• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 춘계학술대회 논문집
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• pp.254-259
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• 2001

There are advantages in the installation of dual subsea pipelines over two separate single lines. In many case it can reduce the cost for trench, back-filling and installation. However the installation of dual pipelines often requires technical challenges. Dual Pipelines should be placed to be stable to external loading not only during the installation but also in the design life. Dual pipelines in trench can reduce the influence of external forces. To investigate applied forces as slope changes, number of experiments are conducted with PIV (Particle Image Velocimetry) in a circulating water channel. Numerical approaches are also made to compare with experimental results. The velocity fields around dual pipelines in trench are investigated and analysed. Comparison of both results show similar pattern of flow around dual pipelines. it is proved that the trench slope affects the pipeline stability significantly. The results can be applied in the stability design of dual pipelines in trench section. The complex flow patterns can be referenced effectively linked in the understanding of fluid around circular bodies in trench.

• 한국정보통신학회논문지
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• 제12권8호
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• pp.1448-1455
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• 2008

본 논문은 대부분의 Linux 운영체제에서 지원해 주는 System V의 IPC 중 하나인 Shared Memory를 Dual Core 시스템 상에서 동작하도록 설계한다. Linux에서 사용되는 Shared Memory는 동일한 메모리 영역에 여러 개의 프로세스가 접근할 수 있도록 해 주는 기술이 다. 본 논문에서는 Shared Memory의 큰 두 갈래 중 커널 단계에서 처리되는 SVR(System V Release) 형식의 Shared Memory를 다룬다. 본 논문에서는 리눅스 운영체제의 공유 메모리 기능을 Dual Core 시스템에서 동작하도록 설계한다. 본 논문에서 제안하는 Dual Core 시스템에서 공유 메모리 기능 설계 방안은 듀얼 코어를 활용하여 기존의 단일 처리기 시스템에서보다 성능을 향상시킬 수 있도록 한다. 공유 메모리를 이용한 프로세스의 동작이 별개의 CPU에서 동작되도록 함으로써 성능 향상을 꾀한다.

• PNF and Movement
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• 제15권3호
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• pp.361-371
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• 2017

Purpose: The purpose of this study was to examine the effects of performing a dual task on gait velocity, temporospatial variables, and symmetry in subjects with subacute stroke. Methods: The study included 14 independent community ambulators with gait velocity of 0.8m/s. The Korean mini-mental state examination, the Berg balance scale, the Trunk impairment scale, and the Fugl-Meyer assessment scale were used to recruit homogeneous subjects. Subjects performed a single task (10m ambulation at a comfortable speed) and a dual task (10m ambulation at a comfortable speed while carrying a water-filled glass). Gait variables were examined with the OptoGait system. Results: The findings of this study were as follows: 1) Gait velocity decreased significantly in the dual-task condition as compared to the single task condition. 2) There were no significant differences between the paretic and non-paretic stances. 3) Paretic swing decreased significantly in the dual-task condition as compared to the single task condition. 4) The non-paretic, double-limb support phase increased significantly in the dual-task condition as compared to the single- task condition. 5) There was no significant difference in temporal symmetry. 6) Non-paretic step length decreased significantly in the dual-task condition as compared to the single-task condition. 7) There was no significant difference in spatial symmetry. Conclusion: Performing dual tasks decreases gait velocity, paretic swing phase, and non-paretic step length, while it increases non-paretic double limb support. In addition, although there is no difference in temporospatial symmetry, there is high inter-subject variability in temporospatial symmetry. Thus, dual tasks should be selected in accordance with the functional level of the hemiplegic patient, and inter-subject variability of the individual should be considered when dual tasks are considered for gait-training of hemiplegic patients.

