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LED 헤드램프의 배광 시 광저하율 추정을 통한 전류치 최적화
이우열(Wooyeol Lee),한희복(Huipok Han) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
This study suggests a method of optimizing the value of current to satisfy LED headlamp light distribution regulations. To this end, when measuring light distribution, the value of the increase in current required for light deterioration is optimized by inferring the value of the light reduction rate according to the temperature increase in the lamp.
順氣除濕方이 高脂肪食餌로 유발된 肥滿 白鼠에 미치는 영향
이우열(Lee Wooyeol),신현규(Shin Hyunkyoo) 한국한의학연구원 2008 한국한의학연구원논문집 Vol.14 No.1
Objective : In order to investigate the effects of Soongijeseub-bang(here in after referred to SJB) on the obese gene and obese inhibitory, C57BL/6 mice were induced by high fat diet. Methods : C57BL/6 mice were divided into three groups(normal, high fat diet with control, high fat diet with SJB extract) and fed for 15 weeks. And measured body weight change, the weight change of the adipocytes in body, the levels of ALT, AST, creatinine, total cholesterol, LDL-cholesterol, HDL-cholesterol, triglyceride, NEFA(non-esterified fat acid), glucose in serum and the expression of β3AR, leptin, and TNF-α gene in primary adipocytes and adipocytes tissue. Results : The following results were obtained in this study. 1. SJB 500 ㎎/㎏ extract group showed significant decrease in final weight. 2. SJB 500 ㎎/㎏ extract group showed significant decrease in the amount of adipocyte in weight. 3. All experimental group showed significant decrease in ALT and AST levels. 4. All experimetal group did not show significant decrease in glucose and creatinine levels. 5. All experimental group showed significant decrease in total cholesterol, LDL-cholesterol, triglyceride and NEFA levels. HDL-cholesterol were increase significantly in SJB 500 ㎎/㎏ extract group. 6. SJB 500 ㎎/㎏ extract group showed significant decrease in leptin levels. 7. All experimental group showed significantly increased expressions of β3AR in primary adipose cell and 3T3-L1 cell, and those of leptin in primary adipose cell and 3T3-L1 cell were decreased significantly. SJB 100 ㎕/㎖ extract group showed significant decrease in the expression of TNF- α. 8. SJB 500 ㎎/㎏ extract group showed decrease in the size of adipocyte in adipocytes tissue. 9. All experimental group showed significant decrease in adipose vacuoles in liver tissue.
LED 램프 방열시스템의 구성과 함수 변경을 통한 개선 제안
이우열(Wooyeol Lee),한희복(Huipok Han) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
본 연구는 LED 램프 방열시스템의 구성을, 하드웨어와 소프트웨어의 측면에서 설명하고 있다. 또한, 해당 방열시스템을 구성하고 있는 함수들의 변경을 통해 방열시스템을 개선할 수 있는 방법을 제안한다. This study explains the configuration of the LED lamp heat dissipation system in terms of hardware and software. In addition, we propose a method to improve the heat dissipation system by changing the functions that make up the heat dissipation system.
어포던스 기반의 인간-기계 협업 모델을 이용한 제조 시스템 구현 연구
오영광(Yeong Gwang Oh),주익찬(Ikchan Ju),이우열(Wooyeol Lee),김남훈(Namhun Kim) 대한산업공학회 2015 대한산업공학회지 Vol.41 No.1
Modeling and control of human-involved manufacturing systems poses a huge challenge on how to model all possible interactions among system components within the time and space dimensions. As the manufacturing environment are getting complicated, the importance of human in the manufacturing system is getting more and more spotlighted to incorporate the manufacturing flexibility. This paper presents a formal modeling methodology of affordance-based MPSG (Message-based Part State Graph) for a human-machine collaboration system incorporating supervisory control scheme for flexible manufacturing systems in automotive industry. Basically, we intend to extend the existing model of affordance-based MPSG to the real industrial application of humanmachine cooperative environments. The suggested extension with the real industrial example is illustrated in three steps; first, the manufacturing process and relevant data are analyzed in perspectives of MABA-MABA and the supervisory control; second, the manufacturing processes and task allocation between human and machine are mapped onto the concept of MABA-MABA; and the last, the affordance-based MPSG of humanmachine collaboration for the manufacturing process is presented with UMLs for verification.