• 한국융합학회논문지
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• 제12권8호
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• pp.13-21
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• 2021

본 연구는 지리정보시스템과 빅데이터 분석 시스템을 활용하여 관광객 유입동향 및 소비패턴 분석에 목적을 둔 연구이다. 인천광역시 주요 관광지 중 송도센트럴파크와 차이나타운을 선정하여 2017년 6월 1개월 동안 유동인구 분석, 카드매출 분석을 진행하였다. 전국 광역시도로부터 송도센트럴파크에 방문한 관광객은 인천광역시, 경기도, 서울특별시 순으로 높게 나타났으며, 외국인 관광객 비중은 중국이 가장 높았다. 차이나타운 관광객의 카드 소비 이용건수는 남성이 여성보다 12.4% 높게 나타났고 카드소비 금액도 남성이 18% 높게 나타났다. 본 연구는 관광객들의 유입동향 및 소비패턴을 분석하여 관광정책 수립의 주요 쟁점들을 도출함으로써 관광정책의 전략적 방안을 제안하는데 시사점이 있다. 본 연구를 바탕으로 향후 관광 인프라 구축 개선에 도움이 될 수 있다고 기대된다.

• 한국수자원학회논문집
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• 제54권spc1호
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• pp.1023-1035
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• 2021

본 연구는 머신러닝 기반의 분석으로 해수담수화(Desalination) 시설의 전력비 예측모델의 가능성을 검토하였다. 해수담수화 주요 공정인 역삼투(Seawater Reverse Osmosis) 시설의 전력비 예측 모델을 개발하고, 전력비 산정에 영향을 미치는 인자를 분석하였으며, 해수 수질 중에서 선정된 수온 및 염분도 측정자료를 활용하여 검토하였다. 국립해양조사원(Korea Hydrographic and Oceanographic Agency, KHOA)의 2003년부터 2014년까지의 자료를 이용하였으며, 모형의 구조는 시행오차법(Trial & Error)으로 하이퍼파라미터를 최적화하여 머신러닝 기반의 예측 모델을 구축하고, 장래 해수 수질을 예측하였다. 해수 수온은 기존 패턴과 유사할 것으로 예측되었고, 염분도는 과거 측정자료 범위 이내로 최대값이 점차 감소되는 경향을 보여 해수담수화의 전력비가 약 0.80% 감소하는 것으로 검토되었다. 본 연구는 머신러닝 기반의 예측 모델을 구축하여 장래 수질 변화 예측하였으며, 해수 수질 변동의 영향 및 대안을 제시했다는데 의의가 있다.

• Advances in concrete construction
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• 제12권5호
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• pp.429-437
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• 2021

In the era of building engineering the intensification of Self Compacting Concrete (SCC) is world-shattering magnetism. It has lot of rewards over ordinary concrete i.e., enrichment in production, cutback in manpower, brilliant retort to load and vibration along with improved durability. In the present study, the mechanical strength of CM-2 (SCC containing 10% of rice husk ash (RHA) as cement replacement and 600 grams of glass fibers per cubic meter) was investigated at various dosages of cement replacement by fly ash (FA) and GGBS. A total of 17 SCC mixtures including two control SCC mixtures (CM-1 and CM-2) were developed for investigating fresh and hardened properties in which, ten ternary cementitious blends of SCC by blending OPC+RHA+FA, OPC+RHA+GGBS and five quaternary cementitious blends (OPC+RHA+FA+GGBS) at different replacement dosages of FA and GGBS were developed with reference to CM-2. For constant water-cement ratio (0.42) and dosage of SP (2.5%), the addition of glass fibers (600 grams/m³) in CM-1 i.e., CM-2 shows lower workability but higher mechanical strength. While fly ash based ternary blends (OPC+RHA+FA) show better workability but lower mechanical strength as FA content increases in comparison to GGBS based ternary blends (OPC+RHA+GGBS) on increasing GGBS content. The pattern for mixtures appeared to exhibit higher workablity as that of the concentration of FA+GGBS rises in quaternary blends (OPC+RHA+FA+GGBS). A decrease in compressive strength at 7-days was noticed with an increase in the percentage of FA and GGBS as cement replacement in ternary and quaternary blended mixtures with respect to CM-2. The highest 28-days compressive strength (41.92 MPa) was observed for mix QM-3 and the lowest (33.18 MPa) for mix QM-5.

