Signomial Classification Method with ₀-regularization

이경식,Lee, Kyung-Sik Korean Institute of Industrial Engineers 2011 산업공학 Vol.24 No.2

In this study, we propose a signomial classification method with ₀-regularization (₀-)which seeks a sparse signomial function by solving a mixed-integer program to minimize the weighted sum of the ₀-norm of the coefficient vector of the resulting function and the $L_1$-norm of loss caused by the function. $SC_0$ gives an explicit description of the resulting function with a small number of terms in the original input space, which can be used for prediction purposes as well as interpretation purposes. We present a practical implementation of $SC_0$ based on the mixed-integer programming and the column generation procedure previously proposed for the signomial classification method with $SL_1$-regularization. Computational study shows that $SC_0$ gives competitive performance compared to other widely used learning methods for classification.

종합보고 및 대정부 건의 사항

이경식,Lee Kyung Sik 대한간호협회 1970 대한간호 Vol.9 No.4

한국의 보건 간호교육에 대한 고찰

이경식,Lee Kyung Sik 대한간호협회 1970 대한간호 Vol.9 No.3

The development of public health nursing in this country is delayed due to such factors as the pattern of delivery of medical care which was strictly clinically oriented, comprehensive family health service was over-shadowed by the over-emphasis of contro

백내장 수술 후 스펙트럼영역 빛간섭단층촬영에서 나타나는 시신경 지표 변화

이경식,김용민,김지현,안지민,정우석,최정범,박경수,Kyung Sik Lee,Yong Min Kim,Ji Hyun Kim,Ji Min Ahn,Woo Suk Chung,Jung Bum Choi,Kyoung Soo Park 대한안과학회 2013 대한안과학회지 Vol.54 No.10

Purpose: To assess changes in peripapillary retinal nerve fiber layer (RNFL) thickness and optic nerve head parameters after cataract surgery by using spectral-domain optical coherence tomography (OCT). Methods: Twenty-nine eyes of 26 patients, who underwent cataract surgery, were imaged with spectral-domain OCT before and after surgery to measure peripapillary RNFL thickness and optic nerve head parameters, signal strength (SS), quadrant, 12 clock-hour RNFL thickness, rim area, disc area, cup/disc area ratio, vertical cup/disc ratio, and cup volume. Results: The postoperative RNFL thickness and SS were higher than before surgery (p < 0.05). Regarding optic nerve head parameters, rim area was 0.07 ± 0.10 mm higher than before surgery and disc area, cup/disc area ratio, vertical cup/disc ratio, cup volume were 0.07 ± 0.15 mm, 0.04 ± 0.04, 0.03 ± 0.05, 0.04 ± 0.06 mm, respectively, lower than before surgery (p < 0.05). Conclusions: Cataracts may decrease peripapillary RNFL thickness measurement and SS on OCT scans and change other optic nerve head parameters. Peripapillary RNFL thickness and optic nerve head parameter measurements should be interpreted with caution in eyes with significant cataracts.

시청각 교육 기재 사용

이경식,Lee Kyung Sik 대한간호협회 1971 대한간호 Vol.10 No.5

보건간호 지도자 세미나 종합보고

이경식,Lee Kyung Sik 대한간호협회 1971 대한간호 Vol.10 No.5

비접촉 안압계, 리바운드 안압계, 토노펜, 골드만 압평안압계의 안압 비교

이경식,김세경,김응권,김태임,Kyung Sik Lee,Se Kyung Kim,Eung Kweon Kim,Tae Im Kim 대한안과학회 2014 대한안과학회지 Vol.55 No.1

