• ETRI Journal
• /
• 제36권1호
• /
• pp.106-115
• /
• 2014

In this work, the coplanar waveguide is fabricated on a PES (poly[ether sulfone]) substrate for application to a flexible monolithic microwave integrated circuit, and its RF characteristics were thoroughly investigated. The quality factor of the coplanar waveguide on PES is 40.3 at a resonance frequency of 46.7 GHz. A fishbone-type transmission line (FTTL) structure is also fabricated on the PES substrate, and its RF characteristics are investigated. The wavelength of the FTTL on PES is 5.11 mm at 20 GHz, which is 55% of the conventional coplanar waveguide on PES. Using the FTTL, an impedance transformer is fabricated on PES. The size of the impedance transformer is $0.318mm{\times}0.318mm$, which is 69.2% of the size of the transformer fabricated by the conventional coplanar waveguide on PES. The impedance transformer showed return loss values better than -12.9 dB from 5 GHz to 50 GHz and an insertion loss better than -1.13 dB in the same frequency range.

• 한국재난관리표준학회지
• /
• 제1권4호
• /
• pp.33-40
• /
• 2008

본 연구에서는 최근 사회적 이슈로 등장하고, 빈번하게 대형 사고가 발생하는 개인정보 보안 사고에 대하여 사전에 탐지하여 예방할 수 있는 개인정보보호를 위한 리스크 모니터링 모델을 제시한다. 이를 위하여 개인정보 및 개인정보보호 업무를 정의하고, 개인정보 생명주기에 따른 리스크를 식별한다. 식별된 리스크는 전문가 설문을 통하여 우선관리대상 리스크를 선정하고, Fishbone Diagram을 활용하여 리스크 요인을 도출한다. 리스크 요인들은 지표로서 각 측정 단위와 임계치를 보유하며, 개인정보보호 업무와 리스크에 따라 지표의 값을 가지고 판단하는 경고맵을 개발한다.

• 한국산학기술학회논문지
• /
• 제20권4호
• /
• pp.15-24
• /
• 2019

다목적훈련지원정(MTB)에 탑재되는 전자전훈련지원체계(EWT) 송신 신호에 의해 MOSCOS 간 전자기간섭 문제점을 해결하기 위한 안테나 최적 위치에 대한 연구를 수행하였다. 이를 위해 4M1E에 근거한 Fishbone Diagram을 이용하여 7가지의 원인을 식별하였으며 Friis 전달공식을 통해 고려해야 할 요소를 식별하고 기존 함정에서 발생한 유사 문제점을 분석한 후, 두 개의 최적 배치 후보를 선정하였다. 두 개의 설치 위치에 대해 전자기 수신 레벨을 측정하여 최적배치(안)을 수립한 후, 본 개선사항에 대한 실선 시험을 통해 전자기 간섭 개선 효과를 확인하였다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
• /
• pp.343-346
• /
• 2003

High Luminance PDPs have been developed using high efficient electrode structure, discharge gas and fishbone type barrier ribs. New phosphors for the good picture quality were developed. Also, New manufacturing processes such as CPBB were applied in order to reduce processing steps. High Luminance of 1,000 $cd/m^2$ was obtained in the series of 42 inch, 50 inch and 60 inch PDPs.

• 산업경영시스템학회지
• /
• 제40권3호
• /
• pp.27-37
• /
• 2017

As the global uncertainty of manufacturing has increased and the quality problem has become global, the recall has become a fatal risk that determines the durability of the company. In addition, as the convergence of PSS (product-service system) product becomes common due to the development of IT convergence technology, if the function of any part of hardware or software does not operate normally, there will be a problem in the entire function of PSS product. In order to manage the quality of such PSS products in a stable manner, a new approaches is needed to analyze and manage the hardware and software parts at the same time. However, the Fishbone diagram, FTA, and FMEA, which are widely used to interpret the current quality problem, are not suitable for analyzing the quality problem by considering the hardware and software at the same time. In this paper, a quality risk assessment model combining FTA and FMEA based on defect rate to be assessed daily on site to manage quality and fishbone diagram used in group activity to solve defective problem. The proposed FTA-FMEA based risk assessment model considers the system structure characteristics of the defect factors in terms of the relationship between hardware and software, and further recognizes and manages them as risk. In order to evaluate the proposed model, we applied the functions of ITS (intelligent transportation system). It is expected that the proposed model will be more effective in assessing quality risks of PSS products because it evaluates the structural characteristics of products and causes of defects considering hardware and software together.

