• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제17권2호
• /
• pp.542-558
• /
• 2023

A digital focus index (DFI) is a value used to determine image focus in scientific apparatus and smart devices. Automatic focus (AF) is an iterative and time-consuming procedure; however, its processing time can be reduced using a general processing unit (GPU) and a multi-core processor (MCP). In this study, parallel architectures of a minimax search algorithm (MSA) are applied to two DFIs: range algorithm (RA) and image contrast (CT). The DFIs are based on a histogram; however, the parallel computation of the histogram is conventionally inefficient because of the bank conflict in shared memory. The parallel architectures of RA and CT are constructed using parallel reduction for MSA, which is performed through parallel relative rating of the image pixel pairs and halved the rating in every step. The array size is then decreased to one, and the minimax is determined at the final reduction. Kernels for the architectures are constructed using open source software to make it relatively platform independent. The kernels are tested in a hexa-core PC and an embedded device using Lenna images of various sizes based on the resolutions of industrial cameras. The performance of the kernels for the DFIs was investigated in terms of processing speed and computational acceleration; the maximum acceleration was 32.6× in the best case and the MCP exhibited a higher performance.

• 대한한방내과학회지
• /
• 제36권3호
• /
• pp.228-235
• /
• 2015

Objectives: The aim of this study was to find an effective medical device to detect cold sensation of hands. Methods: Patients with cold sensation of hands (N=42) were recruited in July 2013. We surveyed patients’ general characteristics, severity of cold sensation, body temperature in Nogung (PC8) and Hyeopbaek (LU4) measured with a digital thermometer, digital infrared thermal imaging, and pulse wave velocity. Results: The relation between severity of cold sensation and temperature in Nogung (PC8) and Hyeopbaek (LU4) was statistically significant. The results showed a higher correlation of severity of cold sensation with Nogung (PC9) than with Hyeopback (LU4) temperature. No other indices were statistical significant. Conclusions: Measuring the Nogung (PC9) temperature is most reasonable for assessing the severity of cold sensation of hands. To generalize this result, however, a large-scale study is warranted.

• 디지털융복합연구
• /
• 제6권2호
• /
• pp.41-53
• /
• 2008

This research is to redefine the concept of Good School and to validate an effective Good Secondary School Scale in Kyung-gi Province and Seoul. As statistical methods, SPSS 13.0 and AMOS 5.0 were used. Item Analysis and Exploratory Factor Analysis(EFA) were conducted to test the reliability of items and the factor structure. And Confirmatory Factor Analysis(CFA) was conducted to test the validity and fitness of the Good School Scale. The outcomes are as follows: First, six factors(school environment, curriculum, teacher, school-based management system, director) will increase the good schooling effectiveness. Second, As a result of Confirmatory Factor Analysis(CFA), the goodness of fit indices(GFI AGFI, CFI, RMSEA) demonstrate statistically significance and fitness of the model. The final Good School Scale supports 6 Good School Factors obtained in main test. Therefore, we can say that this scale can be used as a valid instrument to measure a real Good Schooling Effectiveness at the secondary school situation in Korea.

• International Journal of Contents
• /
• 제6권1호
• /
• pp.26-34
• /
• 2010

This paper is on the premise that we need objective and measurable researches on quality evaluation of serious game for users' correct selection of games fitting for their purposes, for development of competitive high-quality game, and for stable growth of game industry. At first, we looked into various characteristics of serious game, read the present situation of game market, and proposed the necessity of quality evaluating model for serious game. To guarantee the objectivity of the proposed models, we compared and analyzed various proposals of standard model on the basis of international standard quality-evaluating model, ISO/IEC 9126 S/W. And so we extracted quality-evaluating items for serious game that composed of 8 evaluating areas and 25 sub-attributes, and presented quality-evaluating indices of each area. The proposed quality-evaluating model was added 2 areas and 8 sub-attributes to the international standard model, and the validity of the extracted items' was verified by expert group's questionnaire. Accordingly, we expect that this paper will increase game users' satisfaction, promote the development of high-quality games, and contribute to continuous growth in serious game market.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2004년도 학술발표회
• /
• pp.209-214
• /
• 2004

국내산지사면에서의 토양수분의 시공간적 분포를 파악하기 위하여 TDR(Time Domain Reflectometry)을 이용한 토양수분 장기 모니터링을 실시하였다. 대상사면을 측량하여 DEM(Digital Elevation Model)을 구축하고 흐름분배알고리즘에 적용하여 측정지점을 선정, 역 측량하여 효율적인 측정 체계를 구축하였다. DEM을 통하여 대상산지사면의 지형을 파악, 활용하여 정적 습윤지수(steady-state wetness index), 반동력학적 습윤지수(quasi-dynamic wetness index)를 구하였다. 장기 모니터링을 통한 토양수분 자료를 시공간적으로 분석하고 각각의 습윤 지수의 특징을 분석하고 습윤 지수와 토양수분 실측치와의 유의성과 제한점을 비교 분석하였다.

