• 대한치과의사협회지
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• 제56권12호
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• pp.707-713
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• 2018

Multiple myeloma is a lymphohematopoietic disorder leading to abnormal hemostasis and significant pathologic changes of skeletal system. It induces multiple circular or oval-shaped radiolucent lesions which are characterized by 'punched-out appearance'. The surrounding trabecular bone normally shows no significant sclerotic reaction. Multiple myeloma patients may visit dental clinics, without perception of the disease themselves, due to discomfort from edema of orofacial region, oral ulcers, tooth mobility, pain or gingival bleeding. Multiple myeloma is susceptible to various complications, including delayed hemostasis and infection, which could occur during routine dental treatment such as periodontal and surgical operation. For radiographic diagnosis of multiple myeloma, common radiologic features of this tumor could be visualized by panoramic radiographs in the dental clinics, and further medical examinations and treatment can be recommended as a result.

• ETRI Journal
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• 제44권5호
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• pp.826-836
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• 2022

Signal decomposition is a computational technique that dissects a signal into its constituent components, providing supplementary information. In this study, the capability of two common signal decomposition techniques, including wavelet-based and empirical mode decomposition, on preterm birth classification was investigated. Ten time-domain features were extracted from the constituent components of electrohysterogram (EHG) signals, including EHG subbands and EHG intrinsic mode functions, and employed for preterm birth classification. Preterm birth classification and anticipation are crucial tasks that can help reduce preterm birth complications. The computational results show that the preterm birth classification obtained using wavelet-based decomposition is superior. This, therefore, implies that EHG subbands decomposed through wavelet-based decomposition provide more applicable information for preterm birth classification. Furthermore, an accuracy of 0.9776 and a specificity of 0.9978, the best performance on preterm birth classification among state-of-the-art signal processing techniques, were obtained using the time-domain features of EHG subbands.

• 충청수학회지
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• 제7권1호
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• pp.1-11
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• 1994

The theory of inverse semigroups has many features in common with the theory of groups. Many different properties of semigroup become the same condition on ring. In this paper, we want to find the properties of semigroups which is preserved by the properties of ring. Also we find that many different properties become the equivalent conditions.

• 방재기술
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• 통권19호
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• pp.29-35
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• 1995

This decument, translated and rearranged deseribes the features of dust explosion and the factors which have an important effect upon the hazard of dust explosion on the purpose of prevention the disaster caused by dust explosion. The dust explosion exist close to our common life as latently, but it seems to be overlooking in com-mon, regretably Tr need to be evoked.

• 한국조경학회지
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• 제34권2호
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• pp.57-71
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• 2006

The purpose of this study was to find common characteristics in everyday landscape cognition that the residents share and to restore the resulting characteristics through citizen-participatory town design. Through the residents participatory workshop supported by the Gwangju Buk-gu District Autonomy and Citizen Academy of Gwangju YMCA, 304 people from eight administrative districts participated in three programs. In each program, photographed landscape images representing everyday conditions of the townscape were presented in several ways: in program 1, the residents' mental map was studied; in program 2, landscape images of real places were matched to locations on a map; and in program 3, the landscapes were scored on a scale from 1 to 5 according to five descriptive categories. The elements that were recognized as common landscape features were public facilities, pedestrian spaces, school areas, and parks and natural green spaces. Additional results including recognition of the participants affection for the village and a common landscape image shared by the people, as inhabitants looked around at the space of their own lives. It seems possible that more creative townscapes can be created by residents through participatory programs.

