• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.315-315
• /
• 2019

증산과 증발의 합으로 나타내지는 증발산은 지구내에서의 수문 순환에 영향을 미치는 중요한 인자로써, 지표와 대기의 에너지 교환을 담당하고 있다. 정확한 관측을 위해서 오래전부터 증발산에 대해서 관측하기 위하여 직접관측 방법들인 증발산계를 이용한 관측방법, 에디 공분산 방법을 이용한 플럭스타워 관측 방법 등을 사용하였으며, 물리 및 경험적인 방법인 Penman (1948), Monteith (1965) 방법, PT (Priestley and Taylor, 1972) 방법 등을 이용함으로써 증발산과 관계를 가진 수문기상인자를 이용함으로써 증발산에 대해서 추정하여 왔다. 대부분 지상 관측에 의존하기 때문에 시공간적인 값의 표현이 어렵다는 문제를 가지고 있으며, 관측 장비의 관리 및 유지비용이 증대로 인하여 조밀한 관측망을 구축하기 어렵다. 이러한 단점을 개선하고자 인공위성 및 재분석 자료를 활용하여 여러 경험식을 통해서 증발산 자료가 제공되고 있다. 그러나 이러한 자료들의 문제점은 각기 다른 경험식 및 다른 입력자료를 제공하고 있을 뿐만 아니라, 자료별 지역별 정확성이 차이가 발생한다. 따라서, 최근 연구에서는 지점자료와 인공위성 자료 및 재분석 자료를 모두 사용함으로써 수문기상인자를 개선하고자 하는 연구가 진행되어왔으며, 정확성 또한 개선된 것을 확인 할 수 있다. 그러나, 이러한 방법들의 가장 큰 문제점은 관측 자료가 필수적으로 필요하다는 것에 있다. 대부분의 나라나 지역에서는 조밀한 구축망을 구축하기 어렵기 때문에 실질적으로 적용하기가 어렵다는데 있다. 따라서 본 연구에서는 이러한 문제를 해결하기 위하여 지점자료가 필요없는 융합방법을 triple collocation 방법을 이용함으로써 제안하고자 한다.

• Archives of design research
• /
• v.17 no.2
• /
• pp.289-300
• /
• 2004

Recently, web casting on the internet has been expanding in number and size. Web Casting is different from the conventional television broadcasting since it can transmit various types of information through multimedia and it also can include interaction between users and broadcasting server. User experience by interaction becomes more important. Therefore, it is needed to win over customers by supplying satisfied experience through creative and different services, especially when there are consider competitions among music casting sites. In order to know how to make customers satisfied, we have to try to inspect what real customers in the Web Sites are acting and thinking, namely 'customer experience'. The 'customer experience' means every experience what users are expecting, doing, thinking and feeling when they stay in the Web site and online. In this thesis, the evaluation Guideline for music casting websites is developed by understanding customer experience on the music casting websites. The process of understanding customer experience was implemented through user observation methods, such as web Diary, group interview, and questionnaire. As a result of the study, 67 evaluation Guidelines with weight rate in 6 categories which are searching music, listening music, music video, music broadcasting, music mailing and other contents are developed. It can be used to analyze strengths and weakness of music casting sites and to establish business strategy for the more satisfied customer experience.

• The Korean Journal of Applied Statistics
• /
• v.33 no.5
• /
• pp.527-540
• /
• 2020

While analyzing data, researching outliers, which are out of the main tendency, is as important as researching data that follow the general tendency. In this study we discuss the influence function for outlier discrimination. We derive sample influence functions of sample mean, sample variance, and sample standard deviation, which were not directly derived in previous research. The results enable us to mathematically examine the relationship between the empirical influence function and sample influence function. We can also consider a method to approximate the sample influence function by the empirical influence function. Also, the validity of the relationship between the approximated sample influence function and the empirical influence function is also verified by the simulation of random sampled data in normal distribution. As the result of a simulation, both the relationship between the two influence functions, sample and empirical, and the method of approximating the sample influence function through the emperical influence function were verified. This research has significance in proposing a method that reduces errors in the approximation of the empirical influence function and in proposing an effective and practical method that proceeds from previous research that approximates the sample influence function directly through empirical influence function by constant revision.

• Journal of the KSME
• /
• v.33 no.7
• /
• pp.648-660
• /
• 1993

본 연구에서는 현재 시행착오적으로 이루어지고 있는 제품구조설계 및 포장설계 방법을 보다 합리적이고 효율적으로 개선해 보고자 하였다. 현재 설계 방법에서는 제품과 포장재 설계가 동 시에 진행되며 EVT 단계에서 낙하시험을 하여 문제점 발생시 보완, 수정하는 방법에 의하고 있다. 따라서 설계수정 기간이 길어지면 금형수정에 소요되는 비용도 상당히 많을 뿐 아니라, 경험적으로 포장재 설계를 하므로 최적의 포장을 하기는 더욱 어려운 상황이다. 이러한 문제점을 해결하기 위해서 본 해석에서는 TV에 대하여 충격시험에 대체하는 시뮬레이션 방법을 정형화 하였고, 한계 충격치 산출 및 포장재 자동설계 방법을 개발하였다.

