이채영 교수

Here, we report an efficient inverted red indium phosphide (InP) comprising QD (InP/ZnSe/ZnS, core/shell structure) light-emitting diode (QLED) by modulating an interfacial contact between the electron transport layer and emissive InP-QDs and applying self-aging approach. The red InP-QLED with optimized interfacial contact exhibits a significant improvement in maximum external quantum efficiency and current efficiency from 4.42 to 10.2% and 4.70 to 10.8 cd/A, respectively, after 69 days of self-

Recently, porous ceramics have received much attention from researchers because of their excellent thermal and chemical stabilities compared to their counterparts (such as porous polymers and metals), despite their inferior mechanical instability. Among the various types of porous ceramics, reticulated porous ceramics have significant industrial potential because of their synergistic high porosity and permeability. However, to the best of our knowledge, there is insufficient data on the processi

The four articles in Part 1 of this Feature Topic examine IPTV systems, standards, and architectures. The articles are summarized here.

The five articles in this second part of this special issue focus on IPTV systems, standards and architectures. The articles are summarized here.

Several multicast protocols have been newly proposed to perform multicast in wireless ad hoc networks. Tree based multicasting is fragile and requires frequent control to maintain multicast tree. Mesh based multicasting is reliable but increases network load by flooding through mesh. We propose a hybrid structure of tree and mesh for multicasting in wireless ad hoc networks. We assume that the system can predict the connection holding time between each upstream and downstream node by using the l

We demonstrate a highly efficient red cadmium‐free quantum dot light‐emitting diode (QLED) comprising inverted structure and ZnO:Mg nanoparticles as an electron transport layer. Fabricated QLED reveals maximum external quantum efficiency of 4.46% and more than two‐fold increase in efficiency (10.17%) after aging for several days.

With the increase of Internet protocol (IP) packets the performance of routers became an important issue in internetworking. In this paper we examined the matching algorithm in gigabit router which has input queue with virtual output queueing. Port partitioning concept is employed to reduce the computational burden of the scheduler within a switch. The input and output ports are divided into two groups such that the matching algorithm is implemented within each input-output pair group in paralle

The personal communication service (PCS) is a system that aims to allow for communication anywhere in the world. PCS networks support mobile terminals (MTs) that are free to travel, and the network access point of an MT changes as it moves around the network coverage area. As a result, location management is important to effectively keep track of mobile terminals with reduced signal flows and database queries. Several methods have been suggested to improve the efficiency of location management s

This study examined the relationship between the amount of social media usage in adolescence and excessive reassurance seeking behavior and social comparison/feedback seeking behavior in early adulthood by those classified as Generation Z (those born between 1996 to 2010). Participants were classified according to when they first began using social media in order to make these comparisons. A total of 96 students, between the age of 19 to 25, completed self-report questionnaires on their social m

Location management is important to effectively keep track of mobile terminals with reduced signal flows and database queries. A system with single home location register and pointer forwarding is assumed. A mobile terminal is assumed to have memory to store the IDs of visitor location registers (VLRs) each of which has the forwarding pointer to identify its current location. To obtain the registration point which minimizes the database access and signaling cost from the current time to the time

The rapid growth in the demand for wireless multimedia services makes the provision of quality of service (QoS) an important issue. It is more important in an indoor environment. One of the key requirements of QoS is to reduce the dropping probability of handoff calls. It can be reduced by a proper call admission control (CAC) algorithm. In this paper, we propose a call admission control scheme that is adequate to an indoor environment to resolve the requirement of the dropping probability. Simu