RGB 이미지 기반 학습 모델을 이용한 라이다 반사강도 이미지에 대한 추론 및 3차원 물체인지

강성모 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6

This paper considers object detection in LiDAR. RGB image-based learning model such as YOLOv4 is applied to LiDAR intensity images. This is to examine that camera-based learning models can be applied to LiDAR data. Then, the 2D object detection results in LiDAR intensity images are converted to 3D object detection using point cloud data.

Numerical simulation of structure and no formation of turbulent lean-premixed flames in gas turbine conditions

강성모,김용모,이관수 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12

This study numerically investigates the detailed structure and NO formation in atmospheric and high-pressure leanpremixed flames. Parallel unstructured-grid finite-volume method (FVM) has been developed to maintain the geometric flexibility and computational efficiency for the solution of the physically and geometrically complex flows. In order to realistically represent the complex turbulence-chemistry interaction of high-pressure lean-premixed turbulent flames encountered in gas turbine combustors, a flamelet model based on the level-set approach has been adopted. Special emphasis is given to the effects of pressure and equivalence ratio on the flame front location and NO formation, as well as the dimensionless parameters including turbulent Reynolds number, Re, Damköhler number, Da, and Karlovitz number, Ka in the lean-premixed gas turbine-like situations. Numerical results obtained in this study suggest that the level-set approach in the context of parallel unstructured-grid FVM is capable of realistically simulating the detailed structure and NO formation in the atmospheric and high-pressure lean-premixed flames.

부과방식(PAYG) 공적연금 도입이 출산율에 미치는 영향

강성모,위정범,성주호 한국보험학회 2022 保險學會誌 Vol.129 No.-

The paper employs an overlapping generation model to identify the effects of implementing the PAYG public pension scheme upon the fertility rate and lifetime utility. We find out that the fertility rate largely depends upon the income effect which comes from the difference between the implicit return of PAYG and the return of personal saving. This suggests that Aaron’s theorem could be widely applicable to the economy model with endogenous fertility rate and various coefficients of relative risk aversion through a utility function. As a result, implementing PAYG under the dynamically efficient economy leads to the negative effects which decrease fertility rates and individual utilities simultaneously. 우리는 중첩세대모형을 통하여 PAYG 공적연금제도의 도입이 개인의 출산율 그리고 생애효용에 주는 영향은 연금수익률과 저축수익률의 차이에 따른 소득 효과에 좌우된다는 것을 밝힐 수 있었다. 이는 Aaron의 정리를, 출산율을 내생변수로 한 모형에서 다양한 위험회피계수에 확대 적용할 수 있다는 것을 보여준 것이다. 결론적으로 동적으로 효율적인 경제에서 PAYG 공적연금 도입은 출산율뿐만 아니라 개인 생애효용까지 동시에 감소시키는 부정적 효과를 초래할 수 있다.

당뇨황반부종 환자에서 유리체 절제술시 내경계막 절제술의 유용성

강성모,진희승,문연성,Sung Mo Kang,Hee Seung Chin Yeon Sung Moon 대한안과학회 2007 대한안과학회지 Vol.48 No.6

Purpose: To evaluate the effectiveness of a combined procedure of peeling the internal limiting membrane with vitrectomy in diabetic macular edema. Methods: This study comprised 16 eyes of 16 patients hospitalized during a 1-year period. They were randomized to either a vitrectomy group (10 eyes in 10 patients) or to a combined procedure group (6 eyes in 6 patients). Preoperative and postoperative macular center thickness, best corrected visual acuity and postoperative complications 4 months postoperative were investigated. Results: There were no statistically significant differences in the mean values of preoperative and postoperative best corrected visual acuity (logMAR) between the two groups. The mean values of preoperative and postoperative macular center thickness in the vitrectomy group were respectively 509.50±36.77 and 332.60±91.73; while in the combined procedure group, they were 516.17±55.43 and 333.83±51.64. Again, there were no statistically significant differences between the two groups. At the 4-month follow-up, decreased visual acuity was found in 3 eyes of the vitrectomy group and in 2 eyes of the combined procedure group. Vitreous hemorrhage (3 eyes) and tractional retinal detachment (1 eye) were found in the vitrectomy group and vitreous hemorrhage (2 eyes) was diagnosed in the combined group. Conclusions: In our study, vitrectomy with peeling of the internal limiting membrane was not more effective than vitrectomy alone in decreasing macular edema or in improving best corrected visual acuity. Additional studies of the combined procedure are needed to verify this result.

