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Nonparametric Bayesian modeling for monotonicity in catch ratio
Kim, Dal Ho,Ryu, Hyunnam,Kim, Yongku Informa UK (TaylorFrancis) 2018 Communications in statistics. Simulation and compu Vol.47 No.4
<P>This article proposes nonparametric Bayesian approaches to monotone function estimation. This approach uses a hierarchical Bayes framework and a characterization of stick-breaking process that allows unconstrained estimation of the monotone function. In order to avoid the limitation of parametric modeling, a general class of prior distributions, called stick-breaking priors, is considered. It accommodates much more flexible forms and can easily deal with skewness, multimodality, etc., of the dependent variable response. The proposed approach is incorporated to model the catch ratio based on automatic weather station (AWS) data.</P>
김현남(HyunNam Kim),조영환(YoungHawn Cho),윤형석(HyungSeuk Yun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The Truck chassis frame is one of the most important part to decide the durability performance of the vehicle. Fullvehicle proving ground test will be spent a lot of time and cost. So, Rig test method should be developed for the efficient development of new chassis Frame and the reduction of cost. In this paper, Multi-axial durability test was carried out, and test objective was the 6m3 Mixer Truck Frame&Sub-Frame. Road load data was measured under proving ground, and durability target was calculated using this data. Durability target is consist of 3 alternating loading which includes Vertical bending, Horizontal bending, Frame Torsion. And the correlation was performed by results of full-vehicle test.
Robust Bayesian analysis for autoregressive models
Hyunnam Ryu,Dal Ho Kim 한국데이터정보과학회 2015 한국데이터정보과학회지 Vol.26 No.2
Time series data sometimes show violation of normal assumptions. For cases where the assumption of normality is untenable, moreexible models can be adopted to accommodate heavy tails. The exponential power distribution (EPD) is considered as possible candidate for errors of time series model that may show violation of normal assumption. Besides, the use ofexible models for errors like EPD might be able to conduct the robust analysis. In this paper, we especially consider EPD as the flexible distribution for errors of autoregressive models. Also, we represent this distribution as scale mixture of uniform and this form enables efficient Bayesian estimation via Markov chain Monte Carlo (MCMC) methods.
Robust Bayesian analysis for autoregressive models
Ryu, Hyunnam,Kim, Dal Ho The Korean Data and Information Science Society 2015 한국데이터정보과학회지 Vol.26 No.2
Time series data sometimes show violation of normal assumptions. For cases where the assumption of normality is untenable, more exible models can be adopted to accommodate heavy tails. The exponential power distribution (EPD) is considered as possible candidate for errors of time series model that may show violation of normal assumption. Besides, the use of exible models for errors like EPD might be able to conduct the robust analysis. In this paper, we especially consider EPD as the exible distribution for errors of autoregressive models. Also, we represent this distribution as scale mixture of uniform and this form enables efficient Bayesian estimation via Markov chain Monte Carlo (MCMC) methods.
중국의 역사문화자원을 활용한 도시재생 특성에 관한 연구 -계획수립 방식 및 계획요소를 중심으로-
심현남(Hyunnam Sim),김동현(Donghyun Kim) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.1
Historical and cultural resources are formed over many years based on the region, possessing both regional symbolism and representativeness. This is closely tied to the identity of the local community and ultimately linked to urban competitiveness. While there is an increasing trend in discovering and utilizing regional historical and cultural resources for urban regeneration, there is limited research examining this from an urban planning perspective. In this study, we examine the characteristics of urban planning in the context of historical and cultural preservation and utilization efforts in Beijing, China, which has been making various efforts for urban regeneration. Firstly, we examine the establishment of Beijings historical and cultural area protection plan and categorize the urban planning principles for regeneration into three types. We then apply these principles to each case and analyze them. The key project by case involved a residential land reduction initiative for the preservation of historical and cultural resources and the creation of a pleasant living environment. Through an average reduction of 24% in residential areas, it was possible to secure public spaces, green areas, and traditional commercial spaces. The research results reveal the following planning characteristics: (1) urban planning accompanied by plans for the utilization of historical and cultural resources, (2) acceptance of exceptional regulatory relaxation, (3) provision of compromise alternatives for residents, and (4) a planning characteristic that seeks balance between preservation and improvement. Additionally, we derive implications centered around expected effects and propose policy directions for domestic urban regeneration. This study is distinct from previous research in that it examines cases through fundamental principles and strategies linking historical and cultural resources with urban planning, providing policy and practical implications based on this foundation.
A Spectropolarimetric Investigation of the Photospheric and Chromospheric Layers of Sunspots
김현남,김갑성,Kim, Hyunnam,Solanki, Sami.K.,Lagg, Andreas,Kim, Kap-Sung,Lim, Daye,Choe, G.S. 한국천문학회 2012 天文學會報 Vol.37 No.2
Spectro-polarimetry is the most powerful technique for deducing the magnetic structure of the Sun. Stokes vector allow us to infer the physical conditions in the solar atmosphere prevailing during the line formation. Inversion codes are the main tool to extract this information from the Stokes spectra. This study will focus on measurements of the chromospheric He I 1083.0 nm triplet and the photospheric Si I 1082.7 nm line. A spectropolarimetric data set of sunspots, obtained with the German Vacuum Tower Telescope (VTT) at the Teide observatory on Tenerife, is analyzed using an inversion technique. We will introduce the German Vacuum Tower Telescope and the inversion code HeLix, and will show data sets that are analyzed by HeLix. Finally I made variety plots and maps for understanding photospheric and chromospheric layers of sunspots.