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VoiceID: 딥러닝 기반 음성인식을 통한 모바일 보안 솔루션
현진(Jin Hyun),류동헌(Dongheon Ryu),정강민(Kangmin Jeong),이영주(Youngjoo Lee) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
In this paper, we introduce a mobile security solution named VoiceID, which utilizes lightweight deep neural networks (DNNs) for speech signal processing. The proposed VoiceID uses a new frame-level speaker embedding from the existing DNN model, which can be trained with the softmax cross entropy. The fine-tuning training is newly added with the triplet loss function, enhancing the quality of user-level identification. The word-level identification is also realized to provide the access right for each user, empowered by using the Cosine distance between bedded voice vectors. Evaluation results show that our VoiceID system successfully restricts 99.93% of unregistered users with simple yet efficient DNN-based processing steps, which can be used for the lightweight security solutions.
Lee, Dongheon,Lee, Hyun Jung,Yoon, Ji Won,Ryu, Minkyung,Jo, Cheorun Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.10
Objective: This study aimed to elucidate the effects of cooking conditions on the physicochemical and sensory characteristics of dry- and wet-aged beef strip loins. Methods: Dry- and wet-aged beef aged for 28 days were cooked using different cooking methods (grilling or oven roasting)×cooking temperatures (150℃ or 230℃), and their pH, 2-thiobarbituric acid reactive substances (TBARS), volatile compounds, and color were measured. Results: Cooking conditions did not affect pH; however, grilling resulted in lower TBARS but higher cooking doneness at the dry-aged beef surface compared to oven roasting (p<0.05). In descriptive sensory analysis, the roasted flavor of dry-aged beef was significantly stronger when grill-cooked compared to oven roasting. Dry-aged beef grill-cooked at 150℃ presented a higher intensity of cheesy flavor, and that grilled at 230℃ showed a greater intensity of roasted flavor compared to wet-aged beef at the same condition, respectively. Conclusion: Grilling may be effective for enhancing the unique flavor in dry-aged beef.
이산선택모형을 이용한 주거용수용가의 전력서비스 전환비용 추정
이종수,이동헌,이정동,박유리 한국환경경제학회 한국자원경제학회 2004 자원·환경경제연구 Vol.13 No.2
전력산업은 필수재적인 성격과 막대한 초기시설투자의 필요 등으로 독점적 시장구조를 갖고 있는 것이 일반적이었다. 그러나 기술의 진보로 인해 전력산업과 같은 네트워크 산업에서의 규모의 경제로 인한 효과가 감소되면서 자연독점적 산업에서의 경쟁도입이 점차 확산되고 있는 것이 세계적인 추세이다. 우리나라에서도 현재 전력산업 구조개편이 추진되고 있지만 아직 소매시장에서의 경쟁 도입은 이루어지지 않은 상황이다. 소매경쟁은 구조개편의 성과를 확인할 수 있는 완성단계로서 소매시장에서의 경쟁이 효율적으로 일어나는 가의 문제는 구조개편을 추진하는 정책결정자의 입장에서 중요한 문제이나 이에 대한 정량적인 연구는 거의 없는 현실이다. 본 논문은 전력소매시장에서 경쟁의 유효성을 전환비용을 통해 정량적으로 분석하였다. 전환비용이 크면 시장에 경쟁이 도입되더라도 실질적으로 소비자가 기존 사업자에게 고착 될 가능성이 높으므로 전환비용의 크기를 정량적으로 측정하는 것은 향후 전력소매시장에 도입된 경쟁이 유의하게 작용할 것인가에 대해 정보를 제공할 수 있다. 이를 위해 본 논문에서는 컨조인트 분석을 통해 얻어진 가상적인 상황에서의 소비자의 전력상품에 대한 진술선호 자료를 바탕으로 전력소매시장에서의 전환비용을 정량적으로 추정하였다. 실증분석 결과, 전력상품의 특성상 절차상의 전환비용은 크지 않았으나 기존 공급업자에 대한 상대적인 브랜드 로열티가 크게 나타났으며, 전력상품의 선택시 소비자는 가격을 가장 중요한 요인으로 고려하고 있는 것으로 나타났다 이 결과는 영국 등의 해외 소매경쟁 자료와 유사한 것이며, 이를 통해 신규 진입기업의 경영효율성에 따른 가격경쟁력과 소비자의 전환가능성의 관계 파악이 가능하므로 개별기업이나 정책결정자에게 소매경쟁 진출 및 도입의 판단근거를 제시할 수 있을 것이다. Generally, electricity market has monopoly market structure because of need of enormous investment for infrastructure. However, the introduction of competition in network industry as electricity is a tendency of the world with decreasing the effects of economy of scale due to the advancement of technology. Now, electricity industry restructuring is in progress but the competition in electricity retail market is not in force yet in Korea. Whether a effective competition exist or not is very important to policy decision maker who drive restructuring, but there are small numbers of quantitative researches on that. In this study, we estimated the effectiveness of competition in the electricity retail market through switching costs. If switching costs are high, consumers actually can be locked in incumbent firm in spite of introduction of competition. Therefore switching is a critical factor to determine effectiveness of competition and to estimate the size of switching costs quantitatively can proffer the information about whether the competition in the electricity retail market is effective or not in the future. We estimated switching costs using consumer' stated-preference data by conjoint analysis. In according to estimation results, the cost of switching process is not so high, but the relative brand loyalty of an incumbent company is significantly high. And the price is considered as the most important factor choosing an electric service commodity. Based on the empirical results, it is possible to analyze the relationship between suppliers' competitiveness resulted from management efficiency and customers' switching possibilities. The paper therefore provides guidance for suppliers in deciding to enter into retail competition and for policy makers in introducing retail competition. And it has a significance of estimating the switching costs directly.
