• Title/Summary/Keyword: Fishbone

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A study on RF characteristics of fishbone-type transmission line on PES substrate for application to flexible wireless communication device (플렉시블 무선통신소자 응용을 위한 PES 박막상의 Fishbone 형태의 전송선로에 대한 RF 특성연구)

  • Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.3
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    • pp.302-311
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    • 2014
  • In this work, a FTTL (fishbone-type transmission line) structure was fabricated on PES (polyether sulfone) for a realization of transparent flexible wireless communication device, and its RF characteristics were investigated. According to the results, the FTTL on PES showed a short wavelength characteristic compared with conventional coplanar waveguide. Concretely, the wavelength of the FTTL was 2.23 mm at 50 GHz, which was 56.6 % of the conventional coplanar waveguide. According to the bandwidth extraction result, the passband of the FTTL on PES was 608 GHz. Unlike conventional periodic structures, the characteristic impedance of the FTTL on PES showed a very low frequency dependency, which means that the FTTL on PES can be used for application to transmission line and distributed passive components with a broadband operation frequency.

Factors Associated with Removal of Impactted Fishbone in Children, Suspected Ingestion

  • Lim, Chun Woo;Park, Min Hwan;Do, Hyun Jeong;Yeom, Jung-Sook;Park, Ji Sook;Park, Eun Sil;Seo, Ji Hyun;Park, Jung Je;Lim, Jae Young;Park, Chan Hoo;Woo, Hyang-Ok;Youn, Hee-Shang
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.19 no.3
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    • pp.168-174
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    • 2016
  • Purpose: The management and clinical course in pediatric patients who had ingested foreign body were investigated retrospectively to evaluate the frequency and factor associated with successful removal of fishbone foreign body. Methods: Based on the medical records of patients younger than 15 years old who visited emergency room because of foreign body ingestion from January 1999 to December 2012, the authors reviewed clinical characteristics including type of ingested foreign bodies, time to visits, managements and complications. Results: Fishbone (50.1%) was the most common ingested foreign body in children. Among 416 patients with ingested fishbone, 245 (58.9%) were identified and removed using laryngoscope, rigid or flexible endoscope from pharynx or upper esophagus by otolaryngologists and pediatric gastroenterologists. The kind of ingested fish bone in children was diverse. The mean age of identified and removed fishbone group was 7.39 years old, and higher than that of unidentified fishbone group (5.81 years old, p<0.001). Identified and removed fishbone group had shorter time until hospital visit than the unidentified fishbone group (2.03 vs. 6.47 hours, p<0.001). No complication due to ingested fishbone or procedure occurred. Conclusion: Older age and shorter time from accident to hospital visit were the different factors between success and failure on removal of ingested fish bone in children.

High-frequency characteristics of short-wavelength transmission line on polyether sulfone thin film for a realization of transparent flexible wireless communication device (투명 플렉시블 무선통신 소자구현을 위한 PES 박막상의 단파장 선로에 대한 고주파 특성연구)

  • Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.4
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    • pp.353-361
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    • 2016
  • This work presents an investigation of the radio frequency characteristics of an FTLPGS (fishbone-type transmission line employing periodic ground structure) fabricated on PES (polyether sulfone) for the realization of a transparent flexible wireless communication device. According to the results, the FTLPGS on PES showed a shorter wavelength characteristic when compared with a conventional coplanar waveguide. Concretely, the wavelength of the FTLPGS was 1.91 mm at 50 GHz, which was 48.5% of the conventional coplanar waveguide. The bandwidth extraction result showed that the passband of the FTLPGS on PES was 250 GHz. Unlike conventional periodic structures, the characteristic impedance of the FTLPGS on PES also showed a very low frequency dependency. A miniaturization of the RF circuit on the PES substrate was made possible by the FTLPGS on PES having shown characteristic impedance lower than that of conventional transmission lines. These results mean that, with a broadband operation frequency, the FTLPGS on PES is a suitable construction application for the transmission line and distributed passive components.

Transmittance Improvement with Reversed Fishbone-Shape Electrode in Vertical Alignment Liquid Crystal Display

  • Lim, Young Jin;Kim, Hyo Joong;Kim, Min Su;Kim, Gi Heon;Kim, Yong Hae;Lee, Gi-Dong;Lee, Seung Hee
    • Journal of the Optical Society of Korea
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    • v.20 no.6
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    • pp.794-798
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    • 2016
  • A polymer-stabilized vertical alignment (PS-VA) mode with fishbone-shaped pixel electrode structure is mainly used in large-sized liquid crystal displays (LCDs) owing to its advantages such as wide viewing angle, good transmittance and fast response time. One drawback of this mode is a main bone electrode, which crosses in the center of a pixel. It causes the transmittance to decrease badly because LCs cannot be reoriented in this region, and thus, it is particularly unfavorable in an ultra-high-definition LCD. Here, we propose an innovative structure with the main bone electrode relocated to the edge area in a pixel, and investigate how this reverse directed fishbone-shaped pixel electrode structure affects electro-optic characteristics. The proposed structure shows enhanced electro-optic performance, such as the higher transmittance and the faster response time than the conventional VA mode with fishbone-shaped pixel electrode structure.

