지역농협의 자산건정성 제고를 위한 요인분석

정대희,한두봉 한국농식품정책학회 2008 한국농식품정책학회 학술대회 논문집 Vol.2008 No.2

세계 카사바산업 동향

정대희 한국농촌경제연구원 2012 세계농업 Vol.145 No.-

세계 팜유산업 동향

정대희 한국농촌경제연구원 2012 한국농촌경제연구원 기타연구보고서 Vol.- No.146

석탄, 폐타이어, 폴리프로필렌 공동액화 특성 및 상승효과(II)

정대희,정태진,김상준,나병기,송형근,윤도영,김대흠,한춘,Jeong, Dae-Heui,Jeong, Tae-Jin,Kim, Sang-Jun,Na, Byung-Ki,Song, Hyung-Keun,Yoon, Do-Young,Kim, Dae-Heum,Han, Choon 한국에너지학회 2001 에너지공학 Vol.10 No.4

본 연구에서는 순간 고온식 tubing-bomb reactor를 사용하여 41$0^{\circ}C$에서 Aaska산 아역청탄, 페타이어, 폴리프로필렌 혼합물의 공동액화 시 반응기구 및 상승효과를 규명하고, 37$0^{\circ}C$~45$0^{\circ}C$의 온도범위에서 실험을 통하여 공동액화모델의 유효성을 실증하였다. 이 때 공동액화반응은 non-linear parameter estimation method에 의해 모사되었으며 실험값과 계산값의 상관계수는 0.99로서 부합도가 높았다. 또한 무촉매 반응에서는 tetralin의 첨가량을 증가시키면 폴리프로필렌의 액화가 저하되어 액화율이 감소되는 경향을 보였으나, Mo, Co와 Fe의 naphthenate계 촉매가 첨가된 반응에서는 3가지 촉매의 경우 모두 tetralin의 첨가량이 증가함에도 폴리프로필렌의 액화가 증진되면서 공동액화율이 상승하는 경향을 나타내었으며, 특히 Co-naphthenate의 경우 21~23%의 높은 상승효과를 보였다. Characteristics and synergistic effects of the coliquefaction of Alaskan subbituminous coal, wasted tire, and polypropylene were investigated in a tubing-bomb reactor at 41$0^{\circ}C$, and the coliquefaction reactions were performed at 37$0^{\circ}C$~45$0^{\circ}C$ to evaluate the coliquefaction mechanism. The coliquefaction kinetic model based on the free-radical theory was proposed and simulated by the non-linear parameter estimation method. Simulated results represented experimental ones successfully with the correlation coefficient of 0.99. When a catalyst was not used, the conversions were decreased as tetralin increase due to the decrease of liquefaction of polypropylene. When naphthenate catalysts of Mo, Co, and Fe were used, the coliquefaction conversions were increased with the increase of the liquefaction of polypropylene. When Co-naphthenate catalyst was used, the increase of the coliquefaction conversion were as high as 21~23%.

소아암으로 자녀를 잃은 부모의 사별과 애도 경험에 대한 연구

정대희,김민아,남석인 한국사회복지질적연구학회 2021 한국사회복지질적연구 Vol.15 No.2

This study aimed to understand the bereavement and grief process experienced by parents who lost children to childhood cancer. In-depth interviews were conducted with seven bereaved parents (five mothers and two fathers) who lost their children to cancer. The participants’ ages ranged from 38 to 55 years old, and their children's diagnosis included leukemia and brain tumors. Time since the child’s death ranged from 1 year and 4 months to 5 years and 3 months. Using the multiple case study method, between-case analysis and cross-case analysis based on within-case analysis were conducted and yielded 36 subthemes in five overarching themes. The themes included parents' experiences during diagnosis and treatment for their children until their death, complex grief responses after their bereavement, social stigma toward parents who lost their children, difficulties in relationship with remaining families, and coping with loss. The results showed parents experienced various difficulties in the bereavement and grief process and revealed their efforts to cope with the pain of loss throughout the grief process. This study implies that an integrated bereavement support system should be established for pediatric cancer patients and their families to receive various support services before the death and during bereavement. 본 연구는 소아암 자녀를 잃은 부모가 경험한 사별 및 애도 과정을 이해하기 위한 것으로 소아암으로 자녀를 잃은 지 최소 1년이 경과한 사별 부모 7명(어머니 5명, 아버지 2명)을 대상으로 심층면담을 실시하였다. 연구 참여자들의 연령은 38세에서 55세였고, 자녀의 진단명은 백혈병과 뇌종양을 포함하였으며, 사별 후 경과기간은 최소 1년 4개월에서 최대 5년 3개월이었다. 다중 사례연구 방법을 이용하여 사례 내 분석을 토대로 한 사례 간 분석 및 교차사례 분석을 실시한 결과 36개의 하위 주제가 5개의 대주제로 제시되었다. 본 연구 결과에서는 자녀 임종까지의 돌봄 과정, 사별 이후 복합적인 애도 반응, 자녀를 잃은 부모에 대한 사회의 부정적 시선, 애도 과정에서 남은 가족과의 관계 어려움, 슬픔과 상실에 대한 대처와 관련하여 사별 부모들의 경험이 보고되었다. 이들은 사별과 애도과정에서 다양한 어려움을 나타냈지만, 상실의 고통에 대처하는 노력도 함께 보고하면서 사별 과정 전반에서의 경험을 생생하게 보여주었다. 본 연구를 통해 소아암 환자와 가족을 대상으로 한 환아의 임종 이전부터 사별을 준비하고 사별 이후 다양한 돌봄을 지원받을 수 있는 통합적인 사별지원 체계가 구축되어야 함을 제언하였다.

