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환경친화적 단백질 HrpNEp 처리에 의한 백합의 생육 및 절화 특성 검정
김학기(Hak Ki Kim),박덕환(Duck Hwan Park),임춘근(Chun Keun Lim),이미림(Mi Rim Lee),홍세진(Sae Jin Hong),엄병헌(Byung-Hun Um) 한국원예학회 2006 원예과학기술지 Vol.24 No.2
본 연구는 환경친화적 단백질 HrpNEp를 처리하여 백합의 생육특성을 알아보기 위해 수행하였다. 환경친화적 단백질 HrpNEp 백합의 줄기 길이 신장을 촉진하고 두께를 굵게 하며, 줄기의 경도를 높여주고 절화의 휘는 정도를 감소시켰다. 또한 줄기내 무기질 함량 중 줄기 경도 향상에 유리한 칼슘과 마그네슘의 흡수를 촉진하였다. 환경친화적 단백질 HrpNEp 처리는 10mg L⁻¹의 농도에서는 4회 이상 그리고 40mg L⁻¹에서는 2회의 처리만으로도 각각의 품질 요인면에서 효과가 상승하는 것으로 조사되었으며, 처리 횟수를 많이 할수록 효과는 우수하였다. HrpNEp와 칼슘 또는 마그네슘과의 교호처리는 백합줄기 내 흡수에 상호 길항작용이 관찰되었으며, 환경친화적 단백질 HrpNEp는 길항작용을 일으키지 않는 한도 내에서 마그네슘과 특히 환경친화적 단백질 HrpNEp 10mgㆍL⁻¹과 칼슘의 교호처리와 HrpNEp 40mg L⁻¹ 단독처리가 백합 절화의 품질에 유리하였다. This study was conducted to investigate the effect of HrpNEp protein extracted and purified from Erwinia pyrifoliae WT3 on the growth and cut flower quality of oriental hybrid lily. HrpNEp, a kind of environment-friendly protein, stimulated growth of the shoot length and stem diameter, and increased the stem strength, but decreased the curvature of the shoots with flower buds. Calcium and magnesium which are supposed to have some positive effects on the hardness of tissues were absorbed more in HrpNEp-treated shoots than the control. To improve the quality of cut flowers, the lily needed 4 or 2 times treatments with 10 or 40 mg L⁻¹ HrpNEp, respectively, and additional treatment with HrpNEp gave even better quality. There was some antagonism between magnesium and calcium when they were used alternatively with HrpNEp. High quality cut flowers were produced by treatment with 10 mg L⁻¹1 HrpNEp and calcium, with a synergistic effect within the limits of antagonism, and also with 40 mg L⁻¹ HrpNEp treatment alone.
김세권(Sae Kwon Kim),박기환(Kee Hwan Park) 한국증권학회 2011 한국증권학회지 Vol.40 No.2
우리 논문은 한국시장에서 기업의 부도위험과 주식수익률간의 관계를 연구한다. 우리는 옵션모형에 기초하여 기업의 부도위험을 측정하였다. 우리는 부도위험이 높은 기업이 낮은 기업보다 그 주식 수익률이 높다는 사실을 발견하였다. 그리고 Fama-MacBeth 횡단면 회귀분석을 적용한 결과 부도위험효과는 유의하지만 규모효과와 BM 효과는 유의하지 않음을 발견하였다. 다만 규모효과는 개별적으로는 유의하지 않지만 부도위험효과와의 相乘효과는 유의한 것으로 나타났다. 더 나아가 우리는 시계열 수익률이 위험프레미엄의 시간변화(time variation)로 설명될 수 있는가를 조사하였다. 우리는 주식(포트폴리오) 시계열 수익률의 상관계수행렬을 사용한 주성분분석을 하였다. 우리가 발견한 주요인을 규모, BM, 그리고 부도위험 프레미엄으로 시계열 회귀분석을 한 결과 부도위험 변수는 BM 변수를 대리하는 한편 규모변수와 부도위험 변수는 각각 독립적인 유용한 정보를 갖고 있음이 밝혀졌다. In this paper, we study the relation between the default risk of a firm and its equity return in the Korean stock market and relate the default effect to the Fama-French size and book-to-market effects. We measure the default probability of a firm based on the Merton`s (1974) option model for the contingent claims. We find that the return for a high-default risk firm is economically and statistically higher than that for a low-default risk firm and the default effect is intimately connected with the Fama-French factors. In order to carefully examine the relationships, we conduct both the cross-sectional and time-series analyses. The cross-sectional analysis relys on the Fama-MacBeth cross-sectional analysis (1973), and the time-series analysis on the Ludvigson and Ng (2007) principal component analysis for the stock returns. The results indicate that the default risk strongly proxies the book-to-market effect, while the size effect carries an important information independent of the default risk factor. We compare our results vis-a-vis the result obtained by Vassalou and Xing (2004) which studied the default risk effect on the equity return in the U.S. market. Finally, we discuss its implications for the equilibrium models such as Merton`s (1973) intertemporal CAPM.
