• 한국환경복원기술학회지
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• 제7권4호
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• pp.98-109
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• 2004

This study was conducted to develop revegetation methods for the restoration of the steep slopes by recycling of bark compost and mushroom media. In general, bark compost and mushroom media can be used as soil media for the restoration works, because they can increase infiltration of rainfall and give enough porous to breathe and elongate for the root growth as well as environmental value. This experiment was carried out to know the effect of soil media composed by different ratio of mushroom media for the restoration of steep rock-exposed slopes, and to certificate how soil media(PEC) will be effective to germinate and grow for native plants. The main results of the study are summarized as follows; 1. In percent coverage, the soil media PEC1 is more valuable than PEC2. The seed mixtures recommended by Government of Transportation and Construction can be used at PEC1 and PEC2, but it will be more useful if the total amount of seed are reduced and seed mixtures are altered in a direction of native plants. 2. The soil media is under 20 mm tested by Yamanaka Hardiness Tester which is available for the seed germination and growth. 3. The surface cracks are not occurred in PEC1 and PEC2, but more than 30 cracks per 1 square meter are occurred at soil media which is constructed by normal soil-seed-fertilizer hydro-seeding methods. 4. The soil moisture contents are over 20 percent level during 15 day. Such moisture content in soil media will be effective for the plant growth. By using Terra-Control, PEC can maintain enough soil moisture. 5. The eroded soils from $60^{\circ}$ slopes by artificial rainfall with the intensity of 20 mm/hr in one day after seeding are estimated under 1%. By the results of erosion test, it comes to the conclusion that soil media of PEC can be adapted at steep rock exposed slopes.

• 한국컴퓨터정보학회논문지
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• 제12권4호
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• pp.137-148
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• 2007

본 논문은 오늘날 디지털 기술의 발전으로 모든 미디어가 디지털로 빠르게 전환되고 있는 상황에서 전환이 이루어지고 있지 않은 우리나라 라디오 매체의 디지털 전환을 위한 효율적인 방안은 무엇인지에 대해 세계 각국의 자료조사와 전국 분포 2,000명 수용자를 대상으로 한 "라디오방송 청취 행태"에 대해 설문 조사 자료 분석을 바탕으로 국내에 가장 효율적인 전환방안은 무엇인지 제시코자 한다. 라디오 매체는 이동성 개인성, 현장성, 광역성, 즉시성이 강한 매체 특성을 갖고 있으며, 무엇보다 공익성이 강한 매체로 앞으로도 지속적으로 서비스가 필요한 매체이다. 따라서 라디오 매체가 디지털미디어 환경에서 경쟁력을 갖기 위해 디지털로의 전환이 시급한 과제라 할 수 있다. 본 논문에서는 라디오방송의 디지털전환 시 전송방식은 DRM으로, AM방송과 표준FM, 국내방송과 국제방송을 분리하여 추진하고, 향후 복합형수신기 개발과 표준제정이 필요하다는 정책제언을 하였다.

• 한국정보통신학회논문지
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• 제25권5호
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• pp.731-740
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• 2021

본 연구는 LDA 토픽모델링 분석을 적용하여 한국 내 세 번의 코로나19 대유행 시기를 기준으로 마스크와 관련된 뉴스 빅데이터를 수집, 분석하였다. 분석 결과 각 시기별 마스크라는 단어를 중심으로 언론보도가 마스크 정책과 관련된 주제에서 사건사고 위주로 바뀌어가는 것을 실증적으로 살펴볼 수 있었다. 즉 제1차 시기의 경우 마스크 생산과 공급이, 제2차 시기에서는 마스크 착용 의무화 및 관련 사건사고가, 마지막인 제 3차 시기에는 주로 사건사고 위주로 토픽이 다뤄진 것을 확인 할 수 있었다. 해당 연구를 통해 마스크 공급, 확보, 착용 외 다른 보건정보에는 상대적으로 소홀했을 가능성을 확인할 수 있었으며, 제2,3차 시기 보도가 사건사고에 치우친 부분은 향후 언론보도의 접근성 및 태도에 대한 개선점이 있음을 시사한다. 따라서 코로나19에 보다 효과적으로 대응하기 위해서는 보다 거시적이고 사회 전체적인 논의가 진행될 수 있도록 언론보도가 변화해야 할 것이다.

