• 동력기계공학회지
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• 제14권3호
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• pp.33-38
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• 2010

Technology of vehicle industry has been developing and it is required a better vehicle performance than before. Therefore, the consumers are asking not only an economic efficiency, functionality, polished design, ride comfort and silence but also a driving stability. The ride comfort, silence and driving stability are influenced by the size of vehicle and various facilities. But the principal factor is a room noise and vibration sensed by a driver and passenger. Thus, the NVH of vehicle has been raised and used as a principal factor for evaluation of vehicle performance. The primary objective of this study is an optimized design of powertrain mounting system. To optimized design was applied MSC.Nastran optimization modules. Results of dynamic analysis for powertrain mounting system was investigated. By theses results, design variables was applied 12 dynamic spring constant. And the weighting factor according to translational displacement and rotational displacement applied 3 cases. The objective function was applied to minimize displacement of powertrain. And the design variable constraint was imposed dynamic spring constant ratio. The constraint of design variable for objective function was imposed bounce displacement for powertrain.

• 한국컴퓨터정보학회논문지
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• 제15권4호
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• pp.1-9
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• 2010

Web 2.0으로 불리는 새로운 세대의 웹에서, 블로그를 통하여 누구나 손쉽게 정보나 의견을 세상에 알릴 수 있게 되었고 이러한 블로그를 효과적으로 검색하기 위해서 블로그의 특성을 고려한 검색 알고리즘들이 새롭게 제안이 되고 있다. 그러나 실제 블로그 검색 시스템에 적용된 키워드 기반 검색이나 블로그간의 링크 분석을 통한 랭킹만으로는 사용자가 기대하는 성능을 발휘하지 못한다. 본 논문에서는 검색 결과를 향상시키기 위해 블로그 글과 검색어와의 연관성을 고려한 주제어 가중치 기반의 블로그검색 시스템을 제안한다. 제안된 시스템은 블로그 글 마다 주제어(Topic)를 추출하여 색인어보다 더 높은 가중치를 부여한다. 기존 시스템과의 비교에서 제안된 방법이 실제 검색 결과에서 재현율이 향상됨을 알 수 있었다.

• 대기
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• 제24권2호
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• pp.235-243
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• 2014

Sources of aviation turbulence vary through the seasons, especially in the East Asia including Korean peninsula, associated primarily with the changes in the jet/front system and convective activities. For this reason, a seasonal Korean aviation Turbulence Guidance (KTG) system (seasonal-KTG) is developed in the present study by using pilot reports (PIREPs) and analysis data of the operational Unified Model (UM) of the Korea Meteorological Administration (KMA) for two years between June 2011 and May 2013. Twenty best diagnostics of aviation turbulence in each season are selected by the method of probability of detection (POD) using the PIREPs and UM data. After calculating a weighting value of each selected diagnostics using their area under curve (AUC), the 20 best diagnostics are combined with the weighting scores into a single ensemble-averaged index by season. Compared with the current operational-KTG system that is based on the diagnostics applying all seasons, the performances of the seasonal-KTG system are better in all seasons, except in fall.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 B
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• pp.657-659
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• 1998

In order to optimize fuzzy modeling of nonlinear system, we proposed a optimal fuzzy model according to the characteristic of I/O relationship, HCM method, the genetic algorithm, and the objective function with weighting factor. A conventional fuzzy model has difficulty in definition of membership function. In order to solve its problem, the premise structure of the proposed fuzzy model is selected by both the partition of input space and the analysis of input-output relationship using the clustering algorithm. The premise parameters of the fuzzy model are optimized respectively by the genetic algorithm and the consequence parameters of the fuzzy model are identified by the standard least square method. Also, the objective function with weighting factor is proposed to achieve a balance between the performance results for the training and testing data.

• 한국전자통신학회논문지
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• 제8권10호
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• pp.1451-1456
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• 2013

본 논문은 고유값분석을 이용하여 주파수영역 독립성분석(FDICA)의 수렴속도를 증가시키기 위한 기법을 제안한다. 소나 시스템 등에서는 지연정보를 획득하여 간섭신호원을 빠른 속도로 제거하는 알고리즘이 중요하다. 두 개의 독립신호가 $2{\times}2$ 지연 혼합된 경우에 대한 고유값 분석을 통하여, 초기값 파라미터로 사용할 지연정보를 획득할 수 있다. 본 알고리즘을 검증하기 위한 컴퓨터 시뮬레이션은 수렴속도와 잡음제거에서의 성능향상을 보여준다. 초기조건이 목표값에 근접하고 있기 때문에 3회 정도의 반복수렴 실험으로도 잡음제거에 상당한 성능을 나타낸다. 수렴 후에도 기존 알고리즘보다 1~3dB 더 나은 잡음제거 성능을 볼 수 있다.

