• ETRI Journal
• /
• v.29 no.5
• /
• pp.633-640
• /
• 2007

We report an experimental demonstration of 40 Gbps all-optical 3R regeneration with all-optical clock recovery based on InP semiconductor devices. We also obtain alloptical non-return-to-zero to return-to-zero (NRZ-to-RZ) format conversion using the recovered clock signal at 10 Gbps and 40 Gbps. It leads to a good performance using a Mach-Zehnder interferometric wavelength converter and a self-pulsating laser diode (LD). The self-pulsating LD serves a recovered clock, which has an rms timing jitter as low as sub-picosecond. In the case of 3R regeneration of RZ data, we achieve a 1.0 dB power penalty at $10^{-9}$ BER after demultiplexing 40 Gbps to 10 Gbps with an eletroabsorption modulator. The regenerated 3R data shows stable error-free operation with no BER floor for all channels. The combination of these functional devices provides all-optical 3R regeneration with NRZ-to-RZ conversion.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2012.05a
• /
• pp.643-643
• /
• 2012

Increasing energy prices and growing concerns about global warming address the need to improve energy self-sufficiency in many industrial and municipal sectors. Wastewater treatment plants (WWTPs) are representative of energy-consuming facilities in Korea, accounting for 5% of national energy consumption. We present renewable energy technologies and energy self-sufficiency scenarios in a municipal WWTP ($30,000m^3d^{-1}$) located in Yongin, South Korea. By employing photovoltaics (PV, 135 kW), small hydropower turbine (10 kW), and thermal energy from treated effluent (25 RT: refrigeration ton) within the WWTP, a total of 142 tonne of oil equivalent (toe) of energy was estimated to be generated, accounting for $365ton\;CO_2\;yr^{-1}$ of greenhouse gas emission reduction. Core renewable technologies under consideration include 1) hybrid solar PV system consisting of fixed PV, dual-axis PV, and building integrated PV, 2) low-head small hydropower plant specifically designed for treated effluent, 3) effluent heat recovery system for heating and air conditioning. In addition to these core technologies, smart operation and management scheme will be presented for enhancing overall energy savings and distribution within the WWTP.

• Journal of Power Electronics
• /
• v.15 no.5
• /
• pp.1305-1317
• /
• 2015

Distributed generation systems (DGSs) have been getting more and more attention in terms of renewable energy use and new generation technologies in the past decades. The self-excited induction generator (SEIG) occupies an important role in the area of energy conversion due to its low cost, robustness and simple control. Unlike synchronous generators, the SEIG has to absorb capacitive reactive power from the outer device aiming to stabilize the terminal voltage at load changes. This paper presents a novel static VAR compensator (SVC) called a magnetic energy recovery switch (MERS) to serve as a voltage controller in SEIG powered DGSs. In addition, many small scale SEIGs, instead of a single large one, are applied and devoted to promote the generation efficiency. To begin with, an expandable mathematic model based on a d-q equivalent circuit is created for parallel SEIGs. The control method of the MERS is further improved with the objective of broadening its operating range and restraining current harmonics by parameter optimization. A hybrid control strategy is developed by taking both of the stand-alone and grid-connected modes into consideration. Then simulation and experiments are carried out in the case of single and double SEIG(s) generation. Finally, the measurement results verify that the proposed DGS with SVC-MERS achieves a better stability and higher feasibility. The major advantages of the mentioned variable reactive power supplier, when compared to the STATCOM, include the adoption of a small DC capacitor, line frequency switching, simple control and less loss.

