• 정보처리학회논문지C
• /
• 제18C권1호
• /
• pp.31-44
• /
• 2011

네트워크 기반의 적절한 컴퓨팅은 네트워크 대역폭의 가용성에 의존한다. 백본 네트워크 용량과 액세스 네트워크 상에 심각한 버틀넥이 발생하여 ISP 사업자와 고객 간의 갭이 발생된다면 그만큼 ISP 사업자는 사업에 불이익을 초래할 수 있다. 이러한 상황이 발생되기 이전 ISP 사업자가 트래픽량 예측과 종단간 오버로드가 높은 링크 구간을 감지할 수 있다면 ISP 사업자와 고객 간의 갭은 그만큼 줄어 들 수 있을 것으로 판단된다. 따라서 본 논문은 트래픽량 예측과 종단간 오버로드가 높은 링크 구간을 감지 가능한 소프트웨어로 ACE, ADM, Flow Analysis를 소개한다. 이들 툴을 이용하여 전자상거래의 연속적인 트랜잭션을 실망에서 측정한 후 측정된 네트워크 데이터를 가상 망 환경에 임포트하고 백그라운드 트래픽을 생성한다. 이와 같은 가상 망 환경을 토대로 점차적인 사용자 수 증가에 따른 트래픽량 예측과 링크 로드가 높은 구간을 시뮬레이션 결과로 알 수 있었다.

• 대한지하수환경학회지
• /
• 제6권4호
• /
• pp.180-187
• /
• 1999

일반적으로 비양수량은 쉽게 구해지지만 투수량계수를 구하려면 정규 양수시험을 시행하는데 많은 시간과 비용이 소요되기 때문에 비양수량 자료로부터 투수량계수를 추정하는 방법이 이용되기도 한다. 대개 Theis(1963). Brown (1963). Logan(1964)등이 유도한 해석적 방법이 이용되는데 이 방법들은 충적 대수층에서 영향반경 또는 저류계수등을 가정하여 대입하므로서 비양수량으로부터 투수량계수를 예측하는 것이 통상적이다. 그러나 암반 대수층이나 비균질 대수층에서 이렇게 구한 투수량계수는 실측된 투수량계수와 잘 맞지 않는다. Razack-Huntley(1991). Huntley-Steffey(1992). Mace(1997) 등은 비균질 충적대수층, 균열암반대수층. 용해성 석회암대수층 등에서 비양수량과 투수량계수의 관계식을 제시하였다. 본 연구에서는 제주도의 화산암 대수층에서 투수량계수와 비양수량 자료를 비교 분석한 바. 투수량계수의 대수값과 비양수량의 대수값 사이에 선형적인 관계가 성립(상관계수 0.951)하는 것을 확인 하였다. 또한 투수량계수의 $\pm$0.25 log cycle 범위내에 대부분의 자료가 포함되고 있다(96.6%).

• Asian-Australasian Journal of Animal Sciences
• /
• 제29권2호
• /
• pp.241-249
• /
• 2016

The supplementation of livestock feed with animal protein is a present cause for public concern, and plant protein shortages have become increasingly prominent in China. This conflict may be resolved by fully utilizing currently available sources of plant protein. We estimated the rumen degradability and the small intestinal digestibility of the amino acids (AA) in rapeseed meal (RSM), soybean meal (SBM), sunflower seed meal (SFM) and sesame meal (SSM) using the mobile nylon bag method to determine the absorbable AA content of these protein supplements as a guide towards dietary formulations for the dairy industry. Overall, this study aimed to utilize protein supplements effectively to guide dietary formulations to increase milk yield and save plant protein resources. To this end, we studied four cows with a permanent rumen fistula and duodenal T-shape fistula in a $4{\times}4$ Latin square experimental design. The results showed that the total small intestine absorbable amino acids and small intestine absorbable essential amino acids were higher in the SBM (26.34% and 13.11% dry matter [DM], respectively) than in the SFM (13.97% and 6.89% DM, respectively). The small intestine absorbable Lys contents of the SFM, SSM, RSM and SBM were 0.86%, 0.88%, 1.43%, and 2.12% (DM basis), respectively, and the absorbable Met contents of these meals were 0.28%, 1.03%, 0.52%, and 0.47% (DM basis), respectively. Among the examined food sources, the milk protein score of the SBM (0.181) was highest followed by those of the RSM (0.136), SSM (0.108) and SFM (0.106). The absorbable amino acid contents of the protein supplements accurately reflected protein availability, which is an important indicator of the balance of feed formulation. Therefore, a database detailing the absorbable AA should be established.

