박달나무의 반형매 가계간 Cd Phytoremediation과 축적 특성

오창영,이재천,한심희,김판기 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.3

The main purpose of this study was to select a B. schmidtii population which has high cadmium tolerance and remediation and to determine the difference of cadmium uptake patterns among populations. One-year-old B. schmidtii seedlings were treated with 0, 0.4, 0.8mM CdSO₄ *3/8H₂O for two months. Cadmium concentrations in different positions of stem and cadmium concentrations and contents of leaves, stems and roots were analyzed. Also soil cadmium concentrations were analyzed. B. schmidtii was highest in root and lowest in shoot tip, showing a gradual decrease from root to shoot tip. The shoot to root Cd concentration ratios were over 1.26. It is concluded that B. schmidtii has good potential for phytoextraction as a shoot accumulator, which can be used for remediation of cadmium-contaminated areas. But tolerance differs between populations. Therefore B. schmidtii should be used as a means of phytoremediation after selection for Cd tolerance is performed.

테스트 그룹을 기반으로한 SRGM의 구현

김정종,이창희,하경재,한판암 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.3

소프트웨어 개발중에 테스트는 단위 및 통합 테스트는 개발 점검팀(Development Test Team), 확인 및 시스템 테스트는 독립 점검팀(Independent Test Team), 인수 테스트는 인수 점검팀(Customer Test Team)에 의해 수행된다. 그런데 테스트 그룹별로 테스트 수행방법, 절차, 도구, 노력, 요원 등이 서로 다르게 적용되고 있다. 이상과 같은 특징을 고려하여 본 논문에서는 소프트웨어 테스트 단계에서 테스트를 수행하는 테스트 그룹을 기반으로한 SRGM(Software Reliability Growth Model: 소프트웨어 신뢰도 성장 모델)을 제안한다. 그리고 실제 관측된 데이터를 기존의 지연 S자형 SRGM과 본 논문에서 제안한 테스트 그룹형 SRGM을 적용하게 위하여 최우 추정법에 의한 파라미터를 추정하고, 코무로고루프·스미루노프(Kolmogorov-Smirrnov : K-S)검정법으로 모델의 적합도 검정을 수행했다. 그리고 평균치 함수, 기대 잔존 결함수 및 소프트웨어 신뢰도를 추정하여 그 결과를 비교·분석했다. 그 결과 테스트 그룹형SRGM이 실제 데이터에 더 적합한 것으로 나타났다. Unit and integration test, validation and system test, and delivery test is performed by development test team, independent test team, and customer test team respectively in the development of software. Testing methods, procedures, tools, efforts, and man-power differ depending on the test groups. This paper proposes SRGM(Software Reliability Growth Model) based on test groups considering the above characteristics. The parameters are estimated by maximum-likelihood estimation method for the data to be applied th delayed S-shaped SRGM and test group based SRGM. The goodness-of-fit of two models is measured by Kolmogorov-Smirrnov test method. The results are analyzed and compared by estimating mean value function, expected number of remaining errors, and software reliability. The result shows that test group SRGM is fitter than delayed S-shaped SRGM for real data.

CO2 농도 및 기온 상승에 대한 현사시나무의 광합성 반응

이솔지 ( So Lji Lee ),오창영 ( Chang Young Oh ),한심희 ( Sim Hee Han ),김기우 ( Ki Woo Kim ),김판기 ( Pan Gi Kim ) 한국농림기상학회 2014 한국농림기상학회지 Vol.16 No.1

