• Korean journal of applied entomology
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• v.54 no.4
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• pp.303-310
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• 2015

The diamondback moth, Plutella xylostella, overwinters in some protected areas in Korea. Using a sex pheromone trap, the adults were monitored since the occurrence of the overwintering populations. In Andong, P. xylostella exhibited four adult peaks in a year. Biological characters, such as cold tolerance, insecticide susceptibility, and developmental rate, were analyzed and showed a significant variation among different local overwintering populations. Population genetic variation was assessed with molecular markers, in which the initial high genetic variation among the overwintering populations decreased with the progress of seasons. These results suggests that there may be a significant migration of P. xylostella to decrease the genetic variation among the different local populations that are different in biological characters.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.38 no.3
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• pp.197-202
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• 2014

The efficiency of a catalytic converter depends on the flow distribution across a system's chemically active substrate. If irregularities or non-uniform flow patterns exist, the system's conversion efficiency decreases, whereas the manufacturing cost increases. Therefore, it is important to analyze the internal flow of a catalytic converter. In this study, flow pattern measurements along the minor axis were recorded at the mid and exit planes of a ceramic honeycomb catalytic converter at flow rates of 37.8 l/s and 94.4 l/s. Flow distributions of the measurement plans were compared with an automotive company's computed velocity profiles. Measurements along the minor axis showed uneven velocity profiles. The ${\upsilon}$-velocity components between the honeycomb bricks were small but somewhat erratic opposite the intake side of the converter, however, they became flatter in measurements recorded near the intake entrance. For almost all velocity values, the computer model suggested velocities greater than the measured values.

• The Journal of Korean Association of Computer Education
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• v.12 no.6
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• pp.69-79
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• 2009

The current user interface (UI) of NEIS school affairs business system is not efficient in conducting the business because of complicated data input forms as well as unharmonious connection between similar items and functional menu. In the paper, the term UI means a comprehensive concept including input/output, input/output related functionality, and menu configuration for users to perform their tasks. The first survey, carried out with one hundred teachers at three elementary schools of Kyeonggi-do, shows that the UI problems of the system are manual inputs, inconvenient menu configuration, disconnection between academic calendar and educational process, complexities of managing attendance report and curriculum evaluation, etc. We have improved the UI design by providing more efficient input method and more systematic menu configuration compared to the current system, and then evaluated the design through the second survey. Evaluation results show that users prefer the proposed UI design especially from the viewpoint of user-friendly input interface and user-oriented view composition.

• Korean Journal of Logic
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• v.16 no.2
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• pp.131-154
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• 2013

Michael Williams, in his paper, rejects the wide-accepted view that Donald Davidson's radical interpretation is a truth conditional account of meaning, and suggests a claim that robust truth in fact does not play any role in Davidson's interpretation and thus interpretation can be in accord with the deflationary theory of truth. In this paper, I will first research the right understanding on the explanatory relations in radical interpretation between truth and meaning, and on that ground, will evaluate the adequacy of Williams' suggestion. My diagnosis is that the acceptability of Williams' idea depends on how we regard the several factors which are crucial for interpretation. Especially I will argue that whether truth condition is regarded as deflationary or inflationary makes difference to the way of understanding radical interpretation, hence the room for taking radical interpretation as deflationary can be in two different ways. Furthermore I will show the same argument can be applied to Williams' another claim that Paul Horwich's use theory of meaning is similar to Davidson's account.

• Communications of Mathematical Education
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• v.26 no.1
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• pp.15-28
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• 2012

In order to study the relation between self-directed learning readiness and mathematical inclination, we survey the adjusted SDLRS(self-directed learning readiness scale) of Guglielmino's model and the mathematical inclination, the recognition of mathematics for 2011 year engineering freshmen in D university. Research results are as follows: First of all, middle level engineering freshmen showed average level of self-directed learning readiness, and they had lower level of motivation, passion and time management skill. The relation of SDLR and the mathematical inclination was strong. Furthermore, SDLR and the recognition of mathematics in engineering freshmen was found to be the most closely related. Based on the results of the study, we suggest to study of strategies to elevate SDLR of engineering students and improve their achievement in college mathematics. Especially, we suggest that college mathematics for engineering freshmen must be focused on the improvement of SDLR.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.4
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• pp.371-380
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• 2013

D2D (Device-to-Device) communication on an underlying cellular infrastructure which exploits the same spectrum has several advantages such as increased resource utilization and improved cellular coverage. However, D2D communication system needs to cope with ICI (Inter-Cell Interference) and interference between cellular and D2D links. As a result, macro UEs (User Equipments), especially those located near cell edge, will suffer from serious link performance degradation. We propose a novel interference avoidance mechanism assisted by SRN (Shared Relay Node) in this paper. SRN not only performs data re-transmission as a usual Type II relay but also has several features newly defined to avoid interference between cellular and D2D links. In particular, we suggest resource allocation methods based on the SRN for effective interference avoidance, and evaluate their performance through computer simulations.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.5
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• pp.598-605
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• 2012

