수축율 조절에 의한 적층 칩 LC Filter의 동시 소성에 관한 연구

김경용,이종규,김왕섭,최환,Kim, Kyung-Yong,Lee, Jong-Kyu,Kim, Wang-Sup,Choi, Hwan 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.9

Among many problems that need to be solved in the process of preparing multilayer chip LC filters, we studied the control of shrinkage in order to prevent the crack, warpage, and/or delamination which occurs at the interface between the inductance (L part) and the capacitance (C part). Shrinkage was controlled by compositions, powder size, calcining temperature and amount of organic binder. Capacitance sheet was prepared by mixing 65 wt% binder with the composition of 96 wt% TiO2 having an average particle size of 0.5 $\mu\textrm{m}$, 3 wt% CuO. After small amount of MnO2 and SiO2 added, it was calcined at 750$^{\circ}C$ for 2 hr. Inductance sheet was prepared by mixing 60 wt% binder with the composition of 49.5% mol% Fe2O3, 20.5 mol% ZnO, 20 mol% NiO and 10 mol% CuO which was calcined at 775$^{\circ}C$ for 2 hr. These sheets was laminated at 250 kg/$\textrm{cm}^2$, and cofired at 900$^{\circ}C$ for 2 hr to give rise to a multilayer chip LC filter without any warpage.

유전체 원주공진기법에 의한 고주파 유전특성 측정에 관한 연구

김경용,김왕섭,최환,Kim, Kyung-Yong,Kim, Wang-Sup,Choi, Hwan 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.3

Measurement factors for the dielectric properties of low dielectric loss materials (tan${\dalta}{\le}10^{-4}$) were investigated using the dielectric rod resonator method. It was shown that the relative conductivity (${\sigma}_{r}$) should be controlled within a 5% to obtain the standard deviations of less than 0.07 for permittivity .epsilon.r and 0.06${\times}10^{-4}$ for tan.delta.respectively. Surface resistivity (R$_s$) could be reduced when the surface roughness of parallelled conducting plate was less than 0.07 .mu.m. Measurement error for the permittivity was $\pm$0.02% independent of probe loop size, whereas the error in Q value was reduced with the decrease in probe loop size and also with the increase in the absolute values of Q. Reliable Q values were determined with the probe loop size of less than 4mm. The accurate for the distance between the measuring probe loop and the sample could be obtained when the insertion loss of resonant frequency ranged -15dB - -30dB.

소프트웨어 안전 공학 프로세스 관한 연구

김경용(Kyung-Yong Kim) 대한전기학회 2014 정보 및 제어 심포지엄 논문집 Vol.2014 No.10

현장 내공변위계측 시계열 자료기반 근접터널의 순응적 시공안정성 분석

김경용(Kyung-Yong Kim),조국환(Kook-Hwan Cho),손석철(Seok-Chul Son) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.5

최근 도심지 철도터널은 공용중인 터널에 인접하여 터널이 시공 되어지고 있다. 기존 공용터널에 근접하여 시공터널을 시공하기 위해서는 운행중인 공용터널의 구조적 안정성을 확보하고 시공터널을 시공하여야 한다. 설계에서는 설계기준을 준용하여 설계하지만 실제 현장조건과 지반조건이 장소마다 큰 차이를 나타낸다. 시공단계 해석 결과도 현장조건과 불일치하고 일률적인 추정 공학 상수를 이용하므로 신뢰성이 매우 낮다. 이에 대한 해결방안은 현장계측과 적절한 시공관리시스템이다. 본 연구에서는 시공터널을 굴착하면서 인접한 공용터널의 안정성을 목표로 현장계측 시계열분석 결과를 다음 시공단계에 적용하는 순응적 순환관리체계를 시도하였다. 먼저 공용터널 직하부의 시공터널을 굴착하기전에 수치해석을 수행하였다. 수치해석 결과를 이용하여 공용터널 취약부위에 내공변위계를 설치하였다. 현장계측 결과 최대 0.028mm 발생하였다. 시공터널 굴착에 따른 공용터널의 시계열 현장계측자료를 이용하여 공용터널 내공변위 추세를 예측하였다. 예측기법으로는 시계열분석기법 중 하나인 진보된 ARIMA모델을 이용하였다. ARIMA모델을 이용한 단기 추세예측 결과는 현장계측과 오차가 최대 0.002mm 발생하였다. 이는 95% 신뢰한계값 이내이므로 매우 적합하게 예측되었다. Recently, railway tunnels in urban areas have been built as proximity tunnels adjacent to operating tunnels. The structural stability of the operating tunnel must be secured, and the construction tunnel must be constructed before constructing a tunnel close to an existing operating tunnel. While designs adhere to design standards, the actual site and ground conditions exhibit significant variations across locations. The reliability of the construction stage analysis is very low because it is inconsistent with the field conditions, and a uniform estimated engineering constant is used. The solution to this is on-site measurement and an appropriate construction management system. In this study, an adaptive cycle management system was attempted to apply the results of time series analysis of field measurements to the next construction stage to ensure the stability of adjacent operating tunnels while excavating a construction tunnel. First, numerical analysis was performed before excavating the construction tunnel directly under the operating tunnel. Using numerical analysis results, a convergence meter was installed in the vulnerable area of the operating tunnel. Field measurements indicated a maximum displacement of 0.028 mm. The trend of convergence in the operating tunnel was predicted using the time series field measurement data of the operating tunnel according to the construction tunnel excavation. The advanced ARIMA model, one of the time series analysis techniques, was used as a prediction technique. The short-term trend prediction result using the ARIMA model revealed a maximum error of 0.002 mm from field measurements. This was predicted to be very suitable because it was within the 95% confidence threshold.

