• Journal of Communications and Networks
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• 제9권3호
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• pp.236-246
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• 2007

This paper investigates the performance of the transmission control protocol (TCP) transport protocol over IEEE 802.11 infrastructure based wireless networks. A wireless link is generally characterized by high transmission errors, random interference and a varying latency. The erratic packet losses usually lead to a curbing of the flow of segments on the TCP connection and thus limit TCP's performance. This paper examines the impact of the lossy nature of IEEE 802.11 wireless networks on the TCP performance and proposes a scheme to improve the performance of TCP over wireless links. A negative acknowledgment scheme, selective negative acknowledgment (SNACK), is applied on TCP over wireless networks and a series of ns-2 simulations are performed to compare its performance against that of other TCP schemes. The simulation results confirm that SNACK and its proposed enhancement SNACK-S, which incorporates a bandwidth estimation model at the sender, outperform conventional TCP implementations in 802.11 wireless networks.

• 한국통신학회논문지
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• 제33권11B호
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• pp.989-997
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• 2008

The reverse acknowledgment (RA) scheme supports a fast loss recovery for negative acknowledgment (NAK)-based selective repeat automatic repeat request (SR-ARQ) by detecting a retransmission failure quickly before a retransmission timer expires. In this paper, we evaluate the performance of a NAK-based SR-ARQ protocol with the RA scheme and compare it with the conventional NAK-based SR-ARQ protocol. Particularly, we propose a simple analysis model for the transport delay of the NAK-based SR-ARQ protocol considering the traffic condition, the retransmission persistence, the timer-based retransmissions and the RA scheme's behavior. Both NAK-based SR-ARQ protocols with and without the RA scheme are implemented by using the OPNET simulator. We verified the analysis model's accuracy through the simulation results. Also, we evaluate the performance of the NAK-based SR-ARQ protocol with the RA scheme based on analysis and simulation results.

• 한국병원경영학회지
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• 제16권4호
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• pp.67-84
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• 2011

The open Hospital Attending Physician System has been discussed and operated for developing the efficiency and the substitutes for an increase in medical expenses, for overlapping investment in medical resources, and for normalization of medical delivery system. This study assessed the related factors to the acceptance and introduction of Attending Physicians on ophthalmologist. Data was collected mail response to 179 ophthalmologists in 2005. Applying multilevel logistic regression, we examined the relationship between their acknowledgment, attitude and acceptance of the open Hospital Attending Physicians System. The percentage of participation in Hospital Attending was indicated to be 3.9%. The 44.7% of all participants agreed to adopting the Hospital Attending, 33.5% of doctors are willing to participate in the future. The positive and normal attitude of physician toward the Hospital Attending is 6.6 times (95%CI 1.315, 33.138) and 55.2 times(95%CI 11.352, 268.347) more than that of negative after adjustment for other variables. Attitude was found to be the important factor influencing physicians' participation in the Attending Hospital. Thus, it is need to development and implication for the strategies that lead the practical necessity and positive attitude toward the Attending Hospital.

• 산경연구논집
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• 제12권12호
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• pp.25-33
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• 2021

Purpose: This paper estimates the impact of the epidemic crisis on election outcomes through investigating the effect of Covid19 crisis on election results of 21st General Election held in April 15th 2020 in Korea. Research design, data and methodology: This study employs Ordinary Least Square (OLS) method using district-level data from Seoul and Gyeonggi province available at National election data in Korea. Results: Despite the current crisis in Korea, Covid-19 has had positive effects on voter turnout on average, after controlling for other factors. On the other hand, the effect of Covid-19 on the voter turnout was negative in districts with a larger aging population and higher health insurance premiums. In addition, Covid-19 negatively impacted vote shares for the incumbent party, while its rival party saw gains in their votes. Conclusion: The effect of Covid-19 election outcomes in Korea is distinct from other countries due to the nationwide acknowledgment of the Korean government's achievement in managing the epidemic. This implies that the crisis management ability of a government is crucial in gaining support for an incumbent party in future elections. Countries facing upcoming elections need to implement acceptable Covid-19 restriction policies as well as economic support for compensation to reap similar benefits.

• 동아시아경상학회지
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• 제9권4호
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• pp.81-92
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• 2021

Purpose - Work stress environment is expanding alongside the speed of worldwide change and psychological well-being concerns are coming about because pressure over-burden can bring about lost workdays, lower representative usefulness, and high occupation turnover rates. For this reason, this study investigates to provide how practitioners can manage employee work stress using health psychology based on prior studies. Research design, Data, and methodology - Qualitative textual research involves collecting and analyzing various non-numeric data to establish different concepts or opinions in prior literature. That means that the present researcher carried out qualitative research in multiple ways, investigating many kinds of previous textual data, such as prior published peer-reviewed resources and case studies analysis. Result - The results revealed that directed symbolism has been displayed to improve prosperity and tranquility among employees with an assortment of persistent infections. Like diaphragmatic breathing, reflection practices consolidate zeroing in on a particular article or sensation (like breathing) while at the same time separating from other distracters and controlling inward encounters (for example, feelings, musings) through non-critical acknowledgment. Conclusion - This research proposes that intellectual rebuilding or figuring out how to perceive maladaptive musings and change them to reflect more versatile; judicious idea examples can fundamentally further develop temperament, diminish pressure, and reduction negative feelings for employees.