• 한국수자원학회논문집
• /
• 제34권4호
• /
• pp.391-401
• /
• 2001

토양수분의 공간적 분포를 예측하기 위하여 지표면 곡률관련인자, 지형흐름인자, 태양에너지 복사인자들을 계산하였다. GPS와 토양수분측정기를 활용한 산지유역에서의 토양수분측정은 토양수분의 공간적 분포자료의 구축을 가능하게 했다. 측정된 토양수분자료와 토양수분 추정인자 사이의 상관관계를 분석하였다. 다중회귀분석을 통한 토양수분 추정인자와 토양수분의 공간적 분포상황에 대한 검토는 수치고도모형(DEM)의 분석을 통한 토양수분 추정능력의 가능성과 한계성을 보여주었다.

• 천문학회보
• /
• 제36권2호
• /
• pp.81.2-81.2
• /
• 2011

Motivated by recent attempts to derive geomagnetic activity from hourly mean data in long term studies, we test the recursive Kalman filter method to obtain the regular solar variation curve of the geomagnetic field. Using a simple algorithm, we are able to assign a quiet day curve to every day separately, without the need for additional input parameter(s) to define the geomagnetically quiet days. We derive a digital counterpart AhK of the analog range index Ak at the subauroral Sodankyl$\ddot{a}$ station and compare it to the earlier digital estimate Ah and the local Ak index. We find that the new method outperforms the former estimate in every aspect studied and provides a robust, straightforward manner of estimating and verifying the manually scaled Ak index, based on readily available hourly values. The model is independent of sampling; thus, for shorter term studies where high-sampling data are available, more accurate estimates can also be obtained when needed. Therefore, in contrast to other recent approaches, we do not provide a method to quantify irregular activity directly but derive the actual quiet day curves in the traditional manner. In future applications the same algorithm may be used to define a wide variety of geomagnetic indices (such as Ak, Dst, or AE).

• 디지털융복합연구
• /
• 제9권6호
• /
• pp.165-172
• /
• 2011

본 논문에서는 3차원 평가환류체계를 기반한 성과측정모델을 제안하며, 제안하는 평가모델을 이용하여 2008년과 2009년에 수행한 7개의 공공 u-IT 서비스의 사용자 만족도와 활용도를 분석한다. 본 연구를 통해, 당초 공공 u-IT 서비스 지원사업이 목표하였던 대부분의 연구목적을 달성하였음을 알 수 있었으며, 성과측정 및 분석결과는 향후 추진할 신규과제의 추진방향 제시한다.

• 정보처리학회논문지C
• /
• 제18C권4호
• /
• pp.255-264
• /
• 2011

TV-Anytime은 XML을 PVR이나 방송서비스에 적용하기 위하여 서비스, 컨텐츠 정보 표현을 위한 스키마와 전송 프로토콜을 정의하여 많은 방송 규격에서 참조 문서로 활용되고 있다. 높은 확장성과 가독성에 비해 텍스트기반으로 정보를 기술하여 문서가 커지는 단점이 존재하며 이를 극복하기 위한 인코딩 알고리즘이 많이 제안되고 있다. 본 논문에서는 TVA 디스크립션을 전송하는 과정에서 문서의 크기를 최소화 할 수 있는 최적화 정보를 서버 단에서 반영하는 효율적인 인코딩 방식과 캡슐화 과정에서 색인 정보에 필요한 정보를 줄이고 정보를 빠르고 직관적으로 수신할 수 있는 인덱싱 방식을 제안한다.

• Current Optics and Photonics
• /
• 제6권2호
• /
• pp.161-170
• /
• 2022

Three-dimensional (3D) geometric models are introduced to correct vignetting, and a downhill simplex search is applied to determine the coefficients of a 3D model used in digital microscopy. Vignetting is nonuniform illuminance with a geometric regularity on a two-dimensional (2D) image plane, which allows the illuminance distribution to be estimated using 3D models. The 3D models are defined using generalized polynomials and arbitrary coefficients. Because the 3D models are nonlinear, their coefficients are determined using a simplex search. The cost function of the simplex search is defined to minimize the error between the 3D model and the reference image of a standard white board. The conventional and proposed methods for correcting the vignetting are used in experiments on four inspection systems based on machine vision and microscopy. The methods are investigated using various performance indices, including the coefficient of determination, the mean absolute error, and the uniformity after correction. The proposed method is intuitive and shows performance similar to the conventional approach, using a smaller number of coefficients.