• 한국콘텐츠학회논문지
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• 제18권5호
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• pp.367-375
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• 2018

본 연구에서는 영화 관람 후 높은 평점을 매긴 집단과 낮은 평점을 매긴 집단 중 어느 집단이 영화에 대해 더 많은 이야기를 하는지, 즉 온라인 리뷰를 길게 작성하는지에 대해 알아보고자 하였다. 이를 위해 네이버 영화 API에서 제공하는 영화 평점과 리뷰 데이터를 수집하였고, 한국영화진흥위원회에서 제공하는 영화 손익분기점 데이터를 이용하여 영화를 흥행성공, 흥행부진, 흥행실패로 구분하여 영화 평점과 리뷰길이 간의 상관관계, 영화 개봉 전과 후, 흥행여부에 따른 리뷰길이의 특성, 마지막으로 영화 평점이 리뷰길이에 영향을 미치는가에 대한 회귀분석을 실시하여 제시하였다.

• 산업기술연구
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• 제33권A호
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• pp.31-39
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• 2013

There are two methods to make a distinction of deterioration of high-speed railway track. One is that an administrator checks for each attribute value of track induction data represented in graph and determines whether maintenance is needed or not. The other is that an administrator checks for monthly trend of attribute value of the corresponding section and determines whether maintenance is needed or not. But these methods have a weak point that it takes longer times to make decisions as the amount of track induction data increases. As a field of artificial intelligence, the method that a computer makes a distinction of deterioration of high-speed railway track automatically is based on machine learning. Types of machine learning algorism are classified into four type: supervised learning, unsupervised learning, semi-supervised learning, and reinforcement learning. This research uses supervised learning that analogizes a separating function form training data. The method suggested in this research uses SVM classifier which is a main type of supervised learning and shows higher efficiency binary classification problem. and it grasps the difference between two groups of data and makes a distinction of deterioration of high-speed railway track.

• 한국컴퓨터산업학회논문지
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• 제3권2호
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• pp.217-226
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• 2002

3차원 공간에 물체를 입체감 있게 표현하는 것은 중요한 일이다. 물체를 사실적으로 보이게 하기 위해서는 원근감, 입체감, 물체의 재질, 그림자, 빛의 세기 등 여러 요소가 고려되어야 한다. 그 중 그림자는 물체의 사실적 표현에 중요한 역할을 한다. 그림자를 그리기 위한 방법에는 반복적인 수많은 연산을 해야하고 이것은 많은 처리 시간을 필요로 한다. 즉 수많은 점들에 대한 그림자 영역 판단과 빛의 세기 판단 등을 해야하고 이것으로 인해 시간이 많이 걸리게 된다. 본 논문에서는 물체에 대한 사실적인 표현을 어느 정도 유지하는 범위내에서 그림자를 영역별로 분리해 빠르게 계산하여 표현해 주는 방법을 제시한다.

• 대한기계학회논문집B
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• 제25권5호
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• pp.653-659
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• 2001

This paper is concerned with the development of a new method for making and separating ice in-water and saving floated ice by installing an evaporation panel in an ice storage tank. The new method shows very good heat transfer efficiency than that of the convectional method. It is because the evaporation panel is directly contacted with water in the storage tank. The experiments were performed by varying inlet and outlet refrigerant temperatures of its evaporator. From the experimental results, the operating characteristics of in-water harvest-type ice storage system were investigated by measuring temperature and pressure at each point of the ice storage system and power required to operating compressor respect to the changes of the inlet and outlet refrigerant temperature of evaporator. It can be think that defrost frequency decreased and heavy ice created as the refrigerant temperature of evaporator outlet and defrost setting temperature is low so gotten result can effect to release efficiency. Also, consumption power, condensing heat quantity, refrigerating capacity and performance efficiency decreased as time goes by. Therefore, these results provide the basic data for system optimization, performance improvement and the possibility of application to other fields.

• 한국실내디자인학회논문집
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• 제21권6호
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• pp.177-185
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• 2012

The endowed privilege to an established profession acts as an important motivation related to professionalization of occupations. The established profession enjoys cognitive, legal, and economic privilege. This study analyzes the professionalization process of interior design. Specifically, the study evaluates the suitability of the body of knowledge and professional ethos(i.e., protection of citizen's health, safety, and welfare), while analyzing the professionalization of interior design in the United States. The research aims at proposing a reference point for the professionalization of Korean interior design. Utilized data include research paper, court sentencing, and reports published by related professional organizations. The study concludes that 3E's are a means of professionalization of interior design, while separating interior design from interior decorating. In addition, there is no evidence to the protection of citizen's HSW. Rather, it increases service costs and restricts the job opportunities. When the public is not persuaded, the argument related to the necessity of license for the protecting citizen's HSW can be consumed as a mere rhetoric, concealing intentions for formulating a cartel. Thus, this study proposes that the professionalization of interior design may focus on the establishment of identity and body of knowledge, which are specific to interior design.

