• 물과 미래
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• 제7권2호
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• pp.107-111
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• 1974

Annual runoff in the Nakdong river basin has been analyzed to find the probability functions of best fit to distribution of historical annual runoff. The results obtained are as follows; (1) Log-normal 3-parameter disrtibution is believed as the probability function of best fit to historical distribution (2) Log-normal 3-parameter disrtibution is believed as the best fit probability function among Log-normal dist-ributions. (3) In the test of goodness of fit, $x^2-test$ shows that probability of $x^2-valus$ in Log-normal 3-parameter distribution is nearly more than 90%. But in the Simirnov-Kolmogorov test, hypotheses for the probability distributions cannot be rejected at significance level 5% & 1%. (4) Among 7 gauging stations, Dongchon & Koryung-Bridge's records show lower fitness to the theoretical probability functions than other 5 gauging station's

• Journal of applied mathematics & informatics
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• 제28권1_2호
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• pp.439-450
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• 2010

In this paper, we propose a new idea to evaluate the prediction accuracy of user's preference generated by memory-based collaborative filtering algorithm before prediction process in the recommender system. Our analysis results show the possibility of a pre-evaluation before the prediction process of users' preference of item's transaction on the web. Classification functions proposed in this study generate a user's rating pattern under certain conditions. In this research, we test whether classification functions select users who have lower prediction or higher prediction performance under collaborative filtering recommendation approach. The statistical test results will be based on the differences of the prediction accuracy of each user group which are classified by classification functions using the generative probability of specific rating. The characteristics of rating patterns of classified users will also be presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1420-1422
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• 2000

The railway signaling system consists of micro-computerized vital devices on board and ground, which are connected to one another by track circuits, and interlocking equipment for route control. Therefore it is important to validate the required functions of developed system and interface between developed signaling systems. To verify the conditions and functions of signaling functions, the laboratory prototype test bench, which consists of personal computers LAN, will be developed. In this paper design of signaling system test-bench for high-speed signaling is described and developed software module are presented.

• 센서학회지
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• 제32권3호
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• pp.180-186
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• 2023

Test devices can perform various functions, such as research on detection targets, sensors that detect detection targets, combined products containing sensors, and certification for the launch of combined products. However, the scope of use of test devices is limited because they perform only a single role or could only serve a particular purpose in the past. Therefore, studies on test devices that can perform various functions, such as research on detection targets, sensors that detect detection targets, combined products containing sensors, and certification for the release of combined products are necessary. Accordingly, this study proposes a test device that can increase the scope of use in the technical field of electric fires. In addition, we examine various outcomes of the proposed test device.

• 한국산학기술학회논문지
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• 제16권10호
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• pp.7189-7195
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• 2015

모멘트법(MoM)인 TE(transversw electric) 전장 적분 방정식(EFIE)으로 완전 전기도체(PEC) 원통을 산란 해석하였다. 이 과정에서 나타나는 특이점(singlarity)과 과대 특이점(hypersingularity)을 포함한 적분 계산은 어렵기 때문에 수치해석 방법으로 특이점을 고립시켜 자체항(self-term)을 얻었다. 모멘트법에서 base 함수와 test 함수의 선택은 수치해석 결과의 정확도와 수렴에 있어 매우 중요한 요인이됨은 알려져 있는 사실이다. basis 함수와 test함수를 달리하여 세 가지 방법으로 PEC 원통에 유도된 전류를 구하였다. 이렇게 구한 결과를 해석학적 방법과 모멘트법에서 얻은 전류와 비교하여 상대 효율 전류 오차를 구하였으며 어떤 결합 방법이 효율적인지 확인하였다. 또한 각 결합방법에 따른 상대 효율 전류 오차의 수렴율을 구하여 가장 정확한 결과를 얻을 조건을 찾았다. 전류 오차의 가장 빠른 수렴오더(order of convergence) 2.528은 펄스 base 함수/델타 test 함수 결함 조건에서 얻었다.

• 정보보호학회논문지
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• 제29권6호
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• pp.1425-1435
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• 2019

디지털 제어기 적용의 확대로 원자력 시설에 대한 사이버보안 이슈가 대두되었다. 이에 대처하기 위해 공표된 국내 원자력 시설에 대한 사이버보안 기술기준 RS-015에서는 원자력 시스템 개발자에게 보안 기능의 적용과 아울러 알려진 취약점 분석, 보안 기능에 대한 시험 및 평가를 요구하고 있다. 이를 위해서는 원자력 사이버보안 기술기준에 따른 보안 기능 적합성 시험 절차 및 방법 개발이 필요하다. 본 연구에서는 RS-015의 기술적, 운영적, 관리적 보안조치에 대한 세부항목을 분류하여 기기 수준에서 요구되는 보안 요건을 도출하고 기기에 구현되는 보안 기능이 보안 요건을 만족하는지를 시험하는 절차와 방법을 개발하였다. 본 논문에서는 보안 기능 적합성 시험 절차 및 방법 개발을 위한 과정을 설명하고 개발된 시험사례를 제시한다.

