The Impact of the R&D Investment on the Capital Cost of Equity

이정길 한국로고스경영학회 2016 로고스경영연구 Vol.14 No.3

This study analyzes the R&D investment to investigate the path of the impact on the corporate value. Especially, we focused on the effects of the R&D investment on the cost of equity. We used unbalanced panel data analysis for this purpose. The results of this study are summarized as follows. First, according to the analysis of the model (1), R&D expenditures have negative effects on the cost of equity. It means that the high R&D intensity has the low cost of equity. This result shows that the research and development are reducing the risk of the company, too. As R&D investment has risk reduction effects, we can expect that the corporate value with high R&D investment increases. According to this result, R&D expenditures may affect on lowering the capital cost of enterprise and the future cash flows at the same time. Second, other variables which show significant effects in the model (1) are company size, sales growth, earning volatility, beta coefficients. The scale factor shows a negative coefficient, meaning that the larger enterprise scale is the low capital cost. Sales growth appears to affect the negative direction in the company's cost of capital (risk reduction). The volatility of the beta coefficient and net income volatility also seems to be getting risk mitigation. These results are same in the model (1) and (2). Third, the majority shareholder stake employed to test the hypothesis 2. The result does not show a significant effect on the equity cost of capital. It may be due to majority shareholder stake is not suitable as a substitute for an active value variable. Or, It may be attributable to that the effective board of directors has no economic significance.

도서 대출이 학업성취도에 미치는 영향에 관한 연구 : 부산 B대학을 중심으로

이정길,심재륜,문승호 한국자료분석학회 2013 Journal of the Korean Data Analysis Society Vol.15 No.5

This study analyzes the academic effect of book lending from university library. The data are each semester grade and book lending numbers of individual students who graduated in February 2013. Other independent variables are academic classification, sex, high school, number of major, age, course credits. Test results are as follows. First, number of book lending has positive effects on the academic grade. But, the magnitude of coefficient is very small. Second, age and course credits affect positively the grade. Third, academic classification-verbal, and non-verbal, high school, sex have no effect on the grade. But, the number of major affects the grade. Above results have some meanings on the library policy and teaching-learning. First, library have to consider the various books for in-depth study in the process book buying. Second, Some subjects have to be designated as intensive course and to be used various books for study in that subject. This subjects may discuss based on the various books. 본 연구는 대학 도서관에서의 도서 대출이 학점에 미치는 영향을 분석한 것이다. 자료는 2013년 2월 부산 B대학교를 졸업한 학생들의 매학기별 성적과 도서대출 자료를 활용하였다. 도서 대출권수외의 독립변수는 연령, 수강학점, 계열구분, 남녀구분, 출신고교, 복수전공여부 등이다. 분석결과는 다음과 같이 요약된다. 첫째, 도서 대출권수는 학생들의 성적에 유의적인 양(+)의 영향을 주는 것으로 나타난다. 그러나 도서대출 1권이 미치는 성적에의 영향의 절대치는 크지 않은 것으로 나타났다. 둘째, 연령이나 수강학점 등도 학생들의 성적에 유의적인 영향을 준다. 셋째, 계열구분이나 남녀, 출신고교, 복수전공 여부에 따른 도서 대출의 차별적인 영향에 대한 분석결과 복수전공 여부에 따른 영향이 차이가 있는 것으로 나타났다. 이상과 같은 분석결과는 도서관의 도서 정책이나 교수학습에 있어서 몇 가지 시사점을 제시해준다. 첫째, 도서 확보의 과정에서 주요 교과목의 심화학습에 필요한 다양한 교재를 갖출 필요가 있는 것으로 보인다. 즉 학생들이 해당 과목을 심층적으로 공부함에 있어서 필요한 다양한 서적들을 구비함으로써 학생들의 도서 활용과 성적간의 상관관계를 높일 수 있을 것으로 보인다. 둘째, 교수학습과 관련하여 학생들의 심화학습이 요구되는 교과목을 사전적으로 설정하고, 해당 과목의 경우, 교수 학습의 과정에서 심화학습을 위한 다양한 도서를 읽고 토론하는 등의 학습을 도입할 필요가 있을 것으로 보인다.

Angular Positioning of Stent Increases Bowel Perforation after Self-Expandable Metal Stent Placement for Malignant Colorectal Obstruction

이정길,유광호,권창일,고광현,홍성표 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.4

Background/Aims: Some factors like stent wires, balloon dilatation and use of guide wires seems to increase perforation after self-expandable metal stents (SEMS) placement, but few studies mentioned about the relationship between angulation of malignant stricture and perforation. The present study aimed to confirm that more angular positioning of stents increases perforation. Methods: This study was conducted with retrospectively evaluation at Digestive Disease Center, CHA Bundang Medical Center, CHA University. Between January 2002 and August 2011, SEMSs was inserted in 130 patients with malignant colorectal obstruction. We studied the difference in the angle of stenosis between perforation and non-perforation groups using fluorography images. Results: SEMS insertion was performed in 130 cases of obstruction due to colon cancer. Perforation occurred in eight patients (6.2%) of them. Thirteen cases were excluded from the analysis due to poor fluoroscopic images. Among the eight patients with perforation, the mean stenosis angle was 109.9° compared to 153.1° in the nonperforation group, indicating that the angle was more acute in the perforation group (p=0.016). Conclusions: This study shows that more angular positioning of stent increases bowel perforation after SEMS placement for malignant colorectal obstruction.

