• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.224-227
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• 2022

객체 분류는 입력으로 주어진 이미지에 포함된 객체의 종류를 판단하는 기술이다. 대표적인 딥러닝 기반의 객체 분류 방법으로서 Faster R-CNN[2], YOLO[3] 등의 모델이 개발되었으나, 여전히 성능 향상의 여지가 있다. 본 연구에서는 각도 마진 손실 함수를 기존의 몇 가지 객채 분류 모델에 적용하여 성능 향상을 유도한다. 각도 마진 손실 함수는 얼굴 인식 모델인 SphereFace [4]에서 제안한 방법으로, 얼굴 인식과 같이 단일 도메인의 데이터셋을 분류하는 문제를 풀기 위해 제안되었다. 이는 기존 소프트맥스 함수에서 클래스 결정 경계선에 마진을 주는 방식으로 클래스 간의 구분 능력을 향상시킨다. 본 논문은 각도 마진 손실 함수를 CIFAR10, CIFAR100 데이터셋의 분류 문제에 적용하였으며 ResNet, EfficientNet, MobileNet 등의 백본 네트워크로 실험하여 평균적으로 mAP 성능이 향상되는 것을 확인하였다.

• Journal of Food Hygiene and Safety
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• v.39 no.1
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• pp.35-43
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• 2024

Numerous methods have been applied to assess the antibacterial effectiveness of hand hygiene products. However, the different results obtained through various evaluation methods have complicated our understanding of the real efficacy of the products. Few studies have compared test methods for assessing the efficacy of hand hygiene products. In particular, reports on ex vivo pig skin testing are limited. This study aimed to compare and characterize the methodologies applied for evaluating hand hygiene products, involving in vitro, ex vivo, and in vivo approaches, applicable to both leave-on sanitizers and wash-off products. Our further aim was to enhance the reliability of ex vivo test protocols by identifying influential factors. We performed an in vitro method (EN1276) and an in vivo test (EN1499 and ASTM2755) with at least 20 participants, against Serratia marcescens or Escherichia coli and Staphylococcus aureus. For the ex vivo experiment, we used pig skin squares prepared in the same way as those used in the in vivo test method and determined the optimal treated sample volumes for sanitizers and the amount of water required to wash off the product. The hand sanitizers showed at least a 5-log reduction in bacterial load in the in vitro test, while they showed little antibacterial activity in the in vivo and ex vivo tests, particularly those with a low alcohol content. For the hand wash products, the in vitro test was limited because of bubble formation or the high viscosity of the products and it showed low antibacterial activity of less than a 1-log reduction against E. coli. In contrast, significantly higher log reductions were observed in ex vivo and in vivo tests, consistently demonstrating these results across the two methods. Our findings revealed that the ex vivo and in vivo tests reflect the two different antibacterial mechanisms of leave-on and wash-off products. Our proposed optimized ex vivo test was more rapid and more precise than the in vitro test to evaluate antibacterial results.

• Science of Emotion and Sensibility
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• v.14 no.1
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• pp.1-6
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• 2011

A perceptual reaction to human being's gaits has "regularity" that possibly obtains sympathy among people. This thesis is in the vein of the study that performs the research on the quantificational extraction of the regularity, reconstitute the result, and apply it to controlling behavior. The purpose of this thesis lies in assuring the validity of the future research by demonstrating the following hypothesis: when the physical numerical values of the gait "A" whose perceptual reaction is "a" and those of the gait "B" whose perceptual reaction is "b" are arbitrarily blended, the perceptual reaction to this blended gait also corresponds to the blend of "a" and "b", "a/b". I blended the samples of two types of gaits in the form of Bipeds using the EAM made by 3D Studio Max Script. Blending outcomes were obtained successfully for four times out of the six tries in total. It implies that without utilizing other methods such as Motion Capturing, the basic Bipeds data itself has an enough capability to generate various gaits of Bipeds. Although the present research targets only the Bipeds samples equipped with the 1Cycle moving condition of arms and legs, I acknowledge that a tool that makes blending possible under various moving conditions is necessary for a completed system.

• Journal of the Mineralogical Society of Korea
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• v.18 no.3 s.45
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• pp.147-153
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• 2005

Naldrettite, recently discovered in the Mesamax Northwest deposit, Ungava region, northern Quebec, Canada, was reported as a new mineral. In order to confirm whether itis a natural equivalent of synthetic $Pd_2Sb$ phase or not, the pure $Pd_2Sb$ phase has been synthesized and investigated by reflected microscope, electron microprobe analyser, X-ray diffractometer, and micro-indentation hardness tester. Under reflected light synthetic $Pd_2Sb$ Phase is white with a creamy tint in both air and oil and weakly bireflectant. Anisotropism is strong, from brownish gray to greenish blue in air. Micro-indentation hardness test gives VHN100=293(242-322). Composition of the phase is $63.7\~64.3wt.\%\;Pd\;and\; 36.4\~36.8wt.\%$ Sb, and is entirely consistent. The phase, quenched from $500^{\circ}C$, is orthorhobic with space group $Cmc2_1$, and the cell parameters are a=3.366(1), b=17.523(3), c=6.929(2) ${\AA}$. All mineralogical properties of synthetic $Pd_2Sb$ compare very well with those of naldrettite, confirming that naldrettite is the natural analogue of the synthetic $Pd_2Sb$ phase.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.47 no.4
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• pp.305-316
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• 2021

