• Journal of Biosystems Engineering
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• 제42권4호
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• pp.242-250
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• 2017

Purpose: This study was conducted to determine the appropriate operating conditions through a factorial experiment for the secondary separating part of the self-propelled pepper harvester. Methods: An experimental setup that simulates the secondary separating part of the self-propelled pepper harvester was organized. Test samples were classified into three types according to the number of peppers on a stem, and 12 sets were prepared for each type. Among the operating conditions of the secondary separating part, the rotational speed of drum B (four levels), radial clearance between drums and cylindrical teeth (three levels), and speed ratio between the three drums (two levels) were set as the test factors, and tests were repeated three times for different levels of each factor. The appropriate operating conditions were determined by analyzing the separation ratio and damage ratio of the peppers collected through the secondary separating part. Results: The test factors changed the overall separation ratio and overall damage ratio in similar trends. In other words, the conditions that caused high overall separation ratios also exhibited high overall damage ratios. Owing to the high overall damage ratio in the condition with the highest overall separation ratio, the operating conditions should be selected considering both ratios. Conclusions: When the condition with more than 60% of overall separation ratio and less than 15% of overall damage ratio was considered as the appropriate operating condition, 70 rpm of the rotational speed of drum B, 5 mm of the radial clearance between drums and cylindrical teeth, and 7:3:5 for the speed ratio of the three drums A, B, and C should be applied for the secondary separating part used in this study. Supplementary studies will be required in the future to find optimal operating conditions through the actual field test under further divided test factors.

• 한국초등수학교육학회지
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• 제22권2호
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• pp.183-198
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• 2018

본 논문은 모으기와 가르기 활동에서 0의 처리에 대한 시사점을 찾기 위해 모으기와 가르기 활동을 이론적으로 고찰하고 7개국의 교과서와 5차 교육과정부터 2015 개정 교육과정에 따른 우리나라 수학 교과용 도서를 분석하였다. 모으기는 덧셈과 유사한 정의와 성질을 지니지만, 가르기는 정의하기 어려우며 뺄셈과 유사한 성질을 지닌다고 보기 어렵다. 연산의 의미상으로는 모으기와 가르기는 '부분-부분-전체(part-part-whole)' 상황으로 볼 수 있으나 덧셈과 뺄셈 상황의 일부분에 해당한다고 볼 수 있다. 외국 교과서를 분석한 결과, 싱가포르와 말레이시아 교과서에서는 0을 이미 학습한 후 0을 모으기와 가르기 활동에서 포함하나, 그 밖의 국가들은 0을 모으기와 가르기 활동에서 포함하지 않는 것으로 확인되었다. 우리나라 교과서에서는 0을 포함하지 않도록 일관되게 제시해 왔으나, 교사용 지도서에서는 0의 처리 여부에 대해 일관되지 않음을 확인할 수 있었다. 이에 따라, 학생 수준을 고려하여 모으기와 가르기에서 0을 포함하지 않고 도입하고자 할 때에는 이에 적절한 상황 맥락 제시가 필요하며, 교사용 지도서에서도 보다 일관성 있는 제시가 필요함을 제안하였다.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2003년도 10월 학술대회지
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• pp.25-28
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• 2003

The aim of this paper is to analyze the pathological voice by separating signal into periodic and aperiodic part. Separation was peformed recursively from the residual signal of voice signal. Based on initial estimation of aperiodic part of spectrum, aperiodic part is decided from the extrapolation method. Periodic part is decided by subtracting aperiodic part from the original spectrum. A parameter HNR is derived based on the separation. Parameter value statistics are compared with those of Jitter and Shimmer for normal, benign and malignant cases.

• 방사선산업학회지
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• 제9권3호
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• pp.153-159
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• 2015

Reliability of printed circuit board (PCB), which is based on high integrated circuit technology, is having been important because of development of electric and self-driving car. In order to answer these demand, automated X-ray inspection (AXI) is best solution for PCB non-destructive test. PCB is consist of plastic, copper, and, lead, which have low to high Z-number materials. By using dual energy X-ray imaging, these materials can be inspected accurately and efficiently. Dual energy X-ray imaging, that have the advantage of separating materials, however, need some solution such as energy separation method and enhancing efficiency because PCB has materials that has wide range of Z-number. In this work, we found out several things by analysis of X-ray energy spectrum. Separating between lead and combination of plastic and copper is only possible with energy range not dose. On the other hand, separating between plastic and copper is only with dose not energy range. Moreover the copper filter of high energy part of dual X-ray imaging and 50 kVp of low energy part of dual X-ray imaging is best for efficiency.

