• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.193-194
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• 2017

In this research, the density value of the turbid solution is measured by using the principle of inexpensive but easy Hydrometer method for cement delivered to the actual raw concrete plant, By analyzing the correlation of powder aid, we will try to present a scheme that can be utilized as a method of acquisition acquisition inspection. As a result of the analysis, it was found that there was a large difference between the measured powders assisted with cement powder on the report, and the correlation with the actually measured powder aid Hydrometer density value was good. Therefore, using the method of Fig. 3, it was possible to know that the degree of powder quality of cement delivered to the raw concrete factory can be evaluated quickly and utilized at the time of argument inspection.

• Journal of Biosystems Engineering
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• 제14권3호
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• pp.207-214
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• 1989

In this study, impact force and angular displacement of the pendulum were measured by the load cell and potentiometer. Mechanical behavior of rough rice under impact loading was able to analyze precisely and efficiently, because measured data were accumulated and handled by the automatic data acquisition system making use of microcomputer system. Impact force and angular displacement were measured with a resolutiln of 1/1500 seconds in time. Mechanical behavior such as force and energy at rupture point of Japonica type and Indica type rough rice were measured with this system. After impact loading, the damage of rough rice was examined with the microphotograph and an allowable impact force was measured. The results obtained in this study are summarized as follows. 1. Machanical behavior of rough rice under impact loading was analyzed precisely and efficiently because measured data were accumulated and handled by this data acquisition system. 2. Rupture force and rupture energy of rough rice were appeared to be the lowest value in the range of 16 to 18 % moisture content, and rupture force and rupture energy of Japonica type were higher than those of Indica type in each level of moisture content. 3. From the result of the damage examined after the impact loading, allowable impact force was the lowest in the range of 16 to 18 % moisture content, and the value of the allowable impact force of Japonica type was higher than that of Indica type in each level of moisture content.

• 품질경영학회지
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• 제46권4호
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• pp.821-842
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• 2018

Purpose: To derive key requirements and key technologies for weapon system acquisition business by using Qualify Function Deployment (QFD), and to reduce business cost by setting the target performance and key expense of weapon system. Methods: We propose a QFD methodology that can induce rational decision-making by translating analyst's subjective opinions into quantitative values when analyzing requirements at the initial stage of weapon system development project. Based on QFD methodology, QFD application model combining house of quality, value engineering, and analogy cost estimating technique is presented. Results: It was possible to analyze the specific requirements necessary for the development of the weapon system, to solve the communication problem of the participants, to set clear development direction and target. Conclusion: By applying the QFD application model at the early stage of the weapon system acquisition project, it is possible to reduce the business cost by establishing clear development direction and goal through the procedural analysis process.

• 한국식품과학회지
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• 제24권6호
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• pp.524-527
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• 1992

식품가공 공정의 중요변수인 온도, 무게, 상대습도를 측정하기 위하여 16bit 마이크로컴퓨터와 PCL-711S 접속 board로 컴퓨터 시스템을 구성하였다. 자료수집, 공정제어 및 자료분석용 소프트웨어인 PC-LabDAS를 활용하여 센서, 변환기 및 컴퓨터시스템을 작동시켜서 건조 및 저장시 공정변수를 측정하였다. 온도, 무게 및 습도의 측정값과 변환기의 출력값 사이에는 $r^2$가 0.99이상으로 고도의 상관관계를 보였으며 센서의 감응속도도 순간적으로 변하는 미세한 값도 측정할 수 있을 만큼 충분히 빨랐다.

• Journal of Magnetics
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• 제21권1호
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• pp.148-152
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• 2016

The main goal was to evaluate effectiveness of a modified TSE sequence compared with DIR (double inversion recovery) sequence in acquisition of fast flow brain vessel images using signal void effect. 32 healthy volunteers (10 men and 22 women; mean age of 31 years; ranging between 28-43 years) who underwent black blood DIR sequence (group A) and the modified TSE sequence (group B) were enrolled in our study. Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR) of the internal carotid arteries' lumen were compared in T1 and T2 weighted images for both group A and B. The images obtained from group B showed lower SNR values in internal carotid artery than the group A in both of the T1 and T2 weighted images (11.49% and 13.66% respectively). While the CNR values were higher in the group B than the group A in both of the T1 and T2 weighted images (8.69% and 7.55 % respectively). The qualitative score of all categories were not significantly different between the two groups. Furthermore approximately 49% of the total scan time was reduced from group B. Our study is to shorten the scanning time and minimize the inconveniences of the patients in acquisition of the black blood images of brain by using the signal void effect in the modified TSE technique while keeping the diagnostic value of the test.

• 기록학연구
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• 제42호
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• pp.185-211
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• 2014

이 글의 목적은 사회의 대사건이나 주요 공공 정책에 관한 기록화를 위해 작동되는 보존기록 시스템에 관한 논의이다. 필자는 세 가지를 제안하였다. 첫째는 기록이 만들어지는 같은 시대에 보존기록을 선별하는 기록화 전략의 개발이다. 여기에는 기록에 포함된 모습이 중요하며 여기에 가급적 넓은 사회적 맥락이 반영되어야 한다는 것으로, 필자는 이는 보존기록의 가치에 관한 사고의 전환에서 비롯된 것으로 보았다. 둘째는 그러한 전략에 해당하는 보존기록을 획득하기 위한 도구의 개발이다. 기록화 전략은 전략에 맞는 기록을 획득하는 별도의 방법을 필요로 한다는 것이 필자의 주장이다. 셋째는 이러한 기록화 전략과 기록 획득수단의 지속가능성이다. 이와 관련하여 필자는 현행 한국의 국가 아카이브 체제의 문제에 관해 논의하였다.

