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A review of thickness measurements of thick transparent layers using optical interferometry
Jungjae Park,김종안,Heulbi Ahn,Jaeseok Bae,진종한 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.3
Thickness is a typical parameter related to length, of which measurements are conducted in various industrial fields, such as the automotive, aviation, ship-building, semiconductor, and display industries. Among various measurement techniques, optical interferometry is very attractive in terms of reliability owing to the direct realization of the metre. Moreover, the nature of this non-contact method is such that it does not damage samples. In this review, optical interferometric methods for measuring thicknesses of thick transparent layers are introduced through a discussion of basic principles and applications. With consideration of optical layouts and analysis methods of interference signals, monochromatic laser interferometry, low-coherence interferometry, and spectral interferometry are introduced and discussed in chapters 2, 3 and 4, respectively. With regard to spectral interferometry, the two different key technologies of spectrally resolved interferometry and wavelength-scanning interferometry are covered in different subsections of chapter 4.
New methodology to concentrate fossil pollen for radiocarbon dating and stable isotope analyses
Jungjae Park 국토지리학회 2004 국토지리학회지 Vol.38 No.1
Since Brown et al. (1989) first reported the direct dating of fossil pollen concentrates by AMS, many researchers have made efforts to obtain an enough amount of fossil pollen from sediments for the AMS radiocarbon dating. Visually sorting a large number of pollen grains is however very difficult and time consuming. I found that by the use of flow cytometry it is possible to concentrate a substantial amount of pollen from sediments within a short time. Another advantage of cytometric sorting is that it minimizes the necessity for chemical treatments, which may shift the isotopic ratios of pollen. The research results indicate that high resolution of paleo records can be constructed comparing between isotopic ratios of modern pollen samples and fossil pollen samples. The use of fossil pollen concentrates sorted by the flow cytometer for the AMS radiocarbon dating and isotopic analyses will help revealing the past climate change.
Biogeographical Studies in Korea
Jungjae Park 대한지리학회 2012 대한지리학회지 Vol.47 No.4
본 논문에서는 지금까지의 국내 생물지리학 연구를 세 분야로 구분하여 검토하였다: 1) 환경 인자와 식물 분포 간 관계, 2) 과거 식생과 기후, 3) 인간과 환경 간 상호작용. 과거 한국(국내) 지리학계에서 생물지리학은 중시되지 않았다. 이로 인해 현재 저변은 매우 얕은 실정이다. 그러나 생물지리학의 향후 전망은 나쁘지 않으며 앞으로 더욱 발전할 수 있는 가능성을 내재하고 있다. 국내에서 생물지리학을 점진적으로 꾸준하게 발전시키기 위해서는 보다 많은 학생들을 생물지리학 분야로 유도하는 것이 중요하다. In this paper, three general academic issues in Korean biogeographical studies were comprehensively reviewed: 1) relationship between environmental factors and plant distribution, 2) past vegetation and climate 3) interaction between humans and environment. Biogeography in Korea is poorly developed field and has been generally ignored by geographers in Korea. The future for biogeography in Korea however seems promising and Korean biogeographers have a great opportunity to develop their field. To attract more prospective graduate students into biogeography and train them would be very important for the gradual and persistent development of geographical biogeography in Korea.
Jungjae Kim,Kyungjin Lee 전북대학교 휴양및경관계획연구소 2017 휴양및경관연구 (J East Asian Landscape Studies) Vol.11 No.3
The recent trend of local tourism is moving toward the discovery of hidden resources, breaking from the concept of utilizing the existing resources, and of creating various stories based upon discovered resources. Accordingly, this research is about establishing master plans for a tourist destination named Jeongeupsa, a ballad made during Baekje Kingdom, which is a literary resource representing Jeongeup-si. These plans will be established by applying a research process of spatial storytelling. This research contains theoretical consideration through advanced research on spatial storytelling and Jeongeupsa. The spatial storytelling research process that is suggested shall include an analysis of the context of texts, understanding of sense of place, application of a theme and a story, construction of a space, and sharing of a story. The space composition is as follows: First, district of Jeongeupsa based on the story resources of Jeongeupsa, a ballad made during Baekje Kingdom; second, Beakje Jeongchonhyun based on the story resources of the Keunsaeam wells; finally, it was composed of Jeonghae village district through story resources of Jeonghae village. The spatial storytelling system has applied while establishing master plans for the tourist destination in order to turn a tourist destination into a space where visitors can easily be aware of various story resources that a space has and stories and visitors can interact and communicate each other, breaking from the old unified planning system. The purpose of this research is to find a new method of tourist spot planning. I hope the method suggested by this research can be of help to a process of realizing various tourism resources.
