변환된 자기회귀이동평균 모형에서의 예측구간추정

조혜민,오승언,여인권,Cho, Hye-Min,Oh, Sung-Un,Yeo, In-Kwon 한국통계학회 2007 응용통계연구 Vol.20 No.3

시계열자료를 분석하는데 있어 중요한 목적 중에 하나가 미래값에 대한 예측이다. 일반적으로 자기회귀이동평균모형에서는 백색잡음이 정규분포를 따른다는 가정 하에서 모수의 추론과 예측 및 예측구간의 추정이 이루어지고 있다. 그러나 자료가 이러한 가정을 만족하지 않는 경우, 자료를 가정에 맞게 변환시킨 후 분석하는 방법을 생각해 볼 수 있다. 이 논문에서는 변환된 자료를 분석하여 얻은 결과를 이용하여 본래의 척도에서의 미래값에 대한 예측구간을 추정하는 문제에 대해 알아본다. 제안하는 방법에서는 먼저 적절한 변환을 이용하여 자료를 정규가정을 만족하도록 변환시키고 변환된 자료를 이용하여 미래값에 대한 예측구간을 추정한 후, 역변환을 이용하여 예측구간을 추정한다. 이 논문에서는 시계열분석에서 모델링이 상대적으로 어려운 왜도의 문제를 해결하기 위해 Yeo-Johnson 변환을 중심으로 한 방법론을 소개한다. 모의실험 결과 제안된 방법에 의한 단측예측구간의 포함확률이 변환을 사용하지 않은 구간보다 명목수준에 가까운 것을 확인하였다. One of main aspects of time series analysis is to forecast future values of series based on values up to a given time. The prediction interval for future values is usually obtained under the normality assumption. When the assumption is seriously violated, a transformation of data may permit the valid use of the normal theory. We investigate the prediction problem for future values in the original scale when transformations are applied in ARMA models. In this paper, we introduce the methodology based on Yeo-Johnson transformation to solve the problem of skewed data whose modelling is relatively difficult in the analysis of time series. Simulation studies show that the coverage probabilities of proposed intervals are closer to the nominal level than those of usual intervals.

A New High Yielding Rice Variety with Multi-resistance to Diseases "Sujinbyeo"

Sang Jong Lim,No Bong Park,Do Yeon Kwak,Heung Gu Hwang,Ho Yeong Kim,Un Sang Yeo,Sae Jun Yang,Jong Rae Kang,You Cheon Song,Jeom Sik Lee,Jae Ki Chang,Woon Goo Ha,Byeong Geun Oh 한국육종학회 2003 한국육종학회지 Vol.35 No.1

Sujinbyeo', a new mid-late maturing japonica rice variety (Oryza sativa L.), was developed by the rice breeding team of National Yeongnam Agricultural Experiment Station (NYAES) in 1999 and released in 2000. This variety originated from a three way cross

Analysis of Carbonization Behavior of Hydrochar Produced by Hydrothermal Carbonization of Lignin and Development of a Prediction Model for Carbonization Degree Using Near-Infrared Spectroscopy(열수 탄화 공정을 거친 리그닌 하이드로차(hydrochar)의 탄화 거동 분석과 근적외선 분광법을 이용한 예측 모델 개발)

( Un Taek Hwang ),( Junsoo Bae ),( Taekyeong Lee ),( Sung-yun Hwang ),( Jong-chan Kim ),( Jinseok Park ),( In-gyu Choi ),( Hyo Won Kwak ),( Sung-wook Hwang ),( Hwanmyeong Yeo ) 한국목재공학회 2021 목재공학 Vol.49 No.3

In this paper, we investigated the carbonization characteristics of lignin hydrochar prepared by hydrothermal carbonization and established a model for predicting the carbonization degree using near-infrared spectroscopy and partial least squares regression. The carbon content of the hydrothermally carbonized lignin at the temperature of 200 ℃ was higher by approximately 3 wt% than that of the untreated sample, and the carbon content tended to gradually increase as the heating time increased. Hydrothermal carbonization made lignin more carbon-intensive and more homogeneous by eliminating the microparticles. The discriminant and predictive models using near-infrared spectroscopy and partial least squares regression approppriately determined whether hydrothermal carbonization has been applied and predicted the carbon content of hydrothermal carbonized lignin with high accuracy. In this study, we confirmed that we can quickly and nondestructively predict the carbonization characteristics of lignin hydrochar manufactured by hydrothermal carbonization using a partial least squares regression model combined with near-infrared spectroscopy. 본 논문에서는 열수 탄화(hydrothermal carbonization)에 의해 제조된 리그닌 하이드로차의 탄화 특성을 조사하였고, 근적외선 분광법과 부분 최소 제곱(partial least squares) 회귀를 이용하여 탄화 거동을 예측하기 위한 모델을 수립하였다. 온도 200℃에서 열수 탄화된 리그닌의 탄소 함량은 무처리 시료 보다 약 3 wt% 높았으며 가열 시간이 증가할수록 탄소 함량도 서서히 증가하는 경향이 나타났다. 열수 탄화는 리그닌을 더욱 탄소 집약적으로 변화시키고 마이크로 파티클을 제거하여 더욱 균질한 특성을 부여하였다. 근적외선 분광법과 부분 최소 제곱 회귀를 이용한 판별 및 예측 모델은 수열 탄화의 적용 여부를 완벽히 구분했으며 높은 정확도로 열수 탄화 리그닌의 탄소 함량을 예측하였다. 본 연구로부터 근적외선 분광법과 결합된 부분 최소 제곱 회귀 모델을 이용하여 열수 탄화에 의해 제조된 리그닌 하이드로차의 탄화 특성을 빠르고 비파괴적으로 예측할 수 있다는 것이 확인되었다.