Preliminary study on application of augmented reality visualization in robotic thyroid surgery
Dongheon Lee,Hyoun-Joong Kong,Donguk Kim,Jin Wook Yi,Young Jun Chai,Kyu Eun Lee,Hee Chan Kim 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.95 No.6
Purpose: Increased robotic surgery is attended by increased reports of complications, largely due to limited operative view and lack of tactile sense. These kinds of obstacles, which seldom occur in open surgery, are challenging for beginner surgeons. To enhance robotic surgery safety, we created an augmented reality (AR) model of the organs around the thyroid glands, and tested the AR model applicability in robotic thyroidectomy. Methods: We created AR images of the thyroid gland, common carotid arteries, trachea, and esophagus using preoperative CT images of a thyroid carcinoma patient. For a preliminary test, we overlaid the AR images on a 3-dimensional printed model at five different angles and evaluated its accuracy using Dice similarity coefficient. We then overlaid the AR images on the real-time operative images during robotic thyroidectomy. Results: The Dice similarity coefficients ranged from 0.984 to 0.9908, and the mean of the five different angles was 0.987. During the entire process of robotic thyroidectomy, the AR images were successfully overlaid on the real-time operative images using manual registration. Conclusion: We successfully demonstrated the use of AR on the operative field during robotic thyroidectomy. Although there are currently limitations, the use of AR in robotic surgery will become more practical as the technology advances and may contribute to the enhancement of surgical safety.
Comorbidity as skin cancer in atopic dermatitis: using national health insurance data in Korea
( Dongheon Lee ),( Hyejung Jung ),( Donghyek Jang ),( Jaein Lee ),( Jooyoon Bae ),( Miyeon Park ),( Jiyoung Ahn ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: It is well known that atopic dermatitis(AD) is associated with other allergic diseases. Lately, links to diseases other than allergic disease have also been actively studied. Among them, the results of studies about AD comorbidities especially skin cancer, vary from country to country. Objectives: To analyze whether the risk of skin cancer is different between AD patients and healthy controls, using National Health Insurance Data in Korea. Methods: We got data from 2005 to 2016 from the Korean National Health Insurance Research Database. AD patients were selected as patients with one atopic dermatitis code and two AD-related tests. The control group matched the age and sex of AD patients. AD groups and Non-AD groups were selected as ratios of 1:5. And then, each group was investigated for skin cancer (basal cell carcinoma, squamous cell carcinoma, melanoma, Bowens disease, actinic keratosis). Results: The incidence of skin cancer were significantly different between AD group and control group. The risk of skin cancer of AD patients was significantly higher than that of control group. Patients with AD had significantly higher risk of skin cancer (HR=52.24, CI 42.01~64.98, p<0.001). Conclusion: Patients with AD have a greater risk of skin cancer than those without AD.
( Dongheon Lee ),( Hyejung Jung ),( Donghyek Jang ),( Jaein Lee ),( Jooyoon Bae ),( Miyeon Park ),( Jiyoung Ahn ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: It is well known that atopic dermatitis(AD) is associated with other allergic diseases. Lately, links to diseases other than allergic disease have also been actively studied. Among them, the results of studies about AD comorbidities especially cardiovascular disease (CVD), vary from country to country. Objectives: To analyze whether the risk of CVD is different between AD patients and healthy controls using National Health Insurance Data in Korea. Methods: We got data from 2005 to 2016 from the Korean National Health Insurance Research Database. AD patients were selected as patients with one atopic dermatitis code and two AD-related tests. The control group matched the age and sex of AD patients. AD groups and Non-AD groups were selected as ratios of 1:5. And then, each group was investigated for accompanying metabolic syndrome and cardiovascular disease. Results: The incidence of metabolic diseases and CVD were significantly different between AD group and control group. Not only metabolic disease, but also CVD risk of AD patients was significantly higher than that of control group. Patients with AD had significantly higher risk of hyperlipidemia, hypertension and type 2 diabetes. AD patients also had higher risk of stroke myocardial infarction, angina and peripheral vascular disease. Except for hyperlipidemia, there was no difference in risk according to AD severity. Conclusion: Patients with AD have a greater risk of CVD than those without AD.