• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.501-504
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• 2003

This paper presents a new fractal coding scheme to find more optimal transformation by estimation of the optimal attractor. The conventional fractal coding schemes based on the collage theorem obtain the transformation to minimize the distance between an original image and its collage image. Heavy computation is why the schemes widely adopt the theorem. In other words, the optimal transformation can be obtained after the attractors of all the possible transformations are generated and then compared with an original image. It is clear that this process is not practical. Therefore, we introduce a sub-optimal scheme that provides better transformation than the conventional scheme, relieving the complexity problem in the optimal transformation. In a simple case, the optimal transformation can be obtained considering all the attractors and then our scheme is compared with the optimal. In general cases not to be able to find the optimal, our scheme is also evaluated and compared with the conventional schemes.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.105-109
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• 1996

The calculation of the total power required at the Continuous Extrusion Forming(CONFORM) has been performed by the theoretical analysis of three transformation regions(primary grip length and extrusion grip length, flashing). In this study, that was performed by five transformation regions(biting, upsetting, filling, extruding, flashing)and four transformation regions(biting, upsetting and filling, extruding, flashing) and then results of theoretical analyses were compared with experimental results. Results of analysis by four and five transformation regions than that of three transformation regions in the CONFORM showed in a good agreement with experimental results.

• 한국멀티미디어학회논문지
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• 제7권5호
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• pp.658-667
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• 2004

영상 데이터의 압축을 위하여 영상이 갖고 있는 자기 유사성 (self similarity)을 이용하는 프랙탈 부호화가 활발하게 연구되고 있다. 본 연구에서는 부호화 효능에 있어서 JPEG과 경합이 가능한 적응 직교변환에 의한 LIFS 부호화에 주목하여 적응 직교변환의 연산 과정의 문제점을 지적하고 그 개선법을 제안하였다. 또한 직교변환의 모든 도메인(domain)을 포함하는 축소된 영상 데이터의 구성법을 제안하였다. 그 결과, 부호화 성능의 열화 없이도 부호기(encoder) 및 복호기(decoder)의 산술 연산량이 크게 삭감되었다.

• 융합경영연구
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• 제12권4호
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• pp.51-64
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• 2024

Recent studies have introduced that digital transformation positively impacts firm performance. However, research on the relationship between organizational capabilities or attitudes as antecedents or situational variables for successfully driving digital transformation remains limited. Therefore, this study aims to systematically analyze how dynamic digital capabilities and the mutual relationships between organizational members' digital acceptance influence firm performance throughout the process of driving and achieving digital transformation. Research design, data, and methodology: This study developed the concepts and measurement items for each variable based on prior research. A survey was conducted with 258 companies participating in mini clusters within industrial complexes across the county. The data was analyzed using a structural equation model with the AMOS software package. Results: Based on existing literature, hypotheses were formulated regarding the causal relationships among variables, and analysis was conducted. The results indicate that digital transformation and employees' technological acceptance play a mediating role in the relationship between dynamic digital capabilities and firm performance. Specifically, the organization's dynamic digital capabilities enhance both digital transformation and technological acceptance. Moreover, digital transformation leads to higher firm performance when technological acceptance is high. Conclusions: This study has shown the importance of enhancing dynamic digital capabilities as a prerequisite for driving digital transformation and highlighted the significance of organizational members' perceptions and attitudes toward information technology. Particularly, through detailed causal analysis among the specific items of each variable, insights were gained for both academic and practical applications.

• 한국인터넷방송통신학회논문지
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• 제13권1호
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• pp.63-70
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• 2013

기존 연구에서는 비즈니스 프로세스 프레임워크에서 정보 추출 및 검색을 위해 비즈니스 프로세스 시스템 질의 언어(BPSQL)를 제안했고, 기존 질의(Query)언어를 그대로 사용하기 위해 비즈니스 프로세스 프레임워크 내 각 레이어 정보들을 테이블화했지만, 레이어 정보의 스펙을 가지고 데이터베이스 구축을 수작업하는 단점이 있다. 이런 문제를 해결하기 위해 메타모델 기반의 모델-텍스트 변환기법을 적용하여, 5 레이어의 비즈니스 프로세스 모델 스키마 기반의 구축 자동 방법을 제안한다. 이를 위한 단계절차는 전체 구조와 데이터베이스 스키마의 메타 모델 정의, 모델 변형 규칙 정의 순이다. 통합정보시스템 설계의 메타 모델링을 통한 각 레이어 스펙정의와 전체 레이어 모델정보 테이블 스키마 스펙을 정의하고, 이 두 스펙 정의를 가지고 모델-텍스트 변환기법을 통해 자동으로 전체 시스템이 구축 된다. 이를 통해서 통합정보시스템 구축이 효율적으로 될 수 있다.

• 한국산업정보학회논문지
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• 제27권1호
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• pp.93-109
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• 2022

오늘날 고객과 정보와 서비스를 결합하는 디지털전환은 산업전체의 판도를 바꾸는 새로운 비즈니스 모델이 등장하며, 고객의 가치를 창출하는 핵심 경쟁력으로 제시되었다. 이러한 관점에서 본 연구는 숙박정보를 제공하는 앱서비스 사례를 기반으로 디지털전환이 기업에 미치는 영향력을 분석하여 경쟁우위요인을 도출하하였다. 본 사례연구는 숙박예약서비스 산업에서 디지털전환시운영프로세스에서 사용자의 참여를 확대하고, 그 과정에서 사용자에게 새로운 선호요인을 제안하여 경쟁력을 높일 수 있는 서비스방안을 분석하였다. 분석결과, S사의 5가지 경쟁요인 분석을 통해 운영프로세스 상에서의 고객서비스 가치 모델을 도출하였다. 본 연구 결과는 서비스산업에서 디지털전환 시 기초자료로 활용될 수 있다.

