• International Journal of Reliability and Applications
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• 제1권1호
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• pp.81-87
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• 2000

One of the most important quantities in reliability theory is the expected number of renewals of a system during a given interval. This quantity, the renewal function, is used to determine the optimal preventive maintenance policy and to estimate the cost of a warranty. In this paper we study a parametric approach for a renewal function. The simulation study is presented to compare the relative performance of the introduced estimators of a renewal function. And we show that the proposed parametric estimator performs well.

• 한국경영과학회지
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• 제30권2호
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• pp.185-199
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• 2005

With the growth of internet shopping malls, there is increasing interest in comparison shopping mall. However most comparison sites compare only book prices by collecting simple XML data and do not provide .the exact comparison Including precise shipping costs. Shipping costs vary depending on each customer's address, the delivery method, and the category of selected goods, so rule based system is required in order to calculate exact shipping costs. Therefore, we designed and implemented comparison shopping mall which compares not only book prices but also shipping costs using rule based inference. By adopting the extensible Rule Markup language (XRML) approach, we proposed the methodology of extracting delivery rules from Web pages of each shopping mall. The XRML approach can facilitate nearly automatic rule extraction from Web pages and consistency maintenance between Web pages and rule base. We developed a ConsiderD system which applies our rule acquisition methodology based on XRML. The objective of the ConsiderD system is to compare the exact total cost of books including the delivery cost over Amazon.com, BarnesandNoble.com, and Powells.com. With this prototype, we conducted an experiment to show the potential of automatic rule acquisition from Web pages and illustrate the effect of delivery cost.

• 대한조선학회논문집
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• 제54권1호
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• pp.57-62
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• 2017

These days, shipbuilding companies are making an effort to adopt the IT technology in order to improve the production efficiency. One such effort is to utilize a planning and scheduling system to predict the production cost in advance. In this system, assessing the welding material quantity is an important factor. Unfortunately, obtaining the welding material quantity in the early design stage is extremely difficult because the detailed production information, which is essential in deriving the cost associated with welding, is normally available at a later stage. This paper aims at developing a computerized program that produces an index to estimate the welding material quantity in the early design stage. By using only three-dimensional geometric information, the program analyzes the production process and estimates the welding material quantity at any design or production stage when no production information is available. The results can be used for the planning and scheduling system.

• 한국조경학회지
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• 제22권1호
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• pp.1-16
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• 1994

This paper examines the individual and social values of tour and recreation activities related to the characteristics and attractions of parks in urban area through a questionnaire. The data for this research consists of 2,942 samples based on interviews in sixteen parks in Daegu area. Implications of the findings for urban parks design and tour and recreation policy are discussed. Travel cost method and contingent valuation method are applied essentially. These methods yield a reasonable estimation of the relationship between tour and recreation values of the parks and the visit rate which can be used to estimate demand functions for tour and recreation experiences provided by a site. Semilog-type models can be used to estimate the use of the park. Finally, the tour and recreation value of each park per user-day is estimated by the total experiences of the users. This study is a modest but important step in the investigation of urban parks and recreation site demand and values. Many of the developments in contingent valuation method and travel cost modeling should now be applied to the urban scale parks and recreation sits. Such studies will contribute significantly to the improvement of methodology for tour and recreation values measuring, especially to individual and social benefits for the urban parks, and provide the much needed guidance for the allocation of scarce tour and recreation resources.

• 한국통신학회논문지
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• 제29권11C호
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• pp.1541-1550
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• 2004

본 논문에서는 다해상도 움직임 추정 알고리즘을 이용하여 모션 리터를 검색하는 고속 다해상도 움직임 추정기에 대한 하드웨어 구조를 제안한다. 동영상 압축기술인 MPEG-4 AVC 전체 구성 중에서 핵심 부분인 움직임 추정 모듈을 하드웨어로 설계하기 위하여 기본적인 구조를 구성하고 높은 화질로 실시간 부호화를 할 수 있도록 고속 움직임 검색을 위해 특수하게 설계된 램 구주 메모리 공유, 4화소x4화소 Motion Vector 추출 등과 같은 기술들을 사용하여 전체 움직임 검색기를 구현하였다. 구현된 전체 모듈은 Altera(사)의 Excalibur 디바이스를 이용한 FPGA 구성을 통해 검증하고 최종적으로 Samsung STD130 0.18um CMOS Cell Library를 이용하며 합성 및 검증을 하였다. 이렇게 검증된 구조의 성능은 ASIC으로 구현할 경우 최대 동작 주파수가 약 140MHz이며 QCIF(176화소x144화소) 사이즈 기준으로 초당 약 1100프레임, 4CIF(704화소x576화구 사이즈 기준으로 초당 약 70프레임의 움직임을 검색할 수 있다 본 성능은 하드웨어 기반의 MPEG-4 AVC 실시간 부호화기를 설계하기에 적합한 구조임을 보여준다.

