• 한국측량학회지
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• 제35권3호
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• pp.195-202
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• 2017

기존의 넓은 면적 지역에 대한 정사영상은 항공사진측량을 이용하였으나 이 방법은 작은 면적 지역에 대한 정사영상 및 짧은 주기의 지속적인 변화 관측 측면에서는 비경제적이다. 드론은 군사목적으로 개발되어 활용되었으나 최근 농작물 관리 및 분석, 방송 중계, 기상 관측 그리고 재난 조사등 다양한 분야에서 활용되고 있다. 이러한 드론은 가격이 비싼 상업용 드론을 이용한 사례가 많았다. 본 연구에서는 Orthomosaic과 DSM을 제작하기 위하여 소규모 지역에서 활용이 유용한 저가형 조립식 드론, 일반 디지털카메라와 오픈 소스 프로그램인 Mission planner를 이용하여 영상을 취득하고 후처리 작업은 Pix4d 소프트웨어를 사용하였으며 제작된 정사영상의 GCP는 각각 평균 오차 X 좌표는 3.4cm, Y 좌표는 2.4cm, Z 좌표는 4.2cm로 나타났다. 조립식 소형 드론은 소규모 지역에서의 조립식 드론은 빠르게 영상을 취득하고 다양하게 활용 할 수 있을 것으로 보인다.

• 한국약용작물학회지
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• 제18권2호
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• pp.113-117
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• 2010

The antioxidant and anticancer activities of Phellinus linteus, Inonotus obliquus, and Pleurotus ostreatus according to extraction methods were measured. The contents of polyphenolic compounds were higher in fermented extracts than those in water extracts. The contents were 192.4mg/100 $m{\ell}$ for Inonotus obliquus vinegar, 186.9 mg/100 $m{\ell}$ for Phellinus linteus vinegar, and 156.5 mg/100 $m{\ell}$ for Pleurotus ostreatus vinegar, respectively. EDA(electron donating ability) in Phellinus linteus that was highest among mushrooms was 83.9% in the water extract and 96.8% in the fermented extract. The growth of stomach cancer cells, SNU-719 was inhibited 62.4%, 65.5%, and 53.0% by Phellinus linteus vinegar, Inonotus obliquus vinegar, and Pleurotus ostreatus vinegar, respectively and also the growth of liver cancer cells, Hep3B was inhibited 67.1%, 68.3%, and 57.6% by Phellinus linteus vinegar, Inonotus obliquus vinegar, and Pleurotus ostreatus vinegar, while the growth of normal cell, DC2.4 was not affected. Even though Phellinus linteus and Inonotus obliquus showed higher inhibition in cancer cell growth, Pleurotus ostreatus can be efficiently used for antioxidant and anticancer activities due to their cheap price in the market.

• 유통과학연구
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• 제20권8호
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• pp.81-91
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• 2022

Purpose: The work aimed to integrate and distribute the knowledge of marketing and chemistry for product development, in which individual packaging from water hyacinth was ideal. Research design, data, and methodology: A customer perception was surveyed to guide the preparation process, and eco-packaging preparation followed the perception study. The satisfaction with the packaging using the 4Ps was determined. Results: 159 samples participated in the survey to establish their perceptions. They perceived that eco-packaging was a friendly environment with a score of 4.47. The uses of chemicals and water were less. The design for other functions than a normal function of packaging was preferred. The pulping was done using 3.0 M NaOH. The natural additives of carboxymethyl cellulose (defibering) and corn starch (adhesive) were desired. The paper was characterized according to The National Standard of Kraft paper and was equivalent to the liner board. The prototype of packaging was fabricated as individual packaging. The marketing mix was used to survey 200 samples. The satisfaction with the product was the maximum at 4.53, while the minimum was on price. The online channel was preferred to access the product. Conclusions: Water hyacinth could be added value as eco-packaging that the qualities of pulp were equal to the Kraft paper. Individual packaging from water hyacinth was satisfied.

