• 한국식품과학회지
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• 제21권4호
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• pp.486-491
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• 1989

단립종인 천마벼, 중립종인 용문벼, 장립종인 Mahatma등 3품종 설에 대한 취반미의 텍스쳐 특성과 아밀로오스의 분자량 분포를 rheometer와 겔 크로마토그래피 방법을 통하여 연구하였다. Mahana 품종 쌀로 만든 밥은 천마벼나 용문벼로 만든 밥보다 경도가 컸고 부착성이 낮았다. 가용성 아밀로오스는 경도와 정의 상관관계가 있었으나 총 아밀로오스 함량이나 불용성 아밀로오스 함량과는 뚜렷한 상관관계를 보이지 않았다. 분리한 아밀로오스의 ${\beta}-amylolysis$ limit는 $77.2{\sim}78.5%$였으며 iodine binding capacity는 $16.5{\sim}18.2%$였다. 겔 크로마토그래피에 의하여 분리한 아밀로오스의 분자량 분포는 천마벼, 용문벼, Mahatma의 순으로 컸다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권5호
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• pp.1682-1701
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• 2015

In this paper, we propose an intergraded unified imperfect CSI model and investigate the joined effects of feedback delay and channel estimation errors (CEE) for two-hop relaying systems with transmit beamforming and relay selection. We derived closed-form expressions for important performance measures including the exact analysis and lower bounds of outage probability as well as error performance. The ergodic capacity is also included with closed-form results. Furthermore, diversity and coding gains based on the asymptotic analysis at high SNRs are also presented, which are simple and concise and provide new analytical insights into the corresponding power allocation scheme. The analysis indicates that delay effect results in the coding gain loss and the diversity order loss, while CEE will merely cause the coding gain loss. Numerical results verify the theoretical analysis and illustrate the system is more sensitive to transmit beamforming delay compared with relay selection delay and also verify the superiority of optimum power allocation. We further investigate the outage loss due to the CEE and feedback delays, which indicates that the effect of the CEE is more influential at low-to-medium SNR, and then it will hand over the dominate role to the feedback delay.

• Journal of Microbiology and Biotechnology
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• 제15권3호
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• pp.472-476
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• 2005

The present study was untaken to assess the capacity of Bacillus pumilis KHS-1 to grow on chicken flour and to prepare feather digest as fertilizer. To increase keratinolytic activity, the addition of cysteine (5.0 mM) showed the highest keratinolytic activity (245 unit) among the reducing agents tested. The production of soluble protein (feather digests) paralleled the tendency to the production of keratinolytic protease. In the growth curve of B. pumilis KHS-1 at $30^{\circ}C$ in the feather medium with 5 mM cysteine, the maximum keratinolytic activity of B. pumilis was about 161 units/ml after 84 h of incubation. The maximum enzyme activities were observed at the late logarithmic growth phase, and remained thereafter with little changes. Using 27-day plant growth assays on carrot and Chinese cabbage, feather digests and reference fertilizer were compared. In terms of the length and the weight of the above-ground vegetations, feather digests showed the same effect as that of the fertilizer. Therefore, our investigation shows that the feather digests can be used in agriculture.

• 한국산업정보학회논문지
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• 제21권3호
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• pp.7-12
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• 2016

인터넷의 적대적인 환경에서 보안성을 향상시키기 위해 스테가노그래피는 커버 매체 내부에 비밀 메시지를 숨기는데 초점을 두고 있다. 즉 암호화의 보완이다. 이 논문에서 한글을 이용한 텍스트 스테가노그래피 기법을 제안한다. 보안 수준을 높이기 위해 비밀 메시지는 유전 알고리즘 연산자 교차를 통해 암호화한다. 커버 매체의 특성과 구조 변화가 없는 스테고 텍스트 형태를 만들기 위한 커버 텍스트로 메시지를 삽입한다. 커버 매체에 3.69% 삽입 용량을 유지하기 위해, 스테고 텍스트의 크기가 14%로 증가되는 것을 확인할 수 있다.

• 대한안전경영과학회지
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• 제16권4호
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• pp.295-303
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• 2014

In this paper, due to the instability of the domestic market, global competition is intensifying in the current situation of global capacity building of SMEs for the purpose of developing a diagnostic indicator placed on the purpose. In this model, the results of applying several companies overall global innovation pilot enterprises and non-rated global innovative companies awarded significant difference between the score and the ability to believe the show. Non-global innovation companies, the relative firm size factor and R&D investment and patent number of factors are lacking appeared shone This is a common small business nature of the majority of companies small and R&D investment, the absolute amount is insufficient to reflect that, but the global innovator in the case of firm size and the relatively large amount of investment that never shows.

