Time filter

Source Type

Pohang, South Korea

Youngdong University is a private university located in Yeongdong-eup, Yeongdong County, North Chungcheong province, South Korea. It employs around 65 full-time instructors. Although traditionally focused on engineering, the university now offers degree programs in a range of fields including English as an international language, leisure studies, and special education. Wikipedia.

Yoo J.-H.,Youngdong University
Journal of Hydrologic Engineering | Year: 2012

In engineering hydrology, a lumped rainfall-runoff model applied to a watershed often requires a calculation of the effective rainfall, which deducts the precipitation losses from the total rainfall contributing to the direct runoff. In the model, these loss elements vary individually with time during a rain storm on a watershed. An estimation of the loss elements or abstractions, such as infiltration, depression storage, evapotranspiration, and interception, for the calculation of the effective rainfall in a watershed presents a practical challenge. Previous research has estimated infiltration and other loss elements in a watershed individually in the case of a storm event. Moreover, to date, these other loss elements have been treated as minor. However, this study proposes a simple model that estimates precipitation losses not individually but by combining the loss components together. A composite loss rate model that combines four loss rates over time is derived as a lumped form of a continuous time function for a storm event. The loss rate model developed is an exponential model similar to Horton's infiltration model, but its parameters have different meanings. In this model, the initial loss rate is related to antecedent precipitation amounts before a storm event, and the decay factor of the loss rate is a composite decay of four losses. As a case study, a method for estimating the parameters of this model is presented. In the case study, data sets from 10 rain storms observed at the Jeonjeokbigyo stage station in the experimental watershed of Selma-Cheon near Seoul in South Korea are used. © 2012 American Society of Civil Engineers.

Shin Y.-D.,Youngdong University
International Journal of Security and its Applications | Year: 2016

In this paper, we proposed a new fast detection method of copy-move forgery image using two step search algorithm in the spatial domain. We proposed a new two step search algorithm for copy-moved forgery image detection. The performance of the proposed method is experimented on several forged images. Our two step search algorithm reduced 96.82% computational complexity more than conventional algorithms for copy-move forgery image detection. The block distortion measure (BDM) of the two step search algorithm is sufficient by 2 pixels checking points instead of 64 pixels checking points for exhaustive search in the not copy-moved forgery image regions. Most blocks of the images constitute not copy-moved forgery images. Therefore, we can reduce computational complexity more than conventional methods. We didn't use any exhaustive search method and frequency domain (ex. DCT, Wavelet Transform) to reduce computational complexity in this paper. © 2016 SERSC.

Lee H.-J.,Youngdong University
Communications in Computer and Information Science | Year: 2012

It is rather obvious that prosody and text play crucial roles in successful emotional speech synthesis systems. However, the effects of prosody structure and word semantics are still studied independently despite their combined importance. In this paper, we propose an interactive fairy tale storytelling system that can express emotions too. For this system, we classify emotions into prosody-sensitive emotions and word-semantics-sensitive emotions, following the characteristics of individual emotions as analyzed from several experiments. As a result, we have found that joy is predominantly a word-semantics-sensitive emotion, which is why it is very hard to express the emotion with a prosody structure alone. © 2012 Springer-Verlag.

Shin Y.-D.,Youngdong University
Journal of Next Generation Information Technology | Year: 2014

We proposed forgery image detection method of scale up and down image using discrete cosine transform (DCT). The proposed method analyzed scale up and down forgery images based on frequency distribution of DCT coefficients. We just used discrete cosine transform without expectation maximization (EM) algorithm, probability map, and discrete Fourier transform. We ascertained the forgery image detection in the scale up and down image region. The image regions of scale up and down were found by DCT coefficients distribution in the frequency domain.

Shin Y.-D.,Youngdong University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

In this paper, we proposed a fast detection method of copy-move forgery image using three step search algorithm in the spatial domain. We proposed a new block distortion measure, matching criterion of copy-moved forgery image detection. Our algorithm reduced computational complexity more than conventional frequency domain algorithms and exhaustive search algorithm. We didn't use any exhaustive search method and frequency domain to reduce compute complexity in this paper. © 2012 Springer-Verlag.

Discover hidden collaborations