• 대한치과기공학회지
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• 제21권1호
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• pp.123-130
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• 1999

I attempted to suggest a better method to separate a refractory cast in order to solve the problems caused by bonding between refractory casts and ceramics in the firing-processing of all ceramic crowns as a part of dental prosthodontics. I emphasize the advantages and effectiveness of easy separation after firing by using the separating materials about the refractory cast dies. 1. We must not usse HF(55%) that is used as the chemical separating methods. 2. We decrease such methods as grinding, blasting, bur, and point 3. We can save time, costs and manual labors by using this methods. 4. This method regulates the expansion and constriction of heat because of the chemical reaction of the separating materials. 5. This method contribute to the breaking down without modification by minimizing the chemical and mechanical damages of the marginal and interior parts.

• 자원리싸이클링
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• 제6권2호
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• pp.12-21
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• 1997

Plastics waste constitutes approximately 23% by volume of the municipal solid waste(MSW) generated in the U.S. each year, and have slow rate of degradation in the environment. Therefore, there is a great deal of public pressure to recycle plastics, and more than 100 million people participate in the curbside recycling programs. Despite the high level of public interest, only 3.5% of the plastic are recycled, which is substantially lower than the recycle rates of other materials such as paper fibers, glass, and iron. Although a large part of the reason is due to the low price of virgin polymers, which in turn is due to the low price of oil, it is possible to make the plastics recycling as a profitable business by developing advanced technologies. In this communication, various methods of separating pplastics from metals and from each other are discussed.

• 한국전산유체공학회지
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• 제20권4호
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• pp.70-80
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• 2015

Construction waste is known to include a large part of coarse and fine aggregates, which can be recirculated in the industry. Separating those aggregates economically from the waste has been thus considered to be one of the most important issues in this field. In particular, paste mixed in the waste causes significant complain from the inhabitants living near the place where waste-processing equipments are built and operated. In this study, we investigate the operational principle of a newly developed paste separator by using theoretical (in this first part) and CFD (in the second part) analysis. The separator consists of a rotor which turned out to play a significant role in separating those pastes from the aggregates. Under suitable assumptions regarding the air flow velocity as well as the particle velocity, we show that particles can be stagnant at the outlet of the roto channel for a wide range of parameter values, which allow the particles to get enough time to settle down via the gravitation. We also demonstrate such phenomenon by using a simple numerical simulation.

• Journal of electromagnetic engineering and science
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• 제10권2호
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• pp.67-72
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• 2010

A new type of monopole antenna whit broadband characteristics is presented in this article. To reduce the size of the antenna, its upper part is folded. By separating the current flow, the resonance in the shorter part is in the higher band; and the longer part resonates in the lower band. This gives the broadband characteristics of the antenna. Slots on the corner using an oblique line improve the impedance matching and bandwidth. The measurement results show that the bandwidth operates from 0.848~0.992 GHz and 1.744~2.528 GHz, and the radiation patterns are in an omni-directional shape.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.187-190
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• 2005

There have been many studies to improve the performance of a database system focused on modifying data structure, data partitioning, and materializing strategy. The main contribution of this study is to propose a new alternative towards improving database performance by designing single table schema or processing queries virtually in main memory space. Material Requirement Planning(MRP) part explosion process has shown almost 2 times shorter under DB schema we suggested, and even more than 10 times shorter when separating and filtering policy of DB archiving process are assumed. Several experimental results are shown to illustrate the excellence of our solution.

• 대한간호학회지
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• 제29권3호
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• pp.494-506
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• 1999

The purpose of this study is to understand the structure of mothers of mentally handicapped daughters' lived experience, to apprehend the connectedness of the structure of the experience with concept of Parse's human becoming theory, and to provide a foundation for nursing research and education. Data collection was conducted from October 1995 to April 1996. Research participants were eight mothers of mentally handicapped daughters whose ages ranged from 12 to 18 attending special schools located in either Inchon or Seoul. The researcher had interviews with them over their lived experience conducted tape recorded, and made an analysis according to Parse's “human becoming research methodoloy.” The data were collected using the dialogical engagement process “I and You,” the participant researcher and the participant subject. The data were analyzed using the extraction-synthesis and heuristic interpretation. The structural integration is illustrated in the following : 1) Realizing the mother's role of mentally handicapped daughters and admitting situation. 2) Concealing a part of their relationship with others is interpreted as revealing-concealing. 3) Living a life kept moving between separating and connecting. 4) Their flight back voluntarily to improve the situation is interpreted as powering. The conceptual integration which emerged was the lived experience of mothers is powering through the revealing-concealing and connecting-separating of valuing.