• 한국정보통신학회논문지
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• 제16권5호
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• pp.922-931
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• 2012

본 논문에서는 연속적인 트래픽 요구 변화에 대처할 수 있는 선박 백본 네트워크의 논리 토폴로지 재구성 방안을 연구하였다. 제안한 기법은 트래픽 포워딩 경로의 변경을 최소화하며, 동시에 트래픽 포워딩 경로의 평균 홉 수를 최소화하여 선박 백본 네트워크의 성능을 향상시킨다. 제안한 재구성 기법의 성능 분석을 수행한 결과, 연속적인 재구성 처리 과정에서 우수한 성능을 보여 주었다.

• 대한전기학회논문지
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• 제40권12호
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• pp.1230-1241
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• 1991

Asymmetrical pulse width modulated(APWM) control technique for AC chopper is proposed which can improve the input power factor. The ideal switching function for the proposed technique is derived and its optimal slope to maintain the input power factor to unity is calculated. By digital simulation several characteristics are investigated theoretically and then compared with those of the conventional PWM and the phase angle control technique. In order to maintain the input power factor to unity the optimal slope and the average value of the ideal switching function are calculated. The experimental results show a good agreement with the calculated ones, which proves the feasibility of the proposed technique.

• 상하수도학회지
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• 제20권6호
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• pp.789-797
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• 2006

This study was conducted to establish the refined model for prediction of flocculation/sedimentation efficiency in factual drinking water treatment plants using model tree technique. In order to carry out machine leaning for determining each linear model, five parameters; time, coagulant dose, raw water turbidity, SCD and conductivity, which were measured and collected from the field (K_DWTP), were selected and used. The existing analytical models developed by previous researchers were used only to examine closely the mechanism of flocculation rather than to apply it for practical purpose. The refined model established using model tree technique in this study could predict the factual sedimentation efficiency accurately (below 9% of average absolute error). Also, in aspect of engineering convenience, without any additional manipulation of parameters, it can be applied to practical works.

• 대한임베디드공학회논문지
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• 제6권6호
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• pp.345-359
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• 2011

In high performance embedded systems, the use of multiple on-chip memories is an essential architectural feature for exploiting inherent parallelism in multimedia applications. This feature allows multiple data accesses to be executed in parallel. However, it remains difficult to effectively exploit of multiple on-chip memories. The successful use of this architecture strongly depends on how to efficiently detect and exploit memory parallelism in target applications. In this paper, we propose a technique based on a linear array access descriptor [1], which is generated from profiled data, to detect and exploit memory parallelism. The proposed technique tackles an array reorganization problem to maximize memory parallelism in multimedia applications. We present preliminary experiments applying the proposed technique onto a representative coarse grained reconfigurable array processor (CGRA) with multimedia kernel codes. Our experimental results demonstrate that our technique optimizes data placement by putting independent data on separate storage. The results exhibit 9.8% higher performance on average compared to the existing method.

• International Journal of Automotive Technology
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• 제4권2호
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• pp.101-108
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• 2003

There are a lot of factors that influence automotive fuel economy such as average trip time per kilometer, average trip speed, the number of times of vehicle stationary, and so forth. These factors depend on road conditions and traffic environment. In this study, various driving data were measured and recorded during road tests in Seoul. The accumulated road test mileage is around 1,300 kilometers. The objective of the study is to identify the driving patterns of the Seoul metropolitan area and to analyze the fuel economy based on these driving patterns. The driving data which was acquired through road tests was analysed statistically in order to obtain the driving characteristics via modal analysis, speed analysis, and speed-acceleration analysis. Moreover, the driving data was analyzed by multivariate statistical techniques including correlation analysis, principal component analysis, and multiple linear regression analysis in order to obtain the relationships between influencing factors on fuel economy. The analyzed results show that the average speed is around 29.2 km/h, and the average fuel economy is 10.23 km/L. The vehicle speed of the Seoul metropolitan area is slower, and the stop-and-go operation is more frequent than FTP-75 test mode which is used for emission and fuel economy tests. The average trip time per kilometer is one of the most important factors in fuel consumption, and the increase of the average speed is desirable for reducing emissions and fuel consumption.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.985-987
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• 2010

본 논문에서는 개인별 평균차를 이용한 최대 엔트로피 기반 감성 인식 모델을 제안한다. 정확하게 사용자의 감성을 인식할 수 있도록, 제안하는 모델은 단순하게 주어진 입력 감성 신호 정보만 분석하여 사용하지 않고, 입력 정보를 각 감성 상태의 평균값과 비교한 결과를 활용한다. 그리고, 자료 부족 문제를 완화하기 위해서, 제안하는 모델은 평균차를 +(양수)와 -(음수)로 단순하게 표현하고, 감성 반응 전체 시간 대신 초단위로 분할하여 감성신호의 평균을 계산한다. 또한, 전문적인 지식이 없이도 구축이 용이하도록, 제안하는 모델은 간단한 평균차 계산 기법과 잘 알려진 기계학습기법의 하나인 최대 엔트로피 모델을 이용한다.

