Interaction between Potassium and Ozone in Biomass Production and Resistance to Ozone of Potted-cuttings of Populus trichocarpa and P. trichocarpa x deltoides

이경준,김태유 한국산림과학회 2009 Forest Science And Technology Vol.5 No.1

This study examined the effects of potassium on the growth of poplars under the influence of ozone as well as their resistance to ozone. Two clones of poplar, Populus trichocarpa (Pt) and P. trichocarpa x deltoides (Ptd) were propagated by cuttings in pots supplied with a nutrient solution containing either 0 (No-K), 25 (Low-K), or 235 ppm K (High-K). The plants were exposed to ozone in open-top chambers at 100 to 110ppb ozone for four hours per day over a nine week period. Water stress was imposed during the last four weeks of ozone exposure. When the irrigated and water-stressed data were pooled for Pt, the High-K group showed a 50%, 43%, and 43% reduction of root, shoot and total dry weight, respectively, after exposure to ozone. The ozone-induced decrease in total dry weight of Pt increased with increasing potassium levels from 10% in the No-K group to 43% in the High-K group, indicating an interaction between potassium and ozone. The two poplar clones with the higher K treatment contained more K in the leaves and showed less visible leaf damage than those with the lower K treatments. The higher resistance to ozone in the higher K treatment could not be explained by the stomatal behavior because the stomatal conductance was similar in the three K treatments. This suggests that plants treated with higher K levels allocate more energy to leaf-level defense against ozone than to growth.

Estimation of the exponential distribution based on multiply Type I hybrid censored sample

이경준,선호근,조영석 한국데이터정보과학회 2014 한국데이터정보과학회지 Vol.25 No.3

The exponential distibution is one of the most popular distributions in analyzing the lifetime data. In this paper, we propose multiply Type I hybrid censoring. And this paper presents the statistical inference on the scale parameter for the exponential distribution when samples are multiply Type I hybrid censoring. The scale parameter is estimated by approximate maximum likelihood estimation methods using two different Taylor series expansion types (AMLEI, AMLEII). We also obtain the maximum likelihood estimator (MLE) of the scale parameter sigma under the proposed multiply Type I hybrid censored samples. We compare the estimators in the sense of the root mean square error (RMSE). The simulation procedure is repeated 10,000 times for the sample size n=20 and 40 and various censored schemes. The AMLEII is better than AMLEI in the sense of the RMSE.

Exact likelihood inference of the exponential parameter under generalized Type II progressive hybrid censoring

이경준,선호근,조영석 한국통계학회 2016 Journal of the Korean Statistical Society Vol.45 No.1

Type II progressive hybrid censoring schemes (PHCS) have become quite popular in reliability and lifetime-testing studies. However, the drawback of the Type II PHCS is that it might take a very long time in order to complete the life test. In this article, we propose generalized Type II PHCS which provide a guarantee of the time to complete the life test. Also, we consider both exact and approximate inferential procedures based on generalized Type II PHCS when the lifetime distribution of the test items follows an independent and identically distributed (iid) exponential distribution. Given by the exact conditional first moment, bias adjusted MLE is proposed and its distribution is discussed. The results of simulation studies and real data analysis were conducted to evaluate the performance of the proposed method.

Determination of Heterocyclic Amines and Acrylamide in Agricultural Products with Liquid Chromatography-Tandem Mass Spectrometry

이경준,이계호,김해솔,오민석,추석,황인주,이지연,최아리,김초일,박현미 한국독성학회 2015 Toxicological Research Vol.31 No.3

Heterocyclic amines (HCAs) and acrylamide are unintended hazardous substances generated by heating or processing of foods and are known as carcinogenic and mutagenic agents by the animal experiments. A simple method was established for a rapid and accurate determination of 12 types of HCAs (IQ, MeIQ, Glu-P-1, Glu-P-2, MeIQx, Trp-P-1, Trp-P-2, PhIP, AαC, MeAαC, Harman and Norharman) and acrylamide in three food matrices (non-fat liquid, non-fat solid and fat solid) by isotope dilution liquid chromatography- tandem mass spectrometry (LC-MS/MS). In every sample, a mixture of internal standards including IQ-d3, MeIQx-d3, PhIP-d3, Trp-P-2-13C2-15N and MeAαC-d3 was spiked for quantification of HCAs and 13C3-acrylamide was also spiked for the analysis of acrylamide. HCAs and acrylamide in sample were extracted with acetonitrile and water, respectively, and then two solid-phase extraction cartridges, ChemElut: HLB for HCAs and Accucat: HLB for acrylamide, were used for efficiently removing interferences such as pigment, lipid, polar, nonpolar and ionic compounds. Established method was validated in terms of recovery, accuracy, precision, limit of detection, limit of quantitation, and linearity. This method showed good precision (RSD < 20%), accuracy (71.8~119.1%) and recovery (66.0~118.9%). The detection limits were < 3.1 ng/g for all analytes. The correlation coefficients for all the HCAs and acrylamide were > 0.995, showing excellent linearity. These methods for the detection of HCAs and acrylamide by LC-MS/MS were applied to real samples and were successfully used for quantitative monitoring in the total diet study and this can be applied to risk assessment in various food matrices.

