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포오트폴리오의 成果分析에 관한 硏究 : 證券投資信託 分析을 中心으로
金建浩,金炯郁,金喆中 홍익대학교 경영연구소 1984 경영연구 Vol.8 No.-
Ⅰ. Introduction The performance evaluation of portfolio should try to access whether the right assets were chosen at the right time and how well these assets were diversified. The purpose of this paper is to explain the issues about the performance evaluation of portfolio, and to analyze the Security Investment Trust in Korea. For this purpose, first I studied the capital market theory and the theory of portfolio performance evaluation model derived from the CAPM. Second, I selected 16 stock-typed in vestment trust funds and used several models. (Fama, Sharpe, Treynor and jensen's). Ⅱ. Models and sampling. Model 1 : Fama's Excess Return=γ-_p-γ-_f. Model 2 : Sharpe's Index(RVAR)=γ-_p-γ-_f/σ_p Model 3 : Treynor's Index (RVOL)=γ-_p-γ-_f/b_p Model 4 : Jensen's Measure(α) γ-_p-γ-_f=α_i+β_p(γ-_m-γ-_f)+e_i For the empirical test, 16 stock-typed investment trust funds are selected. Time span of each date (γ-_p,γ-_m,γ-_f) is one week from Jan. 1981 to Jun. 1984. Ⅲ. Results From the regression output, Ⅰ found the following results. ①Unsystematic risk of trust funds is more than systematic risk. But fund managers have been diversified better than common investors. ② The abnormal performance results calculated for all funds during the research period indicate that the mutual funds had performance on a gross return basis. ③ Our funds have no significant relations between their performance and betas. But these results may be corrected when we take account of average dividend ratio of market and transaction costs.
고지방식이가 백서 골격근 및 지방조직의 지방분해에 미치는 영향
김철희,정윤이,이성진,박중열,홍성관,김홍규,서교일,이기업 대한당뇨병학회 2002 Diabetes and Metabolism Journal Vol.24 No.6
연구배경:지방산화의 증가가 골격근에서 인슐린 저항성을 유발한다는 주장이 꾸준히 제기되어 나왔으나, 최근 제2형 당뇨병 환자나 인슐린저항성 상태에서 골격근의 지방산화능이 저하되어 있다는 보고도 있어 논란이 있는 상태이다. 본 연구에서는 고지방식이를 투여하여 인슐린저항성을 유발한 백서에서 microdialysis 기법을 이용하여 조직내의 지방분해 결과로 간질액내로 방출되는 글리세롤 농도를 골격근 및 지방조직에서 직접 측정하여 지방분해의 변화를 알아보고자 하였다. 방법:정상 SpragueDawley 백서를 두 군으로 나누어 4주간 고지방식이 및 저지방식이를 투여하였다. 4주간 기저상태 및 고인슐린 정상혈당 클램프 중의 골격근 및 지방조직에 microdialysis probe를 삽입하고 일정한 농도의 글리세롤을 포함하는 dialysate를 통과시켜 주입액과 유출액의 글리세롤 농도 차이로부터 조직 간질의 글리세롤 농도를 산출하엿다. 결과:기저상태에서 골격근 및 지방조직 간질의 글리세롤 농도는 저지방식이군에 비하여 고지방식이군에서 유의하게 낮았다. 고인슐린 정상혈당 클램프 중에는 골격근 및 지방조직 간질의 글리세롤 농도가 양군에서 모두 억제되었는데, 기저 상태와 마찬가지로 골격근 및 지방조직 모두에서 저지방식이군보다 고지방식이 군에서 더 낮았다. 기저 상태에 대한 고인슐린 클램프중의 글리세롤 방출 억제 정도는 저지방식이군에 비하여 고지방식이군에서 덜 억제되는 경향을 보였는데, 골격근조직에서만 통계적으로 유의하였다. 결론:본 연구 결과는 고지방식이에 의한 인슐린저항성 모델에서 골격근 및 지방조직내 지방분해가 억제되어 있음을 보여주며, 기존의 포도당지방산 cycle 이론과는 달리 조직내 지방산화의 증가보다는 지방산화능의 감소에 따른 세포내 지방축척이 인슐린저항성과 관련될 가능성을 시사하였다. Background : It has been hypothesized that increased fat oxidation reduces glucose utilization in skeletal muscle, and is responsible for the insulin resistance associated with obesity or high-fat feeding. In contrast, there have been reports that fat oxidation capacity was decreased in skeletal muscles from insulin resistant subjects. This study was undertaken to examine whether insulin resistance in high-fat fed rats is associated with increased lipolysis in skeletal muscle and adipose tissue. Methods : Two groups of Sprague-Dawley rats were fed either high-fat or low-fat diets for 4 weeks. Lipolysis in skeletal muscle and adipose tissue was determined by measurement of interstitial 1 glycerol concentrations by a microdialysis method in basal and hyperinsuline mic-euglycemic clamp conditions. Results : In basal state, plasma glycerol levels and interstitial glycerol concentrations of skeletal muscle, and adipose tissue were lower in high-fat fed than in low-fat fed rats. The degree of suppression of glycerol release by the hyperinsuline mia was smaller in the high-fat diet than in the low-fat diet group. However, plasma and interstitial glycerol concentrations during the hyperinsuline mic euglycemic clamps were also lower in the high-fat diet group. Conclusion : Lipolysis was decreased in skeletal muscle and adipose tissue of insulin resistant, high-fat fed rats. These results support the idea that limited fat oxidation capacity resulting in lipid accumulation in tissues, rather than increased fat oxidation perse, is responsible for the insulin resistance associated with high-fat feeding (J Kor Diabetes Asso 24:641~651, 2000).
김재중,김철현,김영의 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
The concept of wave spectrum which represents the random characteristics of waves is introduced and analyzed in this study. Also time series analyses are done by using numerical model that computes the random wave transformation in the nearshore region. The characteristics of shoaling and refraction of random waves which is incident on the straight shorelines with parellel bottom contours are studied using the stecturm analysis. JONSWAP spectum in the deep water depth was converted into TMA specturn in the shallow water detph. TMA spectrum computes the spectrum of wind waves in finite water depth as a funtion of frectrum. This study way be helpful to determining the representative wave height and period for the random deseign waves of coastal structures in the shallow water.