• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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• pp.193-195
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• 2009

In this paper, we propose an effective compression method for electrocardiogram(ECG) signals. 1-D ECG signals are reconstructed to 2-D ECG data by period and complexity sorting schemes with image compression techniques to Increase inter and intra-beat correlation. The proposed method added block division and mean-period normalization techniques on top of conventional 2-D data ECG compression methods. JPEG 2000 is chosen for compression of 2-D ECG data. Standard MIT-BIH arrhythmia database is used for evaluation and experiment. The results show that the proposed method outperforms compared to the most recent literature especially in case of high compression rate.

• 한국산학기술학회논문지
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• 제11권5호
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• pp.1601-1607
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• 2010

본 논문에서는 FMEA (Failure Mode Effect Analysis) 기법을 적용한 우편기계 유지보수 방법 제시하였다. 제안된 방법은 우편기계 모듈 및 부품에 대해 고장 유형을 정의하고, 고장 유형별 시스템에 주는 영향과 고장 빈도 및 검출도 등을 정의하여 고장 유형에 대한 시스템 위험도를 계산하여 그 값에 기반하여 점점 항목과 점검 주기를 조정하도록 하므로 시스템의 고장을 사전에 예방하고 시스템 가동율을 높이도록 하는 효율적인 유지보수 방법이다. 실제 현장에서 운영되고 있는 소형 통상 우편 구분 기계에 대해 제안된 방법의 적용 예를 보였다. 따라서 제안된 방법은 향후 국내 우편기계 유지보수에 적용시 유지보수 용이성과 효율성을 높일 것으로 기대한다.

• 수산경영론집
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• 제49권4호
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• pp.19-36
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• 2018

Overstock in aquaculture is a matter of concern in aquaculture management. To sort fish based on fingerling size in case of overstocking is an important problem in aquaculture farm. This study aims to determine the amount of fry overstock and sorting time in aquaculture farm. This study builds a mathematical model that finds the value of decision variables to optimize objective function summing up the fingerling purchasing cost, aquaculture farm operating cost and feeding cost under mortality and farming period constraints. The proposed mathematical model involves following biological and economical variables and coefficients: (1) number of fingerlings, (2) sorting time, (3) fish growth rate and variation, (4) mortality, (5) price of a fry (6) feeding cost, and (7) possible sorting periods. Numerical simulation is presented herein. The objective of numerical simulation is to provide decision makers to analyse and comprehend the proposed model. When extensive biological data about growth function of fry becomes available, the proposed model can be widely applicable to real aquaculture farms.

• Journal of Power Electronics
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• 제14권6호
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• pp.1109-1118
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• 2014

A Fundamental Frequency Sorting Algorithm (FFSA) is proposed in this paper to balance the voltages of floating dc capacitors for Modular Multilevel Converters (MMCs). The main idea is to change the sequences of the CPS-PWM carriers according to the capacitor voltage increments during the previous fundamental period. Excessive frequent sorting is avoided and many calculating resources are saved for the controller. As a result, more sub-modules can be dealt with. Furthermore, it does not need to measure the arm currents. Therefore, the communication between the controllers can be simplified and the number of current sensors can be reduced. Moreover, the proposed balancing method guarantees that all of the switching frequencies of the sub-modules are equal to each other. This is quite beneficial for the thermal design of the sub-modules and the lifetime of the power switches. Simulation and experimental results acquired from a 9-level prototype verify the viability of the proposed balancing method.

• 전자공학회논문지SC
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• 제46권4호
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• pp.23-27
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• 2009

이 논문에서는 효율적인 2D 방식의 심전도 신호 압축 방법을 제안한다. ID 심전도 신호는 2D 신호로 변환된 후 주기와 복잡도를 바탕으로 정렬되고 상호간의 상관 관계를 적용한다. 그 다음 불연속이 발생하는 지점을 기준으로 각 구간을 분할하고 주기의 평균으로 정규화 한 후 보통의 영상 신호를 압축하는 방식과 유사한 방식으로 정렬된 2D 신호를 압축한다. 압축 방식으로는 JPEG 2000이 사용되었으며 실험 데이터는 심전도 압축에서 표준화되어 사용되는 MIT-BIH arrhythmia database를 사용하였다. 제안된 방법은 기존의 2D 심전도 압축 방식과 비교하여 보다 개선된 성능을 보여 준다.

