• Asian-Australasian Journal of Animal Sciences
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• 제14권11호
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• pp.1527-1533
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• 2001

Garole is a prolific, rare, less known and small size Indian sheep breed found in low and humid Sunderban region of West Bengal. Although information on stored Garole ram liquid semen upto 24 h is available, but there is a need to further investigate the short-term and long-term preservability of Garole ram semen for extensive utilization of this valuable germplasm by artificial insemination. The aim of the present study was to apply computer-assisted sperm analysis technique for assessing the motion characteristics of Garole ram semen stored (i) in liquid state at refrigeration temperature for short-term preservation upto 48 h and (ii) in frozen state at $-196^{\circ}C$ for long-term preservation after packaging in mini straws. Short-term preservation had a significant effect on motility (p<0.01) as the motility progressively decreased from 90.1% at 0 h to 85.5% and 73.2% after 24 and 48 h of storage, respectively. Although the decline in rapid moving sperms was also significant (p<0.01) on storage but the decrease was more pronounced at 48 h as compared to 24 h of storage period. Storage of chilled semen had also a significant effect on % linearity (p<0.05), % straightness (p<0.01), sperm velocities (p<0.01), amplitude of lateral head displacement (p<0.01) and beat frequency (pO.Ol) of spermatozoa. The replication had a significant effect for all the variables except average path and straight line velocity. However, the interactions of short-term storage and replication were non-significant for most of the variables except % of medium moving sperms, sperm velocities and beat frequency. On long-term preservation of Garole ram spermatozoa under controlled conditions the mean post-thaw recovery of 70.4 and 71.4% motile spermatozoa was achieved having 48.8 and 48.9% of rapidly motile spermatozoa, respectively in both the replicates. The effect of replication on cryopreservation was significant (p<0.05) on amplitude of lateral head displacement and beat frequency, but there was no significant effect on motility, rapidly motile spermatozoa, linearity, straightness and sperm velocities of frozen-thawed spermatozoa. It can be concluded from these results that an average 70% motility can be achieved on storage of Garole ram semen in chilled liquid state upto 48 h or in liquid nitrogen after freezing under controlled conditions in straws. However, further studies are required to evaluate the fertility of short-term and long-term preserved Garole ram semen for extensive use of this prolific sheep breed.

• 생태와환경
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• 제50권3호
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• pp.314-324
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• 2017

국내 습지의 가치와 등급을 평가하고 적용방안을 고찰하기 위해, 경상남도에 위치한 146개 습지를 대상으로 신속평가방법 (Rapid Assessment Method)을 이용한 습지평가를 수행하였다. 각 습지에서 평가된 8개 대항목과 주변 피복 비율 간 관계를 분석하기 위해 Self-Organizing Map(SOM) 알고리즘을 이용하여 패턴분석을 실시하였다. 총 8개의 항목 중, '식생다양성 야생동물 서식처'와 '미적 레크레이션' 항목 점수가 가장 높았으며, 대부분 2~3등급의 가치를 가지는 것으로 평가되었다. SOM 분석 결과, 식생다양성 야생동물 서식처 항목이 높은 습지에는 대부분 어류 양서 파충류 서식처 항목이 낮은 성향을 보였는데, 이는 어류 등은 식생다양성이 높은 지역을 선호하지 않기 때문인 것으로 사료된다. 습지 내 수생식물의 높은 풍부도는 미적인 부분을 충족시키기 때문에 미적 레크레이션 점수가 높은 습지는 대부분 식생다양성 야생동물 서식처가 높았다. 또한, 침식조절 기능의 경우 홍수 저장 조절 기능과 밀접하게 관련되며, 침식조절 기능이 높은 습지는 홍수 저장 조절 기능 또한 높은 경향을 가진다. 국내 습지에 신속평가방법을 적용한 결과, 일부 항목이 국내 습지 특성이나 범위에 맞지 않아 개선이 요구되며, 습지 보전 측면에서 '접근성'이나 '시각적 개방성' 등 항목들은 점수 체제의 전환이 필요한 것으로 나타났다. 따라서 신속평가방법을 국내 습지에 적용하기 위해서는 항목 내 평가기준의 조정 혹은 세분화, 현실화가 필요한 것으로 판단된다. 향후 신속평가방법을 이용한 등급화는 습지의 보전이나 관리 방안 마련에 중요한 지표로서 활용될 수 있으며, 잔존하는 습지를 보존하여 멸종위기종 등 생물상 유지에 크게 기여할 수 있을 것으로 사료된다.

