분과 2 : 고등학교 학생의 대수 (代數) 문제 해결 : 전략과 오류 분석

이상원,전평국 ( Sang Won Lee,Pyung Kook Jeon ) 한국수학교육학회 1994 수학교육 프로시딩 Vol.2 No.-

가격괴리율과 추적오차에 의한 ESG ETF의 성과분석

이상원(Lee, Sang-Won) 한국경영교육학회 2020 경영교육연구 Vol.35 No.6

[연구목적] 본 연구에서는 사회적책임투자와 관련하여 ESG 투자의 성과를 알아보기 위해 국내 상장된 ESG ETF를 대상으로 성과를 실증분석하였으며 이를 통해 국내 ESG ETF의 성과와 특성을 알아보고 이와 관련된 시사점을 제공하였다. [연구방법] 본 연구는 국내 상장된 ESG ETF의 가격괴리율과 추적오차 분석을 통해 ESG ETF의 성과를 분석한다. 또한, 코로나 19 발생 이전과 발생 이후의 기간에서의 ESG ETF의 성과에 대하여 비교 분석한다. [연구결과] ESG ETF가 기초지수보다 평균수익률은 높았고, 표준편차는 낮은 것으로 나타났다. 가격괴리율 평균은 유의한 음(-)의 값을 보였고 할인 현상이 할증 현상보다 더 많이 발생하였으며, 코로나 19 발생 이후 기간에서 가격괴리율의 절대치가 더 크게 나타났다. 추적오차 분석에서 평균 추적오차의 절대치는 상당히 작았고 통계적으로 유의한 것으로 나타났다. 또한, 회귀분석에 의한 추적오차 분석에서 ESG ETF의 수익률이 기초지수의 수익률을 잘 추적하지 못하는 것으로 나타났으나, 그 차이는 매우 작았으며 이러한 차이는 코로나 19 발생 이후 기간에서 더 크게 나타났다. [연구의 시사점] 국내 ESG ETF는 할인현상이 더 많이 발생하였고 가격괴리율은 0과 동일하지 않아 효율적이지 못한 것으로 판단된다. 추적오차는 작았지만, ESG ETF의 수익률과 기초지수의 수익률간에는 유의적인 차이가 존재하여 ESG ETF가 기초지수를 효율적으로 추적하지 못한다고 평가할 수 있다. 이를 통해 국내 ESG ETF 투자에 의해 초과성과를 얻기에는 다소 한계가 있음을 유추할 수 있었고, 이러한 결과는 ESG ETF 투자와 관련 규제 입안 등의 자료로 활용될 수 있을 것으로 기대된다. [Purpose] This study empirically analyzes the performance of ESG ETFs in Korea to find out the performance of ESG investment in relation to social responsible investment. Through this, the performance and characteristics of ESG ETFs were investigated and implications were provided. [Methodology] This study reviews the performance of ESG ETFs through price disparate ratio and tracking error of ESG ETFs in Korea. In addition, the performance of ESG ETFs in the period before and after the outbreak of Corona 19 is compared and analyzed. [Findings] ESG ETF showed higher average rate of return and lower standard deviation than the underlying index. The average price disparate ratio was a significant negative value, and the discount occurred more than the premium. And the absolute value was larger in the period after Corona 19. In the tracking error analysis, the absolute value of the average tracking error was significantly small and statistically significant. The analysis of the tracking error by regression analysis showed that the return of ESG ETF did not track the return of the underlying index well, but the difference was very small and this difference was larger in the period after Corona 19. [Implications] This study can be inferred that there is a limit to the excess performance by ESG ETF investment These results are expected to be used as data such as ESG ETF investment and regulation drafting.

