• 한국IT서비스학회지
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• 제21권3호
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• pp.63-72
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• 2022

The extinction crisis of local cities, caused by a population density increase phenomenon in capital regions, directly causes the increase of vacant houses in local cities. According to population and housing census, Gunsan-si has continuously shown increasing trend of vacant houses during 2015 to 2019. In particular, since Gunsan-si is the city which suffers from doughnut effect and industrial decline, problems regrading to vacant house seems to exacerbate. This study aims to provide a foundation of a system which can predict and deal with the building that has high risk of becoming vacant house through implementing a data driven vacant house prediction machine learning model. Methodologically, this study analyzes three types of machine learning model by differing the data components. First model is trained based on building register, individual declared land value, house price and socioeconomic data and second model is trained with the same data as first model but with additional POI(Point of Interest) data. Finally, third model is trained with same data as the second model but with excluding water usage and electricity usage data. As a result, second model shows the best performance based on F1-score. Random Forest, Gradient Boosting Machine, XGBoost and LightGBM which are tree ensemble series, show the best performance as a whole. Additionally, the complexity of the model can be reduced through eliminating independent variables that have correlation coefficient between the variables and vacant house status lower than the 0.1 based on absolute value. Finally, this study suggests XGBoost and LightGBM based machine learning model, which can handle missing values, as final vacant house prediction model.

• 복식문화연구
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• 제28권2호
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• pp.166-180
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• 2020

This oral history study explores the past and present Japanese menswear custom-tailoring culture. Two master tailors with more than 50 years of experience and two young tailors with less than a year of experience were interviewed about the tailor training process and environment, working conditions, thinking and behavior, and societal and governmental efforts for vitalizing custom-tailoring. The results indicate, first, a 10-year apprenticeship was required in the past, whereas young tailors today must register for three-year professional tailoring classes. Tailors then and now have been trained in a similar sequence of pants, vests, and jackets. Second, regarding working conditions, tailors had to provide gratitude services to their masters for a few years, even after their training ended. In contrast, young tailors today must continue a probationary period after their three-year schooling; however, they experience difficulty with finding tailoring shops for their probation. Third, in terms of thinking and behavior, master tailors learned their trade to earn a living, whereas young tailors today entered the field due to their interests in it. In addition, young tailors want a systematic learning process, whereas master tailors learned their skills while on the job. Last, tailoring academies today are run by tailoring shops and societies. Career exploration programs are offered to elementary and middle school students by the Kobe government in association with the local tailoring society to provide tailoring experiences.

• 농업과학연구
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• 제33권1호
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• pp.43-56
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• 2006

In this thesis we aim at analyzing international competitive power of Chinese ginseng in comparison with Korean ginseng and searching policy direction for Korea to compete Chinese ginseng industry. We summarized the research results as follows; First, we examine the structural change of ginseng industry of China. Second, we review the theories for international competitiveness and apply the method of analyzing competitiveness to ginseng industry. Third, we compared the international competitive power of the ginseng industry between China and Korea and found that Chinese ginseng, estimated by Revealed Comparative Advantage(RCA) at about 15, still remains high competitiveness in terms of cost and price but lowering price competitiveness recently. Based on the research results, we suggest export promotion strategies of the Korean ginseng as follows; 1) Korean government should enforce trade cooperation with China so as to register Korean root ginseng an importable medicine. 2) Korean ginseng producer should develop various products such as capsules, powders and etc. according to China's consumer purchasing power and taste. 3) Korean ginseng should be sold as an differentiated commodity so that it will contribute to building consumer loyalty to Korean ginseng, makes market share superior to other cheaper ginseng products in China. 4) In order to be effective brand marketing and product advertisement, there should be established reliable networks to process and distribute Korean ginseng products exclusively.

• 융합보안논문지
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• 제13권5호
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• pp.197-205
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• 2013

사회안전과 질서유지를 위하여 Security를 연구하는 학문이다. 비록 산업계에 비하여 18년이라는 짧은 기간이지만, 다방면의 학자들이 이 분야에 관심으로 가지고 많은 노력을 해왔다. 그러나 지금의 경호학은 몇 가지 문제점들을 안고 있어서 학문으로써의 가치를 인정받기 어려운 실정이다. 이를 위해서 몇 가지 선결과제가 해결이 되어야 한다. 첫째, 학문적인 개념과 범위 설정에 대한 산학간의 합의점 마련. 둘째, 모호한 학문의 정체성을 확립하기 위한 학적체계의 정립. 셋째, 교육체계의 정비부족을 극복하기 위한 교육체계 정립 방안의 마련. 넷째, 산업계와 상이한 연구방향에 대한 비가시성을 극복하기 위한 방안 등을 들 수 있다. 따라서 이 연구는 경호학이 학문으로써의 정체성과 가치를 높이기 위하여 네 가지 선결과제를 중심으로 그에 따른 대안을 제시하도록 하는데 목적을 두었다.

• 전자공학회논문지C
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• 제34C권7호
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• pp.38-50
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• 1997

This paper concerns a VHDL design and simulation of an accurate and cost-effective fuzzy logic controller (FLC). The accurcy of the proposed FLC is obtained by using the center of gravity (COG) defuzzifier that considers both membership values and spans of membership functions in calculating a crisp value. The cost-effectiveness of the proposed FLC is obtained by restructuring the conventional FLC in the following ways: Firstly, the MAX-MIN inference is inference is replaced by a read-modify-write operation that can be implemented economically in the structure of register files. Secondly, the division in the COG defuzzifier is avoided by finding the moment equilibrium point. The proposed COG defuzzifier has two disadvantages that it requires additional multipliers and it takes a lot of computation time to find the moment equilibrium point. The first disadvantage is overcome by replacing the mulitpliers with stochastic AND operations and the second disadvantage is alleviated by using a coarse-to-fine searching algorithm. The proposed FLC is described in VHDL structurally and behaviorally and whether it is working well or not is checked on SYNOPSYS VHDL simulator by using the truck backer-upper control problem.

