• Proceedings of the Korean Information Science Society Conference
• /
• 1999.10a
• /
• pp.305-307
• /
• 1999

정보화 사회로 발전하면서 크고, 다양하며, 복잡한 데이터들이 생겨나고 저장, 유지되어 데이터베이스도 대형화되면서, 대용량 데이터베이스의 성 문제는 매우 중요한 논점이 되었다. 본 논문에서는 관계형 데이터베이스 시스템의 새로운 성능향상 보조도구를 소개한다. 본 도구의 목적은 사용자나 시스템 관리자가 특정 데이터베이스 시스템에서 성능 영향을 주는 요소들을 효과적으로 파악하여 데이터베이스 시스템이 높은 수준의 성능을 유지할 수 있도록 도와준다. 설계 원리, 시험 데이터베이스, 그리고 튜닝 질의어들이 보여진다. 9개의 카테고리 안의 총 36개의 시험 질의어가 제안되었다.

• Journal of Korean Society of Forest Science
• /
• v.105 no.4
• /
• pp.472-485
• /
• 2016

The main purpose of this research was to develop a multi-level evaluation framework for the management effectiveness of the Forest Genetic Resources Reserve (FGRR) at both the system level and the site level. The initial system level Management Effectiveness Evaluation (MEE) framework for FGRR was developed based on the MEE Framework designed by IUCN WCPA and MEE framework for Korean National Parks that was designed jointly by IUCN, the Korean Ministry of Environment, and the Korea National Park Service. Several indicators were added or modified considering characteristics of the FGRR. The final system level MEE frameworks consisted of 6 categories with total of 39 criteria and 42 indicators based on expert survey results. The initial site-level MEE framework was developed based on the site level MEE framework for Korean National Parks that was designed jointly by IUCN, the Korean Ministry of Environment, and the Korea National Park Service. The final site level MEE framework consisted of 6 categories with total of 16 criteria and 40 indicators based on both an expert survey and an intensive workshop with the officers in charge of managing the FGRR from the Korea Forest Service and local governments.

• 한국벤처창업학회:학술대회논문집
• /
• 2024.04a
• /
• pp.17-20
• /
• 2024

우리는 대표적인 디지털 플랫폼인 온라인 음식 주문 배달 산업을 대상으로 디지털 경제의 긴꼬리 효과를 계량화한다. 특히, 코로나19 시기를 거치면서 음식배달플랫폼 입점으로 인한 긴꼬리 효과의 변화 양상을 고찰한다. 배달의민족에 입점한 음식점 15,000곳을 무작위로 선별하고 이들 매장의 2019년부터 2021년까지 전체 주문 정보를 취합(aggregation)하여 선형로그변환 후 기울기를 추정하여 디지털 경제의 긴꼬리 효과를 실증 분석하였다. 2019년부터 2021년까지 관찰기간 동안 음식 배달 플랫폼 활용 음식점 주비모수 분포의 긴꼬리 효과는 강건하게 관찰되었다. 이는 코로나19 이후 음식배달 플랫폼을 통한 음식점의 디지털 전환이 틈새시장 확장에 일정 부분 기여하였음을 의미한다. 또한, 긴꼬리 효과는 객단가가 높을수록 매출액 상위 집단일수록 더 커지는 반면, 비황금 시간대 매출비중이 높은 경우 긴꼬리 효과가 통계적으로 유의하게 증가하지 않았다. 이 결과는 피자, 족발 등 단가가 높고 비교적 배달서비스가 활발한 카테고리에서 음식 주문 및 배달 산업의 디지털 전환 효과가 증가한다는 업계 실무자들의 관찰과 부합한다. 타 업종에서도 상대적으로 경쟁이 치열한 시장 구분에서 디지털 경제의 긴꼬리 효과가 보다 강건하게 관찰될 것이라고 여겨진다. 음식점 간 경쟁강도가 상대적으로 약한 비황금시간대 매출비중이 긴꼬리 효과에 통계학적으로 유의한 영향을 주지 않는다는 실증결과 또한 동일한 함의가 있다.

• International Commerce and Information Review
• /
• v.19 no.2
• /
• pp.193-212
• /
• 2017

In order to evaluate the evaluation of bi-national products, this study was classified according to product category similarity. In addition, by comparing the types of stores, we tried to suggest alternatives that can be practically applied to companies producing composite origin products. For this purpose, this study is applied to the analysis of bi-national product by product categories, such as public luxury, public luxury, private luxury, and private necessity, based on the psychological bases of consumers. The types of stores are divided into department store/direct store, outlet/discount store to elaborate measurement. As a result of the verification, it was found that brand evaluation and store evaluation had interactive effects depending on product type and store type. Specifically, in the case of public luxury goods, outlets/discount stores in both brand evaluation and store evaluation showed positive evaluation than department store/direct store. In the case of private necessity, there was no significant difference in brand evaluation, but in store evaluation, department store/direct store was confirmed that they had a relatively positive evaluation than outlets/discount stores. As a result, it was verified that consumers' evaluations can be changed according to the type of sales store for each product.

• The Journal of the Korea Contents Association
• /
• v.6 no.3
• /
• pp.102-107
• /
• 2006

While Internet-based distance learning has proliferated, its educational effectiveness remains controversial. As such, investigation into the problems of Internet-based distance learning is important and fundamental for an assessment of its educational effectiveness. In this study, problems of Internet-based distance learning are grouped into four categories, environmental problems, student problems, course design problems and operational problems. Based on survey data from 606 distance learning participants, perceptional and relative seriousness of problems are analysed. The results indicate that perceptional seriousness of all the problems is not statistically important. However, the findings indicate that the relative seriousness of self willingness among student problems and cheating within operational problems is most remarkable. In contrast, the relative seriousness of traditionally recognized problems such as H/W availability and network speed among environmental problems is least remarkable. An analysis of demographic differences such as sex, employment and age in terms of seriousness of problem is also performed. The results reveal the existence of statistically significant differences according to sex, employment, and age difference with regard to seriousness of problems.

