• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 3차
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• pp.125-128
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• 2010

A large quantity of purified water sludge is generated in modern cities around the world. Dewatering is essential to reduce the volumes transported off-site for disposal. Traditionally employed methods such as solar drying methods are time-consuming. There are urgent demands for developing alternatives to dewater the sludge in a less time-consuming manner. In this paper, siphon method is proposed to dewater the high-water-content sludge with plastic drainage plate installed horizontally. A group of comparative tests are conducted to preliminarily investigate the dewatering behavior of the purified water sludge with siphon and solar drying methods, respectively. On the basis of the test results, the availability and effectiveness of the new method is verified. It may provide an innovative solution to treat the purified water sludge more effectively.

• 비교교육연구
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• 제18권4호
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• pp.1-26
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• 2008

이 연구는 비교교육학의 개념과 중요성을 살펴보고, 우리나라 비교교육학의 역사와 발전과정, 그리고 현재 대학에서 이루어지고 있는 비교교육학의 현황과 실태를 연구하고자 하였다. 우리나라의 비교교육학은 다른 교육학의 세부전공들과 비교하여 나름대로 독자적인 학문분야로서의 정체성을 확립한지 그리 오래되지 않았기 때문에 아직도 대학에서 독립적인 전공분야로 자리매김하고 있지는 않으나, 최근 국제화 추세와 더불어 외국교육과 관련된 다양한 분야, 예컨대 외국의 교육제도, 교육정책, 교육개혁 동향 등에 대한 관심이 증대되면서 비교교육학의 학문적 중요성과 그 활용이 강조되고 있다. 이에 동 연구는 우리나라 대학에서의 비교교육학 교육현황에 대한 전반적 실태를 알아보기 위하여 첫째, 한국대학에서의 비교교육학 발전과정을 살펴보고, 둘째, 한국 대학에서의 비교교육학 교육현황을 조사하였다. 현황 조사는 다음과 같은 다섯 항목 1) 4년제 대학 중 비교교육 관련 강좌를 제공하는 대학(수), 2) 비교교육 관련 강좌의 수업목표, 3) 커리큘럼 및 강좌명, 4) 강의 방법과 교재현황, 5) 한국대학의 비교교육 강좌와 관련된 문제점 및 제언 등으로 나누어, 전국 4년제 대학을 대상으로 설문과 인터뷰 조사를 실시하였다. 이와 더불어, 한국 비교교육학의 실태에 대한 외국과의 비교분석을 위하여 외국 대학들의 비교교육학 발전과정과 교육동향을 문헌연구를 통해 알아보았다. 동연구는 우리나라 대학 비교교육학 교육현황에 대한 첫 조사연구로서, 대학에서의 비교교육학 강좌의 필요성과 중요성에 대한 재확인과 함께 외국 대학의 비교교육학 발전현황에 대한 탐색을 통하여 우리나라 비교교육학의 발전 방향에 대한 시사점을 얻고자 하였다.

• 한국측량학회지
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• 제30권6_2호
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• pp.593-605
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• 2012

LiDAR systems provide dense and accurate topographic information. A pre-requisite to achieving the potential accuracy of LiDAR is having a proper system calibration, which aims at estimating all the systematic errors in the system measurements and the mounting parameters relating the different components. This paper presents a rigorous and two approximate methods for LiDAR system calibration. The rigorous approach makes use of the LiDAR equation and the system raw measurements. The approximate approaches utilize simplified LiDAR equations using some assumptions, which allow for less strict requirements regarding the raw measurements. The first presented approximate method, denoted as quasi-rigorous, assumes that we are dealing with a vertical platform (i.e., small pitch and roll angles). This method requires time-tagged point cloud and trajectory position data. The second approximate method, denoted as simplified, assumes that we are dealing with parallel strips, vertical platform, and minor terrain elevation variations compared to the flying height above ground. Such method can be performed using the LiDAR point cloud only. Experimental results using a real dataset, whose characteristics deviate to some extent from the utilized assumptions in the approximate methods, are presented to provide a comparative analysis of the outcome from the introduced methods.

