• Journal of Korean Society of Disaster and Security
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• v.16 no.4
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• pp.129-136
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• 2023

A special offshore bridge with a high pylon has special structural features.Special offshore bridges have inspection blind spots that are difficult to visually inspect. To solve this problem, safety inspection methods using drones are being studied. In this study, image data of the pylon of a special offshore bridge was acquired using a drone. In addition, an artificial intelligence algorithm was developed to detect damage to the pylon surface. The AI algorithm utilized a deep learning network with different structures. The algorithm applied the stacking ensemble learning method to build a model that formed the ensemble and collect the results.

• Journal of Radiation Protection and Research
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• v.49 no.1
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• pp.29-39
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• 2024

Background: The gamma emission tomography (GET) device has been reported a reliable technique to inspect partial defects within spent nuclear fuel (SNF) of pin-by-pin level. However, the existing GET devices have low accuracy owing to the high attenuation and scatter probability for SNF inspection condition. The purpose of this study is to design and optimize a Yonsei single-photon emission computed tomography version 2 (YSECT.v.2) for fast inspection of SNF in water storage by acquisition of high-quality tomographic images. Materials and Methods: Using Geant4 (Geant4 Collaboration) and DETECT-2000 (Glenn F. Knoll et al.) Monte Carlo simulation, the geometrical structure of the proposed device was determined and its performance was evaluated for the ¹³⁷Cs source in water. In a Geant4-based assessment, proposed device was compared with the International Atomic Energy Agency (IAEA)-authenticated device for the quality of tomographic images obtained for 12 fuel sources in a 14 × 14 Westinghouse-type fuel assembly. Results and Discussion: According to the results, the length, slit width, and septal width of the collimator were determined to be 65, 2.1, and 1.5 mm, respectively, and the material and length of the trapezoidal-shaped scintillator were determined to be gadolinium aluminum gallium garnet and 45 mm, respectively. Based on the results of performance comparison between the YSECT.v.2 and IAEA's device, the proposed device showed 200 times higher performance in gamma-detection sensitivity and similar source discrimination probability. Conclusion: In this study, we optimally designed the GET device for improving the SNF inspection accuracy and evaluated its performance. Our results show that the YSECT.v.2 device could be employed for SNF inspection.

• The Journal of the Convergence on Culture Technology
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• v.10 no.2
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• pp.505-510
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• 2024

Since rolling contact fatigue cracks can always occur on the rail surface, which is the contact surface between wheels and rails, railway rails require thorough inspection and diagnosis to thoroughly inspect the condition of the cracks and prevent breakage. Recent detailed guidelines on the performance evaluation of track facilities present the requirements for methods and procedures for track performance evaluation. However, diagnosing and grading rail surface damage mainly relies on external inspection (visual inspection), which inevitably relies on qualitative evaluation based on the subjective judgment of the inspector. Therefore, in this study, we conducted a deep learning model study for rail surface defect detection using Fast R-CNN. After building a dataset of rail surface defect images, the model was tested. The performance evaluation results of the deep learning model showed that mAP was 94.9%. Because Fast R-CNN has a high crack detection effect, it is believed that using this model can efficiently identify rail surface defects.

• Journal of the Korea institute for structural maintenance and inspection
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• v.11 no.1
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• pp.121-129
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• 2007

The aim of this study is to investigate punching shear strength of exterior connections in the flat plate structure with rectangular column. To inspect the effect of column aspect ratios on the punching shear behavior, eight specimens for exterior connection were made and tested. In this experimental program the length of critical perimeter was kept constant, while column aspect ratio varied from 2.0 to 4.5. Two levels of concrete strength and slab reinforcement ratio were also considered. As the column aspect ratio increased, the punching shear strengths are decreased. The decrement of punching shear strength was small in specimens with high aspect ratio of column.

• The Journal of Advanced Prosthodontics
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• v.16 no.4
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• pp.201-211
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• 2024

