• Journal of the Korean Applied Science and Technology
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• v.33 no.1
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• pp.30-40
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• 2016

This study related to get skin improvement effect of sheet mask pack using 5% of $2^{nd}$ fermented snail extract. To the scientific study of the skin, it was used for this sheet mask of 100% cotton as cutting face shape. We reported the results of measurement of skin improvement effect with the placebo and Gene-SEM (general snail extract mask). First; moisturizing effect of 2F-SEM ($2^{nd}$ fermented snail extract mask) has been increased about 11% than the PM and Gene-SEM was improved about 4.7% more than the PM (placebo mask). Second; elasticity of the mask pack containing $2^{nd}$ fermented snail extract was 13.8% better than PM and Gene-SEM was improved about 6.7 % more than PM. Third; Skin roughness of 2F-SEM has improved 6.80% than PM and Gene-SEM was improved about 2.3% more than PM. Fourth; melanin reductive effect of 2F-SEM was improved about15.0% more than PM and Gene-SEM was improved about 8.7% more than PM. Fifth; fine wrinkle decline effect of 2F-SEM was about 8.0% better than PM and Gene-SEM was improved with 5.1% more than PM. Sixth; sensorial evaluation of 2F-SEM using $2^{nd}$ fermented snail extract was significantly showed difference merits regarding softness, moisture, fine-wrinkle improvement.

• Smart Structures and Systems
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• v.29 no.1
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• pp.207-220
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• 2022

Structural health monitoring (SHM) plays a vital role in the maintenance and operation of constructions. In recent years, autonomous inspection has received considerable attention because conventional monitoring methods are inefficient and expensive to some extent. To develop autonomous inspection, a potential approach of crack identification is needed to locate defects. Therefore, this study exploits two deep learning-based segmentation models, DeepLabv3+ and Mask R-CNN, for crack segmentation because these two segmentation models can outperform other similar models on public datasets. Additionally, impacts of label quality on model performance are explored to obtain an empirical guideline on the preparation of image datasets. The influence of image cropping and label refining are also investigated, and different strategies are applied to the dataset, resulting in six alternated datasets. By conducting experiments with these datasets, the highest mean Intersection-over-Union (mIoU), 75%, is achieved by Mask R-CNN. The rise in the percentage of annotations by image cropping improves model performance while the label refining has opposite effects on the two models. As the label refining results in fewer error annotations of cracks, this modification enhances the performance of DeepLabv3+. Instead, the performance of Mask R-CNN decreases because fragmented annotations may mistake an instance as multiple instances. To sum up, both DeepLabv3+ and Mask R-CNN are capable of crack identification, and an empirical guideline on the data preparation is presented to strengthen identification successfulness via image cropping and label refining.

• Fashion & Textile Research Journal
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• v.17 no.4
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• pp.541-549
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• 2015

Korean traditional mask play was done at outdoor to let spectators join the play and take mask at performance and to have disadvantage of poor transfer of dialog to the spectators. Performers transferred dialog directly and/or indirectly by using visual costume, and Tongyeong Ogwangdae with many dialogue expressions concerning the costume made use of proper intention to help spectators understand. In this study, the author watched performance of Tongyeong Ogwangdae to collect and investigate not only image material but also photograph material and to classify intention of the costume into three: First, contents of the dialog were intended to make shape. The costumes of Hongbaek Yangban, Meoktal Yangban and Jorijung of the 2nd section gave spectators contents of the play, and the costume of Halmi Yangban of Nochangtal of the 4th section described dialog of Halmi. Second, dialog had connotative metaphor. The costume of Yeongno of Yeongnotal of the 3rd section symbolized an unfinished dragon, while that of Halmi of Nongchangtal of the 4th section did sacred of Halmi. And, Nongchagtal Ai's costume of the 4th section prayed for value of Ai, richness of the life and fecundity. Third, conflict between characters was intended by indirect media. The costume of Maltukee of metaphor mask of the 2nd section became base of the assertion supporting that Maltukee had better birth history than Yangban had, and the costume of Yeongnoyangban of Yeongnotal of the 3rd section produced conflict at disclosure of identity.

• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.243-248
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• 2019

This study was designed to prepare measures for future development and growth of local cosmetics industry by examining awareness, purchasing behaviors and satisfaction of beauty professionals with regard to Korean brand mask packs that have recently created a big trend in the beauty market. According to the results of survey, 80.6 percent of the respondents said that the most important factor in buying a mask pack was 'effect,' and as for the needed improvement of mask packs, 33.7 percent responded 'effect,' indicating that consumers still find the function of a product is unreliable. In addition, the respondents said that 'K-beauty effect' was the reason why mask packs were highly popular abroad, especially in China, and items that can promote beauty market were also said to be 'K-beauty advertising and promotion,' so it is believed that a good impression of K-culture rather than its own efficacy or reliability is leading to the present results. Therefore, K-beauty industry is expected to grow further in the global market if domestic and abroad consumers' confidence on the product is gained through the development of superior products that have improved effect and usability.

