• 한국초지조사료학회지
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• 제21권1호
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• pp.39-44
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• 2001

대관령지역에서 사료용 옥수수 품종의 생육특성과 생산성을 비교 검토하여 생산성이 높은 품종을 농가가 선택할 수 있는 기초자료를 얻고자 국내에서 육성된 수원 19호를 대비품종으로 하고 현재 많이 재배되는 8개 장려품종을 공시하여 1999년도에 난괴법 3반복으로 대관령지소(해발 800m) 포장에서 수행한 결과를 요약하면 다음과 같다. 생육특성 중 간장은 DK501, GL499 품종이 각각 180, 198cm로 가장 적었고 그 외 품종은 230cm 내외로 품종간에 큰 차이가 없었다. 착수고는 간장이 적은 품종에서 낮게 나타났고 P3525, DK729는 각각 120, 116cm로 다른 품종에 비하여 10~l5cm 높았다. 경직경은 수원19호에 비하여 DK501를 제외한 전 품종에서 굵었으며 특히 P3144W가 24.2cm로 가장 굵었다. 생엽수는 숙기가 늦은 DK729, G4743이 각각 12.0, 12.3개/주로 가장 많았다. 출사기는 8월 10일~20일로 품종간에 10일 차이로 매우 크게 나타났다. 가장 빠른 품종은 DK501로 8월 10일, 가장 늦은 품종은 G4743으로 8월 20일이었다. 암이삭 비율은 출사기가 빠른 품종에서는 46% 이상 늦은 품종은 40% 이하이었다(P>0.1). 건물 및 TDN 수량은 P3352 품종이 각24.710, 17,470kg/ha로 가장 많았으며 그 다음이 DK729, G4743순이었다(P<0.05). 따라서 대관령지역에서는 조.중생종 품종인 P3352가 가장 수량도 많고 생육특성 면에서도 유리하여 적합한 품종으로 생각된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.421-422
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• 2011

The first part is about development of a liquid target for a neutron source, which is designed to overcome many of the limitations of traditional beam-target neutron generators by utilizing a liquid target neutron source. One of the most critical aspects of the beam-target neutron generator is the target integrity under the beam exposure. A liquid target can be a good solution to overcome damage to the target such as target erosion and depletion of hydrogen isotopes in the active layer, especially for the one operating at high neutron fluxes with no need for water cooling. There is no inherent target lifetime for the liquid target neutron generator when used with continuous refreshment of the target surface exposed to the energetic beam. In this work, liquid target containing hydrogen has been developed and tested in vacuum environment. Potentially, liquid targets could allow a point neutron source whose spatial extension is on the order of 1 to $10{\mu}m$. And the second is about the vacuum ultraviolet (VUV) spectrometer which is designed as a five-channel spectral system for ITER main plasma measurement. To develop and verify the design, a two-channel prototype system was fabricated with No. 3 (14.4 nm~31.8 nm) and No. 4 (29.0 nm~60.0 nm) among the five channels. For test of the prototype system, a hollow cathode lamp is used as a light source. The system is composed of a collimating mirror to collect the light from source to slit, and two holographic diffraction gratings with toroidal geometry to diffract and also to collimate the light from the common slit to detectors. The two gratings are positioned at different optical distances and heights as designed. To study the appropriate detector for ITER VUV system, two different electronic detectors of the back-illuminated charge coupled device and the micro-channel plate electron multiplier were installed and the performance has been investigated and compared in the same experimental conditions. The overall system performance was verified by measuring the spectrums.

• Asian-Australasian Journal of Animal Sciences
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• 제28권6호
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• pp.807-815
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• 2015

