• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1292-1306
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• 2014

This paper proposes a space-polarization division multiple access (SPDMA) system that has limited feedback channels. The system simultaneously serves data streams to multiple mobile users through dual-polarized antenna arrays, by using pre-determined sets of precoding vectors that are orthogonal in both space and polarization domains. To this end, a codebook whose elements are sets of the precoding vectors is systematically designed based on the discrete Fourier transform (DFT) matrix and considering the power imbalance of polarized channels. Throughput of the SPDMA system is evaluated and compared to that of space division multiple access (SDMA) system, according to the various parameters including cross polarization discrimination (XPD). The results show that the throughput of SPDMA system outperforms that of SDMA in the environments of high XPD with many mobile users.

• 충청수학회지
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• 제30권4호
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• pp.449-457
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• 2017

In this paper we study several generalizations of greatest common divisor of GCD domain with always the greatest common divisor.

• 한국사회복지학회:학술대회논문집
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• 한국사회복지학회 2004년도 춘계학술대회 자료집
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• pp.365-382
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• 2004

The purpose of this study was to explore the concepts of health among people with mobility disabilities in order to develop a new holistic model of health and to identify implications for social work practice. A qualitative study based on face-to-face interviews with people with mobility disabilities was conducted. Nine consumers and nine social workers with mobility disabilities participated in the study. Social constructionism, heuristic paradigm, empowerment paradigm, and strength perspectives were used to form conceptual foundations to guide the study. Study participants' holistic descriptions of the concept of health encompassed five domains: biological/physical, mental/emotional, financial, relationships with others, and spiritual. Participants described health as harmony among these five domains. Harmony indicates that all five domains contribute to the concept of health, and that each domain is related to the others. Participants also viewed disability and health as an interconnected whole, not separate concept. The conceptual model developed in this study expands on the existing concepts of health by considering multiple factors at the personal and environmental levels, as well as interactions among the factors and between the levels. The personal level has five domains: biological/physical, mental/emotional, spiritual, financial, and relationships with others. The environmental level has also five domains: relationship with others, financial, social programs, social attitudes toward peoplewith disabilities, and physical environment. All factors under the personal and environmental levels also affect each other. The holistic concept of health for people with disabilities is not solely a part of the person, but rather is a function of the interaction between the person and their environment. The study demonstrated that people with disabilities have strength and resiliency, and health is an attainable goal for them, particularly when environmental and cultural barriers are addressed. The focus of social work practice should be the removal of those barriers encountered by their consumers with disabilities, as well as, the enhancement of internal factors that facilitate well-being.

• 여성건강간호학회지
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• 제1권2호
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• pp.275-286
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• 1995

The purpose of this study was to investigate health promoting life-style(HPLS) and its predictors by menstrual status among middle-aged women. The HPLS was conceptualized to have six domains such as self-actualization, responsibility for health, nutrition, exercise, interpersonal relationships, and stress control. Those predictors included three sociodemographic factors and five cognitive factors. Menstrual status was classified into three stages : regular menstrual(premenopausal), menopausal, and postmenopausal stages. Data were collected from 240 women between 30 and 59 years through self-reported questionnaires. Chi-square test, ANOVA, and stepwise multiple regression techniques were used to analyze the data. The results are summarized as follows : 1. The HPLS activities, when aggregated, were not statistically different across the three groups. The activities of the domains of interpersonal relationships and self-actualization were higher then those of other domains. On the other hand, the activities of the domains of exercise and responsibility for health were lower than those of the other domains. 2. The predictors explained 27.2%, 43.8%, and 41.6% of the variance of HPLS in the regular menstrual, the menopausal, and the postmenopausal groups, respectively. 3. In the regular menstrual group, total HPLS was significantly predicted by monthly income, family support, number of family members and education level at the .05 level in the HPLS. 4. In the menopausal group was significantly predicted by self efficacy. 5. The HPLS activities of the postmenopausal group were significantly predicted by family support, self efficacy, and monthly income at the .05 level in the HPLS.

• 한국초등과학교육학회지:초등과학교육
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• 제24권3호
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• pp.301-309
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• 2005

The purpose of this study was to investigate the measuring range of portfolio assessment on students' abilities, using correlation coefficients of portfolio assessment with four other assessment methods. A portfolio system was developed based on low units of elementary fourth grade science, and applied to three fourth-grade science classes in Daejeon Metropolitan area and Gyunggi-do. Four different assessment methods, multiple-choice (short answer type), essay-type item, mind-mapping and laboratory assessment were also administered and scored by two elementary teachers attending graduate school. Correlation coefficients between portfolio assessment and four assessment methods were calculated with SPSS. Portfolio assessment showed moderate correlation with multiplechoice (short answer), essay-type, and mind-mapping, and low correlation with laboratory assessment. Portfolio assessment showed high correlation with multiple-choice assessment in 'understanding' and 'application' domains, but showed low correlation in 'recall' and 'inquiry' domains. In conclusion, portfolio assessment could measure various abilities measured by other assessment methods.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권9호
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• pp.4144-4165
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• 2018

