• 인터넷정보학회논문지
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• 제15권6호
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• pp.85-97
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• 2014

IoT 디바이스는 사용자의 주변에 설치되어 네트워크를 통해 다양한 정보를 수집하고, 디바이스간 협업으로 교통 정보를 제공하거나 날씨 정보를 제공하는 등 삶의 질을 향상시키는데 목적이 있다. 현재 여러 연구소나 기업체에서 다양한 IoT 디바이스들이 개발중에 있어 디바이스의 수가 급격하게 증가하고 있다. 그런데, 이러한 경향에도 불구하고 IoT 디바이스들을 관리하고 연결하는 IoT 컴퓨팅과 관련된 연구는 아직 초기 단계에 있다. IoT 컴퓨팅 환경 내에 대량의 IoT 디바이스가 동시에 존재하게 되는데, 이때 이들 디바이스들을 모니터링 하거나 제어를 위한 관리 노드로서 서버가 필요하다. 그렇지만, 어떤 관리 서버를 어디에 몇 대를 배치해야 하는지 알기 어렵다. 이러한 문제를 해결하기 위해서, 본 논문에서는 대량의 디바이스들을 논리적으로 근접한 디바이스들은 하나의 클러스터로 관리하는 기법을 제안한다. 제안된 동적 클러스터링 기법을 IoT 컴퓨팅 환경에 적용하게 되면 대량의 IoT 디바이스들을 최적의 상태로 클러스터링 함으로써, 디바이스 관리에 대한 오버헤드를 줄이면서 효율적으로 품질 관리를 할 수 있게 된다.

• Computers and Concrete
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• 제31권5호
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• pp.457-468
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• 2023

Buildings, bridges, and dams are examples of civil infrastructure that play an important role in public life. These structures are prone to structural variations over time as a result of external forces that might disrupt the operation of the structures, cause structural integrity issues, and raise safety concerns for the occupants. Therefore, monitoring the state of a structure, also known as structural health monitoring (SHM), is essential. Owing to the emergence of the fourth industrial revolution, next-generation sensors, such as wireless sensors, UAVs, and video cameras, have recently been utilized to improve the quality and efficiency of building forensics. This study presents a method that uses a target-based system to estimate the dynamic displacement and its corresponding dynamic properties of structures using UAV-based video. A laboratory experiment was performed to verify the tracking technique using a shaking table to excite an SDOF specimen and comparing the results between a laser distance sensor, accelerometer, and fixed camera. Then a field test was conducted to validate the proposed framework. One target marker is placed on the specimen, and another marker is attached to the ground, which serves as a stationary reference to account for the undesired UAV movement. The results from the UAV and stationary camera displayed a root mean square (RMS) error of 2.02% for the displacement, and after post-processing the displacement data using an OMA method, the identified natural frequency and damping ratio showed significant accuracy and similarities. The findings illustrate the capabilities and reliabilities of the methodology using UAV to evaluate the dynamic properties of structures.

• 한국지리정보학회지
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• 제9권2호
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• pp.11-19
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• 2006

하수관망은 인간의 삶을 증진시키거나 홍수와 같은 재해를 예방한다. 그러나 우리나라의 경우 하수처리시설에 대하여 관심을 가질 뿐, 관로에 대한 관리는 지도(map)의 수준에서 벗어나지 못하고 있다. 선형 객체의 경우 한 개의 선형에 단일 속성만 존재한다. 이 한계로 인하여 하수관거와 같은 선형 속성은 관리하기 힘들고, 선형의 부분적인(point type, line type) 속성 변화는 처리할 수 없다. 이에 본 연구는 속성 변화를 적용시킬 수 있는 방법을 찾고 적용하고자한다. 이를 위하여 Dynamic Segmentation을 이용하였다. DS는 선형객체 상의 정확한 위치에 속성값을 부여할 수 있는 장점을 가지고 있다. 이를 이용하여 하수관거 주위의 다양한 환경 변화를 적용 시킬 수 있었다. 또한 관거별 최대하수량을 정밀하게 계산할 수 있었다.

