• Asian-Australasian Journal of Animal Sciences
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• 제24권10호
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• pp.1456-1463
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• 2011

A total of 629 Duroc${\times}$Landrace${\times}$Large White crossbred pigs were utilized in three experiments (Exp. 1, 222 pigs weighing $25.6{\pm}2.0\;kg$ BW; Exp. 2, 216 pigs weighing 5$6.2{\pm}4.3\;kg$ BW; Exp. 3, 191 pigs weighing $86.4{\pm}4.6\;kg$ BW) conducted to determine the effects of fermented potato pulp on performance, nutrient digestibility, carcass traits and plasma parameters in growingfinishing pigs. Each experiment lasted 28 d. The pigs were assigned to one of two corn-soybean meal-based diets containing 0 or 5% fermented potato pulp. The inclusion of fermented potato pulp increased weight gain (p<0.05) in experiments 1 and 2 and increased feed intake (p<0.05) in experiment 2. Feed conversion was improved (p<0.05) in experiment 2 and showed a tendency to improve (p<0.10) in experiments 1 and 3 when pigs were fed fermented potato pulp. Fermented potato pulp increased (p<0.05) dry matter digestibility in experiments 1 and 3 and energy digestibility in experiment 2. Feeding fermented potato pulp decreased plasma urea nitrogen (p<0.05) and alanine aminotransferase (p<0.05) in experiments 1 and 2, while plasma aspartate aminotransferase was decreased (p<0.05) in experiment 3. Dietary fermented potato pulp did not affect the carcass characteristics of finishing pigs. Feeding fermented potato pulp reduced (p<0.05) fecal ammonia concentration in all three experiments. In conclusion, feeding growing-finishing pigs diets containing 5% fermented potato pulp improved weight gain and feed conversion without any detrimental effects on carcass traits. The improvements in pig performance appeared to be mediated by improvements in nutrient digestibility.

• 한국과학교육학회지
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• 제27권1호
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• pp.59-69
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• 2007

이 연구에서는 과학실험의 새로운 방법으로 학교현장에서 도입 단계에 있는 컴퓨터를 기반으로 하는 MBL실험에 대하여 초 중 고 교사들의 인식을 조사하였다. 이를 위해 초 중 고등학교의 과학교과서에 나오는 실험 주제 중 MBL(microcomputer based laboratory) 실험으로 대체할 수 있는 실험주제를 세 가지씩 선정 하여 초 중 고등학교 과학 교사들에게 연수를 실시한 후 MBL실험 연수 내용 MBL실험기대효과 연수 후 MBL실험 적용 의지에 대하여 설문조사를 실시하였다 연구 결과, 초 중 고등학교 교사 모두 MBL실험 연수가 매우 유익하고 유용하다고 생각하였으나 연수내용 수준에 대하여 약간 높게 생각하였다. 또한 MBL실험에 대한 기대효과로는 컴퓨터를 이용하는 MBL실험은 정확하고 빠르게 데이터를 수집하고 처리 할 수 있어 실험 시간을 단축할 수 있으며, 단축된 실험시간을 실험결과를 분석하고 토론하는 활동에 활용할 수 있어서 올바른 개념 형성과 그래프 해석 능력 및 탐구력 신장에 효과적일 것이라고 생각하였다. 그러나 실험기구 조작 능력 향상에는 효과적이라고 생각하지 않았다. 또한 대부분의 교사들은 연수 후에 과학실험 수업에 바로 이용하려는 의지가 높게 나타났으나, 새로운 교육과정에 도입하기 위해서는 MBL실험을 위한 도구 구입과 낙후된 실험실 여건, 교사 연수 기회 부족 등이 장애라고 지적하였다. MBL실험의 확장 적용을 위해서는 MBL실험 도구의 단가를 낮추기 위한 기술 개발 및 각종 센서의 제작 보급과 함께 MBL실험 자료 개발과 교사연수가 확대되어야 할 것이다.

