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.

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.

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.

정신분열병 환자의 정서 및 사회성 회복에 미치는 동서양 꽃꽂이의 비교

김종희(Jong-Hee Kim),김홍열(Hong-Yul Kim),한인자(In-Ja Han),김정희(Jeong-Hee Kim),전연주(Youn-Ju Jeon),김이영(Yi-Young Kim) 한국원예학회 2002 한국원예학회 학술발표요지 Vol.2002 No.6

경상수지의 지속 가능성과 대외부채의 영향에 대한 연구

김종희 ( Jong Hee Kim ) 한국국제경제학회 2013 국제경제연구 Vol.19 No.1

이 논문은 최근 여러 국가들에게서 발견될 수 있는 지속적인 경상수지 적자와 그로인해 발생하는 대외부채의 누적에 초점을 맞추고 있다. 즉 OECD 34개 국가들의 2000년 1분기부터 2011년 4분기까지, 44개 분기의 자료를 바탕으로 무역적자, 경상수지 적자 등을 통해 대외부채가 유발될 수 있는지를 추정하고, 만약 지속적인 경상수지의 적자로 인하여 대외부채의 누적이 불가피한 것이라면, 이러한 대외부채의 증가가 총투자, 민간소비, 정부지출 등 총수요 측면에 어떠한 영향을 미쳐 경상수지를 개선시키는 효과가 있는지를 추정한다. 또한 각 국가는 이러한 대외부채를 상환할 능력이 있는지, 즉 경상수지의 적자규모는 지속가능한 것인지를 확인함 으로써 경상수지 적자의 건전성과 대외부채의 적절성을 실증분석해 보고자 하는 것이다. 본 논문의 추정결과에 의하면, 만성적인 경상수지 적자로 인하여 각 국가는 대외부채를 증가시키지만, 이러한 대외부채의 누적은 경상수지를 개선시키지 못한다. 또한 대외부채의 증가는 각 국가의 지속가능한 경상수지의 규모를 더 악화시켜 대외부채의 상환에 대한 부담을 가중시킨다. 그리고 경상수지 적자의 증가는 대외부채의 증가를 가져오며, 대외부채의 증가는 다시 경상수지를 악화시키는 악순환을 만들 가능성이 높다. 이러한 경향은 이미 경상수지 적자를 겪고 있는 국가들에게서 더 크게 나타나고 있다. This article focuses on a chronic deficit of current account, and an accumulation of external debt, which comes from that deficit. That is, using 44 quarterly data set of OECD 34 countries from 2000 to 2011, this article verifies as follows; first, is external debt caused by trade deficit and current account deficit?, second, if an accumulation of external debt from the chronic deficit of current account is unavoidable, then is such the debt effective on improving the current account deficit?, and finally, has each country the ability to repay the debt?, that is, empirically verifying the consolidation of current account deficit and appropriation of external debt by testing the sustainability of current account. According to my results, although each country increases external debt under the situation of a chronic deficit of current account, such the debt can not improve the current account deficit. And the accumulation of external debt increases its repayment burden by aggravating the sustainability of current account. Finally, current account deficit causes the accumulation of external debt, and such the accumulation aggravates current account deficit again, and such the vicious circle is bound to happen in the countries, which are already suffering current account deficit.

석탄화력발전설비 리턴휠(SCM440-SS400)의 레이저-아크 하이브리드 용접시 맞대기 용접성 평가

김종희(Jong-hee Kim),방한서(Han-sur Bang),배재용(Jae-yong Bae),방희선(Hee-seon Bang) 대한용접·접합학회 2018 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2018 No.4

주택시장에서 금융제약 계층의 미래 주택수요 변화요인에 대한 연구

김종희(Kim, Jong-Hee) 계명대학교 사회과학연구소 2023 한국사회과학연구 Vol.42 No.3

본 연구는 주택담보대출 수요실태조사의 2011년부터 2022년까지의 총 60,043가구의 마이크로 자료를 이용, 가구가 향후 구매(또는 임대)하고자 하는 주택의 가격, 유형 등을 분석하여 미래 주택수요의 결정요인을 분석하고 있다. 본 연구의 실증분석 결과는 다음과 같다. 첫째, 자가 가구는 최근까지 계속 증가하고 있는 반면, 차가 가구는 감소추세이다. 그리고 미래의 주택구매나 임대의향 가구 모두 2017년을 기점으로 크게 감소하고 있었다. 둘째, 미래의 주택 구매의향 가구들은 임대 의향 가격 대비 구매의향 가격이 상승하면 주택 구매수요가 증가하지만, 임대의향 가구들은 임대수요를 감소시켰다. 셋째, 청년층, 저소득층, 그리고 신용제약층 모두 향후 상대적으로 낮은 구매가격을 예상하고 있는 것으로 나타났다. 넷째, 2017년 이후 최근까지 청년층의 주택 구매수요는 감소하고 있었으며, 저소득층의 경우 임대수요가 감소하고 있었다. 따라서 2017년 이후 주택시장에서 강화된 금융규제는 상대적인 금융제약층에 더 유의미한 영향을 미친 것으로 판단된다. This paper analyzes the changes of housing demand in future of 60,043 households from micro-level data of Korea Housing-Finance Corporation, 2011-2022, by focusing on the classification of the class of financial constraint class such as youth, low income, and credit constraint. The following three conclusions are able to be used the results of its empirical analysis to draw. First, Home-owning households has increased up to recently, while renting households has decreased. Second, the future purchasing demand on the households which have a plan to purchase house increases while the rental demand of household which have plan to rent house decrease, as the price of purchase intention relative to rental intention. Third, The youth, low income, and credit constraint households are all expecting the relative low purchasing price for the future housing demands. Finally, the purchasing demand of youth class decreases while the demand of middle aged increases since 2017. And both demands of credit constraint class decreases since 2017.