• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.117-120
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• 2003

PON (Passive Optical Network) is an emerging local subscriber access architecture that provides more bandwidth and services to subscriber than DSL (Digital Subscriber Line and HFC (Hybrid-Fiber Coaxial) network. A PON is a point-to-multipoint optical network with no active elements in the signals' path from source to destination. Advantages of using PON for a subscriber access network include large coverage area, reduced fiber deployment, multicast and broadcast capabilities, reduced cost of maintenance (due to devices being passive), and ease of upgrades to higher bit rate or additional wavelengths. PON uses WDM (Wavelength Division Multiplexing) technique that transmits the downstream and upstream data at each different wavelength. For transmitting the CATV (Community Antenna television) service through PON network, we give out additional wavelength. This study shows the available TPS (Triple play service) architecture using CATV overlay EPON (Ethernet PON) architecture and analyzes the effects of EPON-based CATV transmission by measuring the power loss fur each wavelength and the power range of the available analog wavelength and RF.

• 한국컴퓨터정보학회논문지
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• 제21권11호
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• pp.159-166
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• 2016

Compiler course is one of the important courses in computer science. It requires more efficient learning environment because of its large coverage scale and complexity. One of its solutions is to provide the integrated development environment for educational compilers which is enable to give practice-oriented class and enhance student's interest. This paper presents the code generation support system developed in an integrated development environment of educational compiler. Our system helps students to understand the process of code generation and visualizes the relation among the source language, AST, and the target language. It makes students develop their own compilers more easily.

• 한국표면공학회지
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• 제29권5호
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• pp.350-356
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• 1996

This paper presents VHF-Plasma Enhanced Chemical Vapor Deposition (VHF-PECVD) of Ti/TiN with silne reduction process, using $TiCl_4$ source. VHF plasma, which is denser than a conventional RF plasma, produces a large number of radicals. Silane reduction process, which supplies silane radicals, more promotes dissociation of Ti-Cl bond than a conventional hydrogen reduction process. therefore, the VHF-PECVD with silane reduction process forms high quality Ti/TiN films, which have low level of Cl content(<0.2 at.%). In result, the resistivity for Ti or TiN is less than 200$\mu$$\Omega$cm. The surface morphology of Ti film is very smooth. The structure of TiN film is amorphous. Furthermore, excellent step coverage for the films is obtained.

• 한국물환경학회지
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• 제16권4호
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• pp.491-499
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• 2000

Effluent concentration estimation equations for treatment wetland were reviewed with 3 -year experimental data. Four equations from USEPA, WPCF, Kadlec and Knight, and this study were applied to the over 100 data points of 1996 to 1999 study at the pilot plant in Konkuk University. The system was a subsurface flow type and consisted of 60cm depth of sand and reeds, and it worked continuously including winter with domestic sewage from school building. Generally, all the equations demonstrated reasonable agreement with experimental data and they could be used for design process if selected carefully. Among them, the equation from this study showed the best fit for the data. The reason might be not only the equation was derived from the experimental data, but also it included plant coverage parameter in the equation while others did not Plant coverage was proved to be an important parameter in the prediction of the treatment wetland system, and its inclusion in the estimation equation could improve the accuracy. Although existing equations could be used in the wetland design, pilot plant experiment for the anticipated condition and subsequent equation development can provide more reliable equation. It takes time to obtain meaningful data from wetland system. Therefore, timely onset of well organized study is recommended before large scale application of treatment wetland system to either point or nonpoint source pollution abatement.

