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An Approach for Segmentation of Airborne Laser Point Clouds Utilizing Scan-Line Characteristics

  • Han, Soo-Hee;Lee, Jeong-Ho;Yu, Ki-Yun
    • ETRI Journal
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    • v.29 no.5
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    • pp.641-648
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    • 2007
  • In this study, we suggest a new segmentation algorithm for processing airborne laser point cloud data which is more memory efficient and faster than previous approaches. The main principle is the reading of data points along a scan line and their direct classification into homogeneous groups as a single process. The results of our experiments demonstrate that the algorithm runs faster and is more memory efficient than previous approaches. Moreover, the segmentation accuracy is generally acceptable.

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Electrolytic Conductance Measurement using Four-Electrode Cell and Potentiometric Circuit (포텐티오메트릭 4-전극 용기에 의한 전도도 측정)

  • Jung-Kyoon Chon;Woon-kie Paik
    • Journal of the Korean Chemical Society
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    • v.20 no.2
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    • pp.129-135
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    • 1976
  • A direct-reading conductance measuring system using a potentiostatic circuit and a four-electrode conductance cell was devised. The difficulties with the traditional method of using the Wheatston bridge and a two-electrode cell due to the complicated nature of the electrochemical system, the double layer capacitance and the Faradaic impedance at the electrodes, etc., could be avoided in this method. The devised instrument proved to be convenient and suitable for precise measurements. The results of measured conductivities of KCl and HCl solutions are reported.

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Feasibility Study of Laser Contact Angle Measurement for Nano-fiber Characterization (나노섬유의 특성분석을 위한 레이저 접촉각 측정기의 효율성 연구)

  • 신경인;안선훈;김성훈
    • Journal of the Korean Society of Clothing and Textiles
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    • v.27 no.5
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    • pp.554-559
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    • 2003
  • A newly developed contact angle measurement instrument by laser beam projection allows for rapid and direct determination of contact angles. The instrument may have a possibility to characterize newly developed nano-fibers. When the laser beam impinges on an edge of an interface of liquid and solid, projected beam were split across and made two straight lines on a tangent screen. From the result, it could measure the contact angle directly by reading the angle between two split beams. The purpose of this study was to prove reliability and reproducibility of the contact angle measurement instrument by laser beam projection compare to the conventional one by microscope through the comparative experiment and questionnaire. Test samples were selected by consideration of hydrophilic and hydrophobic, such as nylon 6 and polypropylene, respectively. The laser contact angle measurement has accurate, fast and convenient method to measure contact angle, and it can be a unique method to characterize nano-fibers.

Toluene Determination in Workplace by Charcoal Tube Method (Charcoal Tube에 의(依)한 작업환경중(作業環境中) Toluene 함량(含量)에 관(關)한 연구(硏究))

  • Kim, Hyung-Suk;Koo, Do-Suh;Park, Yang-Won;Lee, Jeong-Whan
    • Journal of Preventive Medicine and Public Health
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    • v.16 no.1
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    • pp.193-198
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    • 1983
  • In the determination of organic solvents in workplaces direct reading tube method have been used in Korea for decades. But this method is less accurate and couldn't measure TWA(Time Weighted Average) for 8 hours. Authors tried to detect Toluene concentration in S factory by using charcoal tube according to NIOSH method. The concentration was 158.8ppm. We propose this charcoal tube method should be substituted to get accurate results and to protect employee in workplaces related with solvents.

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An Implementation of an Open Source Based H.264 Video Player for Bluetooth Input (블루투스 입력의 오픈 소스기반 H.264 비디오 플레이어의 구현)

  • Park, Taejun;cho, Tai-Hoon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.193-195
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    • 2009
  • Bluetooth is a popluar wireless data transmission method with low power consumption. In this paper, we present a open source based player of video stream encoded by H.264 codec, which is transmitted via Bluetooth. An open source JM is used for H.264 decoding and modified for reading H.264 encoded data via Bluetooth. For display of decoded video data, SDL was utilized.

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Measurement and Analysis of Odors Generated in Traditional Markets

  • KIM, Su-Hye;CHO, Dong-Myung;KWON, Lee-Seung;JUNG, Min-Jae
    • Journal of Wellbeing Management and Applied Psychology
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    • v.4 no.4
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    • pp.35-41
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    • 2021
  • Purpose: The purpose of this study is to identify the causes of odors generated in traditional markets and to suggest appropriate application technologies to solve them. Research design, data and methodology: In order to achieve the purpose of this study, complex malodors, TVOC, and hydrogen sulfide were measured three times at each point in Wonju-city, Gangwon-do using direct-reading odor measuring equipment in Joong-ang Traditional Market's Korean beef Alley, Sundae Alley, and Joong-ang Citizens Traditional Market. Therefore, the average value was compared with the emission standard and analyzed. Results: As a result of the study, complex malodors exceeded the emission standards at all points, and hydrogen sulfide exceeded the emission standards at all except for one point. Conclusions: The odor generated in the traditional market has various causes and low concentration, so it is necessary to reduce the odor by using an appropriate technology.

