초음파 시험에 의한 자기유체의 탄성율 산정

김종희,김건우,김철기,이승구,구만회,Kim, Jong-Hee,Kim, Kun-Woo,Kim, Cheol-Gi,Lee, Seung-Goo,Koo, Man-Hoi 한국재료학회 2012 한국재료학회지 Vol.22 No.3

Magnetic nanoparticles for ferromagnetic fluids and magnetorheological fluids were prepared by chemical coprecipitation and mechanical milling, respectively. The surface-treated particles were dispersed at various weight ratios into a medium of polyethylene glycol. In order to evaluate the elastic modulus of the fluids, ultrasonic pulse velocities were measured with an ultrasonic test using transducers of 5MHz and 2.25MHz. The ultrasonic signals were only available with a transducer of 2.25 MHz at fluid concentrations of 5 mg/ml and lower. In the case of applying transducers over 2.25 MHz and concentrations over 5 mg/ml to the fluids, it was impossible to observe effective ultrasonic signals due to an excessive scattering of the pulses by the dispersed particles. Elastic moduli of the magnetorheological fluids were 5.44 GPa and 6.13 GPa with concentrations of 25 mg/ml and 50 mg/ml, respectively; these values were higher by 40% than the values of 4.04 GPa and 4.28 GPa of ferromagnetic fluids at the same concentrations. As for the effect of an external magnetic field on these dilute fluids, the ultrasonic signals were positioned in a very similar way, which was probably due to insufficient arrangement of the particles even though the reflection energy of the ultrasonic waves apparently increased.

토마토 MABC 육종에서 GBS(genotyping-by-sequencing)에 의한 RPG(recurrent parent genome) 회복률 분석

김종희,정유진,서훈교,김명권,노일섭,강권규,Kim, Jong Hee,Jung, Yu Jin,Seo, Hoon Kyo,Kim, Myong-Kwon,Nou, Ill-Sup,Kang, Kwon Kyoo The Korean Society of Plant Biotechnology 2019 식물생명공학회지 Vol.46 No.3

Marker-assisted backcrossing (MABC)은 marker-assisted selection (MAS)와 함께 다양한 작물에서 여교배 초기세대에서 반복친 게놈의 회복률이 높은 개체선발을 위한 분자육종 기술로 매우 유용하게 사용하고 있다. 본 연구에서는 토마토 MABC 육종 프로그램의 일환으로 저장성이 강한 rin유전자를 주)토마토연구소에서 육성한 핑크계 엘리트 토마토계통에 도입하고자 수행하였다. foreground 선발은 RIN SCAR 분자 마커를 이용하여 100개 $BC_1F_1$ 식물체에서 Rr 유전자형 가진 42개체를 선발하였다. 그리고 이를 이용하여 GBS 분석을 이용하여 background 선발을 하였다. 총 3,086개 SNP를 대상으로 반복친 HK13-1151과 게놈 회복률을 조사한 결과, 56.7%에서 84.5%를 보여 평균 70.5%로 나타났다. 이 중 87.2%을 보인 $BC_1F_1$개체를 이용하여 192개 $BC_2F_1$ 식물체를 육성하여 foreground 선발을 하였다. 선발된 102개 중 88개 식물체를 이용하여 GBS 분석을 수행한 결과 4,868개의 다형 SNP 마커를 얻었으며, 이를 이용하여 RPG 회복률을 조사하였다. $BC_2F_1$ 식물체들에서 HK13-1151 반복친 게놈과 87.8%에서 97.8% 유사하였다. 본 연구에서 $BC_2F_1$ 식물 중 RPG 회복률이 97.8%인 5-1 개체는 반복친인 HK13-1151과 과일특성에서 매우 유사하였다. 따라서 선발된 5-1 개체는 $BC_2F_2$ 세대를 육성하여 계통화 하고자 한다. 본 연구를 통해 MABC는 전통 여교배 육종에 비해 육종연한을 획기적으로 줄일 수 있으며, 원하는 육종모델을 완수할 수 있는 첨단육종 기술로 평가 할 수 있다. Marker-assisted backcrossing (MABC) is useful for selecting an offspring with a highly recovered genetic background for a recurrent parent at early generation to various crops. Moreover, marker-assisted backcrossing (MABC) along with marker-assisted selection (MAS) contributes immensely to overcome the main limitation of the conventional breeding and it accelerates recurrent parent genome (RPG) recovery. In this study, we were employed to incorporate rin gene(s) from the donor parent T13-1084, into the genetic background of HK13-1151, a popular high-yielding tomato elite inbred line that is a pink color fruit, in order to develop a rin HK13-1084 improved line. The recurrent parent genome recovery was analyzed in early generations of backcrossing using SNP markers obtained from genotyping-by-sequencing analysis. From the $BC_1F_1$ and $BC_2F_1$ plants, 3,086 and 4868 polymorphic SNP markers were obtained via GBS analysis, respectively. These markers were present in all twelve chromosomes. The background analysis revealed that the extent of RPG recovery ranged from 56.7% to 84.5% and from 87.8% to 97.8% in $BC_1F_1$ and $BC_2F_1$ generations, respectively. In this study, No 5-1 with 97.8% RPG recovery rate among $BC_2F_1$ plants was similar to HK13-1151 strain in the fruit shape. Therefore, the selected plants were fixed in $BC_2F_2$ generation through selfing. MAS allowed identification of the plants that are more similar to the recurrent parent for the loci evaluated in the backcross generations. MABC can greatly reduce breeding time as compared to the conventional backcross breeding. For instance, MABC approach greatly shortened breeding time in tomato.

