• KIEAE Journal
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• 제4권3호
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• pp.187-194
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• 2004

In many other buildings, hospital is very important because of its function and purpose. A proper building service systems including heating, cooling, ventilation and plumbing systems is required in hospial. Besides, a special systems like medical gas, vacuum cleaning systems are required to prevent contamination as well as cure a patient in hospital. Ventilation is very important method to keep the indoor pressure and clean class. There are some specific rooms to consider clean class and indoor pressure in the general hospital. In this article, specific rooms were set to operating room, laboratory, ICU, isolation unit, and sterilizer room. In this case study, design factors of ventilation system, including air changes of OA and TA, indoor pressure, clean class, filter, and material of system, of specific rooms in hospital were proposed through a literature research and a design examples review.

• 한국통신학회논문지
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• 제33권6B호
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• pp.450-455
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• 2008

본 논문에서는 기존의 EPC Class 1 RFID 시스템에서의 태그 인식 절차와 태그 충돌 방지 알고리즘을 분석하였으며, 태그 인식 속도를 향상시키기 위한 고속 충돌 방지 알고리즘을 제안한다. 고속 충돌 방지 알고리즘에서는 태그 인식 과정에서 태그의 충돌 정보를 이용하고, 기존의 알고리즘에서 존재하던 불필요한 절차를 생략하였다. 성능 평가를 위하여 기존의 알고리즘과 제안한 알고리즘을 수학적으로 분석하였고, 이를 시뮬레이션으로 검증하였다. 결과에 따르면, 고속 충돌 방지 알고리즘이 기존의 알고리즘에 비해 상당한 성능향상을 보임을 확인할 수 있었다.

• 영어어문교육
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• 제8권1호
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• pp.1-13
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• 2002

One of the benefits of the internet-assisted instruction is that it can improve L2 Learners' motivation to express themselves in English. The purpose of this paper is to investigate an effective approach to British-American fiction learning in Korean universities, which can emphasize communicative strategies drawing on video-conferencing system, a chat system(CUSeeMe), and an e-mail system. Students are passive participants who cannot assert their creativity in the traditional teaching method of British-American fiction, which mainly relies upon reading and translation far from literature lessons. In CCDL(Cross-cultural distance learning) class, students can play active roles in asserting their own ideas and assuming considerable responsibility for making a presentation in English. A professor can play a role as a coordinator in supporting the students' activities and in winding up the class. The main significance of this article lies in providing a paradigm for CCDL class beyond the limitation of the traditional teaching method of British-American fiction in Korea and futhermore in exploring the eclectic integration of the traditional one and CCDL.

• 제어로봇시스템학회논문지
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• 제17권5호
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• pp.412-418
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• 2011

The scale of wind turbines has continuously increased over the last decade. Especially, the rapid growth of the rotor diameter has brought about the increase of the tower height and the load on the rotor blade, as can be seen in the case of a 5MW class wind turbine with 126m rotor diameter. This trend means the increasing possibility of system failure. In addition to that, it is impossible for human operators to stay and manage all the turbines in the case of a large-scale wind farm. For these reasons, the operation and maintenance technology is getting more importance. In this paper, we present an unmanned remote monitoring system for MW class wind turbines and its application to YeungHeung wind test bed.

• 한국보육지원학회지
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• 제13권1호
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• pp.19-41
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• 2017

Objective: This study aimed to provide policy implications by studying the class size of early childhood education institutes. Methods: By looking through researches, the educational influence of class size was examined. By using the latest statistical data, class size standard and status were compared. After class size perception in the field was considered and the main results of advanced researches were summarized and analyzed, the actual condition of class size was diagnosed. Furthermore, the national research trend was analyzed. Results: First, class size was an influencing factor on young children and teachers and its importance was reconfirmed. Second, as for standard in relation to class size in Korea, the maximum class size and teacher-child ratio were not presented together. In respect of overseas standards, infancy has similar standards, but early childhood has a little higher ratio. In the educational fields, there was growing awareness that class size should be modified. Third, there were not enough domestic researches on class size and they tended to be biased in terms of the method, targets, and contents. Conclusion/Implications: It is suggested that it is necessary to establish a class size policy for future early childhood education institutes, to implement a system, and to perform follow-up studies.

