• 한국건설관리학회논문집
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• 제12권5호
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• pp.12-22
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• 2011

건설 분야의 환경변화에 따라 다수의 건설 프로젝트에서 설계경제성 등 검토(설계VE)가 수행되고 있다. 그러나 그동안 수행되었던 VE 기능분석의 경우 체계적인 가능분석 방법론을 통한 아이디어 창출이라기보다는 VE 팀원의 개인적인 경험을 바탕으로 시설물 전체를 대상으로 실시하는 경향이 있다. 그 원인으로는 기존에 수행된 가능분석 자료의 재인용, 시설특성별 구체성이 결여된 포괄적인 기능분석과 추상적인 기능분석 등이 있다. 특히 가능에 요구되는 성능을 명확히 분석 및 정의하지 않음에 따라 건물 부위별로 요구되는 성능과 기능을 충족하지 못하는 경우가 많다. 따라서 본 연구에서는 기존 설계VE 워크숍 제안사례를 토대로 가능과 아이디어 연계현황 및 부위별 아이디어 분류현황 등을 분석하고 문제점 및 개선방향을 도출하였다. 이를 기반으로 VE 활동의 가장 핵심단계인 기능분석단계 중 기능정의/분류 가능정리 과정에서, 시설물 부위별 기능과 함께 요구성능을 반영하여, 기능과 아이디어의 논리적 연계성을 확보할 수 있는 성능기반 건물 부위별 기능분류체계를 개발하였다.

• 한국멀티미디어학회논문지
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• 제23권5호
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• pp.625-632
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• 2020

In the diagnosis of lung cancer, the tumor size is measured by the longest diameter of the tumor in the entire slice of the CT. In order to accurately estimate the size of the tumor, it is better to measure the volume, but there are some limitations in calculating the volume in the clinic. In this study, we propose an algorithm to segment lung cancer by applying a custom loss function that combines focal loss and dice loss to a U-Net model that shows high performance in segmentation problems in chest CT images. The combination of values of the various parameters in custom loss function was compared to the results of the model learned. The purposed loss function showed F1 score of 88.77%, precision of 87.31%, recall of 90.30% and average precision of 0.827 at α=0.25, γ=4, β=0.7. The performance of the proposed custom loss function showed good performance in lung cancer segmentation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2087-2092
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• 2005

Using disturbance observer (DOB) is effective in enhancing the performance of dynamic system in the presence of disturbances. Recently the definition of disturbance has been expanded to modeling uncertainty including parameter variation, internal disturbance. Various structures of DOB have been proposed to improve sensitivity of system for better disturbance rejection performance. However in the case of improvement of sensitivity function, it tends to bring poor transient response due to cross-coupling and phase lag. Furthermore it could be very sensitive to measurement noise due to increased peak of complementary sensitivity function. In this paper, a dual disturbance observer (Dual-DOB) is proposed to reduce the effect of such cross-coupling. It is possible for us to improve the sensitivity function with additional external DOB with hardly affecting complementary sensitivity function. Thus it is able to have robustness against measurement noise. Since we are able to design DOBs of internal and external loop independently, we could prevent transient response quality from degrading while improving the sensitivity function. The proposed Dual-DOB is applied to a commercial optical disk drive tracking servo system. The experimental result shows that the Dual-DOB is an effective method in rejecting the disturbance as well as improving the tracking performance.

• 정보처리학회논문지B
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• 제14B권5호
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• pp.377-382
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• 2007

본 논문에서는 방사 기저함수 네트워크의 파라미터를 전 영역에서 최적화하는 학습 알고리즘을 제안한다. 기존의 학습 알고리즘들은 지역 최적화만을 수행하기 때문에 성능의 한계가 있고 최종 결과가 초기 네트워크 파라미터 값에 크게 의존하는 단점이 있다. 본 논문에서 제안하는 하이브리드 모의 담금질 기법은 모의 담금질 기법의 전 영역 탐색 능력과 경사 기반 학습 알고리즘의 지역 최적화 능력을 조합하여 전 파라미터 영역에서 해를 찾을 수 있도록 한다. 제안하는 기법을 함수 근사화 문제에 적용하여 기존의 학습 알고리즘에 비해 더 좋은 학습 및 일반화 성능을 보이는 네트워크 파라미터를 찾을 수 있으며, 초기 파라미터 값의 영향을 크게 줄일 수 있음을 보인다.

