• 인간식물환경학회지
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• 제23권3호
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• pp.255-265
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• 2020

Background and objective: The purpose of this study was to provide guidelines for irrigation management by analyzing the effects of soil moisture on the growth characteristics of herbaceous plants in green infrastructure. Methods: In a rain shelter greenhouse, the growth performance of nine species of experimental plants was assessed under different soil moisture contents (20%, 15%, 10%, 5%, and 1%) for about 5 months to analyze plant growth characteristics due to soil humidity. Methods to determine plant growth conditions include surveying growth conditions of the crowns, stems, leaves, flowers and fruits on the aerial part and surveying growth conditions of the roots in the underground part. Results: The results showed that Mukdenia rossii and Astilbe rubra grew well at 15% moisture content with irrigation intervals of 10 and 13 days, respectively. Soil moisture content of 10% with irrigation intervals of 13 and 17 days was appropriate for Sedum kamtschaticum and Pachysandra terminalis. Similarly, Aquilegia japonica and Liriope platyphylla grew well at 15% moisture content with irrigation intervals of 10 and 17 days. However, Ligularia stenocephala grew well-developed stems and roots at 1% soil moisture content and an irrigation interval of 25 days, while the optimum conditions for Lythrum anceps were 5% moisture content and an irrigation interval of 8 days. Conclusion: Although a limited number of experimental plants were used in this study, this study could propose an appropriate irrigation cycle for planting on artificial soil substrates. Based on these results, it is possible to plan suitable planting designs considered irrigation cycles.

• 한방재활의학과학회지
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• 제32권2호
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• pp.37-54
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• 2022

Objectives This review investigates the effectiveness of electroacupuncture for impairment of motor and sensory functions after spinal cord injury. Methods The databases used for the search were PubMed, Cochrane Library, EMBASE, China National Knowledge Infrastructure (CNKI), National Digital Science Library (NDSL), Koreanstudies Information Service System (KISS), Research Information Sharing Service (RISS), KMBASE, and Oriental Medicine Advanced Searching Integrated System (OASIS). The literature were searched using a total of 9 domestic and foreign databases. Randomized controlled trials (RCTs) using electroacupuncture as an intervention was selected. The selected studies are analyzed the risk of bias through Cochrane risk-of-bias tool, and meta-analysis was perfomed using RevMan version 5.3 (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark). Results A total of 14 RCT studies were selected through 9 domestic and foreign databases, and analyzed. As a result of meta-analysis, when electroacupuncture was performed together with rehabilitation treatment or western drug treatment, it was effective in the recovery of motor and sensory functions of spinal cord injury patients. Conclusions This review suggests that electroacupuncture can be applied as an effective treatment for the recovery of motor and sensory functions of spinal cord injuries. However, there are several limitations, including the small number and heterogeneity of the included studies, as well as their poor methodological quality. Therefore, further, higher-quality studies should be required.

• 지질공학
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• 제31권4호
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• pp.549-559
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• 2021

북극권은 막대한 양의 화석연료와 광물자원이 매장되어 있어 개발과 건설 사업이 활발히 추진되고 있다. 전 지구적으로 기후변화에 적극적으로 대응하기 위해 노력하고 있으나, 여전히 천연자원의 의존도는 매우 높다. 본 논문에서는 북극권 국가 중 비전통(오일샌드) 에너지·자원개발이 활발히 진행 중인 캐나다(앨버타주)를 대상으로 조사연구를 수행하였다. 광범위한 지역에 대한 조사비용과 시간을 절감하기 위하여 위성영상을 활용하여 토지피복도를 작성하였다. 토지피복도의 픽셀을 계산하는 방식으로 캐나다(앨버타주) 오일샌드 개발 활동이 활발히 진행되고 있는 지역의 계절별 건설환경(지표 온도 변화, 적설분포 면적 등) 자료를 구축하였다. 본 논문에서 수행한 조사·분석 방법론은 북극권 자원 개발 사업의 성공적 추진과 운영을 위한 전략수립, 기본 설계 등에 활용될 것으로 기대한다.

