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Siheon Lee,Sungkyun Hong,Seungji Kim,Dayoung Oh,Sangkyung Choen,Mincheol CHOI,Junghee YOON 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.4
Background: Quantitative evaluation of renal cortical echogenicity (RCE) has been tried and developed in human and veterinary medicine. Objectives: The objective of this study was to propose a method for evaluating RCE quantitatively and intuitively, and to determine associations between ultrasonographic renal structural distinction and estimated glomerular filtration rate (eGFR) in canine chronic kidney disease (CKD). Methods: Data were collected on 63 dogs, including 27 with normal kidney function and 36 CKD patients. Symmetric dimethylarginine and creatinine concentrations were measured for calculating eGFR. RCE was evaluated as 3 grades on ultrasonography images according to the distinction between the renal cortex and outer medulla. The RCE grade of each kidney was measured. Results: There was a significant difference in eGFR between the group normal and CKD (p < 0.001). As mean of RCE grades (the mean values of each right and left kidney's RCE grade) increases, the proportion of group CKD among the patients in each grade increases (p < 0.001). Also, severity of RCE (classified as "high" if any right or left kidney evaluated as RCE grade 3, "low" otherwise) and eGFR is good indicator for predicting group CKD (p < 0.001). Conclusions: The degree of distinction between the renal cortex and the outer medulla is closely related to renal function including eGFR and the RCE grade defined in this study can be used as a method of objectively evaluating RCE.
성시헌(Siheon Seong),이성범(Seongbeom Lee),김현철(Hyunchul Kim) 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.1
With the development of the Fourth Industrial Revolution, the use of three-dimensional (3D) printers has drawn attention as an approach to supplementing the limitations of mold processing by reducing various materials, complex shapes, and discontinuation cycles. However, there are limits to its application because its extended manufacturing time and expensive equipment do not satisfy the efficiency requirements of the existing mold method. This paper presents a method for solving the problems of existing 3D printers by producing liquid crystal display 3D printers with low cost, high manufacturing speed, and high precision. And for the verification, products of various shapes were printed and evaluated.
Machine Learning을 이용한 LCD 3D프린터 공정조건 추천시스템 개발
성시헌(Siheon Seong),이성범(Seongbeom Lee),김현수(Hyunsoo Kim),김현철(Hyunchul Kim) 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.2
With the development of the fourth industry, production methods using 3D printers are increasingly being used to compensate for the limitations of mold processing. Under the existing mold method, the production time is slow and no fixed production process exists. These result in low product reliability and expensive equipment, making the existing mold method inefficient and limited in use. This study develops a liquid crystal display(LCD) 3D printer process parameter recommendation system that can solve the unspecified production processes . To indicate the stacking height and direction, the system is divided into X and Y axes, respectively, and each axis is raised from 0° to 90° in increments of 5° to test samples. After manufacture, a hardness test is performed, and the output accuracy and precision are measured. Using a Gaussian regression, we implement the system to recommend grade results from 1 to 9 to workers and verify performance.
제로트러스트 성숙도 진단, 도입계획 수립, 도입효과 측정을 위한 공격자 관점의 접근
이철호(Cheolho Lee),최창진(Changjin Choi),정시헌(Siheon Jeong),곽진(Jin Kwak) 한국정보보호학회 2024 情報保護學會誌 Vol.34 No.3
제로트러스트 도입을 검토하고 있는 조직은 제로트러스트를 구성하는 6개 핵심요소에 대한 자신의 성숙도 수준을 측정하여 목표 수준과의 차이를 식별한 후, 목표 성숙도 수준 달성을 위한 제로트러스트 도입계획을 수립하고, 도입 후 목표 성숙도 수준의 달성정도를 정량적으로 확인할 수 있어야 한다. 이를 위한 접근법 또한 제로트러스트의 기본철학(Never Trust, Always Verify)을 준수해야 하므로, 가장 효과적인 방법은 공격자 관점의 침투시험(Penetration Test, 모의해킹)을 도입하는 것이다. 본 연구는 침투시험을 기반으로 제로트러스트 핵심요소별 성숙도를 측정하는 방법과 제로트러스트 도입 전후 보안성 향상 정도를 정량적으로 측정하는 방법을 제시한다.