Elliptical Centric과 TRICKS 기법의 임상 적용에 관한 유용성 연구
김새싹,구은회,동경래,권대철,이재승,조재환,박창희,Kim, Sae-Ssak,Goo, Eun-Hoe,Dong, Kyung-Rae,Kweon, Dae-Chel,Lee, Jae-Seung,Cho, Jae-Hwan,Park, Chang-Hee 대한디지털의료영상학회 2011 대한디지털의료영상학회논문지 Vol.13 No.2
To prospectively determine the diagnostic performance a combination of standard bolus-chase magnetic resonance (MR) angiography and MR angiography with time-resolved imaging of contrast kinetics (TRICKS) for depicting severity of the head and neck vascular diseases. Over a period of two months, A total of 100 patients(average ages : $50{\pm}8$, male : 60, female : 40) with head and neck vascular diseases were performed on the GE excite 3.0 T units with 8-channel head coil and 4-channel NV coil. Imaging parameters for a typical study were as follow: SBC(TR/ TE/ FA/ SliceThicken./ Slab/ Freq./ FOV/ BW/Scan Time) = 5.4/ min/ 30/ 2/ zip2/ 70/ $224{\times}448$/ 30/ 62.50/ 28, TRICKS(TR/ TE/ FA/ Slice Thicken/Slab/ Freq./ FOV/ BW/ Temp Res./ Scan Time = 3.6/ min/ 25/ 4/ 30/ $160{\pm}384$, zip512/ 30/ 100/ 1 to 1.5/ 23). The analysis of all MR images, which have respect-ively classified two techniques into some diseases. The results of the former were divided into two groups(SBC, TRICKS)with 4 grading of two reader, respectively. Wilcoxon signed rank test was used to determine if a significant difference between imaging techniques existed(p < 0.05). In 33 of 100 patients, arterio-venous malformation was 11% at TRICKS, subclavian vein stenosis : 8%, fistular sinus : 4%, jugular vein stenosis:6%, Middle Cerebral Artery bypass surgery : 4%, p < 0.05). The rest of 67 patients were considered as the results of SBC(14% in the basilar artery stenosis, carotid stenosis : 16%, vertebral stenosis : 17%, central neuro-cytoma : 5%, meningioma : 5%, Not appliable : 10%, p < 0.05). Sensitivity and specificity of TRICKS MR angiography in SVS, FS, JVS, MCABS were improved compared with those at standard MR angiography. In SBS MR angiography which were improved in BAS, CS, VS, CN, Meningioma. In conclusion, TRICKS MR angiography of the SVS, FS, JVS, MCABS is superior to standard MR angiography regarding the number of diagnostic grading. The SBS MR angiography were improved in BAS, CS, VS, CN, Meningioma. and assessment of the degree of luminal narrowing on both TRICKS and SBS.
미성견에서의 편측성 하악과두돌기 탈구성골절의 외과적 처치 및 보존적 처치에 대한 비교실험적 연구
김영균(Kim Young Kyun),여환호(Yeo Hwan Ho),김수관(Kim Su Kwan),이효빈(Lee Hyo Bin),변웅래(Byeon Woong Rae),조세인(Cho Sae In),조재오(Cho Jae O) 대한구강악안면외과학회 1994 대한구강악안면외과학회지 Vol.20 No.1
This study evaluated the results of surgical and conservative treatment of managing simulated unilateral dislocated fractured mandibular condyles. Group A left the fractured condyle in its dislocated position outside the glenoid fossa. Group B consisted of surgical treatment by completely detaching the condyle, then replacing it as free graft and its subsequent fixation with interosseous wiring. Immediate postoperative mandibular function was performed in both groups. In both groups, we performed simulated retrodiscal injury and discal displacement by incision. Clinical, morphologic, functional, radiologic, and histologic examinations were conducted on all animals. We got the following results. 1. There were no functional and morphological deformities in both groups. 2. The radiographic examination showed the good union of fractured line and condylar remodeling at 3 months in both groups. 3. In all experimental period, no inflammatory reaction was observed. In both groups, good condylar remodeling change was observed. The chondroid tissues apperared between the hypertrophic zone and subchondral bone area. None of the condyles were lost as result of necrosis in group B.