• KIEAE Journal
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• 제9권2호
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• pp.9-16
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• 2009

Modern public museums are expanding its role as general cultural facilities. Therefore, the museums that are equipped with convenient and physical environmental features for all ages and types of users are needed. The purpose of this research is to evaluate the application of universal design in common space of the museums and to recommend a set of environmental improvement plans based on which various types of users can decide their choice of museums based on available data on the museums. The scope of this research was limited to seven major public museums located in Seoul, Korea. The spatial scope that was set for this research was common space of the public museums and the scope of the content was about the applicability of universal design. As a result of the research, three major conclusions were reached. First, the application of universal design toward common space in the public museums currently was not prevalent. Second, constant management and application development of universal design are needed. Third, as museums' primary roles and functions become more diverse, a direct application of delicate universal design is a necessary prerequisite to accommodate and fulfill users' needs.

• 항공우주기술
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• 제8권2호
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• pp.170-178
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• 2009

위성 개발 및 운영의 주체가 달라서 이중으로 소모되는 에너지를 줄이기 위해 공통지상 시스템의 통합 개발이 절실히 필요하다. 위성의 개발, 시험, 통합, 발사, 궤도 운영, 임무 수행의 전주기를 아우르는 공통지상시스템을 개발하기 위해서는 모든 단계에서 사용될 수 있는 언어를 개발해야 한다. 이를 위해 위성 시험운영언어의 유럽표준인 PLUTO와 가장 대표적인 언어중 하나인 STOL과 ELISA 및 PIL과 현재 항공우주연구원 AIT의 위성 시험 언어인 ATS와 지상국 운영시스템인 MCE를 자세히 분석하고, 이를 토대로 통합 절차서 언어 개발을 위한 설계 요건들을 제안한다.

• 치과방사선
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• 제22권2호
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• pp.195-201
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• 1992

The authors evaluated the distribution of the antral pathologic conditions and their radiographic features on the Waters' radiolgraphs of 151 children patients who had been radiographed at the department of Oral Radiology, Seoul National University Hospitals. The obtained results were as follows: 1. The most common pathologic condition was inflammatory change(58%). Percentage of cases showing cystic lesion and fibro-osseous lesion were 25% and 11% respectively. 2. In cases of inflammatory change, odontogenic origins were 12 cases(13%) and bilateral occurrences were 37 cases(39%). 3. The most common radiographic feature of the inflammatory conditions was various types of mucosal thickenkng(78%).Percentage of cases showing totally increased radiopacity was 18%. 4. Intrinsic cystic lesions were 26 cases(65%) and dentigerous cyst was the most common extrinsic cyst. 5. Most of the fibro-osseous lesions(15 from 17 cases) were fibrous dysplasia. 6. Maxillary sinus hypoplasia(5 cases) and Burkitt's lyphoma(4 cases) were also observed.

• Journal of the Korean Data and Information Science Society
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• 제19권3호
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• pp.751-759
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• 2008

Mixtures of factor analyzers(MFA) is useful to model the distribution of high-dimensional data on much lower dimensional space where the number of observations is very large relative to their dimension. Mixtures of common factor analyzers(MCFA) can reduce further the number of parameters in the specification of the component covariance matrices as the number of classes is not small. Moreover, the factor scores of MCFA can be displayed in low-dimensional space to distinguish the groups. We propose the factor scores of MCFA as new low-dimensional features for classification of high-dimensional data. Compared with the conventional dimension reduction methods such as principal component analysis(PCA) and canonical covariates(CV), the proposed factor score was shown to have higher correct classification rates for three real data sets when it was used in parametric and nonparametric classifiers.

• 품질경영학회지
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• 제46권2호
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• pp.311-326
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• 2018

Purpose: Using international specifications, this study classified international standards and automobile manufacturers' test items based on the kind of test used and determined the test order for ISO 16750. Methods: The effects of international standards' environmental factors were examined, based on the major impacts of the product and the results of product failure. Automobile manufacturers' test items were compared with the test item in the ISO 16750. A generic algorithm was then used to determine the test sequence for ISO 16750. Results: International standards and automobile manufacturers' common test items were classified. The test sequence of ISO 16750 was determined for five cases. Conclusion: Although mechanical and environmental tests share many common features, there are differences in the details of the tests. There is a common sequence of tests, but weights are allocated tests differently.