• Title/Summary/Keyword: 실증적 분포

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Development of Seat Allocation Model with Individual Demand's Diversion and Upgrade (개인수요의 상.하 이동을 고려한 좌석할당모형 개발)

  • Lee, Hwi-Young
    • The Journal of the Korea Contents Association
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    • v.7 no.5
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    • pp.156-165
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    • 2007
  • The concepts of static seat allocation model has been used widely in the air transportation industry, and proven as a good concepts for managing perishable assets. The paper analyzed, in realistic environment, the volume of Accept Demand and Reject Demand through several times' simulation experiments at each fare level by using C-Program analyzing process applied to upward and downward models of demand, to analyze the change of fare level when upward and downward shifts of fare levels' demand happen at once. As a consequence, I concluded that the revenue of the case to consider the both shifts of demand at each fare level is bigger than that of the case to consider the single shift of demand at each fare level, except the case to downsize the seat allotment at very low price when supply is bigger than demand, with developing a general model concerned with plural fare levels.

Performance Comparison of Implementation Technologies for Image Quality Enhancement Operations on Android Platforms (Android 플랫폼에서 구현 기술에 따른 화질 개선 연산 성능 비교)

  • Lee, Ju-Ho;Lee, Goo-Yeon;Jeong, Choong-Kyo
    • Journal of Digital Contents Society
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    • v.14 no.1
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    • pp.7-14
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    • 2013
  • As mobiles devices with high-spec camera built in are used widely, the visual quality enhancement of the high-resolution images turns out to be one of the key capabilities of the mobile devices. Due to the limited computational resources of the mobile devices and the size of the high-resolution images, we should choose an image processing algorithm not too complex and use an efficient implementation technology. One of the simple and widely used image quality enhancement algorithms is contrast stretching. Java libraries running on a virtual machine, JNI (Java Native Interface) based native C/C++, and NEONTM SIMD (Single Instruction Multiple Data) are common implementation technologies in the case of Android smartphones. Using these three implementation technologies, we have implemented two image contrast stretching algorithms - linear and equalized, and compared the computation times. The native C/C++ and the NEONTM SIMD outperformed the native C/C++ implementation by 56-78 and 50-76 time faster respectively.

Simulation of Soil Moisture in Gyeongan-cheon Watershed Using WEP Model (WEP 모형을 이용한 경안천 토양수분 모의)

