• Journal of Animal Science and Technology
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• 제50권4호
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• pp.519-526
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• 2008

쇠고기는 고품질의 단백질과 함께 비타민과 광물질을 공급해 주지만, 포화지방산과 콜레스테롤 때문에 일부 소비자들은 부정적인 이미지를 지니고 있다. 쇠고기내 과다한 지방, 특히 콜레스테롤,은 사람의 건강과 불가분의 관계를 지니며, 심장병과 고혈압을 비롯한 각종 대사성 질환의 주요 원인이다. 그러나, 한우 쇠고기내 콜레스테롤 함량에 관한 기초자료는 매우 제한되어 있다. 따라서, 본 연구는 한우, 앵거스, 및 화우 교잡종의 등심내 콜레스테롤 함량과 지방산 조성에 대한 비교 자료를 제공하고자, 61두의 한우와 각 15두의 앵거스 및 화우 교잡종 거세우로부터 등심을 채취하여 콜레스테롤 함량과 지방산 조성을 분석하였다. 한우의 등심내 콜레스테롤 함량은 32.36mg/100g 부터 75.42mg/100g까지 개체별로 광범위한 분포를 나타내었으며, 근내지방도가 “1”에서 “8”로 증가함에 따라 콜레스테롤 함량이 평균 42.76±1.41mg/100g에서 51.43±6.12mg/100g으로 증가하였다. 앵거스 거세우의 경우, 근내지방도가 가장 낮은 “Practically devoid”의 경우 56.84 mg/100g, 근내지방도가 가장 높은 “Abundant”의 경우 72.85 mg/100g을 나타내어, 근내지방도가 증가할수록 콜레스테롤 함량이 증가함을 알 수 있었다. 화우 교잡종 거세우의 경우, “Practically devoid”는 69.23mg/100g, “Moderately Abundant”는 78.93 mg/100g을 나타내어 전체적으로 앵거스 거세우와 하였다. 한우, 앵거스 및 화우 교잡종의 등심내 불포화지방산:포화지방산 및 단가불포화지방산:포화지방산의 비율이 각각 1.48, 1.08 및 1.17과 1.41, 1.03 및 1.10을 나타내어, 한우 거세우에서 현저하게(각각 P< 0.0135 및 P<0.0379) 높게 나타났다. 이상의 결과를 종합해 보면, 한우 거세우는 앵거스나 화우 교잡종 거세우 등심에 비하여 콜레스테롤 함량과 포화지방산의 비율이 현저하게 낮은 반면, 불포화지방산의 비율은 유의하게 높았다. 그러나, 향후 이들 육우의 유전적 배경, 사양 조건, 출하월령, 출하두수 및 샘플링 부위 등을 종합적으로 고려한 후속 연구가 필요한 것으로 판단된다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.368-370
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• 2007

AAO(Anodic Aluminum Oxidation) method has been known that it is practically useful for the fabrication of nano-structures and makes it possible to fabricate the highly ordered nano masters on large surface and even on the 2.5 or 3D surface at low cost comparing to the expensive e-beam lithography or the conventional silicon processing. In this study, by using the multi-step anodizing and etching processes, highly ordered nano patterned master with concave shapes was fabricated. By varying the processing parameters, such as initial matter and chemical conditions; electrical and thermal conditions; time scheduling; and so on, the size and the pitch of the nano pattern can be controlled. Consequently, various alumina/aluminum nano structures can be easily available in any size and shape by optimized anodic oxidation in various aqueous acids. The resulting good filled uniform nano molded structure through hot embossing molding process shows the validity of the fabricated nano pattern masters.

• 대한전자공학회논문지
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• 제25권5호
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• pp.566-571
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• 1988

Laser scanning system using a hologram is simpler in optical system, lower in cost than using a polygon. In this paper, a thick hologram is fabricated for the underfilled transmission disk type with a merit of wabble insensitivity to vibration. High diffraction efficiency over 50% is obtained using silver halide recording material. The two-dimensional scan pattern with 13 scan-line is made by 7-facet hologon and mirror system. This system can be practically applied to POS(Point of Sale) bar-code symbol reader.

