The purpose of this research is to study the effect of a safety system provided for external wall plastering activity on productivity by studying a construction of commercial buildings. The safety system composed of (1) stable scaffolding system (2) providing clean and not slip walkways on the scaffold (3) installation of handrails not less than 0.90 meters in height along sides of the scaffold (4) installing safety nets around outside perimeters of the scaffolding (5) indicating working area (6) installing stairs (7) providing protection for people who works below (8) providing tools and equipments for transporting material which are safe and ready for using and (9) providing personal protective equipment for workers. Cost of the safety system is 79665 baht for a wall area of 1510 m2 or approximately 53 baht/m2. The prevention cost is quite high because it is an initial investment cost. However contractors could repeat theirs used on future projects. Productivity rates for prior and after the used of safety system are 1.16 and 1.13 m2/person/hr respectively. The productivity declines for approximately 3%. In addition our study found an impact of predecessor activity which is a brick laying activity. If brick walls are not well aligned and plumbed the working time for wall plastering could take longer for 8%. Meanwhile the wall plastering productivity could decrease for 11% and labor cost could increase for 12%.

This paper is a survey research. The objective is to study the factors of Social Adjustment of Technical Education Faculty Students B.S. of Technical Education (5 years curriculum) Faculty of the industrial education Rajamangala University of Technology Phra Nakhon. The random sampling is conducted within the full-time students from 3 majors. The random sampling technique in this paper is derived from Krehbiel-Morgan table. The total number of sample is 167 students. Research Methodology This paper uses the survey method to collect the data. The data analysis process is based on the average percentage value of standard deviation and t-test F-test techniques. The research results can be summarized as follows: 1. Students with different genders have overall social adjustment ability indifferently. 2. Students with different ages have overall social adjustment indifferently. This implies that age is not a factor in social adjustment. 3. Students who graduated from different curriculum have overall social adjustment ability differently. The students who graduated from vocational-qualification curriculum have overall social adjustment ability higher than students who graduated from academic-qualification curriculum. In specific aspect of social adjustment to classmate the result is also the same. 4. Students with different sequence of birth have overall social adjustment ability indifferently. 5. Students with different family status in society have overall social adjustment ability indifferently. 6. Students with their parents in different occupation have overall social adjustment ability indifferently. 7. Students with different average-income-per-month families have overall social adjustment ability indifferently. However in specific aspect of social adjustment to general person the students with higher average-income-per-month families have social adjustment ability better than the students with lower average-income-per-month families. 8. Students with different family characteristics have overall social adjustment ability differently. The students with large family have overall social adjustment ability higher than students with small family.

โครงการวิจัยนี้ มีวัตถุประสงค์เพื่อศึกษาและเปรียบเทียบประสิทธิภาพการตัดเฉือนของโปรแกรมงานกัดด้วยเครื่องกัดอัตโนมัติสำหรับการผลิตชิ้นส่วนในอุตสาหกรรม โดยการเปรียบเทียบทิศทางการกัดงานที่ผ่านการกัดโดยใช้ G41 และ G42 เอ็นมิลล์่ขนาด 12 มม. 4 คมตัดชิ้นงานที่ใช้ในการทดสอบเป็นเหล็ก S45C โดยกัดชิ้นงานที่ระยะทาง 3000 มม. ใช้เครื่องกัดจำนวน 3 เครื่อง การวิจัยนี้ทดลองภายใต้เงื่อนไขเดียวกัน ผลการวิจัยและทดสอบข้อมูลทางสถิติโดยการเปรียบเทียบโปรแกรมการกัดงาน โดยใช้ G41 และ G42 ปรากฎว่าชิ้นงานที่ผ่านการกัดงานโดยใช้ G41 และ G42 มีความแตกต่างกันอย่างมีนัยสำคัญ ที่ระดับนัยสำคัญ 0.05 โดยชิ้นงานที่ผ่านการกัดงานโดยใช้ G41 การสึกหรอที่ดอกเอ็นมิลล์จะเกิดขึ้นน้อย แต่ผิวที่ได้จะมีความหยาบส่วนชิ้นงานที่ผ่านการกัดงานโดยใช้ G42 การสึกหรอที่ดอกเอ็นมิลล์จะเกิดขึ้นมาก แต่ผิวที่ได้จะมีความละเอียดมากกว่า