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GBAS 기준국의 코드 반송파 발산 검출성능 평가를 위한 통계시험
윤영선(Youngsun Yun),김주경(Joo Kyoung Kim),조정호(Jeongho Cho),허문범(Moon-Beom Heo),남기욱(Gi-Wook Nam) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.9
GBAS 기반의 정밀 접근 서비스를 제공하기 위해서 항행 서비스 제공 주체는 GBAS 시스템의 성능이 국제 표준에 정의된 요구 조건을 만족하는지를 확인하여 사용 승인을 획득하여야 한다. 특히 항공기 안전에 직접적으로 영향을 미치는 무결성 성능의 검증을 위해서는 무결성 위협요인 정의와 검출기법 분석 및 구현된 시스템의 검출성능 평가 등의 작업이 시스템 제작자에 의하여 수행되어야 한다. 본 논문에서는 GBAS 무결성 위협요인 중 코드 반송파 발산 현상에 대응하기 위하여 KIMS 소프트웨어에 구현된 검출기법들의 검출 성능 확인 통계시험 결과를 기술한다. 성능 확인을 위하여 개발된 분석 및 통계시험 절차를 소개하며, 절차에 따른 분석 결과 및 시험 시나리오 제작 방법, 수행된 시험의 결과를 분석하였다. 시험 결과 KIMS 소프트웨어에 구현된 검출기법들은 예측된 최소 검출가능 오차와 같은 크기의 발산이 발생하였을 때, 각 기법에 할당된 고장검출실패율 요구 조건을 만족하며 위협요인을 검출해 낼 수 있는 것을 확인하였다. In order to provide precision approach service based on GBAS, air navigation service providers should validate the GBAS system performance against international standard requirements and receive approval. The GBAS manufacturer should define integrity threat, analyze the integrity monitors and evaluate performance of the implemented monitors to verify integrity performance which is critical to the aircraft safety. This paper describes a statistical test result to evaluate performance of the code carrier divegence monitors implemented in KARI Integrity Monitor System software. The paper introduces analysis and test procedure which is developed for the performance evaluation and describes the analysis, the test scenario generation and the test results. The results show that the implemented monitors can detect the expected minimum detectable errors with satisfying the probability of missed detection requirements.
Kim, Youngsun,Jang, Ho Seong,Kim, Hyunki,Kim, Sehoon,Jeon, Duk Young American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.37
<P>We synthesized uniform CuInS2/ZnS nanocubes by adjusting reaction parameters at the ZnS growth stage. Higher temperature and zinc concentration were shown to drive resultant crystals to have cubic morphology, which could be ascribed to the facet-dependent ligand dynamics on the crystal surface and concomitantly preferred directions of crystal growth. It was found that these nanocubes exhibit sensitive responses, as of photoluminescence quenching, toward hydrogen peroxide, compared to pyramid-shaped nanocrystals. The origin of quenching was further analyzed to be the oxidation of thiolate ligands that leaves the quenching center on the surface. It was noted that the quenched photoluminescence could be fully recovered by introducing additional ligand molecules into the system. Being adopted in the shape-controlled crystal growth, the ligand-to-crystal interaction was shown to still govern the interfacial reaction, the oxidation by hydrogen peroxide, of faceted crystals in our system. It turns out that the reactivity at the crystal surface depends on the exposed facets, especially induced by shape control, and the weak ligand-binding nature of the nanocube renders it vulnerable to the surface reaction.</P>
간호대학생의 간호전문직관과 자기효능감이 임상수행능력에 미치는 영향
김영선 ( Youngsun Kim ),김향하 ( Hyangha Kim ),김정이 ( Jungee Kim ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.2
본 연구는 간호대학생을 대상으로 간호전문직관과 자기효능감이 임상수행능력에 미치는 영향을 파악하기 위한 서술적 조사연구이다. 연구대상은 J도에 소재한 J대학 간호대학생 171명으로 편의표집 하였다. 수집된 자료는 SPSS/Win 23.0 프로그램을 이용하여 빈도와 백분율, 평균과 표준편차, 피어슨 상관계수, 다중회귀분석으로 분석하였다. 연구결과 간호대학생의 임상수행능력에 대한 영향요인은 자기효능감, 자아개념 순으로 나타났다. 설명력은 55.5%였다. 따라서 간호대학생의 임상수행능력을 높이기 위해 자기효능감과 자아개념을 고려한 임상실습 프로그램 계획과 적용이 필요하다. The purpose of this study was to examine the effects of nursing professionalism and self-efficacy on clinical competency in nursing students. Participants of were 171 students of nursing science department, C university in J province, from whom this research collected data through convenient sampling. And then, the data were statistically processed using the SPSS/WIN 23.0 program, especially through Pearson’s correlation coefficient analysis and the regression analysis. As a result, it was turned out that the influence factors in nursing students’ clinical competency were both self-efficacy and self-concept of the profession which are subject to the nursing professionalism. Also, it was found that those two factors accounted in total for 55.5% of that level. Therefore I think it is necessary to plan and apply a clinical practice program in consideration of self-efficacy and self-concept of the profession in order to enhance the clinical competency in nursing students.
Design and application of 2D illusory vibrotactile feedback for hand-held tablets
Kim, Youngsun,Lee, Jaedong,Kim, Gerard Jounghyun SPRINGER SCIENCE + BUSINESS MEDIA 2017 JOURNAL ON MULTIMODAL USER INTERFACES Vol.11 No.2
<P>In this study, we investigate whether the 'out of body' vibrotactile illusion known as funneling could be applied to enrich and thereby improve the interaction performance on a tablet-sized media device. First, a series of pilot tests was taken to determine the appropriate operational conditions and parameters (such as the tablet size, holding position, minimal required vibration amplitude, and the effect of matching visual feedback) for a two-dimensional (2D) illusory tactile rendering method. Two main experiments were then conducted to validate the basic applicability and effectiveness of the rendering method, and to further demonstrate how the illusory tactile feedback could be deployed in an interactive application and actually improve user performance. Our results showed that for a tablet-sized device (e.g., iPad mini and iPad), illusory perception was possible (localization performance of up to 85%) using a rectilinear grid with a resolution of 5 7 (grid size: 2.5 cm) with matching visual feedback. Furthermore, the illusory feedback was found to be a significant factor in improving the user performance in a 2D object search/attention task.</P>
Youngsun Kim 한국언어청각임상학회 2009 Communication Sciences and Disorders Vol.14 No.1
Background & Objectives: The purpose of this study was to examine the temporal and biomechanical differences of duration and width of the UES opening among people of different ages and genders during normal swallowing. Methods: Videotapes of videofluoroscopic swallowing examinations (VFSEs) of 69 normal subjects were analyzed. Results: Results yielded a significant effect for age between younger and older subjects for both duration of UES opening (DUESO) and maximum width of UES opening (MWUESO) (p < .01). No gender differences were observed. Discussion & Conclusion: These differences may be related to muscle weakness with aging. However, older subjects did not show aspiration. These normal data of UES opening will be used for comparisons with stroke patients who exhibit aspiration in future research.