• Korean journal of applied entomology
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• v.34 no.4
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• pp.321-327
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• 1995

This study was conducted to determine the winter ecology of the small brown planthopper (SBPH), laodelphax striatellus Fallen, in Milyang, east Kyungsangnamdo province. The age distribution in the overwintering SBPH population varied according to collection dates. In early December, the population distribution was 60% 4th instar, 30% 3rd instar, 6% 5th instar, 3.4% 2nd instar with very few adults and 1st instar. In early March 5th instars had the highest propotion (47-50%) with 4th instar 44-46%. In early April the adult population was 75-81% of the population. The averaged nymphal instar converted the age distribution of he overwintering SBPH in to the into the numerical values tended to increase continuously. However, there were some differences in the averaged nymphal instar of overwintering SBPH annually and these differences resulted from different age distribution of the overwintering SBPH due to different annual temperature fluctuations during overwitering periods. The weight of the overwintering SBPH increased continuously during overwintering periods. The collection density of the overwintering SBPH population was significantly higher on the levee than in the barley field. Percent nymphal parasitism by haplogonatopus atratus in the overwintering SBPH population averaged about 21% regardless of overwintering years.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.534-536
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• 2000

EJB의 애플리케이션 개발환경은 객체지향 분산처리를 지원하는 컴포넌트를 개발하고 분산 배치를 위한 컴포넌트 구조이다. EJB를 이용하여 개발한 애플리케이션은 컴포넌트 모델의 개념을 결합하여 비즈니스 프로그램의 개발이 쉽도록 단순화시켰으며, 보안성, 리소스 풀링, 영구성, 동시성, 트랜잭션 무결성을 자동적으로 해결해 준다. 본 논문에서는 이러한 개발환경에서 EJB 컴포넌트가 충분한 유연성을 가질 수 있도록 기능별로 효율적인 빈의 유형을 추출하는 방법을 찾고자 하였으며, EJB 빈의 유형별 특성에 따라서 빈 유형을 쉽게 분류할 수 있는 방법을 표준화하여 시스템 분석 및 설계시 반영할 수 있도록 하였다. 본 논문의 제안모델은 단계별로 전 단계의 모델을 재사용하고, 객체를 쉽게 빈으로 매핑할 수 있도록 표현계층, 비즈니스 로직계층, 데이터계층으로 계층화하여 객체를 배치함으로써 빈의 유형을 쉽게 추출할 수 있는 방법을 제공한다.

• Journal of Digital Convergence
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• v.13 no.8
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• pp.9-20
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• 2015

To derive a check list of a borrowed city phenomenon, this discussion, through two cities subway OOH advertising in door, compared for convergence by segment analysis. First, discussions considered to be close to the topic of this discussion were arranged and summarized. Seoul and London were selected, and both sides of subway train doors in two cities selected, their states pictured and the images analyzed. As a result of comparison, in case of Seoul subway, the boundary between public information and commercial information(outdoor advertising) was very vague, so the borrowed city phenomenon was very generally analyzed. However, In case of London subway, its result was very contrary to that of Seoul. Eventually, Subway train doors of Seoul city as a borrowed city extracted check points of height, size, color, interval, space and permanency. Therefore in order to study serious discussion this contribution is necessity to limit thoughtless OOH advertising by these checklists in Korean cities.

• The Korean Journal of Applied Statistics
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• v.1 no.2
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• pp.82-90
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• 1987

