• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• 제11권2호
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• pp.157-178
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• 2013

This study gives a conceptual and basic direction to develop a URL (underground research laboratory) program for establishing the performance and safety of a deep geological disposal system in Korea. The concept of deep geological disposal is one of the preferred methodologies for the final disposal of spent nuclear fuel (SNF). Advanced countries with radioactive waste disposal have developed their own disposal concepts reasonable to their social and environmental conditions and applied to their commercial projects. Deep geological disposal system is a multi-barrier system generally consisting of an engineered barrier and natural barrier. A disposal facility and its host environment can be relied on a necessary containment and isolation over timescales envisaged as several to tens of thousands of years. A disposal system is not allowed in the commercial stage of the disposal program without a validation and demonstration of the performance and safety of the system. All issues confirming performance and safety of a disposal system include investigation, analysis, assessment, design, construction, operation and closure from planning to closure of the deep geological repository. Advanced countries perform RD&D (research, development & demonstration) programs to validate the performance and safety of a disposal system using a URL facility located at the preferred rock area within their own territories. The results and processes from the URL program contribute to construct technical criteria and guidelines for site selection as well as suitability and safety assessment of the final disposal site. Furthermore, the URL program also plays a decisive role in promoting scientific understanding of the deep geological disposal system for stakeholders, such as the public, regulator, and experts.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제17권10호
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• pp.2359-2368
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• 2013

In this paper, an IRD (internal read data) circuit preventing the reentry into the read mode while keeping the read-out DOUT datum at power-up even if noise such as glitches occurs at signal ports such as an input signal port RD (read) when a power IC is on, is proposed. Also, a pulsed WL (word line) driving method is used to prevent a DC current of several tens of micro amperes from flowing into the read transistor of a differential paired eFuse OTP cell. Thus, reliability is secured by preventing non-blown eFuse links from being blown by the EM (electro-migration). Furthermore, a compared output between a programmed datum and a read-out datum is outputted to the PFb (pass fail bar) pin while performing a sensing margin test with a variable pull-up load in consideration of resistance variation of a programmed eFuse in the program-verify-read mode. The layout size of the 8-bit eFuse OTP IP with a $0.18{\mu}m$ process is $189.625{\mu}m{\times}138.850{\mu}m(=0.0263mm^2)$.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제18권1호
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• pp.115-122
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• 2014

In this paper, reliability is secured by sensing a post-program resistance of several tens of kilo ohms and restricting a read current flowing over an unblown eFuse within $100{\mu}A$ since RWL driver and BL pull-up load circuits using a regulated voltage of V2V ($=2V{\pm}10%$) are proposed to have a wide operating voltage range for eFuse OTP memory. Also, when a comparison of a cell array of 1 row ${\times}$ 32 columns with that of 4 rows ${\times}$ 8 columns is done, the layout size of 4 rows ${\times}$ 8 columns is smaller with $187.065{\mu}m{\times}94.525{\mu}m$ ($=0.01768mm^2$) than that of 1 row ${\times}$ 32 columns with $735.96{\mu}m{\times}61.605{\mu}m$ ($=0.04534mm^2$).

• Journal of the Korea Concrete Institute
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• 제26권1호
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• pp.63-70
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• 2014

This experimental study was intended to improve the compressive strength of multi-walled CNT reinforced cementitious composites with efficiency. The variables considered are the degree of sonication, the amount of surfactant, the replacement ratio of silica fume, etc. Optical microscope informed that fiber dispersion of CNT was improved with the increase of sonication time, and the compressive strength was proved to be enhanced as the degree of sonication increased. When superplasticizer as a surfactant had SP/CNT ratio of 4~6, the best improvement in strength was obtained. Silica fume was shown to produce the highest compressive strength at 10% replacement. Microstructure of CNT composites was also analyzed; XRD and SEM results indicated that CNT addition hardly changed hydration products and microstructure, and MIP analysis found the reduction of total porosity as well as the increase of nano-pores with the size of tens of nm instead of the decrease of pore distribution in the region of around 10 ${\mu}m$ and 100 nm. The results of microstructure analysis explains that the strength improvement is closely related to physical contribution rather than chemical influence by adding CNT.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제21권6호
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• pp.103-108
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• 2020

Generally, the cargo tank of LPG carriers corresponds to an independent tank Type A defined by the International Maritime Organization (IMO). The outside of the tank is insulated by polyurethane foam, and the tank is made of expensive low temperature steel that can withstand temperatures as low as -50℃. The cargo tank is composed of outer shell plates, bulkheads, stiffeners, web frames, and stringers. Among them, the outer shell plates, bulkheads, and stiffeners can be designed without structural analysis by the Classification Rules and are constructed easily through optimal design. On the other hand, optimal design, including numerous structural analysis, is not performed because web frames and stringers should be designed and approved through structural analysis. Only adequate design, which determines the design dimensions through several dozen structural analysis, is performed. In this study, for finite element analysis, eight loading conditions were applied, and the deformation of the entire ship for each loading condition was considered. The minimum weight design was performed for the web frames of cargo tanks in the 82,000 ㎥ LNG carrier through the gradient-based optimization technique, and the weight was reduced by approximately 108 tons per ship.

