• 수산해양교육연구
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• 제24권2호
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• pp.234-245
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• 2012

This study aims to analyze the factors of the extra-curricula area in personal school performance record and propose the practical strategies for entrance examination affairs on this area. To address this goal, we have applied a SWOT analysis with related documents and research results. We found out five strengths: (S1) Link the students' experience to right people for the university, (S2) Quantitative Indicators, (S3) Qualitative Indicators, (S4) Link to other evaluation factors, and (S5) Analysis of Human Resource. The weakness included: (W1) Fairness, (W2) Reliability, (W3) Difficulties to set standards, (W4) Difficulties to set environments, and (W5) Lack of systemic experience of an evaluation. We also discovered five opportunities (O1) Recognition of public education, (O2) The need of national support, (O3) The importance of autonomy, (O4) Specialization, and (O5) Networks. Finally, threat factors consisted of: (T1) Frequent change of educational policy, (T2) Increasing of private education, (T3) Lack of information and preparation time, and (T4) The accuracy and reliability of personal school records. Based on these results, we suggested practical strategies with these four dimensions: S-O, W-O, S-T, and W-T.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권12호
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• pp.5103-5115
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• 2015

In radar imaging, a target is usually consisted of a few strong scatterers which are sparsely distributed. In this paper, an improved sparse signal recovery algorithm based on smoothed l₀ (SL0) norm method is proposed to achieve high resolution ISAR imaging with limited pulse numbers. Firstly, one new smoothed function is proposed to approximate the l₀ norm to measure the sparsity. Then a single loop step is used instead of two loop layers in SL0 method which increases the searching density of variable parameter to ensure the recovery accuracy without increasing computation amount, the cost function is undated in every loop for the next loop until the termination is satisfied. Finally, the new set of solution is projected into the feasible set. Simulation results show that the proposed algorithm is superior to the several popular methods both in terms of the reconstruction performance and computation time. Real data ISAR imaging obtained by the proposed algorithm is competitive to several other methods.

• 한국전산유체공학회지
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• 제22권1호
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• pp.81-87
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• 2017

The characteristics of flow past a square cylinder submerged under the free surface have been numerically studied. An immersed boundary method was adopted for implementation of the cylinder cross-section in a Cartesian grid system. Also, a level-set method was used to capture the interface of the two fluids. The case for Reynolds number 150 was examined. At the specific Reynolds number, by varying the gap ratio(0.25, 0.40, 0.55, 0.70, 1.00, 1.50, 2.50, 5.00) the effects of the free surface on the force coefficients and Strouhal number of vortex shedding were identified. The presence of the free surface very close to the cylinder significantly affects the shedding pattern, resulting in considerable deviation of the force coefficients and Strouhal number from those of the single-phase flow. In addition, the influence of Froude number was considered in this study. By increasing Froude number(0.2-0.4), flow topology change was identified at the specific gap ratios(0.40, 0.70, 1.50, 5.00).

• 한국CDE학회논문집
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• 제10권3호
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• pp.168-178
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• 2005

The Delaunay triangular net is primarily characterized by a balance of the whole by improving divided triangular patches into a regular triangle, which closely resembles an equiangular triangle. A triangular net occurring in certain, point-clustered, data is unique and can always create the same triangular net. Due to such unique characteristics, Delaunay triangulation is used in various fields., such as shape reconstruction, solid modeling and volume rendering. There are many algorithms available for Delaunay triangulation but, efficient sequential algorithms are rare. When these grids involve a set of points whose distribution are not well proportioned, the execution speed becomes slower than in a well-proportioned grid. In order to make up for this weakness, the ids are divided into sub-grids when the sets are integrated inside the grid. A method for finding a mate in an incremental construction algorithm is to first search the area with a higher possibility of forming a regular triangular net, while the existing method is to find a set of points inside the grid that includes the circumscribed sphere, increasing the radius of the circumscribed sphere to a certain extent. Therefore, due to its more efficient searching performance, it takes a shorer time to form a triangular net than general incremental algorithms.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.378.1-378.1
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• 2014

In this study, we investigated that the resistance switching characteristics of Nb-doped HfO2 films with increasing Nb doping concentration. The Nb-doped HfO2 based ReRAM devices with a TiN/Nb-doped HfO2/Pt/Ti/SiO2 were fabricated on Si substrates. The Nb-doped HfO2 films were deposited by reactive dc magnetron co-sputtering at $300^{\circ}C$ and oxygen partial ratio of 60% (Ar: 16sccm, O2: 24sccm). Microstructure of Nb-doped HfO2 films and atomic concentration were investigated by XRD, TEM, and XPS, respectively. The Nb-doped HfO2 films showed set/reset resistance switching behavior at various Nb doping concentrations. The process voltage of forming/set is decreased and whereas the initial current level is increased in doped HfO2 films. However, the switching properties of Nb-doped HfO2 were changed above the specific doping concentration of Nb. The change of resistance switching behavior depending on doping concentration was discussed in terms of concentration of non-lattice oxygen and micro-structure of Nb-doped HfO2.

