• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.4
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• pp.64-70
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• 2007

This paper presents a study on the effects of feedrate and shotpeening on the fatigue life of A17075-T6 specimens. For this purpose, six groups of specimens, each of which consists of eight specimens, were first machined at six different feedrates(0.05, 0.10, 0.15, 0.20, 0.25, 0.30mm/rev). Half of eight specimens in each group were then peened and the others remained un-peened. Then, the fatigue life was measured by using 4-point rotatry bending machine. One observation was that the fast the feedrate was, the large the diameter of a specimen was. To make sure that the bending stress was the same in all cases, different loading conditions were thus applied to specimens based on their diameters. Next, comparison of fatigue life among twelve sets of specimens(six groups times two sets, peened and un-peened) was performed. Finally, based on machining cost analysis, a guideline for optimal feedrate was presented.

• The Plant Pathology Journal
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• v.32 no.4
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• pp.371-376
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• 2016

Grapevine Algerian latent virus (GALV) is a member of the genus Tombusvirus in the Tombusviridae and infects not only woody perennial grapevine plant but also herbaceous Nicotiana benthamiana plant. In this study, we developed GALV-based gene expression and virus-induced gene silencing (VIGS) vectors in N. benthamiana. The GALV coat protein deletion vector, pGMG, was applied to express the reporter gene, green fluorescence protein (GFP), but the expression of GFP was not detected due to the necrotic cell death on the infiltrated leaves. The p19 silencing suppressor of GALV was engineered to inactivate its expression and GFP was successfully expressed with unrelated silencing suppressor, HC-Pro, from soybean mosaic virus. The pGMG vector was used to knock down magnesium chelatase (ChlH) gene in N. benthamaina and the silencing phenotype was clearly observed on systemic leaves. Altogether, the GALV-derived vector is expected to be an attractive tool for useful gene expression and VIGS vectors in grapevine as well as N. benthamiana.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.12
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• pp.2340-2348
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• 1992

Recently, various film coated insert tools have been used in order to improve tool life by several different vapor deposition or chemical vapor deposition. Especially, TiN coated drills have been broadly studied because of improving drill performance in terms of drill life, work quality and its brilliant color. Nevertheless, because of the poor adhesion between TiN film and drill, it was difficult to attain the better drill performance. Therefore, to improve adhesion of TiN films, we sputtered titanium as interlayer prior to TiN deposition on drill by PECVD(Plasma Enhanced Chemical Vapor Deposition). The results indicate that Ti/TiN coated drills achieve about 2.6 times life improvement, while TiN coated drills only 2 times. Wear characteristics of tested drills were examined using SEM, and the results were correlated with drill life and roughness of drilled holes.

• Korean journal of food and cookery science
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• v.29 no.2
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• pp.161-168
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• 2013

The purpose of this study was to develop an educational app that informs parents of elementary students with correct information on pesticide residue based on their awareness and information needs on pesticide residue. A survey was conducted from 918 parents living in 8 different districts of Korea. The results of the survey indicated that a majority of parents felt uncomfortable with pesticide residue and wanted to have the proper information regarding it. Based on the above results, an app named 'Perfect Conquest of Pesticide Residue' consisting of 5 main menus of 'Pesticide residue, Is it safe?', 'Safe management of pesticide residue', 'Perfect removal of pesticide residue on fruits and vegetables through washing', 'Shopping without anxiety', 'Playground' and their own sub-menus was developed. When the app was applied to 30 parents using smart phones, a majority of them were satisfied with the contents of detailed information and fun activities. Therefore, this app could be utilized as an effective educational tool for the parents of elementary students by allowing them to have proper awareness on pesticide residue. Furthermore, more apps could be developed on other food risk factors to promote safe dietary life.

• Speech Sciences
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• v.14 no.3
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• pp.111-125
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• 2007

It is important to examine patients' subjective evaluation as well as objective measures and clinician's rating to assess voice disorders. This study aimed to evaluate validity and reliability of Korean-version of Voice Handicap Index (KVHI) and Voice-Related Quality of Life (KVQOL) with 113 adults with voice disorders and 111 normal adults. Content validity was verified by three experienced speech-language pathologists. Concurrent validity was revealed by examining the correlation among KVHI, KVQOL, and Voice Rating Scale as well as item discrimination coefficients. Total scores of KVHI and KVQOL of adults with voice disorders were significantly different from those of normal adults. Test-retest reliability and internal consistencies were significantly high in both KVHI and KVQOL. Correlations among scores of each subscale and total score were also significantly high in each tool. The study revealed that KVHI and KVQOL are suitable tools to be used in clinics and research areas in Korea, which can subjectively evaluate the effects of voice disorders on daily life as well as on quality of life.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.17 no.5
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• pp.58-63
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• 2008

Cold rolled and high strength steel were used for vehicle bodys to satisfy environmental regulation and improve fuel ratio. This paper presented a method far determining the fatigue life of cold rolled steel sheet EZNCEN and high strength steel sheet HS40R spot weldment used in vehicles. We can estimate the fatigue life of the spot weldments from the MSC/FATIGUE using the finite element method. The maximum load is found in the nugget part of both surfaces. The cold rolled steel and the high strength steel showed the maximum stress 746MPa and 730MPa in the effective nugget part when the weld current was 8KA and 7KA, respectively. Also the some weld current of the cold rolled steel and high strength steel is applied, the fatigue life of high strength steel is obtained about four times longer than the cold rolled steel.

