• 한국컴퓨터정보학회논문지
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• 제25권12호
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• pp.203-210
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• 2020

메모리 기반의 협력 필터링은 추천 시스템의 대표적인 타입이지만 데이터 희소성이라는 본질적인 문제를 갖고 있다. 이 문제를 해결하기 위해 많은 연구 업적들이 이루어졌으나, 보다 체계적인 접근 방법은 여전히 요구된다. 본 연구는 사용자 간의 유사도를 산출하기 위하여 항목들에 대한 사용자 평가치 분포를 활용한다. 따라서 제안 방법은 사용자의 모든 평가치를 이용하므로, 공통 항목에 대한 평가치만을 이용하는 기존 방법들과 대비된다. 더욱이, 각 항목에 대한 다른 사용자들의 평가치들을 유사도 계산에 반영함으로써 항목 평가치의 광역적인 관점을 취한다. 제안 방법의 성능은 실험을 통하여 평가하였고, 연관된 다른 방법들과 비교하였다. 그 결과, 제안 방법은 예측과 순위 정확도 측면에서 우수한 성능을 보였다. 이러한 예측 정확도의 향상은 전통적인 유사도 척도에 비해 최근의 방법으로 달성한 것보다 최고 2.6배 더 높다.

• 한국컴퓨터정보학회논문지
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• 제27권1호
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• pp.83-89
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• 2022

협력 필터링은 추천 시스템의 대표적인 기법으로서 많은 상업 및 학계 시스템에서 성공적으로 구현되어 서비스되고 있다. 이 기법은 두 사용자 간의 공통 평가 항목에 대한 평가치의 유사성을 기반으로 유사한 이웃 사용자들이 높은 평가치를 부여한 항목들을 추천한다. 최근 사용자들의 항목 평가 시각을 반영하여 시스템 성능을 향상시키려는 시각 인지 추천 시스템 연구가 진행되고 있다. 그러나, 과거 평가치에 대한 일률적인 감쇠율은 시스템의 평가치 예측 성능을 저하시킬 우려가 있다. 본 연구에서는 기존과 다른 접근 방식으로서 평가 시각 인지 기반의 사용자 간 유사도 척도를 제안한다. 이 방법은 항목 평가 시각이 아닌 유사도값의 시간에 따른 변화를 고려한다. 제안 방법의 성능 평가를 위해 다양한 파라미터값과 시간 변화 함수 종류에 대하여 실험 평가를 진행하였으며, 기존의 전통적인 유사도 척도들의 예측 성능을 크게 향상시키는 결과를 나타냈다.

• 대한간호학회지
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• 제52권6호
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• pp.564-581
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• 2022

Purpose: This study aimed to evaluate the validity and reliability of the Korean version of the Readiness for Practice Survey (K-RPS). Method: The English Readiness for Practice Survey was translated into Korean using the Translation, Review, Adjudication, Pretesting, and Documentation (TRAPD) method. Secondary data analysis was performed using the dataset from the New Nurse e-Cohort study (Panel 2020) in South Korea. This study used a nationally representative sample of 812 senior nursing students. Exploratory and confirmatory factor analyses were also conducted. Convergent validity within the items and discriminant validity between factors were assessed to evaluate construct validity. Construct validity for hypothesis testing was evaluated using convergent and discriminant validity. Ordinary α was used to assess reliability. Results: The K-RPS comprises 20 items examining four factors: clinical problem solving, learning experience, professional responsibilities, and professional preparation. Although the convergent validity of the items was successfully verified, discriminant validity between the factors was not. The K-RPS construct validity was verified using a bi-factor model (CMIN/DF 2.20, RMSEA .06, TLI .97, CFI .97, and PGFI .59). The K-RPS was significantly correlated with self-esteem (r = .43, p < .001) and anxiety about clinical practicum (r = - .50, p < .001). Internal consistency was reliable based on an ordinary α of .88. Conclusion: The K-RPS is both valid and reliable and can be used as a standardized Korean version of the Readiness for Practice measurement tool.

• 대한간호학회지
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• 제53권3호
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• pp.359-369
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• 2023

Purpose: This study evaluated the internal structure (structural validity, internal consistency, and measurement invariance) of the Health-Related Quality of Life Instrument with Eight Items (HINT-8), developed to measure Korean people's health-related quality of life. Methods: A secondary analysis was conducted using data from the Korea National Health and Nutrition Examination Survey, involving 6,167 adults aged over 18 years. The structural validity of the HINT-8 was assessed using exploratory graph analysis and confirmatory factor analysis. Internal consistency and measurement invariance were analyzed using McDonald's omega (ω) and multigroup confirmatory factor analysis, respectively. Results: The HINT-8 had a single dimension and good internal consistency (ω =.804). The one-dimension HINT-8 exhibited matric invariance but not scalar invariance across sociodemographic groups (sex, age, education, and marital status). Further, it exhibited scalar or partial scalar invariance across medical condition groups (hypertension, diabetes, depressive symptoms, and cancer). Conclusion: The study finds that the HINT-8 demonstrated satisfactory structural validity and internal consistency, indicating its suitability for practice and research. However, the HINT-8 scores cannot be compared across different groups regarding sex, age, education, and marital status, as the interpretation varies within each sociodemographic category. Conversely, interpretation of the HINT-8 is consistent for individuals with and without hypertension, diabetes, depressive symptom, and cancer.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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• pp.251-260
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• 2000