The present study aimed at evaluating the intensity of Tifton 85 conditioning using a mower conditioner with free-swinging flail fingers and storage times on dehydration curve, fungi presence, nutritional value and in vitro digestibility of Tifton 85 bermudagrass hay dry matter (DM). The dehydration curve was determined in the whole plant for ten times until the baling. The zero time corresponded to the plant before cutting, which occurred at 11:00 and the other collections were carried out at 8:00, 10:00, 14:00, and 16:00. The experimental design was randomised blocks with two intensities of conditioning (high and low) and ten sampling times, with five replications. The high and low intensities related to adjusting the deflector plate of the free iron fingers (8 and 18 cm). In order to determine gas exchanges during Tifton 85 bermudagrass dehydration, there were evaluations of mature leaves, which were placed in the upper middle third of each branch before the cutting, at every hour for 4 hours. A portable gas analyser was used by an infrared IRGA (6400xt). The analysed variables were photosynthesis (A), stomatal conductance (gs), internal $CO_2$ concentration (Ci), transpiration (T), water use efficiency (WUE), and intrinsic water use efficiency (WUEi). In the second part of this study, the nutritional value of Tifton 85 hay was evaluated, so randomised blocks were designed in a split plot through time, with two treatments placed in the following plots: high and low intensity of cutting and five different time points as subplots: cutting (additional treatment), baling and after 30, 60, and 90 days of storage. Subsequently, fungi that were in green plants as well as hay were determined and samples were collected from the grass at the cutting period, during baling, and after 30, 60, and 90 days of storage. It was observed that Tifton 85 bermudagrass dehydration occurred within 49 hours, so this was considered the best time for drying hay. Gas exchanges were more intense before cutting, although after cutting they decreased until ceasing within 4 hours. The lowest values of acid detergent insoluble nitrogen were obtained with low conditioning intensity after 30 days of storage, 64.8 g/kg DM. The in vitro dry matter of Tifton 85 bermudagrass did not differ among the storage times or the conditioning intensities. There was no fungi present in the samples collected during the storage period up to 90 days after dehydration, with less than 30 colony forming units found on plate counting. The use of mower conditioners in different intensities of injury did not speed up the dehydration time of Tifton 85.

• 정보보호학회논문지
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• 제15권6호
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• pp.37-47
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• 2005

최근 널리 유포되고 있는 악의적인 프로그램으로 e-메일 웜-바이러스가 있다. 이들은 웜-바이러스가 포함된 e-메일이나 첨부파일을 열기 만해도 메일 주소록에 등록된 모든 사용자에게 자신을 전파하며 막대한 피해를 유발시킨다. 본 논문에서는 MS 윈도우즈 시스템에서 e-메일 바이러스의 전파를 차단시켜 주는 두 가지 방법을 제안한다. 첫 번째 방법은 메일 클라이언트에서 [보내기] 버튼의 클릭과 같은 송신자 행위에 의해서만 메일을 발송하게 하였다. 두 번째 방법에서는 제안한 시스템이 정한 규칙에 따라 수신자 베일주소를 변형하는 모듈과 복원하는 모듈이 각각 송신 측에 추가되었다. 또한 새로운 e-메일 웜-바이러스 공격에 대응하기 위한 방법으로 다형성 기법도 적용한다. 두 방법 모두 e-메일 바이러스에 의해 자동으로 메일이 전승되는 것을 차단하도록 설계되었으며, e-메일 수신 측에서는 추가로 실행하는 작업은 없다. 실험을 통해, 제안한 방법들이 적은 오버헤드로 e-메일 웜-바이러스를 효과적으로 차단함을 보였다.

• 산경연구논집
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• 제9권11호
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• pp.67-76
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• 2018

Purpose - Electrical energy saving is one of the practical virtues relating to sustainable living. Therefore, policy-makers has tried to find a way to change the behaviors of individuals to encourage them to actively practice electrical energy saving, even if they have never had this concern or have only passively practiced electrical energy saving to this point. Prior research related to electrical energy saving can be categorized into several types. The first is focused on consumer characteristics linked to electrical energy saving. These studies are based on individual or household socio-demographic variables (e.g., age, gender, household income, education level, occupants, marital status, number of households), and psycho-graphics (e.g., environmental consciousness, value, attitude, motivation, lifestyle). The second is focused on policies (e.g., monetary incentives, information sharing, social comparison, feedback), and technologies (e.g., energy-efficiency home appliances, energy-reduced products, renewable resources). People generally have a favorable attitude towards electrical energy saving, while electrical energy saving practices tend to be less favorable. Therefore, it is necessary for policy-makers to seek out gaps between attitudes and behaviors and find alternatives to reduce these gaps. This study investigates the influence of authenticity on the behavioral intention of electrical energy saving. It is supposed that electrical energy saving practices are likely to be stronger as authenticity of individual or household becomes stronger. This study reviews prior literature and examines various studies to provide an understanding of the relationships between authenticity and electrical energy saving behavioral intention. Research design, data, and methodology - Hypothesis was drawn from analysis based on previous research. The items related to authenticity and electrical energy saving were selected from items found in previous research. To verify this hypothesis, data were collected via experimental survey method and the resulting data were analyzed using reliability analysis, correlation analysis, and hierarchical regression analysis. Results - This study found that authenticity had a positive impact on the behavioral intention of electrical energy saving. The higher the perceived degree of authenticity, the higher the behavioral intention of electrical energy saving. Conclusions - This study assesses the impact of authenticity on the behavioral intention of electrical energy saving. In order to enhance the practice of electrical energy saving, it is efficient strategy for policy-maker to improve the perceived authenticity of individuals.