다발성 요추간반 탈출증에서 추간반조영술의 진단적 의의

이상원,김긍년,진동규,김영수,조용은,진병호,Lee, Sang-Won,Kim, Keung-Nyun,Chin, Dong-Kyu,Kim, Young-Soo,Cho, Yong-Eun,Jin, Byung Ho 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.5

Objective : The introduction of MRI makes it easy to detect multiple lumbar disc herniation. However, MRI is not a physiologic test for detecting the symptomatic level. For the surgical plan, it is very important to determine the symtomatic level among the multiple lumbar disc herniation. In this regard, we studied diagnostic significance of discography on multiple lumbar disc herniation in determining the symptomatic level. Method and Material : We retrospectvely analyzed the discographic and clinical findings of 121 patients with multiple lumbar disc herniation for investigating the diagnostic availability of discography. All were surgically treated from January 1995 through May 1998. Result : Discography provocated the same pain as usual symptom in 99 out of 121 patients(81.8%). Compared with surgical findings, the diagnostic accuracy of the discography in multiple lumbar disc herniation was 75.6%, sensitivity was 64.6%, and specificity 87.2%. There was no correlation between the pain provocation of discography and the extent of annular degeneration on CT/discogram. The pain provocation showed good correlation with the extent of annular disruption on CT/discogram. The rate of same result(correlation rate) between the discography and D.I.T.I was 81.4% in multiple lumbar disc herniation patients with unilateral leg pain. Conclusion : These results indicate that in multiple lumbar disc herniation, the discography is considered useful diagnostic tool to determine the symptomatic level and to decide the surgical plan.

"동의보감"과 "제중신편"에 기재된 처방중 수치대황의 종류와 효능에 대한 고찰

이상원,김현정,김진숙,Lee, Sang-Won,Kim, Hyeun-Jeong,Kim, Jin-Sook 한국한의학연구원 2003 한국한의학연구원논문집 Vol.9 No.1

The Effects and processing methods of Rhei Rhizoma from Donguibogam and Chejungsinpyeon were studied, Through the study, we found 21 kinds of processing method of Rhei Rhizoma in Donguibogam and Chejungsinpyeon, Processing methods used in Donguibogam and Chejungsinpyeon were effective from reducing side effects of Rhei Rhizoma, and were safe in clinical application, the aims of processing methods of Rhie Rhizoma were safer application by reducing poisonous character, and increase the range of clinical application by useing 21 kinds of processing methods.

$H_{2}O_2$와 A$\beta$로 유도된 pc12 cell에서 생산조인(生酸棗仁) 수추출물의 항산화 및 항치매 효과

이상원,김대현,윤종현,김진우,정은영,이성근,이기상,김태헌,류영수,강형원,Lee, Sang-Won,Kim, Dae-Hyun,Yun, Jong-Hyun,Kim, Jin-Woo,Jung, Ejun-Young,Lee, Seoung-Geun,Lee, Key-Sang,Kim, Tae-Heon,Lyu, Yeoung-Su,Kang, Hyung-Won 대한한방신경정신과학회 2008 동의신경정신과학회지 Vol.19 No.3

Objective: The antioxidant and anti-Alzheimer effects of Semen Ziziphi Spinosae (SZS) water extract against the amyloid beta peptide (1-42) or H202-induced oxidative damage and cell death were investigated in rat pheochromocytoma line PC 12. Methods: The cells were incubated with SZS water extract and oxidative damage-inducing materials, amyloid beta peptide (1-42) or H2O2 for 24 h. The cellular viability was assessed by WST-1 assay, cytotoxic damage by LDH activity assay, oxidative damages of cells by fluorescence spectrophotometric method, and apoptosis by TUNEL staining assay. Results and Conclusions: 1. Preincubation of the cells with SZS water extract prior to amyloid beta peptide (1-42) (2 uM) or H2O2 (30 uM) exposure elevated the cell survival close to the control and decreased the level of LDH activity and the fluorescence from the cell homogenates and TUNEL staining of the cells, compared to only amyloid beta peptide (1-42) (2 uM) or H2O2 (30 uM) treated conditions. 2. Our study suggests that Semen Ziziphi Spinosae (SZS) water extract has protective effects against amyloid beta peptide (1-42) or H2O2-induced cell toxicity through the antioxidation mechanism, which might be beneficial for the treatment of Alzheimer's disease.