Seismic performance evaluation systems require rational classification of structure systems, proper evaluation criteria, and their scoring index for synthesis. Current seismic performance systems need expert judgments based on collection of available data, approximate analysis of important items, and various scoring system. This study presents a three-step seismic performance evaluation system for building structures in Korea. Each evaluation step determines the seismic performance and the method depends on the degree of refinement of analysis. The preliminary step evaluation involves the global attributes of structures such as vertical irregularity, asymmetric plan, redundancy, and age of structures. The second step requires an elastic analysis for estimation of forces acting on critical sections and checks the strength and ductility. The final step requires inelastic capacity of structures. Each stephas own evaluation scheme with proper weighing factor dependent on the importance and consequence. This study applies the fuzzy theory to a scoring method that synthesizes the individual quantity to a representative value.

• Advances in aircraft and spacecraft science
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• 제5권2호
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• pp.239-249
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• 2018

Physical tests are performed at various stages of the development cycle of a product, from prototype validation to product qualification. Although costly, there are growing demands for qualification tests like endurance vibration testing to be more representative of the real world. At the same time there are growing demands to assess the durability of these items based on FEA simulation. In this paper, we will explain how to set up a CAE-based test and how to correlate the results with some physical measurements. Specific assumptions will be explained and some advantages of using virtual tests will be highlighted such as the reduction of the number of prototypes needed, investigations on failures, evaluation of the level of reliability via sensitivity analysis, evaluation of the margins are at the end of a successful test. This presentation will therefore focus on explaining and showing how virtual tests can enrich the exploitation of physical tests.

• 한국언어정보학회지:언어와정보
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• 제4권2호
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• pp.107-124
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• 2000

This paper reports the syntactic distribution of amu-N-to/-ilato/-ina phrase, which are representative polarity sensitive items. (PSIs) in Korean, and ac- counts for their semantic characteristics in therms of "arbitrary choice quantification" and "concession" In the first section, we extensively illustrate the distributional behaviour of the PSIs in various costructions and roughly generalize the distribu- tion in terms of "(anti/non-) verdicality" Section 2 claims amu denotes an arbi- trary choice quantifier and the particles -to/-ilato/-ina as "concessive" markers, so the compounds denote a special element in a pragmatic scale determined by con- text/situation, Section 3. based on the pragmatics of scalar implicature, accounts for the apparent ambiguity of PSIs between "universal"and "existential"readings and further characterizes the difference among the concessive markers -to/-ilato/-ina in terms of "quantity/ quality scale."rkers -to/-ilato/-ina in terms of "quantity/ quality scale."

• Journal of information and communication convergence engineering
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• 제14권3호
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• pp.191-199
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• 2016

In this study, we investigate the safety requirements and test methods of a radiofrequency stimulator. The main test items include controls of a minimum output, accommodation range, and output parameters that have been known as the safety requirements in conformity with international standards. As the test criteria for controlling the minimum output, an increase or decrease in a unit of 1 mA or 1 V or less was applied to the output amplitude regulator for both continuous and discontinuous control, and the output at the minimum setting was manipulated to not exceed 2% of the maximum setting. For controlling the output parameters, one of the representative test criteria states that the current limit of 250 mA should be equal to or less than 1,500 Hz. Consequently, when applying the radiofrequency stimulator on the human body, we need to ensure that the safety requirements conform to the international standards.

• 한국도서관정보학회지
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• 제27권
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• pp.369-389
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• 1997

KDC(Korea Decimal Classification), which is representative literature classification scheme in Korea, was revised and published in 1996. The purpose of this paper is to suggest a reform measure after detecting out issues and problems associated with the KDC 4th ed. through the result of lecture. The outline of suggestions are as follows : (1) There are not all items of auxiliary tables in relative index. (2) Auxiliary table 2 (Geographic Areas) is not detailed. (3) The manual for the shake of efficient usage is nonexistent and notes are poor in content. (4) Sufficient minimax and alternatives must be setted up for efficiency usage. (5) Some parts of the main schedule are disorder and not logical.

• 한국콘텐츠학회논문지
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• 제6권10호
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• pp.80-88
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• 2006

MMORPG에 대한 분석틀을 제시하고, 이 분석틀을 이용하여 대표적인 3개의 게임에 대하여 분석하여 보았다. 분석틀은 커뮤니티성, 피케이용이성, 아이템 이용 용이성, 캐릭터 다양성, 밸런스, 편의성, 심미성의 7개 항목을 가지는 것으로 그 안에서 세부적으로 다시 구체적인 조사항목이 정해진다. 이러한 분석틀을 이용한 분석 결과 리니지와 와우는 분야별 특성이 매우 대별되는 것으로 나타났으며 라그나로크는 두 게임의 중간 정도에 해당하는 특성을 보여주었다.