• 한국군사과학기술학회지
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• 제10권3호
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• pp.129-138
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• 2007

Recently, Direction Finding(DF) System is using switching DF algorithm to reduce system-weight by eliminating RF cable as much as possible. Also, Correlation Vector Direction Finding(CVDF) algorithms is being used for Fast Direction finding in tactical environment. In this paper, I will give you burst error elimination algorithms and compare the performance in case we use switching CVDF algorithm. Although antenna array is not working, we will successfully perform direction finding when we use this burst error elimination algorithms. Also, we will be completely capable of DF mission despite of meeting the unwanted situation that the monitoring signal disappear in case we use Switching Direction Finding algorithms. That situation frequently occurs under the Frequency Hopping signal circumstances.

• Journal of applied mathematics & informatics
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• 제29권3_4호
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• pp.529-546
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• 2011

A deterministic tuberculosis model for theoretically assessing the potential impact of the combined effects of case detection in the presence of treatment is formulated. The qualitative features of its equilibria are analyzed and it is found that the disease-free equilibrium may not be globally asymptotically stable when the reproduction number is less than unity. This disease threshold number is further used to assess the impact of active TB case finding alone and in conjunction with treatment. A critical threshold parameter ${\Theta}$ say for which case detection will have a positive impact is derived. Using the Centre Manifold theory, the model may exhibit the phenomenon of backward bifurcation (coexistence of a locally stable endemic equilibrium with a stable disease-free equilibrium) when the reproduction number is less than unity. It is shown that the possibility of backward bifurcation occurring decreases with increase case detection. Graphical representations suggest that increase in case finding accompanied by treatment of detected TB cases, result in a marked decrease of TB cases (both latent and active TB).

• 대한교통학회지
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• 제14권1호
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• pp.51-67
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• 1996

The optimal path-finding problem becomes complicated when multiple variables are simultaneously considered such as physical route length, degree of congestion, traffic capacity of intersections, number of intersections and lanes, and existence of free ways. Therefore, many researchers in various fields (management science, computer science, applied mathematics, production planning, satellite launching) attempted to solve the problem by ignoring many variables for problem simplification, by developing intelligent algorithms, or by developing high-speed hardware. In this research, an integration of expert system technique and case-based reasoning in high level with a conventional algorithms in lower level was attempted to develop an optimal path-finding system. Early application of experienced driver's knowledge and case data accumulated in case base drastically reduces number of possible combinations of optimal paths by generating promising alternatives and by eliminating non-profitable alternatives. Then, employment of a conventional optimization algorithm provides faster search mechanisms than other methods such as bidirectional algorithm and $A^*$ algorithm. The conclusion obtained from repeated laboratory experiments with real traffic data in Seoul metropolitan area shows that the integrated approach to finding optimal paths with consideration of various real world constraints provides reasonable solution in a faster way than others.

• 한국군사과학기술학회지
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• 제11권6호
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• pp.63-73
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• 2008

The helicopter position, heading data and the direction finding data of ESM are essentially required to compensate the parallax and analyze the direction finding accuracy of heliborne ESM in flight test phase. In the case of the long test range compared with small platform like as LYNX helicopter and Jisim Island test site, the parallax compensation for direction finding accuracy calculation and GPS position error can be neglected. In this paper, the direction finding accuracy on the basis of helicopter propeller was calculated by coordinate changing between helicopter and transmitting antenna from WGS84 coordinate to navigation coordinate using helicopter position and direction finding data.

• 농촌계획
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• 제13권2호
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• pp.75-84
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• 2007

Rural amenity resources show a particular rural community's identity. They also provide recreational, aesthetic and economic value. This research aimed at systematizing finding surveying techniques of rural amenity resources for planning rural community. For conducting the study, existing finding and surveying techniques of rural amenity resources in the case of comprehensive Amenity Planning of Seochen County in Choongcheongnam Province. The research findings are as followings; (1) 190 amenity resources were found in Seochen County, (2) archival research and interview methods were used for finding resources, (3) the present status and maintenance conditions were examined through on-the-spot survey, (4) resources were photographed and recorded by making descriptive notes verbally and diagrammatically.

• Korean Journal of Mathematics
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• 제20권2호
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• pp.247-254
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• 2012

The Klee-Quaife problem is finding the minimum order ${\mu}(d,c,v)$ of the $(d,c,v)$ graph, which is a $c$-vertex connected $v$-regular graph with diameter $d$. Many authors contributed finding ${\mu}(d,c,v)$ and they also enumerated and classied the graphs in several cases. This problem is naturally extended to the case of digraphs. So we are interested in the extended Klee-Quaife problem. In this paper, we deal with an equivalent problem, finding the maximum diameter of digraphs with given order, focused on 2-regular case. We show that the maximum diameter of strongly connected 2-regular digraphs with order $n$ is $n-3$, and classify the digraphs which have diameter $n-3$. All 15 nonisomorphic extremal digraphs are listed.

