• 정보관리학회지
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• 제19권1호
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• pp.135-161
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• 2002

과학기술 분류표, 시소러스, 용어사전 등의 주요한 색인 및 검색 도구를 한국어, 영어 일본어의 3개 언어로 통합 구축하여 활용할 수 있도록 다기능, 다국어 과학기술 통합 개념체계의 모형을 설계하였다. 이 연구에서는 개념을 기본 단위로 한 시소러스 모형을 개발하였으며, 시소러스와 연계되는 용어사전 레코드는 ISO 12620 표준에 근거하여 필수요소를 지정하였다. 또한 과학기술분야 표준분류표를 마련하고 기존의 일반 분류표와의 매핑 테이블을 작성하여 다른 분류표를 통한 접근이 가능하도록 하였다. 본 연구에서 개발한 통합 개념체계를 이용하여 원자력 분야를 대상으로 한 프로토타입 시스템을 구축하고 실제 검색 사례를 제시하였다.

• Journal of Power Electronics
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• 제17권2호
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• pp.380-388
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• 2017

Since the carrier sequence is not reproducible in a period of the random carrier pulse width modulation (RCPWM) and a higher harmonic spectrum amplitude is likely to affect the quality of the power supply. In addition, electromagnetic interference (EMI) and mechanical vibration will appear. To solve these problems, this paper has proposed an optimal RCPWM based on a genetic algorithm (GA). In the optimal modulation, the range of the random carrier frequency is taken as a constraint and the reciprocal of the maximum harmonic spectrum amplitude is used as a fitness function to decrease the EMI and mechanical vibration caused by the harmonics concentrated at the carrier frequency and its multiples. Since the problems of the hardware make it difficult to use in practical engineering, this paper has presented a hardware system. Simulations and experiments show that the RCPWM is effective. Studies show that the harmonic spectrum is distributed more uniformly in the frequency domain and that there is no obvious peak in the wave spectra. The proposed method is of great value to research on RCPWM and integrated power systems (IPS).

• 한국재료학회:학술대회논문집
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• 한국재료학회 2009년도 추계학술발표대회
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• pp.4.1-4.1
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• 2009

The dream of futurists andtechnologists is to build complex, multifunctional machines so small that theycan only be seen with the aid of a microscope. The unprecedented technologyadvancements in miniaturizing integrated circuits on semiconductors, and theresulting plethora of sophisticated, low cost electronic devices demonstratethe impact that micro/nano scale engineering can have when applied only to thearea of electrical and computer engineering. Emerging research efforts indeveloping organic and inorganic nano materials together with using micro/nanofabrication techniques for implementing integrated multifunctional devices hopeto yield similar revolutions in other engineering fields. By cross linking theindividual engineering fields through micro/nano technology, various organicand inorganic materials and miniaturized system devices can be developed thatwill have future impacts in the IT and life science applications. Yet to buildthe complex micromachines and nanomachine of the future, engineering will needto develop the technology capable of seamlessly integrating these materials andsubsystems together at the micro and nano scales. The micromachines of thefuture will be “integrated nanosystems,” complex devices requiring the integration of multiple materials,phenomena, technologies, and functions at the same platform. To develop thistechnology will require great efforts in materials science and engineering, infundamental and applied sciences. In this talk, we will first discuss thenature of micro and nanotechnology research for IT and life sciences, and thenintroduce selected current activities in micro and nanotechnology research fororganic and inorganic materials and devices. The newly developed micro/nanofabrication processes and devices, combined with in-depth scientificunderstandings of materials, can lead to rapid development of next generationsystems for applications in IT and life sciences.

• ETRI Journal
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• 제18권4호
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• pp.265-286
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• 1997

This paper presents a new software development environment that supports an integrated methodology for covering all phases of software development and gives integrated methods with tools for ITUT (Telecommunication Standardization Section of the International Telecommunication Union) languages. The design of the environment to improve software productivity and quality is based on five main concepts: 1) formal specifications based on SDL (Specification and Description Language) and MSC (Message Sequence Charts) in the design phase, 2) verification and validation of those designs by tools, 3) automatic code generation and a safe separate compilation scheme based on CHILL (CCITT High-Level Language) to facilitate programming-in-the-many and programming-in-the-large. 4) debugging of distributed real-time concurrent CHILL programs, and 5) simulation of application software for integrated testing on the host machine based on CHILL. The application results of the environment compared with other approaches show that the productivity is increased by 19 % because of decreasing implementation and testing cost, and the quality is increased by 83 % because of the formal specifications with its static and dynamic checking facilities.