• 한국응용과학기술학회지
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• 제36권4호
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• pp.1460-1471
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• 2019

본 연구는 문제중심학습(PBL) 수업을 2018년 2학기 '간호과정과 비판적사고' 교과목에 적용한 후, 비판적 사고성향, 문제해결능력과 전문직 자아개념에 대한 효과를 규명하기 위하여 단일군 전·후 설계를 활용한 원시실험 연구이다. G도에 소재한 간호대학생 59명을 대상으로 자가보고식 설문을 실시하였다. 문제중심학습(PBL) 수업은 전통식 강의 8주, 문제중심학습(PBL) 수업 4주로 진행하였다. 자료분석은 SPSS/WIN 23.0 프로그램을 이용하였으며 일반적 특성은 빈도와 백분율, 두군 간에 차이는 평균, 표준편차, Paired t-test를 시행하였다. 연구결과, 간호대학생의 비판적 사고성향은 문제중심학습(PBL) 수업 전(3.41±.40)보다 수업 후(3.71±.36)에 유의하게 증가하였다(t=4.39, p<.001). 문제해결능력은 문제중심학습(PBL) 수업 전(3.36±.38)보다 수업 후(3.70±.59)에 유의하게 증가하였다(t=3.97, p<.001). 전문직 자아개념은 문제중심학습(PBL) 수업 전(2.92±.28)보다 수업 후(3.22±.50)에 유의하게 증가하였다(t=4.84, p<.001). 따라서 문제중심학습(PBL)을 간호교육에 더욱 확대하여 적용한다면 간호대학생이 갖추어야 할 핵심역량을 높이는데 효과적일 것이라고 사료된다.

• 한국수소및신에너지학회논문집
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• 제22권3호
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• pp.326-332
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• 2011

The authors examined the effects of operating parameters on the $H_2$ production by dark fermentation of the wastewater generated from food waste recycling facilities, in short "food waste wastewater (FWW)". Central composite design based response surface methodology was applied to analyze the effect of initial pH (5.5-8.5) and substrate concentration (2-20 g Carbo. COD/L) on $H_2$ production. The experiment was conducted under mesophilic ($35^{\circ}C$) condition and a heat-treated ($90^{\circ}C$ for 20min)anaerobic digester sludge was used as a seeding source. Although there was a little difference in carbohydrate removal, $H_2$ yield was largely affected by the experimental conditions, from 0.38 to 1.77 mol $H_2$/mol $hexose_{added}$. By applying regression analysis, $H_2$ yield was well fitted based on the coded value to a second order polynomial equation (p = 0.0243): Y = $1.78-0.17X_1+0.30X_2+0.37X_1X_2-0.29X_1{^2}-0.35X_2{^2}$, where $X_1$, $X_2$, and Y are pH, substrate concentration (g Carbo. COD/L), and hydrogen yield (mol $H_2$/mol $hexose_{added}$), respectively. The 2-D response surface clearly showed a high inter-dependency between initial pH and substrate concentration, and the role of these two factors was to control the pH during fermentation. According to the statistical optimization, the optimum condition of initial pH and substrate concentration were 7.0 and 13.4 g Carbo. COD/L, respectively, under which predicted $H_2$ yield was 1.84 mol $H_2$/mol $hexose_{added}$. Microbial analysis using 16S rRNA PCR-DGGE showed that $Clostridium$ sp. such as $Clostridium$ $perfringens$, $Clostridium$ $sticklandii$, and $Clostridium$ $bifermentans$ were main $H_2$-producers.