• The Korean Journal of Pain
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• v.34 no.2
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• pp.241-245
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• 2021

Background: It has been reported that a new type of headache may develop as a result of face mask use during the COVID-19 pandemic. The aim of this study is to investigate the clinical features of face mask-related headache during the COVID-19 pandemic. Methods: This is a cross-sectional study carried out on healthcare workers at the Afyonkarahisar Health Sciences University. The number of workers at our university was established. Sample size was calculated using the G*Power program. A questionnaire consisting of questions relating to pre-existing headache, an aggravation in headache, and de-novo headache was filled out by 3 neurologists with all participants. Results: Data was collected from a total of 375 participants, after the exclusion of 5 individuals who refused to participate. Out of all participants, 26 (6.9%) used a filtering mask, 274 (73.1%) used a surgical mask, 75 (20.0%) participants used a combination of both masks. The number of participants with preexisting headache was 114 (30.4%) had pre-existing headache. Of those with pre-existing headache, 77 (67.5%) healthcare workers had reported an aggravation in their headache after mask use. De-novo headache was observed in 116 (30.9%) of participants. De-novo headache characteristics included throbbing in 17 (14.7%) participants and pressing in 99 (85.3%) participants. In addition, symptoms such as tachypnea, sleep disturbance, and fatigue were found to be significantly higher. Conclusions: This study indicates that healthcare workers develop headaches due to use of masks during the COVID-19 outbreak.

• Fire Science and Engineering
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• v.29 no.4
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• pp.57-60
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• 2015

The removal efficiencies by elastic fire gas mask of toxic gases CO, HCl, HCN, and $SO_2$ produced by a fire have a key role in saving lives. The elastic fire gas mask comprises a visible window, elastic hood, gas purification canister, and air vent. It does not have hair or neck thongs, which makes it easy to use and put on quickly. This research examined the removal efficiency of toxic gases by such a mask. The removal efficiencies for CO with a background concentration of 2505.0 ppm were 99.99 and 99.98% after 3.5 and 8.5 min, respectively. The residual CO concentration was drastically increased after 8.5 min. The removal efficiencies for HCl, HCN, and $SO_2$ with background concentrations of 1003.0, 399.0, and 100.3 ppm, respectively, were 100% after 20 min.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.1
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• pp.9-18
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• 1987

An electro-optic system using linear photosensitive Charge Coupled Devices(CCDs) having dummy pixels has been proposed for realzation of linear prodictor in the differential pulse code modulation(DPCM). The system consists of three components as conventional system:input light source, spatial filter(mask) and CCD line scanning sensor. For the delay time due to the dummy pixels in CCD, modifying conventional mask, a new dispersive mask is proposed, of which every prediction coefficient is dispersed on the more than one element, the characteristics of the system using the proposed dispersive mask are analyzed theoretically and verified with experiment.

• Culinary science and hospitality research
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• v.8 no.3
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• pp.147-168
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• 2002

This research made an alternative plan about tour experience program development utilizable cooking peculiar of an Andong locality. First currently Andong region have an Andong bass fishing great meeting, an Andong international mask dance, an Andong apple expo, an Andong Korean beef miss choice meeting, an Andong Hahoe folk village dabbling in water festival, but Andong didn't have about food festival. This region will mask a planning about food festival after this. Second, an Andong have a rich tradition of confucianism and buddhism. For example, there are Bongieong temple and Dosan private school. Therefore it is necessary tour experience program development can join of food and culture. Third, in term original locality of mask dance, we can tour experience development program out of the traditional food festival and mask dance performance. Fourth, Andong have a traditional food (a bluff memorial service rice, Andong fermenting rice, Gunjin noodle) and a traditional Korean-style house(sueding, chirye artists). It is necessary the development of board and loading experience program.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.13 no.1
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• pp.55-62
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• 2004

This paper addresses the method for figuring out the hole diameter on the mask containing the information about machining depth. With this mask e micro machining is carried out with a simple 2D movement of the mask. Based on e suggested method excimer laser ablation processes are modeled and determination of the optimal laser ablation conditions such as hole diameter, step size, mask movement velocity, etc. is completed. The excimer laser ablation simulation for creating 3D micro lens is carried out by employing determined ablation conditions to prove verification of the method. The results from simulation illustrated the average error of 140nm and e relative error of 2％.

• International Journal of Precision Engineering and Manufacturing
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• v.7 no.4
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• pp.8-13
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• 2006

Nanoscale fabrication of silicon substrate in an aqueous solution based on the use of atomic force microscopy was demonstrated. A specially designed cantilever with a diamond tip, allowing the formation of a mask layer on the silicon substrate by a simple scratching process (Tribo-Nanolithography, TNL), has been applied instead of the conventional silicon cantilever for scanning. A slant nanostructure can be fabricated by a process in which a thin mask layer rapidly forms on the substrate at the diamond tip-sample junction along scanning path of the tip, and simultaneously, the area uncovered with the mask layer is etched. This study demonstrates how the TNL parameters can affect the formation of the mask layer and the shape of 3-D structure, hence introducing a new process of AFM-based nanolithography in aqueous solution.