• Current Optics and Photonics
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• 제4권3호
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• pp.229-237
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• 2020

In this study, a beam-coupling system is designed to improve the coupling efficiency of achip-integrated spectrometer when the waveguide is arranged in a linear and discrete manner. In the proposed system the beam is shaped to be anti-Gaussian, to deposit adequate energy in the edge waveguides. The beam is discretely coupled to the corresponding waveguide by a microlens array, to improve the coupling efficiency, and is compressed by a toroidal lens to match the linear discrete waveguides. Based on the findings of this study, the coupling efficiency of the spectrometer is shown to increase by a factor of 2.57. Accordingly, this study provides a reference basis for the improvement of the coupling efficiency of other similar spectrometers.

• 한국보건간호학회지
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• 제30권3호
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• pp.445-455
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• 2016

Purpose: This study was performed to identify the effects of an integrated nursing intervention program on the quality of life, depression and self care agency of community dwelling cancer patients. Methods: The design of this study was a quasi-experimental, one group pre-post test. A total of 25 community dwelling cancer patients in J city were included in this study. An integration intervention was 30 times, 10 weeks program. The data were collected between May and November of 2014. The collected data were analyzed using SPSS 18.0 through paired t-test. Results: There were significant differences in the quality of life (p=.007) and self-care agency (p=.042) after 10 week's intervention. Conclusion: The results indicate that an integrated intervention program including educational, cognitive, emotional and physical intervention is effective for community dwelling cancer patients. Further attention should be paid to the intensity and period of an integrated intervention program.

• 한국학교수학회논문집
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• 제17권4호
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• pp.629-656
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• 2014

이 연구는 수학과 과학, 특히 생명과학과의 연결성에 기초하여 미적분과 통계 기본 교과의 확률의 뜻과 활용 단원을 생명과학I의 유전 내용과 통합하여 지도하는 교수-학습 자료를 개발하고 개발된 교수-학습 자료를 실제 수업에 적용하여 수업에 참여한 고등학생들이 드러내는 특징을 분석함으로써 그 교수학적 시사점을 기술하는데 목적을 두었다. 선행연구 분석을 통해 통합 교수-학습 자료 개발을 위한 세부 관점을 상세화하고 생명과학 교과서와 수학 교과서를 분석하여 연계 가능한 내용을 추출한 다음 이를 실제 교수-학습 자료로 조직하였다. 이를 활용한 수업에서 학생들이 보이는 특징을 4가지로 요약하여 제시함으로써 수학과 과학 통합교육의 설계와 실행에 있어 몇 가지 시사점을 제안하였다.

• 한국콘텐츠학회논문지
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• 제20권2호
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• pp.689-699
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• 2020

국내외 학술논문을 서비스하는 국가과학기술정보센터(NDSL) 데이터베이스는 다양한 정보원으로부터 수집된 데이터가 분산적으로 수집, 구축 및 관리되고 있다. 본 연구에서는 분산된 학술논문 DB를 분석하여 논문데이터를 고부가가치화하고 효율적으로 관리할 수 있는 통합 DB 스키마 도출을 위하여 현재 구축되고 관리되는 학술논문 DB 스키마 및 DB 메타데이터를 분석하였다. 또한, 현재 구매하여 보유하고 있는 Web of Science와 SCOPUS 스키마를 활용하여 비교, 분석을 통한 최종 학술정보 데이터 항목을 정하였다. 본 연구를 통하여 구축되고 서비스되는 학술정보 데이터 항목이 논문, 저자, 초록, 기관, 주제, 저널, 참고문헌 7가지로 요약 도출되었으며 구축중인 핵심콘텐츠로 정의하였다. 본 연구를 통하여 통합 DB 스키마가 만들어졌으며, 향후 이 연구 결과는 고품질의 학술논문 통합 DB 컬렉션 구성과 시스템 최적화 설계를 위한 기반 자료로 활용하고자 한다.

• Bulletin of the Korean Chemical Society
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• 제24권4호
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• pp.467-472
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• 2003

Optically pure α-mono- and α, α-disubstituted β-amino acids were conveniently prepared in four steps and in 27-40% overall yields from the correspondingly substituted racemic β-hydroxy acids that can be readily obtained from diethyl malonate. In the synthesis, (S)-phenylethylamine has been used as a resolving agent and as a source of the amino group in the β-amino acids.

• Macromolecular Research
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• 제9권1호
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• pp.1-19
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• 2001

Poly(p-phenylene pyromellitimide) and poly(4,4'-biphenylene pyromellitimide) are representatives of fully rod-like polyimides. Their structure and properties in thin films are reviewed. The polymers exhibit some excellent properties such as high molecular packing coefficient, high mechanical modulus, and low thermal expansion coefficient, and low interfacial stress, so that they are very attractive to both industry and academia. However, these polymers are very brittle and thus practically useless. Some chemical modifications to improve such drawback with a little sacrifice of the high modulus are described: i) incorporation of short side groups into the polymer backbone and ii) insertion of proper linkages into the polymer backbone.