• 한국환경복원기술학회지
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• 제12권5호
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• pp.92-100
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• 2009

This study was surveyed from May to October, 2008 in order to classify type distribution and evaluate the function of inland wetland as a ecological axis in Chungnam province. Assessment was done by modified-RAM (Rapid Assessment Method). RAM is consisted of total 8 functions and divided into high, moderate, low. The conservation grade of RAM is divided into 4 grades; absolute conservation, conservation, improvement and restoration. Throughout survey on total 13 wetlands of Lacustrine, Palustrine wetland which are distributed in Chungnam province, their function was assessed. As result, the 2 wetlands were judged as absolute conservation grade by assessment of 8 functional contents, and 7 sites were improvement wetlands and 4 sites were conservation wetlands. The function of wetlands assessed as conservation grade showed high in water quality protection and improvement. Also, showed high in vegetation diversity, wildlife habitat and aesthetic recreation. Meanwhile, showed low in Water quality purification, Shoreline/Stream Bank Protection. Of wetlands evaluated as conservation grade, Jeong-juk Ji and Dun-ri reservoir were assessed as absolute conservative area. These wetlands are essential to be managed continuously as a area having high ecological value. Farther, these wetlands will be done as a axis of ecological network related to 'Kumbuk jeongmaek' ecosystem.

• 한국음향학회지
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• 제21권8호
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• pp.679-685
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• 2002

천해에서의 저주파 단상태 잔향음 모델 (L-HYREV: Low-frequency Hanyang univ. Reverberation model)을 개발하였다. 음선이론 (ray-theory)에 기초한 전파모델은 해저 내로 투과되는 음파에 대한 효과를 적절하게 고려할 수 없으므로, 해저 내 상호작용을 계산할 수 있는 전파모델이 필요하다. 따라서 본 논문에서는 RAM(Range dependent Acoustic Model)을 이용해서 전달손실을 계산 후, 다중경로 확장모델 (multi-path expansion model)을 이용해서 산출한 전달손실을 보정하였다. 모델의 검증을 위하여 GSM (generic sonar model) 잔향음 모의 신호 및 실측 잔향음 신호와 비교하였으며, 비교 결과 GSM보다 L-HYREV 모델이 저주파 잔향음 예측에 적합함을 확인할 수 있다.

• Korean Chemical Engineering Research
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• 제55권5호
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• pp.668-678
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• 2017

Intermolecular interactions were studied for binary mixtures of 2-propanol + cyclohexane, n-hexane, benzene, toluene, o-, m- and p-xylenes by measuring ultrasonic speeds (u) over the entire range of composition at 298.15 K and 308.15 K. From these results the deviation in ultrasonic speed was calculated. These results were fitted to the Redlich-Kister equation to derive the binary coefficients along with standard deviations between the experimental and calculated data. Acoustic parameters such as excess isentropic compressibility ($K_s^E$), intermolecular free length ($L_f$) and available volume ($V_a$) were also derived from ultrasonic speed data and Jacobson's free length theory. The ultrasonic speed data were correlated by Nomoto's relation, Van Dael's mixing relation, impedance dependence relation, and Schaaff's collision factor theory. Van Dael's relation gives the best prediction of u in the binary mixtures containing aliphatic hydrocarbons. The ultrasonic speed data and isentropic compressibility were further analyzed in terms of Jacobson's free length theory.

• Korean Chemical Engineering Research
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• 제56권4호
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• pp.536-541
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• 2018

Excess molar volumes ($V_m^E$) of binary mixtures of 1-propanol or 2-propanol (1) + cyclohexane or n-hexane (2) were measured with V-shaped dilatometer at 303.15 K. The $V_m^E$ data for these mixtures varied as: 2-propanol > 1-propanol and were higher for cyclohexane than n-hexane for both propanol systems. The experimental data were correlated with Redlich-Kister polynomial. The $V_m^E$ data were interpreted qualitatively as well as quantitatively in terms of Flory-Treszczanowicz-Benson model and Prigogine-Flory-Patterson theory. Both models correctly described the sign and shape of $V_m^E$ vs $x_1$ curves. The values calculated by both the models agree well with the experimental data.

