• 전자공학회논문지S
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• 제36S권8호
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• pp.39-47
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• 1999

본 논문에서는 포항제철의 열연 권취 온도 공정을 제어하기 위한 방법으로 온라인 재학습 가능한 RBF 네트워크(Radial Basis Function network)를 제안한다. 새로 제안된 신경회로망 모델을 이용해 권취 온도 제어 시스템의 열전달 계수를 생성해주는 기조의 규칙 기반 계수표를 대체할 수 있다. 열연 공정 작업의 시간에 따른 변화를 고려하도록 지존의 RBF 네트워크에 부가적인 온라인 재학습용 시냅스 가중치를 도입한다. 부가적인 가중치들로 인해 이미 학습된 전체 데이터들의 특성 정보를 유지하면서 새로 들어오는 데이터들에 대해 온라인 재학습이 이루어진다. 따라서, 제안된 RBF 네트워크는 파국적 간섭(catastrophic interference)효과를 상당히 감소시킬 수 있다. 그리고 거부 네트워크을 도입하여 제어기의 신뢰도을 높일 수 있었고, 실제 현장에 적용한 실험 결과는 기존의 방법보다 평균 2.2퍼센트이상 향상된 성능을 보였다.

• 성인간호학회지
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• 제12권4호
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• pp.497-506
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• 2000

The purpose of this phenomenological study was to explore and describe the experience of people with HIV/AIDS. Three men and three women with HIV/AIDS participated in the study. They were asked open-ended and descriptive questions in order for them to talk about their experience in their own terms. Interviews were audiotaped and transcribed to maintain data integrity and to reduce perceptual bias. The transcripts were analyzed by the Colaizzi method. Member checks from the participants were used to validate the emergent themes. Seven themes emerged from the analysis. 1. People with HIV/AIDS have a strong impact and emotional reaction when receiving positive HIV test results. 2. All people with HIV/AIDS attempt to conceal HIV infection because of fear of stigma or rejection. 3. After the initial brief traumatic reaction to HIV/AIDS diagnosis, all participants feel lonely because they had no one to express or share their own experiences. 4. People with HIV/AIDS reflect on their life, think about the death and dying process and they become depressed. 5. Most participants feel that the family members who know his/her diagnosis are a big source of support. 6. According to the normativeness of infection route of HIV, the degree of guilty feeling differs among participants. 7. Although all participants think medication is a lifeline, the adherence to medication is not maintained because of side effects, denial and concealment of HIV/AIDS. The results of this study may help nurses and other health care workers to implement more efficient nursing strategies for people with HIV/AIDS by more deeply understanding their experience.

• Journal of Power Electronics
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• 제16권5호
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• pp.1904-1917
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• 2016

The moving average filter (MAF) is widely utilized to improve the disturbance rejection capability of phase-locked loops (PLLs). This is of vital significance for the grid-integration and stable operation of power electronic converters to electric power systems. However, the open-loop bandwidth is drastically reduced after incorporating a MAF into the PLL structure, which makes the dynamic response sluggish. To overcome this shortcoming, some new techniques have recently been proposed to improve the transient response of MAF-based PLLs. In this paper, a comprehensive performance comparison of advanced MAF-based PLL algorithms is presented. This comparison includes HPLL, MPLC-PLL, QT1-PLL, and DMAF-PLL. Various disturbances, such as grid voltage sag, voltage flicker, harmonics distortion, phase-angle and frequency jumps, DC offsets and noise, are considered to experimentally test the dynamic performances of these PLL algorithms. Finally, an improved positive sequence extraction method for a HPLL under the frequency jumps scenario is presented to compensate for the steady-state error caused by non-frequency adaptive DSC, and a satisfactory performance has been achieved.

• 한국지역사회생활과학회지
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• 제21권4호
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• pp.605-618
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• 2010

This study was to investigate the effects of children's temperament, parenting behavior, and parenting stress on preschool children's prosocial behavior. The subjects were 190 children consisting of five and six years old and their mothers and fathers. They were selected from 6 kindergartens. Data was collected using the children's prosocial behavior index, the children's temperament index, the parenting behavior questionnaire, and the parenting stress questionnaire. The results were statistically analyzed using t-test, correlation analysis and multiple regression analysis. The study showed that there were some significant differences in children's prosocial behavior according to the children's gender, but there were no significant differences according to the children's age. Correlation analysis indicated that the children's prosocial behavior and children's temperament had significant correlation, especially the children's adaptability and activity indicated high positive correlations. In addition, the children's prosocial behavior and mother's warmth acceptance behavior had significant high positive correlation, and father's rejection restriction behavior had significant high negative correlation. Also, correlation analysis indicated that the children's prosocial behavior and the mother's and father's stress of parent-child dysfunctional interaction and educational distress had significant negative correlations. It was also found that children's gender, mother's permissiveness non- intervention behavior, mother's educational distress, mother's stress of parent-child dysfunctional interaction, and father's stress of parent-child dysfunctional interaction were all significant predictors of the preschool children's prosocial behavior.