동물의 스크래피양 해면상뇌증 (프리온병) : 문헌조사 a Review

이정길,강문일,이채용,조재진 한국수의공중보건학회 2001 예방수의학회지 Vol.25 No.1

Scrapie-like spongiform encephalopathies (SEs) in animals are chronic diseases characterized by long incubation period followed by development of clinical signs associated with progressive loss of central nervous function. Before 1980, naturally occurring SEs had been recognized in four species: in sheep and goats as scrapie; in humans as kuru, Creutzfeldt-Jakob disease, Gerstmann-Straussler-Scheinker syndrome, and fatal familial insomnia; in minks as transmissible mink encephalopathy. Since then, however, such transmissible encephalopathies have been diagnosed in a growing number of other species. An SE has been found to be the cause of chronic wasting disease in captive and free-living deer. “Mad cows” dying of bovine spongiform encephalopathies (BSE) present a major agricultural problem in Great Britain and pose a potential public health dilemma. In association with the BSE epidemic in domestic cattle in Europe, SEs have been diagnosed in domestic cats and 10 species of zoo animals in or from Great Britain. In the present communication, scrapie-like SEs occurred in dom7estic and wild and zoo animals are reviewed mainly in view of etiology, epidemiology, clinical signs, and diagnosis.

도수 견인을 이용한 족관절 관절경술의 경험

이정길,김갑래,이진영,이의수,이재희,Lee, Jeong-Gil,Kim, Gab-Lae,Lee, Jin-Young,Lee, Eui-Soo,Lee, Jae-Hee 대한족부족관절학회 2013 대한족부족관절학회지 Vol.17 No.4

Purpose: Number of arthroscopic surgery is gradually increasing with development of its equipment and technique. Arthroscopic ankle surgery performed with the traction device has various complications and need more time for preparation. We investigated whether the complication rate increased when surgery was performed without the traction device, and compared the complication rate of arthroscopic surgery with the traction device. Materials and Methods: From January 2009 to June 2012, arthroscopic ankle surgery was performed without the traction device in four hundred eleven cases. There were two hundred sixty-one males and one hundred fifty females. The average age at operation was 35 years (range, 17-56), and the average follow up period was 28 months (range, 12-41). Postoperative symptoms and complications were checked. Results: There were difficulties performing arthroscopic surgery without the traction device in five cases with severe traumatic osteoarthritis. However, after burring and shaving, we had enough space to work on. Superficial peroneal nerve symptom was found in two cases, grooving of talus was found in 11, and saphenous vein injury was found in five. Since preparing for the traction device was unnecessary, we were able to save time with the mean duration of surgery of 50 minutes (range, 30-120). Conclusion: With only manual traction, we could explore the entire ankle joint without damage on cartilage. Yet, skilled arthroscopic technique will be necessary for arthroscopic surgery without the traction device.

수업년한이 연장된 후의 수의학교육

이정길 대한수의사회 1991 대한수의사회지 Vol.27 No.12

우리나라 수의학 교육기관의 개편에 대하여$\cdots$

이정길 대한수의사회 2000 대한수의사회지 Vol.36 No.7

동물질병과 면역(1)

이정길 대한수의사회 1984 대한수의사회지 Vol.20 No.2

일반원고 2 - 12지 이야기(10) - 닭 - 다섯 가지 덕을 지닌 동물

이정길,Lee, Jeong-Gil 대한수의사회 2016 대한수의사회지 Vol.52 No.10

자발성 척추 경막외 농양의 수술적 치료

이정길,김수한,김은성,김태선,정신,김재휴,강삼석,이제혁,Lee, Jung-Kil,Kim, Soo-Han,Kim, Eun-Seong,Kim, Tae-Sun,Jung, Shin,Kim, Jae-Hyoo,Kang, Sam-Suk,Lee, Je-Hyuk 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8

Objective : The goal of this study was to recognize the clinical feature and associated risk factors in spinal epidural abscess(SEA), and to improve the outcome accordingly. Methods : A retrospective study was performed in 14 patients with SEA who underwent surgical intervention at our hospital between 1990 and 1999. Results : After a mean follow-up period of 10.2 months(range, 1-57 months), 8 patients had no or minimal deficits, 4 patients had severe paresis or plegia and/or bowel/bladder dysfunction, and 2 patients died due to medical complications. Staphylococcus aureus was the predominant pathogen, isolated in 9 patients(64.3%). Cervical and thoracic spinal epidural abscesses showed a tendency to develop rapidly and were associated with severe neurological deficits. Conclusion : Thoracic spinal epidural abscesses were associated with a poorer prognosis than those in other regions. Therefore, it should be treated more aggressively. Good neurological recovery can be obtained despite severe neurologic deficit when treated by early diagnosis and prompt surgical intervention.