• Journal of Gastric Cancer
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• 제16권1호
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• pp.14-20
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• 2016

Purpose: Early diagnosis of gastric cancer is still the exception in Western countries. In the East, as in Japan and Korea, this disease is an endemic disorder. More conservative surgical procedures are frequently performed in early gastric cancer cases in these countries where sentinel lymph node navigation surgery is becoming a safe option for some patients. This study aims to evaluate preliminary outcomes of patients with early gastric cancer who underwent sentinel node navigation surgeries in Brazil, a country with non-endemic gastric cancer levels. Materials and Methods: From September 2008 to March 2014, 14 out of 205 gastric cancer patients underwent sentinel lymph node navigation surgeries, which were performed using intraoperative, endoscopic, and peritumoral injection of patent blue dye. Results: Antrectomies with Billroth I gastroduodenostomies were performed in seven patients with distal tumors. The other seven patients underwent wedge resections. Sentinel basin resections were performed in four patients, and lymphadenectomies were extended to stations 7, 8, and 9 in the other 10. Two patients received false-negative results from sentinel node biopsies, and one of those patients had micrometastasis. There was one postoperative death from liver failure in a cirrhotic patient. Another cirrhotic patient died after two years without recurrence of gastric cancer, also from liver failure. All other patients were followed-up for 13 to 79 months with no evidence of recurrence. Conclusions: Sentinel lymph node navigation surgery appears to be a safe procedure in a country with non-endemic levels of gastric cancer.

• ETRI Journal
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• 제36권1호
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• pp.171-174
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• 2014

In weighted bit-flipping-based algorithms for low-density parity-check (LDPC) codes, due to the existence of overconfident incorrectly received bits, the metric values of the corresponding bits will always be wrong in the decoding process. Since these bits cannot be flipped, decoding failure results. To solve this problem, an improved parallel weighted bit flipping algorithm is proposed. Specifically, a reliability-saturation strategy is adopted to increase the flipping probability of the overconfident incorrectly received bits. Simulation results show that the error floor of LDPC codes is greatly lowered.

• 한국경영과학회지
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• 제35권3호
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• pp.1-24
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• 2010

As the Internet is explosively growing and the market is rapidly globalized, many entrepreneurs have been given an impetus to take on the function of the intermediation between providers and customers. Organizations performing the mediating roles in the cyberspace are termed 'cybermediary' and often called 'Openmarket' as a kind of transactional cybermediary in Korea. Despite sustainable growth of Openmarket, customer complaints and damages are increasing because of absence of recovery standards after a service failure. Therefore, it is important that a service provider converts dissatisfied customers to advocates for the growth of the Openmarket. This study aims to examine the role of recovery of the service failures for the Openmarket by proposing a relationship between complaint handling and continuance based on the equity theory. From the empirical results, we found that interactional equity had significant effects on both overall service satisfaction and recovery satisfaction, while procedural equity significantly influenced only recovery satisfaction. Recovery satisfaction also had an impact on overall service satisfaction and each satisfaction factor was positively related to continuance intention.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권2호
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• pp.71-80
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• 2009

This paper discusses the service life prediction methods for CFRP bar for concrete reinforcement using accelerated degradation tests. The relationship between performance degradation and the rate of a failure-causing chemical reaction is assumed for the temperature accelerated degradation tests. Methods of obtaining acceleration factors and predicting service life of the CFRP bar using the degradation model are presented.

• 한국도서관정보학회지
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• 제34권2호
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• pp.79-94
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• 2003

본 연구는 행정서비스의 민간위탁과 관련하여 공공도서관의 민간위탁에 대한 당위성을 찾으려는 의도에서 시작된 것이다. 연구의 진행을 위해 국내 특정 지방정부에서 실시한 행정사무의 민간위탁 사업에 대한 종합적인 평가결과와 민간위탁으로 운영중인 지방공공도서관에 대한 경영평가를 활용하였다. 연구의 결과, 기 시행중인 행정서비스의 주민만족도 저하를 비롯하여 도서관서비스의 특성상 공공도서관에 대한 민간위탁 계획은 그 시행에서 많은 한계가 있을 것으로 판단된다.

• 한국생활과학회지
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• 제14권6호
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• pp.915-924
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• 2005

In this study, two controversial Child Care Policies will be discussed based on the perspective of Economics: Accreditation of Child Care Centers and Liberation of Child Care Service Tuition. Liberation of Child Care Service Tuition is to provide parents and children with exact quality which they want at a differentiated price. Accreditation of Child Care Center is to enhance the quality of child care service by evaluating the quality of centers and grading centers into three classes. This study concludes that success or failure of the policies mostly depend on the investment capability of the government to increase the supply of child care centers. Employing these two policies requires the child care rate more than certain level and more financial investment from the government since the responsibility of providing child care services relies mostly on the government in Korea.

• KCI Concrete Journal
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• 제11권3호
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• pp.53-64
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• 1999

A theory is proposed to predict the response of the load-deformation relationship of the reinforced concrete structures under the service state after cracking. The crack direction and concrete strains through the loading history before failure can be estimated by this theory based on the rotating crack model, which considers equilibrium, compatibility conditions, and average stress-strain relationship. The proposed crack direction and deformation show good agreement with test results under service state. The behavior of a variety of concrete structures, such as shear walls, deep beams and the web of box girders, can be predicted by this proposed theory under service state.

• 한국IT서비스학회지
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• 제7권1호
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• pp.45-62
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• 2008

This review examines the rapid growth of qualitative and quantitative of telecommunication industry for past couple of years from customer's viewpoint. Most of the telecommunication products were positioned in the market by the businesses and government's support, but the entity of telecommunication products were never interpreted from the user's viewpoint. Even though, various kinds of telecommunication services have been actively discussed by businesses, government, and IT professionals, it has not been sufficiently discussed by the marketing academia where they need to focus a lot on customer's utility. For the purpose of providing an insight of the telecommunication service marketing strategy, this study looked over old and new directions of growth, failure and evolution of services by focusing on two main pillar of communication business, which is high-speed internet and mobile phone service. Additionally, the research explains and mentions the limit and trend of the telecommunication service marketing, and the future research task that needs to be solved.

• ETRI Journal
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• 제41권2호
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• pp.207-223
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• 2019

Network function virtualization can significantly improve the flexibility and effectiveness of network appliances via a mapping process called service function chaining. However, the failure of any single virtualized network function causes the breakdown of the entire chain, which results in resource wastage, delays, and significant data loss. Redundancy can be used to protect network appliances; however, when failures occur, it may significantly degrade network efficiency. In addition, it is difficult to efficiently map the primary and backups to optimize the management cost and service reliability without violating the capacity, delay, and reliability constraints, which is referred to as the reliability-aware service chaining mapping problem. In this paper, a mixed integer linear programming formulation is provided to address this problem along with a novel online algorithm that adopts the joint protection redundancy model and novel backup selection scheme. The results show that the proposed algorithm can significantly improve the request acceptance ratio and reduce the consumption of physical resources compared to existing backup algorithms.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.151-158
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• 2018

As the competition of 21 cyber universities in Korea has been on a continual increase, they are focusing on improving the quality of the e-learning education in cyber universities. In this study, we intended to derive the failure factors of the previous chatting system in the 2010s and the success factors from previous studies. Next, we identified priorities among five factors(Reliability, UI Convenience, Usability, Network effect, Operational policy) using AHP and the practical ways to implement the chatting service. We applied the chatting system to all the curriculums of S cyber university. Our study finds that the chat service affects the satisfaction of education. Finally, we propose the utilization plan to improve the e-learning education of cyber university through the findings of this research.