• The Journal of Korean Physical Therapy
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• 제16권3호
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• pp.192-204
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• 2004

The surface electromyographic(sEMG) analyses were knee joint angle during open kinetic chain exercise (OKC) and close kinetic chain exercise (CKC) in vastus medialis (VM), vastus lateralis (VL), and rectus femoralis (RF). Ten subjects with normal , aged 20 to 30(X=27.4, SD=3.23), were randomized Statistical techniques for data analysis were applied paired t-test. The 0.05 level of significane was used as the critical level for rejection of the null hypotheses for the study. And the results were: 1) Both OKC and CKC improved the strength of quadriceps muscle as the knee joint flexion was increased. 2) In OKC, the strength of VM was improved the most at the 30 degree angle. 3) In CKC, the strength of VM was improved the most at the 30 degree angle. 4) The VM/VL ratio was the largest at the 10 and 20 degree angles in OKC and CKC. 5) The VM/VL ratio at 10, 20, and 30 degree angles was significantly different between OKC and CKC (P < 0.05). Base on the results, the OKCE is recommended for the knee joint patients, especially for the patellofemoral pain syndrome patients, during the early phase of rehabilitation. In order to improve strength of the quadriceps, muscle strength training at 30 degree angle is recommended. In order to improve VM/VL ratio, 10 and 20 degree angles are recommended during OKCE and CKCE, respectively. Future researches are warranted comparing electromyographic analysis between OKCE and CKCE in the quadriceps at a certain work lead, and muscle strength performance in the quadriceps at different positions of foot.

• 멤브레인
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• 제24권4호
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• pp.317-324
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• 2014

기존의 폴리아마이드 박막 역삼투 복합막(PA TFC RO Membrane)은 우수한 분리투과특성을 지니고 있으나 내염소성이 상대적으로 낮은 단점을 지니고 있다. 본 연구에서는 이를 해결하기 위하여 표면에 -OH나 -COOH 기가 도입된 다공성 지지체를 제조하고, 그 표면에 폴리아마이드 박막을 형성하여 역삼투 복합막을 제조하였다. 제조된 역삼투막의 구조 및 분리투과 특성은 여러 가지 기기분석 방법과 투과테스트 방법으로 분석하였다. 폴리아마이드 박막을 제조하기 위하여 아민계 단량체로는 메타-페닐렌 디아민(MPD)과 2,6-디아민 톨루엔(2,6-DAT)을 사용하였고, 디엑시드계 단량체로는 트리-메소일 클로라이드(TMC)를 사용하였다. 제조된 복합막의 투과도는 800 psi에서 약 $1.0m^3/m^2day$ 이상이었으며 이때 염배제율은 99.0% 이상이었다. 내염소성도 친수성기가 없는 폴리설폰 지지체를 사용한 복합막에 비하여 우수한 것으로 나타났다.

• 인터넷정보학회논문지
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• 제21권5호
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• pp.75-85
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• 2020

The application of Internet technology has created enormous impact on banking sector with the implementation of many techno-oriented services like Internet banking, EFT, branchless banking, Automated Clearing House (ACH) transactions etc. Study of customer's attitude in terms of trust, perceived risk and ease of use of a particular technology is as an important parameter for acceptance or rejection of a technology. To explore the customers'attitude for Internet banking this research is undertaken. The research is carried out in Pokhara valley which is the second largest city and tourism capital of Nepal. The study employs descriptive research design with stratified sampling procedure for eight top commercial banks. A set of 25 customers is taken from each selected 8 banks making a sample size of 200 respondents. A fixed set of question related to demographic factors is provided personally or by visiting the location of the customers of Internet banking service and collected accordingly. Reliability test is performed using Cronbach's alpha and data is analyzed using inferential statistics to present the results of the study. This study provides knowledge on the current scenario of Internet banking and helps banks in cost saving, mass customization, product innovation, improved marketing and communication. This study is very important for financial institutions like banks, government agencies and business houses to understand the perception of customers towards Internet banking and technology as a whole. The study also supplements the gap in literature on technology and banking in Nepal and serves as an important knowledge base.