• The Korean Journal of Applied Statistics
• /
• v.18 no.1
• /
• pp.67-81
• /
• 2005

Most of the previously proposed methods for the frailty model do not work well when there are many tied observations. This is partly because the empirical likelihood used is not suitable for tied observations. In this paper, we propose a new method for the frailty model with many ties. The proposed method obtains the posterior distribution of the parameters using the binomial form empirical likelihood and Bayesian bootstrap. The proposed method yields stable results and is computationally fast. To compare the proposed method with the maximum marginal likelihood approach, we do simulations.

• Journal of Internet of Things and Convergence
• /
• v.6 no.3
• /
• pp.53-58
• /
• 2020

The purpose of this study was to explore the experience of relational aggression that old users of institutions for seniors have, understanding what that experience means. In detail, the study tried to determine the nature of the experience through a structural description of what and how the elderly users experience relational aggression. For the purpose, this study made profound interviews with 7 elderly persons who sustained such aggression while using the seniors' institution in Busan. In the interview, a non-structured questionnaire survey was conducted. Data were analyzed using Colaizzi's phenomenological approach. As a result, the study identified 32 meanings of relational the experience which were in turn divided into 16 subjects, and 5 categories like 'I who am powerless', 'I who am in an unmanned island', 'whirlwinds in my mind', 'I who send myself into the world' and 'I who am dwindling'. Based on this result, this research made practical suggestions for preventing relational aggression as mentioned above.

• Journal of the Korean Geotechnical Society
• /
• v.29 no.3
• /
• pp.5-13
• /
• 2013

The compression index, representing the compressibility of clay, is generally obtained from the consolidation test, or predicted by empirical correlations using soil properties. However, empirical methods have regional limitations, because the compression index is affected not only by soil properties but also by site characteristics, such as deposition conditions and stress history. In this study, a method evaluating the compression index from typical soil properties is suggested using the characteristics of reconstituted clay. By analyzing the consolidation test results of Busan clay, the suggested method is verified, and the analysis of prediction error is carried out. It is shown that the proposed method evaluates the compression index more accurately than empirical methods previously suggested. The prediction errors occur by assumption, and are inversely proportional to $e_{cross}/e_0$, obviously.

• Journal of the Korean association of regional geographers
• /
• v.11 no.1
• /
• pp.1-18
• /
• 2005

Since the emerging period in !be Greek era, geography bas been defined as an empirical science in which travel and field trip bas been regarded as its major method for acquiring geographical knowledge or discovering geographical facts on the earth surface. In the contemporary geography, however, this kind of empiricism has been reduced to logical positivism which pursues rigid geographical laws, while diverse implications for empiricism (especially, that implied in the mythic imagination) have been ignored. On the other hand, recently a lot of books on trip for exploring regional cultural environments from the local to the global level have been poured out from outside of geography, and place-marketing has gained some attraction as a new method or strategy for regional development This paper is to consider diverse methodological implications of experience through geographical exploration especially hath from the standpoint of empirical geography and of humanistic geography, and the look on methodologically importance and limitations of place-marketing for regional development In conclusions, it is emphasized that those methodologies should be put together for a genuine exploration of regional cultural environment, and that place-marketing should be understood as a movement for rediscovering regional identity.

• The Journal of the Korea Contents Association
• /
• v.14 no.2
• /
• pp.364-375
• /
• 2014

The aim of this study was to exploring the experiences of life amomg alcoholics who suicide attempts. The main question of this study is "what the meaning and essence of experiences of life amomg alcoholics with suicide attempts?" The qualitative research method was taken for widely understanding and lively writing experiences of life amomg alcoholics who suicide attempts in the connection of eheir lives. As results, 12 categories appeared from 5 themes as data analysis. The major themes could be analyzed as "Continuing a dark confines of the psychology, emotion", "encounter with worthless oneself of the loath to admit", "The trigger inciting to suicide", "The roots of the drinking and suicide -living with fate", "Holding up a string of life". Based on these results, the practical implications for the alcoholics with suicide attempts had been discussed.

• Journal of the Korea Convergence Society
• /
• v.6 no.5
• /
• pp.63-75
• /
• 2015

The aim of this study was to know the experience of emergency nurses on hospital violence and violence's effect on nurses via convergent approach of phenomenological methodology to be known for a good method to study alive human's experience. This study is a qualitative study converged the phenomenological methods and 5 emergency nurses participated in an in-depth interview. From the transcript, 41 significant statements, 17 clusters of theme, 6 categories were extracted. The extracted categories are violence's background, emotional response, physical response, social response, passive coping and active coping. The hospital violence's negative effect on emergency nurses occurred in various sides and the countermeasure is required to prevent violence from hospital setting anymore.