• 제어로봇시스템학회논문지
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• 제13권5호
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• pp.406-413
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• 2007

This paper proposes a self-recurrent wavelet neural network(SRWNN) based adaptive backstepping control technique for the robust steering control of autonomous underwater vehicles(AUVs) with unknown model uncertainties and external disturbance. The SRWNN, which has the properties such as fast convergence and simple structure, is used as the uncertainty observer of the steering model of AUV. The adaptation laws for the weights of SRWNN and reconstruction error compensator are induced from the Lyapunov stability theorem, which are used for the on-line control of AUV. Finally, simulation results for steering control of an AUV with unknown model uncertainties and external disturbance are included to illustrate the effectiveness of the proposed method.

• 한국간호교육학회지
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• 제6권1호
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• pp.23-35
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• 2000

This qualitative nursing research used a hermeneutic phenomenological approach to discovery of meaning of the nursing students' clinical experience in junior colleges. Data collecting was utilized by in- depth face-to-face interviews of 10 sophomores who were participating in their first clinical experience. The following themes of the experience emerged. 1) The first step of fear (fear, being embarrassed) 2) Rhythmical patterning of theory and practice(disappointment of nurses, recognition of the gap between the theory and practice, the conflict between medical doctors and nurses, trouble with the students from other colleges, confusion from nurses' educational and noneducational attitudes, burden of responsibility for nurses' jobs, and the tiresome nature of repeated practice) 3) Discovery of changing self, awareness of self-expansion (awareness of professional nurses' roles, formation of self-confidence, changing of one's state of mind) From this study essential theme of clinical experience of nursing student's was identified, and continuous efforts to establish better adaptation of nursing students to clinical practice are required.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.29.1-29
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• 2001

Neuro-fuzzy systems are multi-layered connectionist networks that realize the elements and functions of traditional fuzzy logic control/decision systems. A trained neuro-fuzzy system is isomorphic to a fuzzy logic system, and fuzzy IF-THEN rule knowledge can be explicitly extracted from the network. This talk presents a brief introduction to self-adaptive neuro-fuzzy systems and addresses some recent research results and applications. Most of the existing neuro-fuzzy systems exhibit several major drawbacks that lead to performance degradation. These drawbacks are the curse of dimensionality (i.e., fuzzy rule explosion), inability to re-structure their internal nodes in a changing environment, and their lack of ability to extract knowledge from a given set of training data. This talk focuses on our investigation of network architectures, self-adaptation algorithms, and efficient learning algorithms that will enable existing neuro-fuzzy systems to self-adapt themselves in an unstructured and uncertain environment.

• Journal of Smart Tourism
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• 제2권3호
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• pp.5-15
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• 2022

As the utilization of technology in the tourism field becomes familiar, it greatly impacts people's tourism activities. These changes could also affect the behavior of tourists during the pandemic. To investigate consumers' adaptation to the self-service technology (SST) environment during the coronavirus disease of 2019 (COVID-19) pandemic, we adopted a model of absorptive capacity as the main framework for empirical research. To track the social effects of COVID-19, consumers' behavioral intentions for four different points in time are collected. The analysis was conducted using latent growth and structural equation modeling. We set the organizational and environmental characteristics as the first step of the model, with assimilation and trust as a middle step. Intention to use a kiosk is placed at the final step as an exploit. Findings indicate that organizational characteristics and environmental characteristics positively influenced assimilation and trust, except for environmental characteristics. Consumers' assimilation in SST encourages immediate intention to use a kiosk. Consumers' trust in kiosks positively impacts both immediate and continuance intention to use a kiosk during COVID-19.