  • Noh, Seong-Jin;Kim, Hyeon-Jun;Kim, Cheol-Gyeom;Jang, Cheol-Hee
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.720-725
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    • 2006
  • 토양수분은 식물의 생장 및 가용수자원 산정 등에 있어서 중요한 요소로서 토양층 상부의 수 m내에 존재하는 수분의 양을 일컫는다. 토양수분과 토양수분의 공간적 시간적 특징들은 증발, 침투, 지하수 재충전, 토양침식, 식생 분포 등을 지배하는 중요한 요소이다. 강우 등으로 인한 지면과 지표하에서의 순간적인 포화공간의 형성 및 유출의 생성 등을 포함하는 과정과 증발산 등은 모두 비포화대(vadose zone) 혹은 토양층에서의 토양수분의 함량에 크게 의존하게 된다(이가영 등(2005)). 분포형 수문모형은 유역을 격자단위로 세분화하여 매개변수를 부여하고, 증발산, 침투, 지표면유출, 중간유출, 지하수유출, 하도 흐름 등 여러 가지 수문요소를 해석하는 종합적인 수문모형이다. 지표면에 내린 강우가 증발, 침투, 유출될 지는 토양수분의 함량에 크게 의존하게 되며, 따라서 토양수분에 대한 적절한 모의가 분포형 수문모형의 정확도를 좌우하는 핵심이라 할 수 있다. 본 연구에서는 분포형 수문모형인 WEP 모형을 경안천 유역(유역면적: $575km^2$, 유로연장: 49.3㎞)에 적용하여 토양수분의 시공간분포를 모의하였다. 지점별 토양수분 모의결과, 토양 매개변수의 최대, 최소값 내에서 적절히 모의됨을 확인하였으나, 관측값이 없어 실질적으로 타당한지 여부는 검증하지 못하였다. 토양수분비율, 연간 증발산량, 지표면 유출량 공간분포를 비교한 결과, 토양수분비율이 연간 증발산량 모의에 직접적인 영향을 주는 것을 확인할 수 있었다. 일부격자에서는 토양수분이 지나치게 높게 모의되었는데, 지하수위와 관련있는 것으로 보이며, 구축된 자료가 부족한 지하대수층에 대한 정보부족이 토양수분 계산에도 영향을 준 것으로 보인다. 본 연구는 WEP 모형의 토양수분 해석능력에 대한 시험적용에 그 의의가 있으며, 향후 토양 및 지표하 매개변수 정보가 충분히 갖추어지고, 토양수분 관측결과 있는 대상유역에 대한 적용이 요구된다.-Moment 방법에 의해 추정된 매개변수를 사용한 Power 분포를 적용하였으며 이들 분포의 적합도를 PPCC Test를 사용하여 평가해봄으로써 낙동강 유역에서의 저수시의 유출량 추정에 대한 Power 분포의 적용성을 판단해 보았다. 뿐만 아니라 이와 관련된 수문요소기술을 확보할 수 있을 것이다.역의 물순환 과정을 보다 명확히 규명하고자 노력하였다.으로 추정되었다.면으로의 월류량을 산정하고 유입된 지표유량에 대해서 배수시스템에서의 흐름해석을 수행하였다. 그리고, 침수해석을 위해서는 2차원 침수해석을 위한 DEM기반 침수해석모형을 개발하였고, 건물의 영향을 고려할 수 있도록 구성하였다. 본 연구결과 지표류 유출 해석의 물리적 특성을 잘 반영하며, 도시지역의 복잡한 배수시스템 해석모형과 지표범람 모형을 통합한 모형 개발로 인해 더욱 정교한 도시지역에서의 홍수 범람 해석을 실시할 수 있을 것으로 판단된다. 본 모형의 개발로 침수상황의 시간별 진행과정을 분석함으로써 도시홍수에 대한 침수위험 지점 파악 및 주민대피지도 구축 등에 활용될 수 있을 것으로 판단된다. 있을 것으로 판단되었다.4일간의 기상변화가 자발성 기흉 발생에 영향을 미친다고 추론할 수 있었다. 향후 본 연구에서 추론된 기상변화와 기흉 발생과의 인과관계를 확인하고 좀 더 구체화하기 위한 연구가 필요할 것이다.게 이루어질 수 있을 것으로 기대된다.는 초과수익률이 상승하지만, 이후로는 감소하므로, 반전거래전략을 활용하는 경우 주식투자기간은 24개월이하의 중단기가 적합함을 발견하였다. 이상의 행태적 측면과 투자성과측면의 실증결과를 통하여 한국주식시장에 있어서 시장수익률을 평균적으로 초과할 수 있는 거래전략은 존재하므로 이러한 전략을 개발 및 활용할 수 있으며, 특히, 한국주식시장에 적합한 거래전략은 반전거래전략이고, 이 전략의 유용성은 투자자가 설정한 투자기간보다 더욱 긴 분석기간의 주식가격정보에 의하여 최대한 발휘될 수 있음을 확인하였다.(M1), 무역적자의

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Study on the application methods of the power induction screening factor in urban and rural areas using the building density distribution (건물 밀집도 분포를 이용한 도시와 시골의 전력유도 차폐 계수 적용 방안 연구)

  • Choi, Mun-hwan;Lee, Snag-mu;Cho, Pyung-dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.05a
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    • pp.500-502
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    • 2013
  • The metallic underground pipes like as metropolitan water supply pipes and gas pipes have a screening effects for power induction phenomenon. Generally, urban area has more metallic underground facilities than rural areas because of its buildings or population density. So we can expect high screening effects for the power induction in urban areas, and we call it the city screening factor. We had carried out the measuring test in urban and rural area respectively 30 sites to prove the actual effects of city screening factor and we derived the numerical value of city screening effects. But we faced with a difficult question that how we can classify the real urban areas or rural areas correctly. In this paper, we introduce the classification method using density of building in test area to apply the city screening factor reasonably.

