Recently, the mineral resource protection policies and regulations in production countries of natural resources including rare metals are becoming more stringent. Such environment makes which market has malfunction. In other word, those are not perfect or pure market. Therefore because each market of natural resources have special or unique characters, it is difficult to forecast their market prices. In this study, we constructed several models to estimate prices of natural resources using statistical tools like ARIMA and their business indices. And for examples, Indium and Coal were introduced.

The capability and cost effectiveness of UUV and USV bring to underwater survey, target detection and identification operations have been widely demonstrated and accepted in recent years. Future USV systems may deploy UUVs to gain the advantage of higher area coverage rates through multiple and simultaneous operations. In this paper, we present an architecture of USV and UUV for mine countermeasure with results of measures on effectiveness.

When the number of items of same type of industrial property is quite large, calculating depreciation for a group of such item may be more efficient than depreciating each item separately. Also, predicting the service life of a specific individual unit is very difficult to do with any degree of accuracy. Estimating the probable average service life (PASL) of many units (or dollars) is not an easy task; however, an average life of many units can probably be predicted with a much higher degree of accuracy than the life of some particular unit. Using the average of many units allows for some units having relatively short lives and some units having relatively long lives without specifying whether a particular unit will have a short or a long life. If the life of each vintage in an account are not estimated, then the broad group procedure can be used. The broad group procedure depreciates the several vintage in an account as a single group. The PASL for this procedure is the estimate of the average of lives of the individual dollars in the group. If the estimated PASL’s of the vintages are not the same, then a weighted average PASL would have to be calculated for each calendar year. In this paper, we illustrate the calculations of accrual rates and the annual depreciation charge for each of the calendar years by the broad group depreciation procedure.

During a flood season, Bo region could be easily exposed to flood due to increase of ground water level and the water drain difficulty even the water amount of Bo can be managed. GFI for the flood risk is measured by mean depth to water during a dry season and minimum depth to water and tangent degree during a flood season. In this paper, a forecasting model of the target variable, GFI and predictors as differences of height between ground water and Bo water, distances from water resource, and soil characteristics are obtained for the dry season of 2012 and the flood season of 2012 with empirical data of Gangjungbo and Hamanbo. Obtained forecasting model would be used for keep the value of GFI below the maximum allowance for no flooding during flooding seasons with controlling the values of significant predictors.

Recently, the mineral resource protection policies and regulations in production countries of natural resources including rare metals are becoming more stringent. Such environment makes which market has malfunction. In other word, those are not perfect or pure market. Therefore because each market of natural resources have special or unique characters, it is difficult to forecast their market prices. In this study, we constructed several models to estimate prices of natural resources using ARIMA and their business indices. And for examples, Indium and Coal were introduced.

Several different depreciation systems may be used for group depreciation. The vintage group procedure treats the same type of property placed in service during the same year as a distinct group for depreciation purposes; therefore an estimate of the probable average service life and net salvage ratio(s) of each individual vintage is necessary. The vintage group procedure calculates an accrual rate for each vintage and the accrual rate for an account for specific calendar year is the weighted average vintage accrual rate for that calendar year. A further refinement would be to divide each vintage into groups such that all of the dollars in a group have the same estimated life-an equal life group (ELG). Then each ELG is depreciated over its estimated life. The effect is to recover each dollar over the estimated number of years it is in service. Each vintage is divided into several equal life groups (ELGs) such that all the property in a specific ELG has the same estimated life. The accrual rate for each ELG is based on the estimated life of that ELG. The vintage accrual rate for a specific year is the weighted average ELG accrual rate for that calendar year. In this paper, we illustrate the calculations of vintage accrual rates for each of the calendar years by the ELG depreciation systems.

When monitoring an instrumental process, one often collects a host of data such as characteristic signals sent by a sensor in short time intervals. Characteristic data of short time intervals tend to be autocorrelated. In the instrumental processes often the practice of adjusting the setting value simply based on the previous one, so-called ‘adjacent point operation’, becomes more critical, since in the short run the deviations are harder to detect and in the long run they have amplified consequences. Stochastic modelling using ARIMA or AR models are not readily usable here. Due to the difficulty of dealing with autocorrelated data conventional practice is resorting to choosing the time interval where autocorrelation is weak enough then to using I-MR control chart to judge the process stability. In the autocorrelated instrumental processes it appears that using the Shewhart chart and the time interval data where autocorrelation is relatively not existent turns out to be a rather convenient and very useful practice to determine the process stability. However in the autocorrelated instrumental processes we intend to show that one would presumably do better using the EWMA control chart rather than just using the Shewhart chart along with some arbitrarily intervalled data, since the former is more sensitive to shifts given appropriate weights.

