Ex) Article Title, Author, Keywords
Abstract : An atomic force microscope (AFM) is a powerful analytical tool for many ﬁelds of science and engineering. Despite its usefulness, the actual instrument is highly technical and expensive, rendering it inaccessible to a majority of practitioners in science and engineering education. Growing curiosity of students through the hands-on learning method is appealing to education managers. Adoption of LEGO® or similar educational kits into a school environment can not only fascinate the interests of students for learning but also resolve the cost problems. Our conceptual AFM system constructed with LEGO® Education SPIKETM Prime kit is very much suitable for explaining the principles behind the workings of an AFM while promoting students interests in experimental aspects of scientiﬁc instrumentation.
Abstract : In this study, mode-locking condition analysis was conducted on an optical ﬁber laser with λ/4 plate, λ/2 plate, and polarizer sequentially installed inside for mode-locked pulse generation via the nonlinear polarization rotation eﬀect in the optical ﬁber. To examine the rotation angle conditions of wave plates where mode-locked pulses occur, an experiment was conducted to measure the polarization state of the beam at the optical ﬁber’s resonator end. The results were employed to acquire a transmittance map of the output coupler based on the rotation angles of the wave plates. The correlation between the measured mode-locking region and the obtained transmittance of the output coupler was analyzed based on the rotation angles of the wave plates. The ﬁndings revealed that the rotation angle region of the wave plates where mode-locked pulses occur can be easily observed on the transmittance map.
Abstract : Using a scaling analysis of statistical physics, this study quantitatively reveals the relationship between department and freshman densities by majors in Korean higher education institutions against the regional school-age population density. In particular, we deﬁne a scaling exponent that quantiﬁes differences in department and freshman densities in accordance with the differences in the regional school-age population density. We also discuss the regional differences in higher education with the temporal change of the exponent. The scaling exponents of junior colleges are higher than those of universities. Moreover, the scaling exponents of basic natural science, education, and medical–pharmaceutical majors are smaller than those of others. The exponents of freshman density increase over time in all disciplines, implying increasing regional differences in higher education. Finally, the ﬁndings can be extended to a more systematic study to plan the coexistence of balanced development with regional communities.
Abstract : In many complex systems, the dynamic processes that take place on a network and the changes in the network topology are intertwined. Here, we propose a model of coevolutionary dynamics of information spreading which is accompanied with link rewiring to facilitate the propagation of information. In our model, nodes possessing information attempt to contact new susceptible nodes through the link rewiring while the information spreads on a network. Using moment-closure and heterogeneous mean-ﬁeld approximations, we examine both the information spread dynamics and network evolution focusing on epidemic size, epidemic threshold, and degree distributions at the steady state. We found that more frequent heterophilic link rewiring leads to a larger epidemic size but does not alter the epidemic threshold. We also observed that link rewiring results in a broader degree distribution in the steady state. This study provides an insight into the the role of the heterophilic link rewiring in both facilitating information propagation and inducing network heterogeneity.
Abstract : The ﬁrst steam engine, the Aeolipile, was powered by action–reaction and rotational forces. This study presented the Aeolipile model experiments ‘Spinning water bottle’ and ‘Spinning straw’ to gifted science students and instructed them to generate corresponding explanatory models. Results showed that the gifted students most commonly provided explanatory models that explain the spinning phenomenon based on the concept of action–reaction. Additionally, the most common groups included students who either maintained a level 3 model that correctly explained the rotational phenomenon based on the law of action and reaction or progressed to a level 4 model that discusses the rotational phenomenon based on the law of action and reaction and rotational force. This ﬁnding conﬁrms that science-gifted students can generate explanatory models for the Aeolipile model based on their comprehension of the law of action and reaction. Moreover, the generation of explanatory models for the ‘Spinning straw’ experiment can aid science-gifted students in comprehending and expressing rotational forces.
Aekyung Shin, Donggeul Hyun, Jeongwoo Park
New Phys.: Sae Mulli 2023; 73(1): 37-43
Chang Won AHN, Jin San CHOI, Muhammad SHEERAZ, Hwan Min KIM, Ill Won KIM, Tae Heon KIM*
New Phys.: Sae Mulli 2021; 71(12): 991-1003
Sangwoo HA, Hyojun SEOK*
New Phys.: Sae Mulli 2021; 71(12): 1044-1057