• 품질경영학회지
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• 제49권1호
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• pp.47-60
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• 2021

Purpose: This study proposes methods and procedures for evaluating imaging security systems quality of cabinet x-ray screening system to enhance performance certification technology. Also, conducted a comparative analysis of the literature of test-kit for imaging security quality evaluation. Methods: Comparative analysis of the test-kits and related documents for image quality assessment of cabinet x-ray screening equipment. This allows assessment items were selected and the methods for each assessment item were proposed. In addition, the configuration method of the assessment team was established by applying the technology readiness assessment(TRA). Results: Four of the assessment items were selected when estimate image quality by a comparative analysis of literature. For each assessment item, the evaluation method and minimum level of availability were determined. Finally, this paper proposes an imaging quality assessment of cabinet X-ray imaging security systems. Conclusion: Development of imaging security systems evaluation procedures for cabinet X-ray screening systems can be help improve performance certification of aviation security equipment.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2003년도 봄 학술발표대회논문집
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• pp.112-113
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• 2003

• 수산해양기술연구
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• 제54권2호
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• pp.124-137
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• 2018

Due to the decrease in coastal productivity and deterioration in the quality of ecosystem which result from the excessive overfishing of fisheries resources and the environmental pollution, fisheries resources in the Korean waters hit the dangerous level in respect of quantity and quality. In order to manage sustainable and effective fisheries resources, it is necessary to suggest the potential yield (PY) for clarifying available fisheries resources in the Korean waters. So far, however, there have been few studies on the estimation methods for PY in Korea. In addition, there have been no studies on the comparative analysis of the estimation methods and the substantial estimation methods for PY targeted for large marine ecosystem (LME) For the reasonable management of fisheries resources, it is necessary to conduct a comprehensive study on the estimation methods for the PY which combines population dynamics and ecosystem dynamics. To reflect the research need, this study conducts a comparative analysis of estimation methods for the PY in the Korean waters of the East Sea to understand the advantages and disadvantages of each method, and suggests the estimation method which considered both population dynamics and ecosystem dynamics to supplement shortcomings of each method. In this study, the maximum entropy (ME) model of the holistic production method (HPM) is considered to be the most reasonable estimation method due to the high reliability of the estimated parameters. The results of this study are expected to be used as significant basic data to provide indicators and reference points for sustainable and reasonable management of fisheries resources.

• 대한원격탐사학회지
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• 제39권4호
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• pp.371-393
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• 2023

Crack detection in structures plays a vital role in ensuring their safety, durability, and reliability. Traditional crack detection methods sometimes need significant manual inspections, which are laborious, expensive, and prone to error by humans. Deep learning algorithms, which can learn intricate features from large-scale datasets, have emerged as a viable option for automated crack detection recently. This study presents an in-depth review of crack detection methods used till now, like image processing, traditional machine learning, and deep learning methods. Specifically, it will provide a comparative analysis of crack detection methods using deep learning, aiming to provide insights into the advancements, challenges, and future directions in this field. To facilitate comparative analysis, this study surveys publicly available crack detection datasets and benchmarks commonly used in deep learning research. Evaluation metrics employed to check the performance of different models are discussed, with emphasis on accuracy, precision, recall, and F1-score. Moreover, this study provides an in-depth analysis of recent studies and highlights key findings, including state-of-the-art techniques, novel architectures, and innovative approaches to address the shortcomings of the existing methods. Finally, this study provides a summary of the key insights gained from the comparative analysis, highlighting the potential of deep learning in revolutionizing methodologies for crack detection. The findings of this research will serve as a valuable resource for researchers in the field, aiding them in selecting appropriate methods for crack detection and inspiring further advancements in this domain.