• 한국콘텐츠학회논문지
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• 제17권7호
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• pp.222-235
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• 2017

본 연구의 목적은 묵(MOOCs)에 대한 한국 대학교육 전문가들의 인식을 살펴보고, K-MOOC의 발전방향을 모색하는 것이다. 이를 살펴보기 위해 한국 대학교육 전문가 64명을 대상으로 묵(MOOCs)의 교육적 목표와 그 활용에 관한 미시적 쟁점과 거시적 쟁점에 대한 인식 조사를 실시하였다. 연구 결과, 한국대학교육 전문가들은 묵(MOOCs)의 교육적 목표를 교육 방법의 혁신으로 인식하고 있었다. 또한 묵(MOOCs) 이수증 발급이 학위 제도의 혼란을 야기할 것이라는 데에는 대체로 부정적인 인식을 나타냈는데, 이는 묵(MOOCs)을 보완재로서 인식하는 경향이 커졌기 때문인 것으로 해석된다. 거시적인 차원에서는 전반적으로 K-MOOC에 대해 부정적인 전망을 보이고 있었다. 그러나 K-MOOC의 파괴성을 높게 인식하고 있었기 때문에 묵(MOOCs)의 활용 가능성에 대해 논의해 볼 필요가 있다고 보여 진다. 이에 따라 K-MOOC 활용을 위한 제도적 정비와 대학 간 공동 개발의 가능성을 제언하였다.

• 대한간호학회지
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• 제28권2호
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• pp.369-379
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• 1998

Despite acknowledgment that pain is likely to be a major problem for many older adults, it is difficult to estimate the frequency of pain problems for this population. The main purpose of this study was to identify the various characteristics of chronic pain in the elderly by gender. It examines by gender, pain frequency, pain intensity, number of chronic pain sites, localization of pain, impact on activities, methods of pain management, and effects of chronic pain management. The subjects were 189 elderly people(65 years and older) living in an urban area. They were surveyed at their homes. They were surveyed by interview using a closed-ended questionnaire. The survey was done from Nov. 6th. to Dec. 6th. 1997. Descriptive statistics were used to determine all of the reported pain variables. Chi-square tests were used to determine crude differences between pain intensity and gender. T-test was used to determine differences in number of pain sites between men and women. The findings are as follows ; Of the 189 subjects, 83.6% reported experiencing pain, and men reported a lower prevalence (69.5%) than women(89.2%). Women had significantly more severe pain than did men(p=.001). Lower back pain(20.2%) and leg pain(20.2%) were the most prevalent, followed by knee pain(17.4%), arm pain(13.3%), neck and shoulder pain(11.6%), and headache(9.9%). Women experienced more multiple localizations of pain(p=.0001), the greatest impact was on movement (83.5%) , followed by usual activities(60.8%), sleep(49.4%), visiting(29.1%), and hobbies and recreations(50.0%). No differences were observed between men and women in the proportion of subjects reporting a negative impact on each of these activities. The methods of pain management were hospital visit(70.9%), drug store medication(46.7%), oriental medicine clinic(32.9%), endurance(13.3%), self-management(6.3%). Drug therapy was the most effective pain management strategy(94%), followed by physical therapy(63%) and accupuncture.byssocausis(55%). The conclusion : Pain is a symptom of great clinical importance that is often associated with disability, loss of independence, and reduced quality of life. In this study chronic pain symptoms were common but unevenly distributed in men and women. The results further advance understanding of the experience and impact of pain by gender. Future studies should incorporate questions that gather systemic and more detailed information on the characteristics of pain, especially by gender and by age.

• 한국보육지원학회지
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• 제11권4호
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• pp.211-237
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• 2015

본 연구는 예비유아교사의 동성애에 대한 이미지 유형과 그 특성을 Q-방법으로 분석하였다. 이를 위해 3, 4학년의 예비유아교사 180명을 대상으로 동성애에 대한 브레인스토밍을 실시하여 Q-모집단을 마련하였다. 그 중 40개의 진술문을 추출하여 Q-표본을 만들고, 45명의 예비유아교사들에게 진술문의 동의수준을 9단계로 분류하도록 하여, 그 결과를 QUANL 프로그램으로 분석하였다. 연구결과, 예비유아교사의 동성애에 대한 인식유형은 4가지로 분류되었으며, 각 유형 '존중형-동성을 사랑하는 보통 사람', '인정형-시선이 집중되는 독특한 사람', '관계부정형-나와 다른 자아를 타고난 사랑', '극단적 부정형-존중받지 못하는 혐오스런 사람'로 명명되었다. 본 연구를 통해 동성애에 대한 예비유아교사의 인식과 그 특성을 구체적으로 파악하여 동성애에 대한 인식론적 지배담론이 예비유아교사들의 신념에서 어떻게 투영되고 있는지를 살펴보고 이를 토대로 유아 다문화교육에서 침묵된(silenced)부분인 성에 대한 교육-실천적 시사점을 얻고자 하였다. 동성애에 대한 교육자의 시각을 점검해보고 한국사회의 동성애에 대한 문화적 이해수준을 파악하는 것은 향후 유아교육에서의 다문화 교육방향을 정립하는데 도움이 될 것으로 생각한다.