지구온난화와 같은 기후변화에 적응력이 높은 조림수종을 탐색하는 연구의 일환으로 CO2농도 및 기온 상승이 현사시나무의 광합성생리에 미치는 영향을 조사하였다. 그 결과 현사시나무는 CO2농도 및 기온 상승에 의해서 줄기의 신장생장이 억제되고 광합성 능력이 저하되었다. 그리고 광합성능력과 관련된 색소(엽록소a, b, 카로티노이드)의 함량이 감소하였다. 특히 탄소고정계의 활성과 관련된 엽록소a의 감소가 현저하게 나타났다. 그리고 광-광합성곡선과 A-Ci곡선에서 광화학계의 활성을 나타내는 순양자수율이 7%, 전자전달속도가 14% 감소하고, 탄소고정계의 활성을 나타내는 탄소고정효율이 52%, 재인산화속도가 24% 감소하였다. 이러한 결과로 CO2농도 및 기온 상승에 의한 현사시나무의 광합성능력 저하는 광화학계 및 탄소고정계의 활성저하에 기인하나, 탄소고정계의 활성저하가더 크게 작용하였음을 알 수 있다. This study was conducted to investigate the photosynthetic characters of Populus alba×glandulosa cuttings in response to elevated CO2 concentration and air temperature for selecting tree species adaptive to climate change. The cuttings were grown in environment controlled growth chambers with two combinations of CO2 concentration and air temperature conditions: (1) 22℃ + CO2 380 μmol mol.1 (control) and (2) 27℃ + CO2 770 μmol mol.1 (elevated) for almost three months. The cuttings under the elevated treatment showed reduced tree height and photosynthetic pigment contents such as chlorophyll and carotenoid. In particular, the elevated treatment resulted in a marked reduction in the chlorophyll a closely associated with CO2 fixative reaction system. Different levels of reduction in photosynthetic characters were found under the elevated treatment. A decrease was noted in photochemical reaction system parameters: net apparent quantum yield (7%) and photosynthetic electron transport rate (14%). Moreover, a significant reduction was obvious in CO2 fixative reaction system parameters: carboxylation efficiency (52%) and ribulose-1,5-bisphosphate(RuBP) regeneration rate (24%). These results suggest that the low level of photosynthetic capacity may be attributed to the decreased CO2 fixative reaction system rather than photochemical reaction system.

CO2 농도 및 기온 상승이 현사시나무의 수분생리 특성에 미치는 영향

이솔지 ( Sol Ji Lee ),한심희 ( Sim Hee Han ),오창영 ( Chang Young Oh ),김기우 ( Ki Woo Kim ),김판기 ( Pan Gi Kim ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-

기후변화에 적응력이 높은 조림수종을 탐색하기 위하여 CO2 농도 및 기온 상승이 현사시나무의 수분생리에 미치는 영향을 조사하였다. 현사시나무는 CO2 농도 및 기온이 상승된 조건에서 엽량 및 엽면적이 감소하였고, 섬모의 엽면 피복도가 현격하게 증가하였다. 또한, 기공전도도 및 증산속도는 낮은 값을 유지하였으며, 광도 및 CO2 농도 상승에 따른 변화가 거의 나타나지 않았다. 이로써 처리구의 수분이용효율 및 상태함수율은 대조구에 비해 높은 값을 가질 수 있었다. 이러한 결과로부터 CO2 농도 및 기온 상승된 조건에서 현사시나무는 엽면경계층과 기공저항의 증가로 수분손실을 억제하는 능력이 뛰어남을 알 수 있었다. 현사시나무는 수분스트레스에 대한 높은 가소성과 조직의 형태를 변화시키는 기작으로 기후변화 환경에 적응하고 있는 것으로 사료된다. This study was conducted to investigate the water physiology characters of Populus alba× glandulosa cuttings in response to elevated CO2 concentration and air temperature for selecting tree species adaptive to climate change. The poplars under the elevated treatment showed a decrease in the leaf number and area, compared with those under the ambient condition. Having denser leaf hairs, the poplars under the treatment maintained lower stomatal conductance and slower transpiration rate. These results indicate that increased leaf boundary layer and stomatal resistance of poplars under elevated treatment allowed higher water use efficiency and water retentivity. The phenotypic plasticity of leaves in response to water stress would probably enable the poplars to cope with possible climate change conditions.

CO₂ 농도 및 기온 상승에 대한 현사시나무의 광합성 반응

이솔지,오창영,한심희,김기우,김판기,Lee, Solji,Oh, Chang-Young,Han, Sim-Hee,Kim, Ki Woo,Kim, Pan-Gi 한국농림기상학회 2014 한국농림기상학회지 Vol.16 No.1

