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Predicting the Invasion Potential of Pink Muhly (Muhlenbergia capillaris) in South Korea
Park, Jeong Soo,Choi, Donghui,Kim, Youngha National Institute of Ecology 2020 국립생태원회보(PNIE) Vol.1 No.1
Predictions of suitable habitat areas can provide important information pertaining to the risk assessment and management of alien plants at early stage of their establishment. Here, we predict the invasion potential of Muhlenbergia capillaris (pink muhly) in South Korea using five bioclimatic variables. We adopt four models (generalized linear model, generalized additive model, random forest (RF), and artificial neural network) for projection based on 630 presence and 600 pseudo-absence data points. The RF model yielded the highest performance. The presence probability of M. capillaris was highest within an annual temperature range of 12 to 24℃ and with precipitation from 800 to 1,300 mm. The occurrence of M. capillaris was positively associated with the precipitation of the driest quarter. The projection map showed that suitable areas for M. capillaris are mainly concentrated in the southern coastal regions of South Korea, where temperatures and precipitation are higher than in other regions, especially in the winter season. We can conclude that M. capillaris is not considered to be invasive based on a habitat suitability map. However, there is a possibility that rising temperatures and increasing precipitation levels in winter can accelerate the expansion of this plant on the Korean Peninsula.
Hyeon-Shik Hwang,Donghui Yuan,Kweon-Heui Jeong,Gi-Soo Uhm,Jin-Hyoung Cho,Sook-Ja Yoon 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.2
Objective: To identify the right and left difference of the facial soft tissue landmarks three-dimensionally from the subjects of normal occlusion individuals. Methods: Cone-beam computed tomography (CT) scans were obtained in 48 normal occlusion adults (24 men, 24 women), and reconstructed into 3-dimensional (3D) models by using a 3D image software. 3D position of 27 soft tissue landmarks, 9 midline and 9 pairs of bilateral landmarks, were identified in 3D coordination system, and their right and left differences were calculated and analyzed. Results: The right and left difference values derived from the study ranged from 0.6 to 4.6 mm indicating a high variability according to the landmarks. In general, the values showed a tendency to increase according to the lower and lateral positioning of the landmarks in the face. Overall differences were determined not only by transverse differences but also by sagittal and vertical differences, indicating that 3D evaluation would be essential in the facial soft tissue analysis. Conclusions: Means and standard deviations of the right and left difference of facial soft tissue landmarks derived from this study can be used as the diagnostic standard values for the evaluation of facial asymmetry.
Soonkyu HWANG,Namil LEE,Donghui CHOE,Yongjae LEE,Woori KIM,Yujin JEONG,Suhyung CHO,Bernhard PALSSON,Byung-Kwan CHO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Identification of transcriptional regulatory elements in the GC-rich Streptomyces genome is essential for the production of novel biochemicals from secondary metabolite biosynthetic gene clusters. We identified the transcriptional regulatory elements in β-lactam antibiotic-producing Streptomyces clavuligerus ATCC 27064 by determining transcript 3¢-end positions (TEPs) using term-seq. Termination of transcription was governed by three classes of TEPs, of which each displayed unique sequence features. The data integration with transcriptome data generated transcription units (TUs) and transcription unit clusters (TUCs). TU architecture showed that the transcript abundance in TU isoforms of a TUC was potentially affected by the sequence context of their TEPs. We also identified TU features of XRE family regulator and DUF397 domain-containing protein, showing the abundance of bidirectional TEPs. Finally, we found potential cis- and trans-regulatory elements that played a major role in 5’ and 3’-UTR. These findings highlight the role of the regulatory elements in transcription termination and posttranscriptional processing in Streptomyces sp.