• 유기물자원화
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• 제25권2호
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• pp.15-26
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• 2017

본 연구는 S시 S구의 재활용품 배출특성을 조사 및 분석을 통해 재활용품 선별장에서 재활용품 선별율을 조사하였다. 재활용품 배출특성을 조사하기 위해서 발생원, 수집운반, 선별단계별로 나누어 분석하였다. 분석결과, 재활용품의 발생량 원단위의 전체 평균은 0.121kg/일 인, 지역별 재활용품의 수거주기는 보통 주3회(월수금 혹은 화목일)로 나타났으며, 차량별 혼합재활용품의 밀도는 평균 $202.4kg/m^3$로 나타났다. 선별단계에서의 현황분석을 진행한 결과, 혼합재활용품의 반입량은 평균 1,154.6톤/달, 겉보기밀도의 평균은 $181kg/m^3$, 선별재활용품의 양은 평균 448.5kg/달, 잔재물의 밀도는 $48kg/m^3$으로 나타났다. 선별장으로 입고된 혼합재활용품에서 유가품 선별율은 약 38.85%이며 잔재물은 약 55.90%로 나타났다. 전체 잔재물 7,744.8톤 중 유가품은 약 4,272.1톤이 존재하는 것으로 나타났다. 활용가능한 유가품의 수거효율을 높이기 위한 방안으로는 거점수거 활성화, 선별시설 자동화 및 현대화, 잔재물의 자원화 등이 검토되었다.

• 한국전문물리치료학회지
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• 제3권3호
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• pp.44-58
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• 1996

The purpose of this study was to compare and evaluate various hand functions in the most common position (chair sitting, standing, floor sitting) used by cerebral palsied children with spastic diplegia. The results, analysed statistically, could be useful in suggesting treatment strategy for the improvement of hand function in such patient. For this study, 27 children mild or moderate spastic diplegia were chosen. They were patients of the Rehabilitation Hospital, Yonsei University Medical Center. Both dominant and nondominant hands were tested by the Box and Block Test. Bilateral hand function was tested by bead striding and card sorting activities. Collected data was analysed using univariate correlation analysis and MANOVA. Results were as follows: 1) In chair sitting there was a significant positive correlation between dominant hand scores in the Bloc and Box Test and chronological age, gestation period, and time of treatment initiation. In bilateral hand function, card sorting scores correlated positively with time of treatment initiation. 2) In standing, there was a significantly positive correlation between dominant hand scores in the Block and Box Test and time of treatment initiation. 3) In floor sitting, there was a significantly positive correlation between the dominance hand scores in the Block and Box Test and the tine of treatment initiation. Bead stringing, a bilateral hand activity, correlated positively with gestation period and birth weight but negatively with the postnatal incubation period. 4) That score of children who walked showed no significant difference in any of the three postures. 5) Highest test scores in children who could nat walk were in the Box and Block Test for nondominant hand in bead stringing for bilateral hand function. There scores occurred with the children in thee chair sitting posture. The results showed that, in order to improve hand function in children with spastic diplegia, it is necessary to maintain a well supported upright trunk posture with variations allowed for relevance to the chosen position of thee improvements hand activity being performed.