• 전자공학회논문지SC
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• 제49권2호
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• pp.1-9
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• 2012

본 논문에서는 이원화된 필드버스 기반의 선박 엔진용 분산 제어시스템을 설계 및 구현한다. 구현된 시스템은 엔진의 상태 값을 감시하기 위해서 CAN과 MODBUS 프로토콜을 혼합 형태로 이용하여 서로 다른 영역의 통신 구조로 구성한다. 첫 번째 층은 CAN프로토콜을 이용하여 엔진의 상태 값을 공유하게 된다. 두 번째 층은 MODBUS를 이용하여 엔진룸에서 기관실의 AMS로 모니터링 데이터 전송을 위한 통신을 지원한다. 테스트 베드 환경을 구축하여 구현된 시스템을 선급기술규칙의 요구사항에 의거하여 테스트 및 성능 검증하였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.136-141
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• 2009

This paper proposed a framework for handover method in continuously tracking a person of interest across cooperative pan-tilt-zoom (PTZ) cameras. The algorithm here is based on a robust non-parametric technique for climbing density gradients to find the peak of probability distributions called the mean shift algorithm. Most tracking algorithms use only one cue (such as color). The color features are not always discriminative enough for target localization because illumination or viewpoints tend to change. Moreover the background may be of a color similar to that of the target. In our proposed system, the continuous person tracking across cooperative PTZ cameras by mean shift tracking that using color and shape histogram to be feature distributions. Color and shape distributions of interested person are used to register the target person across cameras. For the first camera, we select interested person for tracking using skin color, cloth color and boundary of body. To handover tracking process between two cameras, the second camera receives color and shape cues of a target person from the first camera and using linear color calibration to help with handover process. Our experimental results demonstrate color and shape feature in mean shift algorithm is capable for continuously and accurately track the target person across cameras.

• 한국지리정보학회지
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• 제11권4호
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• pp.172-181
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• 2008

건축물의 수명은 생명체처럼 유한적이기 때문에 지속적으로 철거와 신축을 반복한다. 그러나 수명에 대한 물리적 기준이 주관적이며 추상적이기 때문에 국가의 정책결정에 좌우되어 왔다고 해도 과언이 아니다. 이러한 문제를 해결하고자 건축물의 노후정도에 관한 명확한 자료를 구축 후 그에 따른 의사결정 의 필요성이 지속적으로 대두되었다. 이러한 배경하에 본 연구에서는 부산광역시의 14개구 214개의 행정동을 대상으로 노후건축물 의 DB구축하고 그에 따른 활용방안을 제시하고자 하였다. 본 연구에서 도출된 개선방안을 요약하면 다음과 같다. 첫째, 지식정보격차 완화를 위한 기초자료를 제공하였다. 둘째, 부산광역시의 노후 불량건축물의 세부적인 내용과 산출결과를 제시하여 조례제정을 위한 자료를 마련하였다.

• 건축역사연구
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• 제27권2호
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• pp.17-28
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• 2018

This study explores the space and society of Seorin-bang(瑞麟坊), using the Hanseong-bu family registry from the Gwangmu period to demonstrate the urban organizational units used during the late Joseon dynasty known as Seo(署)-Bang(坊)-Gye(契)-Dong(洞)-Tong(統)-Ho(戶). It seeks to examine how Seorin-bang's space and society changed with time. First, the study offers approximate demarcation for Gye and Dong through spatial verification of Bang-Gye-Dong-Tong-Ho of Seorin-bang in late Joseon Dynasty, whose precise locations were formerly undetermined. Second, it explores the relationships between Bang-Gye-Dong-Tong-Ho which has been widely understood to be hierarchical by previous studies, and classifies the relationship dynamics between Gye and Dong into four types. Third, the study finds that Seorin-bang retained much of its urban structure including roads, plots, and streams and maintained stable population distribution under the Japanese colonial rule, and continuously served as place of residency for many throughout the Gwangmu period. This study has major implications in that it illustrates space and society of Seorin-bang by converting the family registry from the late Joseon Dynasty into spatial data, and observes its changes subsequent to the Japanese colonial rule.

• 디지털산업정보학회논문지
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• 제14권4호
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• pp.17-26
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• 2018

Connected car plays an important role on Intelligent Transport System (ITS). ITS is able to secure drivers' convenience and safety, however, the overall system can be threatened by hacking attempt. Blockchain is one strong candidate of the remedy to promote the security of the ITS network. However, there will be many challenges to adopt previously proposed blockchain technologies to ITS. This work presents a new ITS structure based on blockchain technology. Proposed scheme includes three major layers. The first layer is central manager which is initiated once to register a certain connected car. The third layer is RSU (Road Side Unit) layer which exploits PoS (Proof of Stake) for consortium blockchains and retains real-time information. In addition, this layer performs block expiration based on timers to maintain manageable block length. In the second layer, the generated blocks of the third layer without expiration are housed as private blockchains. We finally demonstrate possible merits of newly proposed scheme.