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단상 가상 동기기의 성능 개선을 위한외란 관측기 기반 가상 임피던스 구현
허건,박용순 전력전자학회 2024 전력전자학회 논문지 Vol.29 No.2
The performance of a virtual synchronous generator(VSG) depends not only on its inherent parameters, such as inertia and droop coefficients, but also on the output impedance of the inverter. If the output impedance of the inverter is not adequate, the output power of the VSG may fluctuate. In this paper, a method for implementing the virtual impedance based on a disturbance observer(DOB) in a single-phase VSG was proposed. In the proposed method, the output impedance of the inverter can be adjusted by a simple frequency-domain DOB. An output voltage distortion due to the nonlinearity of the inverter was compensated by the DOB. After the basic principle and design method of the proposed DOB were explained, the effectiveness of the proposed method was validated with the hardware-in-the-loop simulation.
허건,유영삼,김상우 대한이비인후과학회 2011 대한이비인후과학회지 두경부외과학 Vol.54 No.5
Background and Objectives This study was conducted to gather basic information of virtual endoscopy (VE) in detecting and gaining information of tracheoesophageal foreign body (FB) models. Subjects and Method The chest model was made using a PVC bottle, a plastic tube, a vinyl tube and a plaster. Fish bones, shells and plastic toys were used to simulate foreign bodies of tracheoesophageal model. CT of the chest model was reconstructed three-dimensionally by using the Rapidia software for virtual endoscopy of foreign body models. The virtual endoscopic images were compared with real foreign body materials as to shape, size, location and orientation. Results Tracheoesophageal FB models were easily made. CT data gave good 3D images and virtual endoscopic images showed realistic foreign body materials. Conclusion The results indicate the usefulness of converting CT data into virtual endoscopic images so as to help in the diagnosis of foreign bodies.
창의적인 식품 개발에 있어서 SIT의 효과성에 관한 연구 - H사의 신제품을 중심으로 -
허건,송해근,심재헌,박영택 한국품질경영학회 2016 품질경영학회지 Vol.44 No.1
Purpose: This study aims to investigate the effect of product creativity on the financial performance of new product in the food industry. In addition, the applicability of creative thinking method for the development of creative new food product is examined. Methods: In this study, OPA(Originality-Practicality Analysis) method is applied to evaluate the creativity of 32 new food products of ‘H’ food company in Korea. Effects of product creativity on the financial performance are analyzed using t-test and logistic regression analysis. In order to examine the applicability of SIT(Systematic Inventive Thinking) for the new product development process, each subject are classified according to five SIT tools. Results: The product group belongs to creative area(CA) shows the highest financial performance among the quadrants of OPA matrix. The products are divided into two groups whether the product can be classified by SIT tools or not. The products belonged to SIT group show higher creativity than non-SIT group. Conclusion: From the result, it can be concluded that product creativity has effect on the financial performance of the new food products, and SIT can be used as a powerful tool in developing creative new food products.
허건,오민석 大田大學校 附屬 韓方病院 2019 惠和醫學 Vol.28 No.2
Objectives : Hwangryunhaedok-tang. a traditional Korean herbal medicine, has been widely used for the treatment. This study is purposed to analyze the research trend of Hwangryunhaedok-tang in Korea for developing further research plan. Methods : A search of Korean research database( OASIS, RISS, Korean traditional knowledge portal, NDSL) was conducted to find studies for Hwangryunhaedok-tang. We analyzed studies by publish date, speciality, study method, and field of study. Result : 1. 2.65 papers were published annually on average. 2. After analyzing for the speciality of the journal, most of the papers were published in Traditional Korean Medicine. 3. After analyzing for the study method, in vivo was 33.96%, in vitro was 32.08% and quantitative inspection was 13.21% 4. After analyzing for the subject of the studies, beneficial effect was 81.13%, quantitative and qualitative analysis was 13.21%, toxicity was 3.77% 5. Papers on beneficial effect were classified by the type of diseases. Hwangryunhaedok-tang was most used in skin disease. Conclusions : Hwangryunhaedok-tang is effective in various category of diseases. This study will be useful to future researchers and clinicians to conduct a study on Hwangryunhaedok-tang
저수지 안전관리를 위한 위험도 해석의 필요성과 도입방안
허건,Heo, Gun 한국농공학회 2016 한국농공학회논문집 Vol.58 No.2
Korea has 17,500 irrigation dams and facing variety of causes that jeopardize dam safety. With limited resources available to manage large inventory, a portfolio risk analysis application method for numerous irrigation dam safety is essential. The purpose of this study is to find an optimum way to adopt the risk analysis to the large number of irrigation dams in Korea and to propose the portfolio risk analysis process for irrigation dams. In this study, the necessity of the risk analysis for reservoirs safety has been suggested and a phased process using pre-screening and screening methodology has been proposed. This proposed procedure will help to effectively introduce the risk analysis for reservoirs safety in Korea.
흡연 행태와 간접흡연 노출이 근로자의 정신건강에 미치는 영향: 코로나19 팬데믹 전후의 변화를 중심으로
허건,황지은 사단법인 대한보건협회 2023 대한보건연구 Vol.49 No.4
Purpose:The objective of this study is to identify the effect of the worker’s smoking behavior and secondhand smoke (SHS) on their mental health before and during COVID-19 in the Republic of Korea. Methods:Six years of data (2016-2021) from the Korea National Health and Nutrition Examination Survey (KNHANES) were analyzed. Excluding missing values, 13,086 respondents before COVID-19 pandemic (gray collar 3,139, white collar 2,424, pink collar 2,757, blue collar 4,766) and 5,857 respondents during the pandemic (gray collar 1,356, white collar 1,079, pink collar 1,287, blue collar 2,135) were studied. The effect of smoking behavior and SHS on mental health was analyzed by chi-square test and logistic regression analysis. Results:In this study, we found that the occupation which was exposed most frequently to SHS before and during COVID-19 pandemic was blue collar. Before COVID-19, exposure to SHS was significantly associated with higher stress compared to non-exposure in all occupations except gray collar(p<.05). During COVID-19 pandemic, the effect of SHS on worker’s perceived stress was not identified(p>.05). Mental counseling experience of gray collar and blue collar was mental health variable which effected by SHS exposure during COVID-19(p<.05). Conclusion:As modern society changes more complicated, workers live with a psychological pressure to adapt. It is reported that worker’s diseases are related to various mental health. Because the way how the worker’s smoking behavior effects their mental health differs by occupational group, targeting strategies selecting the vulnerable group and more sophisticated post-COVID-19 policies should be established.