• 한국과학교육학회지
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• 제28권8호
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• pp.870-879
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• 2008

이 연구는 26종의 중학교 1, 2, 3학년 과학 교과서에서 '물질' 분야에 제시된 실험 활동에서 요구하고 있는 실험 수행 능력을 조사하고 분석하였다. 물질 분야에는 전체 7 단원에 걸쳐 총 359개의 실험이 제시되었다. 실험수행능력 분석틀에 따라 실험을 분석해 본 결과, 중학교 실험을 수행하기 위해서 다양한 실험수행능력이 필요하고, 학년별로 차이를 보였지만 전체적으로는 유사한 패턴을 가지고 있음이 조사되었다. 전학년에 걸쳐 결과 정리와 자료 해석 및 일반화 능력이 가장 많이 요구되고 대체 실험과 관련된 능력들은 상대적으로 빈도가 낮은 것으로 조사되었다. 3학년의 경우, 1, 2학년 실험과 비교하여 상대적으로, 실험 수행을 위한 세부적인 능력이 골고루 필요로 하는 실험이 많이 포함되어 있었다. 실험 상황 예측, 실험기구 설치, 측정기구사용, 오차원인 분석 능력은 2학년에게 상대적으로 많이 요구되는 것으로 조사되었다. 실험기구 설치 능력은 1, 2학년에서, 안전사고 위험 숙지 능력은 1, 3학년에서 상대적으로 많이 요구되는 능력으로 조사되었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.11-14
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• 2006

We present an overview on the observation and research for the China seas using both field experiments and multi-sensor satellite data at ORSI/OUC, covering two topics: (1) Spatial and temporal distribution of internal waves in the China Seas and retrieval of internal wave parameters; (2) Retrieval, validation, and cross-comparison of multi-sensor ocean color data as well as ocean optics in situ experiments in the East China Sea. We also present an incoherent Doppler wind lidar, developed by ORSI, and its observation for marine-atmospheric boundary layer.

• ETRI Journal
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• 제27권3호
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• pp.312-318
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• 2005

Mid-span spectral inversion (MSSI) has to utilize high optical pump power, for its operation principle is based on a nonlinear optical wavelength conversion. In this paper, a low pump-power operation of MSSI-based chromatic dispersion compensation (CDC) has been achieved successfully, for the first time to our knowledge, by introducing a noise pre-reduction scheme in cascaded wavelength conversions with periodically poled $LiNbO_3$ waveguides at a relatively low operation temperature. As preliminary studies, phase-matching properties and operation-temperature dependence of the wavelength converter (WC) were characterized. The WC pumped at 1549 nm exhibited a wide conversion bandwidth of 59 nm covering the entire C-band and a conversion efficiency of -23.6 dB at 11 dBm pump power. CDC experiments were implemented with 2.5 and 10 Gb/s transmission systems over 100 km single-mode fiber. Although it is well-known that the signal distortion due to chromatic dispersion is not critical at a 2.5 Gb/s transmission, the clear recovery of eye patterns was identified. At 10 Gb/s transmission experiments, eye patterns were retrieved distinctly from seriously distorted ones, and notable improvements in bit-error rates were acquired at a low pump power of 14 dBm.

• Journal of Information Processing Systems
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• 제11권2호
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• pp.205-228
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• 2015

In this paper, we present a virtual laboratory platform (VLP) baptized Mercury allowing students to make practical work (PW) on different aspects of mobile wireless sensor networks (WSNs). Our choice of WSNs is motivated mainly by the use of real experiments needed in most courses about WSNs. These experiments require an expensive investment and a lot of nodes in the classroom. To illustrate our study, we propose a course related to energy efficient and safe weighted clustering algorithm. This algorithm which is coupled with suitable routing protocols, aims to maintain stable clustering structure, to prevent most routing attacks on sensor networks, to guaranty energy saving in order to extend the lifespan of the network. It also offers a better performance in terms of the number of re-affiliations. The platform presented here aims at showing the feasibility, the flexibility and the reduced cost of such a realization. We demonstrate the performance of the proposed algorithms that contribute to the familiarization of the learners in the field of WSNs.