Jungjae Park(박정재),Youngho Shin(신영호) 대한지리학회 2010 대한지리학회지 Vol.45 No.5
후기 플라이스토신 및 홀로신 시기 동아시아 여름 몬순의 변화를 밝히기 위해 지화학적 분석 방법(탄소동원원소(δ<SUP>13</SUP>C), 탄질율 (C/N), 대자율, 입도 분석 등)을 활용하여 서해안 염하구 습지 퇴적물을 분석하였다. 연구 결과에 따르면 한반도에서 여름 몬순은 7,700-7,800년 전에 정점이었고 7,400년 전 경부터 약화되기 시작한다. 그리고 마지막 빙하 최성기 중 24,000-24,500년 전 경에는 몬순이 상대적으로 약했고 18,500-19,500년 전 경에는 상대적으로 강했다. 염하구 습지 퇴적물의 지화학적 분석 자료는 과거 여름 몬순의 변동을 밝힐 수 있는 새로운 고환경 자료로서 가치를 갖는다. 특히 고환경 자료가 부족한 한국 학계에 큰 도움이 될 것으로 사료된다. Geochemical and physical investigations such as δ<SUP>13</SUP>C isotope ratio, carbon/nitrogen (C/N) ratio, magnetic susceptibility (MS), and particle size analyses were carried out on the estuarine tidal flat sediments from the west coast of Korea in order to reconstruct the East Asian summer monsoon variability during the late Pleistocene and Holocene. Our results indicated that the summer monsoon probably peaked around 7,700-7,800 yr BP and then started to decline about 7,400 yr BP in the Korean peninsular, and that the monsoon was relatively weak between 24,000-24,500 yr BP but relatively strong between 18,500-19,500 yr BP during the Last Glacial Maximum. Our estuarine geochemical data have proven to be valuable as a new proxy for detecting the shifts in monsoon strength. This new evidence will be helpful, especially for Korean paleoenvironmental studies with few proxy data archives.
Impact of White Matter Lesions on Depression in the Patients with Alzheimer’s Disease
JungJae Lee,EunYoung Lee,SeokBum Lee,JoonHyuk Park,TaeHui Kim,HyunGhang Jeong,JaeHyoung Kim,JiWon Han,KiWoong Kim 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.4
Objective-Comorbid depression is common in patients with Alzheimer’s disease (AD). An increase in white matter lesions (WMLs) has been associated with depression in both elderly individuals with normal cognition and patients with Alzheimer’s disease. We investigated whether the severity and location of WMLs influence the association between WMLs and comorbid depression in AD. Methods-We enrolled 93 AD patients from Seoul National University Bundang Hospital. We administered both the Mini International Neuropsychiatric Inventory (MINI) and the Korean version of the Consortium to Establish a Registry for Alzheimer’s Disease Assessment Packet (CERAD-K) clinical and neuropsychological battery. Subjects also underwent brain magnetic resonance imaging (MRI). We diagnosed AD according to the criteria of the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer’s Disease and Related Disorders Association. We diagnosed depressive disorders according to the DSM-IV diagnostic criteria, and evaluated the severity of depressive symptoms using the Korean version of the Geriatric Depression Scale (GDS-K). We quantified the WML volumes from the brain MRI using a fully automated segmentation algorithm. Results-The log of the WML volume in the frontal lobe was significantly associated with depressive disorders (odds ratio=1.905, 95% CI=1.027–3.533, p=0.041), but not with the severity of depressive symptoms as measured by the GDS-K. Conclusion-The WML volume in the frontal lobe conferred a risk of comorbid depressive disorders in AD, which implies that comorbid depression in AD may be attributed to vascular causes.