• Advances in materials Research
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• 제11권2호
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• pp.147-164
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• 2022

This study aims to investigate the influence of scoria aggregate (SA) and silica fume (SF) as a replacement of conventional aggregate and ordinary Portland cement (OPC), respectively. Three types of concrete were prepared namely normal weight concrete (NWC) using limestone aggregate (LSA) and OPC (control specimen), lightweight concrete (LWC) using SA and OPC, and LWC using SA and partial SF (SLWC). The representative workability and compressive strength properties of the developed concrete were evaluated, and the results were correlated with non-destructive ultrasonic pulse velocity and Schmidt hammer tests. The LWC and SLWC yielded compressive strength of around 30 MPa and 33 MPa (i.e., 78-86% of control specimens), respectively. The findings indicate that scoria can be beneficially utilized in the development of structural lightweight concrete. Present renewable sources of aggregate will preserve the natural resources for next generation. The newly produced eco-friendly construction material is intended to break price barriers in all markets and draw attraction of incorporating scoria based light weight construction in Saudi Arabia and GCC countries. Findings of the SWOT analysis indicate that high logistics costs for distributing the aggregates across different regions in Saudi Arabia and clients' resistant to change are among the major obstacles to the commercialized production and utilization of lightweight concrete as green construction material. The findings further revealed that huge scoria deposits in Saudi Arabia, and the potential decrease in density self-weight of structural elements are the major drivers and enablers for promoting the adoption of lightweight concrete as alternative green construction material in the construction sector.

• 화약ㆍ발파
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• 제42권1호
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• pp.1-11
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• 2024

터널발파시 기존 연구와 시공사례를 통해 전자발파 공법이 기존 발파공법보다 효과적으로 발파진동 저감효과가 탁월한 것으로 보고되고 있다. 그러나 전자뇌관의 가격이 높아 보안물건이 근접한 발파 현장에서만 일부 활용되는 실정이다. 이에 본 연구는 전자뇌관 적용 비율에 따른 진동저감 효과를 연구하기 위하여 전자뇌관과 비전기뇌관의 비율을 조절하여 터널발파 시험을 수행하였다. 연구결과 전자뇌관 100% 적용한 경우 발파진동의 저감효과가 가장 크고, 전자뇌관 비율을 일정 수준 감소시켜도 발파진동 제어 효과가 있는 것으로 나타났다.

• 대한공간정보학회지
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• 제21권4호
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• pp.83-93
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• 2013

토지의 적성평가에 관한 지침에 따라 토지적성평가시 토지의 적성을 비교적 종합적으로 평가할 수 있으나, 기존지침의 평가지표 및 평가방법에 한계가 있다고 판단하였다. 현재 사용되고 있는 기본지표가 지역의 다양한 특성을 제대로 반영하기에는 한계가 있기 때문에 지역 특성을 반영할 수 있는 평가지표 및 평가방법이 필요한다고 보고 있다. 이러한 토지적성평가의 한계를 타개하기 토지적성평가시 새로운 지표로평가지표를 대체하였을 때 변화되는 적성등급까지 분석하는 실증적 연구이다. 이 연구에서는 관리지역 경계부 임야지역이 합리적인 평가가 이루어지는가를 확인하고, 토지의 적성평가에 관한 지침에 따른 관리지역 경계부 임야지역의 합리적인 평가방법을 확인하였다. 토지적성평가에 지역특성을 반영하기 위한 대체지표를 추가 하거나, 좀 더 효과적인 대체지표가 어떤 것인지를 확인하기 보다는 토지의 적성평가에 관한 지침에 따라 토지적성평가를 수행하였을 때, 관리지역 경계부 임야지역의 합리적인 평가방법을 제시하였다.

