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랜덤 포리스트를 이용한 비제어 급성 출혈성 쇼크의 흰쥐에서의 생존 예측
최준열,김성권,구정모,김덕원,Choi, J.Y.,Kim, S.K.,Koo, J.M.,Kim, D.W. 대한의용생체공학회 2012 의공학회지 Vol.33 No.3
Hemorrhagic shock is a primary cause of deaths resulting from injury in the world. Although many studies have tried to diagnose accurately hemorrhagic shock in the early stage, such attempts were not successful due to compensatory mechanisms of humans. The objective of this study was to construct a survival prediction model of rats in acute hemorrhagic shock using a random forest (RF) model. Heart rate (HR), mean arterial pressure (MAP), respiration rate (RR), lactate concentration (LC), and peripheral perfusion (PP) measured in rats were used as input variables for the RF model and its performance was compared with that of a logistic regression (LR) model. Before constructing the models, we performed 5-fold cross validation for RF variable selection, and forward stepwise variable selection for the LR model to examine which variables were important for the models. For the LR model, sensitivity, specificity, accuracy, and area under the receiver operating characteristic curve (ROC-AUC) were 0.83, 0.95, 0.88, and 0.96, respectively. For the RF models, sensitivity, specificity, accuracy, and AUC were 0.97, 0.95, 0.96, and 0.99, respectively. In conclusion, the RF model was superior to the LR model for survival prediction in the rat model.
디지털 환경에서의 복잡한 정보구조 수용이 가능한 OTT 앱(App) 디자인 연구
최준열 한국애니메이션학회 2017 애니메이션연구 Vol.13 No.4
This study aims to find out problems when applying newly developed design concepts to actual development according to a hybrid web development method based on the design guide of Android TV and derive a design concept to solve them. I was able to derive 4 design concepts-Performance, Flexibility, Leanback, and Maintenance-from the perspective of the service provider who developed and operated services. However, I felt the need to verify issues when applying these designs concepts to actual development and tried to improve the design concepts derived from the previous research through experiments in this study. To do this, I set up an improved design concept by collecting issues while actually developing a 본 연구에서는 안드로이드 TV의 디자인 가이드를 기반으로 하이브리드 웹 개발 방식에 맞도록 연구자가 새롭게 정립한 디자인 콘셉트를 이용하여 실제 개발에 적용했을 때 발생되는 문제점을 파악해보고 이를 해결할수 있는 디자인 콘셉트를 도출해보고자 한다. 연구자는 서비스를 개발하고 운영하는 사업자 관점에서 퍼포먼스(performance), 플렉서빌리티(flexibility), 린백(leanback), 메인터넌스(maintenance) 등 4가지 디자인 콘셉트를도출할 수 있었다. 하지만 이 디자인 콘셉트를 실제 개발에 적용하였을 때 어떤 이슈가 발생할지에 대한 검증과정이 필요함을 느끼고 본 연구를 통해 기존 연구에서 도출한 디자인 콘셉트를 실험을 통해 개선해보고자 하였다. 이를 위해 실제로 하이브리드 앱을 개발하면서 도출된 이슈를 수집하여 개선된 디자인 콘셉트를 정립하고 이를 기반으로 개선된 버전의 OTT 앱 디자인을 제안해보았다.
최준열,조준형,최윤자 대한임베디드공학회 2018 대한임베디드공학회논문지 Vol.13 No.6
As a result of the technological advances in the E / E system, automotive system can provide advanced functions for safety and comfort. In addition, mechanical systems is changed to the electronic system. And the systems perform cooperative functions through communication. So the E / E system becomes more complicated as the size of the system increases. In order to secure the safety of complicated E / E system, ISO26262 standard require that Freedom from Interference and Sufficient Independence be met. In this paper, we propose a software scheduling method that can guarantee the independence between decomposed components after software decomposition and software development of ASIL D level EPB (Electronic Parking Brake) system