Mortality and Early Growth of Q. acuta Seedlings Response to Thinning on Natural Quercus acuta Stands in Wando, Jeonnam Province

( Un Sang Yeo ),( Don Koo Lee ) 한국산림과학회 2004 한국산림과학회지 Vol.93 No.6

N/A For sustainable management of Quercus acuta stands, it is important to know how forest practice affects on natural regeneration of Q. acuta. Thinning is one of the most effective management techniques for forest improvement and successful natural regeneration. This study was carried out to examine the response of mortality and early growth of Q. acuta seedlings in natural Q. acuta stands in Wando, Jeonnam Province. Mortality of Q. acuta seedlings showed different patterns between natural unthinned Q. acuta and thinned Q. acuta stands. In the thinned stand, mortality of seedlings differed significantly among different height and diameter classes, higher mortality was shown at lower height and root collar diameter classes. However, similar mortality was observed in unthinned Q. acuta stand in all classes. Mean height and root collar diameter of total Q. acuta seedlings increased for three to four years after thinning and then slightly decreased in 2003 and 2004. But, advance regeneration continuously increased and upper 10% height class rapidly increased. In unthinned stand, higher absolute growth rate(AGR) and relative growth rate(RGR) of root collar diameter and height were shown at lower height and root collar diameter classes. On the other hand, AGR increased with tree size and RGR was relatively constant among trees of different classes except the lowest class in thinned stand.

Event Processing Performance of KIAF Based on PROOF

Sang Un Ahn,Il-Yeon Yeo,Jeewon Seo 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.12

Managing and processing the large scale of data is the crucial part of the experimental high energy physics which uses a gigantic instrument in order to exploit the world’s largest particle accelerator at CERN. The WLCG has enabled the distributed computing technology, which is called the grid, and has proven its excellent performance by contributing their capability of data management and processing. In addition to the grid computing, a compact but powerful computing facility introducing the parallelism is designed. In this paper, we introduce the KIAF cluster which is designed to process large scale of data produced from the ALICE experiment at CERN LHC in parallel based on PROOF. The PROOF enables parallelism on a Linux cluster by exploiting the special characteristic of the data produced in high energy physics. Event processing performance, the number of event processed per second and the size of data processed per second, of the KIAF cluster is shown with the practical use case for the high energy physics. The performance of the KIAF shows pseudo-linearity increasing as the number of workers involved in the processing while it shows as well an evidence of the upper limitation of the scalability of PROOF cluster in terms of the performance.

Analysis on the Performance of CVMFS in KISTI-GSDC ALICE System

Yeo, Il-Yeon,Ahn, Sang-Un,Park, Sang Oh,Yoon, Hee-Jun Global Vision Press 2015 International Journal of Software Engineering and Vol.9 No.11

The Effects of Depth and Duration of Seed Burial on Dormancy, Germination and Viability of Chinese Milk Vetch(Astragalus sinicus L.) in Rice Field

Sang-Yeol Kim,Woon-Ha Hwang,Sung-Hwan Oh,Jong-Hee Lee,Jun-Hyeon Cho,Kuk-Hyun Jeong,Ji-Yoon Lee,Sung-Tae Park,You-Chun Song,Un-Sang Yeo,Jeong-Il Kim,Hang-Won Kang 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04

Experiments were conducted to investigated the change of primary dormancy and viability of Chinese milk vetch(CMV) seed buried in soil both as seed and pod with seeds under CMV-rice cropping system during the period of 2007~2009. The freshly harvested CMV seed alone and pods with seeds were buried in rice field at 0, 5 and 10cm depths and determined change of seed dormancy and viability at one to three month intervals for 10 months. The CMV seed had high dormancy of 95%, showing only 4~5% germination at the beginning in June but the seed dormancy was gradually broken at rice harvest time in autumn, showing 25 to 35% for seed and 55 to 61% for pod with seeds. The viability loss was faster in the seed than in the pod with seeds regardless of depths of placement in the soil base on decayed seeds. Also the seed placed on the soil surface lost viability faster than the 5~10 burial depths. However, appreciable number of CMV seeds still remained at even 4 months after burial in soil. These results indicate that seed dormancy was enable CMV plant to regenerate naturally from the remained soil seed bank at rice harvest time in autumn.

