Seok-Kap Ko

Seok-Kap Ko
Electronics and Telecommunications Research Institute | ETRI · Honam Research Center

PhD

About

14
Publications
506
Reads
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34
Citations
Citations since 2017
6 Research Items
18 Citations
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20172018201920202021202220230123456

Publications

Publications (14)
Article
Human activity recognition (HAR) based on ambient sensors aims to recognize a conducted activity. A large number of deep learning models (DLMs) for HAR have been proposed. In contrast, human activity prediction (HAP) aims to early predict an activity. Compared to HAR, the advantage of HAP is to prevent a person from being exposed to unexpected case...
Article
Full-text available
We propose a novel data-driven feature extraction approach based on direct causality and fuzzy temporal windows (FTWs) to improve the precision of human activity recognition and mitigate the problems of easily-confused activities and unlabeled data, which significantly degrade classification performance owing to the correlation of labeled data. In...
Article
Full-text available
In this study, the authors are interested in estimating how much a PV system underperforms than expected byexploiting forecast uncertainty. For this, they first study a forecast accuracy-related forecast uncertainty metric using theensemble method based on the dropout technique, which is widely used in deep learning forecasting models. Given the fo...
Conference Paper
Full-text available
In this paper, we propose a method to optimize ESS operation based the result of the interval prediction for energy generation and consumption. The optimal operation scheduling is performed through linear programming using some of percentile estimates of energy generation and consumption predictions, the respective costs are calculated, expected va...
Article
In this paper, we propose a hybrid sensor calibration scheme for mobile crowdsensing applications. As the number of newly produced mobile devices containing embedded sensors continues to rise, the potential to use mobile devices as a sensor data source increases. However, because mobile device sensors are generally of a lower performance and cost t...
Article
Full-text available
Existing forwarding strategies for delay tolerant networks aim at network throughput maximization. They provide forwarding op-portunities to more reachable destinations. This results in the long end-to-end delay and low throughput of less reachable destinations. In this paper, we propose two forwarding strategies to improve the throughput of less r...
Conference Paper
Object movement detection is key component of remote surveillance and monitoring system. In this paper, we designs a reliable moving object detection system for video surveillance which works well in a Ubiquitous Sensor Networks (USN) environment. Our system has been implemented using Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE) sta...
Conference Paper
We propose the routing algorithm which improves nonstandard parts in ProPhet while keeping its interoperability with the standard. Key idea is that contact duration is reflected for delivery predictability (DP) calculation, and bundle forwarding decision and sorting algorithm are optimized based on how many times each bundle is forwarded. Through t...
Conference Paper
This paper proposes a method of improving the efficiency of P2P(peer-to-peer) content sharing services like BitTorrent using the network information in the mobile ad hoc network (MANET) environment. While many papers focus on P2P information dissemination and searching in the MANET environment, this paper focuses on the P2P data delivery strategy....
Conference Paper
In this paper, we propose a novel QoS control mechanism called IPFIX (class fixing in IP option header) which is intended to identify IMS user residing in conventional Internet for resources reservation in DiffServ core network. The work was motivated by the need of interoperability between QoS-enabled UMTS network and conventional Internet unable...

Questions

Question (1)
Question
Refer to the attached figure please. I expected the waveform of UWB to look like figure (a) in time domain, and the manual of my UWB transmitter set says also that it makes a UWB pulse looks like figure (a). It is a single pulse or impulse, I expected.
However, when I measure the waveform using a loop line between tx and rx, the waveform looks like figure(b). It has many swings and trailers. Why isn't it symmetric?

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Projects

Project (1)