• 융합신호처리학회논문지
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• 제6권3호
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• pp.107-111
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• 2005

멀티미디어 사용의 증가에 따라 정보화 사회에 있어 정지영상 정보를 높은 압축율로 방대한 데이터를 얼마나 빠르게 에러 없이 전송 또는 처리하는가 하는 문제가 요구되어지고 있다. 본 논문은 임베디드 시스템 환경의 정지영상 인코팅 분야에서 다양한 기능과 압축 성능을 보이고 있는 JPEG2000의 압축효율 향상을 위하여 양자화 전 단계에서 추출데이터를 축소시켜 EBCOT 단계로 전달되는 데이터의 양을 줄이는 방법으로, 웨이블렛 계수의 저주파 대역에 대한 부호화를 제거하여 부호화 과정에서의 sign bit를 줄이고, 중요도 판별과정에서 각 단계별 임계치를 설정하여 중복비트를 제거하는 분할 정렬 알고리즘을 이용하여 웨이블렛 계수를 줄이는 방법을 제안하였다. 실험결과, 제안한 방법을 통해 임베디드 환경아래에서 기존의 JPEG2000 표준보다 더 우수한 양질의 성능과 저 비트율을 확인할 수 있었다.

• 한국산학기술학회논문지
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• 제13권5호
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• pp.2353-2359
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• 2012

현재 오픈소스 소프트웨어 사용은 날로 증가하고 있는 추세이다. 그러나 오픈소스 소프트웨어 품질에 관한 문제는 그 중요성이 충분히 고려되지 못하고 있는 현실이다. 오픈소스 소프트웨어 품질문제 현황과 지속적인 사용 증가에 대해 전망을 고려할 때 오픈소스 소프트웨어의 품질평가 기술에 대한 개발이 절실히 요구되고 있으나 지금까지의 품질평가 기술 및 국내외 소프트웨어 품질인증 기관의 품질평가 제도는 상용 소프트웨어 제품에 국한되어 있는 것이 현실이다. 따라서 본 논문에서는 오픈소스 소프트웨어를 정량적으로 평가 할 수 있는 평가항목을 구성하였고, 조사된 관련 자료의 통계적인 집계를 통해 평가기준을 확립하였다. 이 평가기준을 통해 오픈소스 소프트웨어를 평가하였다.

• 한국주거학회논문집
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• 제27권4호
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• pp.47-58
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• 2016

As increasing demand for the living environment to promote social health, this study focused on consumers customized rental housing community space. Set the community spatial planning objectives and strategies shown in previous studies to the conceptual model for evaluation of community space. Based on the planning methods and standards of consumers custom community facilities, we analyzed the Seoul consumer customized public rental housing nine cases. Because almost located in the small vacant lot, they had limitations as a base for the local community. Nevertheless, through the arrangement of the building, Child care households increase the chance of contact with the neighbors. In elderly households, welfare facilities strengthen the character of as a base for local community. 1-2 person households situated close to the cultural facilities, by installing a hobby room and gym, was judged to be able to promote the community. Consumer custom rental housing community space evaluation items presented in this study, was set up by analysis of the conceptual model for evaluation of community space and implications of the 9 cases.

• 폴리머
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• 제25권2호
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• pp.233-239
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• 2001

Mechanical mixing법으로 ethylene propylene diene terpolymer (EPDM)과 ethylene propylene diene terpolymer (EPDM)과 acrylonitrile butadiene rubber (NBR) 블렌드 혼련물을 제조하여, 이들의 무늬 점도, 가교 거동, 영구 압축 줄음율 및 동적 기계적 성질 등을 검토하였다. Rheovibron에 의한 동적 특성 측정의 결과로부터 EPDM/NBR 블렌드는 -43$^{\circ}C$ 및 -4$^{\circ}C$ 부근에서 두 개의 전이를 보였으며 이를 각각 NBR 고무 및 EPDM 고무의 T$_{g}$로 해석하였다. tan${\delta}$ 피크의 위치는 NBR 고무의 함량이 증가함에 따라 고온 쪽으로 이동함을 확인할 수 있었다. 또한 NBR 고무량이 증가할수록 최적 가황시간이 단축되는 경향을 보였다.

• 대한안전경영과학회지
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• 제17권4호
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• pp.335-342
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• 2015

The increasing interests on patents have led many individuals and companies to apply for many patents in various areas. Applied patents are stored in the forms of electronic documents. The search and categorization for these documents are issues of major fields in data mining. Especially, the keyword extraction by which we retrieve the representative keywords is important. Most of techniques for it is based on vector space model. But this model is simply based on frequency of terms in documents, gives them weights based on their frequency and selects the keywords according to the order of weights. However, this model has the limit that it cannot reflect the relations between keywords. This paper proposes the advanced way to extract the more representative keywords by overcoming this limit. In this way, the proposed model firstly prepares the candidate set using the vector model, then makes the graph which represents the relation in the pair of candidate keywords in the set and selects the keywords based on this relationship graph.