• 한국정보과학회논문지:소프트웨어및응용
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• 제36권9호
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• pp.706-717
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• 2009

웹 어플리케이션은 프레임워크가 제공하는 라이브러리를 재사용해서 구현하며, 다계층 아키텍처를 갖는다. 또한 사용자 요청을 처리하기 위해, 화면에서 시작하여 해당 웹 어플리케이션 구성 컴포넌트를 실행하고 데이터베이스를 경유하여 다시 화면으로 돌아오는 실행 흐름, 즉 비즈니스 로직을 갖는다. 웹 어플리케이션을 효과적으로 테스트하기 위해서는 이러한 웹 어플리케이션의 특징을 반영하는 테스트 방안이 필요하다. 본 논문은 웹 어플리케이션 테스트를 위해 사용자 화면으로 테스트를 수행하되, 웹 비즈니스 로직 상의 인터페이스 테스트 커버리지로 검증하는 방법을 제안한다. 이를 자동화한 테스트 도구인 Testopiacov를 통해 웹 어플리케이션을 테스트하고 그 결과를 통하여 제안하는 웹 어플리케이션 테스트 방법을 분석한다.

• 한국콘텐츠학회논문지
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• 제20권9호
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• pp.195-207
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• 2020

본 연구는 지난 2016년 2월 국회에서 '국민보호와 공공안전을 위한 테러방지법안' 통과를 저지하기 위해 야당이 진행했던 필리버스터 관련 보도 과정에서 진보와 보수 성향 언론사들이 어떤 보도 프레임과 정보원을 주로 활용했는지, 그리고 어떤 키워드와 주제를 활용해 관련기사를 작성하는지에 대해 비교 분석하였다. 신문사의 이데올로기적 지향점이 보도에 미치는 영향을 비교 분석하기 위해 본 연구는 진보성향 신문사인 <한겨레신문>, <경향신문>, <오마이뉴스>와 보수성향 신문사인 <조선일보>, <동아일보>, <중앙일보>를 연구대상으로 선정했다. 연구결과, 보도 프레임에서 진보와 보수언론사 간에 가장 뚜렷한 차이를 보이는 것으로 나타났는데, 보수언론은 필리버스터를 부정적인 정치행위라고 강조해 보도한 반면, 진보언론은 필리버스터를 긍정적인 정치행위라고 보도해 명확한 차이를 보였다. 보도기사에서 활용한 키워드 역시 보수언론은 '방해'라는 키워드를 많이 사용한 반면, 진보언론은 '독소조항'이라는 키워드를 많이 언급한 것으로 나타났다. 결국, 이 연구를 통해 언론사들이 정치적인 사안을 보도할 때 자사가 가지고 있는 정치적 성향에 의해 영향을 받는다는 사실이 증명되었다.

• 한국언론정보학보
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• 제81권
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• pp.225-271
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• 2017

본 논문은 KBS의 언론적 성격을 파악하기 위해 부동산 뉴스 생산 과정을 분석했다. 부동산 분야는 국민의 기본권인 동시에 경제적 사회적 이해가 충돌하는 공적 의제라는 점에서 연구 대상으로 선택했다. 분석 결과 첫째, KBS 뉴스룸은 뉴스 선별 과정에서 시민에 대한 봉사보다 시청률을 강조하는 경향을 나타냈으며 이는 단편적이고 피상적인 뉴스를 제공하는 원인이 되는 것으로 분석되었다. 둘째, KBS 뉴스룸은 정부 출입처의 보도 자료에 의존하는 취재 관행 속에서 정부 발표를 부각시키고 정부의 입장을 지지하는 역할을 수행하고 있었다. 셋째, KBS 뉴스는 1분 30초 이하의 도식적 뉴스 형식의 한계를 유지하고 있으며 정부 정책에 대한 감시와 다양한 여론 전달이라는 공익적 역할은 경시하고 있다. 결론적으로 KBS는 공영 방송을 표방하고 있지만 오랜 역사에 걸쳐 정착되어온 내부 관행을 통해 닫힌 공보 뉴스를 생산하고 있으며 국민 전체를 대표하고, 공적 의제에 대한 토론장의 제공과 다양한 목소리를 반영하기 보다는 정부를 홍보하고 특권층을 옹호하는 '공보 방송 모형'에 부합되는 것으로 해석되었다.

