• 산업경영시스템학회지
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• 제44권4호
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• pp.32-42
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• 2021

The printing process can have to print various colors with a limited capacity of printing facility such as ink containers that are needed cleaning to change color. In each container, cleaning time exists to assign corresponding inks, and it is considered as the setup cost required to reduce the increasing productivity. The existing manual method, which is based on the worker's experience or intuition, is difficult to respond to the diversification of color requirements, mathematical modeling and algorithms are suggested for efficient scheduling. In this study, we propose a new type of scheduling problem for the printing process. First, we suggest a mathematical model that optimizes the color assignment and scheduling. Although the suggested model guarantees global optimality, it needs a lot of computational time to solve. Thus, we decompose the original problem into sequencing orders and allocating ink problems. An approximate function is used to compute the job scheduling, and local search heuristic based on 2-opt algorithm is suggested for reducing computational time. In order to verify the effectiveness of our method, we compared the algorithms' performance. The results show that the suggested decomposition structure can find acceptable solutions within a reasonable time. Also, we present schematized results for field application.

• 융합정보논문지
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• 제12권1호
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• pp.1-6
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• 2022

증강현실 기술이 보편화됨에 따라 마커 기반형 AR 콘텐츠들이 다양하게 적용되고 있지만, 마커 인식이 정상적으로 이루어지지 않아 콘텐츠 활용성이 저하되는 문제점이 있다. 본 논문은 증강현실 마커 이미지의 인식률을 높이고자, 이미지 보정 및 디자인 변화를 적용하였을 경우 마커의 인식률이 어느 정도 향상될 수 있는지를 실험을 통하여 분석하였다. 실험결과 이미지 보정 과정에서는 원본 마커 이미지의 대비, 채도값을 높였을 때 특징점이 더 많이 판별되었으며, 인식등급 또한 향상된 것을 확인할 수 있었다. 게다가 원본 마커 이미지에 규칙적인 패턴 디자인을 추가하였을 때에도 인식률이 향상된 것을 알 수 있었다. 결론적으로 마커 이미지를 제작하는 과정에서 이미지의 적절한 보정 및 패턴 디자인의 추가과정을 통하여 마커가 잘 인식되도록 할 수 있었다.

• 산업경영시스템학회지
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• 제44권4호
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• pp.65-75
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• 2021

This study explores multiple variables of an OTT service for discovering hidden relationship between rating and the other variables of each successful and failed content, respectively. In order to extract key variables that are strongly correlated to the rating across the contents, this work analyzes 170 Netflix original dramas and 419 movies. These contents are classified as success and failure by using the rating site IMDb, respectively. The correlation between the contents, which are classified via rating, and variables such as violence, lewdness and running time are analyzed to determine whether a certain variable appears or not in each successful and failure content. This study employs a regression analysis to discover correlations across the variables as a main analysis method. Since the correlation between independent variables should be low, check multicollinearity and select the variable. Cook's distance is used to detect and remove outliers. To improve the accuracy of the model, a variable selection based on AIC(Akaike Information Criterion) is performed. Finally, the basic assumptions of regression analysis are identified by residual diagnosis and Dubin Watson test. According to the whole analysis process, it is concluded that the more director awards exist and the less immatatable tend to be successful in movies. On the contrary, lower fear tend to be failure in movies. In case of dramas, there are close correlations between failure dramas and lower violence, higher fear, higher drugs.

• 한국해양공학회지
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• 제35권6호
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• pp.446-456
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• 2021

To build an environment facility of a large-scale ocean basin, various detailed reviews are required, but it is difficult to find data that introduces the related research or construction processes on the environment facility. The current generator facility for offshore structure safety evaluation tests should be implemented by rotating the water of the basin. However, when the water in the large basin rotates, relatively large flow irregularities may occur and the uniformity may not be adequate. In this paper, design and review were conducted to satisfy the performance goals of the DOEB through computational numerical analysis on the shape of the waterway and the flow straightening devices to form the current in the large tank. Based on this, the head loss, which decreases the flow rate when the large tank water rotates through the water channel, was estimated and used as the pump capacity (impeller) design data. The impeller of the DOEB current generator was designed through computational numerical analysis (CFD) based on the lift surface theory from the axial-type impeller shape for satisfying the head loss of the waterway and maximum current velocity. In order to confirm the performance of the designed impeller system, the flow rate and flow velocity performance were checked through factory test operation. And, after installing DOEB, the current flow rate and velocity performance were reviewed compare with the original design target values. Finally, by measuring the current velocity of the test area in DOEB formed through the current generator, the spatial current distribution characteristics in the test area were analyzed. Through the analysis of the current distribution characteristics of the DOEB test area, it was confirmed that the realization of the maximum current velocity and the average flow velocity distribution, the main performance goals in the waterway design process, were satisfied.

