Effects of peer-led debriefing using simulation with case-based learning: Written vs. observed debriefing
NURSE EDUCATION TODAY
Authors: Ha, Eun-Ho
Abstract
Background: Peer-led written debriefing (PLWD) and peer-led observed debriefing (PLOD) are types of peer-led debriefing. Despite their advantages, these methods are sparingly used among debriefing experts. Objective: To identify effects of peer-led debriefing (written versus observed) using simulation with case-based learning (CBL) and compare levels of satisfaction with CBL, debriefing, and simulation-based learning (SBL) between the two groups. Design: Quasi-experimental study used a pretest-posttest non-equivalent control group. Setting: Department of Nursing in C province, South Korea. Participants: Sixty-nine third-year undergraduate nursing students (PLWD, n = 33; PLOD, n = 36). Methods: Differences in clinical performance competency, and satisfaction of CBL, SBL, and debriefing between the PLWD and PLOD groups were determined. Results: Clinical performance competency scores of posttest in both the PLWD and PLOD groups were significantly higher than those of pretest. There were no significant differences in any item except for item of 'communication' (t = -2.150, p = .047) between the PLWD and PLOD groups. There were no significant differences in satisfaction with CBL (t = -0.874, p = .385), simulation (t = -0.701, p = .485), or debriefing (t = -1.024, p = .309) between the two groups. Conclusion: This study suggests that both the PLWD and PLOD could be used to achieve students' learning outcomes when debriefing experts are unavailable.
A new method to retrieve the diurnal variability of planetary boundary layer height from lidar under different thermodynamic stability conditions
REMOTE SENSING OF ENVIRONMENT
Authors: Su, Tianning; Li, Zhanqing; Kahn, Ralph
Abstract
The planetary boundary layer height (PBLH) is an important parameter for understanding the accumulation of pollutants and the dynamics of the lower atmosphere. Lidar has been used for tracking the evolution of PBLH by using aerosol backscatter as a tracer, assuming aerosol is generally well-mixed in the PBL; however, the validity of this assumption actually varies with atmospheric stability. This is demonstrated here for stable boundary layers (SBL), neutral boundary layers (NBL), and convective boundary layers (CBL) using an 8-year dataset of micropulse lidar (MPL) and radiosonde (RS) measurements at the ARM Southern Great Plains, and MPL at the GSFC site. Due to weak thermal convection and complex aerosol stratification, traditional gradient and wavelet methods can have difficulty capturing the diurnal PBLH variations in the morning and forenoon, as well as under stable conditions generally. A new method is developed that combines lidar-measured aerosol backscatter with a stability dependent model of PBLH temporal variation (DTDS). The latter helps "recalibrate" the PBLH in the presence of a residual aerosol layer that does not change in harmony with PBL diurnal variation. The hybrid method offers significantly improved PBLH detection, with better correlation and smaller biases, under most thermodynamic conditions, especially for SBL and CBL. Relying on the physical process of PBL diurnal development, different schemes are developed for growing, maintenance, and decaying periods. Comprehensive evaluation of this new method shows much better tracking of diurnal PBLH variation and significantly smaller biases under various pollution levels.