Mutational analysis of the RNA helicase Dhh1 in Ste12 expression and yeast mating

정대희,안지혜,이보람,김진미 한국미생물학회 2017 The journal of microbiology Vol.55 No.5

Dhh1 and Dhh1 homologues (RCK/p54/DDX6) are membersof the DEAD-box protein family of RNA helicases. Theseproteins display conserved sequence motifs for ATPase andRNA binding activities. Dhh1 is a component of the P-bodies(processing bodies) of mRNA granules and functions as anmRNA decapping activator in Saccharomyces cerevisiae. Dhh1 also contributes to gene-specific regulation during yeastmating. The dhh1 deletion mutation results in a significantdecrease in the expression of Ste12, a mating-specific transcriptionfactor, showing severe mating defects. Here, we introducedamino-acid substitution mutations in the ATPaseand RNA binding domains of Dhh1 and also constructed adeletion of 79 amino acids at the Q/P-rich C-terminal region. The mutations in ATPase A and B motif (K96R, D195A) andC-terminus deletion showed reduced levels of mating efficiencyas well as Ste12 protein expression. The Q/P-rich Cterminalregion of Dhh1 was dispensable for growth at nonpermissivetemperature 37°C but appeared to play an importantrole in regulating the Ste12 protein expression andmating processes. The P-body accumulation induced bytreatment with α-mating factor required ATPase, RNA-bindingand the Q/P-rich C-terminal domains of Dhh1.

항공기 SUB-SYSTEM설계

정대희,나승혁 한국항공우주학회 1992 한국항공우주학회 학술발표회 논문집 Vol.- No.-

Estimating China’s Capital Flows-at-risk: The Case of Potential US Financial Sanctions

정대희 한국개발연구원 2022 KDI Journal of Economic Policy (KDI JEP) Vol.44 No.4

The arena of strategic competition between the US and China is expandable from international politics, trade and commerce to finance. What would happen if financial sanctions against China are imposed by the US? Would US financial sanctions lead to a sudden outflow of foreign capital and a liquidity crisis in China? We try to address these questions by estimating China’s capital flows-at-risk with the CDS premium on Chinese sovereign funds. We follow Gelos et al. (2019) in setting up a quantile regression model from which China’s foreign capital flow-at-risks are estimated. Based on our analysis of China’s monthly capital flow data, we find that a rise in the CDS premium has statistically significant negative impacts on China’s foreign capital flows-at-risk, mainly in banking flows. However, the analysis also found that due to favorable global conditions, an increase in the CDS premium is unlikely to trigger a shift to a sudden outflow of foreign capital at the moment. Meanwhile, this study found no statistically significant correlation between Korea’s capital flows-at-risk and the CDS premium, suggesting that the negative impact of US financial sanctions on China would not increase the probability of capital flight from Korea in a significant manner.

북·남미 와인산업 동향

정대희,정구현 한국농촌경제연구원 2013 세계농업 Vol.149 No.-

The Effect of the Global Financial Crisis on Corporate Investment in Korea: From the Perspective of Costly External Finance

정대희 한국개발연구원 2015 KDI Journal of Economic Policy (KDI JEP) Vol.37 No.1

This paper examines the effect of the global financial crisis on corporate investment in Korea. Specifically, the crisis was considered to have possibly constrained firm-level investment as the negative shock to the credit supply dramatically unfolded. As Duchin et al. (2010) demonstrated, if a negative supply-side shock is evident during a crisis period, larger cash holdings before the crisis will lead to fewer constraints to corporate investment, or vice versa. In order to investigate the supply-side effect of the crisis, we use firm-level financial data, including firms listed on the Korean stock market as well as small and medium-sized enterprises. We find that corporate investment declined significantly after the crisis, even if we control for factors associated with the demand side, such as contemporaneous capital productivity and cash flow. More importantly, the decline is positively and significantly related to cash holdings before the crisis, implying the negative effect of a credit supply shock. Small and medium enterprises experienced relatively sharp investment declines compared to those of larger firms, and the relationship between pre-crisis cash amounts and the degree of investment decline is greater than that in large firms. Additionally, we examine whether the negative effect persists up to the present, finding evidence that the cash-investment relationship continues in small and medium-sized enterprises.