• 한국정보통신학회논문지
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• 제15권6호
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• pp.1397-1403
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• 2011

본 논문에서는 W-Band(75 GHz~110 GHz) 주파수 대역에서 전파특성 분석을 위한 샘플홀더 제작을 위하여 수행되었다. 먼저 도파관 내에서 전파의 전파이론을 정립하고 재료정수 측정기법을 도출하였다. 그리고 밀리미터파 W-band에 알맞은 도파관형 샘플홀더를 설계 및 제작하고 RAM 샘플을 이용하여 재료정수 및 전파흡수능을 측정하여 분석하였다. 분석결과 샘플시료 특성을 정확하게 측정할 수 있음을 확인하였으며, 향후 이 측정 샘플홀더는 W-band 대역 전파특성 분석을 위해 매우 유용하게 쓰일 수 있을 것이다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제3권5호
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• pp.129-140
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• 2014

기존의 메모리에서 발생하는 다양한 고장들을 검출하기 위한 기법으로 BIST(Built-in self test)가 있고 고장이 검출되면 Spare를 할당하여 수리하는 BIRA(Built-in redundancy analysis)가 있다. 그리고 BIST와 BIRA를 통합한 형태인 BISR(Built-in self repair)를 통해 전체 메모리의 수율을 증가시킬 수 있다. 그러나 이전에 제안된 기법들은 RAM을 위해 제안된 기법으로 RAM의 메모리 구조와 특성이 다른 NAND-형 플래시 메모리에 사용하기에는 NAND-형 플래시 메모리의 고유 고장인 Disturbance를 진단하기 어렵다. 따라서 본 논문에서는 NAND-형 플래시 메모리에서 발생하는 Disturbance 고장을 검출하고 고장의 위치도 진단할 있는 BISD(Built-in self diagnosis)와 고장 블록을 수리할 수 있는 BISR을 제안한다.

• 시스템엔지니어링학술지
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• 제7권2호
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• pp.13-19
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• 2011

A LRT(Light Rail Transit) is one of the Future Urban Railway Development Project. The project's goal is to reduce a transportation congestion in the center of the city. New transportation is intensely required in order to overcome a limit of the ground transportation that is the existing public transportation, A LRT(Light Rail Transit) construction project to be based on an unmanned driving system is the large composition system that a vehicle, a signal, communication, electric, track etc. were organically integrated as echo-friendly urban transportation systems. It also put a huge budget, which is a large-scale infrastructure projects. It is international trend that Light Rail Transit projects apply a technique in System Engineering for a schedule, cost, quality elevations, and to approach in viewpoints of life-cycle from initial construction steps to operation, abolition. This paper intends to analyze RAM requirements taking into consideration ISO/IEC 15288 throughout life-cycle from concept, design, manufacture, operation and maintenance to the final phase, decommissioning, and the study seeks to suggest directions of efficient use to domestic LRT projects.

• 한국환경과학회지
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• 제24권7호
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• pp.865-874
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• 2015

This study was conducted to investigate the correlation between the distribution chart and input data of the predicted 3-second gust and damage cost, by using the forecast field and analysis field of Regional Data Assimilation Prediction System (RDAPS) as initial input data of Korea risk assessment model (RAM) developed in the preceding study. In this study the cases of typhoon Rusa which caused occurred great damage to the Korean peninsula was analyzed to assess the suitability of initial input data. As a result, this study has found out that the distribution chart from the forecast field and analysis field predicted from the point where the effect due to the typhoon began had similarity in both 3-second gust and damage cost with the course of time. As a result of examining the correlation, the 3-second gust had over 0.8, and it means that the forecast field and analysis field show similar results. This study has shown that utilizing the forecast field as initial input data of Korea RAM could suit the purpose of pre-disaster prevention.