• 한국도서관정보학회지
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• 제27권
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• pp.171-209
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• 1997

The results of the study can be summarized as follows. The Shu-mu Da-wen was selected and compiled by Zhang Zhi Dong at the end of Qing Dynasty as a reading list for students preparing for the state examination and for the purpose of choosing the best from several versions. Whether it was compiled and edited by Zhang was in dispute. But it is almost certain that Zhang was the main editor because Shu-mu Da-wen showed his political, educational and scientific thoughts and knowledge distinctively. The followings are characteristics of Shu-mu Da-wen being compared with Si-ku Quan-shu Zong-mu Ti-yao. 1. In Jing-bu, the Confucian classics are divided into Zheng-jing Zheng-zhu and 'Lie-chao Jing-zhu Jing-shuo Jing-ben kao-zheng. Zheng-shi lei is divided into Zheng-shi fen he ke ben and Zheng-shi zhu bu biao pu kao-zheng. It is the special sorting method to include Du-ben lei in Jing-bu and Chu xue du-ben in Bie-lu in order to provide first learners for reading order. 2. Shi-bu included Gu-shi newly and Di-li lei is divided into Gu Di-li and Jin di-li in Shi-bu. Tian-wen Suan-fa lei is divided into Zhong-fa and Xi-fa in Zi-bu. Zhang distinguished between old books and contemporary ones to find out the origin and include newly published books in the East and the West. 3. Zhou-Qin zhu-zi is newly added to Zi-pu. In Ji-pu, Bie-ji and Zong-ji are categorized according to their style and period respectively. This show the new sorting method which added classifying system concerning academic development. It is the prominent feature in the compiling system to make Bie-lu and Cong-shu respective chapters. With those characteristics the Shu-mu Da-wen had been edited and published several times. It had a wide effect not only on compiling methods of cataloging afterwards and but also on classification systems before decimal classification was introduced in China.

• 원예과학기술지
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• 제18권1호
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• pp.22-27
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• 2000

배를 캐나다 등 외국에 수출할 시는 수출 상대국의 검역요건에 맞추어 주어야 한다. 수출국 특히 캐나다에 수출되는 배의 검역상 문제점을 찾아 그 해결법을 제시하고자 수출 조건에서 수출 단계별 검역규제병해충을 조사하였다. 조사 결과 복숭아명나방과 복숭아순 나방이 발견되었으나 이들은 저온처리로 인하여 모두 사멸되었다. 해충은 복숭아심식나방류 유충이 과실로 이동되는 시기에 방제를 소홀히 한 생산지 과실에서 발견되었으므로 복숭아명나방 등 심식나방류 유충이 과실로 이동되는 시기에 예찰을 철저히 하여 적기방제 하는 것이 필요하다. 한편 병원균은 과실의 선과 작업과 이동할 때 생긴 압상, 자상 등 상처를 통하여 Penicillium sp. 및 Alternaria sp.의 부생균이 감염된 것이 발견되고 검역병원균은 발견되지 않았다. 그러나 이들 병원균도 비록 비검역병원균이라고 하지만 부패과실이 일정비율 초과할 경우 수출자가 수입자에게 이를 보상하여야 하므로 수출배 중 외피가 얇은 황금배 등은 수확 후 운송과정과 선과장 선과 작업 중에 특별한 주의가 요구된다.

• 가정간호학회지
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• 제18권1호
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• pp.40-47
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• 2011

Purpose: This study investigated changes in neurocognitive function over a 2-month period of board game therapy in patients with schizophrenia. Method: Twenty-one schizophrenic patients treated with board game therapy and nineteen control schizophrenic patients were evaluated with neuropsychological and clinical tests, such as the Wisconsin Card Shorting Test (WCST). The same tests were re-administered after 2 months of board game therapy. Results: At the first series of neuropsychological tests, no difference was seen in performance, demographical aspects, or clinical severity among both patient groups. After 2 months, the group receiving board game therapy showed significant improvement of WCST performances compared to the controls. However, no difference was observed in clinical symptoms between the groups. Conclusion: The results of cognitive enhancement in patients playing board games indicates that board game play, easily used in an inpatient setting, is a promising tool for executive function improvement in chronic schizophrenic patients.