Baby Lazarus: Listening to the Rebirths in "Lady Lazarus"

  • Lee, Jaehoon
    • American Studies
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    • v.43 no.2
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    • pp.83-110
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    • 2020
  • This paper examines the meaning and significance of the rebirths narrated in Sylvia Plath's "Lady Lazarus." While the previous readings of the poem have regarded the speaker's rebirth as a single event, this paper aims to understand its plurality and the underlying problem of language and sound by listening to the poet's own reading of the poem. I argue first that the sound structure of the poem can be characterized by the poet's unique employment of vowel sounds. Drawing upon Plath's another poem entitled "Morning Song" and Julia Kristeva's concept of the chora, I contend that the poet's vowels signal her desire for regression to the pre-Oedipal space where sound and body are in direct contact without the interference of language. It is my conclusion that the rebirths in "Lady Lazarus" dramatize the poet's ongoing struggle to bypass the symbolic language in order to make her body heard.

A Study of the Law School Library Design Feature & Spatial Composition (법학전문도서관 디자인 특성 및 공간구성방법에 관한 연구)

  • Choi, Sung-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.6
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    • pp.2812-2825
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    • 2012
  • The purpose of this study was to analyze the spacial composition feature of Law School Library and define the feature in spacial planning of law school library. Through the analysis of characteristics in spacial composition, the basic spacial type of law school library will be proposed as a new law school library design. The spatial composition characteristics of Law school Library are as followings. (1) Entry spatial feature for the user accessibility (2) Reference room spatial planning for carrel user (3) Connectivity of educational & research space and reference room space. As the result of design proposal and analyzing the spacial feature, firstly entry common space of library should be planned with reference room space. Secondly, reading room should be linked to the entry level for the user. Lastly, core space should be planned as the vertical connectivity space for the intimately linkage of educational & research space and reference room. And separated accessibility should be considered for direct connection from outdoor space.

Analysis of Deliberations by UNCITRAL Working Group on the Draft Revised Version of UNCITRAL Arbitration Rules (UNCITRAL 중재규칙(仲裁規則) 개정초안(改正草案) 내용(內容)의 분석(分析)과 방향검토(方向檢討))

  • Kang, Pyoung-Keun
    • Journal of Arbitration Studies
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    • v.18 no.2
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    • pp.3-31
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    • 2008
  • At its thirty-ninth session(New York, 19 June - 7 July 2006), United Nations Commission on International Trade Law(hereinafter referred to as the Commission) agreed to give priority to the topic of revising the UNCITRAL Arbitration Rules. From the forty-fifth through the forty-seventh session, the Working Group checked various issues based on the draft revised version of the UNCITRAL Arbitration Rules prepared by the Secretariat. At its forty-eighth session, the Working Group is going to finish its first reading of articles 38 to 41 of the draft revised version of the UNCITRAL Arbitration Rules, and to commence its second reading of the draft revised version of UNCITRAL Arbitration Rules. Korea is keen on enticing foreign direct investment into its territory. From the 1960s, Korea has concluded more than 80 BITs. Korea is making efforts to conclude FTAs with its trading partners. As of January, 2008, 3 FTAs have taken into effect with respect to Korea. According to provisions on dispute settlement found in such BITs and FTAs involving Korea, the Rules can be chosen for Investor-State Arbitration. Furthermore, the Rules is followed by the arbitration rules for domestic and international arbitrations administered by the Korean Commercial Arbitration Board. If the Commission adopts the revised version of UNCITRAL Arbitration Rules, the Rules will be able to give impact on the arbitration law and practice around the world of arbitration. That is the reason why we should keep attention to the development of the deliberations of the Working Group.

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Volumetric measurement of the tongue and oral cavity with cone-beam computed tomography: A systematic review

  • Kannitha Alina, Aflah;Winny, Yohana;Fahmi, Oscandar
    • Imaging Science in Dentistry
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    • v.52 no.4
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    • pp.333-342
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    • 2022
  • Purpose: The goal of this systematic review was to compare the use of cone-beam computed tomography (CBCT) with that of computed tomography (CT) for volumetric evaluations of the tongue and oral cavity. Materials and Methods: A search for articles was conducted in accordance with the Preferred Reporting Items for Systematic Review and Meta-analyses guidelines. The PubMed, Scopus, ScienceDirect, and SAGE Journals databases were searched for articles published between 2011 and 2021. Articles were screened and assessed for eligibility. Screening involved checking for duplication, reading the title and abstract, and reading the full text. Results: The initial search retrieved 25,780 articles. Application of the eligibility criteria yielded 16 articles for qualitative analysis. Multiple uses of CBCT were identified. In several studies, researchers assessed the volumetric correlation between tongue and oral cavity volumes, as well as other parameters. Post-treatment volumetric evaluations of the oral cavity were also reported, and the reliability of CBCT was assessed. The use of CT resembled that of CBCT. Conclusion: CBCT has been used in the evaluation of tongue and oral cavity volumes to assess correlations between those volumes and with the upper airway. It has also been used for volumetric evaluation after surgical and nonsurgical procedures and to assess the relationships between tongue volume, tooth position, occlusion, and body mass index. Participants with obstructive sleep apnea and malocclusion have been evaluated, and the reliability of CBCT has been assessed. In the included studies, CT was utilized for similar purposes as CBCT, but its reliability was not assessed.