• Advances in concrete construction
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• 제14권1호
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• pp.45-55
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• 2022

In this article, the flexural and shear capacity of ultra-high-performance fiber-reinforced concrete beams (UHPFRC) using two kinds of rebars, including GFRP and steel rebars, are experimentally investigated. For this purpose, six UHPFRC beams (250 × 300 × 1650 mm) with three reinforcement ratios (ρ) of 0.64, 1.05, and 1.45 were constructed using 2% steel fibers by volume. Half of the specimens were made of UHPFRC reinforced with GFRP rebars, while the other half were reinforced with conventional steel rebars. All specimens were tested to failure in four-point bending. Both the load-deformation at mid-span and the failure pattern were studied. The results showed that utilizing GFRP bars increases the flexural strength of UHPFRC beams in comparison to those made of steel bars, but at the same time, it reduces the post-cracking strain hardening. Furthermore, by increasing the percentage of longitudinal bars, both the post-cracking strain hardening and load-bearing capacity increase. Comparing the experiment results with some of the available equations and provisions cited in the valid design codes reveals that some of the equations to predict the flexural strength of UHPFRC beams reinforced with conventional steel and GFRP bars are reasonably conservative, while Khalil and Tayfur model is un-conservative. This issue makes it essential to modify the presented equations in this research for predicting the flexural strength of UHPFRC beams using GFRP bars.

• 대한한의학원전학회지
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• 제35권3호
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• pp.41-58
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• 2022

Objectives : In this paper, the outline and overall content of the Majinhwiseong, a specialized medical text on measles written by Lee Wonpung was introduced, along with its academic historical meaning. Methods : The entire Majinhwiseong was analyzed according to content and form. In terms of form, organization, construction, cited literature, etc., were studied, while in terms of content, diagnosis of disease pattern and treatment formulas were studied. Later, based on cited medical texts and the author's social position, the academic historical meaning of this book was discussed. Results : Through the Majinhwiseong, Lee Wonpung strengthened the credibility of the text by not only providing medical knowledge on measles but listing their sources and comparing and analyzing related contents. In the diagnosis part, Lee focused on the changes in symptom, shape, color, and pulse of measles, discussing in detail its differential diagnostic methods. In the treatment part, while listing numerous formulas suggested by Ming (明) masters, Lee did not leave out treatment experiences of Joseon physicians. Meanwhile, the Majinhwiseong is indicative of measles medicine in 18th century Joseon having been progressed in the private sector rather than the official, and how the results of private sector medicine were being absorbed into the official realm through the Uiyakdongcham (議藥同參) system. Conclusions : The Majinhwiseong is a practical treatment manual written by clinician Lee Wonpung to deal measles which was widely spread at the time. The author organized existing medical knowledge on measles for clinicians while reflecting outcomes and medical situation of Joseon physicians in this book. Based on these findings, we could verify that medicine in 18th century Joseon had been progressing actively around the private medical sector.

• 한국지반공학회논문집
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• 제23권5호
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• pp.89-100
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• 2007

본 연구에서는 건조 고결층이 형성된 준설 매립 지반의 지반 개량 및 보강을 위한 시공 초기 단계에서 지반의 안정성과 장비의 주행성 평가 시 고려되는 지지력 산정과 관련하여 다양한 실내 및 현장 시험을 수행하였다. 지반조사를 통해 기본물성 특성을 파악하였고 현장 베인 시험 및 일축압축 직접전단시험을 통하여 지반의 깊이별 강도분포와 고결층의 강도 특성 및 응력-변형률 거동을 살펴보았다. 또한 지반의 지지력 평가와 하중-침하 곡선 및 파괴형태를 파악하기 위하여 평판재하시험을 수행하였다. 기존의 2층 지반 지지력 산정 기법을 이용하여 지지력을 산정하였으며 이를 평판재하시험 결과와 비교하여 지지력 산정 기법의 적용 방법에 대하여 논의해 보았다.

• Advances in concrete construction
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• 제15권4호
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• pp.251-267
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• 2023

In this paper, an experimental investigation is carried out to assess the inherent self-compacting properties of geopolymer mortar and its impact on flexural strength of thin-walled ferro-geopolymer box beam. The inherent self-compacting properties of the optimal mix of normal geopolymer mortar was studied and compared with self-compacting cement mortar. To assess the flexural strength of box beams, a total of 3 box beams of size 1500 mm × 200 mm × 150 mm consisting of one ferro-cement box beam having a wall thickness of 40 mm utilizing self-compacting cement mortar and two ferro-geopolymer box beams with geopolymer mortar by varying the wall thickness between 40 mm and 50 mm were moulded. The ferro-cement box beam was cured in water and ferro-geopolymer box beams were cured in heat chamber at 75℃ - 80℃ for 24 hours. After curing, the specimens are subjected to flexural testing by applying load at one-third points. The result shows that the ultimate load carrying capacity of ferro-geopolymer and ferro-cement box beams are almost equal. In addition, the stiffness of the ferro-geoploymer box beam is reduced by 18.50% when compared to ferro-cement box beam. Simultaneously, the ductility index and energy absorption capacity are increased by 88.24% and 30.15%, respectively. It is also observed that the load carrying capacity and stiffness of ferro-geopolymer box beams decreases when the wall thickness is increased. At the same time, the ductility and energy absorption capacity increased by 17.50% and 8.25%, respectively. Moreover, all of the examined beams displayed a shear failure pattern.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.208-210
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• 2021