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Properties of alternative VaR for multivariate normal distributions (다변량 정규분포에서 대안적인 VaR의 특성)

  • Hong, Chong Sun;Lee, Gi Pum
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.6
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    • pp.1453-1463
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    • 2016
  • The most useful financial risk measure may be VaR (Value at Risk) which estimates the maximum loss amount statistically. The VaR tends to be estimated in many industries by using transformed univariate risk including variance-covariance matrix and a specific portfolio. Hong et al. (2016) are defined the Vector at Risk based on the multivariate quantile vector. When a specific portfolio is given, one point among Vector at Risk is founded as the best VaR which is called as an alternative VaR (AVaR). In this work, AVaRs have been investigated for multivariate normal distributions with many kinds of variance-covariance matrix and various portfolio weight vectors, and compared with VaRs. It has been found that the AVaR has smaller values than VaR. Some properties of AVaR are derived and discussed with these characteristics.

An Analysis of Degree of Visitor Concentration of Forested National Parks Using the Gini Coefficients and Lorenz Curve (지니계수와 로렌츠곡선을 이용한 산악형 국립공원의 탐방집중도 분석)

  • Han, Sang-Yoel
    • Journal of Korean Society of Forest Science
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    • v.95 no.4
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    • pp.476-483
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    • 2006
  • This study tried to estimate the concentration indices of 15 forested national parks using Gini coefficient and Lorenz curve which can be measure the degree of inequality. The concentration indices were estimated by two parts which are yearly index for the periods of 1997-2005 and travel origin area(city or province) distribution index each national park. The empirical results were as follows: first, yearly Gini coefficients showed severe inequality. Particularly, 2004 and 2005 Gini coefficients were .453 and .446. which are intensive inequality compared with other years. Second, in travel origin area distribution each national park, Gini coefficients of Bukhansan and Kyeryungsan national park were .916 and .855 which are the great inequality compared with other national parks. The other hand, Gini coefficients of Dukyusan and Byunsanbando national parks were .508 and .628 which are the lowest inequality. The national park policy manager should find out the factors of concentration and deconcentration each year and national park and decided the visitor distribution policy which visitor size and scope for balancing the natural resources use.

An Analysis on the Interrelationship between Land-use Characteristics and Damages caused by Natural Hazards (토지이용특성과 자연재해 피해액의 상관성 분석)

  • Shim, Jae-Heon;Kim, Ja-Eun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.9
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    • pp.4319-4325
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    • 2012
  • This study examines the effect of diverse land-use characteristics on the total sum of damages caused by natural hazards. The empirical results show that impermeable layer area, industrial land area, bare land area, stream area, and so on have a positive influence on damages, and that the area of levee has a strongly negative relationship with them. Therefore, this study strives to propose some efficient natural hazard mitigation ways in terms of land-use planning, based on our empirical findings.