• Ocean and Polar Research
• /
• 제37권1호
• /
• pp.23-35
• /
• 2015

A 450 m-long sediment section was recovered from Hole U1359D located at the eastern levee of the Jussieau submarine channel on the Wilkes Land continental rise (East Antarctica) during IODP Expedition 318. The age model for Hole U1359D was established by paleomagnetic stratigraphy and biostratigraphy, and the ages of core-top and core-bottom were estimated to be about 5 Ma and 13 Ma, respectively. Biogenic opal content during this period varied between 3% and 60%. In the Southern Ocean, high biogenic opal content generally represents warm climate characterized by the increased light availability due to the decrease of sea-ice distribution. The surface water productivity change in terms of biogenic opal content at about 10.2 Ma in the Wilkes Land continental rise was related to the development of Northern Component Water. After about 10.2 Ma, more production of Northern Component Water in the North Atlantic caused to increase heat transport to the Southern Ocean, resulting in the enhanced diatom production. Miocene isotope events (Mi4~Mi7), which are intermittent cooling intervals during the Miocene, appeared to be correlated to the low biogenic opal contents, but further refinement was required for precise correlation. Biogenic opal content decreased abruptly during 6 Ma to 5.5 Ma, which most likely corresponds to the Messinian salinity crisis. Short-term variation of biogenic opal content was related to the extent of sea-ice distribution associated with the location of Antarctic Polar Front that was controlled by glacial-interglacial paleoclimate change, although more precise dating and correlation will be necessary. Diatom production in the Wilkes Land continental rise increased during the interglacial periods because of the reduced sea-ice distribution and the southward movement of Antarctic Polar Front.

• 한국물환경학회지
• /
• 제23권5호
• /
• pp.766-775
• /
• 2007

The use of toxic chemicals was extended as the industry in Korea has grown dramatically during the last three decades. However, list of toxic substances and limit concentrations in the water environment are not consistent within management of ambient water, drinking water and industrial effluent. This article suggests the systematic framework to classify toxic substances in the water environment and deriving their effluent limits. The most important factor for decision-making to classify toxic substances is whether their concentrations in the water environment are higher than the reference concentrations, estimated by considering human health risk and ecological risk. Using a risk-based reference concentration, the ambient water quality criterion, it is possible to derive the regulatory limit concentrations of toxic substances in drinking water and in industrial effluent. The goal concentrations in the effluent, which guarantee the human and ecological safety, should be determined with scientific investigation, balancing environmental benefit and economical effect, considering availability of treatment technology and identifying characteristics of wastewater from different industries.

• 치과방사선
• /
• 제20권2호
• /
• pp.277-287
• /
• 1990

The purpose of this study was to estimate the diagnostic availability of the common periapical lesions by using computer. The author used a domestic personal computer and rearranged the applied program appropriately with RF (Rapid File), a program to answer the purpose of this study, and then input the consequence made out through collection, analysis and classification of the clinical and radiological features about the common periapical lesions as a basic data. The 256 cases (Cyst 91, Periapical granuloma 74, Periapical abscess 91) were obtained from the chart recordings and radiographs of the patients diagnosed or treated under the common periapical lesions during the past 8 years (1983-1990) at the infirmary of Dental School, Chosun University. Next, the clinical and radiographic features of the 256 cases were applied to RF program for diagnosis, and the diagnosis by using computer was compared with the hidden final diagnosis by clinical and histopathological examination. The obtained results were as follows: 1. In cases of the cyst, diagnosis through the computer program was shown rather lower accuracy (80.22%) as compared with accuracy (90.1 %) by the radiologists. In cases of the granuloma, diagnosis through the computer program was shown rather higher accuracy (75.7%) as compared with the accuracy (70.3%) by the radiologists. 2. In cases of periapical abscess, the diagnostic accuracy was shown 88% in both diagnoses. 4. The average diagnostic accuracy of 256 cases through the computer program was shown rather lower accuracy (81.2%) as compared with the accuracy (82.8%) by the radiologists. 5. The applied basic data for radiographic diagnosis of common periapical lesions by using computer was estimated to be available.

• 한국융합학회논문지
• /
• 제7권5호
• /
• pp.23-28
• /
• 2016

본 논문에서는 스마트 기기를 이용하여 4-6세 유아와 부모를 사용자 계층으로 선정하여 교육내용과 더불어 관련 게임들을 통합하여 유아들이 공부에 대한 흥미를 잃어버리지 않고 집중력 있게 한글, 영어, 숫자를 학습할 수 있도록 유아학습용 모바일 에듀테이너 앱을 설계하였다. 부모들을 위해 다양한 매체와 유아의 집중력과 학습의 대한 흥미를 증가 시킬 수 있는 한글, 숫자, 영어 낱말카드들을 설계하였고, 그림찾기, 기억력게임, 퍼즐 맞추기 등 여러 가지 학습게임들 까지 제공 하였다. 또한 유아들이 공부를 하며 지루하지 않게 시각적인 학습과 청각적인 학습이 동시에 이루어질 수 있게 함으로써 엄마들이 더욱 편리하게 자녀의 학습을 지도할 수 있게 편리성과 이동성, 가용성을 극대화시켜 구현하였다.

