• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.49 no.6
• /
• pp.497-504
• /
• 2021

This paper presents improvement of the reception noise suppression method during formation flights of aircraft. Since aircraft communication equipment is very important for flight mission and safety to perform the functions of internal/external communications, it is required to implement noise-free, clean communication quality, and transmitting/receiving functions. Therefore, the FTA (Fault Tree Analysis) analysis and failure search were performed on the reception noise, and the internal noise of the intercom that affected the reception noise and the none-transmition phenomenon was identified. We changed the multiple grounds of the intercom to a single ground and applied an improved method of filtering the DC Offset voltage. As a result, the voice quality of the communication system of the aircraft was improved through the reduction of the reception noise during formation flights, and it was verified by ground and flight tests.

• Journal of KIISE:Information Networking
• /
• v.31 no.6
• /
• pp.620-632
• /
• 2004

IP is not suitable for mobile nodes by network-based routing because mobile nodes are dynamically change their network attachment point. Mobile-IP is an IETF standard providing continuous access to the Internet for mobile nodes, but it has the triangle routing problem. Also it has a performance degradation problem by massive packet loss during layer 3 handoff of mobile nodes. Especially, two IETF multicast support schemes for Mobile-IP do not guarantee the quality of realtime multimedia services because they have several problems such as long routing path, packet duplication(hi-directional tunneling) and massive packet loss(remote subscription). In this paper, we propose a lossless remote subscription scheme that guarantees the quality of realtime multimedia services over Mobile-IP. From the result of simulation, we verified that the proposed scheme in this paper can reduce the delay time of remote subscription by the effect of the low latency handoff scheme that is extended to apply to the multicast group management and it requires only 0.58% buffer spaces of the previously proposed lossless remote subscription scheme.

• Journal of Korea Port Economic Association
• /
• v.38 no.2
• /
• pp.11-30
• /
• 2022

Korean ports have some problems in the aspect of quality & quantity in the bunkering process. Quality of bunker is assessed as more higher than competing ports. However, quality of bunkering procedure is assessed as lower. Especially, supply chain from loading of bunker to the bunker barge at oil terminal, transport it, and supply it to the ship has not been secured. Furthermore, aspect of quantity of bunker is more serious rather than that of quality of bunkering process. Disputes on the quantity of bunker between seller and buyer occur frequently, and residue & theft of bunker is also popularized issue and serious problem. Low bunkering fee is recognized as major reason of that problem, however, though low fee can be solved, it can not be necessary secured that problem could be solved, Therefore, this paper investigates and suggests the scheme to solve the quality problems of bunker supplying procedure, and develop solution toward advanced bunkering ports through removal of the quantity disputes. Concretely, this paper suggests introduction of quality system of bunker supply chain in the aspect of bunker supply procedure, and diversion from conventional sounding method to innovative Mass Flow Metering System in the aspect of bunker measuring. These two innovative solutions contribute to the removal and improvement of current structural problems in bunkering procedure.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.13 no.2
• /
• pp.115-123
• /
• 2018

This study is empirically intended to put forward the modeling and process improvement measures for the SCM capability in small venture firms. The findings are summarized as follows. There were strategic alliance, technological development and centralization in the modeling of strategic planning for supply chain, not the least of which is strategic alliance, followed by centralization and technological development. There were routing scheduling, network integration and third party logistics outsourcing in decision making, not the least of which was network integration. There were customer service management, productivity management and quality management in management control, not the least of which was quality management. And there were order management choice, pricing demand, shipment delivery and customer management in transaction support system, not the least of which was order management choice. As for the above-mentioned findings, to maximize the SCM capability and operate the optimized process in small venture firms, the existing strategic alliances can optimize the quality management and stabilize the transaction support system through the network sharing and integration from the perspective of relevant organizational members' capability and process improvement. And the strategic linkage between firms can maximize the integrated capability of information system beyond the simple exchange relation between electronic data, achieving a differentiated competitive advantage. Consequently, the systematization and centralization for the maximization of SCM capability, including the infrastructure construction based on the system compatibility and reliability for information integration, should be preceded before the modeling of the integrated capability for optimum supply chain and the best process management in the smart era.