• Land and Housing Review
• /
• v.1 no.1
• /
• pp.113-124
• /
• 2010

This study is evaluating that new hi-tech transit systems each type of function and introduce applicable guideline decreases land sale price in New town and Large scale land development projects. For this, use the look-up table through the composite category of each type of system at the functional types, local characteristics. It also, As introduce the new systems calculate the Social benefits such as altered public traffic transfer system, reduced transit time and reduced carbon emission considering the three-dimensional arterial roads. As a result, New transportation systems contribute that the more reducing traffic congestion and air pollution and municipalities seeks for environment-friendly policy. However, this paper emphasize that the new transportation system has been introduce without considering the characteristics of locality and the efficient arrangement of them, it cannot be transferred the to the existing public traffic efficiently, futhermore causes the sale price in new large scale land development projects.

• The KIPS Transactions:PartB
• /
• v.13B no.2 s.105
• /
• pp.121-126
• /
• 2006

In this paper, we propose an approach to increase the power of clustering Web images by using high-level semantic features from text information relevant to Web images as well as low-level visual features of image itself. These high-level text features can be obtained from image URLs and file names, page titles, hyperlinks, and surrounding text. As a clustering engine, self-organizing map (SOM) proposed by Kohonen is used. In the SOM-based clustering using high-level text features and low-level visual features, the 200 images from 10 categories are divided in some suitable clusters effectively. For the evaluation of clustering powers, we propose simple but novel measures indicating the degrees of scattering images from the same category, and degrees of accumulation of the same category images. From the experiment results, we find that the high-level text features are more useful in SOM-based Web image clustering.

• Journal of Korean Society of Environmental Engineers
• /
• v.38 no.6
• /
• pp.299-308
• /
• 2016

Seoul metropolitan has established a vision as 'Healthy water-cycle city' to resolve urban water-environmental deterioration. And it established administrative structure to expand Low Impact Development (LID) facilities to recover aggravated water-cycle and water-environment. Therefore, various LID facilities are constructed and operated, however, benefit analytic plans for systematic valuation are insufficient. In this study, to analyze economic, environmental and social benefits of LID facilities, contents for benefit analysis were selected and categorized as water, energy, air quality and climate changes. As a result of quantification and valuation to the beneficial effects, LID facilities showed the total benefit as 1,191~3,292 won/yr. Characteristics of benefit distribution by analysis contents were various reflecting functional characteristics of each LID facility (Water: 30~90%, Energy: 4~44%, Air quality: <1~2%, Climate change: 5~22%). As a result of Triple Bottom Line analysis, economic benefit showed the greatest portion as 75~90%. As further studies, suggested benefit assessment plans for each LID facility should be applied to inter-connected LID systems on complex-scaled area, and synergy effects by various LID systems would be evaluated such as prevention of heat island and flood disasters.

• 한국HCI학회:학술대회논문집
• /
• 2006.02b
• /
• pp.699-704
• /
• 2006

본 연구는 이러닝에 있어서 디지털스토리텔링 기법을 적용함으로써 얻어지는 긍정적 학습효과를 학습동기 유발에 중점을 두고 연구한다. 또한, 연구결과를 통하여 이러닝 환경에서 디지털스토리텔링 기법이 활발히 차용될 수 있는 시작점을 제시하고자 한다. 다양한 학습에 있어서 스토리텔링의 긍정적인 역할은 이미 검증되어왔으며, 현재 이 분야의 연구자들은 학습효과를 높이는 스토리텔링의 공연적 차원을 포착한 비디오, 참여적인 역동적 형태의 기술을 통한 디지털스토리텔링을 발전시키기 위한 문턱에 와 있다. 이러닝과 스토리텔링 간의 큰 그림 안에서, 본 연구는 개별 과목의 지식을 전달하기에 적합한 실제의 디지털 스토리텔링 기법을 제시하고 이러한 기법을 통하여 얻어지는 학습효과를 설문을 통하여 검증한다. 설문을 통하여, 본 연구는 다음과 같은 주요 발견을 할 수 있었다: 학습자들은 이러닝 학습자료에 디지털 스토리텔링 기법이 쓰일 때 보다 많이 동기부여가 되었다. 이것은 ARCS 이론의 4 카테고리-주의력, 관련성, 자신감, 만족감-분야에서 SPSS 10.0을 이용하여 분석한 결과 빈도 및 T-Test에서 디지털 스토리텔링 기법이 쓰일 때 모두 고르게 긍정적인 결과를 보임으로써 결론에 도달하게 된 것이다. 본 연구의 남은 과제는 스토리텔링 기법의 실제 재현기법을 개발하고 이를 통한 학습효과의 증진을 계속 검증하는 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.12
• /
• pp.5023-5028
• /
• 2010

In this paper, an image based LED design simulator is proposed to reduce LED design cost mostly contingent on a design expert. Current techniques about LED design schemes have mostly treated text-based LED simulators. The proposed method is to provide novel and easy simulator for LED designers. At first, image filters including histogram equalization, bicubic interpolation. and scaling are employed. Color mapping and special effects are added as well. Experimental results classified into several categories along with running times are shown to validate the proposed methods.