직접 교수 모형에 기반한 체육과 ICT활용 교수 학습 과정안 개발 및 적용

김종희,이재무,Kim, Jong-Hee,Lee, Jae-Mu 한국정보교육학회 2005 정보교육학회논문지 Vol.9 No.3

The goal of this research is to prove the efficiency of direct instruction by developing and applying an ICT teaching and learning course for physical education based on a direct instruction model. The curriculum for physical education requires the instructors example and feedback, and sometimes classes may be difficult to conduct due to reasons such as weather conditions. Also, in actual learning, the application of a learning model is inadequate. In these cases, using an ICT teaching and learning course, experts can show examples instead. The learners are provided with individual and suitable feedback and can make it practical for them by slowing down motions, sectional motion learning, and repetitive learning. It can also enhance the sharing of the instructors teaching and learning methods. Therefore, this research recomposed the commonly used direct teaching and learning methods in physical education in order to make it suitable for ICT utilized lessons. It was recomposed in a procedural model and each level was explicated, and in order to materialize this, an ICT teaching and learning course was developed. This was then applied to a Fifth grade class, and its learning effects were analyzed.

자색고구마 스펀지케이크의 저장기간 변화에 따른 품질 특성

김종희,이근종,Kim, Jong-Hee,Lee, Kun Jong 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.4

The quality and characteristics of purple sweet potato sponge cake were studied with the addition of different proportions of purple sweet potato powder depending on storage period The pHs, heights, and weights of doughs were in the ranges of 6.3~6.5, 4.8~4.4 cm and 397~418 g, respectively. The sponge cake groups with the addition of different proportions of purple sweet potato powder showed significantly different characteristics in hardness, adhesiveness, cohesiveness, gumminess, and chewiness, according to texture profile analysis. The difference in colors of sponge cakes with addition with purple sweet potato revealed that L-value and b-value were significantly reduced but a-value especially increased according to the density. Using scanning electron microscopy (SEM), it was confirmed that the stoma size of purple sweet potato sponge cake become smaller and the stoma wall became thicker in proportion to the contents of purple sweet potato powder, which could result in an increased level of water content after a long period pf storage. According with the observations, water content remarkably increased after 4~6 days of storage and the ability to keep water content seemed to contribute to extention the shef-life of sponge cakes. In sensory evaluation, sponge cakes with high contents of purple sweet potato were preferred and cakes with the addition of 25% and 30% purple sweet potato powder was most preferred. It was expected that the shelf-life of purple sweet potato sponge cake was 4 days under the normal temperature.