This study relates to the development of a new gel sheet mask that finally does not require support based on the reactivity and acid/base reaction experiments of Tamarindus indica seed gum (TG), ethanol, and polyols. When TG and a specific alcohol was mixed at a certain mixing ratio, a transparent gel is formed by reaction with each component, and thus a gel sheet mask without support might be obtained using the mixture. In order to maximize skin tone improvement, a carbonation system of acid and base reactions was introduced, and skin brightness and moisturizing power were evaluated using a spectrophotometer and a moisture measuring device. Through this study, it is expected that the gelation reaction by hydrogen bonding of TG, ethanol, and polyols can be developed into various types, and the gel sheet mask formulation introduced in this study is expected to help develop new products in the future.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.48 no.2
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• pp.87-95
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• 2022

This study is about the development of transparent cleansing water with one of the beta-hydroxy acids (BHA), salicylic acid, and capryloyl salicylic acid, which is one of the lipo-hydroxy acids (LHA). Transparent appearance was stabilized by increasing the solubility of lipophilic salicylic acid and capryloyl salicylic acid in water using ethanol, polyol, and sodium hydroxide, and supplementing suspension and deposition using a double micelle structure of two types of PEG surfactants. Cleansing water applied with this technology was developed, and makeup removing ability and skin texture improvement ability were confirmed using an optical camera and an image analyzer. This solubilization technology is proposed as a new approach of LHA, which has been difficult to apply due to its low solubility in water, and is expected to help in the development of new chemical peeling products.

• The Journal of the Korea Contents Association
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• v.22 no.2
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• pp.782-793
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• 2022

The rise in chronic disease not only has a negative effect on people's lives, but it also increases the cost of medical care owing to the increased usage of medical care as health and medical technology improves, life expectancy rises, and rapid population ageing. In such context, this study examined the difference in the disease cost of hypertension according to demographic information and the effect of the initial diagnosis age and treatment period on the cost. This study used the Korean Health Panel Survey from 2010 to 2017, and selected subjects based on health insurance beneficiaries between the ages of 30 and under 80. With the selected data, the direct and indirect costs of disease loss were calculated according to the cost of illness approach, and we constructed a disease-loss ratio cohort considering the age of diagnosis and time of treatment for hypertension. From the results of the study, the annual cost of disease loss for hypertensive patients differed by gender by 110,107 won, and it was found that the cost increased by 1.8 times as the treatment time increased. In addition, when comparing disease loss ratios between the same age groups, it was found that the disease loss ratios between those in their 60s and 70s were affected by treatment time. This study confirmed that hypertension significantly affects the cost of the disease, and not only requires early diagnosis and management, but also preventive efforts to lower the incidence of hypertensive disease must be strengthened.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.49 no.2
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• pp.97-106
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• 2023

In this study, we would like to study the stabilization of the high content of ceramide formulation by containing cyclodextrin. Ceramide, which constitutes the intercellular lipid, a human skin barrier, is a very important ingredient in moisturizing maintenance by protecting moisture in the skin and strengthening the skin barrier. However, since ceramide is poorly soluble, even if it is included in the cosmetic formulation, it has a problem that it is slowly gelled or crystallized and deposited over time, making it difficult to containing a high amount of ceramide. Cyclodextrin is a cyclic oligosaccharide connected with glucose molecules and has a cylindrical structure with hydrophilic outer surface and hydrophobic inner surface, which is known to improve the physicochemical properties of drugs such as improving solubility and absorption of poorly soluble drugs. We demonstrated the stability of the formulation containing high amount of ceramide by measuring hardness and observing emulsion drops with polarized microscope. This study also demonstrated that the high-content ceramide formulation containing cyclodextrin has the effect of preventing gelation or crystallization of ceramide, thus having excellent environmental conditions stability and skin moisturization.

• The Journal of the Convergence on Culture Technology
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• v.3 no.4
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• pp.171-175
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• 2017

Recently, Training of the convolutional neural network (CNN) entails many iterative computations. Therefore, a method of accelerating the training speed through parallel processing using the hardware specifications of GPGPU is actively researched. In this paper, the operations of the feature extraction unit and the classification unit are divided into blocks and threads of GPGPU and processed in parallel. Convolution and Pooling operations of the feature extraction unit are processed in parallel at once without sequentially processing. As a result, proposed method improved the training time about 314%.

• 한국벤처창업학회:학술대회논문집
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• 2017.04a
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• pp.58-58
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• 2017

본 연구는 미래에 창업을 하고자하는 예비창업자에게 창업의도의 방향을 제시하기 위해 창업을 하기 전 자신을 알게 하고 정부지원과 교육의 필요성, 중요성을 일깨워주는 연구로 실증적으로 조사 규명하였다. 향후 예비창업자에게 창업준비를 충분히 하여 실패를 줄이고 정부지원제도의 지원체계가 복잡하지 않은 효율적인 제도가 되길 시사점으로 제시하였다. 실증 분석의 대상은 인천지역 직장으로 고용에 불안한 비정규직과 퇴직을 앞둔 남녀로 조사 258개 데이터로 사용 하였으며 창업을 하고 싶지만 자신감이 부족하고 실패에 대한 불안감으로 시작을 못하였다는 점으로 미루어보아 의미 있는 조사 분석이였다. 측정도구의 신뢰도 타당성을 검증하기 위하여 요인분석과 신뢰도 분석을 실시 카이저 (Kaiser Rule) 규칙이 있는 베리맥스(Varimax)직각회전을 이용한 주성분 요인분석을 사용하였다. 가설검증 결과 예비창업자의 심리적 특성, 창업준비 특성이 창업의도에 영향을 미치는 것으로 나타났으며 창업교육 조절효과 분석 결과는 창업준비 기간과 창업의도 간에 조절효과가 나타났다. 개인적 특성에 따른 창업의도는 창업준비 특성에서 차이가 보여 졌다. 본 연구는 예비창업자로서 창업의도에 창업자로서 특성을 갖추어 성공적인 창업을 준비하고 정부지원제도에 필요한 자료로 제시하고자 한다.