• 동의생리병리학회지
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• 제25권1호
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• pp.149-153
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• 2011

In this study, we structuralized the diagnostic indices used for pattern identification (PI) of stroke, and suggested an AHP method to obtain the weights of PI indices. AHP of the subjects under consistency ratio 0.1 showed that the critical indices for stroke PI consists of 9 for Qi-deficiency, 13 for Phlegm/dampness, 7 for blood stagnation, 12 for Yin-deficiency and 16 for Fire/heat. Furthermore, AHP analysis rendered the weights of indices of each PI that will be useful for oriental medical experts to perform objective PI.

• 한국군사과학기술학회지
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• 제13권4호
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• pp.528-533
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• 2010

This paper describes a calculation method of source level of a ship transient noise, which is one of the important elements for the ship detection. Aim of transient noise measurements is to evaluate of acoustic energy due to singular occurrence, which is therefore defined as non-periodic and short termed events like an attack periscope, a rudder and a torpedo door. In generally, in the case of randomly spaced impulse, the spectrum becomes a broadband random noise with no distinctive pattern. Therefore, frequency analysis is not particularly revealing for type of signal. In the paper, it is performed in time domain to analyze a transient noise. However, a source level of transient noise is required an investigation for multiple frequency band. So, in order to calculate a source level of transient noise, a design of exponential weighting function, convolution, band pass filtering, peak detection, root mean square, and parameter compensation are applied. The effectiveness of this calculation scheme is studied through computer simulations and a sea test. Furthermore, an application of the method is applied in a real case.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제5권5호
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• pp.611-618
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• 1999

원하는 정보에 대한 빠르고 정확한 접근은 정보화 사회를 살아가는 현대인들에게 성공의 여부를 결정짓는 중요한 요소가 되었다. 지금까지 대용량의 문서를 효율적으로 검색할 수 있는 정보 검색 시스템에 관한 많은 개발이 이루어져 왔다. 그러나, 연구용으로 자유롭게 이용될 수 있는 시스템들의 대부분이 영문 정보 검색 시스템으로 국한되어 있으며, 한영 혼용 정보 검색 시스템의 개발은 미흡한 실정이다. 본 연구에서는 영문 정보 검색 시스템 freeWAIS-sf를 분석하고, 한글 형태소 분석기 HAM을 이용하여 freeWAIS-sf를 한글화하였다. 또한 freeWAIS-sf의 가중치 기법을 변경하고, 변경된 가중치 기법이 보다 높은 검색 효과를 제공함을 실험을 통하여 입증하였다.

• Journal of Chest Surgery
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• 제27권8호
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• pp.650-655
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• 1994

The author analyzed 99patients with VSD weighting less than 10kg of body weight who underwent surgical correction from 1981 to 1992 at cardiovascular department of Hanyang University hospital. Patients occupied 29.3% of total cases who were underwent surgical corrections for congenital heart diseases during that time. Of the 99 patients, 51 patients were male [52%] and 48 patients[48%] were female. Age ranged from 28 days to 36 months with mean age of 13.6 months. Mean body weight was 7.53kg. According to Kirklin`s anatomical classification, type II defect was most common [61.6%]. Associated anomaly was found in 48 patients [48.5%]. Patent foramen ovale was most commonly associated cardiac anomaly [14.1%] and followed by atrial septal defect [12.1%], patent ductus arteriosus [10.1%]. Cardiac catheterization data were analyzed. The most common range of Qp/Qs, Rp/Rs, Pp/Ps were above 3.0, 0.1 - 0.25, and above 0.75 respectively. Among the indications of surgical correction, there were pulmonary hypertention in 69 patients, congestive heart failure in 44 patients, frequent respiratory infection in 47 patients, growth retardation in 33 patients. The most common surgical approach and method for VSD closure were right atriotomy[48.3%] and dacron patch closure[93.3%]. Complication rate was 13.1% [13 cases], and overall mortality was 17.1% [17 cases]. The cause of death consisted of low cardiac output syndrome[11 cases], acute renal failure[3 cases], sepsis[2 cases] and pulmonary insufficiency[1 case] in order of frequency.

• 에너지공학
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• 제8권4호
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• pp.612-620
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• 1999

환경영향평가는 전과정평가(Life Cycle Assessment : LCA)의 인벤토리 분석과정에서 규명된 환경부하의 값으로 표현하고 상대적인 중용도를 측정하는 단계이다. 이러한 가중치를 측정하므로서 개별제품 또는 기술에 대한 환경부하의 영향을 평가하는데 이용될 수 있다. 본 연구에서는 환경영향평가에 대한 분석에서 환경부하의 상대적인 중요도 혹은 가중치를 산출하기 위하여 일반적으로 이용되는 계층적 의사결정모형(Hierarchical decision model)의 한계인 요인들간의 독립성을 극복할 수 있는 즉, 의사결정요인간 상호영향력을 가지는 네트워크 구조(Network decision model)에서도 사용될 수 있는 의사 결정모형( Analytic Network Process : ANP)을 도입한다. ANP로부터 얻어지는 각 의사결정요인의 가중치는 환경부하의 수준을 결정하는데 용이하게 이용할 수 있다.