인터넷에 연결되는 사물의 수가 급격히 증가함에 따라 센서와 통신 기능을 포함해서 단순 모니터링 기능을 하거나, 서버로 전달하는 기능에서 벗어나 점점 인간에게 직접 가치를 제공하는 지능형 디바이스 개발 사업이 확장되고 있다. 따라서 디바이스가 주변 센싱 정보를 분석해서 주변 환경을 사용자들의 기호나 안전을 고려해서 변경하는 기술을 개발할 전망으로. 공기를 이용하여 다양한 효과를 가져올 수 있는 개발 제품에 생체신호 측정 시스템을 구축함으로써, 착좌 시 압력 분포의 변화 패턴을 통해 사용자의 상태를 파악할 수 있게 할 예정이다. 온도측정 센서와 사용자의 접촉을 통해 에어카시트 사용에 쾌적함을 높이고, 본 논문에서는 생체신호 측정 데이터에 의한 에어펌프 제어 시스템을 연계하여 구축하여 측정된 생체신호는 스마트폰 애플리케이션을 통해 보호자가 확인 및 조절을 할 수 있도록 하여 효과적으로 관리가 가능한 구축 시스템을 제안한다.

• 한국지형학회지
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• 제28권1호
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• pp.83-99
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• 2021

Burn severity analysis using satellite imagery has high capabilities for research and management in inaccessible areas. We extracted the forest fire area of the DMZ (Demilitarized Zone) in the western Imjin Estuary which is restricted to access due to the confrontation between South and North Korea. Then we analyzed the forest fire severity and recoverability using atmospheric corrected Surface Reflectance Level-2 data collected from Landsat-8 OLI (Operational Land Imagery) / TIRS (Thermal Infrared Sensor). Normalized Burn Ratio (NBR), differenced NBR (dNBR), and Relative dNBR (RdNBR) were analyzed based on changes in the spectral pattern of satellite images to estimate burn severity area and intensity. Also, we evaluated the recoverability after a forest fire using a land cover map which is constructed from the NBR, dNBR, and RdNBR analyzed results. The results of dNBR and RdNBR analysis for the six years (during May 30, 2014 - May 30, 2020) showed that the intensity of monthly burn severity was affected by seasonal changes after the outbreak and the intensity of annual burn severity gradually decreased after the fire events. The regrowth of vegetation was detected in most of the affected areas for three years (until May 2020) after the forest fire reoccurred in May 2017. The monthly recoverability (from April 2014 to December 2015) of forests and grass fields was increased and decreased per month depending on the vegetation growth rate of each season. In the case of annual recoverability, the growth of forest and grass field was reset caused by the recurrence of a forest fire in 2017, then gradually recovered with grass fields from 2017 to 2020. We confirmed that remote sensing was effectively applied to research of the burn severity and recoverability in the DMZ. This study would also provide implications for the management and construction statistics database of the forest fire in the DMZ.

• 산업진흥연구
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• 제8권4호
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• pp.257-266
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• 2023

이 연구는 중국 서부지역의 대학을 중심으로 진행되었으며, 2017년부터 2021년까지 12개 대학의 연구수준을 정적 효율성과 동적 효율성을 모두 고려하여 조사하였다. 정적 효율성은 데이터 포락 분석(DEA)을 사용하여 검사하였고, 동적 효율은 Malmquist 모델을 사용하여 분석하였다. 분석결과, 서부12개 대학의 과학연구 효율성은 일반적으로 높지 않았으며 '쌍일류' 건설의 맥락에서 대학의 과학연구 효율성은 증가하는 추세를 보이고 있으며, 과학연구 효율성의 원인으로 최근 몇 년 동안 효율성이 크게 증가하였다. 연구 활동의 TFP (Total Factor Productivity)는 기술진보지수의 영향을 받아 초기에 증가하다가 감소하다가 다시 증가하는 패턴을 보였다. 연구 결론은 서부 대학들의 과학연구 활동을 위해 자원을 합리적으로 배분하여 효과적인 과학연구 메커니즘을 갖추어서, 관리기준을 개선하여야 한다. 이에 과학혁신과 이에 상응하는 성과를 촉진하여, 궁극적으로 중국 서부의 과학기술 수준을 높일 수 있어야 하겠다.