• 한국치위생학회지
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• 제15권2호
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• pp.217-223
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• 2015

Objectives: The purpose of this study is to investigate cognitive function, performance of activities of daily living, and recognition on oral health with the cognitive function testto dementia or dementia-suspected patients in the outpatients. Methods: The subjects were 94 dementia or dementia-suspected patients visiting C University hospital for the dementia test. Study instruments included Korea Mini-Mental State Examination KMMS, The Bayer-Activities of Daily Living Scale; B-ADL, Seoul-Instrumental Activities of Daily Living; S-IADL, Global Deterioration Scale; GDS, Korean Dementia Screening Questionnaire; KDSQ, and underlying diseases. Results: Dementia or dementia-suspected patients were 42 by KMMSE test, 25 patients had impaired functioning of daily living by B-ADL test, 27 patients showed the presence of depression by GDS test, and 45 patients showed impaired functioning of daily living. There was a statistically significant difference in the subjective recognition on oral health conditions. There was a statistically significant difference in the subjective recognition on oral health conditions by ADL. There was a positive correlation between the cognitive function and ADL performance. Higher cognitive function is proportional to ADL performance. Conclusions: The cognitive function was closely associated with ADL and subjective oral health conditions.

• 대한물리치료과학회지
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• 제7권1호
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• pp.333-352
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• 2000

The objective of this study was to identify the effects of the cognitive performance of stroke patients on their motor function recovery after comprehensive rehabilitation management. The subjects of this study were 41 stroke in-patients of the Rehabilitation Hospital, College of Medicine, Yonsei University, hospitalized during the period from September 1, 1997 to May 5, 1998. The cognitive performance was measured using a Mini-Mental State Examination(MMSE) and the motor function recovery using Motor Assessment Scale(MAS). The data were analyzed by the paired t-test, independent t-test, a one way ANOVA, and Pearson's correlation coefficiency. The findings were as follows: 1. There was a significant difference found in the motor function recovery level after the comprehensive rehabilitation management. 2. There was no significant difference found in relation to sex, age, cause of stroke, laterality of paralysis and the level of spasticity. However, there was a big difference between pre- and post-treatment regarding the treatment period. 3. In line with the cognitive performance level, there was a significant difference found in the motor function recovery level after the comprehensive rehabilitation management. 4. The correlation between the elements of the cognitive performance and the motor recovery was found to be high in orientation, attention, calculation, and language. Those elements were expected to give larger effects on motor recovery after the comprehensive rehabilitation management. Based on this study, the cognitive performance level was found to play an important role in bringing effects on motor recovery after the comprehensive rehabilitation management of stroke patients. And the evaluation on the motor recovery based on quality would be also expected to be examined, as well as the cognitive performance level test accompanied by Intelligence Quality(IQ) test.

• 운동영양학회지
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• 제25권1호
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• pp.42-55
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• 2021

[Purpose] This study investigated the effects of marine phytoplankton supplementation (Oceanix®, Tetraselmis chuii) on 1) maximal isometric strength and immune function in healthy humans following a oneweek high-intensity resistance-training program and 2) the proinflammatory cytokine response to exercise in a rat model. [Methods] In the human trial, 22 healthy male and female participants were randomly divided into marine phytoplankton and placebo groups. Following baseline testing, participants underwent a 14-day supplement loading phase before completing five consecutive days of intense resistance training. In the rat model, rats were randomly divided into four groups (n=7 per condition): (i) control, (ii) exercise, (iii) exercise + marine phytoplankton (2.55 mg/kg/day), or (iv) exercise + marine phytoplankton (5.1 mg/kg/day). Rats in the exercising groups performed treadmill exercise 5 days per week for 6 weeks. [Results] In the human model, marine phytoplankton prevented significant declines in the isometric peak rate of force development compared to placebo. Additionally, salivary immunoglobulin A concentration was significantly lower following the resistance training protocol in the placebo group but not in the marine phytoplankton group. Marine phytoplankton in exercising rats decreased intramuscular levels and serum concentrations of tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1β) and intramuscular concentrations of malondialdehyde. [Conclusion] Marine phytoplankton prevented decrements in indices of functional exercise recovery and immune function. Mechanistically, these outcomes could be prompted by modulating the oxidative stress and proinflammatory cytokine response to exercise.

• 수면정신생리
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• 제10권2호
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• pp.88-92
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• 2003

Sleep-disordered breathing (SDB), including snoring, sleep apnea and upper airway resistance syndrome are common problems in children. The pathophysiological mechanism of SDB in children is unclear but may include hypoxemia and changes in sleep architecture. Children with SDB show reduced neurocognitive function, and memory and attentional capacity. Furthermore, these children show increased problematic behaviour and reduced school performance. Whether early recognition and treatment of SDB in children may improve neurocognitive function and school performance remains to be fully evaluated in the future.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.123-128
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• 1992

This paper presents an autotuning algorithm of scaling factor in order to improve system performance. We define the scaling factor of fuzzy controller as a function of error and error change. This function is tuned by the output of performance evaluation level utilizing the error of overshoot and rising time. Simulation results show that the proposed algorithm has good tuning performance for a system with parameter change.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1983년도 추계학술발표회논문집
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• pp.88-92
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• 1983

The performance of noncoherent fast frequency-hopped spread spectrum multiple access communication systems with square-law combining over fading channel is presented. The expression for the probalility of error as a performance measure is derived by means of momenting function of the dedecision variables, and the cross-covariance of the fading process the ambiguty function of the transmitted signals.