전투준비태세 및 유사장비 운용자료를 활용한 RAM 목표 값 설정방법에 관한 연구

김경용(Kyung Yong Kim),배석주(Suk Joo Bae) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.3

RAM(Reliability, Availability, Maintainability) is important performance factor to keep combat readiness and optimize operational and maintenance cost of weapon systems. This paper discusses the method to establish RAM for combat readiness by using field failure data from similarity equipments. Operational availability is estimated from a binomial distribution function of user's operational conditions such as combat readiness preservation probability, operational rate, operational availability and total number of equipment. Reliability and maintainability is estimated from field failure data from similarity equipment to accomplish operational availability. The effectiveness of established RAM is verified through analysis of combat readiness preservation probability and mission reliability. A case study of weapon system illustrates the process of the proposed method.

Neer 제II형 원위 쇄골 골절에서 갈고리형 금속판 고정술 후 발생한 금속판 주위 골절 -3예 보고-

김경용 ( Kyung Yong Kim ),김준엽 ( Joon Yub Kim ),이원복 ( Won Bok Lee ),정명곤 ( Myong Gon Jung ),유정현 ( Jeong Hyun Yoo ),김주학 ( Joo Hak Kim ) 대한골절학회 2016 대한골절학회지 Vol.29 No.1

전위된 원위 쇄골 골절에서 갈고리형 금속판을 이용한 정복 및 고정술은 골절의 유합 및 기능적 측면에서 만족할만한 결과를 나타내는 것으로 알려져 있다. 그러나 갈고리형 금속판과 관련된 잘 알려진 합병증으로 충돌증후군, 견봉의 미란 및 골절 등이알려져 있으며, 금속판 주변부 골절도 드물게 발생한다. 저자들은 Neer 제II형의 원위 쇄골 골절의 갈고리형 금속판 고정술후, 3예의 금속판 주변부 골절의 발생을 경험하였다. 전체 예에서 금속판 내측단의 나사못 삽입부에서 기시된 골절을 확인하였으며, 이의 원인으로 6홀 이상의 갈고리형 금속판의 내측단 나사못이 전방 또는 후방 피질골 면에 가깝게 삽입되는 문제와 쇄골외측 말단부의 과도한 정복 또는 하방 정복으로 인한 내측단 나사못 부위의 스트레스 증가인 것으로 판단되어 이에 대해 기술하고자 하였다. Hook plate fixation is a treatment method for the displaced distal clavicle fracture with favorable results regarding bone union and shoulder function, however possible complications include impingement syndromes, subacrormial erosions, acromial fractures, and periprosthetic fractures. In this report, we observed 3 cases of periprosthetic fracture after hook plate fixation. All cases of periprosthetic fractures were initiated at the medial end screw holes. The causes of these periprosthetic fractures appeared to be the off centered fixation of medial end screws near the anterior or posterior cortex which were specific during operations with hook plates with more than 6 holes and the increased stress on the medial end screw by over-reduced or inferiorly reduced position of the distal end of the clavicle by the hook plate.

켑스트럼을 이용한 다중 응답신호의 소음원 해석기법

金敬容(Kyung-Yong Kim),李章明(Jang-Myung Lee) 大韓電子工學會 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.6

선박의 수중방사소음을 최소화하기 위해서는 주요 소음원인 탑재장비, 추진계통 및 구조물의 전달과정 등에 의해 발생되는 각각의 소음특성 규명이 이루어져야 한다. 그러나 선박의 운항시 계측된 신호는 다중의 소음원과 많은 전달경로에 의해 신호가 중첩되어 발생되고, 소음원과 전달함수를 계측할 수 없는 경우가 많다. 이 논문애서는 켑스트럼 신호처리를 이용한 계측된 응답신호로부터 각각의 소음원과 전달함수 특성을 분리 추출할 수 있는 시험분석기법을 제시하고, 제시된 기법을 수치계산 및 가진실험에 적용하여 검증하고, 실제 선박에 적용하여 유용함을 보인다. To reduce the radiated noise of ships, the noises which are generated from onboard machinery, propulsion system and transfer characteristics of structure must be identified. While the ship is operating, however, we can not directly measure each signal of inputs and characteristics of transfer passage, because measured signals are superimposed by multi-source and multi-transfer passage. In this paper, the signal processing method for separating noise sources and transfer functions from the measured response signal by the cepstrum technique is proposed. The proposed method is verified by application of simulated signal and impact test and shows usefulness by application of real shin test.

