• Smart Structures and Systems
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• v.29 no.1
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• pp.29-39
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• 2022

Crack detection plays an important role in the maintenance and protection of steel box girder of bridges. However, since the cracks only occupy an extremely small region of the high-resolution images captured from actual conditions, the existing methods cannot deal with this kind of image effectively. To solve this problem, this paper proposed a novel three-stage method based on deep learning technology and morphology operations. The training set and test set used in this paper are composed of 360 images (4928 × 3264 pixels) in steel girder box. The first stage of the proposed model converted high-resolution images into sub-images by using patch-based method and located the region of cracks by CBAM ResNet-50 model. The Recall reaches 0.95 on the test set. The second stage of our method uses the Attention U-Net model to get the accurate geometric edges of cracks based on results in the first stage. The IoU of the segmentation model implemented in this stage attains 0.48. In the third stage of the model, we remove the wrong-predicted isolated points in the predicted results through dilate operation and outlier elimination algorithm. The IoU of test set ascends to 0.70 after this stage. Ablation experiments are conducted to optimize the parameters and further promote the accuracy of the proposed method. The result shows that: (1) the best patch size of sub-images is 1024 × 1024. (2) the CBAM ResNet-50 and the Attention U-Net achieved the best results in the first and the second stage, respectively. (3) Pre-training the model of the first two stages can improve the IoU by 2.9%. In general, our method is of great significance for crack detection.

• Journal of Nutrition and Health
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• v.36 no.4
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• pp.405-417
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• 2003

This study was to investigate practical methods for activity-based nutrition education for elementary school students, which help them understand the knowledge of food and nutrition and apply it to their day-to-day lives practically. The concept and necessity for activity-based nutrition education Were investigated and practical nutrition education methods based on activities were developed by referring to literatures related to activity based loaming and nutrition education methods. Activity-based nutrition education is a set of methods by which better food and nutrition habits are introduced by means of various activities, such as nutritional plays and games, story composing, nutritional songs, nutritional diaries, role plays, discussion and cooking. Elementary nutrition education should be based on various activities that take into consideration the children's intellectual and physical development because these students are in a concrete operational stage and they are naturally active, curious, and inquisitive. Thus, various activities were developed for elementary nutrition education, and educational effect and~ teaching methods are suggested. Children can be highly motivated and naturally absorb knowledge and desirable attitudes with respect to food and nutrition by means of these activities because they take into consideration the age and intellectual levels of the children.

• American Studies
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• v.44 no.2
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• pp.131-158
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• 2021

This paper examines how nation-specific history of Asian war brides affects different representations of war brides in Velina Hasu Houston's Tea (1984) and Julia Cho's The Architecture of Loss (2003). While war brides had long been excluded from American history, Japanese war brides were brought to public attention in the 1980s. Korean war brides, on the other hand, were kept out of sight until the 2000s. Focusing on how this time gap is related to ethnic difference, this paper analyzes dramaturgical differences between the two plays such as the presence/absence of war bride on stage or ethnic solidarity/familial reconciliation as the main device of war bride memorialization. Such differences, the paper suggests, stem from ethnic/historical differences between Korean and Japanese war brides. Through historical interpretations of the plays, this paper argues that America's military relationships with Korea and Japan were reproduced within the Asian-American families of each drama in ways that raise questions about pan-Asian identity.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.2
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• pp.521-525
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• 2012

Microsomal epoxide hydrolase (mEH) plays a significant role in the metabolism of numerous xenobiotics and is associated with several forms of cancer. Here, we investigated the role of mEH expression in bladder carcinogenesis, subsequent progression and recurrence. The expression of mEH was analyzed by Western blot in 50 bladder urothelial carcinoma and 20 normal epithelial tissues. There was a significantly higher mEH expression in the normal epithelium (P<0.05) and mEH expression was lower in high stage than in low stage tumors (P<0.05). Further, immunohistochmistry in 106 bladder urothelial carcinoma demonstrated mEH expression to be negatively correlated with histological grade, pT stage and recurrence (P<0.05). These findings suggest the important role of mEH in bladder carcinogenesis, cancer development and recurrence, providing support for efforts to develop mEH-based gene therapy.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.7
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• pp.343-351
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• 2003

In this paper, interleaved boost converter is applied as a first-stage converter in switch mode power supply. The first-stage converter plays a role to improve power factor. Interleaved Boost Power Factor Corrector(IBPFC) can reduce input current ripple as a single voltage control loop only without inner current loop, because input current is divided each 50% by two switching devices. Each converter cell is also operated in discontinuous current mode and inductor current of each converter is discontinuous. Total input current which is composed by each converter cell is continuous current. Thus, IBPFC is able to improve input current ripple. IBPFC operating in discontinuous current mode can be classified as six modes from switching state and be carried out state space averaging small signal modeling. A control transfer function is obtained according to the modeling. Not only steady-state characteristics but also dynamic characteristics is considered. Single voltage control loop is also constructed by the control transfer function. From experimental result, improvement of power factor and input current ripple are verified.