• Journal of Information Science Theory and Practice
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• 제10권1호
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• pp.1-17
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• 2022

The article reports the results of an investigation on the practice of providing digital scholarship services at Vietnam National University Ho Chi Minh City, Vietnam. This study is part of an ongoing research project entitled Developing a digital scholarship service framework for universities at Vietnam National University Ho Chi Minh City. It employed a qualitative research approach through in-depth interviews with 31 individuals who are university managers, library managers, lecturers, and postgraduate and undergraduate students from six member universities and Central Library of Vietnam National University Ho Chi Minh City. Research results show that some digital scholarship services have been provided at Vietnam National University Ho Chi Minh City. However, they have not been yet systematically implemented and have not met users' needs. Lack of needed resources such as space, technology infrastructure, human resources, finance, and stakeholder support are among major challenges in developing digital scholarship services. The management of existing digital scholarship services is fragmented without a clear policy for developing digital scholarship and supporting services. The study contributes to the existing knowledge by adding substantially to current understanding of the practice of providing digital scholarship services in Vietnam's universities in the transition period, from state control to autonomy, which has not been much addressed in previous research. Furthermore, this study can be a useful reference for higher education institutions in developing countries regarding implementation of digital scholarship services.

• 한국지반공학회논문집
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• 제38권10호
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• pp.41-48
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• 2022

전단파 속도를 기반으로 포화 지반의 최대 전단탄성계수를 산정하는데 이용되는 매질의 밀도가 명확하지 않아 이를 결정하고자 검증식을 구성하고, 시나리오를 수립하여 실내 실험결과와 비교하였다. 매질의 밀도는 포화, 습윤, 건조, 수중 밀도 조건으로 가정하였고, 각 경우별 건조지반 전단파속도 대비 포화지반 전단파속도의 비를 산정하였다. 포화 밀도 가정시 전단파속도 비는 공진주 실험 결과에 의한 전단파속도 비와 일치하였고, 습윤 밀도 가정시에는 벤더엘리먼트 실험 결과에 의한 값과 일치하였다. 이는 특성 주파수를 경계로 흙입자와 유체의 거동을 정의하는 Biot(1956)의 이론과 일치하는 결과이며, 일반적으로 고려되는 지진의 주파수 범위를 고려한다면 포화 지반에서는 포화 밀도를 적용하는 것이 타당할 것으로 사료된다.

• 한국경제지리학회지
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• 제25권3호
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• pp.420-450
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• 2022

최근 테슬라나 삼성전자 등 글로벌 기업들이 미국 텍사스 주로 본사를 이전하거나, 기존 생산시설의 확장 또는 신규 지역거점본부를 설립하는 현상이 두드러지게 나타나고 있다. 이른바 '텍시트(Texit)'로까지 명명되는 텍사스를 향한 기업들의 투자 행렬은 2000년대부터 가속화되어 오고 있는 현상이며, 지리적으로 댈러스-포트워스, 휴스턴, 오스틴, 샌안토니오를 중심으로 하는 대도시권 산업클러스터에 집중되어 있다. 이를 배경으로 본 논문은 텍사스 대도시권 산업클러스터의 부문별 현황과 지리적 특징을 고찰하고, 강력한 제도적 행위자로서 텍사스 주정부가 어떠한 산업클러스터 발전 정책을 추진해 왔는지를 살펴본다. 연구 결과, 텍사스의 시장자유주의 정책, 다각화된 인센티브 프로그램, 대도시권별 특성화 등이 주정부 발전 전략의 핵심을 이루고 있는 것으로 파악되었다. 텍사스는 실리콘밸리와 같이 보헤미안적 자유주의에 바탕을 둔 국지화된 기업가주의와 그에 따른 창업이 활발하지는 않지만, 강력한 주정부의 리더십 하에서 낮은 세율과 규제완화, 저렴한 토지와 인프라, 우수한 교육제도와 인적자본 등에서 경쟁우위를 형성하여 이를 외부 투자유치에 적극적으로 활용하고 있다.

• 아태비즈니스연구
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• 제13권3호
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• pp.449-461
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• 2022

Purpose - The purpose of this study to explore factors consumers prioritize when purchasing seafood online. The originality of the study lies on adopting AHP-based approach in analyzing prioritized purchasing factors of seafood online. Design/methodology/approach - A survey was conducted targeting Korean consumers who have purchased seafood online. AHP method was applied to rank factors consumers prioritize before making decision. Findings - First, product's factor ranked first among other high level factors including delivery service, seller, online platform. Second, sanitation, taste, country of origin ranked first, second, third respectively, within product's factors. Third, safe delivery, timeliness, information accuracy ranked first, second, third respectively, within delivery factors. Fourth, consumer reviews, consumer response ability, promotion ranked first, second, third within seller factors. Fifth, Personal information management system, credibility, user-friendliness ranked first, second, third, within online platform factors. Research implications or Originality - To activate seafood online market, it is crucial to assure consumers that the seafood is well managed in a sanitary way from the production site to table. Existing government programs such as seafood traceability system, HACCP, and cold-chain infrastructure needs improvement. Due to highly perishable characteristic of seafood, delivery factors matter when purchasing online. Online platforms needs to continue to improve delivery service. Seafood products are mostly not branded and without objective information about their properties. Creating quality classification and seafood brands are likely to help consumers chose seafood online.