• Nuclear Engineering and Technology
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• 제55권1호
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• pp.222-228
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• 2023

This study aimed to analyze the applicability of the improved median filter in positron emission tomography (PET)/magnetic resonance (MR) fusion images based on parallel imaging using generalized autocalibrating partially parallel acquisition (GRAPPA). In this study, a PET/MR fusion imaging system based on a 3.0T magnetic field and ¹⁸F radioisotope were used. An improved median filter that can set a mask of the median value more efficiently than before was modeled and applied to the acquired image. As quantitative evaluation parameters of the noise level, the contrast to noise ratio (CNR) and coefficient of variation (COV) were calculated. Additionally, no-reference-based evaluation parameters were used to analyze the overall image quality. We confirmed that the CNR and COV values of the PET/MR fusion images to which the improved median filter was applied improved by approximately 3.32 and 2.19 times on average, respectively, compared to the noisy image. In addition, the no-reference-based evaluation results showed a similar trend for the noise-level results. In conclusion, we demonstrated that it can be supplemented by using an improved median filter, which suggests the problem of image quality degradation of PET/MR fusion images that shortens scan time using GRAPPA.

• 한국환경복원기술학회지
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• 제17권4호
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• pp.29-41
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• 2014

The Korean government has purchased land properties alongside any significant water bodies before setting up the buffers to secure water qualities. Since the annual budgets are limited, however, there has always been the issue of which land parcels ought to be given the priority. Therefore, this study aims to develop efficient mechanism for land acquisition priorities in stream corridors that would ultimately be vegetated for riparian buffer zones. The criteria of land acquisition priority were driven through literary review along with experts' advice. The relative weights of their value and priorities for each criterion were computed using the Analytical Hierarchy Process(AHP) method. Major findings of the study are as follows: 1. The decision-making structural model for land acquisition priority focuses mainly on the reduction of non-point source pollutants(NSPs). This fact is highly associated with natural and physical conditions and land use types of surrounding areas. The criteria were classified into two categories-NSPs runoff areas and potential NSPs runoff areas. 2. Land acquisition priority weights derived for NSPs runoff areas and potential NSPs runoff areas were 0.862 and 0.138, respectively. This implicates that much higher priority should be given to the land parcels with NSPs runoff areas. 3. Weights and priorities of sub-criteria suggested from this study include: proximity to the streams(0.460), land cover(0.189), soil permeability(0.117), topographical slope(0.096), proximity to the roads(0.058), land-use types(0.036), visibility to the streams(0.032), and the land price(0.012). This order of importance suggests, as one can expect, that it is better to purchase land parcels that are adjacent to the streams. 4. A standard scoring system including the criteria and weights for land acquisition priority was developed which would likely to allow expedited decision making and easy quantification for priority evaluation due to the utilization of measurable spatial data. Further studies focusing on both point and non-point pollutants and GIS-based spatial analysis and mapping of land acquisition priority are needed.

• 한국산학기술학회논문지
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• 제19권10호
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• pp.394-400
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• 2018

최근 방위력 증강을 위해 대규모 무기체계 획득사업을 추진하면서 큰 폭의 국방예산 증액이 예상되고 있으며, 이러한 무기체계 획득에 필요한 재원 확보를 위해 국방예산의 효율화 필요성이 제기되고 있다. 또한 국방획득사업의 예산 절감뿐만 아니라 해외 수출가능성, 고용창출 효과 등 국내 경제에 영향을 미치는 경제성 요소에 대한 관심이 높아지고 있다. 이러한 요구에 부응하기 위해 국방획득사업 추진 시 비용편익 분석, 경제적 파급효과 등을 고려한 경제성 분석을 검토하고 있으나, 아직까지 국방획득사업의 특성을 고려한 경제성 분석 방법론에 대한 연구는 초기 단계인 실정이다. 본 연구에서는 국방획득사업의 경제성 분석을 위한 방법론을 제안하고, 국지도발에 대비해서 추진하고 있는 ${\bigcirc}{\bigcirc}$유도무기에 대한 경제성 분석 실증연구를 수행하였다. 본 연구에서 제안한 경제성 분석 방법은 그동안 다수의 무기체계 획득사업에서 수행해왔던 비용 대 효과분석을 보다 일반적인 비용편익 분석방법과 연계하여 그 분석 결과를 제공함으로써, 향후 보다 포괄적이고 신뢰성 있는 무기체계 획득사업 경제성 분석 확립에 본 연구가 개념적 방법론적으로 다소간 기여할 수 있을 것으로 판단된다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.146-149
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• 2005

Thesedays, the reduction of hand-transmitted vibration of hand-held power tools is important issue for operators' welfare, In the study, frequency response function is measured and vibration total value is evaluated for solving the principle and effect of the BOSCH's vibration-proof handle. This handle functions as a dynamic damper and has the effect, 22% vibration total value reduction under idling condition using a system that consists of a PC with data acquisition system and LabVIEW program. The program in the system makes it possible to evaluate vibration total value according to ISO 5349. This handle offers a good example for figuring out the physical contradiction between the work efficiency and operators' health.