Basic RF Characteristics of Fishbone-Type Transmission Line Employing Comb-Type Ground Plane (FTLCGP) on PES Substrate for Use in Flexible Passive Circuits

  • Yun, Young;Jeong, Jang-Hyeon;Kim, Hong Seung;Jang, Nakwon
    • ETRI Journal
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    • v.37 no.1
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    • pp.128-137
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    • 2015
  • In this work, a fishbone-type transmission line employing a comb-type ground plane (FTLCGP) was fabricated on polyethersulfone (PES) substrate, and its RF characteristics were thoroughly investigated. According to the results, it was found that the FTLCGP on PES showed periodic capacitance values much higher than other types of transmission lines due to a coupling capacitance between the signal line and ground, which resulted in a reduction of wavelength and line width. Using the theoretical analysis, we also extracted the bandwidth characteristic of the FTLCGP on PES. According to the result, the FTLCGP structure showed a cut-off frequency of 280 GHz.

A Study on the Security Improvement for Mobile Payment Systems by the Fault Fishbone Analysis (결함 어골도 분석에 의한 모바일 결제 시스템의 보안성 개선에 관한 연구)

  • Seo, Jin-Ho;Park, Man-Gon
    • Journal of Korea Multimedia Society
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    • v.21 no.1
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    • pp.26-33
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    • 2018
  • As financial transactions using mobile devices have been activated, mobile payment services have appeared and many changes have been made to the existing financial service methods. Due to the simplified payment method of mobile payment service, security threats such as personal information leakage, phishing damage, and malicious code are increasing. Research that can solve this is needed. In this paper, we discuss the features and security factors of mobile payment system. In order to improve the security of mobile payment system, we propose a fault analysis method based on frequency of occurrence using Fault Fishbone Analysis(FFA) technique.

A Study Model of Content Convergence Education for Social Problem Solving through the Analysis of Fishbone (피쉬본분석을 통한 사회문제 해결형 콘텐츠 융합 교육 연구모델 도출)

  • Lee, Jung Mann;Park, Sung Won
    • Journal of Information Technology Applications and Management
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    • v.27 no.4
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    • pp.49-62
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    • 2020
  • In this study, the research model of VR·AR contents convergence education for solving social problems was presented after benchmarking the domestic and foreign realistic educational contents industry and policy trends and Fishbone diagram analysis. The goal was to create VR·AR content convergence talent for co-prosperity in the era of the fourth industrial revolution, and the target of education was students, researchers, and business personnel who are interested in VR AR technology education and contents business such as game animation, etc. The education model is based on understanding about storytelling of the socially disadvantaged, such as children and the elderly, and is technology education for content production including the application of virtual and augmented reality SW, and is a convergence education for content planning and business model strategy development.

Strategical Approaches for Establishing Learning Organization: S-Steel Case (철강산업의 학습조직 구축을 위한 전략적 접근 : S-철강(제조업) 사례연구)

  • Park, Gi-Ho
    • 한국디지털정책학회:학술대회논문집
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    • 2007.06a
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    • pp.377-384
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    • 2007
  • This paper is about how to establish the strategic teaming organization in digital age. Through the case study of action teaming, this research can give some implications to small-sized organizations who want to establish teaming culture and positive activities in their own companies. The case site was S-steel, which belongs to the steel industry. To improve and drive teaming activities, I made use of skills: action learning, fishbone analysis, creative thinking, brainstorming, creative discussion skill, and organization diagnostic method.

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Assessment of Radionuclides(Co, Sr) Adsorption and Desorption Characteristics in Soil Using Modified Clay and Fish Bones (개질 점토 및 생선뼈를 이용한 토양 내 방사성 핵종(Co, Sr) 흡착 및 탈착 특성 평가)

  • Kang Kyungchan
    • Journal of Soil and Groundwater Environment
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    • v.28 no.6
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    • pp.58-70
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    • 2023
  • The improper management of radioactive waste or accidents caused by natural disasters can result in the release of radioactive materials into the surrounding environment, potentially leading to soil and groundwater contamination by radionuclides. In this study, adsorption-desorption behaviors of the radionuclides (cobalt and strontium) in natural soil, montmorillonite, Mn-PILC, Fe-PILC, and fishbone were investigated. Several models were used to predict adsorption isotherms of radionuclides on various absorbents. Adsorption isotherms of cobalt and strontium in several adsorbents were examined at pH 5.5. The amount of sorbed cobalt and strontium were represented fishbone > natural soil > Mn-PILC > Fe-PILC > montmorillonite and natural soil > Mn-PILC > fishbone > Fe-PILC > montmorillonite, respectively. Adsorption datas were fitted with several models such as Freundlich, Langmuir, Sips, Redlich-Peterson, Khan, and Generalized model. The results of curve fitting showed R2> 0.98 in all of adsorption models, except Sr2+ adsorption onto montmorillonite. For modified clays (Mn-PILC, Fe-PILC), it is suggested that, unlike natural soils and fish bones, there are not only single adsorption mechanisms but also adsorption mechanisms based on chemical adsorption and surface charge. In the case of fish bones, due to the relatively higher adsorption capacity than modified clays and its characteristic of significant desorption, it is expected more suitable for the removal of radionuclides in aquatic environments than for the immobilization of radionuclides in soil.

A Study on Client's Decision-Making in Construction Phase of Building Projects in Japan

  • Tamura, Atsushi;Kaneta, Takashi;Furusaka, Shuzo
    • International conference on construction engineering and project management
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    • 2017.10a
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    • pp.183-191
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    • 2017
  • In building project, client needs to decide many things, and clients cooperate with architects, supervisors, general contractors and other consultants. Especially in construction phase, clients often make a decision. However, client's decision-making in construction phase often makes some kinds of risk. This paper aims to clarify the reality of client's decision-making in construction phase. First, client's decision-making is defined by laws and standards. Second, the questionnaire revealed the current status of client's decision-making in 4 works. Third, Fishbone diagram shows the factors of client's decision-making in four works. Finally, it was modeled how client's decision-making in construction phase affects the post-process of 4 works.

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