• Journal of muscle and joint health
• /
• v.3 no.2
• /
• pp.216-228
• /
• 1996

This study has purpose to perform leaving the hospital nursing plan during hospital treatment of patient with the knee ligament Injury on the basis of the concerns between the time of leaving the hospital after 2 weeks in hospital and the concerns through practical life after leaving the hospital systematically. This study is also tried to make exercise plan to prevent atrophy of Quardriceps muscle of the thigh caused by the limitation of activities. The subjects of study are 12 people who were in the hospital in affiliation to a university in Seoul, were operated on the knee ligament, and were discharged from the hospital within 2 weeks. Data collection time was for about 4 months from December, 94 to March, 95. Research method was performed 2 times by unorganized open questions. The collection of first data is through direct interview about the concerns before leaving the hospital, and secondary data is through direct interview about the concerns by practical life and experiences after leaving the hospital. The data was categorized by classifying several common elements among similar contents according to data by the situational analysis of Giorgi. The result of this study is as follows : 1) The concerns before leaving the hospital are like that the concerns of recovery possibility, the limitation of activities, the grim realities of life, the lack of confidence about self-nursing, the eyes of the surroundings, the burden to the others, and so on. 2) The concerns after leaving the hospital are like that the demands of the inconvenience by the limitation of self-nursing, the support about self-nursing by the difficulties of performing treatment order, the support of physical activities limitation by physical tiredness and the limitation of social activities, the support of information by the necessities of education in using crutches before leaving the hospital and continuing informational needs, psychological and mental support of normal physical recovery by the worries of physical recovery and physical change, and social support by thankfulness for his family and relatives. I suggest to make more systematic leaving the hospital nursing plan and exercise education plan for nursing plan after leaving the hospital of the patients with the knee ligament injury on the basis of this content.

• Journal of Korean Academy of Nursing
• /
• v.31 no.6
• /
• pp.1044-1054
• /
• 2001

The purpose of this study was to develop on east-west nursing intervention program. This study was conducted to identify the effectiveness of using facial meridian points for massage nursing intervention on the recovery of facial paralysis for 46 patients (22 for experimental group). All had suffered from strokes, and were also admitted to the division of oriental medicine in K University Hospital. Method: Data was collected from February 1st to December 31st of 2000. This study used a quasi experimental, non-equivalent control group pre-test and post-test design. The recovery of facial paralysis was measured by the difference between left and right facial length, observation and self report on a seven point scale, and facial discomfort by a facial scale after 6-7 facial massages in a two week period. Data was analyzed using the SPSS package program with x2 and t test. Result: The result of this study are as follows; The experimental group who received the facial meridian massage showed higher scores in recovery of facial paralysis (t=2.72, p=.009), and a smaller difference between left and right facial strength than those in control group (t=2.26, p= .29). The discomfort of the facial area in the experimental and control group showed no significant differences. Conclusion: These findings indicate that a facial meridian points massage could be an effective nursing intervention to the recovery of facial paralysis. This study contributes in developing an east-west nursing intervention with the oriental meridian theory and western massage therapy.

• Korea Journal of Hospital Management
• /
• v.14 no.1
• /
• pp.99-122
• /
• 2009

In this study, the authors developed typologies of failures and recovery strategies in healthcare services, adopting the research framework of Kelley et al.(1993), Hoffman, et al.(1995), and Forbes et al.(2005). Data were collected form a sample of 559 respondents recruited in several regions of Korea through self-administered questionnaires. Data collection was done at hospitals and clinics respondents were visiting. The study has identified typologies of 21 failures and 10 recovery strategies in health care services. Results shows that "insufficient explanation by doctors" was the most frequent service failure followed by "insincere attitude of administrative employees" and "insincere attitude of nurses. "The type of recovery (compensation) that most of the respondents have received was apology from the healthcare service providers while the recovery that most respondents wanted to receive was sufficient explanation, suggesting that there is a significant gap between what is wanted and what is offered. Implications for healthcare service providers as well as limitations of the current study were discussed. Directions for further research were also suggested.

• Journal of Oriental Neuropsychiatry
• /
• v.25 no.4
• /
• pp.359-370
• /
• 2014

Objectives: To describe the progress and influencing factors of Hwa-byung. Methods: Data were collected from semi-structured interviews. The progress of and recovery from Hwa-byung were examined using the collected experiences of eight middle-aged women who suffered from Hwa-byung. For analysis of the data collected, a Consensual Qualitative Research (CQR) methodology was used. Results: Of the eight participants who thought they had Hwa-byung, six were actually Hwa-byung patients and two were non-Hwa-byung patients. Four years later, four of the six Hwa-byung patients recovered, while the Hwa-byung of one patient persisted, and the remaining patient had circular Hwa-byung. Over time, the symptoms of Hwa-byung declined substantially. However, the patients recognized that their disease continuously persisted. Moreover, they thought their symptoms had worsened. Many types of changes were observed during the recovery period, including environmental, physical, cognitive, and emotional changes, as well as changes in attitudes toward others. Recovery factors included the reduction of stimuli, social support, exercise, treatment, control of rumination, and some cognitive changes. Conclusions: To recover from Hwa-byung, it is necessary for patients to experience changes in environment, cognition, and emotion, and to employ self-management in everyday life.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.25 no.4
• /
• pp.240-249
• /
• 2018