지구온난화와 같은 기후변화에 적응력이 높은 조림수종을 탐색하는 연구의 일환으로 $CO_2$농도 및 기온상승이 현사시나무의 광합성생리에 미치는 영향을 조사하였다. 그 결과 현사시나무는 $CO_2$농도 및 기온 상승에 의해서 줄기의 신장생장이 억제되고 광합성 능력이 저하되었다. 그리고 광합성능력과 관련된 색소(엽록소a, b, 카로티노이드)의 함량이 감소하였다. 특히 탄소고정계의 활성과 관련된 엽록소a의 감소가 현저하게 나타났다. 그리고 광-광합성곡선과 A-Ci곡선에서 광화학계의 활성을 나타내는 순양자수율이 7%, 전자전달속도가 14% 감소하고, 탄소고정계의 활성을 나타내는 탄소고정효율이 52%, 재인산화속도가 24% 감소하였다. 이러한 결과로 $CO_2$농도 및 기온 상승에 의한 현사시나무의 광합성능력 저하는 광화학계 및 탄소고정계의 활성저하에 기인하나, 탄소고정계의 활성저하가 더 크게 작용하였음을 알 수 있다. This study was conducted to investigate the photosynthetic characters of Populus alba${\times}$glandulosa cuttings in response to elevated $CO_2$ concentration and air temperature for selecting tree species adaptive to climate change. The cuttings were grown in environment controlled growth chambers with two combinations of $CO_2$ concentration and air temperature conditions: (i) $22^{\circ}C$ + $CO_2$ 380 ${\mu}mol$ $mol^{-1}$ (control) and (ii) $27^{\circ}C$ + $CO_2$ 770 ${\mu}mol$ $mol^{-1}$ (elevated) for almost three months. The cuttings under the elevated treatment showed reduced tree height and photosynthetic pigment contents such as chlorophyll and carotenoid. In particular, the elevated treatment resulted in a marked reduction in the chlorophyll a closely associated with $CO_2$ fixative reaction system. Different levels of reduction in photosynthetic characters were found under the elevated treatment. A decrease was noted in photochemical reaction system parameters: net apparent quantum yield (7%) and photosynthetic electron transport rate (14%). Moreover, a significant reduction was obvious in $CO_2$ fixative reaction system parameters: carboxylation efficiency (52%) and ribulose-1,5-bisphosphate(RuBP) regeneration rate (24%). These results suggest that the low level of photosynthetic capacity may be attributed to the decreased $CO_2$ fixative reaction system rather than photochemical reaction system.

교애사물탕이 랫드의 모체와 태자에 미치는 영향에 대한 연구

김창석,박해모,신헌태,이장우,김경태,김판기,이선동,한상백,한용주,Kim, Chang-Seok,Park, Hae-Mo,Shin, Hun-Tae,Lee, Jang-Woo,Kim, Kyung-Tae,Kim, Pan-Gyi,Lee, Sun-Dong,Han, Sang-Baek,Hahn, Yong-Joo 대한예방한의학회 2006 대한예방한의학회지 Vol.10 No.2

This study was undertaken to investigate the effects of Gyoaesamultang in pregnant rats and their fetuses. Female Sprague-Dawley rats were orally administered with the Gyoaesamultang at dose of 5mg/kg/day for 20 days. Pregnant rats were sacrificed at 20th day of gestation, and observed internal and reproductive organs. Approximately, live fetuses in the 20th day of gestation were randomly selected and fixed in 95% ethanol. To observe skeletal malformations, fetuses were stained with alcian blue and alizarin red S. Maternal body weight of Gyoaesamultang treated group has a tendency to increase compared to that of control group. There were no significant difference in internal and reproductive organs. There were no significant changes between two groups in blood chemistry and hematological values. There were no significant changes in number of corpus luteum, implantation, live fetuses and implantation rate, delivery rate, late resorption rate and sex ratio. But Gyoaesamultang administered group showed lower early resorption rate than the control group. Neonatal body weight and number of fetus of Gyoaesamultang group were increased to that of control group. The fetuses of dams treated with Gyoaesamultang didn't showed external malformation. Vertebral and sternal variations were observed in Gyoaesamultang group but, compared to the control, those variations were insignificant. The number of ribs, cervical, thoracic, and lumber were normal. The number of sacral and caudal vertebrae were increased. Fetuses treated with Gyoaesamultang showed significant difference in the number of caudal vertebra(P<0.01). From these results, it can be concluded that Gyoaesamultang showed no toxicity effects on maternal body weight, early resorption rate, and number of live fetuses. There were no significant changes in organ weight, hematological data, reproductive organs. Although skeletal variations were showed in vertebrate and sternum, Gyoaesamultang were shown insignificant changes in bone malformation.

