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컴퓨터 시뮬레이션을 이용한 음의 사각지역 및 음상의 경제적 개선방안 연구
고은지,이현수,이경량,김성권,Ko, Eun-Ji,Lee, Hyun-Soo,Lee, Kyung-Ryang,Kim, Seong-Kweon 한국전자통신학회 2011 한국전자통신학회 논문지 Vol.6 No.5
In this paper, most of the church except for a large church has accommodated many audience to install a balcony floor in a small space. therefore, dead zone and dislocated sound image localization is made due to this under-balcony seats. This paper propose that the problems of dead zone and dislocated sound image localization could be solved using computer simulation in the view of practical side. The economical computer simulation tool, Mapp online that can be found easily was used to the specified church. Installation a sub speaker for dead zone and -10 dB power control of the sub speaker to main speaker power for dislocated sound image localization was proposed. Computer simulation result shows that the value of definition for area was improved from "Normal" to "Very Good" which means about 52% improvement.
고은지,김명준,Ko, Eun-Ji,Kim, Myoung-Jun 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.5
In remote gaze tracking system using infra-red LEDs, calibrating the position of reflected light is essential for computing pupil position in captured images. However, there are limitations in reducing errors because variable locations of head and unknown radius of cornea are involved in the calibration process as constants. This study purposes a gaze tracking method based on pupil-corneal reflection that does not require user-calibration. Our goal is to eliminate the correction process of glint positions, which require a prior calibration, so that the gaze calculation is simplified.
시선 추적 시스템에서의 호모그래피를 이용한 글린트 복원 알고리즘
고은지,김명준,Ko, Eun-Ji,Kim, Myoung-Jun 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.10
Remote gaze tracking system calculates the gaze from captured images that reflect infra-red LEDs in cornea. Glint is the point that reflect infra-red LEDs to cornea. Recently, remote gaze tracking system uses a number of IR-LEDs to make the system less prone to head movement and eliminate calibration procedure. However, in some cases, some of glints are unable to spot. In this case, it is impossible to calculate gaze. This study examines patterns of glints that are difficult to detect in remote gaze tracking system. Afterward, we propose an algorithm to reconstruct positions of missing glints that are difficult to detect using other detected glints. Based on this algorithm, we increased the number of valid image frames in gaze tracking experiments, and reduce errors of gaze tracking results by correcting glint's distortion in the reconstruction phase.
공극률과 건조율을 이용한 다공질 사암의 투과도 추정방법 제안
고은지 ( Eun Ji Ko ),김진후 ( Jin Hoo Kim ) 한국지구물리·물리탐사학회 2014 지구물리와 물리탐사 Vol.17 No.3
As the permeability is an important parameter to characterize the ease with which a porous medium transmits fluids, it is usually obtained by fluid flow experiment using core samples. In order to measure the permeability, however, an experimental apparatus is required and it might take long measurement time, especially for tight samples. In this study, the relationship between permeability and porosity as well as drying rate has been investigated to predict the permeability without a series of measuring experiments. Porosity is measured by drying monitoring method, which measures weight variation continuously while drying surface-dried saturated sample, and drying rate is obtained from weight variation ratio with respect to the water saturation. The total of 6 Berea sandstone samples, which have a permeability range of 70 to670 mD, were used in this work, and a new and empirical equation which could predict permeability of porous sandstone by using porosity and drying rate were obtained through regression analysis.
20세기 전반 소통 매체의 다양화와 잡가의 존재 양상 -잡가집과 유성기 음반을 중심으로-
고은지 ( Eun Ji Ko ) 한국고전문학회 2007 고전문학연구 Vol.32 No.-
Referring to the data from the current confirmed books for popular folk songs, they seem to decline the popularity since 1920s. However, after expanding of the study subjects to the publishing lists that did not belong to the Complete Collections of Korean Folk Songs and phonograph discs, we confirmed the facts that the publications of popular folk song books had been actively publishing in the 1930s, moreover the communication media had been diversified into the discs with the genuine growth of phonograph disc cultures in 1930s. With the diversifications of communication media, that is, the popularity of popular folk songs had been effective in 1930s and grown popularly, continuously. Subsequently, we reviewed the changing features of popular folk songs by the diversifications of communication media, and described the results by the segmentations of sub-branches, changes of popular repertoire, emerging new style of popular folk songs, and diversifications of enjoying patterns. Lastly, we concluded with proposing the needs of expansion of future study subjects for popular folk songs into not only the books and discs, but also the music programs of Kyongsung broadcasting system that had positioned as the important communication media of popular folk songs in 1920~30s.