연료극 지지체식 평관형 고체산화물 연료전지 특성 연구

김종희,송락현,Kim Jong-Hee,Song Rak-Hyun 한국전기화학회 2004 한국전기화학회지 Vol.7 No.2

Anode-supported flat tubular solid oxide fuel cell (SOFC) was investigated to increase the cell power density. The anode-supported flat tube was fabricated by extrusion process. The porosity and pore size of Ni/YSZ ($8mol\%$ yttria-stabilized zirconia) cermet anode were $50.6\%\;and\;0.23{\mu}m$, respectively. The Ni particles in the anode were distributed uniformly and connected well to each other particles in the cermet anode. YSZ electrolyte layer and multilayered cathode composed of $LSM(La_{0.85}Sr_{0.15})_{0.9}MnO_3)/YSZ$ composite, LSM, and $LSCF(La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.7}O_3)$ were coated onto the anode substrate by slurry dip coating, subsequently. The anode-supported flat tubular cell showed a performance of $300mW/cm^2 (0.6V,\; 500 mA/cm^2)\;at\;500^{\circ}C$. The electrochemical characteristics of the flat tubular cell were examined by ac impedance method and the humidified fuel enhanced the cell performance. Areal specific resistance of the LSM-coated SUS430 by slurry dipping process as metallic interconnect was $148m{\Omega}cm^2\;at\;750^{\circ}C$ and then decreased to $148m{\Omega}cm^2$ after 450hr. On the other hand, the LSM-coated Fecralloy by slurry dipping process showed a high area specific resistance. 연료극 지지체 평관형 고체산화물 연료전지(SOFC)의 셀 전력밀도를 증가시키기 위하여 압출법에 의하여 제조하고 그 특성을 연구하였다. 연료극 지지체로써 Ni/YSZ($8mol\%$ yttria stabilized zirconia) cermet는 기공율 $50.6\%,\;0.23{\mu}m$의 기공크기를 나타내었다. 지지체에서의 Ni의 분포는 균일하였으며 전자전도 경로로써의 Ni의 연결성은 양호하였다. 지지체에 YSZ전해질과 복합 공기극층인 $LSM((La_{0.85}Sr_{0.15})_{0.9}MnO_3)/YSZ$ 복합층, LSM, LSCF $(La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3)$층이 슬러리 디핑법에 의하여 코팅 및 소결된 연료극 지지체식 평관형 고체산화물 연료전지 단위전지의 성능은 $800^{\circ}C$에서 $300mW/cm^2(0.6V,\;500mA/cm^2)$의 성능을 나타내었다. 임피던스 분석에 의하여 평관형 셀의 전기화학적 분극저항을 평가하고 연료측의 가습에 따라 분극저항이 감소되어 성능이 향상됨을 알 수 있었다 슬러리 디핑법으로 LSM이 코팅된 SUS430 금속연결재를 $Ar+10\%\;H_2$에서 소결하였으며, $750^{\circ}C$에서 면저항의 측정할 결과, 초기에는 $148m{\Omega}cm^2$를 나타내었으며, 450시간 경과 후에 $43m{\Omega}cm^2$의 낮은 면저항을 유지하였다. 반면에 동일한 조건으로 LSM이 코팅된 Fecralloy는 높은 면저항을 나타내었다.

