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      • 비드를 이용한 내시경용 연속봉합기구

        조문기(Moon Ki Cho),이창양(Chang Yang Lee),홍대희(Daehie Hong),전훈재(Hoon Jai Chun),이규백(Kyu Back Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

        This paper deals with the designing of instrument for achieving surgical operation in the stomach and gullet using endoscope channel. The method used herein was to provide beads to knot suturing thread automatically. Following design rules were applied : 1) that instrument must be designed to enable surgical operator to stitch successively by only simple handling 2) that instrument must be designed to minimize insertion and extraction of endoscope. The main result from the experiment with animal stomach was that the surgical operation time was reduced and successive suture was available. Considering the requirement of operator’s highly trained skills and the discomfort of patient in traditional suture process, the proposed design is expected to markedly improve the endoscopic suturing performance.

      • KCI등재

        자율 주행을 위한 Edge to Edge 모델 및 지연 성능 평가

        조문기(Moon Ki Cho),배경율(Kyoung Yul Bae) 한국지능정보시스템학회 2021 지능정보연구 Vol.27 No.1

        Up to this day, mobile communications have evolved rapidly over the decades, mainly focusing on speed-up to meet the growing data demands of 2G to 5G. And with the start of the 5G era, efforts are being made to provide such various services to customers, as IoT, V2X, robots, artificial intelligence, augmented virtual reality, and smart cities, which are expected to change the environment of our lives and industries as a whole. In a bid to provide those services, on top of high speed data, reduced latency and reliability are critical for real-time services. Thus, 5G has paved the way for service delivery through maximum speed of 20Gbps, a delay of 1ms, and a connecting device of 10<SUP>6</SUP>/km² In particular, in intelligent traffic control systems and services using various vehicle-based Vehicle to X (V2X), such as traffic control, in addition to high-speed data speed, reduction of delay and reliability for real-time services are very important. 5G communication uses high frequencies of 3.5Ghz and 28Ghz. These high-frequency waves can go with high-speed thanks to their straightness while their short wavelength and small diffraction angle limit their reach to distance and prevent them from penetrating walls, causing restrictions on their use indoors. Therefore, under existing networks it’s difficult to overcome these constraints. The underlying centralized SDN also has a limited capability in offering delay-sensitive services because communication with many nodes creates overload in its processing. Basically, SDN, which means a structure that separates signals from the control plane from packets in the data plane, requires control of the delay-related tree structure available in the event of an emergency during autonomous driving. In these scenarios, the network architecture that handles in-vehicle information is a major variable of delay. Since SDNs in general centralized structures are difficult to meet the desired delay level, studies on the optimal size of SDNs for information processing should be conducted. Thus, SDNs need to be separated on a certain scale and construct a new type of network, which can efficiently respond to dynamically changing traffic and provide high-quality, flexible services. Moreover, the structure of these networks is closely related to ultra-low latency, high confidence, and hyper-connectivity and should be based on a new form of split SDN rather than an existing centralized SDN structure, even in the case of the worst condition. And in these SDN structural networks, where automobiles pass through small 5G cells very quickly, the information change cycle, round trip delay (RTD), and the data processing time of SDN are highly correlated with the delay. Of these, RDT is not a significant factor because it has sufficient speed and less than 1 ms of delay, but the information change cycle and data processing time of SDN are factors that greatly affect the delay. Especially, in an emergency of self-driving environment linked to an ITS(Intelligent Traffic System) that requires low latency and high reliability, information should be transmitted and processed very quickly. That is a case in point where delay plays a very sensitive role. In this paper, we study the SDN architecture in emergencies during autonomous driving and conduct analysis through simulation of the correlation with the cell layer in which the vehicle should request relevant information according to the information flow. For simulation: As the Data Rate of 5G is high enough, we can assume the information for neighbor vehicle support to the car without errors. Furthermore, we assumed 5G small cells within 50 ~ 250 m in cell radius, and the maximum speed of the vehicle was considered as a 30km ~ 200 km/hour in order to examine the network architecture to minimize the delay.

      • KCI등재
      • KCI등재후보

        노인을 위한 지역사회 자원연계사업 관한 한 · 일 비교연구

        이서영(Lee, Seo-Young),조문기(Cho, Moon-Ki) 대한일어일문학회 2016 일어일문학 Vol.69 No.-

        This study examined Korean-type community-linked care projects whose concept has a structure different from Japan"s publicly established community asset-linked process based on the linkage between its comprehensive community support centers and home-care support centers. This is also the problem surrounding Korea"s pilot care projects which have started without establishing Japan"s community"s residential area conceptfor elderly care insurance. Specifically, these problems include a failure to activate network meetings through the existing formed community networks due to the nature of communities, and a lack of local governments" positive support and publicity efforts. These problems were examined and the following proposals are presented. First, to overcome the limits of access to the free public services of the current community asset-linked projects, it is imperative to explore available resources by city and province, and to form a close-knit networking thereof. Second, there is a need to standardize care plans so as to boost professionalism of the care services, to improve welfare devices and visit-and-care services, and to organize an effective system for the prevention of various diseases. Third, there is a need to prepare measures for expanding beneficiaries of the care projects, for raising finances, and for effectively operating the services in order to improve the quality of managing team-accessed casesthough the development ofprofessional manpower.

