• 산업공학
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• 제13권3호
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• pp.444-454
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• 2000

Due to the improvement of modern information technologies, sharing stock information among the supply chain members is a common practice nowadays. Many companies are planning to adopt the information systems to possess the real-time shared stock information. Thus, it is needed to quantify the value of shared stock information. The purpose of this paper is to evaluate the value of the shared stock information for two-echelon distribution systems. Existing reorder policies can be classified into installation stock policies and echelon stock policies. Since installation stock policies do not utilize the shared stock information, and both classes of policies may show poor performances for distribution systems, we cannot evaluate the value of the shared stock information with the existing policies. Thus, we provide a new type of reorder policy, named order risk policy. We define the order risk using marginal analysis, and prove the optimality. Through computational experiment that compares the order risk policy with the existing policies, it is shown that a significant cost reduction is achieved with the effective utilization of the shared stock information. We also show the effect of the system characteristics on the value of the shared stock information.

• 한국경영과학회지
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• 제37권3호
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• pp.95-116
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• 2012

The purpose of this paper is to show the effect of information sharing strategy on the supply chain performances. While traditional information sharing models assumed centralized stock information, recent supply chain practices often implement fully shared stock information, where real-time stock information is accessible on retailers. When retailers are competing with each other, this fully shared stock information may incur retailers' strategic order behaviors. Thus, this paper analyzes a simple two-level supply chain consisting of one warehouse and two identical competing retailers where the real time stock information is fully shared. The warehouse uses the traditional echelon stock policy. Under this environment the retailers' reorder decisions are derived using the order risk concept and the retailer competition mechanism is analyzed. Computational results show that the supply chain performace degradation in the fully shared stock information is quite significant, implying the importance of designing information sharing strategies in the supply chain design phase.

• Journal of Information Processing Systems
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• 제19권2호
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• pp.219-231
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• 2023

Intelligent applications are crucial for increasing the popularity of shared urban electric bicycles (EBs). Building an application platform architectural system that can satisfy independent user operations is critical for increasing the intelligent usage of shared EBs. Consequently, we collected online reviews of shared EB applications, conducted semantic processing and sentiment analysis, and refined the positive and negative review data for each function. The positive and negative review indices of each function were calculated using the formulae for positive and negative review indices of product functions, thereby determining the functions that need to be improved. Each function of the Shared EB application was improved according to its business process. The main contributions of this study are to build a user requirement architecture system for the Shared EB application with five dimensions and 22 functions using the Delphi method to design the user interface (UI) of this application based on user satisfaction evaluation results; to create a high-fidelity dynamic interaction prototype and compare user satisfaction before and after improving the Shared EB application functions. The testing results indicate that the changes in the UI significantly improve the user experience satisfaction of the urban Shared EB application, with the positive experience index increasing by 69.21% and the negative experience index decreasing by 75.85% overall. This information can be directly used by relevant companies to improve the functions of the Shared EB application.

• 한국정보과학회논문지:데이타베이스
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• 제35권5호
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• pp.411-420
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• 2008

웹 환경에서 정보 표현과 교환을 위한 표준 방식으로 널리 사용되고 있는 XML 문서의 양은 급속히 증가하고 있으며, 대용량의 XML 문서도 많이 생산된다. 이러한 XML 문서들을 RDBMS에 효율적으로 저장하고 검색하는 연구가 활발히 진행되어 왔는데 이들 연구들 중에서 Shared Inlining 저장 방법이 높은 검색 효율을 보인다. Shared Inlining 방법은 DTD의 정보를 분석하여 XML 문서를 노드의 성분별로 분할하여 관계형 데이타베이스로 저장하는 기법이다. 본 논문은 기존의 Shared Inlining 방법에서 여러 하위 노드를 가지는 엘리먼트에서 발생되는 중첩 문제를 해결하기 위한 기법을 제안한다. 이 방법에서는 DTD 정의에 맞게 XML 문서를 Shared Inlining 구조로 저장하고 검색의 정확성을 높인다.

• Journal of Communications and Networks
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• 제10권3호
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• pp.331-337
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• 2008

In this paper, we investigate survivability in wavelength division multiplexing (WDM) mesh networks and propose a new algorithm called improved shared-path protection (ISPP) to completely tolerate the double-link failures. Compared with previous algorithms for protecting double-link failures, i.e., shared-path protection (SPP) and shared-link protection (SLP), the advantage of ISPP is to allow primary paths and backup paths to share the mixed wavelength-links based on the proposed new rules in which some primary wavelength-links can be changed to mixed wavelength-links, which can be shared by primary paths and backup paths. In addition, some mixed wavelength-links also can be shared by different backup paths for saving resources. Simulation results show that ISPP algorithm performs better in resource utilization ratio and blocking probability than conventional SPP and SLP algorithms.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권7호
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• pp.3319-3338
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• 2016

