• 한국지능시스템학회논문지
• /
• 제16권6호
• /
• pp.659-664
• /
• 2006

최근 유비쿼터스 컴퓨팅 환경에서 핵심적인 요소 기술인 상황 인식 시스템을 실현하기 위해 필요한 상황 정보를 수집하는데 점차 센서의 활용과 응용분야가 확대되고 있다. 상황 인식 서비스는 센서로부터 수집된 상황 정보를 통합하고 해석 및 추론 과정을 거쳐 사용자에게 상황에 따라 적절한 서비스를 제공하는 것으로 매장, 의료, 교육 등의 응용분야에서 많이 연구되고 있다. 본 논문에서는 다치 함수의 차분 및 구조적 성질을 이용하여 주변 상황 등을 인식하는 방법과 그 인식 결과를 해석하여 주변상황의 변화에 따른 적절한 서비스를 제공할 수 있는 모델을 제안하고 적용 예를 통하여 확인한다.

• 한국정보통신학회논문지
• /
• 제11권12호
• /
• pp.2205-2209
• /
• 2007

본 논문에서는 무선가입자회선망 시스템의 핵심 부품의 하나인 2.3GHz대역의 WLL(무선가입자 회선망)에 사용하는 전압제어발진기를 설계하였다. 발진기의 형태는 콜핏츠 방식을 채 택하였으며, 발진소자로는 LC공진기를 사용하여 유전율이 4.6인 FR-4 기판위에 실장을 하여 제작하였다. 설계된 전압 제어 발진기는 3.2V, 10mA에서 동작하고 출력은 0.67dBm, 위상잡음 특성은 100kHz 옵셋 주파수에서 -102dBc/Hz이고 동조대역폭은 1V-3V의 전압변화에 $2200{\sim}2240MHz$까지 40MHz의 동조 대역폭을 얻을 수 있었다. 제작된 전압제어발진기는 설계 목표치와 비슷한 결과를 얻을 수 있었으며, 무선가입자 회선망에 적용할 수 있다.

• Journal of Industrial and Engineering Chemistry
• /
• 제68권
• /
• pp.153-160
• /
• 2018

An environmentally favorable (chlorine-free) solid oxidizer, guanidinium dinitramide [GDN; $NH_2C(NH_2)NH_2N(NO_2)_2$], was newly synthesized from guanidine carbonate [$NH_2C(=NH)NH_2{\cdot}1/2H_2CO_3$]. Two different crystalline forms (${\alpha}-type$ and ${\beta}-type$) appeared according to the applied solvents and synthesis conditions. Moisture, during extraction, might become trapped in a crystal between inner molecules. Therefore, despite having the same chemical composition, Raman-IR and TGA-DSC revealed different physical characteristics of the two forms. Peaks of Raman shift near $1000cm^{-1}$ implied different chemical structures. Thermal analysis revealed an exothermic temperature $155.7^{\circ}C$ for ${\alpha}-type$ but one of $191.6^{\circ}C$ for ${\beta}-type$. The caloric value of ${\alpha}-type$ was 536.4 J/g, which was 2.5 times larger than that of the ${\beta}-type$, which was 1310 J/g. While the synthesized GDN of ${\alpha}-type$ showed a steep exothermic decomposition, the ${\beta}-type$ was slowly decomposed after melting through an endothermic process. This work implied that despite of the same molecular formula some different core thermal properties would appear depending on synthesis conditions.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2009년도 추계학술대회
• /
• pp.924-927
• /
• 2009

IT-SoC의 성능 향상과 개발기간 단축을 위한 IP 재사용 (reuse) 기술은 SoC 산업이 본격적으로 성장하기 위한 필수 요소이다. 이러한 IP 기술은 수요기업의 요구에 부응하는 적합한 사양을 결정하고 표준화 하는 일이 매우 중요하며, 무엇보다도 수입에 의존하지 않는 국산 기술의 개발이 중요하다. 본 고에서는 반도체 설계의 지식재산권화의 필요성과 그 재사용에 대한 중요성에 대하여 분석하고 논의한다. 특별히, 미국의 CAST 사에서 수입하여 사용하고 있는 암호화 IP를 예를 들어 문제점을 분석한다.

• 산업경영시스템학회지
• /
• 제44권3호
• /
• pp.125-132
• /
• 2021

In this study, the improvement of the IP system, which is the core infrastructure of the MRO project, and its effect were analyzed. Systematic problems and problems that are not competitive in the actual operating environment were systematically derived, and based on this, the most suitable method for target system development was found and improved. And the data of the improved system was analyzed and the effect was verified through empirical analysis of the system improvement effect through the user questionnaire. As a result of the study, the item with the highest improvement effect was convenience, which increased by 12.43 points. Then it increased by 10.25 points in terms of features. In particular, you will notice a significant improvement in speed by 30-50%. This is because the empirical analysis results are more objective and realistic than other conceptual models. Also, from the practical point of view, based on the results of the empirical analysis, corporate management can more effectively promote the intellectual property system, which is expected to contribute to the enhancement of corporate competitiveness.

