• Title/Summary/Keyword: escalation method

Search Result 48, Processing Time 0.031 seconds

Economic Analysis of Heat Pump System through Actual Operation (히트 펌프 냉난방 시스템의 실사용을 통한 경제성 분석)

  • Shin, Gyu-Won;Kim, Gil-Tae;Joo, Ho-Young;Lee, Jae-Keun
    • Proceedings of the SAREK Conference
    • /
    • 2006.06a
    • /
    • pp.921-926
    • /
    • 2006
  • The present study has been conducted economic analysis through actual operation of EHP and GHP which are installed at the same building of an university Cost items, such as initial cost, annual energy cost and maintenance cost of each system are considered to analyze LCC and economical efficiency is compared. The initial cost is considered on the basis of actual costs, and annual energy cost is converted into the cost after measuring electricity and gas consumption a day. LCC applied present value method is used to assess economical efficiency of both them. Variables used to LCC analysis are electricity cost escalation rate, natural gas cost escalation rate, interest rate, and service lives and when each of them are 4%, 2%, 8%, and 20 years, results of analysis short that EHP(148,257,306 won) is 8.05%(12,981,990 won) more profitable than GHP(161,239,295 won).

  • PDF

An Improvement Plan of Contract Price Adjustment through the Problem Analysis of the Current Price Escalation Regulation in Construction Projects (현행 건설공사 물가변동 제도의 문제점 분석을 통한 계약금액조정 개선방안)

  • Park, Yang-Ho;Kown, Beom-Jun;Kim, Yong-Su
    • Proceedings of the Korean Institute Of Construction Engineering and Management
    • /
    • 2006.11a
    • /
    • pp.435-439
    • /
    • 2006
  • The purposes of study is to propose a new method contract price adjustment in construction projects. The research method of this study includes a case analysis and questionnaire survey. The results of this study are as follows: 1) For improvement method of contract amount adjustment, enactment for legislation pertaining to computation methods such as military's organization through total unit cost, and price flexibility computation at the point of design modification were presented. 2) Arithmetic formulas for cases in which volume is deleted or modified below the price flexibility exemption amount or in which there is no change to quantity, at the occurrence of design modification resulting from price flexibility, were proposed.

  • PDF

Introduction of Fire Protection Technology and Its Design Method of Offshore Facilities (해양플랜트의 방화대책 및 설계기술 소개)

  • Koo, Myeong Jun;Choi, Jae Woong;Yoon, Ho Byung
    • Transactions of the KSME C: Technology and Education
    • /
    • v.1 no.1
    • /
    • pp.49-57
    • /
    • 2013
  • The dimensioning accidental loads have been selected through suitable quantitative risk assessment and generally utilized important factors for offshore facility design. The fire hazard can be quantified with dimensioning fire loads. The main purposes of fire protection are to maintain the functionality of safety systems within evacuation period and to prevent the escalation from initial fire to uncontrolled catastrophic fire. This paper introduces the applications and the design methods of active and passive fire protections as representative measures of fire protection of offshore facilities. The passive fire protection requires the high initial installation cost and much difficulty on the operation of facilities and their maintenance. The oil major clients have asked the design contractors of offshore facilities to optimize the amount of passive fire protection with relevant engineering technology recently.

Long-term tolerance and outcomes for dose escalation in early salvage post-prostatectomy radiation therapy