• 한국조리학회지
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• 제18권4호
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• pp.47-58
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• 2012

본 연구는 부산지역 K대학교 학생들을 대상으로 식생활 라이프스타일유형에 따른 군집을 도출하고 각 집단과 외식선택속성과 비만도와의 차이를 고찰하고자 연구를 진행하였다. 연구의 목적을 달성하기 위하여 통계프로그램 PASW Statistic 18.0(Predictive Analytics Software)을 이용하여 빈도분석, 요인분석 및 신뢰도분석, t-test, ${\chi}^2$-test, 비 계층적 군집분석과 ANOVA을 실시하였다. 남자 대학생들의 평균키는 175.59 cm, 체중은 69.53kg이고, 여자 대학생들의 평균키는 162.81 cm, 체중은 53.42kg으로 나타내었다. 남학생 체질량지수를 저체중이 1.7%, 정상체중은 64.6%, 과체중 19.7%이고, 비만은 14.0%로 나타났다. 여학생 체질량지수는 저체중이 22.9%. 정상체중은 62.7%, 과체중이 8.5%, 비만은 5.9%를 나타내었다. 식생활라이프스타일 항목은 건강추구, 안전성추구, 분위기추구, 미각추구, 서양음식추구요인으로 추출되었고, 외식선택속성은 음식의 질과 서비스, 합리적인가격, 접근성과 분위기, 먹어본 경험 요인으로 추출되었다. 식생활라이프스타일은 군집1은 [식생활 무관심형 집단] 군집2는 [건강지향형 집단] 군집3은 [건강무관심형 집단]으로 군집 명을 부여하였다. 식생활라이프스타일 군집과 외식선택속성 요인간의 차이분석에서 군집1은 먹어본 경험에서 높은 평균값을 나타내었고, 군집2는 음식과 서비스의 질에서 높은 평균값을 나타내었고, 군집3은 접근선과 이미지에서 높은 평균값을 나타내었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 추계 학술논문 발표대회
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• pp.109-113
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• 2007

This paper introduces a system, Simulation based Stochastic Markup Estimation System (S2ME), for estimating optimum markup for a project. The system was designed and implemented to better represent the real world system involved in construction bidding. The findings obtained from the analysis of existing assumptions used in the previous quantitative markup estimation methods were incorporated to improve the accuracy and predictability of the S2ME. The existing methods has four categories of assumption as follows; (1) The number of competitors and who is the competitors are known, (2) A typical competitor, who is fictitious, is assumed for easy computation, (3) the ratio of bid price against cost estimate (B/C) is assumed to follow normal distribution, (4) The deterministic output obtained from the probabilistic equation of existing models is assumed to be acceptable. However, these assumptions compromise the accuracy of prediction. In practice, the bidding patterns of the bidders are randomized in competitive bidding. To complement the lack of accuracy contributed by these assumptions, bidding project was randomly selected from the pool of bidding database in the simulation experiment. The probability to win the bid in the competitive bidding was computed using the profile of the competitors appeared in the selected bidding project record. The expected profit and probability to win the bid was calculated by selecting a bidding record randomly in an iteration of the simulation experiment under the assumption that the bidding pattern retained in historical bidding DB manifest revival. The existing computation, which is handled by means of deterministic procedure, were converted into stochastic model using simulation modeling and analysis technique as follows; (1) estimating the probability distribution functions of competitors' B/C which were obtained from historical bidding DB, (2) analyzing the sensitivity against the increment of markup using normal distribution and actual probability distribution estimated by distribution fitting, (3) estimating the maximum expected profit and optimum markup range. In the case study, the best fitted probability distribution function was estimated using the historical bidding DB retaining the competitors' bidding behavior so that the reliability was improved by estimating the output obtained from simulation experiment.

