(Enterprise Resource Planning) systems is whether implementations of ERP provide competitive edges to firms ERP systems are claimed to have the positive net benefits. However, exact measuring the extent to which ERP systems add value to firms is problematic because of the qualitative nature of many of the benefits derived from ERP implementations. The purpose of the study is to empirically investigate stock market effects of ERP implementation announcements. Since stock price is one indicator capable of capturing the costs and future long - term benefits of ERP implementation. this study can provide an empirical valid evidence for the net benefits of ERP implementation. Some contextual factors, firm size, financial health may affect the strength and direction of the stock market reaction. The samples have been collected during the period January1, 1996 through August 31, 2003 and finally 52 samples were analyzed. The announcements of ERP implementations do not affect stock prices. However, in the small firms ERP announcements have positive effects on stock market. In future, analysis are needed with more large samples.