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      • KCI등재

        부여 관북리 유적의 변천과정과 사비도성의 전개

        김대영 ( Gim¸ Dae-young ) 백제학회 2020 백제학보 Vol.0 No.34

        본고는 백제 사비기 왕궁과 관련된 시설로 주목되고 있는 부여 관북리 유적의 단계별 변화 양상을 대단위 성토층과 유적의 성격이 변화되는 시점을 기준으로 크게 3단계로 분류한 뒤, 유적의 단계별 변화모습과 여기서 도출되는 사비도성의 전개과정을 살펴보고자 하였다. 관북리 유적의 1단계는 관북리 일대에 대단위 성토행위가 진행되기 이전으로 이 시기에는 자연지형에 맞춰 도성 내 공간구분이 이루어졌던 것으로 판단된다. 관북리 유적은 중앙부의 자연곡부를 중심으로 동남쪽과 서남쪽으로 능선이 갈라져 내려오는데, 이러한 지형에 맞춰 동남쪽으로 흘러내리는 능선에는 생산과 관련된 유구, 서남쪽으로 흘러내리는 능선에는 저장과 관련된 유구들이 분포하고 있다. 2단계는 관북리 일대 지역에 1차 성토가 진행되며 관북리 유적 ‘라’지구를 중심으로 기와기단건물지가 조성되는 시기로 기와기단건물군과 장방형구덩이, 석곽고 등의 유구가 확인되며, 이 시기부터 관북리 일대 지역이 사비도성의 중심권역으로 부상되기 시작하였다. 3단계는 1차 성토된 구간의 상면으로 부분적인 성토가 진행되거나 그 외 지역에 2차 성토가 진행되는 시점으로 대형전각건물지와 담장터 등의 유구가 조성되는 시기이다. 익산 왕궁리 유적에도 유사한 형태의 대형건물지가 조성되며, 이 단계의 유적은 『三國史記』무왕 31년(630)조의 사비 궁궐 중수기사와 관련되는 것으로 판단된다. 사비천도 초기에 보이는 관북리 일대의 모습은 지형별로 공간이 구획되어 있어 계획적인 공간배치 모습을 보이나 유구의 성격이 왕궁과 같은 중심권역 보다는 이를 지원해주는 공간으로서의 성격을 가지고 있는 것으로 보인다. 최근 조사성과를 살펴보면 사비천도 초기의 중심권역은 관북리 일대보다는 그 동쪽의 쌍북리 일원에 해당될 가능성이 높다. 그러나 관북리 2단계 이후 관북리 일대가 도성 내 중심지로 부각되면서 그 남쪽의 정림사지나 궁남지 등 부여시가지 일대 평탄지가 대단위로 재개발되는 모습이 확인되는데, 이는 도성 내 공간 확장을 위하여 저지대를 중심으로 개발을 진행하면서 나타나는 현상으로 이러한 재개발이 진행되면서 현재 사비도성의 모습이 완성되었다. Sabi Capital was the last capital of the Baekjae Dynasty. It had maintained as the center of the Baekjae's history for 120 years after transferring the Capital in Sabi, now Buyeo. Thus, there are so many sites related in the Castles, royal palaces, tombs, temples of Baekjae. but the controversy over the location has continued so far. Among the remains identified in the Buyeo area, the most notable site is Gwanbuk-ri site that associated with the royal palace. In this paper, we are going to classified the stepwise change aspects of the Gwanbuk-ri site into three phases by the large-scale embankment layer and the time of site's character transition. Through this process, we will investigate the transitions in this sites and development process of Sabi Capital on this basis. The first phase of Gwanbuk-ri site was before the large-scale embankment process was carried out in this area. and it is considered that the space in the area was divided according to the natural landscape. The topography around Gwanbuk-ri site divides the ridges of the southeast and southwest, centering on the natural curves of Buso Mountain. In accordance with this topography, the remains related in production are located in the ridge that flows southeastward. and related in storage are located in the ridge that flows southwestward. The second phase is when the roof-tile foundation building site was built around the 'la' district of Gwanbuk-ri site after the first large-scale embankment process was completed. It is identified with the group of the roof-tile foundation buildings, rectangular pits, storage and so on. from this period, the area around Gwanbuk-ri may have emerged as the central area of Sabi Capital. The third phase is the large-scale buildings, fences, and etc. were constructed on theupper side of the central building group in the second phase after the partial embankment process. Also, a similar type of large-scale building site was constructed at the Wanggung-ri site in Iksan. this phase is associated with the reconstruction article of the 31st year of King Mu's reign on 『三國史記』 Also From the early and mid 7th century, which is on the third phase of the Gwanbuk-ri site, It is confirmed that flat land on southward of the royal palace was redeveloped to the large scale land, This phenomenon is caused by the development of low-lying areas to expand the space in the capital. Through this process, Sabi capital had completed that now we recognize.

      • KCI등재

        Constitutive Model of Triple-Step-Aged Al–Mg–Si Alloy Incorporating Precipitation Kinetics

        Daeyoung Kim,Hansol Maeng,Young Choi,Hyunjoo Choi,Seok‑Jae Lee 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

        In the present study, we present a constitutive model for predicting tensile behavior by considering the characteristics ofindividual precipitates occurring during a single- or triple-step aging treatment of Al–Mg–Si alloy. The solution treatment wasconducted at 550 °C for 1 h and then quenched in water to reach room temperature. Different aging treatments were carriedout: at 170 °C for 8 h and 210 °C for 4 h for single-step aging and at 140 °C for 80 min, 170 °C for 80 min, and 200 °C for80 min for triple-step aging. The triple-step aging process resulted in excellent strength, even though a shorter processingtime was required than for conventional single-step aging. This was due to the effects of precipitation strengthening and dispersionstrengthening related to the various aging precipitates. In particular, it was verified that the calculated yield strengthcould be significantly varied according to the types and characteristics of each precipitation phase.