  • Safdieh, Joseph J.;Schwartz, David;Weiner, Joseph;Weiss, Jeffrey P.;Rineer, Justin;Madeb, Isaac;Rotman, Marvin;Schreiber, David
    • Radiation Oncology Journal
    • /
    • v.32 no.3
    • /
    • pp.179-186
    • /
    • 2014
  • Purpose: To study the long-term outcomes and tolerance in our patients who received dose escalated radiotherapy in the early salvage post-prostatectomy setting. Materials and Methods: The medical records of 54 consecutive patients who underwent radical prostatectomy subsequently followed by salvage radiation therapy (SRT) to the prostate bed between 2003-2010 were analyzed. Patients included were required to have a pre-radiation prostate specific antigen level (PSA) of 2 ng/mL or less. The median SRT dose was 70.2 Gy. Biochemical failure after salvage radiation was defined as a PSA level >0.2 ng/mL. Biochemical control and survival endpoints were analyzed using the Kaplan-Meier method. Univariate and multivariate Cox regression analysis were used to identify the potential impact of confounding factors on outcomes. Results: The median pre-SRT PSA was 0.45 ng/mL and the median follow-up time was 71 months. The 4- and 7-year actuarial biochemical control rates were 75.7% and 63.2%, respectively. The actuarial 4- and 7-year distant metastasis-free survival was 93.7% and 87.0%, respectively, and the actuarial 7-year prostate cancer specific survival was 94.9%. Grade 3 late genitourinary toxicity developed in 14 patients (25.9%), while grade 4 late genitourinary toxicity developed in 2 patients (3.7%). Grade 3 late gastrointestinal toxicity developed in 1 patient (1.9%), and grade 4 late gastrointestinal toxicity developed in 1 patient (1.9%). Conclusion: In this series with long-term follow-up, early SRT provided outcomes and toxicity profiles similar to those reported from the three major randomized trials studying adjuvant radiation therapy.

Economic Analysis of Heat Pump System through Actual Operation (교육 시설에서의 히트 펌프 냉난방 시스템 실사용을 통한 경제성 분석)

  • Kim, Gil-Tae;Cheong, Seong-Ir;Joo, Ho-Young;Ahn, Young-Chull;Lee, Jae-Keun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.19 no.6
    • /
    • pp.470-475
    • /
    • 2007
  • The present study has been conducted economic analysis through actual operation of electric heat pump (EHP) and gas engine driven heat pump (GHP) which are installed at the same building in the university. Cost items, such as initial cost, annual energy cost and maintenance cost of each system are considered to analyze life cycle cost (LCC) and economical efficiencies are compared. The initial cost is considered on the basis of actual cost, and annual energy cost is converted into the cost after measuring electricity and gas consumption a day LCC applied present value method is used to assess economical profit of both of them. Variables used to LCC analysis are electricity cost escalation rate, natural gas cost escalation rate, interest rate, and service lives when each of them are 4%, 2%, 8%, and 20 years. The result shows that EHP (148,257,306 won) is more profitable than GHP (161,239,296 won) by 8.05% (12,981,990 won).

An Effect Analysis of Lead Time Changes on Investment Evaluation of a Nuclear Power Plant Construction : A Trade-Off Analysis Between a Construction Cost and Lead Time (원자력발전소 건설 리드타임의 변화가 투자프로젝트 평가에 미치는 효과분석: 발전소 건설비용과 리드타임 간의 상쇄효과분석)

  • Kim, Gyu-Tai;Lee, Byung-Gook;Oh, Chi-Jae
    • IE interfaces
    • /
    • v.12 no.3
    • /
    • pp.414-423
    • /
    • 1999
  • A nuclear power plant requires a huge amount of initial investment and long construction lead time. As we expect that there may exist a relationship between investment and construction lead time, a number of researchers have reported that nearly a half of investments is incurred due to time factors such as the time value of money and inflation or escalation rates. Therefore, we investigated in this paper a relationship between the initial investment and the construction lead time of a nuclear power plant construction, and proposed a method for a trade-off analysis between the annual equivalent worth and the investment alternatives to reduce the construction lead time. Finally, we presented a real case to numerically explain the steps of the method presented in this paper.

