• 한국군사과학기술학회지
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• 제9권4호
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• pp.5-14
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• 2006

The correct and opportune decision of reengaging the intercepted target is required in order to enhance the engagement performance of the surface to air missile systems that has the ability to defense or attack against various targets at the same time. The engagement efficiency and success of these systems will be largely enhanced by assigning quickly its system resources to the intercepted target and minimizing the waste of system resources for the target which is not able to attack any more. The kill-assessment algorithm has to be able to evaluate automatically whether various targets intercepted by missiles are killed or not on the basis of the reasonable confidence level. The definition of kill assessment is discussed and the kill assessment algorithm is designed reliably by using Kalman filter and a probability theory. Finally its performance is evaluated and analyzed by the Monte Carlo simulation.

• 농촌계획
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• 제10권2호
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• pp.43-49
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• 2004

According to the growing concerns of the public with efficiency and effects of regional policies, their assessment works have become an important issue. Up to now, several studies have been carried out on economic effects of policies using conventional cost/benefit analysis, while there have been few studies on assessment of amenity oriented policies. From the above consideration, this study tried to develop An Annual Expenditure Assessment Model (AEAM) for amenity-oriented policy-making in rural area. As a pre-work for model development, the hierarchical indices system for rural development and the classification system of expenditure were designed. Being based on high significant relationship between rural amenities and local government expenditure, a linear optimization model for maximization of regional amenity was constructed. Through a case study of Sunchang-gun, Chonbuk-province, the model applicability was ascertained.

• 항공우주시스템공학회지
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• 제7권2호
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• pp.29-34
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• 2013

Safety requirements for aircraft and system functions include minimum performance constraints for both availability and integrity of the function. These safety requirements should be determined by conducting a safety assessment. The depths and contents of aircraft system safety assessment vary depending on factors such as the complexity of the system, how critical the system is to flight safety, what volume of experience is available on the type of system and the novelty and complexity of the technologies being used. Requirements that are defined to prevent failure conditions or to provide safety related functions should be uniquely identified and traceable through the levels of development. This will ensure visibility of the safety requirements at the software and electronic hardware design level. This paper has prepared to study on promoting the efficiency of establishing hierarchical safety requirements from aircraft level function to item level through system safety processes.

• 한국안전학회지
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• 제29권4호
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• pp.184-190
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• 2014

Decommissioning process of nuclear facilities consist of a sequence of problem solving activities, because there may exist not only working environments contaminated by radiological exposure but also industrial hazards such as fire, explosions, toxic materials, and electrical and physical hazards. Therefore, not a few countries in the world have been trying to develop appropriate counter techniques in order to guarantee safety and efficiency of the process. In spite of that, there still exists neither domestic nor international standard. Unfortunately, however, there are few workers who experienced decommissioning operations a lot in the past. As a solution, it is quite necessary to utilize experts' opinions for risk assessment in decommissioning process. As for an individual hazard factor, risk assessment techniques are getting known to industrial workers with advance of safety technology, but the way how to integrate those results is not yet. This paper aimed to find out an appropriate technique to integrate individual risk assessment results from the viewpoint of experts. Thus, on one hand the whole risk assessment activity for decommissioning operations was modeled as a sequence of individual risk assessment steps which can be classified into two activities, decontamination and dismantling, and on the other, a risk assessment structure was introduced. The whole model was inferred with Fuzzy theory and techniques, and a numerical example was appended for comprehension.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권8호
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• pp.4241-4254
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• 2019

The efficiency and accuracy of handwriting measurement could be improved by adopting digital image processing. This study developed a computer-based Korean Handwriting Assessment tool. Second graders participated in this study by performing writing tasks of consonants, vowels, words, and sentences. We extracted boundary parameters for each letter using digital image processing and calculated the variables of size, size coefficient of variation (CV), misalignment, inter-letter space, inter-word space, and ratio of inter-letter space to inter-word space. Children were also administered traditional handwriting and visuomotor tests. Digital variables from image processing were correlated with these previous tests. Using these correlations, we established a three-point scoring system that computed test scores for each variable. We analyzed inter-rater reliability between the computer rater and human rater and test-retest reliability between the first and second performances. The validity was examined by analyzing the relationship between the Korean Handwriting Assessment and previous handwriting and visuomotor tests. We suggested the Korean Handwriting Assessment to measure size, size consistency, misalignment, inter-letter space, inter-word space, and space ratio using digital image processing. This Korean Handwriting Assessment tool proved to have reliability and validity. It is expected to be useful for assessing children's handwriting.