The methods for constructing network of observational locations for measuring water quality in water reservoirs have been widely proposed, but they had some limitations to be applied to river areas, which lie in awkward clustering and finding representati

When the number of items of same type of industrial property is quite large, calculating depreciation for a group of such items may be more efficient than depreciating each item separately. Several different depreciation systems may be used for group depr

Ship handling simulator is a virtual ship navigating system with three dimensional screen system and simulation programs. FTS simulation can produce theoretically infinite experiment tests without time constraint, but which results in collecting determins

우리나라의 보편적 장치산업의 각 생산공정 공정 세팅(setting)치는 Adjacent Point를 지향한다. 바로 이 점이 운전 세팅치를 자주 변경하게 하는 것이다. 다시 말해 근접한 점에 맞추려고 하는 행동이 군내 변동은 작게 만들지만, 군간 변동은 더욱 크게 만드는 현상을 초래하고 있다. 이 경우 데이터의 자기상관에도 나쁜 영향을 미친다고 할 수 있다. 또한 빈번히 사고성 Control-out도 나타나게 되며, 장기적으로 보았을 때 설비의 내구성에도 영향을 마치게 된다. 이는 4M 표준화의 필요성과 중요성이 강조되는 이유이기도 하다. 최근에는 다행스럽게 현장 작업자의 4M 표준화(세팅치 포함) 변화의 권한과 행위는 지양되고 담당 Engineer에게 절대적인 책임과 권한이 주어져 4M 표준화 및 공정의 Control-in 개념도 자연스럽게 재고되고 있는 상황이다. ARIMA를 이용한 통계적 모형을 만들어 분석하는 것이 최고의 결과를 도출하기 위한 방법이라고 할 수 있으나, 이 방법은 모형을 만들고 분석하는 과정이 너무 어렵고 복잡하여 많은 데이터를 다루는 공정에서 사용하기에 무리가 있는 것이 사실이다. 다소 간편하다 할 수 있는 AR모형을 이용하여 관리 상한과 하한 폭을 넓혀서 분석하는 방법도 있지만, 이 또한 마찬가지로 과정이 어렵고 복잡하다. 실제공정에서는 자기상관이 소멸되는 시간간격 데이터를 이용한 Shewhart 관리도로도 공정 관리 상태를 판독하고 관리하는데 별 무리가 없다고 인지되는 상황이다. 그러나 Adjacent Point를 지향한 운전 습관은 그대로 남아 이상원인 검출에 어려움이 생길 수 있다. 본 연구에서는 기존의 Shewhart 관리도보다 가중치에 따라 작은 변화에 보다 더 민감하게 반응하는 EWMA 관리도를 바탕으로 장치 공정에서의 모니터링 효율성 재고를 위한 모델을 제안하고자 한다.

Engineering valuation is a specialized discipline requiring expert knowledge and judgment, which scientifically estimates the economic value of industrial properties. By industrial properties, we mean engineering structures such as mines, factories, build

Recent competitive and technological changes during the past decade have accelerated the need for better capital recovery methods. Competition and technology have together shortened the expected lives of property which could not have been forecasted sever

Depreciation accounting has as its main objective, the recovery of the original cost of plant investment less net salvage, over the estimated useful life of that plant. Accuracy of the whole life technique in meeting this objective depends entirely on the

시계열데이터는 ARMA 분석에 적합지 않은 요소를 내재하고 있는 경우가 있다. 특히 선형성과 주기성을 가진 요소가 확률적인 분포와 자주 혼재 되어 있다. 이 논문에서는 이런 선형적 주기적 요소를 찾아내고 분석하는 방법을 제시한다. 특히 주기적 요소는 여러 주기가 층층이 겹쳐져서 나타난다， 주기 간에 는 서로 일정 정수비율을 유지하며 ， 한 주기 안에 다른 주기가 내 포되어 있는 경우(nested periods)가 많다. 시간규모(time-scale) 개

Technological innovation depends on the quality of workers, whose ability is the key component to raise business competitiveness. Our study evaluates how satisfactory is the training of workers at small and medium sized firms , and suggest how to improve

In a technological driven environment, a depreciation estimate which is based on traditional like analysis results in a decelerated rate of capital recovery This time pattern of technological growths models needs to be incorporated into life analysis fram

The most generalized form of the triadic operation policy for an M/G/1 queueing model is developed It consists of three simple N, T and D operating policies and has a peculiar structure possessing concepts of dyadic policies Using the concept of the pseud

개발도상국에 있어서 온라인 구매와 같은 B2C 전자상거래의 확산은 선진국에 비해 느리게 이루어지고 있다. 본 연구에서는 전자상거래에 대한 개발도상국의 정보기술 수용에 영향을 미치는 요인들을 실증적으로 분석하기 위하여, TAM 기반의 연구모형을 제시하고 그 가설들을 표본 데이터를 사용하여 검증하였다. 연구 결과, 명성이나 경험과 같은 선행 요인들은 선진국의 경우와 다른 양태로 기술 수용에 영향을 미친다는 점을 알 수 있었다. 이러한 연구 결과는 개발도상국

This paper introduces a case study for efficient generation of production schedules in a tube manufacturing system. The considered scheduling problem consists of two sub problems : lot sizing for a job and job sequencing. Since these problems require simu