• 산경연구논집
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• 제10권9호
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• pp.25-36
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• 2019

Purpose - Consumers have memories of their past time that they have not experienced. So consumers want to experience the past time and get pleasure through historical contents such as movies or dramas. This is because the re-created the past time sets the identity of the consumers who live today, and in the process, it give consumers emotional comfort. Consumers do not remember and sympathize with all of their historical time. In general, consumers remember the time that their communities are proud of. As s result, historical content is seen as a hero, and through that, consumers can check their identity. Also consumers experience positive emotions such as self-esteem, gratitude and pride through identification with heroes. That is, through historical contents, consumers can identify themselves and replace the current negative emotions with positive ones. Therefore, this study presents narrative identity and historical nostalgia that can affect positive evaluation of historical contents and suggest the factors the can induce such effects. This study was conducted to explain what the consumption effect of historical content is from a marketing perspective and what constitutes a component of historical content as a factor driving this effect. Research design, data, and methodology - This study has developed a questionnaire with 8 Hypotheses. The Films ('Masquerade(2012)', 'Roaring Current(2014)', 'Assassination(2015)', 'The Age of Shadow(2016)') and dramas('Six Flying Dragon(2015-2016)', 'Mr. Sunshine(2018-2019)') were used as experimental contents. 268 college students participated in this empirical study, and structural equation model was used to verify hypotheses. Results - Frist, narrative identity affects positive evaluation of historical contents. Nostalgia affect positive evaluation of historical contents. and narrative identity affects positive response of historical nostalgia. Second, character act relevance, circumstance similarity, and character attractiveness have positive influence upon response of narrative identity. Lastly, empathy for story and vividness of representation have also positive influence upon response of historical nostalgia. Conclusion - This study contributes to the theoretical and managemental development of historical contents. This study shows that narrative identity and historical nostalgia are important for success of historical contents. In order for historical content to be successful, it must manage elements of character act relevance, circumstance similarity, and character attractiveness, empathy for story and vividness of representation.

• 한국물환경학회지
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• 제28권5호
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• pp.704-716
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• 2012

본 논문은 California의 South Lake Tahoe, 서울 뚝섬정수장 그리고 성남 복정정수장에서 2010년 2월에서 2012년 2월까지 수행된 파일럿 실험에 대한 분석결과를 기초로 작성되었다. 본 실험의 목적은 첫째, 한강을 원수로 하는 모래여과 처리수에 대한 오존 및 과산화수소(Peroxone)의 반응특성을 파악하고, 둘째는 AOP(고도산화공정)을 통해 맛 냄새 유발물질인 2-methylisoborneol(MIB)를 제거하기위한 경험적인 오존 및 과산화수소의 투입량을 결정하고자 하였다. 또한 셋째로, 처리공정이후 인체에 안전한 잔류오존농도로 감소시키기 위한 최적 투입량을 결정하고자 하였다. 본 실험은 계절의 기온변화에 따라 저수온 및 고수온의 조건하에서 실시간으로 수행되었다. 본 실험을 통해 오존의 분해속도는 온도와 pH에 영향을 받는 것으로 나타났으며, 이는 다른 연구결과와 일치한다. 원수로 모래여과수에 MIB를 40~50ng/L의 농도로 투입하였으며, 모든 경우에서 7ng/L 이하로 처리되었으며 대부분의 경우에서 검출(ND)되지 않았다. Peroxone은 MIB을 제거할 뿐아니라 오존을 단독으로 사용한 경우보다 오존+과산화수소 동시에 투입한 경우에 잔류오존농도가 더 낮았다. 저수온에서 상당량의 오존이 반응 및 분해를 통해 감소된다. 본 실험을 통해 "Pre-Conditioned" 과산화수소를 적용함으로써 초기 반응율을 향상시키고 잔류오존농도를 낮출 수 있었으며, 약품의 과투입 및 효율저하를 방지하는 과산화수소의 투입 위치 및 구성 그리고 투입방법을 제시하였다.

• 한국미생물·생명공학회지
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• 제31권1호
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• pp.83-89
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• 2003

2,4-D는 자연에서 잘 분해되지 않아 환경에 대하여 심각하게 문제를 일으키지만 널리 사용되고 있는 제초제이다. 이 연구는 광주광역시 인근 지역 과수원에서 분리한 균주 중 가장 높은 2.4-D분해 활성을 보이는 균주를 선정하여, 동정한 결과 Aeromonas sp.로 판명된 균주를 가지고 표면 반응법(Response Surface Methodology)을 이용하여 2,4-D 분해를 최대화하기 위한 중요한 변수들인, pH,온도, 영양분의 농도들의 최적조건을 고찰하였다. 2,4-D분해에 많은 영향을 미치는 변수는 영양분의 농도로 밝혀졌으며, 통계 분석결과 2,4-D분해 최적 조건은 pH 6.5, 온도 $31.8-32.1^{\circ}C$, 영양분 29.6-30.1 g/1로 밝혀졌다.