:The energy consumption of a condensing gas boiler may be greatly reduced by the effective operation of the unit. In this study, the supply water algorithm for a condensing gas boiler control was developed by using the fuzzy logic. This includes the supply water set tempe-rature algorithm, and the control algorithms of a gas valve, a blower and a pump. For the set temperature algorithm, the outside air temperature and the return water temperature were used as input variables. The supply water temperature difference and its slope were used as input variables of the gas valve and blower control algorithm. And the supply water temperature and the return water temperature were used as input variables of the pump control algorithm. In order to analyse performances of these algorithms, the dynamic model of a condensing gas boiler was used. The initial start-up test, the supply water set temperature change test, the outside air tem-perature change test, and the return water temperature change test were performed. Simulation results showed that algorithms developed in this study may be practically applied for the effective control of a condensing gas boiler.Keywords:Condensing gas boiler(콘덴싱가스보일러), Supply water algorithm(공급수알고리즘), Set algorithm(설정알고리즘), Control algorithm(제어알고리즘), Fuzzy logic(퍼지로 직), Dynamic model(동적모델)

/pdf/the-supply-water-algorithm-for-a-condensing-gas-boiler-3owpxjmbyu.pdf

The Supply Water Algorithm for a Condensing Gas Boiler Control

While there is an evolving literature on the benefits of texting and patient-centered technologies, texting initiatives have not focused on family members. We sought to identify patients’ family members’ perspectives on facilitators and barriers to using 1 digital texting innovation to promote family-centered care during patients’ hospitalizations. This qualitative study was conducted at a tertiary care center in Houston, consisting of 7 hospitals (1 academic hospital and 6 community hospitals), involving analyzation of 3137 comments from family members who used the digital texting technology. Thematic analysis methods were used. The data analysis for loved ones’ feedback resulted in 4 themes as facilitators: (1) inpatient text messaging keeps loved ones updated and connected (n = 611); (2) inpatient text messaging allows for stronger continuity of communication (n = 69); (3) messaging promotes a sense of staff compassion and service (n = 245); and (4) messaging reduces phone calls (n = 65). The data analysis resulted in 4 themes as barriers to text messaging helpfulness: (1) messages could feel generic (n = 31); (2) inpatient texting was not needed if all loved ones were regularly at bedside (n = 6); (3) messages could have a perceived delay (n = 37); and (4) security features could impact convenience (n = 29). Our findings indicate that family members and loved ones value inpatient text messages, not only for the information the messages provide, but also because the act of writing text messages and preparing loved ones shows inclusiveness, compassion, and family-centered care.

Design and Integration of a Texting Tool to Keep Patients’ Family Members Updated During Hospitalization: Family Members’ Perspectives

Abstract—Design of membership function ranges in fuzzy logic control (FLC) is presented for robust control of a variable speed refrigeration system (VSRS). The criterion values of the membership function ranges can be carried out from the static experimental data, and two different values are offered to compare control performance. Some simulations and real experiments for the VSRS were conducted to verify the validity of the designed membership functions. The experimental results showed good agreement with the simulation results, and the error change rate and its sampling time strongly affected the control performance at transient state of the VSRS.

/pdf/design-of-membership-ranges-for-fuzzy-logic-control-of-wesqdjvwg9.pdf

Design of Membership Ranges for Fuzzy Logic Control of Refrigeration Cycle Driven by a Variable Speed Compressor

In order to control multi-zone temperatures, a multi-type air-conditioning system may be used. In this study, control algorithms for the compressor and the electronic expansion valve of a multi-type air-conditioning system were developed by using fuzzy logics. The compressor control algorithm was composed of a compressor pressure setpoint algorithm, a compressor pressure setpoint reset algorithm, and a compressor frequency setpoint algorithm. The electronic expansion valve control algorithm was composed of an indoor temperature control algorithm, and a superheat control algorithm. These algorithms were applied to a multi-type air-conditioning system. Test showed good results for the control of a multi-type air-conditioning system.

Fuzzy Control Algorithms for the Compressor and the Electronic Expansion Valve of a Multi-type Air-conditioning System using Multiple Input Variables


 Background The use of mobile health (mHealth) technologies has dramatically increased in the past year. A critical component in the discussion about telehealth and mHealth technologies is the importance of integrating the voices of patients, caregivers, and their clinicians.
 Methods This study was performed at a tertiary center in Houston consisting of 7 hospitals (1 academic and 6 community hospitals). The clinically integrated mHealth technology consisted of a mHealth education and monitoring platform that used patient-centered emails and text messages over a 50-day period, from prior to the orthopaedic total joint replacement surgery to posthospital discharge to provide education and health monitoring at home. Study participants included patients who were scheduled for total joint replacement surgery between July 2018 and November 2019, and their caregivers. The study involved two components: (1) focus group study (n = 15); split into two groups of participants who had not used the mHealth technology (α-testing during the design phase, prior to implementation); and (2) a content analysis of 377 free-text comments from patients who used the mHealth technology, and who responded to questions about their use of the mHealth platform (β-testing; after implementation, during the execution phase). Thematic analyses methods were used.
 Results Three key themes emerged during the design phase including: (1) monitoring, bidirectional questions asking patients to respond to a question can feel invasive and/or annoying unless framed in a reciprocal, contextual-based way; (2) text messages should be used selectively for time-sensitive, critical information; and (3) information should be contained within the body of the message. Three themes emerged during the execution phase include: (1) the content should be divided into small, digestible chunks at the times that patients need that information; (2) the tone of the messages should be approachable and friendly, as opposed to detached and professional; and (3) mHealth technologies make patients calmer and more confident and less inclined to draw on hospital personnel, enabling patients to be managed by the automated program without escalating to human care. Limited, bidirectional engagement can foster interactivity and patient monitoring without becoming excessive or burdensome to health care professionals.
 Conclusion The use of mHealth for patient care is likely to be more effective and used in this multihospital mHealth technology study of patients undergoing orthopaedic surgery, if they are clinically integrated with staff who can respond to escalated problems as needed, to enable better adoption, uptake, and sustainability of technology.

Design and Integration of Mobile Health Technology in the Treatment of Orthopaedic Surgery: A Qualitative Study

The simulation program which can predict major performances of the multi-type heat pump system was developed. In order to verify the simulation program, several experimental tests were performed under various recommended conditions. The experimental results show in good agreement with simulation results. The verified simulation program was used to analyze the system performance. The capacities and the COP's under the various indoor and outdoor conditions were predicted. Therefore, it may be concluded that the system simulation program developed in this study may be effectively used for the system design and the performance prediction of the multi-type heat pump system.

Simulation Program Verification and Performance Prediction of the Multi - type Heat Pump System

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Fuzzy Control Algorithms for the Compressor and the Electronic Expansion Valve of a Multi-type Air-conditioning System using Multiple Input Variables

Design and Integration of Mobile Health Technology in the Treatment of Orthopaedic Surgery: A Qualitative Study

Simulation Program Verification and Performance Prediction of the Multi - type Heat Pump System