흰쥐에서 개량식 고추장과 발효 밀쌀의 항비만 효과

김종희,임양이,Kim, Jong-Hee,Lim, Yaung-Iee 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.4

The antiobesity effect of commercial kochujang and fermented wheat grains in Sprague-Dawley (SD) rats was studied. The experiment was consisted of 6 groups. Normal, high fat diet (HFD), HFD+raw wheat grains, HFD+first fermented wheat grains (FFWG, with Aspergillus oryzae) HFD+final fermented wheat grains (FiFWG, fermented more for 30~40 days), and HFD+ commercial kochujang. The results showed that final body weight, weight gain, food efficiency ratio, and adipose tissue weight were markedly decreased by the commercial kochujang and the fermented wheat grains, whereas non-fermented raw wheat grains had no such effect. Lipid contents such as total lipid, total triglyceride and total cholesterol decreased in the serum and organs of liver and adipose tissues by the commercial kochujang and the fermented wheat grains as well. These results also indicated that fermented wheat grains exhibited more suppressive effects on high fat induced-obesity than raw wheat grains. Increased fermentation time and adding the red pepper powder resulted in increased the anti-obesity effect. Especially, commercial kochujang showed higher antiobestic effects than fermented wheat grains. These in vivo findings suggested that well-fermented end products of the wheat grains and red pepper powder in kochujang could be useful in the prevention of obesity.

금융제약과 차주의 유형별 원리금 상환부담률간의 관계에 대한 연구

김종희(Kim, Jong-Hee) SH도시연구원 2019 주택도시연구 Vol.9 No.1

This study analyzes the impact of financial regulation, such as regulation of DTI (Debt to Income) on the mortgage market, by focusing on the relationship between loaner’s repayment burden and associated determinants. To measure this, this study examines factors associated with financial difficulties, using micro-level data of 35,000 loaners: loan-level securitised mortgage data, from the Korea Housing-Finance Corporation, 2011-2017. This study’s results based on empirical analysis, concluded the following: First, interest rates, house prices, and authorities’ financial regulations, are main factors of loan demand. Specifically, loan risk factors such as weighted average interest rates, monthly redemption, and external risk factors such as house prices and financial regulations, are main determinants of the loaner’s repayment burden. Second, the most sensitive factor of financial regulations, is the loan’ risk factor. The repayment burden of the loaner is worsening, under rising interest rates and redemption. Third, authorities’ financial regulations worsens the loaners’ repayment burden, and has strong impact on typical features of loaners. Specifically, such a tendency is much stronger regarding loaners belonging to high risk groups.

정부 간 재정이전과 지방세 수입 간의 경쟁적 관계에 대한 연구

김종희 ( Jong Hee Kim ) 한국재정정책학회 2014 財政政策論集 Vol.16 No.1

This paper focuses on the competitive relationship between transfer from central government and own sources of local government, which becomes a main issue as moral hazard problem of local government, in other words, it estimates on the possibility that transfer revenues becomes a incentive, which is able to interfere with an effort to collect tax from local government. The conclusion of this paper as follows; First, the decreasing tendency of own sources against increasing transfer revenues from central government is strong in counties, which have a relative weak fiscal capacity, and such the tendency is stronger in tax revenues than in nontax revenues. Secondly, the result from estimating on the relationship between transfer and own sources by dynamic model shows that although own sources specifically tax revenue increases in cities, specifically unconditional grant like local share tax dose not make increasing utility of investment by cities weak, while it make the utility weak from decreasing tax revenues in counties. Thirdly, under the structural changes such as increasing share tax rate, business recession, and economic crisis, transfer decreases own sources specifically in counties, especially it is founded even in cities from the cases of increasing share tax rate and economic crisis.