• Journal of Communications and Networks
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• 제18권3호
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• pp.420-428
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• 2016

In this paper, we investigate the scheduling and power allocation for coordinated multi-point transmission in downlink long term evolution advanced (LTE-A) systems, where orthogonal frequency division multiple-access is used. The proposed scheme jointly optimizes user selection, power allocation, and modulation and coding scheme (MCS) selection to maximize the weighted sum throughput with fairness consideration. Considering practical constraints in LTE-A systems, the MCSs for the resource blocks assigned to the same user need to be the same. Since the optimization problem is a combinatorial and non-convex one with high complexity, a low-complexity algorithm is proposed by separating the user selection and power allocation into two subproblems. To further simplify the optimization problem for power allocation, the instantaneous signal-to-interference-plus-noise ratio (SINR) and the average SINR are adopted to allocate power in a single cell and multiple coordinated cells, respectively. Simulation results show that the proposed scheme can improve the average system throughput and the cell-edge user throughput significantly compared with the existing schemes with limited feedback.

• Journal of Magnetics
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• 제21권4호
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• pp.635-643
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• 2016

Improvements were made in the study for the design of the conventional Eddy Current Separator (ECS) used for separating small sized non-ferrous particles in the waste. These improvements include decreasing the air gap between the material and magnetic drum, making the drum position adjustable and placing the splitter closer to the drum. Thus, small particles were separated with high efficiency. The magnetic drum was removed from inside the ECS conveyor belt system as design change and was placed as a separate unit. Hence, the force generated on the test material increased by about 5.5 times while the air gap between the non-ferrous materials and drum decreased from 3 mm to 1 mm. The non-metal material in the waste is separated before the drum in the novel design. Whereas non-ferrous metal particles are separated by falling into the splitter as a result of the force generated as soon as the particles fall on the drum. Every material that passes through the drum can be recycled as a result of moving the splitter closer to the contact point of the drum. In addition, the drum can also be used for the efficient separation of large particles since its position can be adjusted according to the size of the waste material. The performance of the novel design ECS was verified via analytical approaches, finite element analysis (FEA) and experimental studies.

• 한국입자에어로졸학회지
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• 제17권3호
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• pp.71-79
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• 2021

Ultrafine dust, which is emitted from industrial factories or all kinds of vehicles, threatens the human's respiratory system and our environment. In this regard, separating airborne particles is essential to mitigate the severe problem. In this work, an axial cyclone for the effective technology of eliminating harmful dust is investigated by numerical simulation using Ansys 2020, Fluent R2. In addition, the optimized structure of the cyclone is constructed by means of multi objective optimization based on the response surface method which is a representative method to analyze the effect of design parameter on response variables. Among several design parameters, the modified length of the vortex finder and dust collector is a main point in promoting the performance of the axial cyclone. As a result, the optimized cyclone exhibits remarkable performance when compared to the original model, resulting in pressure drop of 307 Pa and separator efficiency of 98.5%.

• Wind and Structures
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• 제38권4호
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• pp.277-293
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• 2024

The recorded thunderstorm winds at a point contain tri-directional components. The probabilistic characteristics of such recorded winds in terms of instantaneous mean wind speed and direction, and the probability distribution and the time-frequency dependent crossed and non-crossed power spectral density functions for the high-frequency fluctuating wind components are unclear. In the present study, we analyze the recorded tri-directional thunderstorm wind components by separating the recorded winds in terms of low-frequency time-varying mean wind speed and high-frequency fluctuating wind components in the alongwind direction and two orthogonal crosswind directions. We determine the time-varying mean wind speed and direction defined by azimuth and elevation angles, and analyze the spectra of high-frequency wind components in three orthogonal directions using continuous wavelet transforms. Additionally, we evaluate the coherence between each pair of fluctuating winds. Based on the analysis results, we develop empirical spectral models and lagged coherence models for the tri-directional fluctuating wind components, and we indicate that the fluctuating wind components can be treated as Gaussian. We show how they can be used to generate time histories of the tri-directional thunderstorm winds.

• 정보처리학회논문지B
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• 제11B권4호
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• pp.429-436
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• 2004

본 논문에서는 침도를 추가한 뉴우턴법과 할선법에 기초한 고정점 알고리즘의 독립성분분석을 각각 제안하였다. 여기서 첨도의 추가는 유사한 속성을 가지는 성분의 군집화된 분석순서를 얻기 위함이고, 고정점 알고리즘은 학습파라미터와 무관한 빠른 성분분석과 우수한 분석성능을 얻기 위함이다. 제안된 두 가지 독립성분분석 각각을 500개 샘플을 가지는 6개의 혼합신호와 $512\times512$ 픽셀을 가지는 10개의 혼합영상 분리에 각각 적용한 결과, 제안된 두 가지 기법은 항상 일정한 분석순서를 유지하여 첨도가 추가되지 않은 기존의 기법들에서 알고리즘의 수행 때마다 랜덤하게 변하는 분석순서의 제약을 해결할 수 있었다. 특히 군집화의 속성을 가진 제안된 독립성분분석들은 신호나 영상의 분류나 식별에도 적용할 수 있다. 한편 할선법의 제안된 기법이 뉴우턴법의 제안된 기법보다 빠르면서도 우수한 분리성능이 있음을 확인하였다.