Application of Lean System Principles in Healthcare Services Using Arena Simulation

يهدف هذا البحث لتطبيق مبدأ نظام  الترشيق في قسم الطوارئ لمستشفى الشيخ زايد  حيث يستخدم هذا المبدأ من اجل تقليل  الضياعات واوقات الانتظار لزيادة رضا المريض. ان استخدام مبدأ لترشيق يحدد الضياعات ولكن لا يحدد اي الضياعات تحتاج للتقليل لذلك يتم الاعتماد على انظمة المحاكاة . تم إنشاء مخطط تدفق المرضى لدراسة المدة الإجمالية لبقاء المريض في قسم الطوارئ واوقات الانتظار واستغلال الموارد البشرية. حيث كانت النتائج من نموذج المحاكاة وكما يلي: الوقت الكلي للمريض الواحد من بداية دخول قسم الطوارئ الى خروجه (65 دقيقة)  و عدد امرضى الواردين للقسم خلال الدوام الصباحي (241 مريض)  من ناحية اخرى فأن معدل استغلال الموارد البشرية كانت ( الاطباء  83% الممرضين 13% وموضفي الاستعلامات 95%). وهذا يوضح قابلية وفعالية تطبيق مبدأ نظام الترشيق باستخدام نموذج محاكاة كأداة للتنفيذ المسبق لتحسينات في قطاعات الرعاية الصحية.This research aims to apply lean principles to the Emergency Department (ED) at Sheikh Zayed Hospital. Lean techniques are used in order to eliminate waste, waits and increased patient satisfaction. Lean defines the wastes but not identify which waste should be eliminated for this reason Arena 14.00 Rockwell simulation software used to analyze the ED performance. Patient's flow chart was created to study the total duration of patients stay in the ED, the waiting time and the utilization of resources based on the lean principles approach. The results identified and concluded from simulation model were as the follows, the patient flow time was (65) minute for each patient (total time that patient spent from the beginning of his entry into the ED until he discharged), while patient throughput in morning shift about (241) patient (the number of patients attending the department during morning hours). On the other hand, the utilization ratio of doctors, nurses, receptionists were (83 %, 13 %, and 95 %) respectively. This is demonstrating the applicability and effectiveness of lean principles to ED processes using the simulation model as a pre-implementation tool for improvements in health care sectors.&nbsp

STEP- Based Assembly Feature Recognition Using Attribute Adjacency Graph for Prismatic Parts

This paper introduces the concept of STEP AP203(STandard for Exchange of Product model data) an ISO standard as a neutral format for exchange of CAD model data between different CAD/CAM systems, and how STEP AP 203 data is stored and how the feature information can be extracted and recognized from STEP file. In this paper a hybrid (graph and rule) based approach is used to recognize the features of mechanical prismatic parts. The Attribute Adjacency Graph (AAG) and Attribute Adjacency Matrix (AAM) approaches are used to recognize the form features, and rule based approach is used to recognize assembly features.The proposed methodology in this paper has been completely implemented by designing an integrated system called STEP-based Assembly Sequence Planning (ST-ASP) system. The (ST-ASP) system is built by using Visual Basic 6.0 supported by Solid works 2011 package and implemented on (HP Pavilion dv6) PC. The (ST-ASP) system is directed to 3D prismatic parts. The form features explored in this system include both depression and protrusion features, and the assembly mating relations explored in this system include; against, fit, and insert which is used in recognize assembly features. Finally the system has been tested to carry out a case study to demonstrate the feasibility of the proposed methodology.Keywords:STEP, feature recognition, form feature, assembly feature, mating relations, attribute adjacent graph (AAG)