• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.134.2-134.2
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• 2014

Photonic crystal solar cells have the potential for addressing the disparate length scales in polymer photovoltaic materials, thereby confronting the major challenge in solar cell technology: efficiency. One must achieve simultaneously an efficient absorption of photons with effective carrier extraction. Unfortunately the two processes have opposing requirements. Efficient absorption of light calls for thicker PV active layers whereas carrier transport always benefits from thinner ones, and this dichotomy is at the heart of an efficiency/cost conundrum that has kept solar energy expensive relative to fossil fuels. This dichotomy persists over the entire solar spectrum but increasingly so near a semiconductor's band edge where absorption is weak. We report a 2-D, photonic crystal morphology that enhances the efficiency of organic photovoltaic cells relative to conventional planar cells. The morphology is developed by patterning an organic photoactive bulk heterojunction blend of Poly(3-(2-methyl-2-hexylcarboxylate) thiophene-co-thiophene) and PCBM via PRINT, a nano-embossing method that lends itself to large area fabrication of nanostructures. The photonic crystal cell morphology increases photocurrents generally, and particularly through the excitation of resonant modes near the band edge of the organic PV material. The device performance of the photonic crystal cell showed a nearly doubled increase in efficiency relative to conventional planar cell designs. Photonic crystals can also enhance performance of other optoelectronic devices including organic laser.

• 한국정보처리학회논문지
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• 제6권8호
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• pp.2088-2097
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• 1999

소프트웨어 도메인모형(Domain Model)으로부터 행위패턴을 식별하고, 개발 시스템의 동적 행위를 구체화한 사용 사례추출 및 구조화로 재사용을 증진시키는 소프트웨어 프레임워크(Framework) 구축방법을 제안한다. 대부분의 소프트웨어 행위모형이 이질적인 개발자의 요구사항이나 의도를 일관성 있게 모형화 하지 못하며, 재개발과 유지보수를 위한 구체적인 활용방안이 마련되어 있지 못하다. 따라서, 행위패턴을 식별하고 시스템에 반응하는 구체적인 기능성 항목인 사용 사례(Use Case)를 구조화하여 개발된 모형의 일관성을 보완하고, 재사용과 유지보수를 하는 재사용 프레임워크를 구축한다. 사용 사례의 구조화를 위해 격자모형(Lattice Model)이 이용되며, 재사용 구성항목을 추출하도록 유도할 수 있는 재사용 프로세스 구조와 세부절차를 소개한다.

• 한국IT서비스학회지
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• 제15권1호
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• pp.197-210
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• 2016

With the advent of text analytics, VOC (Voice of Customer) data become an important resource which provides the managers and marketing practitioners with consumer's veiled opinion and requirements. In other words, making relevant use of VOC data potentially improves the customer responsiveness and satisfaction, each of which eventually improves business performance. However, unstructured data set such as customers' complaints in VOC data have seldom used in marketing practices such as predicting service time as an index of service quality. Because the VOC data which contains unstructured data is too complicated form. Also that needs convert unstructured data from structure data which difficult process. Hence, this study aims to propose a prediction model to improve the estimation accuracy of the level of customer satisfaction by combining unstructured from textmining with structured data features in VOC. Also the relationship between the unstructured, structured data and service processing time through the regression analysis. Text mining techniques, sentiment analysis, keyword extraction, classification algorithms, decision tree and multiple regression are considered and compared. For the experiment, we used actual VOC data in a company.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.883-900
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• 2017

In this paper block based blind secure gray image watermarking scheme based on discrete wavelet transform and singular value decomposition is proposed. In devising the proposed scheme, security is given high importance along with other two requirements: robustness and imperceptibility. The use of discrete wavelet transform not only improves robustness but the selection of bands with high tolerance towards noise caused an improvement in terms of imperceptibility. The robustness further improved due to the involvement of singular vectors along with singular values in watermark embedding and extraction process. Finally, to achieve security, the selected DWT band is decomposed into smaller blocks and random blocks are chosen for modification. Furthermore, the elements of left and right singular vectors of selected blocks are chosen based on their dependence upon each other for watermark embedding. Various experiments using different images as host and watermark were conducted to examine and validate the proposed technique. Additionally, the proposed technique is tested against various attacks like compression, affine transformation, cropping, translation, X shearing, scaling, Y shearing, filtering, blurring, different kinds of noises, histogram equalization, rotation, etc. Lastly, the proposed technique is compared with state-of-the-art watermarking techniques and their comparison shows significant improvement of proposed scheme over existing techniques.

• 한국측량학회지
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• 제17권4호
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• pp.349-357
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• 1999

수문 매개변수는 공간적으로 다양하며 여러 가지 축척과 정확도를 가진 지도에 대한 해석을 필요로 한다. 자료 요구는 광범위하며, 자료의 획득과 처리는 시간을 많이 소모한다. 이러한 이유로, 이 연구의 목적은 지형공간정보체계를 이용하여 수문 지형인자 추출시스템을 개발하는 것이다. 수문 지형인자 추출시스템은 수 문 매개변수를 메뉴 방식으로 추출하기 위한 프로그램이다. 이것은 GSIS 프로그램인 Arc/Info에 의해 개발하였다. 유역 유출점을 설정하고 중요한 수문 매개변수를 추출하기 위해 공간분석 기능을 이용하였다. 이 시스템은 수치고도자료를 이용하여 유역경계, 주하천 길이, 유역 평균경사 등과 같은 지형인자를 추출한다.