Hwang, Hyeon-Shik,Yuan, Donghui,Jeong, Kweon-Heui,Uhm, Gi-Soo,Cho, Jin-Hyoung,Yoon, Sook-Ja The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.2
Objective: To identify the right and left difference of the facial soft tissue landmarks three-dimensionally from the subjects of normal occlusion individuals. Materials and Methods: Cone-beam computed tomography (CT) scans were obtained in 48 normal occlusion adults (24 men, 24 women), and reconstructed into 3-dimensional (3D) models by using a 3D image soft ware. 3D position of 27 soft tissue landmarks, 9 midline and 9 pairs of bilateral landmarks, were identified in 3D coordination system, and their right and left differences were calculated and analyzed. Results: The right and left difference values derived from the study ranged from 0.6 to 4.6 mm indicating a high variability according to the landmarks. In general, the values showed a tendency to increase according to the lower and lateral positioning of the landmarks in the face. Overall differences were determined not only by transverse differences but also by sagittal and vertical differences, indicating that 3D evaluation would be essential in the facial soft tissue analysis. Conclusions: Means and standard deviations of the right and left difference of facial soft tissue landmarks derived from this study can be used as the diagnostic standard values for the evaluation of facial asymmetry.
Gauge Dependence of Gravitational Waves Generated from Scalar Perturbations
Hwang, Jai-chan,Jeong, Donghui,Noh, Hyerim American Astronomical Society 2017 The Astrophysical Journal Vol.842 No.1
<P>A tensor-type cosmological perturbation, defined as a transverse and traceless spatial fluctuation, is often interpreted as gravitational waves. While decoupled from the scalar-type perturbations in linear order, the tensor perturbations can be sourced from the scalar-type in nonlinear order. The tensor perturbations generated by the quadratic combination of a linear scalar-type cosmological perturbation are widely studied in the literature, but all previous studies are based on a. zero-shear gauge without proper justification. Here, we show that,. being second order in perturbation, such an induced tensor perturbation is generically gauge dependent. In particular, the gravitational wave power spectrum depends on the hypersurface (temporal gauge) condition taken for the linear scalar perturbation. We further show that, during the matter-dominated era, the induced tensor modes dominate over the linearly evolved primordial gravitational wave. amplitude for k greater than or similar to 10(-2) [h/Mpc] even for the gauge that gives the. lowest induced tensor modes with the optimistic choice of primordial gravitational waves (r = 0.1). The induced tensor modes, therefore, must be modeled correctly specific to the observational strategy for the measurement of primordial gravitational waves from large-scale structure via, for example, the. parity-odd mode of weak gravitational lensing, or clustering fossils.</P>
김도훈(DoHun Kim),곽민성(MinSung Kwak),김동희(DongHui Kim),이상원(SangWon Lee),이준우(JunWoo Lee),정한별(HanByeol Jeong),박세진(Sejin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
As the number of people choosing fish as pets increases, related fish products are emerging. However, most of these products have inadequate functionality and do not effectively address consumer inconvenience. This paper uses Arduino and Odroid to enable sensors and motors in the aquarium to perform specified tasks and be remotely controlled. This device provides the following functions: first, automatic feeding reservation and manual operation; second, lighting reservation and manual operation; third, measurement of temperature, acidity, turbidity in the aquarium and automatic replenishment; and fourth, visualization and alarm functions for measured data. Through a maintenance ability experiment, it was confirmed that the aquarium maintains the optimal conditions set by the user even under rapid environmental changes.
Nonlinear matter bispectrum in general relativity
Biern, Sang Gyu,Gong, Jinn-Ouk,Jeong, Donghui American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.10
We show that the relativistic effects are negligibly small in the nonlinear density and velocity bispectra. Although the nonlinearities of the Einstein equation introduce additional nonlinear terms to the Newtonian fluid equations, the corrections to the bispectrum only show up on superhorizon scales. We show this with the next-to-leading order nonlinear bispectrum for a pressureless fluid in a flat Friedmann-Robertson-Walker background by calculating the density and velocity fields up to fourth order. We work in the comoving gauge, where the dynamics is identical to the Newtonian up to second order. We also discuss the leading order matter bispectrum in various gauges, and show yet another relativistic effect near horizon scales that the matter bispectrum strongly depends on the gauge choice.