• 대한공업교육학회지
• /
• v.40 no.2
• /
• pp.216-238
• /
• 2015

The purpose of this study was to identify the improvement plan of Korea Network for Occupations and Workers(KNOW) in terms of the information quality and usefulness for undergraduate students.'Homework of occupational information exploration'as research instrument was assigned to the engineering students taking career courses at KoreaTech in Chungnam province, Korea. Data was collected from two-hundred sixty six college students. The main results were as follows: The percentage of awareness of KNOW was very low(7.5%), but the mean of preference(73.5) and usefulness of career readiness(70.6) of KNOW were likely to be high. The information quality of KNOW was analysed in terms of both menu bar and evaluative components. In menu bar, the highest mean of information quality was'wage, job satisfaction, and job outlook'menu bar(71.7). On the other hand'task information on the job'had the lowest mean. In evaluative component, the highest mean of information quality was understandability(73.4), whereas the completeness was at the bottom(63.7). These results implied that the KNOW has the usefulness for engineering students to explore the occupational information and to make ready for career. Nevertheless, it is needed to publicize KNOW and to redeem menu bar and contents for the improvement of this online system.

• Journal of Service Research and Studies
• /
• v.8 no.4
• /
• pp.1-12
• /
• 2018

This study suggests a way to implement shared economic model of educational service in service era. As most shared economic models are innovating high-cost, low-quality structures in existing economies, there is a need for innovation models that improve high-cost low-quality structures to high-quality, low-cost structures in education services. Especially, since higher education and lifelong education are in urgent need of innovation, this study studied shared university model focused on higher education and lifelong education. In order to provide educational services at low cost and high quality, it is necessary to use idle resources, so it is necessary to introduce a shared economic model. Shared universities require a more efficient and effective supplier quality control, as the existing limited supplier group become widespread. Normative quality control is also needed to cultivate students as competent talent. In addition, in order to provide high-quality higher education services at a low cost, it is necessary to base the process quality management using advanced science and technology. Therefore, educational service quality management is a process of quality control that is well-balanced in terms of suppliers, customers, and processes.

• Review of Culture and Economy
• /
• v.17 no.2
• /
• pp.137-159
• /
• 2014

The items currently used in museum service evaluations fail to offer satisfactory suggestions that could aid in the improvement of museum services. This study aims to identify and develop items that take into consideration the unique nature of art museum services. This study also identifies factors that determine visitor satisfaction and decisions to revisit with the end of offering methods to improve art museum service. The research conducted was based on an on-site survey of visitors of the Gwangju Art Museum. 223 questionnaires were collected, 211 of which were used in the data analysis. Factor analysis was applied to identify service factors to be considered at art museums. Regression analysis was then applied to estimate the influence of each factor in visitor satisfaction and revisit intention. This study first identifies five service quality factors of art museums: display method, employers, content, facilities, and supplemental programs. Results of the regression analysis showed that content is the most important factor in raising customer satisfaction and revisit intention. Supplemental programs were also significant in raising young and family customer satisfaction. The results also showed that various supplemental services such as education and experiential programs were necessary. Service facilities were also statistically significant factors in customer satisfaction and revisit intention. This study contributes in identifying five factors that could better measure art museum service quality. It also suggests a method to improve museum service quality based on the results of empirical investigations. This information could be of great help to art museum operators and other researchers.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.7
• /
• pp.291-298
• /
• 2019

