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김지연,신용현 한국통계학회 2018 Journal of the Korean Statistical Society Vol.47 No.4
We consider the optimal consumption and portfolio selection problem with constant absolute risk aversion (CARA) utility. The economic agent in this model receives constant labor income, and her economic behavior is restricted on consumption and wealth, which are called the subsistence consumption constraint and the negative wealth constraint. We use the convex duality method to derive the value function and the optimal policies in closed-form solutions. Also we illustrate some numerical examples.
김지연,채재은 국제차세대융합기술학회 2024 차세대융합기술학회논문지 Vol.8 No.4
본 논문은 ‘글로벌박사양성사업(GPF사업)의 종료를 앞둔 시점에서 해당 사업이 대학원생의 연구 성과 산 출에 미친 영향을 실증적으로 분석하는 데 목적이 있다. 이를 위해 GPF사업 2단계 수혜자의 연구 성과 자료를 대상으로 ‘생존분석 기법’을 적용하여 사업 수혜자별 첫 연구성과(논문게재, 학술대회발표)의 산출 시점 및 영향 요인을 분석하였다. 분석 결과, ‘논문게재 성과’의 경우 수혜자의 75%가 사업 지원을 받은 후 9개월 내 첫 성과를 산출한 것으로 나타났으며, 논문게재 성과에 대해 유의미한 영향을 주는 변인은 없었다. 반면, ‘학술대회발표 성과’ 의 경우, 수혜자의 75%가 사업 지원을 받은 후 20개월 내로 첫 성과를 산출하였으며, ‘학위과정 유형 변수’가 학 술대회 발표 성과에 유의미한 영향을 미치는 것으로 나타났다. 이에 후속사업 설계시 수혜자별로 첫 연구성과 산 출 시점에 대한 모니터링을 강화하는 한편, 부진한 수혜자 대상의 멘토링 및 지속적인 연구 성과 산출을 위한 인 센티브를 제공할 필요가 있음을 논의하였다. This paper aims to analyze the timing and influencing factors of research outcomes (article publication, conference presentation) by beneficiaries of the 2nd phase of the GPF, a program that supports graduate student-led research, through the survival analysis method. The results of the analysis showed that in the case of 'article publication outcomes', 75% of project beneficiaries achieved their first results within ninth month after the GPF started, and there were no significant variables that affected the outcomes. In the case of 'conference presentation performance', 75% of project beneficiaries achieved their first results within 20 months after the start of the GPF. Only the 'type of degree program' had a significant effect on the performance. These results suggest that when designing a follow-up project, it is necessary to monitor the timing of the first research output by beneficiaries and offer incentives to continue to produce research outputs.
Effects of Gamisoyosan on In Vitro Fertilization and Ovulation of Stressed Mice by Electric Shock
김지연,Dong Hoon Kwak,Eun Jin Ju,Sung Min Kim,Dae Hoon Lee,Kyung Su Keum,Seo Ul Lee,Kyu Yong Jung,Byoung Bu Seo,Young Kug Choo 대한약학회 2004 Archives of Pharmacal Research Vol.27 No.11
Exposure to stress is known to precipitate or exacerbate many reproductive dysfunctions such as dysmenorrhea and infertility. Abnormalities of the reproductive system, as shown by reduced ovulation, fertilization and early embryonic development, are frequently seen in dysmenorrhea and infertility. It has been generally accepted that Gamisoyosan (GSS) is a useful prescription for treating insomnia, dysmenorrhea and infertility induced by a stress. Also GSS has been used traditionally to improve systemic circulation and biological energy production. Based on these, this study investigates whether GSS improved ovarian dysfunction caused by stress in mice. Mice were subjected to stress by electric shock on the foot for 30 min daily for a week and treated with GSS at 500 / body weight per day for one week. Thereafter, changes body weight, adrenal weight, ovulation rate, in vitro and in vivo fertilization, embryonic development and estradiol concentrations were measured. GSS markedly increased the body weight of mice with stress, but not normal mice. The administration of GSS caused a reduction in adrenal weight in stressed mice. GSS also had significant positive effects on ovulation rate, estradiol production, in vivo and in vitro fertilization rates and embryonic development. These results indicate that GSS can improve the reproductive dysfunctions caused by stress, and these may production biological energy.
복직근 유리 피판을 이용한 유방 재건에서 혈관성 이상 소견에 의한 재수술의 시점 및 원인
김지연,장학,민경원 대한성형외과학회 2009 Archives of Plastic Surgery Vol.36 No.5
Purpose: The high success rate of free flap transfers is well documented in previous literature, and is possible due to the early detection of vascular compromise and timely reoperation. We specifically analyzed the operative results of immediate and delayed reconstruction with free transverse rectus abdominis musculocutaneous(TRAM) flap respectively in order to reveal its distinctive features on timing and causes of vascular compromise. Methods: The senior author operated on 158 patients, 161 cases of free TRAM flap for breast reconstruction. 51 patients underwent delayed reconstruction, whilst immediate reconstruction was performed in the other 107 patients. All patients were monitored every 3 hours for the first 3 days. We reviewed medical records of all patients, and tested statistical significance with the Fisher’s test. Results: Reoperation was performed in 20 cases, but the cases include hematoma with bleeding focus and arterial anastomosis site rupture due to abrupt arm abduction. We performed reoperation in 15 cases of suspicious vascular compromise. Flap compromise was noticed mostly within 24 hours, but not longer than 72 hours. Venous compromise was dominant by 11 cases(73.3%). There was difference in the timing of flap compromise between immediate and delayed reconstruction. All the cases of delayed reconstruction did not show signs of vascular compromise after 12 hours postoperatively. On the other hand, cases of vascular compromise were observed until 72 hours postoperatively in cases of immediate reconstruction. Conclusion: Delayed reconstruction showed vascular compromise within 12 hours postoperatively, while immediate reconstruction showed compromised until the 3rd postoperative day. If more aggressive monitoring is maintained during this period, we believe salvage of flaps may be increased with more efficiency.