Germination Characteristics of Photoblastic Weedy Rice (Oryza sativa L.) Seed

Sang Yeol Kim(김상열),Sun Joo Hwang(황선주),In Jung Lee(이인중),Dong Hyun Shin(신동현),Sung Tae Park(박성태),Un Sang Yeo(여운상),Hang Won Kang(강항원) 韓國雜草學會 2009 Weed&Turfgrass Science Vol.29 No.4

광발아성을 가진 것으로 추정되는 검은색 종피 잡초성 벼의 발아 특성을 구명하며 잡초성벼 방제의 기초자료로 제공하고자 백색광, R 및 FR광에 따른 발아특성, 종피의 영향 및 암흡습으로 인한 2차 휴면특성을 조사하였다. 광발아성 추정 잡초성 벼의 발아율은 광조건에서 100%이었으나 암조건에서는 6%로 낮았고 R광 처리시 발아율이 증가하였으며 R광 처리후 FR광 처리시 발아율이 감소하였다. 또 R광과 FR광 혼합처리시 혼합횟수에 관계없이 마지막 광이 R이면 발아가 촉진되었고 FR이면 발아가 억제되어 검은색 종피 잡초성벼는 광발아성 종자임이 확인되었다. 또 종피를 제거했을 경우 광발아성 특성을 나타내지 않았고, 종자를 암상태에서 수분을 흡수시킬 경우 2차 휴면으로 인해 발아율이 낮아졌는데 2차 휴면 정도는 암흡습 기간이 길수록 증가되어 5일 이후에는 발아율이 1% 이하로 낮았다. The effects of different light qualities on the germination characteristics of a newly-discovered black-hulled weedy rice line that shows photoblastism was evaluated. In addition, the effects of rice hull and dark imbibition duration on germination was also studied. The germination percentage under white light was greater than 98% and less than 6% in darkness, indicating that the black-hulled weedy rice sees as positively photoblastic. While red light (R) stimulated germination, the germination was lower than in the white light treatment and the germination percentage of the seeds exposed to far-red light (FR) was similar to those maintained in darkness. The exposure to R for 30 sec. increased germination and this effect was saturated at an exposure of 15 min. The R effect was reversed by subsequent exposure to FR. Phytochrome control of the photoblastic weedy rice seed germination was confirmed by R/FR reversibility. The removal of the hull restored seed germination completely even in dark condition. Non-dormant weedy rice seeds imbibed in the dark enter a deep secondary dormancy, the depth of which was positively related to the duration of imbibition period. These results show that the black-hulled weedy rice seeds exhibit phytochrome-meditated photoblasticity, hull-imposed dormancy and secondary dormancy.

Metabolomic analysis reveals the interaction of primary and secondary metabolism in white, pale green, and green pak choi (Brassica rapa subsp. chinensis)

Yeo Hyeon Ji,Baek Seung-A,Sathasivam Ramaraj,Kim Jae Kwang,Park Sang Un 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.1

This study aimed to comprehensively analyze primary and secondary metabolites of three different-colored (white, pale green, and green) pak choi cultivars (Brassica rapa subsp. chinensis) using gas chromatography attached with time-of-flight mass spectrometry (GC-TOFMS) and high-performance liquid chromatography (HPLC). In total, 53 primary metabolites were identified and subjected to partial least-squares discriminant analysis. The result revealed a significant difference in the primary and secondary metabolites between the three pak choi cultivars. In addition, 49 hydrophilic metabolites were detected in different cultivars. Total phenolic and glucosinolate contents were highest in the pale green and green cultivars, respectively, whereas total carotenoid and chlorophyll contents were highest in the white cultivar. Superoxide dismutase activity, 2,2-diphenyl-1-picrylhydraz scavenging, and reducing power were slightly increased in the white, pale green, and green cultivars, respectively. In addition, a negative correlation between pigments and phenylpropanoids was discovered by metabolite correlation analysis. This approach will provide useful information for the development of strategies to enhance the biosynthesis of phenolics, glucosinolates, carotenoids, and chlorophyll, and to improve antioxidant activity in pak choi cultivars. In addition, this study supports the use of HPLC and GC-TOFMS-based metabolite profiling to explore differences in pak choi cultivars.

A New Rice Variety Adaptable to Late Planting with High Quality, "Mananbyeo"

Sang Jong Lim,Jong Rae Kang,Byong Geun Oh,No Bong Park,Un Sang Yeo,Sae Jun Yang,Ho Yeong Kim,Hung Goo Hwang,Yon Cheon Song,Do Yeon Kwark,Woon Goo Ha,Jae Ki Chang,Jeom Sig Lee 한국육종학회 2003 한국육종학회지 Vol.35 No.1

Mananbyeo was developed from a three way cross ilyang110/Yeongdeog7//Milyang110 in 1999. It has short growing duration about 71 days from seeding to heading and short culm length of 75 cm. It has almost similar number of panicles per hill , spikelets per