Hemoglobin Powder as a Dietary Animal Protein Source for Juvenile Nile Tilapia

이경준 釜山水産大學校 海洋産業開發硏究所 1998 硏究業績集 Vol.1997 No.-

데이터 경제와 정보보호 관리·감독제도의 개선에 대한 검토

이경준,김현경 경북대학교 IT와 법연구소 2020 IT와 법 연구 Vol.0 No.21

Since the "4th Industrial Revolution" has been a big issue today, the importance and public attention regarding data also has increased. In addition, activities that create new values while acting as catalysts for the development of other industries by using various types of data are called “Data economy” or “Data industry”. And many policies are also being designed to support them. While Korean government implements various policies that consider the use of data to promote the data economy and industry, it also operates systems to prevent infringement accidents and minimize information leakage damage. However, the financial institutions that caused large-scale personal information leakage accidents are excluded from the subject of the Inforamation Security Management System (ISMS) certification obligations, and domestic universities have refused the certification review. In addition, in the case of the information protection (voluntary) disclosure system, no companies participated for a year since the implementation was insignificant. Even in public institutions that need to take the initiative in protecting personal information, cases of unauthorized access and leakage of personal information are constantly being occured. And cryptocurrency exchanges where data itself is converted into cashable assets have been hacked. In this era of data economy and industry, the demand for information security management and supervision system is expected to gradually increase, it is expected that the level of social expectations for policy and system operation in this regard will also increase. In this paper, we first looked at the data economic environment and related trends, and examined the current status and limitations of the current information protection and management system. Afterwards, we tried to suggest some ways to improve the information protection, management, and supervision systems, and suggest directions to help secure the use of data in the future to meet the era of secured data economy.

Estimation for the half-logistic distribution based on generalized adaptive progressive hybrid censoring

이경준,박성희,조수빈 한국자료분석학회 2021 한국자료분석학회 학술대회자료집 Vol.2020 No.3

3. 소나무의 생장을 위한 Pisolithus tinctorius 균의 균근의 잠재력

이경준 한국균학회 1982 韓國菌學會誌 Vol.10 No.3

Ectomycorrhizae are common features of many forest trees and particularly pines do not grow normally without forming mycorrhizae in natural habitats. Recent advancement in mycorrhizal research suggests that plant growth can be stimulated by careful selection of fungal species and artificial inoculation of plants with the selected fungi. Two ectomycorrhizal fungi, Pisolithus tinctorius and Thelephora terrestris, were introduced from U.S.A. and inoculated to five pine species in Korea to evaluate the reported growth stimulation of host plants after inoculation. These fungi were grown as mycelial inoculum in large quantity and inoculated to the fumigated nursery soil just before seed sowing. At the end of the first growing season, Pisolithus stimulated the height growth of Pinus densiflora, P. thunbergii. P. rigida, and P. rigida × taeda by 55, 36, 69, and 37% respectively, compared with control seedlings (with no fumigation and no inoculation). When the growth stimulation was expressed with dry weight, Pisolithus increased dry weight of P. deasiflora and P. rigida × taeda by 143% and 128%, respectively, over control seedlings. Thelephora failed to stimulate growth of inoculated plants. Pinus koraiensis did not respond to the inoculation during the first growing season. Artificial inoculation also significantly stimulated phosphorus and nitrogen uptake of host plants. Inoculated plants contained 3.35㎎ P and 29.0㎎ N per plant top, while control plants (mycorrhizae formed by natural population of fungi) had 1.68㎎ P and 13.8㎎ N per plant top. However, there was no difference among treatments in concentration of P and N in the shoots. In the previous experiment mentioned above, the effect of Pisolithus tinctorius was not well shown in heavy soil. Therefore, subsequent experiment was conducted in the greenhouse using potted Pinus rigida × taeda to test the effectiveness of this fungus at different soil texture and soil fertility. The results of the experiment indicated that this fungus compared with naturally occurring fungi stimulated dry weight increase (at least two times) of the host giants regardless of soil texture and soil fertility. The Pisoliihus was effective in stimulation of both height growth and dry weight increase when host plants was grown in sandy soil, sandy loam, and loam with or without organic amendment. Stimulatory effect of the fungus was more prominently shown in sandy loam and loam which were not amended with organic, indicating that high fertility through organic amendment reduced the benefit of this. fungus in sandy loam and loam. However. organic amendment in sandy soil having low fertility increased dry weight of inoculated seedlings. After the successful use of introduced two super strains of mycorrhizal fungi, we are now testing effectiveness of Korea-native fungus of Pisolithus tinctorius. Basidiospores of U.S. and Korean Pisolithus were used as inocula in this. experiment. Preliminary that the super strain introduced from U.S.A. stimulated height growth of Pinus rigida × taeda more than Korean strain collected near Suweon. However it may be possible in the future to select better strains. of this fungus from natural populations of wide distribution in Korea to maximize the benefit of the symbiosis between the fungus and host plants.

MRI 방사선사의 자기장 노출과 건강영향

이경준,임가영,김호길,최관우,박동욱,송재철 대한직업환경의학회 2016 대한직업환경의학회 학술대회 논문집 Vol.2016 No.11

냉장고 외 1편

이경준 계간 서정시학 2019 서정시학 Vol.29 No.3