      • KCI등재

        SANET-CC : 해상 네트워크를 위한 구역 IP 할당 프로토콜

        배경율(Kyoung Yul Bae),조문기(Moon Ki Cho) 한국지능정보시스템학회 2020 지능정보연구 Vol.26 No.4

        Currently, thanks to the major stride made in developing wired and wireless communication technology, a variety of IT services are available on land. This trend is leading to an increasing demand for IT services to vessels on the water as well. And it is expected that the request for various IT services such as two-way digital data transmission, Web, APP, etc. is on the rise to the extent that they are available on land. However, while a high-speed information communication network is easily accessible on land because it is based upon a fixed infrastructure like an AP and a base station, it is not the case on the water. As a result, a radio communication network-based voice communication service is usually used at sea. To solve this problem, an additional frequency for digital data exchange was allocated, and a ship ad-hoc network (SANET) was proposed that can be utilized by using this frequency. Instead of satellite communication that costs a lot in installation and usage, SANET was developed to provide various IT services to ships based on IP in the sea. Connectivity between land base stations and ships is important in the SANET. To have this connection, a ship must be a member of the network with its IP address assigned. This paper proposes a SANET-CC protocol that allows ships to be assigned their own IP address. SANET-CC propagates several non-overlapping IP addresses through the entire network from land base stations to ships in the form of the tree. Ships allocate their own IP addresses through the exchange of simple requests and response messages with land base stations or M-ships that can allocate IP addresses. Therefore, SANET-CC can eliminate the IP collision prevention (Duplicate Address Detection) process and the process of network separation or integration caused by the movement of the ship. Various simulations were performed to verify the applicability of this protocol to SANET. The outcome of such simulations shows us the following. First, using SANET-CC, about 91% of the ships in the network were able to receive IP addresses under any circumstances. It is 6% higher than the existing studies. And it suggests that if variables are adjusted to each port’s environment, it may show further improved results. Second, this work shows us that it takes all vessels an average of 10 seconds to receive IP addresses regardless of conditions. It represents a 50% decrease in time compared to the average of 20 seconds in the previous study. Also Besides, taking it into account that when existing studies were on 50 to 200 vessels, this study on 100 to 400 vessels, the efficiency can be much higher. Third, existing studies have not been able to derive optimal values according to variables. This is because it does not have a consistent pattern depending on the variable. This means that optimal variables values cannot be set for each port under diverse environments. This paper, however, shows us that the result values from the variables exhibit a consistent pattern. This is significant in that it can be applied to each port by adjusting the variable values. It was also confirmed that regardless of the number of ships, the IP allocation ratio was the most efficient at about 96 percent if the waiting time after the IP request was 75ms, and that the tree structure could maintain a stable network configuration when the number of IPs was over 30000. Fourth, this study can be used to design a network for supporting intelligent maritime control systems and services offshore, instead of satellite communication. And if LTE-M is set up, it is possible to use it for various intelligent services.

      • 고객만족도가 기업가치 관련성에 미치는 영향에 관한 연구

        배기수(Bae, Khee Su),조문기(Cho, Moon Ki) 한국산업경영학회 2008 한국산업경영학회 발표논문집 Vol.2008 No.4

        고객이 만족하는 상품, 서비스를 제공하는 기업은 경쟁력을 향상시켰다고 할 수 있다. 이 같은 경쟁력의 향상은 더 많은 수익으로, 그리고 기업가치의 증가로 이어질 것이다. 주식 시장의 투자자들은 기업 가치가 높은, 혹은 높아질 기업에 투자하여 기업의 성장에 따른 초과 투자 이익을 얻으려 노력한다. 고객 만족도가 높은 기업은 기업 가치가 높아지며 따라서 투자자들의 자본은 이 같이 가치가 높은 기업으로 흘러갈 것이다. 결국 고객만족도의 증대는 기업의 시장가치의 증가로 이어지고, 이는 투자자들의 수익과 연결될 것이다. 본 논문은 기업이 달성한 고객만족과 기업가치와의 관련성에 대해 분석하였다. 분석에 사용된 표본은 고객만족도점수와 재무자료를 구할 수 있는 기업을 대상으로 1999년부터 2006년까지 392개(기업-년)이다. 선행연구에서 기업가치에 영향을 미치는 변수들을 통제한 후 고객만족도(CSI)가 기업가치(Tobin'Q)에 미치는 영향을 분석한 다중회귀분석 결과 고객만족도의 계수는 산업더미를 포함한 경우와 그렇지 않은 경우의 모형에서 모두 통계적으로 5%와 1% 유의수준에 유의한 양(+)의 값을 갖는 것으로 나타났다. 모형의 설명력 또한 0.751, 0.738로 매우 높은 것으로 나타났다. 이러한 결과는 고객만족도가 높을수록 기업가치가 증가한다는 본 연구의 가설을 지지하는 결과라 할 수 있다. 즉, 기업이 고객을 만족시키기 위해 지출한 비용은 결국 기업가치를 증대시킨다는 것을 의미한다. 고객만족도가 기업가치를 가늠할 수 있는 유용한 측정도구임을 밝힌 본 연구의 결과는 투자자, 채권자 등 회계정보이용자들에게 유용한 정보를 제공할 수 있을 것으로 사료된다. This study investigates empirically the relation of firm value and Customer Satisfaction. As for the stage of empirical analysis, the process was carried out in the order of establishment of research hypotheses, elaboration of a test model, definition and measurement of variables, selection of sample companies, empirical analysis and interpretation of result. In the regression analysis, Customer Satisfaction Index is a dependent variable providing measures of firm value. To measure customer satisfaction index, we resorted to the cross-sectional adaptation of the Korea Productivity Center. For the regression analysis, Customer Satisfaction Index variable is a test variable. In addition to the test variable, debt-to-assets ratio and size are chosen as control variables because these variables are likely to affect the direction of Firm Value. The analysis shows that the research hypothesis is supported under the 1% significance level. In other words, statistically significant increment in amounts of firm value is observed after the increment of an Customer Satisfaction Index. In conclusion, the practical implication of the result attained by this study is that firms may be rightfully encouraged to increment Customer Satisfaction Index.

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