• Safety and Health at Work
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• 제12권2호
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• pp.230-237
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• 2021

Background: Noise-induced hearing loss is a well-known occupational disease that affects many fish harvesters from many fisheries worldwide, whose risk factor is prolonged exposure to hazardous noise levels. To date, academic research activities and regulatory bodies have not provided any comparative analysis among the existing methods to assess noise exposure levels of fish harvesters. This paper provides a comparison of four relevant assessment methods of noise exposure, examining the results of a measurement campaign performed onboard small fishing vessels from Newfoundland and Labrador. Methods: We traveled onboard 11 vessels engaged in multiple fisheries from Newfoundland and Labrador and performed extensive noise exposure surveys using the simplified International Maritime Organization method, the full-day measurement method, and the two methods provided by ISO 9612:2009, the task-based method and job-based method (JBM). Results: The results showed that the four methods yield similar values when the noise components are dominated by the engine and auxiliaries (steady-state sources); when noise components are dominated by the fishing gear, task-based method and the simplified International Maritime Organization method estimates are less accurate than JBM, using full-day measurements as baseline. Conclusion: The JBM better assesses noise exposure in small-scale fisheries, where noise exposure has significant variance and uncertainties on the exposure levels are higher.

• 한국언론정보학보
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• 제39권
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• pp.428-472
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• 2007

본 연구에서는 '부당한 비교표시 광고'의 법리적 특성은 어떻게 해석되어 적용되고 있는가를 알아내기 위해 공정거래위원회의 심결사례를 분석하였다. 7년 동안 '부당하게 비교하는 표시 광고'로 분류된 심결사례는 38건이었으나 실제로 부당 비교표시 광고로 심결된 사건은 17건이었다. 이러한 오류의 이유는 위반 내용 중 '비교'라는 표현이 있는 경우는 모두 비교광고의 범주에 포함시켰기 때문으로 추정된다. 결과에 의하면, 부당 비교표시 광고의 '부당성' 유형으로는 비교대상 5건, 비교기준 11건, 비교내용 7건 및 비교방법 4건(중복 적용 수)으로 나타났는데 각 부당행위에는 '기만' 또는 '허위 과장'적 요소가 중복으로 존재하고 있었다. 이와 같은 결과들로 미루어 부당한 비교표시 광고의 '부당성'의 의미를 '기만,' '허위 과장', '비교' 및 '비방' 등의 개념들과 상호 복합적으로 고려하여 보다 명확히 규명할 필요가 있으며 의미 적용적 측면에서 합리적인 법 운용방법을 모색해야 할 것이다. 그리고 이러한 개선방안들은 무엇보다도 표시 광고법의 입법목적인 소비자 보호적 차원에서 이루어져야 할 것이다.

• Journal of Veterinary Science
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• 제23권1호
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• pp.16.1-16.13
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• 2022

Background: Xylazole (Xyl) is a veterinary anesthetic that is structurally and functionally similar to xylazine. However, the effects of Xyl in vitro remain unknown. Objectives: This study aimed to investigate the anesthetic mechanism of Xyl using fetal rat nerve cells treated with Xyl. Methods: Fetal rat nerve cells cultured for seven days were treated with 10, 20, 30, and 40 ㎍/ mL Xyl for 0, 5, 10, 15, 20, 25, 30, 45, 60, 90, and 120 min. Variations of amino acid neurotransmitters (AANTs), Nitric oxide-Cyclic GMP (NO-cGMP) signaling pathway, and ATPase were evaluated. Results: Xyl decreased the levels of cGMP and NO in nerve cells. Furthermore, Xyl affected the AANT content and Na⁺-K⁺-ATPase and Ca²⁺-Mg²⁺-ATPase activity in nerve cells. These findings suggested that Xyl inhibited the NO-cGMP signaling pathway in nerve cells in vitro. Conclusions: This study provided new evidence that the anesthetic and analgesic effects of Xyl are related to the inhibition of the NO-cGMP signaling pathway.