• Journal of fish pathology
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• v.37 no.1
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• pp.89-96
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• 2024

Kudoa septempunctata, a myxozoan parasite, usually presents without any signs and primarily infects adult fish. The invasive diagnostic methods, such as tissue biopsy, can identify pathogens, but cause economic losses because they require killing the fish. In this study, we conducted a monitoring of four fish farms located on Jeju Island, to investigate the potential for non-invasive diagnosis of K. septempunctata using hyperspectral cameras. It provides spectral information from R000_B000_G000 to R255_B255_G255 for a total of 3,282 olive flounder (Paralichthys olivaceus). Each object is imaged with 2,000 data points, allowing comprehensive spectral analysis by comparing images obtained from negative control objects to positive control objects. Noticeable differences were observed in the brightness or pallor of the positive control images. This suggests the potential utility of hyperspectral imaging as a non-invasive diagnostic tool for detecting K. septempunctata infections in fish populations.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.1
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• pp.31-37
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• 2008

In this paper, we propose an entropy-based routing protocol to effectively support both stable route construction and route lifetime in Mobile Ad-hoc Wireless Sensor Networks (MAWSN). The basic idea and feature of the proposed routing protocol are as follows. First, we construct the stable routing routes based on entropy concept using mobility of mobile nodes. Second, we consider a realistic approach, in the points of view of the MAWSN, based on mobile sensor nodes as well as fixed sensor nodes in sensor fields while the conventional research for sensor networks focus on mainly fixed sensor nodes. The performance evaluation of the proposed routing protocol is performed via simulation using OPNET(Optimized Network Engineering Tool) and analysis. The results of the performance evaluation show that the proposed routing protocol can efficiently support both the construction of stable route and route lifetime in mobile ad-hoc wireless networks.

• Journal of Korean Medical Ki-Gong Academy
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• v.8 no.1
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• pp.115-127
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• 2005

The present study aims to provide efficient regimen by means of the Oriental medicine tool to measure Yangseng developed to fit the situation of Korea. For this purpose, the elderly people aged older than 65 were selected and their level of Yangseng was compared and analyzed depending on their perception of health. From the study, following conclusions could be drawn: 1. The total subject of study were 763 consisting mostly of the illiterate and spoused with disease but without leisure activities. 2. Most of the subjects were found to have little confidence with their health. With regard to their level of Yangseng, higher points were rated in morality yangseng, followed by activities & rest, diet, mind yangseng, sleep, seasonal yangseng, exercise and sex life in order. 3. By socio-demographic characters for the group with confidence in health, there were more male than female, with spouse, disease and leisure activities currently. In the group without confidence in health, there were more female, without spouse and leisure activity but with disease presently. 4. As for the level of Yangseng in the group with confidence in health, higher points were recorded in morality yangseng, followed by activities & rest, mind yangseng, diet, sleep, exercise and sex life in order. In case of the group without confidence in health, higher points were recorded in morality yangseng, followed by activities & rest, diet, mind yangseng, sleep, exercise and sex life in order. From the above outcomes, it would be necessary to motivate the subjects to have a renewed concept for health and efficient regimen. Continued and repeated eforts should be made to fill the gap in the study using the tool to measure Yangseng of the elderly people.

• Journal of The Korean Society of Integrative Medicine
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• v.9 no.3
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• pp.175-183
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• 2021

Purpose : Few studies have examined the relationship between elderly falls and quality of life (QOL) in a large general population. Furthermore, although many studies have investigated the relationships between socio-demographic factors and falls, relatively few studies have evaluated the associations of places and environments with QOL of fall. The purpose of the scheme was to identify the relationship between falls and QOL in a large sample of the elderly. Methods : This study used raw data from the 2013 Korean community health survey. A total of 228,781 people participated in the 2013 study among them 61.552 people were aged 65 or older. Authors also excluded 40 people whose QOL confirmation was unclear. Therefore, final analysis was conducted 61,512 senior citizens. The survey contained questions about the occurrence of falls, number of falls occurring per year, location of occurrence, and cause of falls. QOL was measured using the EQ-5D, an evaluation tool developed by the EuroQol group. Results : The results showed a statistically significantly lower QOL to little fear and full of fear as compared with no fear of falls (p<.05). The number of falls was statistically significantly lower in one, two, and three or more times, than in zero (i.e. no falls)(p<.05). In the falling environments, fall experience, but not related to lighting (p>.05), had a significant lower in QOL compared without the experience (p<.05). Conclusion : This study concluded that there is a strong connection between fall and QOL to the elderly, particularly regarding the number of occurrences, place, and environment. However, we found that an environment (e.g. the lack of lighting) might not affect QOL. It means that when the experts who make an effective tool or intervention may not need to consider indoor and outdoor darkness.