• Journal of the Korean Data and Information Science Society
• /
• 제17권1호
• /
• pp.195-204
• /
• 2006

In this paper, we consider a renewal process in which both the inter-arrival times and rewards are fuzzy random variables. We prove the uniform levelwise convergence of fuzzy renewal and fuzzy renewal rewards. These results improve the result of Popova and Wu[European J. Oper. Research 117(1999), 606-617] and the main result of Hwang [Fuzzy Sets and Systems 116 (2000), 237-244].

• 한국측량학회:학술대회논문집
• /
• 한국측량학회 2003년도 춘계학술발표회 논문집
• /
• pp.479-484
• /
• 2003

The renewal of digital map takes much time and the manual process. LiDAR data allows reduction of time, automatic manner, and acquisition of the precise position. So it is used to renew the digital map of 1:5,000 scale. From the accuracy test results using aerial imagery and digitizing, renewal of digital map are feasible in automatic manner to some extent.

• International Journal of Reliability and Applications
• /
• 제4권3호
• /
• pp.113-129
• /
• 2003

Based on moments inequalities new testing procedures are derived for testing exponentiality against new renewal better than used (NRBU) and renewal new better than used (RNBU). These classes play an important role in formulating repair or replacement policies. The asymptotic Pitman efficiency of (NRBU) and (RNBU) testes are studied. Selected critical values are tabulated for sample sizes n=5(1) 50. The power estimates for some commonly used life distributions in reliability are also calculated. Some set of real data is used as an example to elucidate the use of the proposed test statistic for practical reliability analysis. The problem in case of right-censored data is also handled.

• Journal of the Korean Data and Information Science Society
• /
• 제19권4호
• /
• pp.1345-1352
• /
• 2008

An inventory with constant demand is studied. We adopt a renewal argument to obtain the transient and stationary distribution of the level of the inventory. We show that the stationary distribution can be also derived by making use of either the level crossing technique or the renewal reward theorem. After assigning several managing costs to the inventory, we calculate the long-run average cost per unit time. A numerical example is illustrated to show how we optimize the inventory.

• Journal of the Korean Data and Information Science Society
• /
• 제16권1호
• /
• pp.165-172
• /
• 2005

In recently, Popova and Wu(1999) proved a theorem which presents the long-run average fuzzy reward per unit time. In this note, we improve this result. Indeed we will show uniform convergence of a renewal reward processes with respect to the level ${\alpha}$ modeled as a fuzzy random variables.

• 한국군사과학기술학회지
• /
• 제14권5호
• /
• pp.859-870
• /
• 2011

The purpose of this paper is to develop reliability analysis procedures for repairable systems with interval failure time data and apply the procedures for assessing the storage reliability of a subsystem of a certain type of guided missile. In the procedures, the interval failure time data are converted to pseudo failure times using the uniform random generation method, mid-point method or equispaced intervals method. Then, such analytic trend tests as Laplace, Lewis-Robinson, Pair-wise Comparison Nonparametric tests are used to determine whether the failure process follows a renewal or non-renewal process. Monte Carlo simulation experiments are conducted to compare the three conversion methods in terms of the statistical performance for each trend test when the underlying process is homogeneous Poisson, renewal, or non-homogeneous Poisson. The simulation results show that the uniform random generation method is best among the three. These results are applied to actual field data collected for a subsystem of a certain type of guided missile to identify its failure process and to estimate its mean time to failure and annual mean repair cost.

• 영어어문교육
• /
• 제16권3호
• /
• pp.81-99
• /
• 2010

The purpose of this paper is to report the process of curriculum renewal of an intensive English program with focus on the perceptions of the people involved. The researcher tries to describe the five years of curriculum change. The data collected through surveys, interviews, and observations were analyzed. The findings show that throughout the years, the students that participated in the program perceived that their English skills have improved. The teachers also thought that the student's overall English skills improved. The satisfaction on the chosen textbooks was higher in the student group than the teacher group. The main goal and objectives of the intensive English program in the study changed in the process of curriculum renewal. The program that launched in order to enhance students' conversational skills in 2004 started to include TOEIC instruction in late 2005 due to students' needs. The students were content with the fact that there were many teachers in the program whereas teachers had neutral opinion. The present study aims to suggest the importance of curriculum renewal through program evaluation which can be applied to similar language programs for the continuity and longevity of the programs.