• 대한한의학원전학회지
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• 제32권4호
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• pp.67-90
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• 2019

Objectives : This study aims to summarize Tang Zong-hai's Qi transformation theory of the Six meridians through his book "Shanghanlun Qianzhubuzheng傷寒論淺注補正" where he integrated Western anatomy with the Qi transformation theory of East Asian Medicine to interpret Zhang Zhong Jing's "Shanghanlun(傷寒論)". The objective is to assist clinical application. Methods : Focusing on the contents of disease of the six meridians in the "傷寒論淺注補正", Tang's theories on the function of Zangfu(臟腑), Opening-Closing-Pivot(關闔樞), Inter-communication of Zangfu(臟腑相通), the Twelve Meridians(十二經脈) from his other publication "中西匯通醫經精義" were examined and related to in the process of explaining Qi transformation theory in detail. Results : 1. The Qi transformation function of the Taiyang meridian is related to "膀胱者, 氣化則能出" where the Small Intestine and Bladder inter-communicate. 2. The Qi transformation function of the Yangming meridian is related to the control of dryness and dampness through the Qi transformation of "陽明不從標本, 從乎中." 3. The Qi transformation function of the Shaoyang meridian is related to the Life-Fire function of the Triple Energizer-Gallbladder-Pericardium coalition through "少陽屬腎." 4. The Qi transformation function of the Taiyang meridian refers to the Heart Fire nurturing the Spleen Earth by creating 膏油 through veins. 5. The Qi transformation function of the Shaoyin meridian is related to the controlling of the Nutrient Qi(營氣) and Defense Qi(衛氣) through '心主血脈, 腎主元氣.' 6. The Qi transformation function of the Jueyin meridian is related to the ability of 和風 which results from '陰盡陽生' to harmonize and control the balance of Water Coldness(水冷) and Fire Heat(火熱). Conclusions : Tang's Qi Transformation Theory of the Six Meridians is his key theory explained from the perspective of Qi transformation of disease in the six meridians of "Shanghanlun", closely related to basic theories such as theory of Zang form(臟象學說), Opening-Closing-Pivot(關闔樞), Inter-communication of Zangfu(臟腑相通), the Twelve Meridians(十二經脈) of East Asian Medicine.

• Journal of Welding and Joining
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• 제33권2호
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• pp.1-7
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• 2015

This article describes the basic technical concepts for applying the friction stir welding (FSW) process to titanium and its alloys. Titanium and its alloys are demanding applications of FSW. During FSW, a protective atmosphere is needed at the welding region to prevent the joints from oxidation due to the absorption of interstitial elements (O, N, and H) at high temperature. The process parameters for FSW have great influence on the microstructure and properties of the joints. No phase transformation occurred in CP Ti because FSW was achieved below the ${\beta}$-transus temperature. Therefore, the mechanical properties of the joints with CP Ti were governed by recrystallization and grain refinement. Furthermore, the strong crystallographic texture indicating <0001>//ND formed in the stir zone. On the other hands, the phase transformation occurred in Ti-6Al-4V alloy because the process temperature reached above ${\beta}$-transus temperature. For this reason, the mechanical properties of the joints with Ti-6Al-4V alloy were altered by not only recry stallization and grain refinement but also phase transformation during FSW. Engineers who want to get sound FSW joints with Ti-6Al-4V alloy have to pay attention to the control about process conditions.

• 한국지능시스템학회논문지
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• 제15권3호
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• pp.357-362
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• 2005

Iris recognition system is the one of the most reliable biometries recognition system. An algorithm is proposed to determine the localized iris from the iris image received from iris input camera in client. For the first step, the algorithm determines the center of pupil. For the second step, the algorithm determines the outer boundary of the iris and the pupillary boundary. The localized iris area is transformed into polar coordinates. After performing three times Wavelet transformation, normalization was done using a sigmoid function. The converting binary process performs normalized value of pixel from 0 to 255 to be binary value, and then the converting binary process is compared pairs of two adjacent pixels. The binary code of the iris is transmitted to the server by the network. In the server, the comparing process compares the binary value of presented iris to the reference value in the database. The process of recognition or rejection is dependent on the value of Hamming Distance. After matching the binary value of presented iris with the database stored in the server, the result is transmitted to the client.

• 한국해양공학회지
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• 제37권5호
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• pp.190-197
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• 2023

In the shipbuilding and marine industry, digital transformation activities are promoted primarily by large shipyards. However, bottlenecks are observed across value chains, and digital transformation effects are reducing because of the cost and technical challenges encountered by supplies. In this study, we proposed a win-win cooperation model for large, small, and medium-sized companies using digital transformation based on the characteristics of the shipbuilding and marine industry through case studies. We investigated the digital transformation progress in German and Korean small and medium-sized enterprises (SMEs). In addition, we identified information-sharing methods and management challenges encountered in enterprise resource planning and manufacturing execution systems in the collaboration process of pipes, panels, blocks, etc. of SMEs that are suppliers of a Korean shipyard, and clarified communication by building a platform based on a common format between shipyards and suppliers. Further, we proposed a standard model of a digital transformation system for enhancing the collaboration between large companies and suppliers and proposed a basic plan including strategies to efficiently and effectively build a digital transformation system based on the standard model.