Purpose: To compare the level of accuracy of intraocular pressure (IOP) measurements attained by non-contact tonometer (NCT), rebound tonometer (RT) Icare<sup>®, and Tono-Pen (TONO-PEN AVIA<sup>®), using Goldmann Applanation tonometer (GAT) as a reference value and to explore their clinical usefulness. Methods: In a prospective study of 71 normal eyes, IOP was measured with NCT, RT, Tono-Pen and GAT. The IOP values of were then compared between the eyes. Results: RT showed statistically most significant agreement with the GAT [ICC 0.811, 95%CI 0.712-0.878]. In analysis of Bland-Altman plots, NCT showed the smallest mean bias (+0.2 mm Hg) and widest CI (95%CI; ±5.05 mm Hg), RT showed relatively small mean bias (-0.7 mm Hg) and narrowest CI (95%CI; ±3.75 mm Hg). Conclusions: There was a significant agreement between the RT and the GAT measurements. We expect RT to be considered as a reliable alternative when IOP measurement with GAT is not feasible. J Korean Ophthalmol Soc 2014;55(1):47-53

대학전공별(大學專攻別) 전문직학생(專門職學生)들의 인구관련문제(人口關聯問題)에 대한 연차적(年次的) 변화(變化) 연구(硏究)

이경식,김화중,Lee, Kyung-Sik,Kim, Hwa-Joong 대한예방의학회 1976 예방의학회지 Vol.9 No.1

This study was a part of large scale of a prospective study on attitudes of professional students in medicine, nursing and teaching toward population related issues in Korea. The study was first conducted in May 1974 and then in May 1975 for the 1974 class cohot using a questionaire consisted of attitude scales and other items developed by Lee. The purpose of stuay was twohold, namely, to determine the difference in students among specializations on one hand and between the first and second years in the 1974 class cohot regarding tile subject matter. A one-way analysis of variance was used for attitude scale, and absolute and relative frequency were computed for the analysis of non-attitude scale items by employing Fishers' Ratio and Duncan's multiple range test at 5% level and chi square test at 5% level as significance tests. The hypothesis 'students in health profession are more likely to have positive attitudes toward population related issues progressively as class year advances than students in teaching profession' was tested and the following results were obtained: 1) Nursing students were more likely to display favarable attitudes toward family planning than medical or teaching students although the class cohot showed slightly negative improvement in the second year. Medical and teaching students apperaed to have slightly improved attitudes in the second year. 2) Respondents in general perceived national family planning program as a means of population control and this tendency was more true among nursing students as the class year advances than two other professional groups of students. Students in teaching profession appeared to perceive it more as a means to improve individual family welfare while health students were likely to see as to improve maternal and child health. This tendency was progressively improved as the class year advanced. 3) The majority of students regardless of their respective specializations believed that family planning program should be directed toward the improvement of individual family welfare. No progressive changes in the class cohot were observed. 4) About the plan to use contraceptives in future, no singnificant differences were observes among different specializations nor in different class years. However, the majority was confirmed to have a plan to use contracepives in future. An increasing proportion of the undecided category was observed, as class year advanced among health students. 5) Students in health profession were found to be more favorable about 'more leisure opportunities' as motive for limiting number of children whereas education students indicated the reasons as 'facilitate ambitions' and 'economic base' The progressive changes toward positive direction in both groups were observed as the class years advanced. 6) Attitudes toward induced abortions of the health students were observed to be positively related to class years while an inverse relationship was found in teaching students who showed much less favor in the subject matter than health students. This phenomenon may be due to the different exposure to learning environments unique to respective specializations. 7) Health students were found to have more favorable attitudes toward population education in general than the teaching students. The teaching students appeared to have changed more to the negative direction when they became the second year while no such development was observed in health students. The teaching students seemed to hold a very conservative position with regard to sex education in schools. 8) About the equality of sexes, the nursing group was found to be most favorable while the reverse was true in the teaching group. A change in the negative direction as the class year advanced was found in the teaching group. 9) About questions related to fertility values-the 10 percent of respondents regardless of specialization indicated that they would maintain their single status in future, however no ch

도시가스 고압배관에 대한 정량적 위험평가 현장적용

이경식(Lee Kyung Sik),조영도(Jo Young Do),이진한(Lee Jin Han),류영돈(Ryou Young Don) 한국가스학회 2008 한국가스학회 학술대회논문집 Vol.2008 No.11

고려전기의 권농과 전시과

이경식(Kyung Sik Lee) 연세대학교 국학연구원 2004 동방학지 Vol.128 No.-