• 한국정보통신학회논문지
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• 제16권3호
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• pp.470-475
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• 2012

EPCglobal Class-1 Gen-2 RFID 시스템의 Q-알고리즘에서는 슬롯-카운트 매개변수인 $Q_{fp}$ 값에 대한 초기 값이 정의되어 있지 않고, 슬롯-카운트의 크기를 증감시키기 위한 매개변수인 가중치 C의 값이 정해져 있지 않다. 따라서 태그의 수가 적은 상태에서 초기 $Q_{fp}$ 값을 크게 하면 빈 슬롯이 많이 발생하고, 태그의 수가 많은 상태에서 초기 $Q_{fp}$값을 적게 하면 충돌이 많이 발생한다. 또한 적절하지 못한 가중치를 선택할 경우 빈 슬롯 또는 충돌 슬롯이 많이 발생할 수 있다. 이로 인하여 질의 라운드 동안 최적의 프레임 크기에 수렴하는 속도가 늦어지므로 성능이 저하되는 문제점이 있다. 본 논문에서는 태그 수를 추정하여 최적의 초기 $Q_{fp}$ 값을 할당하고 현재의 슬롯-카운트 크기에 따라 가중치를 결정하는 기법을 제안하고, 이에 대한 성능을 분석한다.

• 대한임상검사과학회지
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• 제38권1호
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• pp.1-8
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• 2006

The purposes of this study were to evaluate the changes in hematologic indices after plateletpheresis and to identify the preapheresis platelet count and clinical factors (age, gender, height, and weight) that showed some influence on the percentage of platelet decrement, yield and efficiency. Plateletpheresis was performed on 101 healthy donors in Bundang CHA general hospital. The data was analyzed using the SAS program with t-test, ANOVA test and Multiple regression. The mean percentage decrease after plateletpheresis was 2.0% in hemoglobin, 1.8% in hematocrit, and 29.7% in the platelet count, while a WBC count showed an increase of 2.6%. The mean percentage decrease of hemoglobin and hematocrit were 1.7% and 1.4%, in males and 3.6% and 3.7% in females, respectively. Particularly the percentage decrease of platelet count was significantly higher in females (40.0%) than in males (27.2%). The platelet decrementage and yield were significantly higher in females, but the efficiency did not differ significantly between males and females. The yield showed the lowest levels in subjects who were 40 years old or over but the platelet decrement and efficiency did not change according to age. The platelet decrement increased as height and weight increased. Also, the platelet decrement and yield increased as the initial platelet counts increased, but the efficiency did not. From multiple regression analysis, the platelet decrement was associated with gender, weight, and initial platelet count. The yield was related to the initial platelet count, but the efficiency was not related to gender, age, weight, height or initial platelet counts. This study has a limitation of the generality of the study results since this study was conducted only in a single university hospital. Further study would be necessary to find out a subpopulation that is sensitive to the hematologic change after plateletpheresis, and to determine the standard criteria for blood donation based on the subpopulation.

• 대한한의학회지
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• 제41권3호
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• pp.22-31
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• 2020

Objectives: The purpose of this study was to investigate the association between sleep status and weight loss among adult women with obesity administered with Gamitaeeumjowee-tang. Methods: We retrospectively reviewed the medical records of 137 patients who were were administered with Gamitaeeumjowee-tang for 3 months for the purpose of weight loss. We divided subjects according to sleep duration and sleep quality. We conducted an independent t-test to compare the differences of weight loss between two groups. Also, a regression analysis was applied to determine which factors affected weight loss. Results: There was no significant difference in weight loss between patients who sleep more than 7 hours regularly and patients who sleep less than 7 hours. There was no significant difference between good sleepers and poor sleepers. Initial body mass index and the number of visits to the clinic were the significant factors in weight loss in 2-4 weeks. Initial weight loss was the significant factor in weight loss in 10-12 weeks. There was no significant correlation of sleep duration and sleep quality in weight loss in 2-4 weeks and 10-12 weeks. Conclusions: This study suggests that weight loss may not be affected by sleep status during Gamitaeeumjowee-tang intervention. ostachys japonicus, THP-1, acute myeloid leukemia, apoptosis, autophagy.