The Impact Structure on Co-Creation, Shared Value and Customer Satisfaction of Customer Acceptance for Servicescape: Focusing on Theme Park Service (서비스스케이프에 대한 고객수용이 공동창조 및 공유가치와 고객만족에 미치는 영향 구조: 테마파크서비스를 중심으로)

  • Ahn, Yeon S.
    • Journal of Service Research and Studies
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    • v.10 no.1
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    • pp.97-107
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    • 2020
  • The purpose of this study is to demonstrate the effect of customer acceptance of servicescape on customer satisfaction focusing in theme park service. In particular, the degree of usefulness and ease of use perceived for servicescape will ultimately have the impact on customer satisfaction through the process of service co-creation and shared values creation. In order to demonstrate this structural influence relationship, a survey of 247 undergraduate and graduate students taking service management course was conducted. The customer's acceptance of the servicescape affects the co-creation activities of the service. It creates value and contributes to the improvement of satisfaction. Looking at the results of this study in detail, it is necessary to take into consideration the usefulness of the theme park employees' clothes and symbols, etc. in servicescape, and the convenience of the facility itself is important. This servicescape reveals that customers should be comfortable with the use of real-time information on the site and that customer satisfaction can be improved by creating new shared value. This study has been limited to the theme park service which has a large-scale service field and the distribution status of many customers in real time, so it is limited to apply to the other services with detail reinterpreting.

Accessability Analysis by Using QGIS of Living Convenience Facilities for the Elderly in Small Town - Case of Cheongdo Gun in Gyeongsang Bukdo - (QGIS를 활용한 소도시 고령자 생활편의시설 접근성 분석 - 경상북도 청도군을 대상으로 -)

  • Son, Sungum;Kim, Hocheol
    • Journal of the Korean Regional Science Association
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    • v.36 no.2
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    • pp.37-49
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    • 2020
  • Currently, the average aging rate has reached 14.8% in our country, despite the residents are aging or over the average aging rate has reached 31.8% with a population of less than 100,000. Various convenience facilities are concentrated in the town center, causing inconvenience to use. The main purpose of this study is to analyze the accessability of living convenience facilities in this area. This study builds on the population aging of the research target area and distribution of living facilities for the elderly based on MDIS data of the regional survey of the National Agriculture, Forestry and Fishing Survey of the National Statistical Office, and QGIS was used to visualize the status of the elderly, distribution of convenience facilities for the elderly, hot spot maps, and distance analysis, and also technical statistical analysis was conducted. As a result of the analysis, it was confirmed that the distribution and distance of living convenience facilities for the elderly in the area where the elderly lived a lot was located in a location that caused severe inconvenience to the use of the elderly. This suggests the necessity of the change facilities type and spatial reorganization by raising the need for space policy changes on the spatial distribution of elderly convenience facilities, reflecting the serious aging of small towns such as the study area.

Improving the Grading Indices for Land Suitability Assessment (토지적성평가 지표의 개선방안 연구 - 평가체계II를 중심으로 -)

  • Kim, In-Hyun;Oh, Kyu-Shik;Yang, Hee-Bum
    • Spatial Information Research
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    • v.17 no.2
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    • pp.201-212
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    • 2009
  • As GIS analysis method began to be introduced in late 1980's, studies of land development applying the GIS also started to be proceeded in various fields. Since 2003, Land Suitability Assesment has been adopted in order to prevent national land from development thoughtless for the environment and to plan appropriate national land management in terms of green development. Land Suitability Assessment System II based on diverse GIS analysis method such as Contour Analysis, Overlay Analysis, Network Analysis was particularly adopted to draft plans of specifying and altering of exclusionary zoning as well as installing and maintaining of urban planning facilities. But there has been a lot of problem, like an inaccurate basic data and assessment indicators, unmatched threshold, and contradicted evaluation result between each evaluating systems. Even though it is suited to an evaluation criteria, grade distribution is applied to start at 20, and development-centered evaluation result is offered. Now, we observed how suitability values and grading were changed, ordering to change grade distribution system from $20{\sim}100$ to $0{\sim}100$. In result, it showed changes of grades in some parcels. And in case of suitability values, 87% of parcels decreased to minimum 1 point, maximum 70 points. It means that changing grade distribution system of assessment system II doesn't have only influence on suitability values and grading but it is also an empirical analysis because of considering both development and maintenance.

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