Shape Optimization of a Large-Scale BLDC Motor Using an Adaptive RSM Utilizing Design Sensitivity Analysis

Pan Seok Shin,Han-Deul Kim,Gyo-Bum Chung,Hee Sung Yoon,Gwan-Soo Park,Chang Seop Koh IEEE 2007 IEEE transactions on magnetics Vol.43 No.4

<P>This paper proposes a new algorithm for the shape optimization of a large-scale brushless dc (BLDC) motor to reduce the cogging torque. In the algorithm, an adaptive response surface method (RSM) using the multiquadric radial basis function is employed to interpolate the objective function in design parameter space, and incorporated with (1+1) evolution strategy to find an optimal point. In the adaptive RSM, an adaptive sampling point insertion method is developed utilizing the design sensitivities computed by using the finite-element method to get a reasonable response surface with a relatively small number of sampling points. The developed algorithm is applied to the shape optimization of a 5-MW BLDC motor, and the cogging torque was reduced to 17% of the initial one</P>

Automated Measurement of Native T1 and Extracellular Volume Fraction in Cardiac Magnetic Resonance Imaging Using a Commercially Available Deep Learning Algorithm

Chang Suyon,Han Kyunghwa,Lee Suji,Yang Young Joong,Kim Pan Ki,Choi Byoung Wook,서영주 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.12

Objective: T1 mapping provides valuable information regarding cardiomyopathies. Manual drawing is time consuming and prone to subjective errors. Therefore, this study aimed to test a DL algorithm for the automated measurement of native T1 and extracellular volume (ECV) fractions in cardiac magnetic resonance (CMR) imaging with a temporally separated dataset. Materials and Methods: CMR images obtained for 95 participants (mean age ± standard deviation, 54.5 ± 15.2 years), including 36 left ventricular hypertrophy (12 hypertrophic cardiomyopathy, 12 Fabry disease, and 12 amyloidosis), 32 dilated cardiomyopathy, and 27 healthy volunteers, were included. A commercial deep learning (DL) algorithm based on 2D U-net (Myomics-T1 software, version 1.0.0) was used for the automated analysis of T1 maps. Four radiologists, as study readers, performed manual analysis. The reference standard was the consensus result of the manual analysis by two additional expert readers. The segmentation performance of the DL algorithm and the correlation and agreement between the automated measurement and the reference standard were assessed. Interobserver agreement among the four radiologists was analyzed. Results: DL successfully segmented the myocardium in 99.3% of slices in the native T1 map and 89.8% of slices in the post-T1 map with Dice similarity coefficients of 0.86 ± 0.05 and 0.74 ± 0.17, respectively. Native T1 and ECV showed strong correlation and agreement between DL and the reference: for T1, r = 0.967 (95% confidence interval [CI], 0.951–0.978) and bias of 9.5 msec (95% limits of agreement [LOA], -23.6–42.6 msec); for ECV, r = 0.987 (95% CI, 0.980–0.991) and bias of 0.7% (95% LOA, -2.8%–4.2%) on per-subject basis. Agreements between DL and each of the four radiologists were excellent (intraclass correlation coefficient [ICC] of 0.98–0.99 for both native T1 and ECV), comparable to the pairwise agreement between the radiologists (ICC of 0.97–1.00 and 0.99–1.00 for native T1 and ECV, respectively). Conclusion: The DL algorithm allowed automated T1 and ECV measurements comparable to those of radiologists.

오존 노출 시간에 따른 버즘나무와 백합나무의 광합성과 SOD 활성 변화

이재천 ( Jae Cheon Lee ),오창영 ( Chang Young Oh ),한심희 ( Sim Hee Han ),김판기 ( Pan Gi Kim ) 한국농림기상학회 2005 한국농림기상학회지 Vol.7 No.2

Adaptation of Betula schmidtii Seedling in Coal-mine Field with Different Sewage Sludge Treatment Methods

Han, Sim-Hee,Lee, Jae-Cheon,Oh, Chang-Young,Kim, Pan-Gi The Ecological Society of Korea 2005 Journal of Ecology and Environment Vol.28 No.4

We tested the field adaptation of Betula schmidtii on the abandoned coal-mine soil with sludge amendment methods for promoting physiological activity of B. schmidtii seedlings under several environmental stress. Sewage sludges were amended to coal-mine soil with B. schmidtii seedlings which grown in the mixture of artificial soil and composted sludge soil before transplanting (before-fertilized treatment, BF) and fertilized with composted sludge after transplanting (after-fertilized treatment, AF). The percent of establishment of seedlings for AF (80.7%) was lower than that for BF (92.7%). Nitrate reductase activity and photosynthetic pigment content were higher in AF than in BF, but malondialdehyde (MDA) content and superoxide dismutase (SOD) activity were lower in AF than in BF These results represent that after-fertilized seedlings increase resistance against physiological stress at field condition using nitrogen source of composted sludge. On the contrary, before-fertilized seedlings were susceptible to environmental stress on abandoned coal-mine soil by exhausting of nitrogen source from composted sludge.