Aspergillus awamori와 Zymomonas mobilis로 구성된 혼합고정화 배양계의 에탄올 생산에 미치는 Neupectin-L의 영향

이상원,조용운,김홍출,박석규,성낙계 ( Sang Won Lee,Yong Un Cho,Hong Chul Kim,Seok Kyu Park,Nack Kie Sung ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.2

In order to reduce energy input in direct ethanol production from raw starch by co-immobilized Aspergillus awamori(A) and Zymomonas mobilis(Z), A-Z 36 culture system which was changed to anaerobic after 36 h of aerobic fermentation without sterilization was investigated. This immobilized cell system can not be carried out under unsterile conditions because of growth of microbial contaminants from original medium. Among some food additives such as sorbic acid, benzoic acid, dehydroacetic acid, p-hydroxybenzoic acid, Vantocil IB and Neupectin-L, Vantocil IB and Neupectin-L were a potent antibacterial agent in A-Z 36 culture cell system and were not affected in hydrolysis of substrate as compared with the case of control. Ethanol yield(6.9 g/ℓ) in system of addition of 0.1% Neupectin-L was slightly higher than that in control(6.4 g/ℓ). When 2% starch was fed five times in fed-batch culture with 0.1% Neupectin-L, ethanol yield and productivity were 34 g/ℓ and 2.0 g/ℓ/day, respectively.

잡음환경에서 음성-영상 정보의 통합 처리를 사용한 숫자음 인식에 관한 연구

이상원,박인정,Lee, Sang-Won,Park, In-Jung 대한전자공학회 2001 電子工學會論文誌-CI (Computer and Information) Vol.38 No.3

본 논문에서는 한국어 숫자음 인식을 위해 음성과 영상 정보를 사용하고, 음성에 사용하는 선형예측계수 알고리즘을 영상에 적용하는 방법을 제안한다. 입력으로 얻어지는 음성신호는 0.95의 매개변수를 통해 고역 신호가 강조되고, 해밍창과 자기상관 분석, Levinson-Durbin 알고리즘에 의해 13차 선형예측계수를 구한다. 마찬가지로, 그레이 영상신호도, 음성의 자기상관 분석, Levinson-Durbin 알고리즘을 사용하여 13차의 2차원 선형예측계수를 구한다, 이러한 음성/영상 신호에 대한 선형예측계수들은 다층 신경회로망에 적용하여 학습이 이루어졌고, 각 레벨의 잡음이 섞인 음성신호를 적용한 결과, 숫자음 '3', '5', '9' 에서 음성만으로 인식한 결과보다 훨씬 좋은 인식결과를 얻을 수 있었다. 결과적으로, 본 연구에서는 영상 신호의 2차원 선형 예측 계수들이 음성인식에 사용될 경우, 특징 추출에 따른 부가적인 알고리즘이 새로 고안될 필요가 없이, 음성특징 계수를 추출하는 방법을 그대로 사용할 수 있으며, 또한 데이터량과 인식율이 잡음 환경에서 보다 향상되는 효율적인 방법을 제시하고 있음을 알 수 있었다. In this paper, a method that apply LP algorithm to image for speech recognition is suggested, using both speech and image information for recogniton of korean numeral speech. The input speech signal is pre-emphasized with parameter value 0.95, analyzed for B th LP coefficients using Hamming window, autocorrelation and Levinson-Durbin algorithm. Also, a gray image signal is analyzed for 2-dimensional LP coefficients using autocorrelation and Levinson-Durbin algorithm like speech. These parameters are used for input parameters of neural network using back-propagation algorithm. The recognition experiment was carried out at each noise level, three numeral speechs, '3','5', and '9' were enhanced. Thus, in case of recognizing speech with 2-dimensional LP parameters, it results in a high recognition rate, a low parameter size, and a simple algorithm with no additional feature extraction algorithm.

경제적 관점에서 본 4대강 살리기 사업

이상원,Lee, Sang-Won 한국수자원학회 2009 물과 미래(한국수자원학회지) Vol.42 No.1

회원칼럼 I - 국민생명, 건축법에 맡길 수 없다.

이상원,Lee, Sang-Won 한국건축구조기술사회 2010 건축구조 Vol.17 No.2

반도체 공정용 플라즈마 발생장치의 종류와 특성

이상원,Lee Sang-Won 한국전기전자재료학회 2006 전기전자재료 Vol.19 No.6