• 현장농수산연구지
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• 제26권1호
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• pp.30-39
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• 2024

Korean arboretums where a large number of people are visiting could not do visitor's satisfaction in qualitative side and communication through education and event, although a lot of those things statistically have been doing so far. At this side, it needs an arboretum's segmentation: preparing to an adaptation strategy of a new paradigm, differentiated strategy, and problem solving strategy tied by a similar group for the Korean arboretum visitors. This research tries to classify several patterns with Korean arboretums by visitor's behavior and propose each type of subspecialized management plan after analyzing characteristic of supply and demand. The research for this tries to classify several patterns of Korean arboretum and suggest segmentalzed management plan by types after analyzing characteristics of aspects of demand and supply. By looking at the main patterning result of arboretum as a standard of the demand, there were four sorts of arboretums. In the first, it is the arboretum of intermediate type: not a clear characteristic. In the second, it is an arboretum of multipurpose resort type: strongly demanding motivational factors of a rest, health, access, low cost, experience, learning and sightseeing. In the third, it is an arboretum of theme tour type: a strong sightseeing motivational factor and demanding appreciate scenery. In the last, it is an arboretum of studying and admiring type: demanding a motivational factor of sightseeing landscape and plants, a strong experience and learning.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권5호
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• pp.220-229
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• 2004

We have examined a technique of one-dimensional (1D) fluid modeling for radio-frequency Ar capacitively coupled plasmas (CCP) between unequal-sized powered and grounded electrodes. In order to simulate a practical CCP reactor configuration with a grounded side wall by the 1D model, it has been assumed that the discharge space has a conic frustum shape; the grounded electrode is larger than the powered one and the discharge space expands with the distance from the powered electrode. In this paper, we focus on how much a 1D model can approximate a 2D model and evaluate their comparisons. The plasma density calculated by the 1D model has been compared with that by a two-dimensional (2D) fluid model, and a qualitative agreement between them has been obtained. In addition, 1D and 2D calculation results for another reactor configuration with equal-sized electrodes have also been presented together for comparison. In the discussion, four CCP models, which are 1D and 2D models with symmetric and asymmetric geometries, are compared with each other and the DC self-bias voltage has been focused on as a characteristic property that reflects the unequal electrode surface areas. Reactor configuration and experimental parameters, which the self-bias depends on, have been investigated to develop the ID modeling for reactor geometry with unequal-sized electrodes.

• 대한지구과학교육학회지
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• 제4권2호
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• pp.151-165
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• 2011

Following a microgenetic design, this study was analysed the characteristic and the change of classification strategy that appear in college students' classification activity. The 4 tasks were developed for classification activity; a shell as a familiar real things, an animal fossil as a unfamiliar real things, a snow flake as a familiar picture cards and galaxy as a unfamiliar picture card. Achieved study to 6 college students who major in elementary education. Data were collected by interview with subjects, subject's classification schema, investigator's observation of subject's activity, and videotaped that record subject's subject classification process over an extended period of 6 times. Result proved in this study is as following. In the 6 times of the data collection procedures, a strategy F identifying concrete attribution of classification objects and a more detailed strategy X3 combining qualitative, spatial and dimensional attribution were found and more frequently used in both groups of college students which reported a classification process and did not report the process. While discovery and absorption of both a concrete classification strategy and a detailed classification strategy were rapidly developed in the reporting group, they were gradually developed in the non-reporting group. In addition to this, as the data collection procedures were progressing, the college students were familiar with change factors of classification tasks and in the case of pictures the classification strategy showed more desirable changes.

• Journal of Forest and Environmental Science
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• 제33권1호
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• pp.8-21
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• 2017

The objective of this study is to identify the individual characteristics and the elements of social capital hence a suitable design of social capital reinforcement can be proposed to promote a sustainable community-based mangrove management. The research conducted in three villages that were selected based on mangrove ecological differences in Lampung Province, Indonesia. Qualitative data was collected through field observation and in-depth interviews with key informants. The results showed that the population in the three villages dominated on productive ages, worked as farmers, and less educated (only a half of the population had fulfilled the basic education standard of Indonesia). The study results also indicated that the social capital in the communities showed minimum condition of interpersonal attachment and cooperation. This condition was derived from the attitude of the people who only took personal benefit without concerning to others' welfare. Many programs conducted by government to ensure the conservation of mangroves were project-oriented with minor participation of community. The minor participation might also contributed to the minimum of social capital in the community. To improve social capital, the communities should strengthen mutual trust based on mutual benefit to increase members' participation in mangrove activity.

• 한국주거학회논문집
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• 제27권6호
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• pp.45-55
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• 2016

This study focused on the changes of residential area around the linear park. The goal of this study is to determine the value of linear park at the view of residents and discover the interaction between the linear park and the residential area around it. To investigate this goal, the researcher chose case sites, the regenerated linear park and the uncovered stream park. This study analyzed the site around the linear parks with four points of view, the organization of urban Fabric, architecture, the economic value of the site and the behavior of residents. This research adopted several research methodologies like aerial photograph analysis, road-view analysis, paper research, and field study, observation, and expert interview to approach as both quantitative and qualitative analysis. With that variation characteristic, the researcher determines the influence of linear park through the residential area around them. As the result, linear park gives positive effects of running sustainable residential area around them and acting as the pivot for the residential area. Also for the future, designers must consider this interactive relation between the linear park and residential area with the wide point of view.