• 한국콘텐츠학회논문지
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• 제13권6호
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• pp.270-282
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• 2013

본 연구의 목적은 다문화가정 아동의 이중문화특성 및 사회적 자본이 우울 및 자존감의 심리적 적응에 미치는 영향을 살펴보는 데 있다. 조사대상자는 서울 등 7개의 대도시지역의 어머니가 결혼이주여성인 초등학교 3~6학년, 중1~3학년 아동 305명, 그의 어머니 295명이다. 회귀분석 결과, 다문화가정 아동의 우울감에 영향을 미치는 요인을 살펴보면, 친구 지지가 낮을수록, 이용한 프로그램 수가 많을수록, 주관적 경제수준이 낮다고 생각할수록 우울감이 더 높게 나타났고, 이 중 친구 지지가 가장 강력한 요인으로 나타났다. 둘째, 자존감에 영향을 미치는 요인들을 살펴보면 친구지지가 가장 강력한 영향요인으로 나타났고 다음으로 어머니의 한국어 수준, 교사지지, 이용한 프로그램 수 등의 순으로 나타났다. 이러한 결과는 다문화가족 아동의 심리적응을 높이기 위한 개입 시 이중문화특성과 사회적 자본 특성을 고려해야 하며 특히 친구지지나 교사지지와 같은 사회적 자본 특성을 반영한 개입이 필요함을 보여준다.

• 정보과학회 논문지
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• 제42권7호
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• pp.889-900
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• 2015

최근 복잡해진 시스템의 실행 환경에서 발생하는 문제들을 해결하기 위해 자가적응형 시스템의 중요성이 대두되고 있다. 그러나 시스템 설계 시점에 구축된 모델과 실행 환경 사이의 불확실성이 시스템을 알 수 없는 상황으로 이끌 수 있기 때문에 이를 다루기 위한 연구가 중요한 이슈로 떠오르고 있다. 본 논문은 불확실한 상황에서 적응 시점을 결정하고 모델에 실시간 환경을 반영하기 위한 방법을 제안한다. 적합한 적응 시점을 위해 시스템의 이전 상태들과 현재상태를 비교하여 베이지안 서프라이즈를 계산하고, 설계된 모델에 실시간 환경을 수행된 적응 정책의 결과를 모델에 반영한다. 제안 방법론을 네비게이션 시스템에 적용하여 제안 사항의 유효성을 확인하였다.

• 한국시뮬레이션학회논문지
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• 제25권3호
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• pp.65-76
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• 2016

자가-적응 소프트웨어는 스스로 문제를 인지하여 인지한 문제에 대하여 소프트웨어 사이클이 멈추지 않고 해당 요구사항에 맞게 적응하는 소프트웨어이다. 본 논문에서는 임계점이 존재하는 시스템에서 발생하는 불필요한 적응 수행을 감소시키기 위하여 선행적 방식으로 임계점 이후의 상황을 예측함으로써 문제가 되는 이벤트를 사전에 처리하고자 한다. 실측치는 대부분 선형과 비선형이 모두 나타나기 때문에 하이브리드 모델을 사용하여 임계점 이후를 예측하며, 예측 기법의 사용 여부는 예측의 정확도를 기반으로 하는 적응 시점 판단 지표를 기준으로 한다. 본 논문의 기여점으로는 하이브리드 모델을 MAPE-K에 적용하여 임계점 이후 상황을 예측함으로써 실제 변화에 대한 불확실성을 감소시켰다는 점과 적응 시점 판단 지표를 기반으로 적응 시점을 판단함으로써 불필요한 적응 수행을 줄였다는 데에 있다.

• 인간식물환경학회지
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• 제23권2호
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• pp.245-254
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• 2020

Patients diagnosed with cancer face mental problems such as alienation, isolation, anxiety about death and fear, recovering from psychological difficulties. In this study, a forest healing program was provided for cancer patients to recover from psychological stress, depression, social isolation and self-esteem caused by cancer and changes in salivary cortisol through psychological and emotional recovery were measured. From September 19 to November 28, 2017, a forest healing program composed of a total of 10 sessions, two hours per session was provided for 12 cancer patients in the Forest of Taegyo located in Yongin. Psychological tests were performed with Social Adaptation Self-evaluation Scale (SASS), Korean-version Perceived Stress Scale (PSS) and Beck Depression Inventory (BDI) and the collected data were analyzed with the SPSS 18.0. The salivary cortisol level was measured along with the psychological tests and were analyzed by a specialized testing agency. The results of the analysis showed that the pre- and post-assessment score of SASS was 29.17 and 25.92, respectively, and that the pre- and post-assessment score of PSS was 30.50 and 23.92, respectively. The pre- and post-assessment score of BDI was 41.00 and 34.83, respectively, which showed significant differences. In addition, the pre- and post-assessment level of saliva cortisol was 3.13 and 1.68, respectively, showing a significant decrease. In short, the forest healing program was found to be effective in reducing physiological changes caused by social isolation and stress due to the emotional and psychological difficulties that the subjects who were diagnosed with cancer and were recovering from it have. In the future, it will be necessary to develop and implement a forest healing program by conducting a forest healing requirement survey on cancer patients.