• BMB Reports
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• 제53권1호
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• pp.56-63
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• 2020

The ubiquitin-proteasome system (UPS) and autophagy are two major degradative pathways of proteins in eukaryotic cells. As about 30% of newly synthesized proteins are known to be misfolded under normal cell conditions, the precise and timely operation of the UPS and autophagy to remove them as well as their tightly controlled regulation, is so important for proper cell function and survival. In the UPS, target proteins are labeled by small proteins called ubiquitin, which are then transported to the proteasome complex for degradation. Alternatively, many greatly damaged proteins are believed to be delivered to the lysosome for autophagic degradation. Although these autophagy and UPS pathways have not been considered to be directly related, many recent studies proposed their close link and dynamic interconversion. In this review, we'll focus on the several regulatory molecules that function in both UPS and autophagy and their crosstalk. Among the proposed multiple modulators, we will take a closer look at the so-called main connector of UPS-autophagy regulation, p62. Last, the functional role of p62 in the mitophagy and its implication for the pathogenesis of Parkinson's disease, one of the major neurodegenerative diseases, will be briefly reviewed.

• 사회복지연구
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• 제49권2호
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• pp.5-38
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• 2018

본 연구는 한국사회 기혼남녀의 일-생활 균형의 문제를 시간표 분석을 통해 파악하는 것을 목적으로 한다. 이를 위해 2014년도 통계청 생활시간조사 시간대자료를 이용하여 3,131쌍 기혼부부의 6,262개의 시간일지를 분석하였다. 분석 방법으로는 시간양뿐 아니라 시간배치를 고려한 전체적인 분석을 위해 배열분석을 사용하였으며, 이때 Lesnard(2014)의 DHM(Dynamic Hamming Matching) 방식으로 배열 간 거리를 산출하여 타이밍을 중시하는 시간분석에 무리가 없도록 조치하였다. 구체적으로는, 군집분석을 통해 도출된 부부결합의 가구노동시간 9개 유형별로, 남녀 각각의 노동, 가사, 수면, 자기관리, 적극적 여가, 소극적 여가, 기타로 구성된 일과 생활시간의 평균시간양과 시간대별 분포와 최빈상태의 그래프를 산출하여 해석하였다. 이러한 분석결과를 종합하여, 일-생활 불균형된 시간구성의 특성으로 '만연된 장시간노동', '젠더불평등한 시간배분', '비표준시간대 노동으로 인한 삶의 질 하락', '여가시간의 부족'을 지목하였으며, 마지막으로는 이러한 결과에 기초해 일-생활 균형을 높이기 위한 사회복지의 실천적 정책적 함의를 논의하고 후속연구를 제언하였다.

• 영재교육연구
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• 제22권3호
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• pp.703-728
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• 2012

이 연구의 목적은 초등 과학 영재를 교수 및 평가하는 데 있어 종래의 정적 방법이 아닌 역동적 방법을 채택하여 전기회로 개념 이해 과정을 분석해 보는 것이다. 초등 과학 영재 11명을 대상으로 과학적인 전기회로 개념으로의 이해를 의도한 역동적 과학 평가를 실시하여 스캐폴딩 양상을 중심으로 변화 과정을 알아보고, 영재학생의 개념 변화 과정에서 나타나는 특징을 분석하였다. 연구 결과 첫째, 역동적 과학 평가를 통해 초등 과학영재의 개념 이해에 유용한 스캐폴딩 투입 특성을 확인하였다. 둘째, 역동적 과학 평가 전략에 의한 개념 정립이 개별 학생의 특성에 따라 다양한 방식으로 나타났다. 셋째, 전기회로 개념 이해의 각 장면에서 효과적으로 작용했던 전략을 확인할 수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권7호
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• pp.996-1006
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• 2019

Objective: This study aimed to gain deeper insights into the dynamic changes in spoilage fungi populations during fermentation and the influence of traditional additives on silage quality. Methods: Elephant grass (Pennisetum purpureum) was prepared without any additive (control), and with the addition of 0.5% salt, and 0.5% salt-0.2% sugar mixture. The fungal community was then determined using a classic culturing method and high-throughput sequencing at 0, 5, 15, and 60 days after ensiling. Results: The results showed that the fungal community of elephant grass silage varied significantly between the natural fermentation without any additive and the two additive groups. The diversity and relative abundance of spoilage molds in the control group were much higher than those in the two treatment groups (p<0.05). Three species of yeasts (Candida sp., Pichia sp., Trichosporon sp.) and four spoilage molds (Fusarium sp., Aspergillus sp., Muco sp. and Penicillin sp.) were the predominant fungi in elephant grass during natural fermentation from 0 to 60 days, which were found to be significantly decreased in salt and sugar additive groups (p<0.05). Meanwhile, the diversity and relative abundance of undesirable molds in the 0.5%-salt additive group were the lowest among all groups. Conclusion: Adding salt and sugar, particularly 0.5% salt, is a promising effective approach to reduce the amount of undesirable fungi thus, improving the silage quality of elephant grass in northern Vietnam.