PURPOSE. The aim of this prospective clinical study was to compare the influence of palatal vault forms on accuracy and speed of intraoral (IO) scans in completely edentulous cases. MATERIALS AND METHODS. Based on the palatal vault form, participants were divided into three equal groups (n = 10 each); Class I: moderate; Class II: deep; Class III: flat palatal vault. A reference model was created for each patient using polyvinylsiloxane impression material. The poured models were digitized using an extraoral scanner. The resultant data were imported as a solid CAD file into 3D analysis software (GOM Inspect 2018; Gom GmbH, Braunschweig, Germany) and aligned using the software's coordinate system to determine its X, Y, and Z axes. Five digital impressions (DIs) of maxilla were captured for each patient using an intraoral scanner (TRIOS; 3Shape A/S, Copenhagen, Denmark) and the resultant Standard Tessellation Language (STL) scan files served as test models. Trueness was evaluated by calculating arithmetic mean deviation (AMD) of the vault area between reference and test files while precision was evaluated by calculating AMD between captured scans to measure repeatability of scan acquisition. The scan time taken for each participant was also recorded. RESULTS. There was no significant difference in trueness and precision among the groups (P = .806 and .950, respectively). Average scan time for Class I and III palatal vaults was 1 min 13 seconds and 1 min 37 seconds, respectively, while class II deep palatal vaults showed the highest scan time of 5 mins. CONCLUSION. Palatal vault form in edentulous cases has an influence on scan time. However, it does not have a substantial impact on the accuracy of the acquired scans.

• The Journal of Korean society of community based occupational therapy
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• v.1 no.2
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• pp.1-9
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• 2011

Objective : Study purpose is to inspect not only the utility of Evaluation of Social Interaction(ESI) but also the efficiency of occupational therapy measurement in program based local community of solitary senior citizen in G region. Methods : Six solitary senior citizen in G region were participating in a community-based program were a convenience sample for this study. The Occupational Therapy Intervention Process Model (OTIPM) provided the theoretical framework. The ESI provided a pre-test performance measure and also served as a guide for an five-week occupational therapy intervention program, and as a post-test to measure intervention effectiveness. Results : This study showed that the ESI was effective in guiding therapist Intervention related to social skill performance of participants during their participation in a community-based program. As a group, the difference between pre and post ESI logit measures was also significant(t=-7.362, p=0.001). Conclusion : The study provides initial considerations for the utility of the ESI to guide intervention related to social skill performance during daily occupations in Korea. It further documents the effectiveness of the ESI in measuring occupational therapy intervention, based on OTIPM, and supports occupational therapy services provided in a community based program context for those solitary senior citizen.

• Korean journal of applied entomology
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• v.15 no.4 s.29
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• pp.199-204
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• 1976

Canna nosaic X bodies, which do not exist in tissues of the healthy plant and are originating in cells of virus infected Canna (Canna generalis BAILEY) with mosaic symptom, are easily observed under microscope through application of vital staining for 2-3 minutes with $1\%$ eosin of $H_2O$ solution added with slight amount of $CH_3COOH$ and distinguishing with N/5HCl followed by washing to inspect. The result of this experiment is summarized as following: 1) The X bodies are observed not only in epiermal cells of leaf of the mosaic virus infected Canna but in those of leaf sheath, stem, and root also, and it is expected that the X bodies are to exist in the flower cells of the disease infected Canna which were missed in this experiment. 2) Shape and nature of X bodies are not constant; in early stage of the disease development, the X bodies have equal contents and vague contour with their small size and round shape, but along with progress of the disease development they attain granular contents and clear contour with their increasing sige and defining shape in cytoplasm. In case of same individual pant, fully developed X. bodies. are increasing in cytoplasm in propoition to severity of mosaic and nettling of the diseased leaf. 3) The staining character of X bodies to eosin is more dense than that of nuclei; Xbodies are stained light red or red while nuclei are stained yellowish brown or light red. 1) It is assumed to be a result of cytoplasmic concentration around nucleus that X bodies are usunlly developed adjacent to nucleus and they are considered to be a cytoplasmic prodct. 5) Thus, I confirm that X bodies originsting in canna plant cells infected with mosaic virus aye multipling in the alive cells.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.9
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• pp.84-91
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• 2017

This study examined the routes, periods, and characteristics of Hamkyung-Gamsa's Sulryeok(巡歷) and his major duties during the Sulryeok. For this purpose, all hitherto known Hamkyung-Gamsa's official diaries, such as "Gwanbukilgi(關北日記)", "Sunryeokilrok(巡歷日錄)" and 'Buksunilgi(北巡日記)', 'Bukhaengilrok(北行日錄)' of "Dongbukansarok(東北按使錄)", were investigated closely. The main results of this study are as follows. 1) The Hamkyung-Gamsa's Sulryeok routes almost took the Gyeongheungro, which was one of the six main roads in the Joseon dynasty. The use of this road as the Sulryeok route was attributed to the rough terrain. 2) The Sulryeok routes were divided into two ways: the north and south routes centering on HamheungGamyoung. As Hamheung is located in the southern part of Hamgyeong-do, the northern Sulryeok route, which reached the downstream side of the Tuman River and border defense facilities, was long and took a long period of time. 3) Hamkyung-Gamsa's major duties during the northern Sulryeok route were to check the border defense facilities and hold literary and archery contests and special state examinations, especially in Gilju. His major duties during the southern Sulryeok route were to inspect and maintain the royal tombs and historical landmarks, such as Junwonjeon, Sukreung, Jireung. 4) Sometimes the routes of Hamkyung-Gamsa's Sulryeok included some sightseeing spots, which were famous for ten scenic spots of Bukgwan.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8800-8811
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• 2015