• Journal of the Korea Society of Computer and Information
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• 제25권3호
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• pp.243-250
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• 2020

In this paper, we propose an effective software education scheme for universities. The key idea of this software education scheme is to analyze software curriculum of QS world university rankings Top 10, SW-oriented university, and regional main national university. And based on the results, we propose five improvements for the effective SW education method of universities. The first is to enhance the adaptability of the industry by developing courses based on the SW developer's job analysis in the curriculum development process. Second, it is necessary to strengthen the curriculum of the 4th industrial revolution core technologies(cloud computing, big data, virtual/augmented reality, Internet of things, etc.) and integrate them with various fields such as medical, bio, sensor, human, and cognitive science. Third, programming language education should be included in software convergence course after basic syntax education to implement projects in various fields. In addition, the curriculum for developing system programming developers and back-end developers should be strengthened rather than application program developers. Fourth, it offers opportunities to participate in industrial projects by reinforcing courses such as capstone design and comprehensive design, which enables product-based self-directed learning. Fifth, it is necessary to develop university-specific curriculum based on local industry by reinforcing internship or industry-academic program that can acquire skills in local industry field.

• Journal of Korea Technology Innovation Society
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• 제19권1호
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• pp.105-136
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• 2016

This paper analyzed the qualitative evaluation indicators of the SYSTEM sector of the LINC program, which aimed at strengthening ability of regional universities through the activities of industry-academia cooperation (IAC). By using interview data and the program reports of universities, this research explored the problems of the indicators and suggested improvement measures which could lead to performance creativity. According to research results, in university system reform for activating IAC, some improvements are required as follows: limiting excessive expansion of IAC-friendly faculty evaluation; and evaluating soft aspects in the reform of academic affairs. In relation to strengthening of ability of the IAC organization, the indicators need to be amended as follows: enhancing the role of channel of IAC Foundation; strengthening the function of planning team of the IAC Foundation; and inducing development of own model of universities for IAC. As regards expansion of IAC infrastructure, it is necessary to enlarge the manpower who can develop programs of the support center in the foundation and to secure of operators for effective operation of joint-using equipments. Therefore, the indicators are required to be upgraded, considering these improvement direction.

• Convergence Security Journal
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• 제14권6_1호
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• pp.89-98
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• 2014

Simultaneously with the founding of the Joseon military system was reformed. On the basis of Koryo's '2gun 6wie(二軍 六衛)' reorganized into '10wie 50ryong(10衛 50領)'. But the de facto central military power was in Euhungqingunwie(義興親軍衛) that is Lee Seong-gye's Elite Guard. In addition to these make up the backbone of the central forces that were Siwiepae(侍衛牌). Also a anti-legislation Seongzhongaima(成衆愛馬) was also presented. But soon the military command and military systems will start to repair. First, reform of military command system of the unified command system shall be established for the Euhungqingunwie(義興親軍衛). And Jeongdojeon has strengthened the military education and training. But, for the establishment of Military command system the most important was the reform of the private soldier. Military systems also have been systematized. shipwie(十衛) was changed to the shipsa(十司) in Taejo. After, they are expanded to shipyisa(十二司) in Sejong. And, the Gabsa(甲士) were returned. In addition, various special branch of the army, Byelsiwie(別侍衛), Naegumewie(內禁衛), gyumsabok(兼司僕) etc, are increased and founded.

• Journal of the Korean Institute of Landscape Architecture
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• 제43권5호
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• pp.87-99
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• 2015

Prior hardware-centered rural development projects implemented top-down rural community regeneration via the local government in accordance with central government agency policies. To improve this, software-centered projects have been promoted since 2000. With central agency-led rural development projects changing into local government-led ones, rural community regeneration has been built per village. Although rural community regeneration projects appear to have implemented a bottom-up development currently, the top-down development procedures being facilitated by the intervention of administrative institutions have not disappeared. In this regard, the purpose of this research thesis is to effectively perform bottom-up development methods that go one step further from the current process of rural community regeneration. As the research site, this thesis selected Geochang, which has difficulties in being steadily maintained and operated despite the development of various rural community regeneration projects. Subsequently, it determined the current status and substantial analysis of a project of the rural community regeneration in Geochang through 1:1 interviews with civil servants in charge of administration as well as conducted a prior study on rural resident awareness of rural community regeneration through a survey of village head members and in-depth interviews with rural residents. Based on these data, a 10 times-round table conference was held under the participation of pertinent civil servants, professionals and rural residents to select practical strategies for cooperative rural community regeneration in Geochang as five key areas: local food, culture & welfare, rural villages, community development, and urban and rural interchanges. In addition, it is considered that the project of building villages must be implemented by establishing steadfast administrative co-operation systems, strengthening rural residents' participation capacities and supporting professionals' systemic integrated operation and maintenance. By doing so, this research thesis sought to determine practical strategies in the cooperative rural community regeneration in Geochang. It is expected that bottom-up development rural community regeneration will be built and introduced in each rural community in the future.

• KSCE Journal of Civil and Environmental Engineering Research
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• 제38권4호
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• pp.601-610
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• 2018

Since the building construction works are repeated vertically in a limited space, there is not a great need for the location information of each activity in the schedule management. On the other hand, civil engineering works such as road and railway projects consist of a large number of earthworks, long bridges, and long tunnels. These types of work should be controlled in a horizontal space according to the linear axis of several tens of kilometers. In other words, since most of the activities are managed in the unit of distance from the start point to the end point, it is possible to improve the efficiency of the schedule management by linking the location information of the activity with the schedule data in the schedule management system. This study presents a methodology for creating a linear schedule chart specific to a project with horizontal work space and compares the convenience with the existing Gantt chart. In addition, the methodology of linking linear schedule chart to the 4D CAD system, which is a typical BIM technology in the construction phase, is presented to improve the usability of BIM. The practical applicability of the proposed methodology was verified statistically.