• Journal of the Korean Society of Costume
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• v.63 no.1
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• pp.42-55
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• 2013

As performing arts including operas are getting popular these days, the importance of stage costumes is strengthened. Stage costume is one of the artistic requisites for opera performance, it plays an important role in describing the play's situation, the director's style and the person's character. Nevertheless the study regarding the opera's costumes is not active, especially the comparative study on the same opera's costumes performed by different opera companies have hardly been made. Therefore this study compared 5 Manon Lescaut opera performances: the Metropolitan Opera(1980), the Flemish Opera(1991), the Metropolitan Opera(2008), the Seoul Metropolitan Opera(2010) and the Vienna State Opera(2010) and made clear the difference between the four. From this study, we can get the following conclusions. First, the Metropolitan Opera's costumes in 1980 act and in 2008 act ascertained Rococo dressing. Because the costume designer for both acts was the same person, the general costume styles of the two acts are similar. Second, as for the Flemish Opera and Seoul Metropolitan Opera, there was a significant drop in fancy details and trimmings in the costumes. But the costumes made strong impressions dues to its color and luminosity contrast. Third, Vienna State Opera costumes had the boldest designs and it reflected modern designs as well. This study is meaningful in that it is based on the comparison study on the same opera stage costumes designed by different directors. Afterward this study is expected to contribute toward study on opera stage costumes and stage costume's development.

• The Research Journal of the Costume Culture
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• v.13 no.6 s.59
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• pp.919-933
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• 2005

This study goes into the field of CosPlay that takes place in Korea, and directly observes the people who engage in CosPlays. Based on in-depth interviews, this research identified the reasons why the CosPlay aficionados participate in this practice and their cultural preferences. Ethnography methodology was used to understand the behavior of the cultural entities of CosPlays. Moreover, this research attempted to understand their daily formalities through their own perspective and language instead of superficial language. In general, CosPlay form that they manifest is classified into two main categories: those who enjoy posing by becoming their favorite characters and those like to wear the clothes of their favorite characters and go up on the stage to perform an act of animation or game where the applicable character appears. Some of these groups are: 1) 'Bishojo CosPlay' that CosPlays mostly Bishojo cartoon characters and wants to just stand out, 2) 'Aekyo' group that CosPlays merely for the sake of the enjoyment of wearing costumes instead of having the mania-like characteristics, 3) 'CosPlayer Group' who enjoy doing organized team CosPlay in order to present a performance, 4) 'J-Rock CosPlay' group that CosPlay Japanese visual rock groups and prepare to be among a professional CosPlay team, and 5) 'People related to Cospre.com' who try to make CosPlay rooted in as one of new cultures.

• Applied Microscopy
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• v.46 no.1
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• pp.58-66
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• 2016

Thymosin ${\beta}4$ ($T{\beta}4$) has been recently reported to play a role in dentinogenesis by regulating the expression of dentin matrix proteins. Based on previous studies, it is hypothesized that $T{\beta}4$ is associated with the formation of the enamel matrix and thus plays an important role in ameloblast. However, there is no report on the function of $T{\beta}4$ during tooth development so far. Therefore, in this study, we aimed to investigate the expression of $T{\beta}4$ and its function in ameloblasts during mouse tooth development. $T{\beta}4$ was expressed strongly in the tooth bud at the bud stage and in the dental lamina and oral epithelium at the cap stage. In advanced bell stage at postnatal day 4, large elongated ameloblasts were observed and the expression of the $T{\beta}4$ protein was the highest, with the enamel being was thicker than that in the early bell stage. The length of ameloblasts increased from the presecretory to the secretory stage and decreased from the maturation to the protective stage. These results suggest that $T{\beta}4$ participates not only in the proliferation of oral epithelial cells during the early stage of tooth development but also regulates enamel protein secretion in ameloblasts and enamel mineralization.

• The Journal of the Korea Contents Association
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• v.21 no.5
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• pp.949-960
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• 2021

Documentaries based on facts not only contain the spirit of that era but have been transformed in various ways according to changes in technologies and media. This study analyzed under the premise that the original documentary of YouTube plays a role in representing the characteristics of the medium. YouTube's original documentary is released on YouTube and then re-edited and released as a documentary film, and has the same shooting source, and is edited and described differently depending on whether it is a YouTube or a movie. This is the content that can confirm the media differences between YouTube documentary and documentary film. The cinema version shows the difference in that the narrative is developed using third-person narration and subtitles, mainly for handheld shooting and smooth editing, and the YouTube version is developing the narrative centering on audio-centric rough editing, interviews and background music. Through this, it can be seen that the YouTube version reinforces intimacy through a personal and direct expression method, while the cinema version reinforces objectivity through an official and indirect expression method.

• Proceedings of the PSK Conference
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• 2003.10a
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• pp.35-37
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• 2003

Efficacy and safety of drugs are evaluated in the process of drug registration along with the basis of setting test method and acceptance criteria for assuring quality of the drugs. Quality of drugs plays a key role to guarantee the efficacy and safety of drugs approved in the evaluation process at the marketing stage after approval. Most important role of pharmacopoeia is to give the basis of assuring the quality of drugs. (omitted)