• 적정기술학회지
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• 제6권2호
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• pp.183-189
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• 2020

개발도상국은 빈약한 식수 인프라로 인해 식수공급에 어려움을 겪고 있으며 식수가 공급되지 않는 지역에서는 지하수를 주된 식수원으로 이용하는 경우가 많다. 하지만 지하수의 경우 다양한 오염원에 노출되어 있고 이로 인한 문제가 발생하기도 한다. 특히 해안지역은 그 지리적 특성으로 인해 해수침투에 노출되기 쉽고 해수침투에 노출된 지역의 지하수는 일반적인 경우보다 높은 염도를 가지는 경향이 있다. 만약 염도가 높은 지하수를 지속적으로 마시게 된다면 심장 및 신장질환 등 인체에 다방면으로 치명적인 영향을 끼치는 원인이 될 수 있기에 주의가 필요하다. 본 연구에서는 해수침투가 일어난 지역에서의 탈염을 위한 기술인 CDI(Capacitive Deionization)와 역삼투의 원리를 이용한 RO(Reverse Osmosis)의 적용가능성을 탐색해보고자 하며, 염수 농도에 따른 정수성능 실험을 진행하여 탈염성능을 평가해 보고자 한다. 또한 개발도상국의 일부 지역은 전력이 원활하게 보급되지 않는 경우가 많기에 본 연구에는 정수하는데 실제 사용하는데 필요한 소비전력을 계산하여 평가에 포함하고자 한다. 이를 통해 개발도상국 해수침투지역에 적합한 탈염기술을 제안할 수 있을 것으로 기대한다.

• Geomechanics and Engineering
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• 제29권3호
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• pp.207-218
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• 2022

In submerged floating tunnels (SFTs), a next-generation maritime transportation infrastructure, the tunnel module floats in water due to buoyancy. For the effective and economical use of SFTs, connection with the ground is inevitable, but the stability of the shore connection is weak due to stress concentration caused by the displacement difference between the subsea bored tunnel and the SFT. The use of an elastic joint has been proposed as a solution to solve the stability problem, but it changes the dynamic characteristics of the SFT, such as natural frequency and mode shape. In this study, the finite element method (FEM) was used to simulate the elastic joints in shore connections, assuming that the ground is a hard rock without displacement. In addition, a small-scale model test was performed for FEM model validation. A parametric study was conducted on the resonance behavior such as the natural frequency change and velocity, stress, and reaction force distribution change of the SFT system by varying the joint stiffness under loading conditions of various frequencies and directions. The results indicated that the natural frequency of the SFT system increased as the stiffness of the elastic joint increased, and the risk of resonance was the highest in the low-frequency environment. Moreover, stress concentration was observed in both the SFT and the shore connection when resonance occurred in the vertical mode. The results of this study are expected to be utilized in the process of quantitative research such as designing elastic joints to prevent resonance in the future.

• Journal of Acupuncture Research
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• 제38권3호
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• pp.183-191
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• 2021

Sa-am acupuncture originated in the Chosun Dynasty and is a distinct feature of Korean medicine. It has been used to treat various diseases and conditions in clinical practice however, there is insufficient scientific evidence to support the use of Sa-am acupuncture. We aimed to comprehensively review the clinical studies of Sa-am acupuncture retrieved from national and international databases (MEDLINE, EMBASE, the China National Knowledge Infrastructure, and 3 Korean databases). There were 52 articles reviewed including 29 case studies, 19 randomized controlled trials (RCTs), and 4 uncontrolled trials. Neurological disorders were the most frequently studied, and kidney tonification, and directional supplementation and draining were the most frequently used methods. Overall, the outcomes were generally positive however, there were many additional treatments together with Sa-am acupuncture reported in the case reports, and the quality of evidence was low in the RCTs. Future studies should report the detailed method of practicing Sa-am acupuncture treatment and focus on the specific effect of Sa-am acupuncture with rigorous design to scientifically support the clinical use of Sa-am acupuncture.