뇌졸중 환자에게 선택적 과제지향 훈련이 상지기능과 일상생활활동에 미치는 영향

김경용(Kim Kyung Yong),이주상(Lee Ju-Sang),박준형(Park Jun-Hyung) 대한치료과학회 2015 대한치료과학회지 Vol.7 No.2

Objective: Study is to examine the effects of selective task-oriented training of stroke patients on upper extremity functions and daily living activities. Method: The present study assigned 34 stroke patients to an experimental group or a control group and examined the effects of selective task-oriented training in the experimental group and biofeedback system training in the control group on the upper extremity function and daily living activities of the patients. The exercises were performed for 30 minutes per day, 5 days per week for 8 weeks. The homogeneity of the general characteristics and dependent variables of the two groups was evaluated by conducting Chi-squ are tests and independent t-tests. Repeated-measure ANOVA was conducted to measure changes in the experimental and control groups, and ANOVA was conducted to compare differences in changes before, during, and after the study between the two groups. Results: Selective task-oriented training brought about significant improvement in upper extremity functions and daily living activities compared to biofeedback system training(p<.05). Selective task-oriented training resulted in more significant improvement in BBT, MFT, and FMA, which are assessments of upper extremity function, and in K-MBI, which is an assessment of daily living activities (p<.05), while biofeedback system training resulted in more significant improvements in grip strength (p<.05). Conclusion: Selective task-oriented training is expected to become an effective treatment approach for these patients.

도시철도에서 복합지층 굴진시 토압식 쉴드TBM 공법의 커터교환 주기 산정에 관한 연구

김경용(Kim, Kyung Yong),사공명(Myung Sagong),조국환(Kook-Hwan Cho) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

쉴드TBM 공법은 소음 및 진동 발생이 없어 민원발생이 적으며, 교통 흐름에도 지장을 주지 않아 복잡한 도심지 공사에 적합하여 각광받고 있는 터널 공법이다. 이 공법은 단일 지층 굴진 시 굴진 효율이 가장 우수하며 디스크 커터 교환주기도 일정해진다. 하지만 국내 지반은 대다수 복합 지층으로 이루어져 디스크 커터 편마모 발생의 원인이 되며, 커터 교환주기도 불규칙해진다. 본 연구에서는 선행연구 분석 및 전문가 설문을 통해 커터교환의 영향인자를 도출하였고, 쉴드TBM 굴진데이터를 분석하여 영향인자들의 변화패턴 및 주기를 파악하였다. 본 연구에서 도출된 커터 교환 영향인자들의 변화 패턴 및 주기는 향후 쉴드TBM 커터 교환주기 산정 및 굴진관리의 기본 토대가 될 것으로 사료된다. Shield TBM Method is a tunneling method fit for downtown constructions and highly favored by construction companies because it does not cause noise or vibration, further leading to less civil complaints, and even disrupt traffic flow. When adopted to dig through a single ground layer, This method shows the highest tunnel advance efficiency and has a regular disk cutter replacement cycle. As strata in Korea are composed of multiple-ground layers, however, it causes uneven wear of the disk cutter and the replacement cycle of cutters becomes irregular. Thus, this study drew impact factors for the replacement of cutters by analyzing previous researches and conducting a survey with experts, and by analyzing the Shield TMB tunneling data, this study attempted to comprehend the change patterns and cycles of impact factors. It is expected that the change patterns and cycles of impact factors for the replacement of cutters will be used as basic data in calculating a shield TMB cutter replacement cycle and managing tunneling constructions.

적응적 배타적 논리합을 이용한 깊이정보 맵 코딩 방법

김경용(Kyung Yong Kim),박광훈(Gwang Hoon Park) 한국방송·미디어공학회 2011 방송공학회논문지 Vol.16 No.2

This paper proposes an efficient coding method of the depth-map which is different from the natural images. The depth-map are so smooth in both inner parts of the objects and background, but it has sharp edges on the object-boundaries like a cliff. In addition, when a depth-map block is decomposed into bit planes, the characteristic of perfect matching or inverted matching between bit planes often occurs on the object-boundaries. Therefore, the proposed depth-map coding scheme is designed to have the bit-plane unit coding method using the adaptive XOR method for efficiently coding the depth-map images on the object-boundary areas, as well as the conventional DCT-based coding scheme (for example, H.264/AVC) for efficiently coding the inside area images of the objects or the background depth-map images. The experimental results show that the proposed algorithm improves the average bit-rate savings as 11.8 % ~ 20.8% and the average PSNR (Peak Signal-to-Noise Ratio) gains as 0.9 ㏈ ~ 1.5 ㏈ in comparison with the H.264/AVC coding scheme. And the proposed algorithm improves the average bit-rate savings as 7.7 % ~ 12.2 % and the average PSNR gains as 0.5 ㏈ ~ 0.8 ㏈ in comparison with the adaptive block-based depth-map coding scheme. It can be confirmed that the proposed method improves the subjective quality of synthesized image using the decoded depth-map in comparison with the H.264/AVC coding scheme. And the subjective quality of the proposed method was similar to the subjective quality of the adaptive block-based depth-map coding scheme.