지구과학의 YX 그래프 해석을 위한 학습 모듈의 효과

김종희 ( Jong Hee Kim ),김주화 ( Ju Hwa Kim ) 경북대학교 중등교육연구소 2009 중등교육연구 Vol.57 No.1

본 연구의 목적은 지구과학의 YX 그래프 해석을 위한 학습 모듈을 개발하고 그 효과를 살펴보는 것이다. 이를 위해 지구과학의 YX 그래프 해석 능력 검사지를 제작하고, 43명의 고등학생을 대상으로 학생들이 YX 그래프 해석 과정에서 겪는 어려움의 원인을 분석하였다. 이를 바탕으로 지구과학의 YX 그래프 해석 능력을 향상시키기 위한 학습 모듈을 개발하였다. 개발한 모듈의 효과를 단일집단 사전사후검사를 통해 학습자의 YX 그래프 해석능력과 그래프 해석 관련 성취도가 향상되는지를 살펴보았다. 연구 결과 학생들은 그래프 해석 능력과 관련된 기본적인 개념(독립변인 종속변인 확인, 기울기 및 변화율의 분석 등)을 YX 그래프 해석에 적용하는데 어려움을 많이 겪고 있었다. 그리고 개발한 모듈은 학생들의 그래프 해석 능력과 그래프 관련 성취도를 향상시키는데 효과적이었다. 따라서 개발한 YX 그래프 해석을 위한 학습 모듈은 지구과학의 그래프 해석 능력이 부족한 학생들에게 매우 효과적인 보충학습자료로 활용할 수 있을 것이다. The purpose of this study is to develope the learning module for analyzing the YX graphs of Earth Science and observe the results of the learning module. For the purpose, worksheets to check the capabilities of analyzing the YX graphs of Earth Science were made and a study was conducted to 43 high school students and then in the process of the experiment the reasons why the students have difficulties in analyzing the graphs has been studied. On the basis of the results the learning module was developed to improve the capabilities of analyzing the YX graphs of earth science. The effects of the learning module have been examined through one-group pretest-posttest design. Two aspects of the results were observed: One is whether the capabilities of analyzing the YX graphs of earth science and achievement related to analyzing the YX graphs. According to the results of the study, students had lots of difficulties in applying the basic concepts related to analyzing the YX graphs(independent variables, dependent variables, analyzing of inclination, rate of change etc.) to analyzing the YX graphs. The learning module developed to solve this problem has been proved to be effective in improving the capabilities of analyzing the YX graphs of earth science and achievement related to analyzing the YX graphs. As a result, the learning module developed to improve the capabilities of analyzing the YX graphs will be used as supplementary materials for the students who are poor at analyzing the YX graphs in Earth Science.

아우구스티누스의 De Civitate Dei(『하나님의 도성』)에 나타난 보편사와 구속사

김종희 ( Jong-hee Kim ) 한국복음주의신학회 2015 성경과신학 Vol.76 No.-

본 고는 아우구스티누스의 De Civitate Dei (『하나님의 도성』)에서 보편사와 구속사를 분석했다. 천상의 도성과 지상의 도성이 공동체로서 살아가는 역사가 보편사라면, 하나님의 도성이 예정에 따라 구속되어가는 역사를 구속사라 할 수 있다. 구속사는 보편사를 통해 지속되는 하나의 선과 같은 역사로 보인다. 따라서 아우구스티누스의 보편사는 구속사의 자리를 허용하지 않는 판넨베르크의 보편사와 다르며, 그의 구속사 개념은 구속사 속으로 보편사를 흡수시키는 쿨만의 구속사와도 다르다. 아우구스티누스가 전개한 두유형의 역사는 구별은 되지만 분리되지는 않는 밀접한 관계에 있는 것이다. 이러한 연구는 기독교 역사교육의 내용을 제시하고, 보편사나 구속사에 편향된 연구자들에게 균형과 조화의 표준을 제공하며, 일반은총과 특별은총의 관계 연구를 증진하고 확장시키는 데에 기여할 수 있을 것으로 전망된다. This article explores universal and redemptive history by analyzing Augustine’s De Civitate Dei(the City of God). I argue that in the work of Augustine, universal history is the story of two cities, the heavenly city and earthly city, living together as one community, and redemptive history is the story of the heavenly city that is saved by election. Redemptive history does not take place alongside of universal history, but runs like a line through it. Therefore, Augustine’s universal history differs from that of Pannenberg, which does not allow a place for redemptive history. Moreover, his concept of redemptive history is not embraced by Cullman, who absorbs universal history into it. This paper provides scholars who treat this issue in biased ways, with the balanced content of Christian history. It also deepens the research of those who study the relationship between common and special grace, since the distinction between universal and redemptive history corresponds to the difference between the former two concepts.