• Nutrition Research and Practice
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• 제10권6호
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• pp.583-589
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• 2016

BACKDROUND/OBJECTIVE: Constipation is a condition that can result from intestinal deformation. Because humans have an upright posture, the effects of gravity can cause this shape deformation. Oligosaccharides are common prebiotics and their effects on bowel health are well known. However, studies of the physiological functionality of a product that contains both lactulose and galactooligosaccharides are insufficient. We investigated the constipation reduction effect of a dual-type oligosaccharide, Dual-Oligo, in loperamide-treated rats. MATERIALS/METHODS: Dual-Oligo consists of galactooligosaccharides (15.80%) and lactulose (51.67%). Animals were randomly divided into four groups, the normal group (normal), control group (control), low concentration of Dual-Oligo (LDO) group, and high concentration of Dual-Oligo (HDO) group. After 7 days of oral administration, fecal pellet amount, fecal weight, watercontent of fecal were measured. Blood chemistry, short-chain fatty acid (SCFA), gastrointestinal transit ratio and length and intestinal mucosa were analyzed. RESULTS: Dual-Oligo increased the fecal weight, and water content of feces in rats with loperamide-induced constipation. Gastrointestinal transit ratio and length and area of intestinal mucosa significantly increased after treatment with Dual-Oligoin loperamide-induced rats. A high concentration of Dual-Oligo tended to produce more acetic acid than that observed for the control group, and Dual-Oligo affected the production of total SCFA. Bifidobacteria concentration of cecal contents in the high-concentration oligosaccharide (HDO) and low-concentration oligosaccharide (LDO) groups was similar to the result of the normal group. CONCLUSIONS: These results showed that Dual-Oligo is a functional material that is derived from a natural food product and is effective in ameliorating constipation.

• 대한통합의학회지
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• 제8권2호
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• pp.11-20
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• 2020

Purpose : The purpose of this study was to research the effects of dual-hemisphere transcranial direct current stimulation (dual tDCS) and modified constraint-induced movement therapy (mCIMT) to improve upper extremity motor function after stroke. Methods : The study period was from August 2019 to November 2019, and included 24 patients who met the selection criteria. Participants were divided into 2 groups: dual tDCS and mCIMT, and sham dual tDCS and mCIMT group. Dual tDCS and mCIMT group performed mCIMT immediately after applying dual tDCS for 20 minutes, and sham dual tDCS and mCIMT group performed mCIMT immediately after applying sham tDCS for 20 minutes without turning on the power source. Total interventions were conducted 5 times per week for 4 weeks, and mCIMT was conducted for 30 minutes per session for both experimental and control groups. Fugl-Meyer assessment (FMA) and Motor Activity Log scale (MAL) were analyzed before and after 4 weeks of intervention. Results : Both experimental and control groups showed significant changes in FMA, Amount of Use (AOU), and Quality of Movement (QOM) of MAL. When the differences between groups was compared using ANCOVA, the experimental group showed a greater improvement in FMA and AOU of MAL than the control group. Conclusion : In order to enhance the effect of improving upper limb function of stroke patients, dual tDCS could be applied to provide more effective treatment in the clinical setting. Further studies will be needed in larger groups of stroke patients, including long-term follow-up, and multi-group comparisons through the establishment of anodal tDCS and mCIMT, cathodal tDCS, and mCIMT groups to clarify the effects of dual tDCS. In addition, research is needed to establish a protocol for tDCS, and this evidence-based intervention protocol is expected to be used in the clinical setting as an interventional method for various purposes.

• 한국전자파학회논문지
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• 제21권12호
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• pp.1447-1453
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• 2010

본 논문에서는 두 개의 이중 모드 공진기를 이용하여 이중 대역 통과 필터를 구현하였다. 단락 스터브를 이용한 이중 모드 공진기는 inter-digital 커패시터와 계단형 임피던스를 이용하여 소형화 되었다. 두 개의 이중 모드 공진기는 각 통과 대역의 중심 주파수에서 동작하도록 설계되었다. 전송 영점이 통과 대역의 상측이나 하측에 위치하여 차단 특성을 향상시킬 수 있다. 이중 대역 동작을 위해 이중 급전 구조를 이용하였다. 제안된 구조는 WLAN 대역인 2.45/5.25 GHz에서 동작하도록 설계 제작되었다. 제안된 이중 대역 통과 필터의 크기는 $10.83\;mm{\times}5.3\;mm$이다.