  • PDF

Improvement on the Managerial Method of Price Fluctuation System (물가변동제도 운영방식 개선방안)

  • Lee, Jae-Seob;Shin, Young-Chul
    • Korean Journal of Construction Engineering and Management
    • /
    • v.12 no.2
    • /
    • pp.3-11
    • /
    • 2011
  • There are several causes to recalculate the contract amount in public construction projects. Among them, the escalation clause was introduced in 1969 and now the condition to recalculate the cost is effective after 90 days from the date of contract and the rate of fluctuation should be more than 3% from the date of bidding. The two calculation methods for the rate of fluctuation are item-adjustment and index-adjustment. According to the results of investigation into 4 public institutions and 163 projects, all of them have used the method of index-adjustment and the rate of projects that spend over 6 months obtaining the approval of contract amount adjustment is more than 90%. The reason for spending lots of time is caused by problems of the calculation method on the price fluctuation rate. Therefore, it is necessary that the calculation method should be diversified to cope with the problems and a option of the builder should be expanded as well. Furthermore, if the way to apply correction factors to construction price index and average index based on the producer and consumer price index made by the bank of Korea is added, then the duration will be reduced without additional expenses. This study proposed the diversification of the calculation method using price fluctuation rate and builders' expanded options as improvement on the managerial method of Price Fluctuation System for the prompt and efficient contract amount adjustment.

A Study on the Simplified Economics Evaluation Method for Selecting a Heat Source System at the Pre-design Phase (초기계획단계에서 열원시스템 선정을 위한 경제성 간이 평가법에 관한 연구)

  • Park Yool;Park Jong-Il
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.16 no.11
    • /
    • pp.1060-1067
    • /
    • 2004
  • To apply an analysis method of life cycle cost when assessing economics of equipment system, we should basically set up preconditions such as useful life, price escalation rate, interest rate, etc. as well as consider a calculation algorism of source energy and heat source system, which is a complex process for life cycle costing. For this reason, equipment designers tend to plan heat source systems, without a thorough investigation on economics of alternative systems at the pre-design phase. In this process, architectural designers should adopt a proper heat source system, which is one of the most important factors for planning an appropriate architectural design, through a discussion with equipment designers in a short time. In order to offer an evaluation method for equipment designers to analyze economics of an alternative heat source system easily at the pre-design phase, this research would define the simplified economics, evaluation method through analysis of existing papers for economics evaluation, and examine validity through comparison of simplified method values ($LCC_{EC}$) and life cycle costing values ($LCC_{15}$) for six alternative heat source systems.

A Conceptual Investment Cost Estimation Using by Cost Indices for the Train Control Facility of High-speed Rail Project (원가지수를 이용한 고속철도 설비의 개략적 투자비 추정기법)

  • Lee, Young-Joo;Lee, Yong-Eok;Jang, Seong-Yong
    • Journal of the Korean Society for Railway
    • /
    • v.14 no.2
    • /
    • pp.194-202
    • /
    • 2011
  • Most of Orders of Magnitude estimate are based on historical data. This data is converted to the current price using by the cost index method mainly. This method, however, is rarely utilized or only for one-time use due to the lack of data and the complex escalation calculation method. This paper present a typical process on the conceptual investment cost estimation using by Cost Indexes based on the actual case for the Train Control facility of High-speed rail project. The result is expected to serve as both an easy way for Order of Magnitude estimate and a standard guideline for computerized modeling.

A Study on Privilege Elevation Attack Management for Smart Transaction Security on BlockChain Etherium Based System

  • Min, Youn-A
    • Journal of the Korea Society of Computer and Information
    • /
    • v.24 no.4
    • /
    • pp.65-71
    • /
    • 2019
  • IAs smart device penetration rate is more than 90%, mobile transaction ratio using smart device is increasing. Smart contracts are used in various areas of real life including smart trading. By applying smart contracts to the platform for smart transactions through block-chain technology, the threat of hacking or forgery can be reduced. However, various threats to devices in smart transactions can pose a threat to the use of block chain Etherium, an important element in privilege and personal information management. Smart contract used in block chain Ethereum includes important information or transaction details of users. Therefore, in case of an attack of privilege elevation, it is very likely to exploit transaction details or forge or tamper with personal information inquiry. In this paper, we propose a detection and countermeasure method for privilege escalation attack, which is especially important for block chain for secure smart transaction using block chain Ethereum. When comparing the results of this study with the results of similar applications and researches, we showed about 12~13% improvement in performance and suggested the future countermeasures through packet analysis.