• 한국콘텐츠학회논문지
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• 제22권4호
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• pp.714-726
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• 2022

본 논문의 목적은 만정제 <춘향가>에 나타난 한시 어구의 활용 방식과 그 음악적 특징을 규명하는데 있다. 이를 위해 사설에 활용된 한시 어구들의 역할을 풍경 묘사, 즐거운 감정의 심화, 슬픈 감정의 심화, 언어의 유희, 여러 시의 재구 등 다섯 가지의 패턴으로 분류하고, 이에 대한 음악적 분석을 시도하였다, 분석 결과, 슬픈 감정의 심화를 위한 한시 차용이 가장 많은 가운데, 슬픈 대목에 차용된 한시 어구들은 진양조, 중모리의 느린 장단과 계면길, 진계면성음의 애조 띤 선율로 구성됨으로써 장단과 선율이 모두 이면에 부합하게 표현되고 있는 반면, 풍경묘사 대목은 선율이, 즐거운 심정·언어유희 대목은 장단이 분위기를 좌우하는 특징을 보였다. 또 분석결과를 작창의 관점에 적용해볼 때, 보다 예술성 있는 판소리를 창작하기 위해서는 청중의 주의를 환기할 수 있는 참신한 텍스트의 발굴과 사설에의 적용, 이면에 맞는 음악적 구현 방법 등을 깊이 연구할 필요가 있다.

• 한국콘텐츠학회논문지
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• 제21권12호
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• pp.322-330
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• 2021

수산 양식장에서 어류 질병을 초기에 발견하지 못하는 경우 밀폐된 공간 안에서 확산하기 때문에 집단 폐사로 이어질 확률이 매우 높다. 이런 이유로 질병의 조기 발견은 양식업에서 매우 중요하다. 양식장에서 질병의 확산을 막기 위해서는 초기에 병이 든 어류를 자동식별이 가능한 방법이 필요하다. 최근 딥러닝 기반의 어류 질병 자동식별 방법이 많이 사용되고 있는데, 어류의 질병 이미지가 충분하지 않아 객체 식별에 많은 어려움이 있다. 본 논문은 질병 자동식별 예측을 위한 질병 이미지의 부족 문제를 해결하기 위해서 SinGAN 딥러닝 모델을 이용하여 정상 이미지와 질병 이미지를 합성해 다양한 어류 질병 이미지를 자동 생성하는 방법을 제안한다. 넙치에서 가장 빈번히 발생하는 3가지 질병 스쿠티카병, 비브리오증, 림포시스티스에 대해서 SinGAN 기반으로 질병 이미지를 증강한다. 본 연구에서는 넙치 정상 이미지 11장에 각 질병 패턴 10가지를 합성하여서 스쿠티카병 110장, 비브리오증 110장, 림포시스티스 110장으로 총 330장을 만들었고 이를 통해 생성된 이미지는 4배수 하여 1,320장의 이미지를 생성할 수 있었다.

• 건축역사연구
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• 제31권5호
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• pp.35-44
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• 2022

Although Changgyeong-gung was devastgated by Japanease invasion in 1592, it was restored during the reign of Gwanghaegun, had remembered of early Joseon danasty's architecturural order. It was destroyed several times by fire after that but was rebuilt immedieately. There are Donggol-do and Donggol-dohyeong, so we can fine the change of architectures in Changgyeong-gung. Jibbokheon(集福軒) and Yeongchunheon(迎春軒) are marked in another location and architectures in Donggon-do and Donggon-dohyeong. The reason has been known that it was rebuilt after the fire in 1830. As a result of reviewing the record of birth of crown prince Sado and movement of coffin of King Jeong-jo in funeral ceremony, it was confirmed that notation of Jibbokheon and Yeongchunhyeon was misprinted. In particular, Yeongchunheon confirmed the possibility that the existing building was built by extending it while applying the asymmetrical building with four-purlins structure method during the reign of King Jeongjo, and that it was reconstructed by moving Yeonyeonghap when it was destroyed by fire 1830. And although now Jibbokheon and Yeongchunhyeon(延英閤) are connected, nothern part of Jibbokheon did not burn in the fire, so it was judged that original architectural plan were maintained until now. The current building north of Jibbokheon was built before 1695 (21st year of King Sukjong), which was first identified in the Gunggeolji(宮闕志), and there is a possibility that it may have been a part of Janggyeongmun(長慶門) inner corridor built before 1633. The present building north of Jibbokheon has great architectural significance in that it maintains the structural method of the early Joseon Dynasty which was often applied to buildings with a small scale of inner palace.