• 한국사회복지학
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• 제47권
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• pp.178-205
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• 2001

This article investigates 295 social workers in order to find out how much they believe that each behavior related to dual relationships is ethical and with how many clients they engaged in these behaviors. This article, based on the literature, explores three areas of dual relationships which are sexual, bartering, and private dual relationships. The results from the research were 1) The social workers tend to believe that while sexual and bartering dual relationships are less ethical, private dual relationships are more ethical. Meanwhile, they have little experience to engage in all areas of dual relationships; 2) Compared to beliefs and experiences, the social workers believe that each behavior is ethical, but they have less experienced the same behavior. However, the result of strong correlations between beliefs and experiences shows that the more the social workers believe that the behaviors are ethical, the more they tend to engage in the behaviors; 3) Based on socio-demographic characteristics, male social workers tend to accept dual relationships as ethical behavior than their female counterparts do. And those who are practicing in health settings tend to believe that the behaviors related to dual relationships are less ethical than those who are practicing in the other areas of the profession do. Finally, the research recommends that enhancing social worker's self-awareness and professional maturity is needed in order to prevent the occurrence of dual relationship engagement. Also, social work professional associations and agencies should provide education, training, and institutional restrictive devices for dealing with unethical dual relationships.

• 가정과삶의질연구
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• 제21권2호
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• pp.175-185
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• 2003

The purpose of this study was to investigate whether there is any difference between the dual residence couples and the single residence couples in terms of the situation of child care, development of their child and mother's parenting guilty or parenting stress. Also, this study aimed to explore the variables which influence parenting guilty and parenting stress of dual residence mothers. The 178 mothers of three to eight tear-old participated the survey. Half of them were dual residence mothers and another half were those of single residence. These two groups were matched in terms of the occupation of the mother and the age of the child. Major finding were as follows. 1) Compared with single residence couples, dual residence couples used multiple methods of child care. And they depended maternal families more than paternal ones as a care-giver. They also payed much more for the child care than single residence couples. 2) Children of the dual residence couples did not differ with those of the single residence couples in terms of cognitive and social development. 3) Dual residence mothers had more parenting guilty than those of single residence while these two groups did not differ in terms of parenting stress. 4) While dual residence mother's parenting guilty was significantly related with the amount of information provided by the paternal families, their parenting stress was significantly related with the frequencies of communicating with the husband, the mother's age, the flexibility of time in the mother's work place, the mother's orientation to the career, and the supports of the husband. In conclusion, dual residence families in Korea were not so negative as expected. Furthermore, this study suggests that the parenting difficulties of the dual residence mothers could be decreased by the change of social and economic situations and the psycho-social support of the husband.

• 융합정보논문지
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• 제10권12호
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• pp.216-225
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• 2020

본 연구는 체계적 고찰을 통해 선정된 연구를 질적 분석하여 인지장애가 있는 노인에게 실시된 이중과제의 적용방법, 결과측정방법, 중재효과를 알아보고자 시행되었다. 본 연구는 2010년 1월부터 2019년 12월까지 등록된 연구를 검색하였다. 전자 데이터베이스 PubMed, ProQuest를 이용하였으며, 검색어는'dual task' OR 'multi modal' AND 'mild cognitive impairment' OR 'dementia' OR 'Alzheimer's disease' AND 'intervention' OR 'rehabilitation를 사용하였다. 최종 선정된 연구는 8편이었다. 이중과제는 단독중재로서 적용되기보다 다른 운동중재와 함께 구성된 복합중재의 부분으로 이용되고 있었다. 이중과제의 인지 및 운동과제는 각각 별개의 내용으로 서로 독립적인 과제가 대부분이었다. 평가는 MMSE, CERAD와 같은 전반적인 인지기능평가와 집행기능평가, 기억력평가 등이 포함되었고 이중과제의 직접적인 향상을 보기위하여 Dual task cost를 이용하기도 하였다. 본 연구는 이중과제의 연구 및 임상적 적용을 위한 기초적인 자료로서 이용될 수 있을 것으로 생각된다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.277-280
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• 2005

In this paper, we propose a frequency synthesizer for dualband repeater. The dual-band RF technology for applications to the wireless repeater for CDMA and WCDMA mobile communications has been developed in this paper. The dualband PLL module consisted of dual-band VCO and one PLL IC has been developed. The main technological efforts for the dual-band PLL module is to suppress the intermodulation distortion by applying the miniature ceramic filter using the slow wave characteristics. The dual-band miniature RF module including dual-band PLL module and one MCU controller is very attractive for applications to the miniature dual-band RF mobile repeaters.