모든 과학기술지식은 객관성을 지닌 관찰과 실험과 측정에 의해서 이루어진다. 이렇게함으로써 과학기술지식은 재현성과 영구성을 가져오게 되며, 올바른 전승과 누적적 발전을 가져오는데 이 과학기술지식의 질서체계를 유지하는데 근본적인 역할을 하는 것이 표준이다. 시간, 길이, 온도, 무게 등의 기본 측정단위와 광속, 중력 등의 물리화학적 상수, 법정계량단위, 각종 공업 규격, 안정 규정 등 수 없이 많은 표준은 효과적인 공동 인식과 객관적 판단의 기준으로 활용되고 있다. 현대의 과학기술이 다양하게 발전하고 이에 따라 우리의 생활도 더욱 복잡한 구조를 이루면서 표준에 대한 필요성도 더욱 높아가고 있다. 표준에 대한 깊은 생각없이도 우리는 자동차에 주유할때 표준단위를 통해 원하는 분량을 말하며, 카메라의 필름 종류를 선택할 때도 국제표준기구(ISO: International Standards Organization)의 규격을 사용하는데 익숙해져 있다. 이렇게 표준은 우리 일상생활과 밀접한 관계에 있으나 소비자 입장에서는 그 가치를 절실히 느끼지 못한 것이 사실이며 표준이 없음으로 해서 일어나는 불편과 혼란에 대해서는 무관심한 것이 사실이다. 일상생활에서 일어나는 표준의 역할을 우리가 잘 이해한다면 표준이 왜 필요한가를 쉽게 인식하게 될 것이다. 최근 정보산업이 새로운 물결로 사회전반에 영향을 미치고 있으며 이에 따라 정보의 수집, 가공, 저장 및 배포의 처리 과정에서도 제반 표준화의 필요성이 크게 대두되었다. 그 결과로 최근 10여년간에 수백종의 기술기준, 지침서 및 기본/기능 표준규격이 제정되어 왔다. 이와 같이 어떤 특별한 영역에서의 표준에 대한 요구가 있을 때 관련 규격이 제정되게 된다. 표준의 제정을 위한 다음 단계는 그 주제에 관한 표준(또는 규격)개발에 관심을 가진 사람들이 모이는 일일 것이다. 통계분야에서도 몇가지 표준화 활동이 ISO 를 중심으로 진행되고 있다. 예를 들면 실험과 검증 결과의 표현과 해석, 표본추출 방법 등에 관한 것으로 이들은 통계의 응용분야에서 꼭 필요한 표준이다. 구체적인 예로서 우리나라 국민의 표준체위값을 설정하기 위하여 측정조사할 때 측정방법 뿐 아니라 표본추출 방법과 통계자료 처리과정의 표준화가 이루어 지지 않는다면 각 기관에서 조사 발표하는 체위관계 자료가 상이하여 국가기관의 통계자료에 대한 신뢰성이 저하되고 통계값을 이용하여 의류, 신발 등의 제품을 제조하는 산업계에 혼란을 야기시킬 수 있다. 본 고에서는 ISO의 활동을 정보처리 분야에 초점을 맞춰 간략하게 설명하고 통계분야의 국제 활동을 비전문가인 필자들이 아는대로 소개하는 한편 국내활동의 필요성을 강조하여 관련 기관, 학계 및 산업계 관련전문가들의 ISO 국내활동 참여를 제의하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.12
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• pp.1837-1842
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• 2010

Studies on alternative energy have been carried out for many decades because of the accelerated exhaustion of fuel. While the efficacy of solar cells is still low in comparison with that of nuclear power, solar cells have been highlighted as potential sources of alternative energy because they are environmentally friendly and have a source of unlimited energy, namely, the sun. In this study, the optimum efficiency of solar cells was simulated as a function of the incident angle of sunlight and the geometric shapes of patterns using MATLAB and MathCAD software. The foremost efficiency of the solar cell was found to be 1.10 when the thickness and width of the patterns were in the range 25-$50{\mu}m$ and 50-$100{\mu}m$, respectively. To achieve the 25 um thick layer, 100,000 cps silver paste and 500 um orifice tip has been successfully implemented with Micro-Dispensing Deposition Writing.