• 대한안전경영과학회지
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• 제5권4호
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• pp.169-185
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• 2003

Recently many researchers contributed to the understanding of Quality Control System, but the use of economics in the design of quality assurance system is limited in treatment of the relationship between the average incoming quality level (or average process quality level) of the incoming lot and the average outgoing quality level of this lot. In this study, a traditional concept of sampling inspection plan for the quality assurance system is extended to a consideration of economic aspects in total production system by representing and analyzing the effects between proceeding and succeeding production process including inspection process. This approach recognizes that the decision at each manufacturing process (or assembly process), is to be determined not only by the cost and the average outgoing quality level of that process, but also by the input parameters of the cost and the incoming quality to the succeeding process. By analyzing the effects of the average incoming and outgoing quality, manufacturing or assembly process quality level and sampling inspection plan on the production system, mathematical models and solution technique to minimize the total production cost for a general product manufacturing system with specified average outgoing quality limit are suggested.

• 대한관절경학회지
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• 제2권1호
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• pp.33-39
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• 1998

This study was done to compare the results of the one-incision technique and the conventional two incision technique for the arthroscopic treatment of the posterior cruciate ligament injury. Fifty-five patients with the posterior cruciate ligament injury underwent the arthroscopic posterior cruciate ligament reconstruction using bone-patellar tendon-bone(BTB) graft. Patients with combined ligament injuries requiring concomitant operative treatment were excluded in this study. The conventional two-incision technique was performed in ten patients(Group I) and the one-incision technique in forty-five patients(Group II). The average duration of follow-up was 45 months in Group I(range, 40 to 50 months) and 36 months in Group II(range, 24 to 68 months). Auto BTB grafts were utilized for all patients in Group I. In Group II, 34 BTB autografts and 11 BTB allografts were utilized. The functional results were evaluated according to the Lysholm Knee Scoring scale and the Hospital for Special Surgery(HSS) knee ligament rating form. The postoperative posterior laxity was measured with a KT 1000 or 2000 arthrometer. Lysholm postoperative mean values were 90.0 in Group I and 90.6 in Group II. HSS mean values were 87.7 in Group I and 92.6 in Group II. HSS postoperative mean value showed better results in Group II(p=0.037). The average side-to-side difference of the posterior translation measured by the KT 2000 arthrometer were 2.10 mm(range, 1 to 4 mm) in Group I and 2.38 mm(range, 0 to 5 mm) in Group II. But there was no statistically significant difference. In Group II, the results of the autograft and allograft showed no significant difference. The arthroscopic posterior cruciate ligament reconstruction using one-incision technique showed good results comparable to the conventional two-incision technique. This technique minimizes potential injury to the extensor mechanism, especially vastus medialis obliquus, and scar formation over the medial femoral condyle. The operation can be finished within one tourniquet time by using only one-incision.

• 전자공학회논문지CI
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• 제42권4호
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• pp.51-58
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• 2005

본 논문에서는 비디오 시퀀스의 자동분류를 지원하기 위한 기반기술로서, 변형된 $\chi^2$-테스트와 자동 임계치-결정 알고리즘을 이용한 장면전환 검출 기법을 제안하였다. 변형된 $\chi^2$-테스트는 기존의 컬러 히스토그램에서 컬러의 각 채널공간(RGB)에 NTSC표준에 따른 명암도 등급을 따로 계산하여 채널의 차이 값을 보다 세분화 할 수 있으며, 인접한 두 프레임사이의 상대적인 컬러 값의 차이를 강조하는$\chi^2$- 테스트를 결합하여 보다 강건한 장면전환 곁출을 시도하고 있다. 자동 임계치-결정 알고리즘은 변형된 $\chi^2$-테스트를 통하여 획득된 인접한 프레임들 사이의 차이 값들을 이용한다. 먼저, 차이 값들에 대한 전체 평균값을 계산한 후, 이 평균값을 만족하는 차이 값들만을 이용하여 다시 평균값을 계산하며, 이러한 평균값의 연속적인 계산 및 누적을 통하여 분산된 차이 값들로부터 가장 최적의 중간 평균값을 취하여 임계치로 설정하는 방법이다. 실험결과 제안된 장면전환 검출 방법과 자동 임계치-결정 알고리즘은 기존의 접근방법보다 효과적이며, 그 우수성을 보여주었다.

• 대한수의학회지
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• 제29권3호
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• pp.325-331
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• 1989

Five hundred and forty-eight samples of pig heart muscle were collected from the abattoirs of many regions in Korea to reveal the frequency of Sarcocystis infections and to identify the species from June 1988 to April 1989. Heart muscle of the pigs was inspected for sarcocysts by the direct detection technique and for bradyzoites by the trypsin digestion technique. For examination of development of the parasites in the final host, 5 cross bred mature dogs, 5 puppies and 5 kittens were fed 100g, 50g and 50g of the infected meat respectively, four times in 2 days. Of 402 fattened and 146 older culled breeding pigs, 3 fattened pigs and 39 culled pigs were positive for Sarcocystis. Sarcocystis cysts from heart muscle measured an average of $425{\times}169{\mu}m$ and bradyzoites an average of $15.6{\times}3.5{\mu}m$. Of 15 animals, only 2 puppies were infected with Sarcocystis. The prepatent period was 11 to 12 days and patent period was not examined since the puppies were infected with some another infections and one died on day 11 and another died on day 12 after ingestion of the meat. The sporulated oocysts were detected 11 days after ingestion of the meat and sporocysts 12 days from the puppy feces. The sporulated oocysts measured an average of $16.5{\times}11.5{\mu}m$ and sporocysts an average of $12.6{\times}7.9{\mu}m$. On scraping examination of the intestinal mucosa, fully sporulated oocysts were detected in the tip of the intestinal villi. Considering above all descriptions, Sarcocystis in pig heart muscle in Korea was identified with Sarcocystis suicanis.