차세대 초고속 이동체계 인프라 안전관리를 위한 모니터링 방안

강성모,류승기,백종대 한국ITS학회 2018 한국ITS학회 학술대회 Vol.2018 No.11

KNOTS IN S³ ADMITTING GRAPH MANIFOLD DEHN SURGERIES

강성모 대한수학회 2014 대한수학회지 Vol.51 No.6

In this paper, we construct infinite families of knots in S 3 which admit Dehn surgery producing a graph manifold which consists of two Seifert-fibered spaces over the disk with two exceptional fibers, glued together along their boundaries. In particular, we show that for any natural numbers a,b,c, and d with a ≥ 3 and b,c,d ≥ 2, there are knots in S 3 admitting a graph manifold Dehn surgery consisting of two Seifert-fibered spaces over the disk with two exceptional fibers of indexes a, b, and c, d, respectively.

Primitive/Seifert knots which are not twisted torus knot position

강성모 호남수학회 2013 호남수학학술지 Vol.35 No.4

The twisted torus knots and the primitive/Seifert knotsboth lie on a genus 2 Heegaard surface of S3. In [5], J. Dean usedthe twisted torus knots to provide an abundance of examples ofprimitive/Seifert knots. Also he showed that not all twisted torusknots are primitive/Seifert knots. In this paper, we study the otherinclusion. In other words, it shows that not all primitive/Seifertknots are twisted torus knot position. In fact, we give innitelymany primitive/Seifert knots that are not twisted torus knot posi-tion.

Twisted torus knots with graph manifold Dehn surgeries

강성모 대한수학회 2016 대한수학회보 Vol.53 No.1

In this paper, we classify all twisted torus knots which are doubly middle Seifert-fibered. Also we show that all of these knots possibly except a few admit Dehn surgery producing a non-Seifert-fibered graph manifold which consists of two Seifert-fibered spaces over the disk with two exceptional fibers, glued together along their boundaries. This provides another infinite family of knots in $S^3$ admitting Dehn surgery yielding such manifolds as done in \cite{K14}.

EXAMPLES OF KNOTS IN S3 ADMITTING SEIFERT-FIBERED SURGERIES OVER S2 WITH FOUR EXCEPTIONAL FIBERS

강성모 호남수학회 2018 호남수학학술지 Vol.40 No.3

In [4] Miyazaki and Motegi constructed one family ofknots in S3 which admits Dehn surgery producing a Seifert-beredspace over S2 with four exceptional bers. On the other hand,in [3] using doubly hyper Seifert twisted torus knots, the authorconstructed six families of knots in S3 which admit Dehn surgeryyielding a Seifert-bered space over S2 with four exceptional bers. It is questioned in [3] whether or not the family of the knots con-structed in [4] belongs to one of the six families of the knots in [3]. In this paper, we give the positive answer for this question.

Dehn surgeries on middle/hyper doubly Seifert twisted torus knots

강성모 대한수학회 2020 대한수학회보 Vol.57 No.1

In this paper, we classify all twisted torus knots which are middle/hyper doubly Seifert. By the definition of middle/hyper doubly Seifert knots, these knots admit Dehn surgery yielding either Seifert-fibered spaces or graph manifolds at a surface slope. We show that middle/hyper doubly Seifert twisted torus knots admit the latter, that is, non-Seifert-fibered graph manifolds whose decomposing pieces consist of two Seifert-fibered spaces over the disk with two exceptional fibers.