• 환경영향평가
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• 제10권1호
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• pp.1-8
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• 2001

Detection of red tides by satellite remote sensing can be done either by detecting enhanced level of chlorophyll pigment or by detecting changes in the spectral composition of pixels. Using chlorophyll concentration, however, is not effective currently due to the facts: 1) Chlorophyll-a is a universal pigment of phytoplankton, and 2) no accurate algorithm for chlorophyll in case 2 water is available yet. Here, red band algorithm, classification and PCA (Principal Component Analysis) techniques were applied for detecting patches of Cochlodinium polykrikoides red tides which occurred in Korean waters in 1995. This dinoflagellate species appears dark red due to the characteristic pigments absorbing lights in the blue and green wavelength most effectively. In the satellite image, the brightness of red tide pixels in all the three visible bands were low making the detection difficult. Red band algorithm is not good for detecting the red tide because of reflectance of suspended sediments. For supervised classification, selecting training area was difficult, while unsupervised classification was not effective in delineating the patches from surrounding pixels. On the other hand, PCA gave a good qualitative discrimination on the distribution compared with actual observation.

• 센서학회지
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• 제27권2호
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• pp.118-125
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• 2018

An evaluation system for an electronic-nose concept using three types of metal oxide gas sensors that react similarly to the human olfactory cells was constructed for the quantitative and qualitative evaluation of aroma fragrances. Four types of aroma fragrances (lavender, orange, jasmine, and Roman chamomile), which are commonly used in aromatherapy, were evaluated. All the gas sensors reacted remarkably to the aroma fragrances and the good correlation of r=0.58-0.88 with the aromatic odor intensities by olfaction was confirmed. From the results of the analysis of an electronic-nose concept for classifying the characteristics of aroma oil fragrances, aroma oils could be classified using the fragrance characteristics and oil extraction methods with the cumulative variability contribution rate of 95.65% (F1: 69.65%, F2: 26.03%) by principal component analysis. In the pattern recognition based on the artificial neural network, the four aroma fragrances were 100% recognized through the training data of 56 cases (70%) out of 80 cases, and the pattern recognition rate was 57.1%-71.4% through the validation and testing data of 24 cases (30%). The pattern recognition success rate through all confusion matrices was 82.1%, indicating that the classification of aroma oil fragrances using the three types of gas sensors was successful.

• 한국안전학회지
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• 제31권5호
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• pp.54-60
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• 2016

In this study, tank truck incidents of road transport of hazardous materials to experimental investigated the potential fire hazard. Real scale fire was to perform experiments for on this qualitative and quantitative data collection and analysis. Particularly affected by radiant heat from the flames caused and damage estimates range investigated accordingly. Flame temperature, internal temperature of tank and emitted radiation from the flames was investigated. The flame of light oil spill caused a fire at a temperature of about $300^{\circ}C$ high in comparison with the methanol by combustion of diesel and methanol, according to the difference, the flame duration changes varies depending on the Burning rate. Depending on spill rate(30, 60, 90 and $120{\ell}/min$) and the longer the duration of the flame important factors for the internal temperature of tank lorry rise was found. Road accident in a fire caused by leakage of hazardous was could the higher the damaged. Therefor, Fire suppression activities should be required in particular to be around.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.74-77
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• 2011

고성능 다단연소방식 액체 로켓엔진에 사용되는 기체 중심 스월 동축형 분사기의 리세스 길이 변화에 따른 혼합특성을 수치해석을 통해 연구를 수행하였다. 실제 추진제의 상(phase)은 기체(산화제)-액체(연료)형이지만, 모사조건을 통해 기체-기체로 고려하였다. 추진제의 확산각도를 측정하기 위해 분사기 출구에서의 속도 분포 및 추진제의 분무형상을 분석하였다. 리세스 길이가 증가함에 따라 축방향 속도는 증가하는 반면, 탄젠셜 방향 속도는 감소하였다. 이 결과 확산각도가 감소하는 정성적인 특징을 확인하였다.

• 한국응용과학기술학회지
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• 제32권3호
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• pp.497-504
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• 2015

심해유전개발 중 원유의 흐름보증과 관련하여 하이드레이츠, 아스팔텐, 무기물 침전 등이 주된 관심분야가 될 수 있으며, 특히 왁스에 대해서도 그 특성을 이해하는 것이 중요하다. 원유흐름 중단으로 인한 왁스가 젤을 형성하였을 경우에는, 원유의 흐름을 재시작하기 위해서는 높은 압력의 펌프를 가동해야 하는 어려움이 있다. 본 연구에서는 베인 레오미터를 사용하여 왁스 젤의 항복응력 측정을 통한 왁스 젤의 강도를 측정하고 예측하였다. 또한, 왁스 젤의 강도측정을 통해서 정성적, 정량적인 예측을 시도하였다.