• 한국통신학회논문지
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• 제25권8A호
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• pp.1213-1222
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• 2000

본 논문에서는 음성 위주의 교환시스템에서 인터넷 트래픽처리를 위한 구현 방안을 제시하였으며 인터넷 트래픽 처리를 담당하는 서비스시스템의 내부 프로세서간 통신망에 대한 성능을 평가 분석하였다 기존 교환시스템에서 인터넷 트래픽을 처리방법은 기존의음성가입자에게 영향을 주며 특히 인터넷 트래픽 속성상 장시간의 점유시간을 가지게 된다 이러한 문제점을 해결하기 위해 인터넷 트래픽 처리를 위한 별도의 서브시스템을 구현하여 기존 음성 트래픽 처리에는 부하를 주지않는 방안을 제시하였다 또한 실질적으로 인터넷 트래픽 처리를 담당하는 서브시스템의 성능을 분석하였다.

• Journal of electromagnetic engineering and science
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• 제3권2호
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• pp.133-139
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• 2003

The nonuniqueness of a mathematically rigorous solution to 2-dimensional inverse scattering problems is explained in a limiting view of the numerical calculations based on the spectral-domain moment method. It is illustrated that its theoretical uniqueness cannot be assured even by performing additional measurements of the scattered fields not only along multiple lines but also with angular/frequency-diversities. In a real situation, however, computational error and measurement noise are inevitable. Those limitations render it meaningless to controvert the existence of a theoretically rigorous solution. Hence the most practical issue is how to remedy the instability of its practically approximate solution.

• 한국문화재보존과학회:학술대회논문집
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• 한국문화재보존과학회 2005년도 제22회 학술대회 발표 논문집
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• pp.179-184
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• 2005

Materials used for repairing and restoring both pottery and porcelain are practically organic, which makes the analysis procedure difficult in the course of time. It is, however, important in the field of conservation to analyze the material applied in the past. In consequence, this research will examine the components of the restoration materials collected in the process of ceramic conservation: the fillings using SEM-EDS and FT-IR; retouching materials; the adhesive used between the filling and retouching material.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.103-108
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• 2003

The control of flame shapes in a laminar pre-mixed flame has been experimentally investigated for propane/air pre-mixed laminar flames. Flames of different size and shapes are observed with heated wires or by controlling the equivalence ratio and flow rate of a mixture. The characteristics of the partitioning of a flame or the merge of flames are analyzed and explained by considering the balance between laminar flame speed and upstream mixture velocity. A combustor might be sized down while maintaining its heat production rate the same by partitioning a flame established in it. When the equivalence ratio of mixture is decreased, individual flames are merged together and the upstream mixture velocity can be practically decreased on a nozzle having opening ratio less than unity. As a result, the flame shape is to he adjusted until the newly established balanced condition is satisfied, and then. the stable combustion can be achieved again.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.597-608
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• 2008

Marketing has been used the power of data and information technology in the pursuit of personal marketing of products and service to customers, based on their preferences and needs. We analyzed the performance of twenty six combined(RFM and Confidence) response modeling methods that were proposed by Zahavi and Levin(l997) and Sho, et al.(1999). As a result, we were able to increase about 3.5%p. forecasting accuracy of customers response through combination with confidence(C) that is able to consider characteristics of product than using the single RFM model that is practically the most widely used.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.475-485
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• 2008

One of main issues in watermarking is to resolve the strength of watermark for solving the problem of trade-off between fidelity and robustness of watermarking. In the previous research, the strength of watermark has been resolved fixed value generally without considering local image characteristics such as image brightness, contrast, and edge. This paper proposes a new model to predict the strength of watermark considering local image characteristics such as image brightness, contrast, and edge for digital wavelet transform(DWT)-based image watermarking. For the study, psychological experiment was fulfilled to measure the human image perception and regression analysis showed the proposed model was statistically significant at the level of ${\alpha}\;=\;0.01$. Also the model is practically validated on fidelity and robustness of watermarking.

• 전기학회논문지
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• 제57권6호
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• pp.1036-1041
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• 2008

Periodic disturbance is practically occurred in several engineering applications, especially in data storage systems. However, recently addressed controls for such problem were mostly dealt with its deterministic nature, which is rarely practical in real-time implementation. We present an adaptive control approach for DC motor systems with periodic stochastic disturbance whose frequency and magnitude are both random variables. We establish adaptive state feedback control which is linearly composed of nominal and corrective control parameter matrices. The former is derived from a nominal system model voiding disturbance and the latter is constructed from a disturbed system model by using Lyapunov stability theory. We carry out computer simulation to evaluate the proposed control methodology and compare to the recently addressed control method to demonstrate its superiority.