• 기본간호학회지
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• 제7권3호
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• pp.429-440
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• 2000

The purpose of this study was to validate self care outcomes included Nursing Outcomes Classification(NOC) developed by Johnson and Maas at the University of Iowa. A sample of 103 nurse experts working in university affiliated hospitals participated in this study. They were asked to rate indicators that examplified the outcomes on a scale of 1(indicator is not at all characteristic) to 5(indicator is very characteristic). A questionnaire with an adaptation of Fehring's methodology was used to establish the content validity of outcomes. The results were as follows : 1. All indicators were considered to be 'supporting' and no indicators were considered to be 'nonsupporting'. 2. 'Self care: Toileting' attained an OCV score of 0.884 and was the highest OCV score among self care outcomes. 3. 'Self care: Oral Hygiene' attained an OCV score of 0.756 and was the lowest OCV score among self care outcomes. 4. 'Self-care: Activities of Daily Living (ADL)' attained an OCV score of 0.845 and the highest indicator was 'eating'. 5. 'Self-care: Bathing' attained an OCV score of 0.810 and the highest indicator was 'washes body'. 6. 'Self-care: Dressing' attained an OCV score of 0.831 and the highest indicator was 'buttons clothing'. 7. 'Self-care: Eating' attained an OCV score of 0.815 and the highest indicator was 'chews food'. 8. 'Self-care: Grooming' attained an OCV score of 0.833 and the highest indicator was 'combs or brushes hair'. 9. 'Self-care: Hygiene' attained an OCV score of 0.823 and the highest indicator was 'washes hands'. 10. 'Self-care: Insrumental Activities of Daily Living(IADL)' attained an OCV score of 0.776 and the highest indicator was 'uses telephones'. 11. 'Self-care: Non-Parenteral Medication' attained an OCV score of 0.796 and the highest indicator was 'identifies medication'. 12. 'Self-care: Parenteral Medication attained an OCV score of 0.810 and the highest indicator were 'identifies medication' and 'administers medication correctly'. More outcomes need to be validated and outcomes sensitive to Korean culture need to be developed.

• Restorative Dentistry and Endodontics
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• 제28권1호
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• pp.23-33
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• 2003

The purpose of this study was to compare in vitro interfacial relationship of restorations bonded with three self-etching primer adhesives and one self-etching adhesive. Class I cavity preparations were prepared on twenty extracted human molars. Prepared teeth were divided into four groups and restored with four adhesives and composites Clearfil SE $Bond/Clearfil^{TM}$ AP-X (SE), UniFil $Bond/UniFil^{\circledR}$ F (UF), FL $Bond/Filtek^{TM}$ Z 250 (FL) and Prompt $L-Pop/Filtek^{TM}$ Z 250 (LP) After storing in distilled water of room temperature for 24 hours, the specimens were vertically sectioned and decalcified. Morphological patterns between the enamel/dentin and adhesives were observed under SEM. The results of this study were as follows : 1. They showed close adaptation between enamel and SE, UF and FL except for LP. 2. The hybrid layer in dentin was $2{\;}\mu\textrm{m}$ thick in SE, $1.5{\;}\mu\textrm{m}$ thick in UF, and $0.4{\;}\mu\textrm{m}$ in both FL and LP. So, the hybrid layers of SE and UF were slightly thicker than that of FL and LP. 3. The lengths and diameters of resin tags in UF and FL were similar, but those of LP were slightly shorter and slenderer than those of SE. 4. The resin tags were long rod shape in SE, and funnel shape in other groups Within the limitations of this study, it was concluded that self-etching primer adhesives showed close adaptation on enamel. In addition, the thickness of hybrid layer ranged from $0.4-1.5{\;}\mu\textrm{m}$ between adhesives and dentin. The resin tags were long rod or funnel shape, and dimension of them was similar or different among adhesives.