Purpose: The study was done to explore whether the duration of perioperative prophylactic antibiotics therapy influenced uncertainty of recovery in patients with elective laparoscopic uterine myomectomy. Methods: A prospective study was conducted using self-report questionnaires and electrical medical records for patients with uterine myomectomy. According to the length of the perioperative prophylactic antibiotics therapy, the patients were divided into three groups: single-dose antibiotic treatment group, short-term antibiotic treatment group, and long-term antibiotic treatment group. Data were collected from December 20, 2016 to July 31, 2017 from 161 patients who underwent laparoscopic myomectomy at a metropolitan city general hospital. Results: Level of uncertainty of recovery was $2.98{\pm}0.22$. The uncertainty was highest in the long-term antibiotic treatment group, followed by the short-term antibiotic treatment group and the single-dose antibiotic treatment group (F=89.40, p<.001). In the regression analysis, factors influencing uncertainty of recovery among uterine myomectomy patients were duration of perioperative prophylactic antibiotic therapy (${\beta}=.70$, p<.001) and duration of NPO (${\beta}=-.11$, p=.047) which explained 51.5% of the variance (F=83.75, p<.001). Conclusion: Based on these results, information including the administration of antibiotics before surgery should be provided to the patients to help reduce the uncertainty of postoperative recovery.

• Safety and Health at Work
• /
• v.6 no.3
• /
• pp.240-248
• /
• 2015

Background: Recovery from fatigue is important in maintaining night workers' health. This study compared the course of self-reported recovery after 2-week 12-hour schedules consisting of either night shifts or swing shifts (i.e., 7 night shifts followed by 7 day shifts) to such schedules consisting of only day work. Methods: Sixty-one male offshore employees-20 night workers, 16 swing shift workers, and 25 day workers-rated six questions on fatigue (sleep quality, feeling rested, physical and mental fatigue, and energy levels; scale 1-11) for 14 days after an offshore tour. After the two night-work schedules, differences on the $1^{st}$ day (main effects) and differences during the follow-up (interaction effects) were compared to day work with generalized estimating equations analysis. Results: After adjustment for confounders, significant main effects were found for sleep quality for night workers (1.41, 95% confidence interval 1.05-1.89) and swing shift workers (1.42, 95% confidence interval 1.03-1.94) when compared to day workers; their interaction terms were not statistically significant. For the remaining fatigue outcomes, no statistically significant main or interaction effects were found. Conclusion: After 2-week 12-hour night and swing shifts, only the course for sleep quality differed from that of day work. Sleep quality was poorer for night and swing shift workers on the $1^{st}$ day off and remained poorer for the 14-day follow-up. This showed that while working at night had no effect on feeling rested, tiredness, and energy levels, it had a relatively long-lasting effect on sleep quality.

• 모자간호학회지
• /
• v.3 no.1
• /
• pp.64-77
• /
• 1993

Recovery of functional status and affecting factors it were examined at 1 and 2 months after delivery in 111 women who defined as the resumption of household, self-care, social & community, and occupational activities, and assumption of infant care responsibilities. The data were collected by Tulman & Fawcett (1988)'s IFSAC questionnaire at 2 local hospitals & health center in Kwangju city & Chonnam province. The results were as follows : 1. Total mean scores of functional status were 2.3 points and increased in total functional status between 1 & 2 months after childbirth. The analysis revealed significant changes in 3 dimensions-household, social & community, and occupational activities-of IFSAC between 1 & 2 months after childbirth. 2. Mean scores of 5 dimensions of IFSAC were : self-care activities, 1.9 points : household activities, 2.7 points ; infant care responsibilities, 3.6 points ; occupational activities, 1.5 points ; and social & community activities, 1.6 points. 3. The job affected significantly the household, occupational activities and infant care responsibilities. And the complication of infant or mother affected significantly the infant care responsibilities in association with recovery functional status. Based on the findings and a review of the literature in regard to our understanding of recovery of functional status, the following recommendations were derived. 1. Future research needs to be policied concerning length of maternity leave after delivery on a firmer basis throught longitudinal study. 2. The data also nay be used to develop individual interventions to facilitate recovery from childbirth. 3. The IFSAC may be used to clinical assessments of functional status in the case of women cancer or obstetric and gynecologic operation.