• 한국환경복원기술학회지
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• 제7권3호
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• pp.86-95
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• 2004

This study was conducted to develop recycle revegetation methods for the restoration of the steep slopes by using fresh wood chip from construction sites. In general, the fresh wood chips can be used as soil media for the restoration works, because they can increase infiltration of rainfall and give enough porous to breathe and elongate for the root growth as well as economic value. The experiment was carried out to compare the effect of fresh wood chips from different mixing with soil, organic material and macromolecular compound which used for slope restoration works conducted by Hyunwoo green(Ltd.). The main results by monitoring for two years are summarized as follows; 1. The soil media made with low percentage of fresh wood chip covered quickly by herb plants. Especially, the soil mixture Type C (wood chip 20%) showed 80 percent ground coverage within two months after seeding. 2. The soil mixture type E (wood chip 40%) and type F (wood chip 50%) which contains more fresh wood chips than soil type C was under 30 percent ground coverage because wood plants are germinated well. If the restoration works aims at making forest, then the soil type E and F would be recommended than using soil type C. 3. Among the woody plants, Ailanthus alfissima, Pinus rigida, Pinus densiflora, and Albizzia julibrissin showed high percentage of germination rates and vigorous growth. In case of shrubs, Lespedeza cyrtobotria and Indigofera pseudo-tintoria scored high percentage of germination rates. 4. In native plants, Chrysanthemum indicum, Artemisia princeps, Lutos corniculatus and Imperata cylindrica showed high percentage of appearance. In case of introduced herbs, Coreopsis lanceolata, Coreopsis tinctoria and Oenothera oborata grew so vigorously. 5. The soil types which including fresh wood chips over 30-40 percentage showed the most diverse plant composition and the most effective germination rates and growth pattern with woody plants. 6. This works to develop recycle revegetation methods using fresh wood chips need more efforts for monitoring the exact effect of fresh wood chips as the soil media.

• 한국언론정보학보
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• 제25권
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• pp.65-102
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• 2004

본 연구는 위도 핵폐기물 처리장 건설이라는 사회 갈등사안에 대한 언론의 뉴스 구성방식과 뉴스보도에 나타난 속성을 내용분석을 통해 도출하고, 이러한 언론의 의미구성방식이 수용자에게 미치는 영향을 2차 의제설정 효과를 통해 분석하였다. 먼저, 조선일보와 한겨레, 오마이뉴스의 위도 핵폐기장 관련 기사를 내용분석한 결과 세 신문 모두 쟁점중심보다는 갈등중심 보도에 치중하고 있는 것으로 나타났으며, 위도 핵폐기장을 둘러싼 9가지 쟁점사항 중 주민의견수렴 절차와 주민보상 문제에 편중된 형태로 뉴스의 속성을 구성하고 있었다. 또한 2차 의제설정 효과의 기정대로, 미디어의 관점에 따라 대상의 여러 속성들 가운데 특정 속성을 강조함으로써 속성의 현저성이 나타난다는 사실이 관찰되었다. 이러한 내용분석 결과를 근거로 실험을 실시한 결과에서는 뉴스기사에서 강조된 속성이 인지적 측면과 감성적 측면에서 수용자들의 인식에 유의미한 영향을 미치는 것으로 나타났다. 그러나 이러한 속성의 전이가 수용자의 의견 형성에 미치는 영향과 부차적 효과는 통계적으로 유의미한 결과가 나타나지 않았다. 이는 위도 핵폐기장 문제가 언론을 통해 많이 노출된 상태에서 이미 수용자의 의견이 상당부분 형성되어 있었기 때문인 것으로 추측된다. 본 연구의 결과는 뉴스의 속성이 수용자에게 전이되어 인지되고, 이를 통해 수용자의 의견 형성에 영향은 미친다는 2차 의제설정 효과를 부분적으로 지지하는 것이다.

• 한국환경복원기술학회지
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• 제8권4호
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• pp.81-90
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• 2005

This study aimed to address problems and suggest solutions in applying seed mixture design criterior of the slope revegetation works according to "The guidelines of Slope revegetation design and construction" proposed by the Ministry of Construction and Transportation. To do this, the planting thickness was set to be the same 2cm while the composition of seeds was made different, which was planted in artificial slopes and fields. The main results were summarized as follows. In the test, when applying the provisional standards of the plant mixtures proposed by the Ministry of Construction and Transportation, tree seeds and native plants were found poor coverage effect in the early stage in all test plots due to introduced grasses. This was because introduced winter grasses which grew well in the early stage, could grow densely, so it might hamper the growth of other plants. Therefore, it was found desirable that standards for seed mixing should be adjusted down by 10% and the ratio of introduced grasses in the mixture should be lowered to 25% while native plants should increase to 20-25%.