• 한국항만경제학회지
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• 제30권2호
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• pp.133-143
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• 2014

우리나라는 주요 선진국들이 지역주의를 확산시키고, FTA 체결 회원국 전체의 경제적 부가가치를 증대시킬 수 있다는 점에서 FTA를 적극적으로 추진하고 있다. 우리나라의 현재 FTA 추진 현황은 발효 9건, 타결 3건, 협상진행 6건, 협상재개 여건조성 3건, 협상준비(공동연구 포함) 4건으로, 한 중 FTA이 체결된다면 우리나라의 FTA 교역 비중은 조만간 전체 교역의 50%를 넘어설 것으로 예상된다. 그리고 우리나라 무역의 대부분이 해상을 통해서 이루어짐을 감안할 때 항만을 통한 무역패턴과 수출효과를 파악할 필요가 있다. 최근에는 전통적인 교역이론에서 고려되지 않았던 거리적 위치, 운송비용, 인구 수, 문화적 요인이 교역패턴에 영향을 미친다는 중력모형의 적용이 많이 늘어나고 있다. 이러한 배경 하에서 본고는 패널중력모형을 이용하여 광양항의 주요 교역 상대국의 수출결정요인을 식별하고, FTA가 광양항 수출에 미치는 영향의 크기를 분석하였다. 분석결과, 패널 수준변수들은 불안정적이고 1차 차분 후 안정성을 회복하였다. 다음 단계로 패널 공적분 검정을 통해 패널 수준변수들의 장기적 균형 관계가 존재함을 알 수 있었으며, 하우스만 검정을 통하여 고정효과 모형이 적합함을 밝힐 수 있었다. 패널중력모형 분석결과, 중력모형의 기본전제가 양호하게 성립하고, 지역무역협정의 수출증대 효과가 존재하는 것을 확인할 수 있었다.

• Nuclear Engineering and Technology
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• 제46권2호
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• pp.169-182
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• 2014

High-performance research reactors require fuel that operates at high specific power to high fission density, but at relatively low temperatures. Research reactor fuels are designed for efficient heat rejection, and are composed of assemblies of thin-plates clad in aluminum alloy. The development of low-enriched fuels to replace high-enriched fuels for these reactors requires a substantially increased uranium density in the fuel to offset the decrease in enrichment. Very few fuel phases have been identified that have the required combination of very-high uranium density and stable fuel behavior at high burnup. U-Mo alloys represent the best known tradeoff in these properties. Testing of aluminum matrix U-Mo aluminum matrix dispersion fuel revealed a pattern of breakaway swelling behavior at intermediate burnup, related to the formation of a molybdenum stabilized high aluminum intermetallic phase that forms during irradiation. In the case of monolithic fuel, this issue was addressed by eliminating, as much as possible, the interfacial area between U-Mo and aluminum. Based on scoping irradiation test data, a fuel plate system composed of solid U-10Mo fuel meat, a zirconium diffusion barrier, and Al6061 cladding was selected for development. Developmental testing of this fuel system indicates that it meets core criteria for fuel qualification, including stable and predictable swelling behavior, mechanical integrity to high burnup, and geometric stability. In addition, the fuel exhibits robust behavior during power-cooling mismatch events under irradiation at high power.

• Child Health Nursing Research
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• 제2권2호
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• pp.5-18
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• 1996

The purposes of this study were to measure the degree of perceived uncertainty and to identify the rearing attitudes of mothers with chronically ill children, and to examine the relationship between the perceived uncertainty and the rearing attitude of these mothers. The subjects of this study consisted of 133 mothers with chronically ill children, registered at 2 university hospitals in Seoul. Data was collected from April 1 to May 31, 1996. The Parents' Perception of Uncertainty Scale(28-item 4 point scale) and the Maternal Behavior Research Instrument (49-item 5 point scale) were used. Data was analyzed by Cluster analysis, ANOVA MANOVA and t-test. Results of this study are summarized as follows : 1. Mothers perceived their uncertainty to be slightly high (Mn 2.48). The degree of perceived uncertainty by the four components slightly differed unpredictability(2.72), lack in clarity(2.58), vagueness (2.52) and lack of information(2.04) . The degree of perceived uncertainty of mothers with ill children revealed to be influenced significantly by the age of the ill children, duration of illness after the diagnosis, and the experience of hospitalization. 2. Among the rearing attitudes : moderatlely high affective(Mn 3.98) and resrictive(Mn 3.58) attitudes of mothers toward their ill children were identified. Mothers tend to give positive evaluations of their childrens' behaviors (Mn 3.38) and less rejection(Mn 2.81). 3. Mothers' rearing attitude were correlated with the degree of perceived uncertainty in illness ; mothers in the Low Perceived Uncertainty Group (Mn 1.99) revealed the highest affective (Mn 4.08), the lowest resrictive(Mn. 2.72) attitudes and tendency to give positive evaluations of their childrens' behaviors (Mn 3.54) compared to the High Perceived Uncertainty Group(Mn 3.26) and Moderate Perceived Uncertaity Group(Mn 2.57). 4. The degree of perceived uncertainty, the duration of illness after the diagnosis and the experience of hospitalization revealed to be significantly influential to the rearing attitude of mothers with chronically ill children. From the above results, it can be concluded that predicting and controlling mothers' uncertainty are necessary for improved, efficient nursing interventions and normal growth & development of the chronically ill children.