• Journal of KIISE
• /
• v.44 no.7
• /
• pp.703-709
• /
• 2017

Outsourcing databases is to offload storage and computationally intensive tasks to the third party server. Therefore, data owners can manage big data, and handle queries from clients, without building a costly infrastructure. However, because of the insecurity of network systems, the third-party server may be untrusted, thus the query results from the server may be tampered with. This problem has motivated significant research efforts on authenticating various queries such as range query, kNN query, function query, etc. Although aggregation queries play a key role in analyzing big data, authenticating aggregation queries has not been extensively studied, and the previous works are not efficient for data with high dimension or a large number of distinct values. In this paper, we propose the AMR-tree that is a data structure, applied to authenticate aggregation queries. We also propose an efficient proof construction method and a verification method with the AMR-tree. Furthermore, we validate the performance of the proposed algorithm by conducting various experiments through changing parameters such as the number of distinct values, the number of records, and the dimension of data.

• Journal of the Korean Society for information Management
• /
• v.22 no.3 s.57
• /
• pp.201-211
• /
• 2005

The archive management system for the National Assembly is divided into two ways and propelled by each of them : one is providing the service for the recording purpose by the legislation data processing office and the other is the archiving service by the National Assembly Archives. In this context, a clear analysis is much required for the organization and operation of the archive management system. Also, with the legislation research bureau scheduled to be organized newly, the data processing policy for the National Assembly is being largely modified as the operation plan for the joint computerization center of the National Assembly came out. In relation to the data processing of the National Assembly, the Assembly has requested the research outsourcing to the Korean Research Institute of Electronic Government and had the four possible operation plan of the computerization center as a result. On the basis of four alternatives proposed by the Korean Research Institute of Electronic Government, the Assembly has sought out the desirable way for the archive system of the Assembly. The status of the National Assembly Archives is taken into consideration in finding out the solution for improving the data management system of the National Assembly.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.14 no.10
• /
• pp.4136-4156
• /
• 2020

Recently, data can be safely shared or stored using the infrastructure of cloud computing in various fields. However, issues such as data security and privacy affect cloud environments. Thus, a variety of security technologies are required, one of them is security technology using CP-ABE. Research into the CP-ABE scheme is currently ongoing, but the existing CP-ABE schemes can pose security threats and are inefficient. In terms of security, the CP-ABE approach should be secure against user collusion attacks and masquerade attacks. In addition, in a dynamic cloud environment where users are frequently added or removed, they must eliminate user access when they leave, and so users will not be able to access the cloud after removal. A user who has left should not be able to access the cloud with the existing attributes, secret key that had been granted. In addition, the existing CP-ABE scheme increases the size of the ciphertext according to the number of attributes specified by the data owner. This leads to inefficient use of cloud storage space and increases the amount of operations carried out by the user, which becomes excessive when the number of attributes is large. In this paper, CP-ABE access control is proposed to block access of withdrawn users in dynamic cloud environments. This proposed scheme focuses on the revocation of the attributes of the withdrawn users and the output of a ciphertext of a constant-size, and improves the efficiency of the user decryption operation through outsourcing.

• Atmosphere
• /
• v.15 no.1
• /
• pp.27-34
• /
• 2005

High quality meteorological information is the typical product of service business industry which can offer the investment initiative by reducing the uncertainty and by activating other related industries. It requires a high level of meteorological technology and of ability to transform such technology as merchandising products. According to the analysis of the WMO data, the level of Korean meteorological technology is comparable to that of the nation with $17,500, GDP per head. However, the income of the meteorological business agent earns in Korea is 8 billion 4 hundred million won which is less than a tenth of that made by the US or Japan. The potential for such business field in Korea will be strong enough, if one can overcome such weak points. In addition, the efforts made by the government to advance the meteorological technology have been actualized gradually. Korean government will have a chance that is comparable to offering jobs for 20,000 unemployed by creating incomes of 40 billion won by meteorological technology as a sustained economic growth engine. It is proposed that government stimulate demand and supply by focusing on sales quantity than the price. The key points for creating the new demand are marketing and outsourcing of weather and climate information by maintaining the cooperative relationship between private and public sector.

• 한국IT서비스학회:학술대회논문집
• /
• 2008.11a
• /
• pp.145-148
• /
• 2008

IT 아웃소싱은 IT 서비스 관리에 있어서 가장 중요한 전략 중 하나로 인식되고 있다. 조직의 핵심 역량에 집중하면서 부차적인 IT 업무는 외부로부터 지원을 받는 IT 아웃소싱 전략은 조직의 효율과 성과를 높일 수 있는 효과적인 방안이면서, 보안에 대한 우려와 IT 서비스 공급자에 대한 의존도를 높이는 부작용을 동반하고 있다. 본 연구에서는 국내 민간 기업 데이터 센터의 IT 아웃소싱 전략과 운영을 분석하였다. 국내 주요 IT 서비스 전문 기업 3개사와 금융그룹 1개사의 데이터 센터에 대한 심층 인터뷰를 바탕으로, 데이터 센터들의 IT 아웃소싱 조직 현황, 아웃소싱 결정 요인, 아웃소싱 저해 요소와 해결 방안 등 전반적인 IT 아웃소싱 전략과 운영을 살펴보았다. 국내 주요 기업들의 데이터 센터는 IT 유지 보수, 인프라 기반 운영 등의 업무를 아웃소싱 대상 업무에, 그리고 IT 기획 전략 컨설팅, 시스템 기획 개발 등의 업무는 인소싱(in-house sourcing) 업무로 분류하고 있었다. 또한 IT 아웃소싱 결정 요인으로 내부직원의 역량, 비용, 리스크 등이 있었고, 정량적인 분석보다는 정성적인 판단에 의해 아웃소싱을 결정하고 있었다.

