• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.1789-1790
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• 2006

This paper reports a new test facility to investigate the characteristics of the thrusters mounted on the small scale underwater vehicle using Force/Torque sensor. With the test facility proposed here, No disassembly needs be made to the target vehicle, which makes us possible to get the realistic forces of the vehicle rather than the fortes of the thrusters themselves. Experimental data analyses, heave, sway, and surge, for the QI ROV are given as an example of this method.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 춘계종합학술대회
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• pp.263-267
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• 2000

기존의 트래픽 분석은 포아손 분포나 마르코프 모델로 트래픽을 모델링하고, 패킷의 큐 도착을 지수분포로 가정하였으나, 지난 몇 년간의 연간결과 네트워크 트래픽은 비주기성 및 버스트 특성을 가심을 알게 되었다 이러한 트래픽의 특성은 자기유사 특성을 가진 새로운 트래픽 모델로 분석 하므로써, 네트워크의 확장성, QoS, 그리고 최적화된 설계를 가능하게 한다. 본 논문에서는 시뮬레이션 망을 통한 small-scale 에서의 혼재된 트래픽 특성과 실제 WAN의 도착 지연시간, 그리고 전체망의 이용률에 대한 각각의 자기유사특성을 분석 한다.

• 대한전기학회논문지:전력기술부문A
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• 제51권11호
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• pp.577-584
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• 2002

This paper presents a novel approach based on eigenvalue perturbation of augmented matrix(AMEP) to estimate the eigenvalue for variation of controller parameter. AMEP is a useful tool in the analysis and design of large scale power systems containing many different types of exciters, governors and stabilizers. Also, it can be used to find possible sources of instability and to determine the most sensitivity parameters for low frequency oscillation modes. This paper describes the application results of AMEP algorithm with respect to all controller parameter of KEPCO systems. Simulation results for interarea and local mode show that the proposed AMEP algorithm can be used for turning controller parameter, and verifying system data and linear model.

• Communications for Statistical Applications and Methods
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• 제9권1호
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• pp.229-240
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• 2002

Whether to use linear or quadratic model in the analysis of regression data is one of the important problems in classical regression model and measurement error model (MEM). In MEM, four goodness of fit test statistics are available In solving that problem. Two are from the derivation of estimators of quadratic MEM, and one is from that of the general $k^{th}$-order polynomial MEM. The fourth one is derived as a variation of goodness of fit test statistic used in linear MEM. The purpose of this paper is to find the most powerful test statistic among them through the small-scale simulation.

• 농촌계획
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• 제7권2호
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• pp.13-25
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• 2001

Runoff and water quality was monitored from a watershed with small-scale livestock production farms. To evaluate pollution potential, land use, population, the size of livestock production of each farm, and livestock management method were surveyed. Climate and stream flow data were measured. Water samples were taken periodically for base flow conditions and some storm events. Pollutant loading was estimated by flow volume and concentrations of constituents. Delivery ratio of pollutant load was determined using estimated pollutant load.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2889-2891
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• 2000

We developed the training simulator for KEPCO operators to maintain small-scale distribution automation system effectively. The training simulator has the same screen form and operating environments in comparison with using system in field. It is to be wished that the operating techniques of KEPCO operators will progress to solve the fear of system operation and to training simulations of distribution conditions again and again.

• 동서간호학연구지
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• 제21권2호
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• pp.85-93
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• 2015

Purpose: This study was designed to assess the degree of Yangsaeng (oriental health care regimen) and happiness of nurses who work in small and medium-sized of hospitals and to identify correlations of between variables in Korea. Methods: Participants were 131 nurses in hospitals in Seoul and Gyeonggido. Data were analyzed using descriptive statistics, Pearson's correlation coefficients, t-test, ANOVA, Scheffe's test, multiple regression and Cronbach's ${\alpha}$. Results: Mean scores were 2.99 (5 point scale) for Yangsaeng and 4.64 (7 point scale) for happiness. Yangseang positively correlated with happiness (r=.463, p<.001). Job satisfaction was a significantly correlated with Yangsaeng and happiness. Yangsaeng, job satisfaction and age explained 28.0% of happiness. Conclusion: We found Yangsaeng could improve happiness. Therefore, Yangsaeng could be recommended as a way of promoting health and happiness.