• 한국지리정보학회지
• /
• 제11권1호
• /
• pp.138-154
• /
• 2008

1996년부터 3단계 국가GIS 5개년 계획이 시행되고 있는 현재까지 지리정보기술은 다양한 분야에 활용되고 있으나, 그 기술의 근간이 되는 지리공간자료의 최신성과 정확성을 확보할 수 있는 체계를 갖추지 못하고 있다. 지리공간자료(수치지형도, 수치주제도)와 관련된 업무는 지형지물의 변화 발생에서 부터 자료수집, DB 구축, 유통, 공유 등 모두가 개별적으로 이루어지고 있다. 이와 같은 개별구조를 하나의 흐름으로 연계하여 효율적이고 체계적인 업무처리가 이루어질 수 있도록 일관성 있는 모형개발이 요구되고 있다. 본 연구에서는 대구광역시를 사례로 지리공간자료의 경제적 갱신과 교환 방안을 제시하고, 기존의 업무수행 절차와 비교하여 비용편익분석을 실시하였으며, 그 결과를 이용하여 모형을 개발하였다.

• 스마트미디어저널
• /
• 제12권5호
• /
• pp.111-121
• /
• 2023

본 연구의 목적은 브랜드 관리 측면에서 로고가 브랜드 아이덴티티를 대변하는 중요한 시각적 도구로 보고 브랜드 수명주기에 따른 로고 리뉴얼 디자인 방법을 모색하는 것이다. 본 연구는 브랜드 수명주기와 브랜드 리뉴얼 전략에 대한 문헌연구와 로고 리뉴얼 디자인에 관한 전문가 설문, 브랜드의 수명주기를 판별 할 수 있는 통계자료가 있는 35개 식음료 브랜드의 로고 분석으로 진행되었다. 연구 결과는 크게 세 가지이다. 첫째, 네 단계(도입기, 성장기, 성숙기, 쇠퇴기)의 브랜드 수명주기의 특징과 리뉴얼 전략을 도출했다. 둘째, 네 가지 브랜드 리뉴얼 전략(부분변경, 전체변경, 리포지셔닝, 새 이미지 창출)과 수명주기를 기준으로 로고 리뉴얼 디자인 방향을 제안하였다. 이를 토대로 수명주기별 로고 리뉴얼 특징과 관계성을 제안하였다. 셋째, 브랜드 수명주기와 브랜드 리뉴얼 전략에 따라 중요하게 적용되는 아이덴티티 시각요소(그래픽 요소의 첨삭, 톤/매너, 서체, 시그니처 컬러 변경)를 발견했다. 성장기와 성숙기의 부분변경전략에 그래픽 요소의 첨삭과 톤 변경이 중요하며, 리포지셔닝 전략과 새이미지 창출에 시그니처 컬러 변경이 중요함을 발견했다.

• Journal of Information Technology Applications and Management
• /
• 제15권4호
• /
• pp.77-101
• /
• 2008

The market size of Internet portals has been continuously expanded and also competition has been fierce. For the business success of Internet portals, it is necessary to repeatedly perform a renewal project which improves their services, reflecting more improved or changed strategies. Accordingly, this paper proposes an analysis methodology for performing the renewal project more systematically and effectively. The methodology consists of four phases : establishing improved strategies, analyzing customers, deriving service alternatives, and determining services. The methodology places an emphasis on reflecting effectively customers' standpoints (i.e. customers' needs) and service providers' standpoints (i.e. business strategy) upon service improvement. Furthermore, the methodology includes a specific technique for analyzing the feasibility of services. To demonstrate the practical usefulness of the methodology, a real-life case is illustrated.