• 대한방사선기술학회지:방사선기술과학
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• 제41권3호
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• pp.231-240
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• 2018

Automated breast ultrasound (ABUS) equipment is a new innovative technique for 3D automatic breast scanning, but limited for the examination in the concave axillary region. The purpose of this study was to determine feasible candidate materials for the ultrasonic wave propagation media in ABUS, enabling the evaluation of the axillary region. Ultrasonography was performed using an ABUS system ($Invenia^{TM}ABUS$, GE, USA) on the ultrasound-specific phantom (UC-551M-0.5, ATS Laboratories, USA) covered by different candidate materials. The validity of feasible candidate materials was evaluated by image quality. Three independent radiological technologists, with more than 10 years of experience, visually assessed on the images. The inter-observer agreements according to the candidate materials were tested using Cronbach's alpha. Unenveloped solidified carrageenan can be a feasible material for the use of ABUS with excellent test reliability. Therefore, the coverage of the axillary region with carrageenan may be effective for ABUS which was originally developed for the convex anatomic structure as female breast.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.244.2-244.2
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• 2011

We introduce a novel and robust method for the preparation of nanocomposite multilayers, which allows the excellent photoluminescent (PL) properties as well as the accurate control over the composition and dimensions of multilayers. By exchanging the oleic acid stabilizers of CdSe@ZnS quantum dots (QDs) synthesized in organic solvent with 2-bromo-2-methylpropionic acid (BMPA) in the same solvent, these nanoparticles were be alternately deposited by nucleophilic substitution reaction with highly branched poly(amidoamine) dendrimer (PAMA) through layer-by-layer (LbL) assembly process. Our approach does not need to be transformed into the water-dispersible nanoparticles with electrostatic or hydrogen-bonding groups, which can deteriorate their inherent properties, for the built-up of multilayers. The nanocomposite multilayers including QDs exhibited the strong PL properties achieving densely packed surface coverage as well as long-term PL stability under atmospheric conditions in comparison with those of conventional LbL multilayers based on electrostatic interaction. Furthermore, we demonstrate that the flexible multilayer films with optical properties can be easily prepared using nucleophilic substitution reaction between bromo and amino groups in organic media. This robust and tailored method opens a new route for the design of functional film devices based on nanocomposite multilayers.

• Journal of Public Diplomacy
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• 제1권1호
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• pp.80-110
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• 2021

Public diplomacy (PD) scholars tend to consider two main principals: the country or agent that conducts PD (Actor A), and target groups in the host country in which PD is conducted (Actor B). The field currently lacks theories of how communications between Actors A and B can be disrupted by a third party, such as a group of motivated trolls, an organised advocacy group, or a hostile country and its agents. The purpose of this article is to outline some theoretical considerations for how the PD research field might move away from a two-actor model of PD to one in which disruption is part of the discussion. The case study explores the activities of an interest group called Media Watchdogs of Sweden (MEWAS). MEWAS was a group of around 200 members who met in a hidden Facebook group to coordinate off-platform activities aimed at influencing perceptions of how the Swedish government handled the COVID-19 pandemic in the eyes of foreign governments, researchers, decision-makers, and media. Much critical news coverage in the international press has been linked to this group. Unpacking some of MEWAS' activities, which can be considered a quite typical mixture of legitimate and illegitimate communication techniques used by activist groups, can help to shed light on some difficult questions regarding disruption in PD.

• 스마트미디어저널
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• 제9권4호
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• pp.73-80
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• 2020

With the advent of the Internet era, consumer lifestyles have been changed tremendously, and mobile payment has carried out an increasingly extensive coverage of the people's life trajectory. Taking the design of the mobile payment interface as an example, we use a conjoint analysis method to survey college students in Guangxi, where questionnaires are collected from 270 people in different groups according to gender. The method separates the attributes that affect consumer choice of mobile payment interface design and the utility value of the attribute level to analyze consumer needs and preferences, and then obtains consumers' potential evaluation criteria for mobile payment interface design. The results of the study show that the attributes that influence consumers' choice of mobile payment interface design are, in order of preference: page layout, identification convenience, verification, module distribution, entertainment, and information encryption. Consumer groups of different genders show differences in their preferences in the mobile payment interface design and Consumer needs reflect consumer psychology. Several findings are obtained on the consumers' preferences on the mobile payment interface design, which may be used to improve future design processes.