• 한국인구학
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• 제12권1호
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• pp.19-29
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• 1989

It is well known that vital statistics is of great importance as basic data for establishing various range of national policies. Especially, vital statistics is important among demographic information for monitoring and evaluating the population policy, for constructing life table, for making population projection, and for studying various aspects of the society. In principle, the production of vital statistics is based on the registration system. It is, however, still observed that there are some limitations in utilizing fully the registration system due to the inherent problems such as problems in its coverage, accuracies and timeliness. Thus, as an alternative, many countries conduct survey on vital statistics in order to supplement the registration system and obtain in-depth data. Korea is no exception in this aspect. The National Bureau of Statistics carries out the so-called Continuous Demographic Survey. This is a kind of multi-round retrospective survey, covering 32, 000 households and having reference period of one month. The survey has also characteristics of multi-subject sample. Thus, surveys on economic activity status of population, house-hold income & expenditure, and social indicators are together conducted with the same sample. It is, however, found that the survey itself tends to have some quality problems. Especially, the quality problems connected with field data collection are summarized as coverage error, non-response error and response error. Although it is inevitable not to be free from these errors, we should make all our efforts to reduce the errors. The probable schemes pointed out in this paper are as follows : 1) the strengthening formal quality control activities, 2) the review of the survey method, i. e., the combining interview method with mail-sending and mail-back method or pick-up method, 3) well documentation for various cases found in every stage of data collection, and 4) the strengthening the analytical activities. It is, also, emphasized that sincerity of planners and interviewers is the most important factor among other things.

• 한국환경복원기술학회지
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• 제15권6호
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• pp.69-77
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• 2012

This study observes the purchased lands in riparian areas of Suncheon City region and proposes a reasonable management method. For the study, the site surveying and analysis on the neglected purchased lands is executed, then, based on the site analysis result, the appropriate management method for each neglected purchased land is established. Each management method is approached from the ecological restoration perspective. According to site surveying and analysis of the neglected purchased lands, most of the sites were bare and agricultural lands. The reason for this is thought to be as when purchasing a land, the areas with higher nonpoint source pollution are bought preferentially. As for the dominant species coverage, 26% ($364,000m^2$) of the total neglected purchased land area in Sucheon City was covered with the dominated species, and for the exotic species coverage, 17% ($232,000m^2$) of the total neglected purchased land area in Sucheon City was covered with the exotic species. The survey site constituted of five different invasive species such as Japanese Hop (Humulus japonicus), Daisy Fleabane (Erigeron annuus), and Evening Primrose (Oenothera odorata). As for the natural succession on site, about 47% of the area showed poor natural succession process. The reason for this outcome is understood as having a lack of appropriate management for purchased lands. Based on the site surveying and analysis, especially the current management state of the and its location, the research site was categorized into preservation, restoration, and improvement sites. During the establishment of the ecological riparian belt, the comprehensive management for preservation, restoration, and improvement of the purchased lands should be executed.

• 한국물환경학회지
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• 제24권6호
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• pp.709-717
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• 2008

The field scale experiment which is constructed with four sets (0.88 ha for each set) of wetland (0.8 ha) and pond (0.08 ha) systems was performed to examine the effect of plant coverage on the constructed wetland performance and to recommend the optimum development and management of macrophyte communities. After six growing seasons of wetlands, plant coverage was about 100%. And the concentration of DO showed low value (1.0~5.4 mg/L). This is caused by a blighted plant consumed dissolved oxygen with decay in water column. As the result, water column went to be anaerobic conditions and T-N removal rate are 58~67%. Dead vegetation increased nitrogen removal during winter because it is a source of organic carbon which is an essential parameter in denitrification. However, wetland released phosphorus caused by a blighted plant and accumulation, the removal rate of phosphorus might be decreased. To rise of DO concentration, the three open-waters were constructed in cell 3 and 4. Cell 3 has two open-waters (width 10 m, depth 1.8 m) and cell 4 has one open-water (width 20 m, depth 1.8 m). As the result, DO concentration and treatment efficiency of nutrient and BOD were improved. In case that constructed wetland is operated for a long time, physical circulation structure such as open water help continuous circulation of aerobic and anaerobic conditions. Through the constructed open-water, treatment efficiency of phosphorus and nitrogen in wetland could be improved effectively.