• 비교문화연구
• /
• 제35권
• /
• pp.35-58
• /
• 2014

This article aims to explain the 'people-image' of Bakhtin's works in the light of "Transgredience" and "Transition." According to Bakhtin, the real core of every culture is the people. But he did try to answer the question "what is the people?" I think, the secret of Bakhtinian thought is located in the people-image, because it is the one of the territories that have not been explained. For this purpose, we have to examine four images represented by Bakhtin, - rogue, clown, fool, thief. These images are the concrete and individualized images of people, who can characterize the power of transgredience and transition. They commonly act for changing ordinary borders of identities formulated with nationality, property, status, classes, sex and so forth. In this sense, Bakhtin thinks that the masks are the real nature which can show the mutational power of Being. That is the kernel of Bakhtin's people-image that makes and changes every cultural world. When we accept and practise this perspective positively, we will realize that Bakhtin's position is close to the cultural politics, because a practical power of thought cannot help but being political. That's why we have to investigate Bakhtin's people-image from a vantage point of "Transgredience" and "Transition."

• Steel and Composite Structures
• /
• 제32권1호
• /
• pp.59-66
• /
• 2019

Hollow steel-reinforced concrete-filled GFRP tubular member is a new kind of composite members. Firstly set the mold in the GFRP tube (non-bearing component), then set the longitudinal reinforcements with stirrups (steel reinforcement cage) between the GFRP tube and the mold, and filled the concrete between them. Through the axial compression test of the hollow steel-reinforced concrete-filled GFRP tubular member, the working mechanism and failure modes of composite members were obtained. Based on the experiment, when the load reached the ranges of $55-70%P_u$ ($P_u-ultimate$ load), white cracks appeared on the surface of the GFRP tubes of specimens. At that time, the confinement effects of the GFRP tubes on core concrete were obvious. Keep loading, the ranges of white cracks were expanding, and the confinement effects increased proportionally. In addition, the damages of specimens, which were accompanied with great noise, were marked by fiber breaking and resin cracking on the surface of GFRP tubes, also accompanied with concrete crushing. The bearing capacity of the axially compressed components increased with the increase of reinforcement ratio, and decreased with the increase of hollow ratio. When the reinforcement ratio was increased from 0 to 4.30%, the bearing capacity was increased by about 23%. When the diameter of hollow part was decreased from 55mm to 0, the bearing capacity was increased by about 32%.

• Journal of Information Processing Systems
• /
• 제15권2호
• /
• pp.374-385
• /
• 2019

This paper presents an optimal implementation of a Daubechies-based pipelined discrete wavelet packet transform (DWPT) processor using finite impulse response (FIR) filter banks. The feed-forward pipelined (FFP) architecture is exploited for implementation of the DWPT on the field-programmable gate array (FPGA). The proposed DWPT is based on an efficient transpose form structure, thereby reducing its computational complexity by half of the system. Moreover, the efficiency of the design is further improved by using a canonical-signed digit-based binary expression (CSDBE) and advanced functional sharing (AFS) methods. In this work, the AFS technique is proposed to optimize the convolution of FIR filter banks for DWPT decomposition, which reduces the hardware resource utilization by not requiring any embedded digital signal processing (DSP) blocks. The proposed AFS and CSDBE-based DWPT system is embedded on the Virtex-7 FPGA board for testing. The proposed design is implemented as an intellectual property (IP) logic core that can easily be integrated into DSP systems for sub-band analysis. The achieved results conclude that the proposed method is very efficient in improving hardware resource utilization while maintaining accuracy of the result of DWPT.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 추계학술대회
• /
• pp.227-229
• /
• 2016

무인 항공기는 공중을 비행한다는 특성에 따라 추락할 경우 항공기뿐만 아니라 인명 및 재산피해를 동반할 가능성이 발생한다는 점에서 어떠한 환경에서도 정확한 제어가 가능한 하드웨어의 높은 신뢰성이 요구된다. 현재 무인 항공기 제어의 핵심은 비행 간 여러 외부 환경 변화 속에서도 기체의 중심을 잡아 불안정한 비행 및 추락을 방지하는 것이다. 본 연구는 무인항공기의 안정적인 비행을 돕는 하나의 관성 측정 장치를 이용한 기체의 중심을 잡는 기존 방식을 보완하여, 한 방향으로 장착되는 관성 측정장치를 역방향으로 장착하여, 두 개의 관성 측정 장치의 무인 항공기 기체가 가지는 가속도 3축, 자이로 3축에 대한 총 여섯 가지 센서 값을 이중으로 처리하는 시스템을 설계하여 무인 항공기의 주추락 원인 중 하나인 관성 측정 장치의 고장이나 전달되는 값의 오류로 인한 추락을 미연에 방지한다.

• 한국약용작물학회지
• /
• 제27권2호
• /
• pp.75-85
• /
• 2019

Background: Medicinal plants are widely used in Asia. They have proven to be an invaluable asset in modern drug discovery and their demand has been steadily increasing across various industries. Methods and Results: Using 4,867 valid patents related to 12 oriental medicinal plants of 10 country groups, the growth and development potential of patents was evaluated. The cites per patent (CPP) and patent family size (PFS) indices were used to evaluate the market capability and technological level of the collected patents. Meanwhile, the patent impact index (PII) and technology strength (TS) were used to compare the technological competitiveness of patents among various technology types and markets. Both CPP and PFS indices showed that magnolia-vine and balloon flower have numerous core or original patents. Furthermore, an increase in both PII and TS indices was observed. A newly designed intellectual property multi-layer (IPM) model predicted that the medicine, genome and cosmetic categories have a high possibility of patent application growth. Conclusions: The IPM model can be used to provide the scope of particular technology fields for patent development. In addition, this study can assist patents to advance in the international market and guide the development of a national industrial strategy.