Search results for: Byungjun Lee
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Advanced Engineering Materials > 23 > 4 > n/a - n/a
Kirigami‐based structures and materials have recently emerged with a variety of geometric transformation capabilities in applications such as flexible electronics, soft robotics, nanophotonics, energy harvesting, and others. Herein, a 2D pattern of cuts (kirigami) that transform into a 3D, one‐piece compliant mechanism that allows for optical tracking over a solid angle sweep of over 110° in two...
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Microsystem Technologies > 2019 > 25 > 7 > 2547-2552
Skin rejuvenation is the most popular topic in cosmetic industry. Recently, skin phototherapy is spotlighted among a lot of skin therapies by its advantageous effects and ease of use. Phototherapy has been widely used for cosmeceutical purposes such as anti-aging or anti-bacterial effects. By the optical properties of light, however, the visible lights cannot reach deep inside the skin layer by reflection...
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Human-centric Computing and Information Sciences > 2018 > 8 > 1 > 1-25
With rapid growth of social networking service on Internet, huge amount of information are continuously generated in real time. As a result, sentiment analysis of online reviews and messages has become a popular research issue [1]. In this paper a novel modified Chi Square-based feature clustering and weighting scheme is proposed for the sentiment analysis of twitter message. Along with the part of...
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Edge computing is a novel computing paradigm in which the edge nodes of Internet of Things (IoT) are heavily involved in data processing. Resource Description Framework (RDF) plays an important role in Semantic Web due to the explosive growth of data of IoT. RDF is a graph-based data model employed for representing the Uniform Resource Identifiers (URIs), and SPARQL is the standard query language...
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The Journal of Supercomputing > 2018 > 74 > 1 > 141-159
As flash memory becomes popular, flash memory-based solid-state drive (SSD) has been the major storage device. SSD has numerous merits such as high I/O speed, low energy consumption, strong shock resistance and small form factor. Meanwhile, some shortcomings still exist including erase-before-write and different cost for read, write and erase operation. Aiming at efficient buffer management of SSD,...
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Correct and fast sentiment analysis of continuously generated data such as Twitter message is very important for providing real-time customized service to the users. While Naive Bayes Classifier(NBC) is the most popular classifier employed for sentiment analysis, the existing studies on it have been based on single server environment. Consequently, they are not adequate for handling real-time stream...
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Constrained Application Protocol (CoAP) was developed to support the communication between resource constrained nodes via low-power links. As an Internet protocol, CoAP needs congestion control primarily to stabilize the networking operation. In this paper we propose a new round trip time based adaptive congestion control scheme, which improves CoAP by utilizing the retransmission count information...
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With the advancement in IT including mass storage device and super-fast communication, cloud computing is now in high demand. At the same time, the explosive increase in the volume of diverse and extensive data has brought forth the age of big data organized as countless directories within a file system. The exponential increase in data volumes causes slow retrieval of metadata of the requested files...
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As the popularity of flash memory increases, solid state drive (SSD) based on flash memory is widely used in the enterprise computing environment, owing to its shock-resistance, non-volatile, low energy consumption, and high I/O speed. Meanwhile, SSD has the characteristics of not-in-place update and asymmetric I/O latency among read, write, and erase operation as write/erase operation are much slower...
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The Solid State Drive (SSD) is now becoming a main stream in storage systems. It is widely deployed as cache for hard disk drive (HDD) to speed up the execution of data intensive applications. In this paper we propose a novel block replacement algorithm for flash-based disk cache, named Block Replacement based on Popularity(BRP). Using the frequency and recency of block access, it calculates the block...
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Data exist in various persistent-storage formats, and Hadoop distributed file system (HDFS) has been recognized to be effective for distributed storage and processing. Recently, the research of Hybrid NAND flash-based solid state drives (SSD) is rapidly expanding into the storage areas including Hybrid ReRAM/MLC NAND SSD. Most existing researches of Hybrid SSD are based on a single storage, while...
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Resource allocation for virtual machines is a crucial issue in cloud computing. Many researchers have developed various solutions for effective resource allocation of data centers. The fuzzy decision making scheme has been recognized as an effective candidate for this problem. The solution, however, has a limitation that linguistic parameters are used as input in the selection of suitable VM and PM,...
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Nowadays, wireless sensor networks (WSNs) are widely used, and various routing schemes have been developed for them. Its lifetime is limited as each node of WSN is battery-powered, and unnecessary data transmissions of the nodes shorten the lifetime of entire network. Gossiping protocol has been recognized as one of the most effective routing schemes employed for WSN. In this paper we propose a new...
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With IPTV, channel zapping time is one of the significant problems. It occurs when the user wants to change the channel but needs to wait until the target channel is available. Various schemes reducing the time have been suggested, which download the candidate channels of the future use in advance. In this paper we propose a new method which further reduces the channel zapping time by pre-downloading...
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Handover is one of the key operations in the mobility management of long-term evolution (LTE)-based systems. Hard handover decided by handover margin and time to trigger (TTT) has been adopted in third Generation Partnership Project (3GPP) LTE with the purpose of reducing the complexity of network architecture. Various handover algorithms, however, have been proposed for 3GPP LTE to maximize the system...
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In pervasive computing environment the low-level context data provided by the sensors are usually meaningless, and thus higher-level context needs to be extracted. Situation is the semantic interpretation of low-level context, permitting a higher-level specification of human behavior in the scene and the corresponding system service. Context modeling and reasoning are the two key parts in the situation...
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Reduction of the number of association rules in data mining is a very important issue in the field of socially-aware computing in which big data need to be manipulated. The existing schemes based on the frequency of occurrences are not effective for relatively large size dataset. In this paper we propose the tabular-algorithm that assigns a weight to each rule for the removal of unimportant rules...
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The rapid advancement of mobile communication technologies recently has led to the advent of mobile IPTV service. For a variety of multimedia services, a process of session setup using SIP (session initiation protocol) is required. However, high frame error rate (FER) of typical wireless network causes failure and delay in session setup. In this paper we propose a new scheme minimizing the session...