• 디지털융복합연구
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• 제11권3호
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• pp.59-71
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• 2013

클라우드 서비스(아마존 웹서비스 등)를 활용하여 글로벌 경쟁력을 갖춘 중소업체의 온라인 서비스(예. Zynga, 파프리카랩)가 등장하거나 금융시장 분석서비스가 클라우드를 활용하는 등 클라우드의 활용도가 높아지고 있으나, 국내 중소기업의 클라우드 이용은 아직 낮은 수준에 머물고 있다. 특히, PaaS(플랫폼 클라우드)가 성장하면서 모듈화된 인터넷 도구를 손쉽게 활용하여 비즈니스를 개발하는 행태가 증가할 것으로 전망되는 만큼, 국내기업의 IT부문 경쟁력 제고를 위하여 국내외 도입 성공사례를 연구하였다.

• 전자공학회논문지
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• 제52권6호
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• pp.10-14
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• 2015

홀로그래픽 데이터 저장장치는 매질의 체적에 데이터를 저장하고 CCD를 사용하여 2차원 픽셀의 이미지로써 데이터를 처리하기 때문에 빠른 데이터 전송률과 저장 용량을 현저히 증가시킬 수 있다. 하지만 홀로그래픽 저장장치는 기존의 저장장치들과는 다른 오류 요인인 2차원 인접심볼간 간섭이 발생한다. 본 논문에서는 홀로그래픽 데이터 저장장치에서 읽은 데이터가 검출기를 통과하기 전에 전처리과정을 통하여 인접심볼간 간섭을 줄이는 방법을 제안한다. 이 방법은 어긋남을 보정하기 위한 전처리과정과 변조부호방법을 결합하여 사용할 수도 있다는 장점이 있다.

• Journal of Communications and Networks
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• 제11권4호
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• pp.375-383
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• 2009

The WiMedia alliance has specified a distributed medium access control (WiMedia MAC) protocol based on ultra wideband (UWB) for high data rate WPANs (HR-WPANs). The merits of WiMedia MAC such as distributed nature and high data rate make it a favorite candidate in HR-WPAN. Although QoS parameters such as the range of service rates are provided to a traffic stream, the WiMedia MAC is not able to use the QoS parameters and to determine or adjust a service rate using the QoS parameters for the traffic stream. In this paper, we propose a fair and adaptive resource allocation method that allocates time slots to isochronous streams according to QoS parameters and the current traffic load condition in a fully distributed manner. Although the traffic load condition changes, each device independently recognizes the changes and calculates fair and maximum allowable service rates for traffic streams. From the numerical and simulation results, it is proved that the proposed method achieves high capacity of traffic streams and fair QoS provisioning under various traffic load condition.

• Structural Engineering and Mechanics
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• 제53권1호
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• pp.17-26
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• 2015

The cross sections of hollow cylindrical tubes ovalise under a pure bending condition, and this reduces their flexural stiffness as their curvatures increase. It is important to accurately evaluate this phenomenon, known as the 'Brazier effect', to understand the bending behaviour of the systems considered. However, if the tubes are supported by an elastic medium or foundation, the ovalisation displacements of their cross sections may decrease. From this point of view, the purpose of this research is to analytically investigate the bending characteristics of single- and double-walled elastic tubes contacted by an elastic material by considering the Brazier effect. The Brazier moment, which is the maximum moment-carrying capacity of the ovalised cross section, can be calculated by introducing the strain energy per unit length of the tube in terms of the degree of ovalisation for the tube and the curvature. The total strain energy of the double-walled system is the sum of the strain energies of the outer and inner tubes and that of the compliant core. Results are comparatively presented to show the variation in the degree of ovalisation and the Brazier moment for single- and double-walled tubes.

• Structural Engineering and Mechanics
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• 제33권6호
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• pp.725-745
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• 2009

In this paper, probabilistic seismic performance assessment of a typical non-seismic RC frame building representative of a large inventory of existing buildings in developing countries is conducted. Nonlinear time-history analyses of the sample building are performed with 20 large-magnitude medium distance ground motions scaled to different levels of intensity represented by peak ground acceleration and 5% damped elastic spectral acceleration at the first mode period of the building. The hysteretic model used in the analyses accommodates stiffness degradation, ductility-based strength decay, hysteretic energy-based strength decay and pinching due to gap opening and closing. The maximum inter story drift ratios obtained from the time-history analyses are plotted against the ground motion intensities. A method is defined for obtaining the yielding and collapse capacity of the analyzed structure using these curves. The fragility curves for yielding and collapse damage levels are developed by statistically interpreting the results of the time-history analyses. Hazard-survival curves are generated by changing the horizontal axis of the fragility curves from ground motion intensities to their annual probability of exceedance using the log-log linear ground motion hazard model. The results express at a glance the probabilities of yielding and collapse against various levels of ground motion intensities.