• 한국항해학회지
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• 제15권3호
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• pp.73-97
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• 1991

The analysis and investigation are described for White's[2] equations compared to the equations of Runeburg[3] and Milano[5] for continuous icebreaking mode, Tunik[8-1] and Ghoneim[8-2] for ramming icebreaking mode. Calculation results compare reasonably well with published model-scale and full-scale icebreaker data by Baker[1] and Dick[11]. During continuous and ramming mode operation, using characteristics of an incebreaker, down ward force on ice and standard ice thickness broken are predicted. Additionally draft, trim and extraction difficulty are also predicted. The bow part line of an icebreakin $g^{ply}$ vessel is designed aiming to maximize the ice breaking capabiltiy as following conditions-low bow angle[20 degrees] at designed waterline, small spread angle complement [6 degrees] at designed waterline, small spread angle complement [6 degrees] and high propeller thrust [220tons]. with plow, two reamers and wave type bumper.

• 한국정보전자통신기술학회논문지
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• 제13권4호
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• pp.306-311
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• 2020

본 논문은 대량의 데이터를 활용한 모델 개발 시 다양한 라이브러리를 갖춘 파이썬 언의의 성능 향상방법을 다룬다. 파이썬 언어는 엑셀과 같은 스프레드시트 형태 데이터 처리 시 Pandas 라이브러리를 사용한다. 데이터 처리 시파이썬은 기가단위 이하 데이터 처리 시에는 인-메모리로 연산하여 성능 측면에서 크게 이슈가 없다. 하지만 기가단위 이상 데이터 처리 시 성능 이슈가 발생한다. 이에 본 논문은 데이터 처리 시 Pandas와 같이 사용할 수 있는 Dask 라이브러리를 활용하여 단일 클러스터 및 다중 클러스터에서 실행 작업을 분산처리 가능한 방법을 소개한다. 실험은 동일 사양의 하드웨어에서 간단한 지수산출 모델을 Pandas만 사용해서 처리하는 속도와 Dask를 같이 사용해서 처리하는 속도를 비교한다. 본 논문은 파이썬의 장점인 다양한 라이브러리를 쉽게 사용할 수 있다는 점을 유지하면서 성능측면에서도 대량의 데이터를 CPU 코어들이 분산 처리하여 모델을 개발할 수 있는 방법을 제시한다.

• 유통과학연구
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• 제17권3호
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• pp.107-116
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• 2019

Purpose - Why, why is it difficult to predict the appropriateness of self-employment, and what are the countermeasures and policy proposals to overcome. This study intends to further develop the field of statistical variables. It is necessary to overcome the limitation of existing proper scale research in Korea. We need to find statistical variables that can determine the appropriateness of self-employment in Korea. These efforts will be helpful in evaluating OECD countries and statistics and developing domestic economic indicators. Research design, data, and methodology - It is the discovery of statistical indicators and complementary indicators that have not been revealed in previous studies. Therefore, we sought to find new statistical parameters based on the statistics of the Korea National Statistical Office, the Bank of Korea, and overseas OECD statistics. (Proper Size of Adequacy) is defined as the specific gravity or number of the self-employed in Korea, which is shown as "Out Put" by statistical analysis of STATA panel statistical data. It is possible to further develop variables such as gross domestic product, gross national product, economic growth rate, unemployment rate, income tax rate, consumer price, tax level, exports, import amount, bill default I want to dig. Results - In addition to expanding economic indicators that can be explained by self-employment determinants, we have developed a variety of methods such as linear and non-linear (U-shaped, inverted U-shaped). It is the improvement of the self-employment determinants and the analysis method to estimate the appropriate scale. Conclusions - The proposed contents are reflected in self - employment appropriateness evaluation data and hope to help the government to select the policy support and to evaluate the government business after the policy support. These efforts are expected to be of great help to operators operating their own businesses, and to government and related institutional practitioners who support them. In this way, self-employment will be created in accordance with the Korean situation, where the happy life of all the people becomes the premise and the inclusive economic activities are guaranteed. It will improve the method of analyzing proper scale of small business owners and self-employed in Korea.