When the crucial role of the agent in communicating with the customer is acknowledged well enough to relieve the agent's stress, it will lead to the decrease of the agent's emotional labor and the improvement of the business organization's performance simultaneously. However, the research on the relationship between information system and the emotional labor has been scarcely conducted even though the importance of the emotional labor is actively researched and discussed these days. Therefore, much effort has been put in this study to fine out how the quality of airline call center information system affects expectations-conformation and how expectations-conformation and self-efficacy affect performance of Emotional Labors. Analysis of the results to target a call center agent 436 people, When you provide them with quality information systems, it increased satisfaction and pride in their job. This mechanisms subsequently reduces the strength of the emotion labor, which ultimately improves the service performance. The implications of this study can be summarized as following: First, this research presented practical guidelines to the organization's decision-makers related to the airline call center operations in order to introduce and expand successful call center information system. Second, this research suggested the possible method to inspect and diagnose the system by way of applying the measurement model mentioned in this research into the airline information system and analyzing it. Third, the performance-measuring model developed in order to measure the performance of the airline call center information system can also be used when we carry out the performance-measuring task in the similar information system as the basis of diagnosing the situation and presenting the driving directions.

• Journal of the Korean Institute of Landscape Architecture
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• v.20 no.1
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• pp.80-94
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• 1992

To inspect the changing of the forest soil and plants community structrure by air plooutand & acid rain during from September to November in 1990, the smapling sites were selected in the Piwon, Namsan and Kwangnung forest. In sites, plots were set up in Q. aliena forest at Piwon, Quercus mongolica and Pinus densiflora forest at Namsan and Q. mongolica and Pinus densiflora forest at Kwangnung. To obtain the individual number of trees, number of species, importance values and species diversity, using the Curtis & McIntosh methods. The results are following that; 1) In Pinus densiflora community, it was almost dominated by Q. spp. in the canopy layer and P. densiflora and Carpinus laxiflora through the subtree to shrub layer at Kwangnung. It wassaid that C. laxiflora is the climax species in moddle temperature zone. On the contrary, in Namsan forest, there is no appearance thesamplings of P. densiflora & C. laxiflora, but Styrax japonica and Stephanandra incisa that are acid-tolerance species are dominant ones. On the other hand, in Q. spp. community, Q. spp. and C. laxiflora are dominant ones. On the other hand, in Q. spp. community, Q. spp. and C. laxiflora are dominant species through all layer, and in addition C. cordata somewhat appear at Kwangnung. But at Namsan and Piwon forest, Q. mongolica & Q. aliena that were dominant species in canopy layer disappeared in the subtreeand shrub layer, and C. laxiflora and Corunus cordata absolutely disappeared. It were similarly dominated by Robinia pseudo-acacia, Styrax japonica, Sorbus alnifolia, Acer pseudo-sieboldianum, Rhododendrn mucronulatum and so on at Namsn and Piwon forest. In the light of these facts, it found out that disclimax was similar between Namsan and Piwon forest. 2) Species diversity and maximum species diversity were decreased in Kwangnumg, Namsan, Piwon in order. It was xpected that vegetational community was affected by environmental pollutant. 3) As the vegetational community structure analyses, using DCA technique among the ordination, ecological successional series are stopped to Q. spp. from P. densiflora at Namsan and Piwon, but that of Kwangnung is on the way that P. densiflora, Q. alena, C. laxiflora. It was obvi ously different from Namsan and Piwon. 4) In Q. spp. & P. densiflora community, the number of woody plants inNamsan & Piwon is much less than that of Kwangnung through all Layer. Especially, Piwon shown very severe difference. Through all community, the number of individuals of Piwon and Namsan are less than that of Kwangnung. Specially, that of the shrub layer is obvious. 5) In the growth rate of trees, it found out that all sites showed the growth decline phenomena. Especially, since in 1975, there have been the micro disclimax phenomena in Q. community of Kwangnung. 6) In the Q. community, soil acidity of Namsan & Piwon measured 4.57, 4.40 respectively. It was very strong acidity and far lower than that of Kwangnung. Also the content amount of Mg++ in Namsan & Piwon forest were still lower than Kwangnung.