      • SCIESSCISCOPUSKCI등재
      • Differential Tumorigenic Effects by C-Myc Mutants in Liver Cancer

        ( Daeyoung Kim ),( Hyuk Moon ),( Sook In Chung ),( Simon W. Ro ),( Kwang-hyub Han ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1

        Aims: Liver cancer is a major health concern worldwide, ranking third in terms of cancer-related mortality. The c-Myc gene is epigenetically altered in almost 50% of human liver cancers, leading to persistent over-expression of cMyc. In addition to quantitative changes of cMyc protein in cancers, mutation leading to amino acid substitution of cMyc has been found in a certain type of cancers. In this study, we compared tumorigenic potentials among c-Myc mutants in the liver. Methods: Transgenic liver cancer mouse models expressing different c-Myc mutants were developed using hydrodynamic transfection. Transposon vectors encoding the wild-type c-Myc, c-MycT58A, and c-MycS71F were constructed. To induce liver cancer, 20 μg of transposons were mixed with plasmids expressing the Sleeping Beauty transposase and then diluted in 2.5 ml of 0.9% saline. The DNA mixtures were injected into the lateral tail veins of 6-week-old C57BL/6 mice. Mice were monitored at least twice per week and sacrificed when moribund. Tumor-bearing livers were formalin fixed for hematoxylin- eosin staining. Results: Hepatocellular carcinomas (HCC) were induced by the stable expression of c-Myc and shp53. Wild type c-Myc was less tumorigenic than c-Myc2T58A or c-Myc2S71F when co-expressed with shp53. The c-Myc mutant groups, c-Myc2T58A or c-Myc2S71F died earlier than the c-Myc wild type group (p< 0.05). There was no difference in phenotypes of malignant hepatocytes among tumors induced by cMyc mutants and wild-type. Conclusions: Co-expression of c-Myc and shp53 in the mouse liver promoted hepatocarcinogenesis. Wild type c-Myc was less tumorigenic than c-Myc2T58A or c-Myc2S71F under the condition that P53 was down-regulated.

      • KCI등재

        The Effects of Consumer Preferences for Wireless Internet Services on the Demand for Mobile Devices

        Daeyoung Koh,Hyunseung Cho,Yoon-Ah Jo 한국마케팅과학회 2011 마케팅과학연구 Vol.21 No.3

        Recently, smart phones such as the Galaxy S and IPhone, and tablet PCs such as the Galaxy Tab have been introduced and become widespread in the market, thus the environment for wireless Internet services has been improving. As the market has improved, consumer preferences for mobile devices and the relationship between these devices and wireless Internet services regarding consumer preferences have become a very important issue. However, although there have been a considerable number of studies on the demand for mobile devices, it is not easy to find previous studies on the relationship between consumer preferences for specific attributes of wireless Internet services and the demand for mobile devices. The main purpose of this study is to analyze which mobile device is more likely to be preferred or become the main channel for wireless Internet services and how the demand for each mobile device is influenced by consumer preferences for specific attributes of wireless broadband Internet services used on it, and to induce managerial implications based on the main findings. To derive the results on consumer preferences, conjoint analysis is used. The survey was conducted using 1,000 Korean consumers. In the survey, respondents are allowed to choose more than one hypothetical alternative representing a mobile device combined with a certain type of wireless broadband Internet service if they desired. To estimate the consumer preferences quantitatively, a multivariate probit model is used. According to the estimation results, owing to their portability, smart phones are more likely to become a major channel for wireless Internet services despite their drawbacks in terms of display size and performance. Portability is the most important factor affecting the choice of a mobile device when using wireless Internet services. Therefore, manufacturers of mobile devices for wireless Internet services should improve the overall functionality and performances of mobile devices without negatively affecting portability. However, at the same time, consumer preferences for specific attributes of wireless Internet services are found to affect the demand of each mobile device much differently. Therefore, the prediction that smart phones will be the prevalent mobile device for use of wireless Internet services can be somewhat changed, depending on which and how wireless Internet services are provided to each mobile device and how they affect the demand for each mobile device. As mentioned above, there are significant differences between mobile devices with regard to the effects of mobility, data transfer speed, type of contents or Internet interface for wireless Internet services. It is found that the mobility of wireless Internet service is highly valued for smaller devices, but not much for notebook PCs. In contrast, data transfer speed and similarities in the type of contents or Internet interface to those provided by fixed broadband Internet services become more important for larger mobile devices. Thus, it is necessary for wireless Internet service providers to differentiate and optimize their contents and Internet interfaces properly for various mobile devices. Additionally, it is reasonable that manufacturers of smart phones focus on mobility and portability (or convenience) rather than adding sophisticated functions or pursuing higher-level specifications. Further, for smart phones, for which mobility and convenience are important, wireless Internet service providers should develop and provide easy and convenient programs, rather than advanced programs that require high device performance. Lastly, with respect to individual demographics, young and highly educated people are more likely to be consumers of newly introduced mobile devices for using wireless Internet services. Therefore, these young and highly educated consumers should be considered a major target for manufacturers of mobile devices for wireless Internet services.

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