• Journal of Korean Society for Quality Management
• /
• v.42 no.3
• /
• pp.497-508
• /
• 2014

Purpose: The purpose of this study is to show whether there is a relationship between companies that promote CSR and hire indirectly as opposed to companies that only hire directly. Research results show that it is actually beneficial for the economy when companies implement the CSR, especially during times of economic recession. Methods: We have used data by collecting from the top 100 companies in Korea, which are the number of permanent employees, stock market registrations, companies that implemented the CSR, hiring directly and indirectly, etc., and analyzed them to carry out the regression analysis. Results: Research has shown that when companies implement the CSR and has many permanent employees, they also tend to hire employees indirectly. Conclusion: In the views of the whole economy, utilizing indirect hiring of employees can be a useful alternative, which can be accomplished by implementing CSR, and it must be recognized as the reason for producing more job opportunities within economies.

• IE interfaces
• /
• v.17 no.1
• /
• pp.71-77
• /
• 2004

At the present time, container transportation plays a key role in the international logistics and the efforts to increase the productivity of container logistics become essential for Korean trucking companies to survive in the domestic as well as global competition. This study suggests an approach for determining fleet size for container road transportation with dynamic demand. Usually the vehicles operated by the transportation trucking companies in Korea can be classified into three types depending on the ways how their expenses occur; company-owned truck, mandated truck which is owned by outsider who entrust the company with its operation, and rented vehicle (outsourcing). Annually the trucking companies should decide how many company-owned and mandated trucks will be operated considering vehicle types and the transportation demands. With the forecasted monthly data for the volume of containers to be transported a year, a heuristic algorithm using tabu search is developed to determine the number of company-owned trucks, mandated trucks, and rented trucks in order to minimize the expected annual operating cost. The idea of the algorithm is based on both the aggregate production planning (APP) and the pickup-and-delivery problem (PDP). Finally the algorithm is tested for the problem how the trucking company determines the fleet size for transporting containers.

• The Journal of Asian Finance, Economics and Business
• /
• v.7 no.7
• /
• pp.555-563
• /
• 2020

The study seeks to investigate the relationship between knowledge sharing and innovation in garment and textile enterprises. While previous research has found many factors influencing knowledge sharing, little research has been done about the influence of knowledge sharing on innovation in enterprises in developing countries like Vietnam. In particular, the textile industry plays an important role in export, but outsourcing is accounting for a high proportion of trade; it is necessary to increase innovation in order to increase the competitive advantage by internal capacity. The data is collected from a survey of 245 employees at 20 textile and garment enterprises in Vietnam to study the knowledge sharing influence on innovation. The methodology includes pilot study and quantitative method. The pilot study tests the questionnaire on the respondents. The quantitative method applies SEM analysis to measure the knowledge sharing influence on innovation. The results identify eight factors that positively impact knowledge sharing: rewarding, teamwork, management support, joy of knowledge sharing, communication, trust, commitment, and information technology. This study also shows that knowledge sharing affects innovation. The main findings are discussed for textile and garment enterprises to apply innovative capacity in the context of increasing global integration.

• Journal of the Korea Safety Management & Science
• /
• v.15 no.1
• /
• pp.193-198
• /
• 2013

Warehouse Management System was a helper of business in past, but it is perceived as a core competitive power and a tool for generating new business. It have been come out some new prospects for WMS due to generalization of global outsourcing and extension of the range of supply chain. In China, H automobile company construct the new WMS for providing the production extension and increment of part demand for A/S. This paper deals with the location management in warehouse, warehouse management, delivery management of goods from a warehouse, inventory management organizing WMS for construction of A/S warehouse in H motor in China. Then we identified the several problems of existing warehouse and constructed the driving organization and methods for overcoming these problems. We continually gather data for analysing the effects of new A/S warehouse and WMS construction.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.10 no.1
• /
• pp.157-167
• /
• 2014

Increasing productivity of knowledge workers is a significant issue in the 21st century referred as knowledge-based society. The core key word is behavior of knowledge transfer among members of an organization. The objective of this study is to investigate a model based on Triandis theory and Social Capital theory. This explored the antecedent factors of knowledge Transfer in ITO(Information Technology Outsourcing) Organization. Data were derived from 42 respondents working IT Cooperation in Seoul, Korea. In this paper, we introduce the research model for the knowledge transfer. In order to validate the proposed research model, social network analysis tool, UCINET, a structural equation modeling tool, SmartPLS, was utilized. The empirical result showed that, all antecedent factors (intention of knowledge sharing, anticipated reciprocal relationships, subjective norm, closeness network centrality) of knowledge transfer behavior were significant. In conclusion, findings and implications were discussed and limitations of the study and future research directions were suggested.