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최원식(Wonsik Chio),박종민(Jongmin Park),권순구(Soongoo Kwon),정성원(Sungwon Chung),권순홍(Soonhong Kwon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
GFRP(glass fiber reinforced plastics) have lots of good points such as light weight, thermal resistance and strong mechanical characteristics. So GFRP is applied to so many industrial area. In this paper, the relationship between test conditions and surface roughness is examined from the drilling experiment, which is the drilling 1000rpm, 1400rpm, 1800rpm with φ 10㎜ of coated drill, HSS regular drill and EX-GDX drill. The results are analysed with consideration with test conditions and surface roughness according to drill types..
Characteristic of Friction on Texturing Bearing Steel with Ultrasonic Hole Machine
Mijung Shin(신미정),Angga Senoaji H,SoonHong Kwon(권순홍),SungWon Chung(정성원),SoonGoo Kwon(권순구),JongMin Park(박종민),JongSoon Kim(김종순),WonSik Choi(최원식) 한국트라이볼로지학회 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.31 No.1
We carry out experiments to characterize textured bearing steel with varying hole density and depth. Textured surface is believed to reduce the friction coefficient, and improve performance and wearing caused by third-body contact. We employ three lubrication regime conditions based on the Stribeck curve: boundary lubrication, mixed lubrication, and hydrodynamic lubrication. Ultrasonic machining is an untraditional machining method wherein abrasive grit particles are used. The hammering process on the work piece surface by abrasive provides the desired form. In this study, we create multi-holes on the bearing steel surface for texturing purposes. Holes are formed by an ultrasonic machine with a diameter of 0.534 mm and a depth of about 2-4 mm, and they are distributed on the contact surface with a density between 1.37-2.23%. The hole density over the surface area is an important factor affecting the friction. We test nine types of textured specimens using four times replication and compare them with the untextured specimen using graphs, as well as photographs taken using a scanning electron microscope. We use Analyzes variant in this experiment to find the correlation between each pair of treatments. Finally, we report the effect of hole density and depth on the friction coefficient.
A way of measuring learner's ongoing changes of interest and comprehension
Hun Jeon(전훈),Sun-Hee Back(백선희),Yoonkyung Chung(정윤경),Eunsoo Cho(조은수),Soongoo Kwon(권순구),Eun Mo Yeon(연은모),Min-Hye Lee(이민혜),Yeonhee So(소연희),Dong Sung Choi(최동성),Sung-il Kim(김성일) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
This study conducted to tried to find a way of on-line assessment of learner's interest and comprehension during interactive learning process. The result of experiment confirmed that learners' behavior patterns acquired from log data could be good predictors of learner s level of interest and comprehension in actual performance on KORI program. To predict learning outcome depending on the behaviors of individual learners, self-efficacy and mastery goal orientation were measured as individual differences. Then, participants were asked to use TA program KORI program at home for ten days and their response patterns were recorded through network. After using KORI, the levels of interest and comprehension were measured. As the result of multiple regression analysis, each learner' s interest and comprehension were predicted depending on the combination of log data captured on real-time. This prediction process was done differently depending on learners' characteristics. Since equations which predict learners' interest and comprehension are different depending on learners' characteristics, differential interfaces should be provided depending upon changes in their level of interest and comprehension.
The Characteristic of Reward in Computer Assisted Learning
Eun Mo Yeon(연은모),Sun-Young Lee(이선영),Yoonkyung Chung(정윤경),Eun Soo Cho(조은수),Soongoo Kwon(권순구),Hun Jeon(전훈),Kye-Hyeng Lee(이계형),Sung-Hyun Yoon(윤성현),Yeonhee So(소연희),Sung-il Kim(김성일) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
Computer Assisted Learning (CAL) is quite different from in many aspects. CAL provides individualistic learning environment and facilitates autonomy of the learner. Thus the learners who uses CAL program has more sense of control and engages in more strategic learning than conventional learning environment. In this experiment, we used KORI (KORea university intelligent agent) which is a new type of ITS adopting TA (Teachable Agent) that fosters learning by teaching. So, we investigated the critical motivational factor that have influences in CAL learning and the effects of reward in CAL are another area of our interest. Thus, we divided two conditions that presence of reward and absence of reward. The 174 elementary school students(5th) were participated and they are randomly assigned the one of the reward conditions. Before entering the experimental instruction, all participants measured about metacognition, self-efficacy and goal orientation questionnaire as independent variables. Then, Participants were instructed of method of using KORI program and asked to study for ten days with KORI program at least 20 minutes everyday in their home, about 10 days. After 10 days, they were rated interest and comprehension. Regression results suggest that regardless of the presence of reward, metacognition is a positive predictor in interestingness. It indicate that metacognitive skills are required in CAL learning situation irrespective of reward. But on comprehension in the absence of reward, only self- efficacy appeared to be a positive predictor. In the presence of reward, performance goal orientation showed as a negative predictor of comprehension, whereas self-efficacy was a positive predictor. This result suggest that presence of reward especially interferes learning process of performance goal orientation in CAL learning situation. It could be interpreted that reward interferes the learning process of performance goal orientation by debilitating intrinsic motivation.