• Asian Journal of Business Environment
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• 제2권1호
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• pp.25-34
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• 2012

It is possible to use pallet for forwarding as chinese cabbages and radishes are general large-scale trading items at the agricultural wholesale market though, however, most of these are forwarded as it have packed in net bags or in P·E bags. Thus, it is still hard for palletizing. The type of packing the product in the net bag makes it difficult for palletizing. It is not a stable shape enough and easily collapsed for pallet loading. Because of this collapsibility, the corrugated cardboard box is being used to enhance forwarding efficiency, but the existing corrugated cardboard box could be crushed easily by moist what is from the agricultural product's property and it also could be squashed by the mass of the loaded box layers on itself. In contrary, the functional waterproof corrugated cardboard box is not collapsed through palletizing and it is efficient for product management with it's ventilation function in respond to pre-cooling effect. Furthermore, because it has various functional shapes as the open type, the partition type and so on, it is effective for maintaining freshness of the product and standardizing the distribution of agricultural product. It is well-known that it is possible to introduce this box to cargo-works of agricultural product. Consequently, the recognition of main distributors about the pallet distribution of the chinese cabbage and the radish was apprehended in this study for activating mechanization of loading and unloading. The survey was conducted to the main distributors such as the forwarder, the auction dealer and the commission merchant with Garak-dong wholesale market as the center. The appropriate packing materials and problems of the existing method for loading and unloading were derived through the survey. Especially, it was focused on analyzing the difference of recognition between the subject groups for the way of using waterproof cardboard corrugated box to deal with the difficult product for packing in normal corrugated box because of the box's absorption of moist from the agricultural product like a chinese cabbage and a radish. Total In the cases of the forwarders and the commission merchants, the net was highly responded as 45%, 74% from each groups for the best packing material for mechanization of distribution and the waterproof corrugated cardboard box was responded as 20%, 22% from each groups as much preferable than multi-stage wooden box. However, for the radish, the waterproof corrugated cardboard box was the best material as 56%, and the auction trader group supported it for 80%. So, the using the waterproof corrugated cardboard box for mechanization of distribution was negative for the chinese cabbage, but it was positive for the radish. The average was 2.42, the standard deviation was 1.24. The negative response(about 55%) was prevailing more than positive response(about 23%). It could be analyzed that even there was the positive recognition for using the waterproof corrugated cardboard box for the radish though the preference for low price of net bag in the chinese cabbage forwarding procedure. Still now, it seems that is a burden for using the waterproof corrugated cardboard box with high price. In the analysis on the recognition differences about using the waterproof corrugated cardboard box for the chinese cabbages and the radish between the forwarders and the commission merchants, generally the negative recognition was prevailing, but the forwarders(2.696) were more positive for using the waterproof corrugated cardboard box than the commission merchants(2.145).

• 에너지공학
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• 제17권3호
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• pp.139-144
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• 2008

최근 유가의 고공행진 때문에 한국은 해외 에너지 자원개발뿐만 아니라 에너지 소비를 줄이기 위한 국가적 정책으로 기존 설비의 에너지 효율을 증가시키는 방안을 모색하는 것이 필요한 시점이다. 따라서 본 연구는 이런 국가적 사안에 부합하고자 인천생산기지 고압 LNG 배관망에 대하여 수정유량방정식을 사용한 Newton Method로 접근하였고, 유창조절밸브(FCV)에 의해 지배적인 영향을 받는 것을 확인할 수 있었다. 또한, 고압펌프는 유량조절밸브 50%의 개도율에서 최고효율을 보여 주었고, 고압배관망 내에서 배관저항곡선은 LNG 헤드가 1,500m 이상이 되어야만 토출이 가능한 것을 보였다. 고압펌프의 운전점으로부터 운전비용을 산출하였고, 최고 효율시 운전비용과 비교하여 운전비용을 절감할 수 있는 금액을 산출하였다. 특히 일간 시간대별 운전비용 절감액뿐만 아니라 연간 일별 운전비용 절감액을 산출하였으며, 그 결과 고압배관망은 연간 138백만원을 절감할 수 있다. 이것은 연간 고압펌프 1기당 9,823천원을 절감할 수 있다는 것을 의미한다. 결론적으로 본 연구는 복잡한 고압 LNG 배관망에서 고압펌프의 운전특성과 운전비용 절감효과를 확인할 수 있었다. 또한 이것은 미시적으로 생산기지의 효율적 미래운영에 대한 기여와 더불어 거시적으로 국가 에너지 경쟁력 제고에 기여할 수 있을 것이다.