Cloud storage is becoming more and more popular because of its elasticity and pay-as-you-go storage service manner. In some cloud storage scenarios, the data that are stored in the cloud may be shared by a group of users. To verify the integrity of cloud data in this kind of applications, many auditing schemes for shared cloud data have been proposed. However, all of these schemes do not consider the access authorization problem for users, which makes the revoked users still able to access the shared cloud data belonging to the group. In order to deal with this problem, we propose a novel public auditing scheme for shared cloud data in this paper. Different from previous work, in our scheme, the user in a group cannot any longer access the shared cloud data belonging to this group once this user is revoked. In addition, we propose a new random masking technique to make our scheme preserve both data privacy and identity privacy. Furthermore, our scheme supports to enroll a new user in a group and revoke an old user from a group. We analyze the security of the proposed scheme and justify its performance by concrete implementations.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제12권7호
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• pp.217-226
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• 2023

공유 전동킥보드의 사용이 급증하면서 공유 모빌리티의 불법 주차 사례가 많이 발생하고 있다. 이 문제를 해결하기 위해 지자체에서는 불법 주차된 공유 전동킥보드 견인 등의 조치를 취하고 있지만 악의적인 이용자에 대한 관리는 이루어지지 않고 있으며 비효율적인 방안이다. 이에 따라 본 논문에서는 블록체인 기반의 공유 전동킥보드 이용자 관리 모델을 제안한다. 공유 전동킥보드에는 주차 상태를 확인할 수 있는 카메라 센서, GPS 등이 탑재되어 있으며 이용자가 공유 전동킥보드 이용을 종료를 하게 되면 반납 시 주차 상태에 대한 정보를 탑재된 센서들을 통해 수집하여 공유 전동킥보드 회사가 이용자가 올바르게 주차했는지 확인할 수 있다. 또한 이용자의 주차 내역에 따라 신뢰점수를 부여하고 신뢰점수에 따라 인센티브를 지급하여 이용자가 스스로 공유 전동킥보드를 올바르게 반납할 수 있도록 유도한다. 해당 정보들은 공유 전동킥보드 회사들이 참여하는 컨소시엄 블록체인을 통해 공유되어 공유 전동킥보드 회사들의 통합적인 이용자 관리가 가능하다.

• Asia pacific journal of information systems
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• 제13권1호
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• pp.197-211
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• 2003

Intensified competition, splintered mass market, shortened product life cycles, and advanced technology and automation let companies to crease the IT investment to meet the changes, Although IT investment increased, IS didn't show the visible outcome. One of the major interest of IS managers is how to demonstrate the business value of the firm's investment in information technology. This paper proposes the revised model of Nelson & Cooprider(1990) regarding shared knowledge between IS and line groups. Knowledge can be shared through mutual trust, mutual influence and communication between these two groups. The revised model including communication is tested empirically using LISREL. The results show that shared knowledge mediated the relationship between IS performance and mutual trust, mutual influence and communication. And shared knowledge between IS and line groups increase IS performance. IS managers should develop mutual trust, mutual influence and communication between these groups to achieve more shared knowledge and higher IS performance.

• 정보관리학회지
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• 제14권1호
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• pp.183-206
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• 1997

본 연구는 정보검색용 표준 프로토콜인 Z39.50을 공동편목에 응용하기 위하여 Z39.50의 발전과정과 제반기능에 대하여 살펴보고, Z39.50의 속성과 데이터베이스 갱신서비스를 토대로 Z39.50 공동편목 게이트웨이 모형을 설계하였다. 이 게이트웨이는 국내교육.연구도서관 서지협력망의 온라인 공동편목시스템을 대상으로 하였다. 본 연구에서 설계된 두가지 측면의 Z39.50공동편목 게이트웨이, 즉 중앙집중형 공동편목 게이트웨이와 분산형 공동편목 게이트웨이 모형은 기본적으로 웹서버에서 동작하며 이용자 접근이 쉬운 웹브라우저를 통하여 접근할 수 있도록 설계하였다.

• 한국정보통신학회논문지
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• 제12권8호
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• pp.1448-1455
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• 2008

본 논문은 대부분의 Linux 운영체제에서 지원해 주는 System V의 IPC 중 하나인 Shared Memory를 Dual Core 시스템 상에서 동작하도록 설계한다. Linux에서 사용되는 Shared Memory는 동일한 메모리 영역에 여러 개의 프로세스가 접근할 수 있도록 해 주는 기술이 다. 본 논문에서는 Shared Memory의 큰 두 갈래 중 커널 단계에서 처리되는 SVR(System V Release) 형식의 Shared Memory를 다룬다. 본 논문에서는 리눅스 운영체제의 공유 메모리 기능을 Dual Core 시스템에서 동작하도록 설계한다. 본 논문에서 제안하는 Dual Core 시스템에서 공유 메모리 기능 설계 방안은 듀얼 코어를 활용하여 기존의 단일 처리기 시스템에서보다 성능을 향상시킬 수 있도록 한다. 공유 메모리를 이용한 프로세스의 동작이 별개의 CPU에서 동작되도록 함으로써 성능 향상을 꾀한다.