• 한국항행학회논문지
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• 제23권2호
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• pp.214-220
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• 2019

산업현장에서의 안전사고 빈도가 높은 지게차 전복의 주요 원인인 과적을 방지하기 위해 개발된 앵커(anchor) 볼트 형태의 strain 게이지 센서의 초기 값 오차를 보정하는 방법을 제안하였다. Strain 게이지 센서의 초기 값 오차는 앵커 볼트의 물리적이고 기계적 오차와 환경적 문제에기인하는 것을 확인하였다. 이러한 원인들을 제조 공정에서 제거하는 것은 본 연구의 범위를 벗어나는 것이기 때문에 제반 원인들을 고려한 보정 값을 찾고, 이 보정 값으로 strain 게이지 센서부를 구성하는 ADC 모듈의 초기 값을 보정하는 방법을 적용하였다. 보정 값 도출을 위하여 선형 보간법을 채택하였다. 도출한 보정 값을 4개의 strain 게이지 센서에 적용하여 시험한 결과 4개의 센서 모두 실제 중량 값과의 차이가 5% 이내가 되는 것을 확인하였다. 아울러 초기 값 보정 전에는 센서들의 ADC 값과 적재 중량 실제 값의 상관성이 없었던 점도 동시에 해결할 수 있었다.

• International Journal of CAD/CAM
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• 제5권1호
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• pp.29-38
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• 2005

A non-uniform 3-point ternary interpolatory subdivision scheme with variable subdivision weights is introduced. Its support is computed. The $C^0$ and $C^1$ convergence analysis are presented. To elevate its controllability, a modified edition is proposed. For every initial control point on the initial control polygon a shape weight is introduced. These weights can be used to control the shape of the corresponding subdivision curve easily and purposefully. The role of the initial shape weight is analyzed theoretically. The application of the presented schemes in designing smooth interpolatory curves and surfaces is discussed. In contrast to most conventional interpolatory subdivision scheme, the presented subdivision schemes have better locality. They can be used to generate $C^0$ or $C^1$ interpolatory subdivision curves or surfaces and control their shapes wholly or locally.

• 한국환경과학회지
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• 제11권4호
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• pp.361-366
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• 2002

Several effects on Pb$^{2+}$ removal by crab shell from aqueous solution were investigated. As the increase of initial Pb$^{2+}$ concentration and decrease of initial crab shell concentration, the time required to reach an equilibrium state and the residual Pb$^{2+}$ concentration increased. In our experimental ranges, the optimum initial Pb$^{2+}$ concentration and crab shell concentration were below 103 mg/$\ell$ and over 0.5 mg/$\ell$, respectively. Also, in order to investigate the mechanism of Pb$^{2+}$ removal by crab shell in aqueous solution, the crab shell was compared with chitosan and chitin on aspects of Pb$^{2+}$ removal capacity and Pb$^{2+}$ removal rate. The Pb$^{2+}$ removal by crab shell was greater than that by chitin and chitosan. The role of chitin was not so great in Pb$^{2+}$ removal by crab shell. The Pb$^{2+}$ removal by chitosan was not exactly correlated to the molecular weight of chitosan. weight of chitosan.

• 대한조선학회논문집
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• 제52권2호
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• pp.125-134
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• 2015

Spherical type LNG carrier has many advantages, but has a demerit it is more expensive than membrane type one. Therefore, when calculating the initial estimate of spherical type LNG carrier, high accuracy calculation of tank weight has to be carried out. In this study the simplified analysis method which is able to calculate stresses of all the tank zones is established and has special feature to deal with static and dynamic loading. In order to verify the established method, the design results obtained through the method in this study have been compared with those of existing ship obtained from finite element analysis. As a result, the usability of simplified analysis method has been confirmed.

