• Communications for Statistical Applications and Methods
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• 제8권1호
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• pp.209-217
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• 2001

We obtain the approximate maximum likelihood estimators (AMLEs) for the scale and location parameters $\theta$ and $\mu$ in the three-parameter Weibull distribution based on Type-II censored samples. We also compare the AMLEs with the modified maximum likelihood estimators (MMLEs) in the sense of the mean squared error (MSE) based on complete sample.

• Journal of the Korean Data and Information Science Society
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• 제18권3호
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• pp.817-826
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• 2007

In this paper, we derive the approximate maximum likelihood estimators of the scale parameter and the location parameter in a generalized extreme value distribution under multiply Type-II censoring by the approximate maximum likelihood estimation method. We compare the proposed estimators in the sense of the mean squared error for various censored samples.

• 한국데이터정보과학회:학술대회논문집
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• 한국데이터정보과학회 2006년도 추계 학술발표회 논문집
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• pp.183-195
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• 2006

In this paper, we derive several approximate maximum likelihood estimators of the scale and location parameters in the Rayleigh distribution based on multiply Type-II censored samples. We compare the proposed estimators in the sense of the mean squared error for various censored samples.

• Journal of the Korean Data and Information Science Society
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• 제18권3호
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• pp.793-801
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• 2007

For multiply Type-II censored samples from a half-triangle distribution, the maximum likelihood method does not admit explicit solutions. In this case, we propose some explicit estimators of the location parameter in the half-triangle distribution by the approximate maximum likelihood methods. We compare the proposed estimators in the sense of the mean squared error for various censored samples.

• Communications for Statistical Applications and Methods
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• 제15권3호
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• pp.367-378
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• 2008

In this paper, we derive the approximate maximum likelihood estimators of the scale parameter and the location parameter in a double Rayleigh distribution based on multiply Type-II censored samples. We compare the proposed estimators in the sense of the mean squared error for various censored samples.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2464-2467
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• 2005

The purpose of this study was to explore the effectives of a virtual bicycle system in improving the ability of equilibrium sense of normal healthy adults. Experiments were performed to find the factors related to the training of equilibrium sense. The subjects consisted of young and elderly people and the group of young people was compared against the group of elderly people. We investigated three different running modes of virtual bicycle system with two successive sets in total. W measured the parameters related to the running time, the velocity, the weight movement, the degree of the deviation from the road, and the location of the center of pressure (COP). The results showed that the running capability of the elderly became much better after repeated training. In addition, it was found out that the ability to control postural balance and the capability of equilibrium sensory were improved with the presentation of the visual feedback information of the distribution of weight. We also found that the running time and the running velocity reduced when there was no visual feedback information. From the results, our newly developed bicycle system seems to be effective in the diagnosis of equilibrium sense as well as in the improvement of the sense of sight, and vestibular function of the elderly in the field of rehabilitation training.

• 보건의료산업학회지
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• 제7권4호
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• pp.23-32
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• 2013

This study aimed to explore possible relationships between self-efficiency and intention to leave in dental hygienists so as to provide basic data for developing solutions to effectively manage dental hygienist man power. A total of 206 dental hygienists from different dental care institutions in Cheonbuk Province were chosen as subjects by a convenience sampling method. Data were collected through a self-reported survey. The results were as follows. The self-efficiency was higher among dental hygienists who were more than 36 years of age, had graduated university, were at their cuurent job longer than 11 years, and reported their annual income to be more than 25 million won. As their age was younger and their education and income levels were lower, their intention to leave was stronger. Also subjects who were unmarried, did not feel satisfaction with their current job, and did not want to stay any longer at the location where they were currently working tended to have higher intention to leave. The higher their self-efficiency, the lower their turnover intention. An examination of the three factors offered by a factor analysis on self-efficiency, 1) sense of competence, 2) sense of confidence, and 3) strong drive, revealed that the higher their sense of competence, the lower their turnover intention. It was also revealed that their self-efficiency had a significant influence on their turnover intention and the most influential factor was their sense of competence.

• 대한수학교육학회지:학교수학
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• 제19권4호
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• pp.663-690
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• 2017

본 연구는 초등학교 수학에서 공간 감각 중 공간 방향 요인과 요소를 살펴보고, 이를 바탕으로 우리나라, 싱가포르, 일본, 중국, 홍콩, 핀란드, 독일, 미국의 교육과정과 교과서에서 다루고 있는 공간 방향과 관련된 내용을 비교 분석함으로써 앞으로 우리나라 초등학교 수학에서 공간 방향 지도를 위한 시사점을 제공하는 데 목적이 있다. 이를 위해 이론적 고찰을 통해 공간 방향 요인과 요소를 알아보고, 이를 기초로 지도 학년과 학년별 내용, 위치, 방향, 좌표, 경로, 거리의 공간 방향 요소와 요소별 내용과 현실 맥락을 중심으로 국가별 교육과정과 교과서를 분석하였다. 이론적 고찰과 교과서 비교 분석 결과 공간 방향 지도를 위한 시사점으로 교육과정에 공간 방향 내용과 기간 확장 및 고학년의 공간 방향 지도 강화, 공간 방향 내용 요소에 대한 기본적인 경험 제공, 학생들 주변의 친숙하고 현실적인 맥락 활용을 제안하였다.

• 한국정보통신학회논문지
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• 제18권6호
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• pp.1481-1487
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• 2014

본 논문에서는 스마트폰의 대중화로 인하여, 증강현실 기술 적용에 적합한 스마트폰용 위치기반 어플리케이션으로 골프정보시스템을 개발하였다. 골프는 목적지나 장애물까지의 정확한 거리와 모양 등을 정확히 알아야 하는 스포츠로서 증강현실기술 적용에 적합한 스포츠이다. 골프 스포츠의 대중화로 골프 인구는 지속적으로 증가하고 있으나 현재 출시된 골프관련 스마트폰용 앱들은 2D 이미지와 GPS기반으로만 구축되어 현장감 사실감이 많이 부족한 상황이다. 이에 골프장의 실제 환경에 따른 다양한 정보를 제공해 줄 수 있는 증강현실 기반 시스템으로 증강현실용 오픈소스인 Mixare를 골프스포츠에 유용하게 수정 보완하여 골프정보시스템을 개발하고 실제 골프장에의 적용에 대하여 기술하였다.

• Biomaterials and Biomechanics in Bioengineering
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• 제2권4호
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• pp.249-269
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• 2015

A problem faced by oil companies is the maintenance of the location register of pipelines that cross the surf zone, the regular survey of their location, and also their inspection. A survey of the state of art did not allow identifying operating systems capable of executing such tasks. Commercial technologies available on the market also do not address this problem and/or do not satisfy the presented requirements. A possible solution is to use robotic systems which have the ability to walk on the shore and in the surf zone, subject to existing currents and ripples, and being able to withstand these ambient conditions. In this sense, the authors propose the development of a spider crab biologically inspired robot to achieve those tasks. Based on these ideas, this work presents a biomechanical study of the spider crab, its modeling and simulation using the SimMechanics toolbox of Matlab/Simulink, which is the first phase of this more vast project. Results show a robot model that is moving in an "animal like" manner, the locomotion, the algorithm presented in this paper allows the crab to walk sideways, in the desired direction.