• 한국전문물리치료학회지
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• 제22권2호
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• pp.11-20
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• 2015

The purpose of this study was to evaluate the effect of dual-task training with cognitive effort on the walking and balance functions of chronic stroke patients. The study included 14 chronic stroke patients, who were randomly divided into the experimental group (EG) and control group (CG), each with 7 patients. The EG performed the dual-task training with cognitive effort 3 times a week, 30 minutes for 4 weeks, where as the CG performed single-task training three times a week, for 30 minutes for 4 weeks. Outcome assessments were made with 10 m walk test, timed up and go test, 6 minutes walk test, and Berg balance scale. In within-group comparison, subjects from the EG showed significant differences in all variables (p<.05), while subjects from the CG showed only significant differences in 6 minutes walk test, and Berg balance scale (p<.05). Further, there was significant difference in the improvement rate of 10 m walk test. The findings suggest that the dual-task with cognitive effort may be beneficial for improving walking and balance functions of patients with chronic stroke.

• 성인간호학회지
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• 제20권1호
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• pp.55-64
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• 2008

Purpose: The purpose of this study was to identify the effect of Meridian pressure on the functions of upper extremities and discomfort of ADLs of hemiplegic patients. Methods: The research design was a nonequivalent control group, non-synchronized design. Subjects were 35 hemiplegic patients who were hospitalized at L Oriental Medical Hospital; 18 for the experimental group and 17 for the control group. The experimental group was given meridian pressure for 10 minutes daily for 2 weeks. The data were analyzed by SPSS 12.0 program. The ${\chi}^2$-test and t-test were used for the two groups' homogeneity, and t-test was used for the hypothesis test. Results: Manual muscle test, ROMs of wrist extension, elbow flexion, and shoulder extension of the experimental group increased compared to the control group. Shoulder pain and index finger circumference of the experimental group decreased compared to the control group. The experimental group showed to have less discomfort of ADLs than the control group. Conclusion: The study results verified that meridian pressure is effective for improving the functions of hemiplegic patients' upper extremities as well as reducing discomfort of ADLs.

• 한국산업정보학회논문지
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• 제13권2호
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• pp.18-27
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• 2008

최근에 임베디드 시스템에 첨가되는 기능들은 대부분의 응용분야에서 점점 다양화되고 복잡해지고 있다. 임베디드 소프트웨어가 점점 더 많은 기능을 포함하게 되고, 그 크기도 점점 커지고 있다. 따라서 소프트웨어 개발자들이 제시간에 개발기간을 맞추는 것이 점점 더 어려워지고 있다. 그러므로 임베디드 소프트웨어 개발에 적합한 설계 및 시험 기법이 요구된다. 이 논문에서 우리는 임베디드 소프트웨어를 위한 소프트웨어 구조 형태를 제안한다. 이 구조는 재사용 가능한 기능의 조립을 촉진시키며 개발자가 개발기간을 단축하는데 도움이 된다. 또한 우리는 목적시스템에서 동작하는 임베디드 소프트웨어를 시험하는 기법과 도구를 제안한다.

• 대한간호학회지
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• 제34권1호
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• pp.123-131
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• 2004

Purpose: This study was aimed to identify the effects of a ten-week stretching exercise program on physiological, psychological functions, and activities of daily living(ADL) among elderly women. Methods: Using a quasi-experimental design, the experimental group received a ten-week stretching exercise program 3 times a week from March to May in 2002. They were divided into 22 persons in the experimental groups in 2 halls where the program was incorporated, and 22 persons in the control group in 2 halls, where the program wasnot incorporated. Data was analyzed with descriptive statistics, the chi-square test, Fisher's Exact test, and ANCOVA was considered significant as a 2-tailed test. Results: There was a significant improvement in diastolic blood pressure(P=0.023), total cholesterol (P=0.019), triglycerides (P=0.002), spine ROM(P=0.000), trunk and hip-joint ROM(P=0.000), percent of body fat(P=0.039) as physiological functions, depression(P=0.041) as a psychological function, and activities of daily living(P=0.001) in the experimental group compared to the control group. Conclusion: A stretching exercise program showed good effects on improving physiological functions, psychological functions and activities of daily living among the elderly women in a city. Therefore, we recommend this program be utilized as a health promoting program for the elderly in the community.