• Journal of Korea Trade
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• 제24권6호
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• pp.157-172
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• 2020

Purpose - This research empirically proves the extent to which export insurance promotes Korean exports to research object countries among New Southern countries. The outcome of this research will present implications for the operations of export insurance for exports to these countries. Design/methodology - For the empirical analysis, the export equation was composed using a basic gravity model. Based on this, the determinants of Korea's exports to research object countries were analyzed. In this study, a panel unit root test and panel cointegration test were conducted. As a result of the panel unit root test, it was confirmed that the variables of the panel data are not belonging to I(0), but to I(1). As a result of the panel cointegration test, it was established that there are long-term stable relationships among all variables. Accordingly, the gravity model was estimated using original data in order to reduce the information loss caused by the first difference, in spite of individual data belonging to I(1). Findings - For the estimated results of panel OLS, the estimated coefficient of short-term export insurance was 0.56-0.64, with statistically significant results at the significance level of 1%. In addition, for the analysis results of the random effect model, the estimated coefficient of short-term export insurance was 0.59-0.64%, with a statistically significant result at the 1% significance level. This could indicate that Korean export insurance has positive influences on export promotion to New Southern countries. Originality/value - The research implies that export insurance has a 4.1 to 4.7 multiplier effect in expanding exports to the New Southern countries for Korea. This research has intensively analyzed the effects of export insurance on the promotion of exports to a selected area by a government foreign economic policy, which is the originality and value of this paper.

• 한국시뮬레이션학회논문지
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• 제30권4호
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• pp.21-29
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• 2021

역합성개구면레이다(ISAR) 영상은 표적의 주요 산란 부위를 보여주는 강력한 도구이다. 표적을 식별 및 분류하는데 주로 사용된다. ISAR 영상의 산란점 정보를 찾는 것은 표적 특징을 모델링하는데 중요하다. 본 논문에서는 ISAR 영상 데이터와 모델링 함수와의 근사오차를 최소화함으로서 산란점 정보를 추출하는 모델링 방법을 제안한다. 여기서 추출된 산란점 정보는 시뮬레이션에서 사용될 표적의 산란점 위치뿐만 아니라 표적 산란점의 오차요소를 고려하는 시뮬레이션에 사용될 수 있는 표적 산란점 위치오차의 통계적 정보도 포함한다. 또한 제안된 방법에 의해서 얻어진 산란점 정보로부터 영상을 재구성하고 원래의 ISAR 영상을 잘 근사하는지 확인하였다.

• 한국산업보건학회지
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• 제32권4호
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• pp.393-401
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• 2022

Objectives: OHSMS, which was introduced by Serious Accident Punishment Act as a means for safety and health management at work place, but it is not effective according to recent statistical data. Therefore, I intend to compare the OHSMS regulations of SAPA based on ISO 45001, the international standard of OHSMS, and examine the differences and problems. Methods: The OHSMS regulation of Serious Accident Punishment Act was compared and analyzed using the content standard of ISO 45001, the international standard of OHSMS. The construction and operation aspects and differences in key concept definitions of OHSMS were analyzed in depth. Results: ISO 45001 aims to provide OHSMS with an autonomous framework to manage risks and opportunities in safety and health management, whereas Serious Accident Punishment Act aims for safety and health management through an interest and effort in safety and health management on the premise of legal responsibilities of corporations and CEO. As a result, comparing to ISO 45001 in construction and operation aspects and differences in key concept definitions of OHSMS, the OHSMS of Serious Accident Punishment Act do not cover the entire business in concept definition and construction. Conclusions: In order for Serious Accident Punishment Act to achieve its original purpose of preventing serious accidents through systemic safety and health management, it is necessary to correctly understand the contents of ISO 45001 and to revise the OHSMS regulations in a direction that can ensure predictability and feasibility.