• Journal of applied mathematics & informatics
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• 제22권1_2호
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• pp.435-440
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• 2006

Let G be a simple graph with vertex set V(G) and edge set E(G). A subset S of E(G) is called an edge cover of G if the subgraph induced by S is a spanning subgraph of G. The maximum number of edge covers which form a partition of E(G) is called edge covering chromatic number of G, denoted by X'c(G). It is known that for any graph G with minimum degree ${\delta},\;{\delta}-1{\le}X'c(G){\le}{\delta}$. If $X'c(G) ={\delta}$, then G is called a graph of CI class, otherwise G is called a graph of CII class. It is easy to prove that the problem of deciding whether a given graph is of CI class or CII class is NP-complete. In this paper, we consider the classification of nearly bipartite graph and give some sufficient conditions for a nearly bipartite graph to be of CI class.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2012년도 전기공동학술대회 논문집
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• pp.183-183
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• 2012

As as result of development of new voyage route, especially Baltic seas, it is necessary for the design to meet ice class requirements as vessels continue to increase in this route. For this reason Finish-Swedish ice class has recently amended a regulation on the propulsion shafting design and engine output required for the ships which will be navigable in the brash ice channels broken by ice-breakers in Baltic seas. Therefore, this study shows the appropriate calculation methods for the design of engine output and propulsion shafting system based on ice class requirements.

• 대한산업공학회지
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• 제29권3호
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• pp.222-229
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• 2003

In this paper, we address a layout design problem, PTN[2], for determining an appropriate 2-class-based dedicated storage layout in a class of unit load storage systems. Our strong conjecture is that PTNI2] is NP-hard. Restricting PTN[2], we provide three solvable cases of PTN[2] in which an optimal solution to the solvable cases is one of the partitions based on the PAI(product activity index)-nonincreasing ordering. However, we show with a counterexample that a solution based on the PAI-non increasing ordering does not always give an optimal solution to PTN[2]. Utilizing the derived properties, we construct an effective heuristic algorithm for solving PTN[2] based on a PAI-non increasing ordering with performance ratio bound. Our algorithm with O($n^2$) is effective in the sense that it guarantees a better class-based storage layout than a randomized storage layout in terms of the expected single command travel time.

• 항공우주시스템공학회지
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• 제4권3호
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• pp.34-38
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• 2010

ACN(Aircraft Classification Number) is allocated by marketing group during early stage of aircraft design phase and is a critical parameter to decide whether the designed aircraft can be landed or not in a certain airport. The loading on the main landing gear wheels, selection of main landing gear tire and estimation of ACNs for flexible and rigid pavements were done for the proposed medium-class aircraft. The estimated ACN values are compared with the similar class aircraft. And PCN(Pavement Classification Number) values of airport in Korea are surmmarized. Results showed that the currently proposed medium-class aircraft can land any airport in Korea.

• 한국의류학회지
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• 제34권5호
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• pp.873-887
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• 2010

Yuan Shi Kai, the first President of the Republic of China, established a ceremonial uniform system based on ancient styles in 1914 just before the national polity was changed to the Empire of China in 1915. This system is Jisiguanfuzhi (a system on costumes for memorial services), and figures included in the system are Jisiguanfutu (figures showing costumes for memorial services). This study is the first to examine Jisiguanfuzhi and Jisiguanfutu and to approach the background idea of the establishment of the system with a focus on the meaning of 'unity.' Jisiguanfuzhi regulates the ceremonial uniform system of all classes from the President along with the 1st-class to the 5th-class people. The uniform consists of a crown, robe, belt, the mid-section cloth, and boots. In addition, the uniforms of ritual musicians and dancers are included. The basic principles in establishing the system were the restoration of ancient systems, the adoption of convenience, the acceptance of current practices, and the implication of symbolism. Jisiguanfuzhi clarifies that the pattern of the ceremonial uniforms was modeled on Juebianfu, for religious services. The reason for choosing Juebianfu for religious services was to achieve 'unity' and Juebianfu was associated with 'unity' because it was common to all, from the emperor to the gentlemen class, in ancient times. Yuan Shi Kai tried to show flexibility to the gentlemen class who represented the intellectuals at that time by adopting Juebianfu for religious services, fearing that the gentlemen class might oppose the attempt to restore the imperial system. Therefore, although Jisiguanfuzhi adopted mostly Mianfu and royal sacrificial robes, it also emphasized 'unity' by professing that the uniforms were based on Juebianfu for religious services.