• International Journal of Advanced Culture Technology
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• 제12권2호
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• pp.72-89
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• 2024

Depression is a common disorder among the elderly, significantly affecting their quality of life. Traditional dance interventions, although beneficial, have limitations in convenience, personalization, and retention. With the advent of digital technology, digital dance interventions have emerged as a potential solution to these limitations. This paper involves an extensive review of literature on digital dance interventions. Research databases were searched for studies that focus on the use of digital dance in treating depression among older adults. The review also includes analyses of the advancements in digital dance technology, its application in therapeutic settings, and the evaluation of its efficacy. The paper identifies three main challenges in the current digital dance intervention research: real-time dynamic assessment, multimodal dance generation, and improving compliance. Despite these challenges, digital dance interventions show promise in addressing the limitations of traditional dance therapy. The research suggests that the integration of human-computer interaction and personalized approaches in digital dance interventions could significantly improve outcomes in elderly patients with depression. Digital dance interventions represent a novel and promising approach to treating depression in older adults. Future research should focus on overcoming the identified challenges and enhancing the effectiveness of these interventions.

• 연구논문집
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• 통권27호
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• pp.57-73
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• 1997

The bogie between the track and the railway vehicle body, is one of the most important component in railroad vehicle. Its effects on the safety of both passengers and vehicle itself, and on the overall performance of the vehicle such as riding quality, noise and vibration are critical. The bogie is mainly consisted of the bogie frame, suspensions, wheels and axles, braking system, and transmission system. The complex shapes of the bogie frame and the complicate loading condition (both static and dynamic) induced in real operation make it difficult to design the bogie frame fulfilling all the requirements. The complicated loads applied to the bogie frame are i) static load due to the weight of the vehicle and passengers, ii) quasi-static load due to the rolling in curves iii) dynamic load due to the relative motion between the track, bogie, and vehicle body. In designing the real bogie frame, fatigue analysis based on the above complicated loading conditions is a must. In this study, stress analysis of the bogie frame has been performed for the various loading conditions according to the UIC Code 6 15-4. Magnitudes of the stress amplitude and mean stress were estimated based on the stress analysis results to simulate the operating loads encountered in service. Fatigue strength of the bogie frame was evaluated by using the constant life diagram of the material. 3-D surface modelling, finite element meshing, and finite element analysis were performed by Pro-Engineer, MSC/PATRAN, and MSC/NASTRAN, respectively.

• 한국시스템다이내믹스연구
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• 제8권2호
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• pp.141-173
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• 2007

In Korean context, the innovative cities imply new towns or urban clusters in the Non Capital Regions, all of which would accommodate the relocated Capital based public organizations. The central government-initiated innovative cities have provoked pros and cons towards their effectiveness and efficacy for the balanced territorial development. From a broader prospective, this paper firstly examines the current status quo of the innovative cities. Based on their master plans, it analyzes physical and non physical factors which would exert significant impact on the innovative cities. Secondly, it pays attention to how key factors strengthen or weaken their behavioral patterns in terms of dynamic location and implementation policies of the innovative cities. Using System dynamics approaches, it sets up couples of scenarios, categorizing between supporting and opposing arguments towards the innovative cities. Lastly, after divulging systematic structure of the innovative cities, it proposes a series of practical alternatives which would contribute to minimizing unexpected side effects or unwanted social cost in the long run. In order to guarantee reinforcing structure of the innovative cities, the paper suggests that QOL (quality of life) variables, which would require continuous investment in the social infrastructure, are pivotal in achieving original goals of the innovative cities. Otherwise, the innovative cities would not be innovative per se. In the worst case, they might be degraded into the unpopular ghost towns.