• Journal of Microbiology and Biotechnology
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• 제14권6호
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• pp.1190-1195
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• 2004

In recent years, there has been an intensive research on decolorization of dye and textile wastewater by various fungal strains. In this study, the decolorization ability of three commercial dyes, acid yellow 99, acid blue 350, and acid red 114, were investigated using 10 fungal strains. Among the fungal strains tested, Trametes versicolor KCTC 16781 completely decolorized all dyes in both solid and liquid experiments, and was also able to decolorize the mixture of those three dyes in liquid experiments. The secretion of the ligninolytic enzymes into the extracellular medium during decolorization by T versicolor KCTC 16781 was also studied. No lignin peroxidase activity was detected, and manganese peroxidase and laccase activities were investigated.

• Asian-Australasian Journal of Animal Sciences
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• 제7권2호
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• pp.279-288
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• 1994

Three experiments were conducted with female Japanese Saanen goats to investigate the effects of rumen protected methionine (RPMet) on N utilization and whole-body protein turnover. Whole-body leucine flux from which whole-body protein turnover rates were derived was measured by primed- continuous infusion of L-[$^{15}N$] leucine in combination with gas chromatography-mass spectrometry. Throughout the experiments RPMet was added to a diet to supply 1.5 g DL-methionine per goat per day. Irrespective of the major N sources (i.e., protein or urea) in the diet, both N deposition and whole-body protein synthesis were increased (p<0.05), and urinary N excretion was decreased (p<0.05) by supplementing with RPMet, but not by supplementing with methionine. It was concluded, therefore, that under the present experimental conditions, the RPMet supplement was efficiently bypassed to result in enhanced body protein synthesis of the goat.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 2003년도 제23차 추계총회 및 국제학술심포지움
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• pp.46-50
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• 2003

In order to develop a new variety of rice that adapts to the climate of Aomori prefecture and possesses characteristics suitable for production of high quality Japanese sake, artificial cross experiments were executed between Yamadanishiki, which is widely used nationwide as an authentic variety of rice for sake production, and Hanafubuki, which was peviously developed by Aomori prefecture. An excellent hybrid, named Hanaomoi, was selected and fixed by a series of selection experiments and systematic cultivation. Unpolished Hanaomoi rice contained less amount of protein than Yamadanishiki and Hanafubuki. Unpolished rice of Hanaomoi was harder than Yamadanishiri and Hanafubuki, therefore polishing treatment was done in high yield and one could obtain a high degree of polish on the rice(namely 40% polishing). These features are advantageous to production of high quality of sake.Test brewing using 40% polished Hanaomoi gave rise to a characteristic sake that contained a slightly higher amount of alcohol and flavor components than Yamadanishiki and Hanafubuki. Sensory tests concluded that sake from Hanaomoi was as superior as the one from authentic Yamadanishiki. Hanaomoi is a promising variety of rice suitable for production of a high quality sake exclusive to Aomori prefecture.

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.1-10
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• 2020

This paper investigates the influence of the Circulating Water Channel (CWC) side wall and support struts on the hydrodynamic coefficient prediction for Autonomous Underwater Vehicles (AUVs) experiments. Computational Fluid Dynamics (CFD) method has been used to model the CWC tests. The hydrodynamic coefficients estimated by CFD are compared with the prediction of experiments to verify the accuracy of simulations. In order to study the effect of side wall on the hydrodynamic characteristics of the AUV in full scale captive model tests, this paper uses the CWC non-dimensional width parameters to quantify the correlation between the CWC width and hydrodynamic coefficients of the chosen model. The result shows that the hydrodynamic coefficients tend to be constant with the CWC width parameters increasing. Moreover, the side wall has a greater effect than the struts.