• Journal of information and communication convergence engineering
• /
• v.21 no.3
• /
• pp.233-238
• /
• 2023

This study presents a method for identifying partial discharge defects in an eco-friendly gas insulated system using a backpropagation algorithm. Four partial discharge (PD) electrode systems, namely, a free-moving particle, protrusion on the conductor, protrusion on the enclosure, and voids, were designed to simulate PD defects that can occur during the operation of eco-friendly gas-insulated switchgear. The PD signals were measured using an ultrahigh-frequency sensor as a nonconventional method based on IEC 62478. To identify the types of PD defects, the PD parameters of single PD pulses in the time and frequency domains and the phase-resolved partial discharge patterns were extracted, and a back-propagation algorithm in the artificial neural network was designed using a virtual instrument based on LabVIEW. The backpropagation algorithm proposed in this paper has an accuracy rate of over 90% for identifying the types of PD defects, and the result is expected to be used as a reference database for asset management and maintenance work for eco-friendly gas-insulated power equipment.

• International Journal of Computer Science & Network Security
• /
• v.24 no.8
• /
• pp.169-173
• /
• 2024

Nowadays high security is an important issue for most of the secure places and recent advances increase the needs of high-security systems. Therefore, needs to high security for controlling and permitting the allowable people to enter the high secure places, increases and extends the use of conventional recognition methods. Therefore, a novel identification method using retinal images is proposed in this paper. For this purpose, new mathematical functions are applied on corners and bifurcations. To evaluate the proposed method we use 40 retinal images from the DRIVE database, 20 normal retinal image from STARE database and 140 normal retinal images from local collected database and the accuracy rate is 99.34 percent.

• Journal of information and communication convergence engineering
• /
• v.22 no.3
• /
• pp.231-236
• /
• 2024

This paper presents a method used to identify partial discharge defects in cast-resin power transformers using a back-propagation algorithm. The Rogowski-type partial discharge (PD) sensor was designed with a planar and thin structure based on a printed circuit board to detect PD signals. PD electrode systems, such as metal protrusions, particle-on-insulators, delamination, and void defects, were fabricated to simulate the PD defects that occur in service. PD characteristics, such as rising time, falling time, pulse width, skewness, and kurtosis without phase-resolved partial discharge patterns, were extracted to intuitively analyze each PD pulse according to the type of PD defect. A backpropagation algorithm was designed to identify PD defects using a virtual instrument (VI) based on the LabVIEW program. The results show that the accuracy rate of back-propagation (BP) algorithm reaches over 92.75% in identifying four types of PD defects.

• Asian Pacific Journal of Cancer Prevention
• /
• v.15 no.24
• /
• pp.10565-10571
• /
• 2015

Gastric cancer incidence rates vary dramatically by world region with East Asia having the highest rate. The Asian population of the United States (US) is growing rapidly and over 17 million Americans are of Asian descent. A majority of Chinese, Korean and Vietnamese Americans are immigrants. Americans of East and Southeast Asian descent experience marked gastric cancer disparities and the incidence rate among Korean men in the US is over five times higher than the incidence rate among non-Hispanic white men. Randomized controlled trials have provided evidence for the effectiveness of helicobacter pylori identification and eradication in preventing gastric cancer. Additionally, Japan and South Korea have both experienced improvements in gastric cancer mortality following the implementation of programs to detect early stage gastric cancers. There are currently no clear US guidelines regarding the primary and secondary prevention of gastric cancer in high-risk immigrant populations. However, it is likely that a proportion of US physicians are already recommending gastric cancer screening for Asian patients and some Asian immigrants to the US may be completing screening for gastric cancer in their native countries. Surveys of US primary care physicians and Asian American communities should be conducted to assess current provider practices and patient uptake with respect to gastric cancer prevention and control. In the absence of clinical guidelines, US health care providers who serve high-risk Asian groups could consider a shared decision-making approach to helicobacter pylori identification and eradication, as well as gastric endoscopy.