• 대한가정학회지
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• 제35권6호
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• pp.191-203
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• 1997

This paper is study the ways of finding sexual abuse facts of children at home and the standards of recognizing such facts. The investigation and recognition about sexual abuse of children are necessary for remedy or care of children and their family and also for punishment upon the harmer or sanction against him by family laws. But, on account of the characteristics of sexual abuse acts and the standpoint that sufferers are children, it's very difficult to find those kinds of facts. Medical examinations, observations by specialists behavioral indicators, use of dolls & other props, and interviewing are applied to finding sexual abuse facts of children. However, these investigating methods have many uppermost limits, and don't necessarily have conformable conclusions. especially 'interviewing' is essentially used to find a child who has suffered sexual abuses and to investigate and examine a harmer who has been charged with such sexual acts. but 'interviewing' has no less obstacles in reality than has some utilities. For that reason, a follow-up study of (what is) the most effective method is required, with the case=by-case application of other methods. And along with that, it must be taken into consideration that, in process of finding a sexually abused child and in ex post facto measure against accompanying ill effects, the child's protection and the family's privacy ought to be legally guaranteed. So to speak, in making and enforcing the family laws, a profound study of the family to produce good fruits must be made.

• 한국정보통신학회논문지
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• 제7권3호
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• pp.437-447
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• 2003

Circulant Matrix Factorization (CMF)는 covariance 행렬의 spectral factorization된 결과를 얻을 수 있다. 우리는 얻어진 결과를 가지고 일반적으로 잘 알려진 방법인 Schur algorithm을 이용하여 finite impulse response(FIR)와 infinite impulse response (IIR) lattice 필터를 설계하는 방법을 제안하였다. CMF는 기존에 많이 사용되는 root finding을 사용하지 않고 covariance polynomial로부터 minimum phase 특성을 가지는 polynomial을 얻는데 유용한 방법이다. 그리고 Schur algorithm은 toeplitz matrix를 빠르게 Cholesky factorization하기 위한 방법으로 이 방법을 이용하면 FIR/IIR lattice 필터의 계수를 쉽게 찾아낼 수 있다. 본 논문에서는 이러한 방법들을 이용하여 FIR과 IIR lattice 필터의 설계의 계산적인 예제를 제시했으며, 제안된 방법과 다른 기존에 제시되었던 방법 (polynomial root finding과 cepstral deconvolution)들과 성능을 비교 평가하였다.

• Imaging Science in Dentistry
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• 제52권3호
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• pp.319-326
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• 2022

This report presents the case of a 5-year-old boy with a hard swelling on the right side of the mandible body. An important point of this case is that the primary imaging finding was fine spicules in the inferior border of the mandible on panoramic radiography without significant changes in bone density. Cone-beam computed tomography views revealed a lytic lesion on the lingual side of the right mandibular body with the destruction of the lingual cortex and periosteal reaction from the midline to the first molar area. Careful attention to this radiographic finding in the primary stage in the absence of other significant imaging findings, particularly in children, could result in the early diagnosis of desmoplastic fibroma. Therefore, a better prognosis can be expected following early surgical treatment.

• 한국학교수학회논문집
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• 제15권1호
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• pp.155-169
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• 2012

본 연구는 최석정이 제시한 지수용육도와 지수귀문도의 수학사 탐구형 스토리텔링을 위한 소재로서의 가능성을 탐색하고 있다. 학생들은 최석정이 제시한 지수용육도와 지수귀문도의 해로부터, 기댓값을 마법수로 택했고, 서로 보수가 되는 두 수의 쌍을 이용했고, 다른 쌍의 배열에 영향을 미치지 않는 독립된 네 쌍이 있고, 보수가 되는 두 수를 바꾸어 놓아도 역시 해가 된다는 특징을 탐구할 수 있다. 다음으로 학생들은 지수용육도의 해를 구하는 것은 특정한 조건을 만족하는 6개의 수를 찾는 것으로, 그리고 지수귀문도의 해를 찾는 것은 특정한 조건을 만족하는 11개의 수를 찾는 것으로 바꾸어 탐구할 수 있다. 또한 학생들은 이 전략을 통해 많은 시행착오를 겪지 않아도 최석정 스타일의 해를 나름대로 다양하게 구할 수 있다는 것을 알 수 있다.