Software-defined networking (SDN) has emerged as a promising technology for network programmability and experiments. In this work, we focus on virtual network embedding in multiple controllers SDN network. In SDN virtualization environment, virtual SDN networks (vSDNs) operate on the shared substrate network and managed by their each controller, the placement and load of controllers affect vSDN embedding process. We consider controller placement, vSDN embedding, controller adjustment as a joint problem, together considering different quality of service (QoS) requirement for users, formulate the problem into mathematical models to minimize the average time delay of control paths, the load imbalance degree of controllers and embedding cost. We propose a heuristic method which places controllers and partitions control domains according to substrate SDN network, embeds different QoS constraint vSDN requests by corresponding algorithms, and migrates switches between control domains to realize load balance of controllers. The simulation results show that the proposed method can satisfy different QoS requirement of tenants, keep load balance between controllers, and work well in the acceptance ratio and revenue to cost ratio for vSDN embedding.

• Journal of Information Science Theory and Practice
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• 제3권1호
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• pp.6-23
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• 2015

This study develops an effective method for sentiment analysis of user-generated content on drug review websites, which has not been investigated extensively compared to other general domains, such as product reviews. A clause-level sentiment analysis algorithm is developed since each sentence can contain multiple clauses discussing multiple aspects of a drug. The method adopts a pure linguistic approach of computing the sentiment orientation (positive, negative, or neutral) of a clause from the prior sentiment scores assigned to words, taking into consideration the grammatical relations and semantic annotation (such as disorder terms) of words in the clause. Experiment results with 2,700 clauses show the effectiveness of the proposed approach, and it performed significantly better than the baseline approaches using a machine learning approach. Various challenging issues were identified and discussed through error analysis. The application of the proposed sentiment analysis approach will be useful not only for patients, but also for drug makers and clinicians to obtain valuable summaries of public opinion. Since sentiment analysis is domain specific, domain knowledge in drug reviews is incorporated into the sentiment analysis algorithm to provide more accurate analysis. In particular, MetaMap is used to map various health and medical terms (such as disease and drug names) to semantic types in the Unified Medical Language System (UMLS) Semantic Network.

• 한국전자통신학회논문지
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• 제8권9호
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• pp.1373-1381
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• 2013

이 연구는 지방공무원의 직무스트레스와 우울수준, 우울에 영향을 미치는 직무스트레스 요인을 파악하고자 하였다. 광주광역시 서구의 지방 공무원 734명을 대상으로 한국인 직무스트레스와 우울도구를 이용하여 조사하였다. 조사변수는 일반적 특징, 직업 관련 특징, 직무스트레스(KOSS), 우울(CES-D)을 자기기입식 설문지를 사용하였다. 분석 방법은 t-검정, 분산분석과 피어슨의 상관분석, 다중회귀분석을 사용하였다. 연구 결과를 종합해 보면 직무스트레스 점수는 $44.38{\pm}7.96$ 점으로 전문가 집단과 유사했으며, 우울은 $14.46{\pm}10.19$ 점으로 나타났다. 다중 회귀분석 결과 직무스트레스 하부요인 중 우울에 영향을 미치는 요인으로는 직무 요구, 직무 불안정, 보상 부적절임을 알 수 있었다.

• Journal of electromagnetic engineering and science
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• 제18권4호
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• pp.254-260
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• 2018

In this study, we suggest an emulator for generating multiple heterogeneous interference signals in the Korean radio frequency identification/ubiquitous sensor network (RFID/USN) frequency band. The proposed emulator uses only one universal software radio peripheral to generate multiple heterogeneous interference signals more economically. Moreover, the physical and media access control parameters can be adjusted in real time using the LabVIEW program, thereby making it possible to create various time-varying interference environments easily. As an example showing the capability of the proposed emulator, multiple interference signals consisting of a frequency-hopping RFID signal and two LoRa signals with different spreading factors were generated. The generated signals were confirmed in both frequency and time domains. From the experimental results, we verified that our emulator could successfully generate multiple heterogeneous interference signals with different frequency and time domain characteristics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1850-1851
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• 2007

To the Boundary Scan, this architecture in Scan testing of design under the control of boundary scan is used in boundary scan design to support the internal scan chain. The internal scan chain has single scan-in port and single scan-out port that multiple scan chain cannot be used. Internal scan design has multiple scan chains, those chains must be stitched to form a scan chain as this paper. We propose an efficient Boundary Scan test structure for multiple clock testing in design.