• Parasites, Hosts and Diseases
• /
• v.21 no.1
• /
• pp.102-104
• /
• 1983

A total of 2,026 leprosy patients of the National Sorokdo Hospital was examined their infestparasites by cellophane thick smear method in January, 1983. The egg positive cases of Taenia spp. were treated with bithionol and the segments of Taenia were collected for species identification. The results were as follows: 1. Total egg Positive rate of any kind helminth was 78.2% and cumulative total was 85.2%. The egg positive rate for each helminth was as follow; Taenia spp. 3.4%, Ascaris lumbricoides 4.5%, Trichuris trichiura 72.1%, Clonorchis sinensis 2.8% and other 0.05%. 2. A total of 66 Taenia eggpPositive cases was treated; out of them proglottids of Taenia were collected from 26 cases. All of the collected worms were identified as T. saginata. The results revealed signiBicantly high egg positive rate of T. trichiura. However, A. lumbricoides was found to be controlled considerably by repeated chemotherapy during past 3 years. If chromotherapeutic agent is replaced with oxantel-pyrantel tablet, better result is expected. No clue was found for prevalence of T. sodium from both human and the pig in the island.

• Journal of Communications and Networks
• /
• v.5 no.4
• /
• pp.319-327
• /
• 2003

We consider the problem of low-sampling rate high-resolution channel estimation and timing for digital ultrawideband (UWB) receivers. We extend some of our recent results in sampling of certain classes of parametric non-bandlimited signals and develop a frequency domain method for channel estimation and synchronization in ultra-wideband systems, which uses sub-Nyquist uniform sampling and well-studied computational procedures. In particular, the proposed method can be used for identification of more realistic channel models, where different propagation paths undergo different frequency-selective fading. Moreover, we show that it is possible to obtain high-resolution estimates of all relevant channel parameters by sampling a received signal below the traditional Nyquist rate. Our approach leads to faster acquisition compared to current digital solutions, allows for slower A/D converters, and potentially reduces power consumption of digital UWB receivers significantly.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.9 no.5
• /
• pp.261-268
• /
• 2014

Face detection is essential to the full automation of face image processing application system such as face recognition, facial expression recognition, age estimation and gender identification. It is found that local image features which includes Haar-like, LBP, and MCT and the Adaboost algorithm for classifier combination are very effective for real time face detection. In this paper, we present a face detection method using local pixel direction code(PDC) feature and lookup table classifiers. The proposed PDC feature is much more effective to dectect the faces than the existing local binary structural features such as MCT and LBP. We found that our method's classification rate as well as detection rate under equal false positive rate are higher than conventional one.

• Korean Journal of Veterinary Service
• /
• v.23 no.1
• /
• pp.39-44
• /
• 2000

In order to monitor the parasites 426 fecal samples were taken from deer in Chonbuk area. The identification of the parasites was determined by the fecal examination using the floatation and microscopical examination, respectively. The results were summarized as follows; The detection rate of the parasites was 23.2%. Mixed infection rate was single 20.3% (87 heads), double 2.6% (11 heads), triple 0.2% (1 heads), respectively. The parasites isolates were identified as heamonchus spp from 40 heads, eimeria spp from 24 heads, trichoetrongyius spp from 13 heads, capiliaria spp from 9 heads, parapsitomum spp from 8 heads, strongyloides papillosus from 1 head, diotyocaiius fiiaria from 1 head.

• 제어로봇시스템학회:학술대회논문집
• /
• 1994.10a
• /
• pp.202-206
• /
• 1994

Mathematical model of the pollution rate of substation insulators is constructed, taking the model parameters as wind speed, wind direction, typhoon conditions and rainfall in an hourly basis. The main feature of model construction is to distinguish the effect of each parameter by separately analyzing the positive and negative pollution causing factors. Model parameters for the insulators of Karatsu substation, Saga, Japan were estimated and model validation was done using the actual data, in which the pollution deposits on the insulators were measured using pilot insulator and 'salt meter'. The proposed model of the pollution rate [mg/cm$^{2}$/hr] enables the identification of the effective parameters and prediction of the pollution rate so that it helps for the automatic decision making for insulator cleaning or the model can be used as a tool for the substation engineers to make precautionary measures.

• Korean Journal of Veterinary Service
• /
• v.27 no.2
• /
• pp.165-169
• /
• 2004

In order to monitor the parasites, 83 fecal samples were taken from monkeys such as Cercopithecus mitis(6), Macaca fuscata(32), Saimiri sciurea(27), Macaca nigra(5), Papio hamadrysa(8), and Macaca mulatta(5) in Jeonbuk area. Isolation and Identification of the parasites from the feces were determined by the fecal examination using the floatation and microscopical examination, respectively. The detection rate was 21.6%, and mixed infection rate was single 18.0%(15 heads), double 2.4%(2 heads), and triple 1.2% (1 head). The isolates were identified as Strongyloides axei from 7 heads. Trichuris spp from 3 heads, Entamoeba histolytica 3 heads, Toxacaris leonina from 3 heads, and Eimeria spp from 2 heads.