• IEIE Transactions on Smart Processing and Computing
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• 제3권2호
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• pp.41-51
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• 2014

This paper describes a method to estimate the noise power using the minimum statistics approach, which was originally proposed for audio processing. The proposed minimum statistics-based method separates a noisy image into multiple frequency bands using the three-level discrete wavelet transform. By assuming that the output of the high-pass filter contains both signal detail and noise, the proposed algorithm extracts the region of pure noise from the high frequency band using an appropriate threshold. The region of pure noise, which is free from the signal detail part and the DC component, is well suited for minimum statistics condition, where the noise power can be extracted easily. The proposed algorithm reduces the computational load significantly through the use of a simple processing architecture without iteration with an estimation accuracy greater than 90% for strong noise at 0 to 40dB SNR of the input image. Furthermore, the well restored image can be obtained using the estimated noise power information in parametric image restoration algorithms, such as the classical parametric Wiener or ForWaRD image restoration filters. The experimental results show that the proposed algorithm can estimate the noise power accurately, and is particularly suitable for fast, low-cost image restoration or enhancement applications.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제20권3호
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• pp.41-48
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• 2014

Purpose: At the moment, a lot of Public Hospitals in Korea have adopted 5 or 6 bedrooms as a standard multi-bedroom type. However 5-6 bedrooms have many problems related to inpatient satisfaction and nosocomial diseases. Therefore 4 bedroom is under considering for standard multi-bed room in Public Hospitals in Korea. This paper tries to prove that adoption of 4 bedroom in Public Hospitals has nothing to do with economic loss which is now an obstacle in adopting 4 bedrooms. Methods: 3 Methods have been used in this paper. 1) Comparative analysis between medical insurance fee and service cost for hospitalization has been conducted through literature survey. 2) Scenario analysis has been used for the estimation of inpatient number when 4 bedrooms are adopted in Public Hospitals. 3) Relation analysis between profit and proportion of 4 bedroom in Public Hospitals. Results: Adoption of 4 bedroom as a standard multi-bedroom in Public Hospitals has been proved to have nothing to do with the economic loss of hospitals. Implications: It is necessary to introduce and expand 4 bedrooms instead of 5-6 bedrooms in hospitals for the upgrade of hospital environment and easy control of cross infection in inpatient bedrooms.

• 한국CDE학회논문집
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• 제21권2호
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• pp.130-142
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• 2016

BIM library, as a systematic collection of BIM objects where the building information is stored, is a vital factor to construct the BIM based work environment. However, construction business is faced the problems relating BIM library such as the absence of the standard for establishing BIM library, the discontinuity of BIM library's compatibility and the lack of practice applicable BIM library. These problems cause the decreasing work efficiency and the recreating BIM model, by delivering inefficient information required in each stage and application field. The purpose of this study is to suggest the integrated management system for property information of BIM library in order to minimize the reworking and to manage information of each stage and application field when exchanging and sharing information. To achieve this, the BIM information classification, the criteria of property requirements for information exchange in BIM application field and the BIM library management system are developed. This study could contributes to ensuring the reliability and accuracy of results of BIM based analysis and to enhancing the speed of business process with sharing and exchanging building information utilizing a single BIM model.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.490-497
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• 2007

Since the foreign currency crisis, Korean economy has suffered recession and the government launches residence and real estate policy in order to increase the demand and trade of real estate and to help the economy revitalization. 1 As a result, the rate of economy growth is shown the high increase with the figure of 10.9% in 1999 and 8.8% in 2000. However, it brings overheating market as a negative effect. Although, the government established the policy for the control of speculation, the policy causes instability of economy. This study is to analyze the effect between the residence policy and the housing cost since the foreign currency crisis through housing sale price estimation and housing lease price estimation and is to apply the basis data of the next residence policy.

• 대한전자공학회논문지SD
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• 제44권11호
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• pp.137-141
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• 2007

본 논문에서는 2개의 안테나를 사용하는 MB-OFDM UWB시스템에서, MUSIC 알고리듬에 기초한 입사각 추정기의 효율적인 하드웨어 구조에 대한 설계 방법을 제안한다. 제안된 방식에서는 기존 알고리듬의 연산 수식을 변형하여 기존 알고리듬에서 요구하는 복잡한 연산기능을 제거하였으며, 따라서 제안된 방식이 기존과 거의 유사한 성능을 가지면서도 하드웨어복잡도 및 연산소비전력을 크게 줄일 수 있었다. 제안된 구조는 Verilog HDL을 이용하여 설계 및 검증되었으며, 하드웨어 복잡도 및 소비전력 측정을 위해 각각 0.13um CMOS 라이브러리와 Xilinx FPGA로 구현되었다. 게이트카운트 및 소비전력을 측정한 결과, 원래의 MUSIC 알고리듬을 그대로 구현한 방식과 비교하여, 게이트카운트에서는 약 43%, 소비전력에서는 약 23%가 감소되었을 확인할 수 있었다.