• Nonlinear Functional Analysis and Applications
• /
• 제26권1호
• /
• pp.177-195
• /
• 2021

In this paper, we introduce the modification of a generalized (Ψ, L)-weak contraction and we prove some coincidence point results for self-mappings G, T and S, and some fixed point results for some maps by using a (c)-comparison function and a comparison function in the sense of a b-metric space.

• 한국지리정보학회지
• /
• 제25권1호
• /
• pp.56-76
• /
• 2022

본 연구는 커뮤니티 매핑 과정에 스마트기기로 수집된 공간분석 정보를 제공하고 공유하여 시민들이 자신의 의견을 객관적으로 검토할 수 있는 기회를 제공하고, 이러한 공간정보의 제공이 시민들의 의사결정과 인식에 어떤 영향을 미치는지를 살펴보았다. 연구를 위해 부산광역시 중구 영주동을 사례지역으로 선정하여 이 지역의 초등학생 보행안전 문제를 개선하기 위한 위험지역 선정을 목표로 커뮤니티 매핑을 진행하였다. 시민들은 자신들의 경험과 인식을 기반으로 1차 위험지도를 작성하고, 드론과 센서 등 스마트기기로 수집된 보행안전시설과 유동인구 공간정보를 공유한 후 2차 위험지도를 작성하였다. 1차, 2차 위험지도를 비교한 결과 많은 구간에서 순위 변동이 발생했으며, 참여주민들이 인식했던 것보다 객관적으로 측정된 유동인구가 많고 안전시설이 미비한 지역의 순위가 상향되었다. 또한, 주민 설문조사 결과를 살펴보면, 커뮤니티 매핑과정에서 스마트기기 기반 공간분석 정보의 제공은 시민들의 지역문제 인식에 도움을 주었을 뿐 아니라 본인들이 제출한 의견이 정책에 반영될 수 있을 것이라는 기대감도 증가시키는 것으로 나타났다. 또한 참여자들이 직접 만들어 낸 결과물에 대한 신뢰도 향상되어 주민 스스로 자신감과 믿음을 갖는데 도움을 주는 것으로 나타났다.

• 대한수학회보
• /
• 제37권3호
• /
• pp.461-475
• /
• 2000

In the present paper, we first give some examples of self-mappings which are asymptoticaly nonexpansive in the intermediate, not strictly hemicontractive, but satisfy the property (H). It is then shown that the modified Mann and Ishikawa iteration processes defined by $x_{n+1}=(1-\alpha_n)x_n+\alpha_nT^nx_n\ and\ x_{n+1}=(1-\alpha_n)x_n+\alpha_nT^n[(1-\beta_n)x_n+\beta_nT^nx_n]$,respectively, converges strongly to the unique fixed point of such a self-mapping in general Banach spaces.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.229-229
• /
• 2000

Conventional gain-tuning methods such as Ziegler-Nickels methods, have many disadvantages that optimal control ler gain should be tuned manually. In this paper, modified PID controllers which include self-tuning characteristics are proposed. Proposed controllers automatically tune the PID gains in on-1ine using neural networks. A new learning scheme was proposed for improving learning speed in neural networks and satisfying the real time condition. In this paper, using a nonlinear mapping capability of neural networks, we derive a tuning method of PID controller based on a Back propagation(BP)method of multilayered neural networks. Simulated and experimental results show that the proposed method can give the appropriate parameters of PID controller when it is implemented to DC Motor.

• 생태와환경
• /
• 제43권4호
• /
• pp.477-491
• /
• 2010

Benthic macroinvertebrates were collected two times from 116 sites at the $1^{st}{\sim}4^{th}$ order streams in forest areas in Gyungsang province in late spring and late summer. The sample sites belonged to slightly and moderately polluted states. When communities were classified by the Self-Organizing Map (SOM), the gradient was observed according to degree of pollution. Within clusters of slightly polluted sites, however, seasonality was further observed. Scrapers, gatherer-collectors, and filterer-collectors were abundantly observed in late spring while shredders appeared more in late summer. The number of predator species increased in late summer. Behavior types were mostly clingers in two seasons. Community compositions at the moderately polluted sites were not much differentiated in different seasons. Gatherer-collectors and burrowers were dominantly collected in both seasons.

• ETRI Journal
• /
• 제36권4호
• /
• pp.537-544
• /
• 2014

In this paper, we present a new inter-carrier interference (ICI) self-cancellation scheme - namely, ISC scheme - for orthogonal frequency-division multiplexing systems to reduce the ICI generated from phase noise (PHN) and residual frequency offset (RFO). The proposed scheme comprises a new ICI cancellation mapping (ICM) scheme at the transmitter and an appropriate method of combining the received signals at the receiver. In the proposed scheme, the transmitted signal is transformed into a real signal through the new ICM using the real property of the transmitted signal; the fast-varying PHN and RFO are estimated and compensated. Therefore, the ICI caused by fast-varying PHN and RFO is significantly suppressed. We also derive the carrier-to-interference power ratio (CIR) of the proposed scheme by using the symmetric conjugate property of the ICI weighting function and then compare it with those of conventional schemes. Through simulation results, we show that the proposed ISC scheme has a higher CIR and better bit error rate performance than the conventional schemes.