• 한국식품위생안전성학회지
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• 제23권1호
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• pp.80-84
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• 2008

유해물질의 식품기준은 위해성이 인정될 때 정하는 것을 원칙으로 한다. 위해평가의 절차에 거쳐 정량적 수치로 인정되는 위해성은 정부의 관리방향을 설정하는데 중요한 정보를 제공한다. 대표성 있는 모니터링자료가 확보되어야 정확한 위해평가를 수행할 수 있으므로 만성적 건강영향을 나타내는 유해물질의 경우 장기적 모니터링결과를 확보하는 것이 필요하다. 과거에는 대다수 인구집단의 안전에 초점을 두었으나, 최근에는 고섭취에 의한 유해물질 고노출그룹, 동일노출 수준에서도 유해영향을 크게 나타내는 민감그룹, 노약자, 임산부 등의 안전까지도 검토 후 소수그룹까지 안전할 수 있는 기준을 설정하는 추세이다. 유해물질 기준검토를 위하여 최신의 독성정보, 통계정보, 분석기술정보, 낮출 수 있는 한 낮출 수 있는 ALARA(as low as reasonably achievable)정보들이 필요하다.

• 한국농공학회논문집
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• 제63권4호
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• pp.55-64
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• 2021

The expansion of upland crop cultivation in rice paddy fields is recommended by the Korean government to solve the problem of falling rice price and reduction of rice farmer's income due to oversupply of rice. However, water use efficiency is significantly influenced by the land use change from paddy field to upland. Therefore, this study aimed to evaluate the water budget of soybean grown in using APEX (Agricultural Policy and Environmental eXtender) model. The amount of runoff was measured in a test bed located in Iksan, Jeollabu-do and used to calibrate and validate the simulated runoff by APEX model. From 2019 to 2020, the water budget of soybean grown in uplands were estimated and compared with the one grown in paddy fields. The calibration result of AP EX model for runoff showed that R² (Coefficient of determination) and NSE (Nash-Sutcliffe efficiency) were 0.90 and 0.89, respectively. In addition, the validated results of R² and NSE were 0.81 and 0.62, respectively. The comparative study of each component in water budget showed that the amounts of evapotranspiration and percolation estimated by APEX model were 549.1 mm and 375.8mm, respectively. The direct runoff amount from upland was 390.1 mm, which was less than that from paddy fields. The average amount of irrigation water was 28.7 mm, which was very small compared to the one from paddy fields.

• 한국수자원학회논문집
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• 제46권6호
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• pp.629-642
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• 2013

본 연구에서는 낙동강 본류의 강정고령보에 설치된 인공하도식 어도의 효율성을 2차원 물리서식처 모형인 River2D를 이용하여 평가해 보았다. 강정고령보 상하류단의 실측 수위를 이용하여 모형을 보정 및 검정하였다. 모의조건은 2012년 풍수량, 평수량, 저수량을 기준으로 어도 입구 및 어도 내부의 흐름장을 분석하였다. 특히 본 연구의 목표종인 피라미가 산란기인 봄철에 주로 이동을 하므로, 저수기를 기준으로 어도가 기능을 잘 유지하는지 살펴보았다. 분석결과, 풍수 및 평수기에는 본류 수위가 높아 어도로의 피라미 유입 효율성이 떨어져 보였다. 반면 저수기에는 본류의 낮은 수위로 인해 어도 입구에 상대적으로 적절한 유속이 발생하여 유입효율과 이동효율이 높아질 것으로 평가되었다. 어도 내 흐름은 어류가 소상하기에 무리가 없는 유속장이 발생하는 것으로 파악되었다.

• 한국추진공학회지
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• 제11권6호
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• pp.26-34
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• 2007

항공기술의 발전 추세에 따라서 고성능 엔진을 개발하고자 하는 노력이 꾸준히 진행되고 있다. 항공기 엔진의 성능을 향상시키기 위하여 고효율 구성품, 고강도 재료, 정밀제어기술을 복합화하여 적용하는 경우, 개별 부품의 신뢰성과 엔진의 안전성이 저하되는 경향을 보이게 된다. 본 논문에서는 항공기 엔진의 안전성을 입증하는데 필요한 요구조건과 평가기법을 고찰하고, 고효율 순항비행을 위하여 대형 터보팬엔진에 사용되는 터빈케이스 냉각시스템에 대한 안전성 평가를 수행하였다.

• Structural Engineering and Mechanics
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• 제16권1호
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• pp.17-34
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• 2003

This paper presents a damage assessment procedure applied to periodic spring mass systems using an eigenvalue sensitivity-based method. The damage is directly related to the stiffness reduction of the damage element. The natural frequencies of periodic structures with one single disorder are found by adopting the transfer matrix approach, consequently, the first order approximation of the natural frequencies with respect to the disordered stiffness in different elements is used to form the sensitivity matrix. The analysis shows that the sensitivity of natural frequencies to damage in different locations depends only on the mode number and the location of damage. The stiffness changes due to damage can be identified by solving a set of underdetermined equations based on the sensitivity matrix. The issues associated with many possible damage locations in large structural systems are addressed, and a means of improving the computational efficiency of damage detection while maintaining the accuracy for large periodic structures with limited available measured natural frequencies, is also introduced in this paper. The incomplete measurements and the effect of random error in terms of measurement noise in the natural frequencies are considered. Numerical results of a periodic spring-mass system of 20 degrees of freedom illustrate that the proposed method is simple and robust in locating single or multiple damages in a large periodic structure with a high computational efficiency.