• 한국산학기술학회논문지
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• 제5권1호
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• pp.13-15
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• 2004

고속처리를 위한 나노급의 논리소자의 개발을 위해서는 소스/드레인 영역의 저항을 감소시키는 것이 필수적이다. 반도체소자의 개발 로드맵을 제시하고 있는 ITRS의 보고에 의하면 70㎚급 MOSFET에서는 채널영역의 저항에 대비하여 그 외의 영역이 나타내는 저항성분이 약 15% 이내로 제작되어야 할 것으로 예측하고 있다. 이 기준을 유지하기 위해서는 소스/드레인 영역의 각 전류 흐름에 기인하는 가상적 기생저항에 대한 성분 분리와 이들이 가지는 저항값에 대한 정량적 계산이 이루어져야 한다. 이에 본 논문은 calibration된 TCAD simulation을 통해 나노영역의 Tr.에서 저항성분을 계산, 평가하는 방법을 연구하였다. 특히, 소스/드레인 영역의 실리사이드 접촉 저항성분들을 최소화하여 optimize하기 위한 전략을 제시한다.

• 대한안전경영과학회지
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• 제15권1호
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• pp.231-239
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• 2013

This intensity is now on a global scale with countless universities across the globe competing for better services, programs and diplomas. For to counteract such a considerable change, in this paper CTQ(Critical to Quality) is extracted for the improvement of the education quality using QFD(Quality Function Development) in college. QFD is a structured approach to seek out voice of customers, understanding their needs, and ensure that their needs are met. First of all, the requirements of the customer are surveyed and analyzed, and then with these results the strategic alternatives are decided. In sequence, the importance and assessment ratings on the requirement of customers are surveyed. Finally, from the relation between the requirement of customers and the strategic alternatives the CTQ is extracted. The derived CTQ is reviewed and analyzed in detail. It'll have major positive effects on the competitiveness of college as well as the education quality of departments.

• International Journal of Knowledge Content Development & Technology
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• 제3권1호
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• pp.81-95
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• 2013

Through a series of precise text handling processes, including automatic extraction of information from documents with knowledge from various fields, recognition of entity names, detection of core topics, analysis of the relations between the extracted information and topics, and automatic inference of new knowledge, the most efficient knowledge base of the relevant field is created, and plans to apply these to the information knowledge management and service are the core requirements necessary for intellectualization of information. In this paper, the knowledge base, which is a necessary core resource and comprehensive technology for intellectualization of science and technology information, is described and the usability of academic information services using it is evaluated. The knowledge base proposed in this article is an amalgamation of information expression and knowledge storage, composed of identifying code systems from terms to documents, by integrating terminologies, word intelligent networks, topic networks, classification systems, and authority data.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 춘계학술대회 논문집
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• pp.306-315
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• 2002

웹의 급속한 성장과 함께 기존의 시스템들이 웹을 기반으로 통합되며, 다양한 시스템들이 개발되고 있다. 일반적인 어플리케이션과는 달리 웹 어플리케이션들은 다양한 기술의 접목으로 개발된다는 점과 본래의 복잡성으로 인해 개발과 관리에 있어 어려움은 더욱 증대된다. 또한 급변하는 비즈니스 환경과 사용자들의 요구사항에 순응하기 위해서는 지속적인 진화가 요구된다. 본 논문에서는 웹 어플리케이션의 구조 정보인 링크 정보를 추출하고, 웹사이트에 대한 유용한 정보를 담고 있는 로그 파일을 분석하여 웹 어플리케이션의 보다 효율적인 개발과 유지보수에 활용하는 방법을 제시한다. 본 논문에서 추출한 정보들은 웹 어플리케이션 테스팅을 위한 기초적인 정보가 될 수 있으며 추출한 정보들을 웹 테스팅에 적용하는 방법을 설명한다. 그리고 링크 정보 추출과 웹 로그 분석을 수행하기 위해 개발된 시스템에 대해 기술한다.

• 한국컴퓨터정보학회논문지
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• 제23권2호
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• pp.71-75
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• 2018

In this paper, we propose an optimized size for paramedic helmets as personal safety equipment for emergency medical technician. This identified priorities for advanced loT technologies that need to be attached to paramedic Helmets. Paramedic helmets with advanced technology have been developed others, but they have not been developed for Korea. The products of kinds do not exist in Korea. Based on the average size of Korean men's heads, this derived an optimized size for paramedic helmets. The optical width of this product would be 205 mm. The length would be 265 mm. The height would be 155 mm. The verified that this size meets the requirements of the authorizing certification institution. What paramedic most need in helmets is various kinds of functionality. The communication and information transmission features. In this study, many personal safety equipment for paramedics, including the extraction of an optimal size of strong emergency head-protection helmets to protect the head of the human body on helmets based on an design. We anticipate this result to be a basis for developing an even more sophisticated and functional paramedic helmet than those that currently exist.