• Journal of the Korean Association of Geographic Information Studies
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• v.3 no.1
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• pp.57-68
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• 2000

The purpose of this study is to find the most effective method of the coding methods by linking the attribute information with the digital map in Taegu metropolitan city. This study was also a precedent plan for street trees management information system and the coding schemes for street trees management information system could be summarized as follows; First, this study extracted 11 coding factors for expressing the position of street trees. Second, 11 coding schemes were made out of these coding factors and applied to the digital map(1:500). Third, two methods of 11 coding schemes were selected for street trees management information system of Taegu metropolitan city. The one was the method which applied serial numbers according to the block name. The other was the method utilizing the concept of 'dynamic segment'. Finally, this study will be the first step for the computerization and management of the street trees information and this computerized data will do for the management efficiency of the street trees on internet.

• Journal of KIISE
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• v.42 no.1
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• pp.107-113
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• 2015

In a database system, updates on pages that are made by a transaction should be stored in a secondary storage before the commit is complete. Generic secondary storages have volatile DRAM caches to hide long latency for non-volatile media. However, as logs that are only written to the volatile DRAM cache don't ensure durability, logging latency cannot be hidden. Recently, a flash SSD with capacitor-backed DRAM cache was developed to overcome the shortcoming. Storage devices, like those with a non-volatile cache, will increase transaction throughput because transactions can commit as soon as the logs reach the cache. In this paper, we analyzed performance in terms of transaction throughput when the SSD with capacitor-backed DRAM cache was used as log storage. The transaction throughput can be improved over three times, by committing right after storing the logs to the DRAM cache, rather than to a secondary storage device. Also, we showed that it could acquire over 73% of the ideal logging performance with proper tuning.

• International Area Studies Review
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• v.15 no.3
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• pp.55-76
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• 2011

In this paper, we estimate a model that incorporates key features of business cycles, co-movement among economic variables and switching between regimes of expansion and recession, to aggregate quarterly data for the NAFTA region. Two common factors reflecting the permanent and transitory components of the business cycle in the region, along with the turning points from one regime to the other, were extracted from the data by using the Kalman filter and maximum likelihood estimation approach of Kim (1994). Estimation results confirm that a typical aspect of business cycles are also observed (i.e., recessions are steeper and shorter than recoveries) in the region, and that both co-movement and that regime switching are found to be important features of the business cycle. The two common factors produce sensible representations of the trend and cycle, and the estimated turning points are in line with independently determined chronologies. It also turns out that the degree of synchronization between the NAFTA region and Korea, has significantly increased since the entry into force of the NAFTA.

• Journal of Digital Convergence
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• v.17 no.1
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• pp.313-317
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• 2019

Installation art is another methodology of modern art appeared in 1970's. Installation art does not seek for a particular ideology or specific form to express, but rather it endeavors to produce a work produced by mutiful media convergence and integration. Therefore, this leads to inspire new cognition on ordinary places. Installaton art is strongly related with public art in terms of most works are to be exhibited. Thus from this point of view, installation art contains public art which aims to better communication among people, nature and artificial things. Eventually, temporary installation art contains communication and convergence of people and object in public places.

• Journal of the Korean Society for Marine Environment & Energy
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• v.14 no.1
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• pp.51-64
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• 2011

Carbon dioxide Capture and Storage (CCS) is one of the key players in greenhouse gas (GHG) reduction portfolio for mitigating climate change. CCS makes simultaneously it possible not only to reduce a huge amount of carbon dioxide directly from the emission sources (e.g., coal power plant) but also to maintain the carbon concentrated-energy and/or industry infrastructure. Internationally, the United Nations Framework Convention on Climate Change (UNFCCC) is dealing the agenda for considering the possibility of including CCS project as one of Clean Development Mechanism (CDM) projects. Despite its usefulness, however, there are the controversies in including CCS as the CDM project, whose issues include i) non-permanence, including long-term permanence, ii) measuring, reporting and verification (MRV), iii) environmental impacts, iv) project activity boundaries, v) international law, vi) liability, vii) the potential for perverse outcomes, viii) safety, and ix) insurance coverage and compensation for damages caused due to seepage or leakage. In this paper, those issues in considering CCS as CDM are summarized and analyzed in order to suggest some considerations to policy makers in realizing the CCS project in Korea in the future.