In this paper, a multi-layer dual-band bandpass filter using aperture-coupling is proposed. Two coupling paths are formed with the two apertures which exist between two dual-mode resonators. The coupling coefficients can be adjusted without changing the shape of resonators. The bandwidth of the second passband can be adjusted without affecting the bandwidth of the first passband using the size of an aperture between stubs of the dual-mode resonator. The aperture coupling mechanism is theoretically analysed. The dual-mode bandpass filter for the 2.4 GHz WLAN, 3.5 GHz WiMax was designed and fabricated. The fabricated filter shows centered 2.45 GHz and 3.5 GHz with 9 % and 8 % of the bandwidth.

• Journal of Korea Game Society
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• v.7 no.4
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• pp.125-134
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• 2007

There have been many researches on the characteristics of item trade. However, most researches were done by carrying out a survey and there has been few researches by analyzing the economy in online games. So, this article studied the cause of item trade by looking into the supply and demand of items in online games. The results shows that item trade is taking place mostly among only a few number of gamers who enjoy enchanting and who engage in castle sieges and blood pledge battles. The proportion of item trade by general garners is not so big. And major item providers are gold farms, not garners. Therefore, item trade is mostly carried out by a large number of garners who trade a small amount of sum and by a small number of heavy garners who trade large amount of sum. Understanding this characteristic of item trade would be a good ground for reviewing the policies and social effect regarding item trades.

• Korean Architects
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• s.475
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• pp.65-74
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• 2008

1970년 초에 배럴당 1불하던 원유가가 지금은 120불을 상회하고 있다. 더욱 놀라운 것은 3년 전만 하더라도 40불 이하 수준이던 것이 불과 몇 년 사이에 3배 이상 급등해 버린 것이다. 우리는 아직 유가 100불 이상의 고유가 시대에 대한 고통을 실감하지 못하고 있지만, 빠른 시일 안에 대항한 형태로 우리를 불편하게 하고, 더가서는 사회 경제 문화 등 모든 우리의 활동패턴에 근본적 변화를 일으킬 것이라는데는 어느 누구도 이의를 달지 못할 것이다. 한편 90년대만 하더라도 친환경 건축기술은 선택적 사양으로 인식되어 왔으며, 일부 고급건물 또는 데모성격의 건물에만 반영되던 미래의 기술 분야로 간주되어왔다. 하지만 10년 남짓 지난 지금 우리 주변에서 가장 흔하게 접할 수 있는 용어 중의 하나가 친환경, 지속가능, 그린, 에코 등 이며, 최근 많은 건설사가 고민하고 있는 가장 중요한 이슈가 친환경 건축 관련 기술이 되어버렸다. 최근 유가의 급등세 보다는 더디다 할 지라도 몇 년 사이에 벌어지고 있는 제도적, 사회 경제적 변화 동향을 돌이켜 볼 때 건축계 또한 매우 빠른 속도로 변해가고 있으며, 부지불시간에 유가등급과 같이 변화된 환경에 놀라는 시기가 곧 도래할 것이다. 오랜 기간 에너지 및 친환경 관련 요소기술의 개발, 정부의 지원제도 확대, 보급 강화 등 각종 노력을 통해 이제는 건축 설계분야에서도 친환경건축물에 대한 저변이 크게 확대되었다고 볼 수 있다. 하지만 실상 우리주변에서 제대로된 친환경 건축물을 실제로 보고자 한다면 두손으로 꼽기도 힘들 정도인 사실에 놀라게 될 것이다. 이러한 배경하에 이번 연재에서는 그동안 오랜기간 떠들고 노력했음에도 불구하고 실제 제대로된 친환경 건축물을 우리 주변에서 찾기 힘든 이유를 건축실무자 측면에서 재고해 보고, 이에 대한 새로운 해결방안을 모색해 보는 계기를 갖고자 한다. 특히 많은 친환경 건축기술 중 최근 선진국을 중심으로 가장 큰 이슈가 되어 있고, 또한 건축사 입장에서 쉽게 접근하기 어려운 기술분야인 신재생에너지 건축응용 측면에서 다양한 최신 기술 및 실질적 접근방법과 사례를 주제별로 제시하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.1483-1489
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• 2015

The purpose of this study is to investigate the changes in citizens' perceiving urban landscape. To this end, the citizens' perceptions of urban landscape of Gimhae were surveyed two times in 2003 and 2011. To examine the statistical significance, the frequency analysis, the chi-square test were applied. There were small changes of opinion between two periods caused by the change of city form, an increase in interest in the living environment, environmental protection and so on. The interest of the citizens of the landscape were high. Citizens showed a negative feedback with respect to economic sacrifice. So, regulation causing citizens' economic loss should be avoided and It is effective to establish policies to support and induction. The results of this study are intended to be used as a reference to the planning urban landscape.