• Transactions on Electrical and Electronic Materials
• /
• 제16권3호
• /
• pp.142-145
• /
• 2015

In this work, open stubs were fabricated on a polyether sulfone (PES) substrate, and their basic radio frequency (RF) characteristics were investigated for application to RF matching components of a flexible monolithic microwave integrated circuit (MMIC). According to the results, an open stub employing coplanar waveguide (OSCPW) on PES exhibited much lower loss than that on silicon substrate. The OSCPW with a length of $500{\mu}m$ on PES showed capacitance values of 0.031 ~ 0.044 pF from 0.5 to 50 GHz. For application to a relatively high-value capacitive matching, an open stub employing a fishbone-type transmission line (OSFTTL) was fabricated on PES, and its characteristics were investigated. The OSFTTL showed much higher capacitance values than the OSCPW due to the high effective permittivity value. Specifically, the OSFTTL on PES showed capacitance values of 0.066 ~ 0.24 pF from 0.5 to 50 GHz, which are higher than those for the open stub on silicon substrate. The above results indicate that the OSCPW and OSFTTL on PES can be effectively used for application to low/high-value capacitive matching components on microwave and millimeter wave flexible MMIC. To the best of the authors' knowledge, this work is the first report of the investigation of RF capacitive matching components on PES substrate.

• 한국산학기술학회논문지
• /
• 제16권9호
• /
• pp.5914-5923
• /
• 2015

최근 들어 군수품에 대한 품질문제가 다양한 형태로 발생하면서, 품질보증업무를 수행하는 국방기술품질원의 위험관리기반 프레임웍에 대한 변화의 필요성이 제기되고 있다. 본 논문에서는 먼저 위험관리관련 수행된 기존 연구들을 검토한 후, 현재 국방기술품질원과 위험관리기반 체제를 채택하고 있는 국내 외 기관 두 곳의 업무규정을 비교 분석하여 문제점 식별 및 개선점을 도출 하였다. 본 연구에서 제안하는 새로운 위험관리 프레임웍은 PDCA 프레임웍을 기반으로 눈에 보이는 관리를 위해 Fishbone차트의 활용을 제안하였다. 또한 마인드맵 소프트웨어의 활용을 통해 군수품 위험관리 사례의 구현으로 실제업무의 적용가능성을 검토해 보았다.

• Earthquakes and Structures
• /
• 제24권5호
• /
• pp.353-364
• /
• 2023

In this study, a method has been proposed for the static and dynamic nonlinear analysis of multi-storey buildings, which takes into account the contribution of axial deformations in vertical load-bearing elements, which are especially important in tall and narrow structures. Shear deformations on the shear walls were also taken into account in the study. The presented method takes into account the effects that are not considered in the fishbone and flexural-shear beam models developed in the literature. In the Fishbone model, only frame systems are modeled. In the flexural shear beam model developed for shear wall systems, shear deformations and axial deformations in the walls are neglected. Unlike the literature, with the model proposed in this study, both shear deformations in the walls and axial deformations in the columns and walls are taken into account. In the proposed model, multi-storey building is represented as a sandwich beam consisting of Timoshenko beams pieced together with a double-hinged beam. At each storey, the total moment capacities of the frame beams and the coupled beams in the coupled shear walls are represented as the equivalent shear capacity. On the other hand, The sums of individual columns and walls moment at the relevant floor level are represented as equivalent moment capacity at that floor level. At the end of the study, examples were solved to show the suitability of the proposed method in this study. The SAP2000 program is employed in analyses. In a conclusion, it is observed that among the solved examples, the proposed sandwich beam model gives good results. As can be seen from these results, it is seen that the presented method, especially in terms of base shear force, gives very close results to the detailed finite element method.

• International Journal of Automotive Technology
• /
• 제6권6호
• /
• pp.625-633
• /
• 2005

Vehicle drift was reduced using statistical six sigma tools. The study was performed through four steps: M (measure), A (analyze), I (improve), and C (control). Step M measured the main factors which were derived from a fishbone diagram. The measurement system capabilities were analyzed and improved before measurement. Step A analyzed critical problems by examining the process capability and control chart derived from the measured values. Step I analyzed the influence of the main factors on vehicle drift using DOE (design of experiment) to derive the CTQ (critical to quality). The tire conicity and toe angle difference proved to be CTQ. This information enabled the manufacturing process related with the CTQ to be improved. The respective toe angle tolerance for the adjustment process was obtained using the Monte Carlo simulation. Step C verified and controlled the improved results through hypothesis testing and Monte Carlo simulation.

• 품질경영학회지
• /
• 제37권3호
• /
• pp.74-82
• /
• 2009

This article presents a six sigma project for improving purchase conversion rate in mobile game site. The project was carried out based on DMAIC process. First, a defect rate is defined as low purchase conversion rate. In addition, 60-days purchase data was analyzed and it is shown that the defects level was 2.48 sigma level. In this study, in order to raise the sigma level, six personalization services were used in the mobile game site. Six factors were determined based on FDPM(Functional Deployment Process Map), fishbone chart, linear regression analysis, effort-performance matrix, and so on. The sigma level of defects has improved from 2.48 to 2.93.