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생물기후를 이용한 위해우려종(양서류)의 국립공원 서식 가능성 예측
박민규(Minkyu Park) 국립공원연구원 2021 국립공원연구지 Vol.11 No.1
환경부는 외래생물의 유입을 사전 예방하고 효과적으로 관리하기 위해 위해우려종을 지정하고 관리 정책을 추진하고 있다. 이 연구는 위해우려종 중 생물기후에 민감한 양서류를 대상으로 종분포모형을 활용하여 현재 및 미래 기후의 국립공원 서식 가능성을 예측하였다. 연구 대상종은 6개 종이며, 현재 및 RCP4.5, RCP8.5 기후 조건의 서식 가능성을 7개 Case로 구분하였다. 예측 결과 위해우려종의 자생지 위도(latitude) 범위가 한반도의 위도 범위와 유사한 Japanese common toad, Japanese brown frog는 대부분이 국립공원에서 서식 가능할 것으로 예측되었고 Marsh frog, Pool frog, African clawed frog는 기후의 극한지수 차이로 국립공원의 서식 가능성이 낮았다. The Ministry of Environment has designated potential risk species to prevent and effectively manage the alien species. This study predicted the potential habitat possibilities of the Korea national park for amphibians sensitive to climate change, present and future climate and used species distribution models for prediction. There are six amphibians for predicting habitat potential, and seven cases are classified according to climate change scenarios (present, RCP 4.5, RCP 8.5). According to the prediction results, Japanese common toad and Japanese brown frog were predicted to be inhabitable in most national parks. The reason may be that the bio-climate was also similar, because their latitude of native distributions area were similar to that of the Korean Peninsula. On the other hand, Marsh frog, Pool frog and African clawed frog are less habitat possibilities, due to differences in the extreme bio-climate between the native distributions area and the Korean peninsula.
Park, Minkyu,Park, Jongsun,Kim, Seungill,Kwon, Jin‐,Kyung,Park, Hye Mi,Bae, Ik Hyun,Yang, Tae‐,Jin,Lee, Yong‐,Hwan,Kang, Byoung‐,Cheorl,Choi, Doil Blackwell Publishing Ltd 2012 The Plant journal Vol.69 No.6
<P><B>Summary</B></P><P>Although plant genome sizes are extremely diverse, the mechanism underlying the expansion of huge genomes that did not experience whole‐genome duplication has not been elucidated. The pepper, <I>Capsicum annuum</I>, is an excellent model for studies of genome expansion due to its large genome size (2700 Mb) and the absence of whole genome duplication. As most of the pepper genome structure has been identified as constitutive heterochromatin, we investigated the evolution of this region in detail. Our findings show that the constitutive heterochromatin in pepper was actively expanded 20.0–7.5 million years ago through a massive accumulation of single‐type <I>Ty3/Gypsy</I>‐like elements that belong to the Del subgroup. Interestingly, derivatives of the Del elements, such as non‐autonomous long terminal repeat retrotransposons and long‐unit tandem repeats, played important roles in the expansion of constitutive heterochromatic regions. This expansion occurred not only in the existing heterochromatic regions but also into the euchromatic regions. Furthermore, our results revealed a repeat of unit length 18–24 kb. This repeat was found not only in the pepper genome but also in the other solanaceous species, such as potato and tomato. These results represent a characteristic mechanism for large genome evolution in plants.</P>
Bivariate Frequency Analysis of Annual Maximum Rainfall Event Series in Seoul, Korea
Park, Minkyu,Yoo, Chulsang,Kim, Hyeonjun,Jun, Changhyun American Society of Civil Engineers 2014 Journal of hydrologic engineering Vol.19 No.6
The return period of a rainfall event is estimated by the frequency analysis for a given rainfall duration. Thus, it is possible to derive different return periods with different rainfall durations for a given rainfall event. The longest derived return period is generally cited to represent the rainfall event. However, it is not clear if the longest derived return period is a representative measure of the given rainfall event. In this study, as a solution for this problem, a bivariate frequency analysis was introduced. As a first step, annual maximum rainfall events were selected by applying a bivariate exponential distribution. As an application, a total of 1,534 rainfall events observed in Seoul, Korea, over the last 46years were analyzed. The annual maximum rainfall event series were then analyzed by applying a bivariate logistic model. The results were also compared with those from a conventional univariate frequency analysis. The findings of this study are summarized as follows: (1)the bivariate exponential distribution satisfactorily represented the duration and total rainfall depth data of all independent rainfall events, and the annually estimated parameters of the bivariate exponential distribution were more reasonable with respect to annual changes in the climatic conditions than those for the entire data period; (2)by using the bivariate logistic model, the return period was able to be assigned to each annual maximum rainfall event; and (3)rainfall quartiles of the univariate frequency analysis were bigger than those from the bivariate frequency analysis for rather short return periods of less than 30years, but smaller for rather long return periods exceeding 100years, primarily attributable to the smaller variance of the univariate annual maximum series.
Semi-lumped Balun Transformer using Coupled LC Resonators
Park, Jongcheol,Yoon, Minkyu,Park, Jae Yeong The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
This paper presents a semi-lumped balun transformer using conventional PCB process and its design theory and geometry for the maximally flat response and wide bandwidth using magnetically coupled LC resonators. The proposed balun is comprised of two pairs of coupled resonators which share one among three LC resonators. It provides an identical magnitude and phase difference of 180° between two balanced ports with DC isolation and an impedance transformation characteristic. Theoretical design and analysis were performed to optimize the inductance and capacitance values of proposed balun device for obtaining the wide bandwidth and maximally flat response in its pass-band. Three balun transformers with a center frequency of 500 MHz were demonstrated for proving the concept of design proposed. They were fabricated by using lumped chip capacitors and planar inductors embedded into a conventional 4-layered PCB substrate. They exhibited a maximum magnitude difference of 0.8 dB and phase difference within 2.4 degrees.
Ultracompact Intrinsic Micro Air-Cavity Fiber Mach–Zehnder Interferometer
Minkyu Park,Sejin Lee,Woosung Ha,Dae-Kyu Kim,Woojin Shin,Ik-Bu Sohn,Kyunghwan Oh IEEE 2009 IEEE photonics technology letters Vol.21 No.15
<P>A compact intrinsic fiber Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated by incorporating a micro air-cavity ablated by femtosecond laser irradiation. A short cavity of length ~ 10 mum along the single-mode fiber core provided two optical paths: one propagating through the air and the other guided along the ring-shaped silica cladding. A spectral analysis confirmed MZI in a good agreement with experimental results. Temperature-dependent spectral shifts were measured and analyzed.</P>