We describe the improvement of insulation performance and the prevention of electrolyte leakage in a single cell in order to prevent the fuming phenomenon caused by leakage of electrolyte in a lithium secondary battery in a submerged weapon (torpedo) operated in Korea. A torpedo using lithium secondary battery as a main power source (propulsion battery) can induce the heat and fuming phenomenon, which makes it inconvenient for naval equipment operation in Korea. In the simulation test, the electrolyte of some battery cells leaked in the battery pack unit, leading to a short circuit between the main power circuit and the terminal tab of the high voltage part. We analyzed the characteristics and mechanism of the lithium secondary battery during this heat generation and fuming phenomenon. In order to prevent leakage of the electrolyte in the lithium secondary battery, the design was improved via fundamental (terminal tap enhancement) and complementary (insulation block selection and installation) measures. Comparison of the performance test before and after the improvement showed that the tensile strength of the tap terminal was improved about 2 times and the withstand voltage characteristic was improved. The application of quality improvement measures resulted in no fuming even after more than 3 years of field operation. This result is expected to improve the operation and storage stability of the torpedo propulsion cell.

• 월간 기계설비
• /
• s.63
• /
• pp.29-50
• /
• 1995

감사원장 자문기구인 부정방지대책위원회(위원장 서영훈)는 $\ulcorner$공사질서, 어떻게 확립할 것인가?$\lrcorner$ 라는 주제로 우리 사회가 하루빨리 청산해야할 부실공사의 추방대책을 모색하는 공개토론회를 지난 9월 6일 한국 프레스센터 국제회의장에서 이시윤 감사원장을 비롯한 관련기관 및 관련업계 종사자들이 참석한 가운데 개최했다. 특히 이번 공개토론회는 우리의 안전을 위협하고 나아가서는 국가 경쟁력을 잃게 하는 부실공사의 원인을 심층진단하고 그 방지대책으로 불합리한 제도의 개선과 아울러 시민들의 감사활동을 통한 공사질서확립 방안에 대한 슬기와 지혜를 널리 모으는 중요한 자리로 후손들에게 자랑스러운 건설문화를 넘겨줄 수 있도록 밝고 건전한 공사질서를 세우는 방안에 대한 많은 의견이 있었다. 이날 이시윤 감사원장은 $\ulcorner$부실공사는 우리의 생명과 안전을 위협하고 국제적 위신을 실추시키며 국가경쟁력을 읽게 하는 부끄러운 폐습으로서 하루빨리 치유해야 할 망국병$\lrcorner$이라면서 $\ulcorner$감사원은 21세기 우리의 밝은 미래 창조를 가로막고 있는 이러한 부실공사 문제의 심각성을 인식하고 이의 근절을 최우선 과제로 정하여 감사원의 모든 감사역량을 부실공사 추방을 위한 감사활동에 기울여 왔다$\lrcorner$고 밝혔다. 또한 이시윤 감사원장은 $\ulcorner$지난해에 이어 올해는 건설환경 개선 및 품질혁신의 해로 선언하고 국민 불안감 해소를 위하여 주요시설물의 안전성 점검과 건설산업 개방에 대비한 대외경쟁력 제고의 기틀을 마련하는데 총력을 기울여 나가고 있다$\lrcorner$면서 $\ulcorner$나아가 부실공사 기동점검반을 편성 운영하여 공공공사 현장을 수시 점검하여 부실을 역동성 있게 척결하는 체제도 구축하는 등의 계획을 갖고 있다$\lrcorner$고 밝혔다.

• Journal of the Korea Society for Simulation
• /
• v.16 no.4
• /
• pp.67-75
• /
• 2007

Radio Frequency IDentification(RFID) is in the limelight of fields of military, delivery and library management as an alternative or barcode system. However, it is restricted within product manufacturing, sales and delivery. In this paper, we apply RFID technology into process, especially packing process management to gauge RFID applicability. To verify beneficial features of RFID, we simulate RFID-adopted packing process. As a result, we demonstrate the effectiveness of a RFID-based Process Improvement In manufacturing process. The results of performance evaluations demonstrate that the proposed RFID-based Process Improvement reduces the labour time, labour cost and material cost. Furthermore, we analyze the validity of RFID-based Process Improvement by RFID cost.