• 한국학교보건학회지
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• 제12권1호
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• pp.27-44
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• 1999

Obesity in children is a major concern of public health. This study was performed to illuminate its effect on weight control program and the associated factors of obesity-related habits and obesity index in primary school obese children. Weight control program consisted of behavioral modification, nutrition education and exercise during 17 weeks. The sample consisted of treatment group(n=42) and control group(n=41). There was no statistical difference between the two groups in obesity index, socioeconomic status and grade. To assess the effects of weight control program, the subjects were given pre-test and post-test such as the measurement of anthropometric values and self-reporting questionnaire. This result of this study were as follows; 1. After weight control program was applied, there was a significant decrease in obesity index among the treatment group. Obesity-related habits score of the treatment group increased significantly, While there was not much difference between the pre-test and the post-test among the control group. But exercise habit didn't increase significantly in the both groups. 2. Correlation between obesity-related habits and obesity index were not evident. 3. After application of weight control program, the factors associated with change of eating habit were children's past experience of weight control, motivational change toward weight control program and friends' support for treatment group. The factors associated with change of exercise habit were post-test motivation score and friends' support. Motivational change toward weight control and pre-test self-efficacy of exercise behavior were counter-related to exercise habit. For change of other obesity-related habits, initial obesity index, motivational change, post-test self-efficacy score of exercise behavior and paternal educational status were closely associated. But post-test self-efficacy score of eating behavior was unrelated. 4. Only the factor of experience of weight control was associated with change of obesity index. 5. For the both groups, the factors associated with change of eating habits were post-test self-efficacy of eating behavior and family's support. The factors associated with change of exercise behavior were self-efficacy changes of exercise behavior and friends' support. The factors associated with change of other obesity-related habits were self-efficacy change of eating behavior. Initial obesity index was associated with change of obesity index. 6. The rate of dropouts from weight control program was 28.6% (12/42) in treatment group. Initial obesity index, other obesity-related habits except eating exercise habits, friend's support were associated with dropout. In conclusion, these results indicated that weight control program in primary school settings was effective. Direct exercise regimen and practice was demanded. In addition to the program itself, much of the success is dependent on the degree of motivation of the children involved and support provided by their parents and friends. Further study need to be performed under the condition that the weight control progrom is applied for a longer period.

• Structural Engineering and Mechanics
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• 제74권4호
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• pp.533-545
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• 2020

An optimal design method for a spoke double-layer cable-net structure (SDLC) is proposed in this study. Simplified calculation models of the SDLC are put forward to reveal the static responses under vertical loads and wind loads. Next, based on an energy principle, the relationship among the initial prestress level, cross-sectional areas of the components, rise height, sag height, overall displacement, and relative deformation is proposed. Moreover, a calculation model of the Foshan Center SDLC is built and optimized. Given the limited loading cases, material properties of the components, and variation ranges of the rise height and sag height, the self-weight and initial prestress level of the entire structure can be obtained. Because the self-weight of the cables decreases with increasing of the rise height and sag height, while the self-weight of the inner strut increases, the total weight of the entire structure successively exhibits a sharp reduction, a gradual decrease, a slow increase, and a sharp increase during the optimization process. For the simplified model, the optimal design corresponds to the combination of rise height and sag height that results in an appropriate prestress level of the entire structure with the minimum total weight.

• 제어로봇시스템학회논문지
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• 제15권4호
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• pp.451-455
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• 2009

This paper provides a comparison of global path planning method in single string by using pulled and pushed SOFM (Self-Organizing Feature Map) which is a method among a number of neural network. The self-organizing feature map uses a randomized small valued initial-weight-vectors, selects the neuron whose weight vector best matches input as the winning neuron, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. On the other hand, the modified SOFM method in this research uses a predetermined initial weight vectors of the one dimensional string, gives the systematic input vector whose position best matches obstacles, and trains the weight vectors such that neurons within the activity bubble are move toward or reverse the input vector, by rising a pulled- or a pushed-SOFM. According to simulation results one can conclude that the modified neural networks in single string are useful tool for the global path planning problem of a mobile robot. In comparison of the number of iteration for converging to the solution the pushed-SOFM is more useful than the pulled-SOFM in global path planning for mobile robot.