• Tribology and Lubricants
• /
• 제39권6호
• /
• pp.256-261
• /
• 2023

This study is conducted to evaluate the durability of superhydrophobic surfaces, with a focus on two aspects: contact angle measurement and self-cleaning-performance analysis. Superhydrophobic copper and aluminum surfaces are fabricated using the immersion method and subjected to a rolling wear test, in which a 2 kg weight is placed on a rolling tester, under loaded conditions. To evaluate their durability, the contact angles of the specimens are measured for each cycle. In addition, the surface deformation of the specimens before and after the test is analyzed through SEM imaging and EDS mapping. The degradation of the self-cleaning performance is evaluated before and after the wear test. The results show that superhydrophobic aluminum is approximately 4.5 times more durable than superhydrophobic copper; the copper and aluminum specimens could endure 21,000 and 4,300 cycles of wear, respectively. The results of the self-cleaning test demonstrate that superhydrophobic aluminum is superior to superhydrophobic copper. After the wear test, the self-cleaning rates of the copper and aluminum specimens decrease to 72.7% and 83.4%, respectively. The relatively minor decrease in the self-cleaning rate of the aluminum specimen, despite the large number of wear cycles, confirms that the superhydrophobic aluminum specimen is more durable than its copper counterpart. This study is expected to aid in evaluating the durability of superhydrophobic surfaces in the future owing to the advantage of performing wear tests on superhydrophobic surfaces without damaging the surface coating.

• Bulletin of the Korean Chemical Society
• /
• 제35권3호
• /
• pp.858-864
• /
• 2014

Recently, many researches have shown that even photosynthetic light-harvesting pigment-protein complexes can have quantum coherence in their excitonic energy transfer at cryogenic and physiological temperatures. Because the protein supplies such noisy environment around pigments that conventional wisdom expects very short lived quantum coherence, elucidating the mechanism and searching for an applicability of the coherence have become an interesting topic in both experiment and theory. We have previously studied the quantum coherence of a phycocyanin 645 complex in a marine algae harvesting light system, using Poisson mapping bracket equation (PBME). PBME is one of the applicable methods for solving quantum-classical Liouville equation, for following the dynamics of such pigment-protein complexes. However, it may suffer from many defects mostly from mapping quantum degrees of freedom into classical ones. To make improvements against such defects, benchmarking targets with more accurately described dynamics is highly needed. Here, we fall back to reduced hierarchical equation of motion (HEOM), for such a purpose. Even though HEOM is known to applicable only to simplified system that is coupled to a set of harmonic oscillators, it can provide ultimate accuracy within the regime of quantum-classical description, thus providing perfect benchmark targets for certain systems. We compare the evolution of the density matrix of pigment excited states by HEOM against the PBME results at physiological temperature, and observe more sophisticated changes of density matrix elements from HEOM. In PBME, the population of states with intermediate energies display only monotonically increasing behaviors. Most importantly, PBME suffers a serious issue of wrong population in the long time limit, likely generated by the zero-point energy leaking problem. Future prospects for developments are briefly discussed as a concluding remark.

• 보건교육건강증진학회지
• /
• 제27권4호
• /
• pp.165-175
• /
• 2010

Objectives: The purpose of this study is to evaluate the program theory of a lifestyle intervention program for the prevention and treatment of metabolic syndrome. Methods: The program evaluated is a tailored intervention for multiple health behavior associated with metabolic syndrome which is informed by theoretical constructs from the Intervention Mapping and Transtheoretical model. The program components include one-to-one health counseling, a self-management handbook, and a health diary. To evaluate program impact theory we examined the logic of program goals and objectives, intervention methods and strategies, and the theoretical constructs of program materials through document review and matrix building. Results: This evaluation has found that the intervention program applied social cognitive theory constructs to design intervention methods and strategies in addition to the Transtheoretical model: self-monitoring for goal setting and monitoring skill, outcome expectation for the benefits of health behavior change, and interaction with environment for observational learning through modeling. While the intervention addresses multiple determinants and behaviors, it is limited to an individual level and lacks social and environmental approaches. Following the Transtheoretical framework, the contents of the intervention materials were developed utilizing consciousness raising as a main strategy for earlier stages of change, and counterconditioning and stimulus control for later stages of change. Conclusion: Program theory evaluation can be a process of enhancing program validity. It would also be necessary for providing basis for efficient program implementation. When comparisons of program theory between similar programs are possible, program theory and validity will be strengthened when comparisons of program theories between similar programs are possible.

• 한국비블리아학회지
• /
• 제26권2호
• /
• pp.217-239
• /
• 2015

올바른 독서치료를 위해서 이용자는 자신의 상황과 증상에 대한 자가판단과 함께 치유서의 올바른 선정및 접근이 필요하다. 이용자는 독서치료 독서목록의 상황별 카테고리를 이용해서 치유서에 접근하지만, 독서치료를 원하는 이용자가 자신의 복잡한 상황 및 증상을 간략하게 정리하여 하나의 단어 혹은 키워드로 정의하는 것은 어렵다. 국내 독서치료 독서목록은 연령별 카테고리를 제외한 1개 혹은 최대 2개의 상황별 카테고리를 제공하며, 이로 치유서를 분류하고 있다. 이용자가 복잡한 상황을 가지고 카테고리에 접근하는 만큼, 이용자의 접근 효율성과 용이성을 높이기 위해서는 1개의 카테고리 보다는 복수의 카테고리 제공이 필요하다. 이에 본 연구에서는 독서치료를 원하는 이용자가 원하는 치유서에 보다 효율적으로 접근할 수 있도록, 기초 연구로서 국내의 독서치료 독서목록과 치유서의 관계에 대해 분석하였다. 국내 대표 독서치료 독서목록을 이용하여 카테고리간의 매핑과 크로스워크를 실시하였고, 독서치료 독서목록의 전반적인 조사를 통해서 국내 독서치료 독서목록 카테고리를 분석하였다.