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A Study on the Status and Spatial Autocorrelation of Vacant Houses in Jeollabuk-do, South Korea
김준영 한국농촌건축학회 2024 농촌건축 : 한국농촌건축학회논문집 Vol.26 No.2
Many houses have been left vacant in cities worldwide due to changes in the economy, society, and urban composition. The increase in vacant houses causes social problems and decrease in the value of real estate. Considering the cost of preparing a new residence because the existing residence no longer functions, it is an important problem to solve empty houses in the existing residence. Accordingly, policy attempts and studies to reduce and utilize vacant houses are in progress in various countries. In South Korea, the ratio of vacant houses was 6.4% of all houses as of 2021, and in Jeolla-buk-do, it was 11.6%, which is higher than the national average. Jeollabuk-do conducted a fact-finding survey on countermeasures against vacant houses; 17,732 vacant houses (2.4%) were surveyed. The urbanization, population, and terrain of Jeollabuk-do, consisting of 14 cities and counties, were considered. The ratios, types, grades, and spatial autocorrelations of vacant houses were analyzed after classification into city areas (focus, small, and medium) and county areas (plains and mountains) areas to derive policies according to the distribution of vacant houses. The average difference in ratio, type, grade, and spatial autocorrelation of vacant houses was used to analyze the characteristics of the distribution of vacant houses according to these classifications. There were significant differences in the averages of the ratios, grades, and spatial autocorrelations between city and county areas. The autocorrelation of vacant house distribution exhibited differences between urban and county areas.
복수의 엣지 디바이스에서의 CNN 모델 분산 처리를 위한 축소된 분류 모델 활용 기법
김준영,전종호,기민관,박기호 한국정보과학회 2020 정보과학회논문지 Vol.47 No.8
최근 클라우드 서버로 전송되는 막대한 양의 데이터로 인해 발생하는 네트워크 부하 등의 여러 문제로 인하여, 데이터의 수집이 이루어지는 네트워크의 말단에서 자체적으로 데이터를 처리하는 엣지 컴퓨팅에 대한 요구가 증가하고 있다. 그러나 네트워크 말단에 위치한 엣지 디바이스는 대부분 성능이 제한되어 있어 클라우드 서버에서 사용되는 딥러닝 응용을 그대로 사용하기에는 어려움이 있다. 이러한 문제를 극복하기 위해, 본 논문에서는 딥러닝 모델을 축소된 분류 모델들로 나누어 활용해 복수의 엣지 디바이스에서 공동으로 추론을 수행하는 분산 처리 기법을 제안하였다. 여기서 사용된 축소된 분류 모델은 경량화 된 모델 가중치를 가지며, 전체 분류 레이블 중 일부에 해당하는 레이블에 대해 추론을 진행한다. 성능 측정 결과 제안하는 축소된 분류 모델의 결과를 취합하는 분산 처리 기법의 정확도가 기존 모델 대비 더 적은 파라미터를 갖도록 경량화를 하여도 기존 모델과 유사한 수준을 유지할 수 있음을 확인하였다. Recently, there have been increasing demands for edge computing that processes data at the end of the network wherein data is collected because of various problems such as network load caused by a large amount of data transfer to a cloud server. However, it is difficult for edge devices to use deep learning applications used in cloud servers because most edge devices at the end of the network have limited performance. To overcome these problems, this paper proposes a distributed processing method that uses reduced classification models to jointly perform inferences on multiple edge devices. The reduced classification models have compressed model weights, and perform inferences for some parts of the total classification labels. The experimental results confirmed that the accuracy of the result of the proposed distributed processing method is similar to the accuracy of the result of the original model, even if the proposed reduced classification models had much less parameters than those of the original model.
김준영 한국철학회 2022 철학 Vol.- No.150
The notion of compossibility has been one of the most hotly contested issues among Leibniz scholars. In this paper, I will examine four influential interpretations and demonstrate their shortcomings. Moreover, I will show that one crucial issue has been largely overlooked: According to Leibniz, the compossibility relation is intransitive. Intransitivity will be a new challenge for the above interpretations; despite their differences, they seem to agree that compossibility relation is transitive. By showing this, I raise a new objection to all the existing interpretations of compossibility. 공가능성(compossibility) 개념은 라이프니츠 연구자들 사이에서 가장 활발하게 연구되고 있는 분야 중 하나이다. 이 논문에서 나는 우선 공가능성에 대한 영향력 있는 네 가지 해석들을 살펴보고 각 해석의 장단점을 지적한다. 더불어 나는 그동안 연구자들 사이에서 간과되었던 한 가지 문제를 지적한다. 공가능성에 대한 영향력 있는 해석들은 모두 명시적 혹은 암묵적으로 공가능성을 이행적(transitive)인 관계로 파악하고 있다. 그러나 나는 이 논문에서 라이프니츠가 공가능성을 비이행적인 관계로 이해하고 있음을 보임으로써, 공가능성에 대한 기존의 해석들에 대한 새로운 문제를 제기한다.
김준영,김성환,권혁우,고한규 한국냄새환경학회 2014 실내환경 및 냄새 학회지 Vol.13 No.4
This study was carried out to measure temperature, humidity, and bacterial concentration and species from theindoor air of a greenhouse used for shiitake cultivation. The highest level of humidity in the greenhouse wasrecorded at over 91.5% and the lowest humidity was recorded at 50% during 12 months. Temperature was between5.1-30.5oC except for January. These results indicate that bacteria can survive in the indoor air of the greenhouse. Total bacterial concentration exceeded the Korean indoor air quality standard value (8.0 × 102 cfu/m3) in winter. A total of 13 genera and 17 species were isolated and identified from the indoor air of the greenhouse. Especially,3 species (Kocuria rosea, Staphylococcus xylosus and Curtobacterium flaccumfaciens) have been reported to affecton human health. This is first report of airborne bacteria in a greenhouse used for shiitake cultivation.