• 한국터널지하공간학회 논문집
• /
• 제5권1호
• /
• pp.13-21
• /
• 2003

콘크리트 라이닝의 안정성을 검토하기 위해 지난 수년간 많은 연구가 이루어졌으며, 많은 비파괴 조사 기법들이 개발되고 발전하였다. 이러한 비파괴 조사 기법들은 그 신호 해석 과정에서 대부분 푸리에 이론을 근간으로 하고 있다. 그러나 진동신호에 대하여 푸리에 해석을 적용할 경우 결과는 단지 주파수 영역상에서 확인될 뿐이며, 이러한 결과로는 정확한 대상 신호의 분석을 기대할 수 없다. 따라서 본 연구에서는 충격하중으로 인하여 발생한 비정상 파의 해석을 위하여 웨이블릿 이론을 적용하였으며, 웨이블릿 변환의 적용성을 확인하기 위하여 콘크리트 라이닝을 모사한 모형을 대상으로 실험을 수행하고, 제안된 이론을 바탕으로 콘크리트 라이닝의 두께를 추정하였다. 본 연구로부터 푸리에 변환에 비해 웨이블릿 변환이 뛰어난 분해능을 제공함을 확인할 수 있었으며, 분산성을 갖는 파를 해석함에 있어서도 웨이블릿 변환이 뛰어난 신호 해석법임을 확인할 수 있었다.

• Asian Pacific Journal of Cancer Prevention
• /
• 제13권10호
• /
• pp.5125-5129
• /
• 2012

Economic decision models are being increasingly used to assess medical interventions. Advances in this field are mainly due to enhanced processing capacity of computers, availability of specific software to perform the necessary tasks, and refined mathematical techniques. We here estimated the incremental cost-effectiveness of ten strategies for colon cancer screening, as well as no screening, incorporating quality of life, noncompliance and data on the costs and profit of chemotherapy in Iran. We used a Markov model to measure the costs and quality-adjusted life expectancy of a 50-year-old average-risk Iranian without screening and with screening by each test. In this paper, we tested the model with data from the Ministry of Health and published literature. We considered costs from the perspective of a health insurance organization, with inflation to 2011, the Iranian Rial being converted into US dollars. We focused on three tests for the 10 strategies considered currently being used for population screening in some Iranians provinces (Kerman, Golestan Mazandaran, Ardabil, and Tehran): low-sensitivity guaiac fecal occult blood test, performed annually; fecal immunochemical test, performed annually; and colonoscopy, performed every 10 years. These strategies reduced the incidence of colorectal cancer by 39%, 60% and 76%, and mortality by 50%, 69% and 78%, respectively, compared with no screening. These approaches generated ICER (incremental cost-effectiveness ratios) of $9067, $654 and $8700 per QALY (quality-adjusted life year), respectively. Sensitivity analyses were conducted to assess the influence of various scales on the economic evaluation of screening. The results were sensitive to probabilistic sensitivity analysis. Colonoscopy every ten years yielded the greatest net health value. Screening for colon cancer is economical and cost-effective over conventional levels of WTP8.

• 대한공간정보학회지
• /
• 제15권4호
• /
• pp.31-39
• /
• 2007

최근 국내의 항공디지털카메라 영상의 도입 및 공급이 현실화됨에 따라 정사영상 및 수치지도를 포함한 지리정보제작에 많은 관심이 모아지고 있다. 따라서, 본 연구에서는 항공디지털사진의 정사영상을 제작하여 수치지도를 갱신하는 방법을 제시하고자 하였다. GPS 측량성과를 이용하여 기하보정을 수행하고, 항공 Lidar DEM을 이용하여 정사영상을 제작하였으며, GPS측량성과를 이용하여 절대위치정확도평가, 수치지도의 건물레이어에 대해서는 1/1,000 수치지도를 이용하여 상대위치정확도평가를 수행하였다. 정사영상에 대한 정확도 평가결과, RMSE가 X, Y방향으로 각각 ${\pm}0.076m,\;{\pm}0.294m$가 발생하였으며, 수치지도에 대한 정확도 평가결과, RMSE가 X, Y방향으로 각각 ${\pm}0.250m,\;{\pm}0.210m$이 발생하였으므로, 항공디지털사진의 정사영상을 이용한 수치지도의 건물레이어 갱신결과는 국토지리정보원 규정의 허용오차 이내였으므로, 향후 기본지리정보 구축은 물론 지자체의 GIS사업 및 다양한 분야에 활용할 수 있다.