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

적응적 배타적 논리합을 이용한 깊이정보 맵 코딩 방법

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

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.

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.

고인골 유전자 증폭 효율이 높은 PCR 반응 조건

김경용(Kyung-Yong Kim),우지영(Ji-Young Woo),김기정(Kijeong Kim) 대한체질인류학회 2008 해부·생물인류학 (Anat Biol Anthropol) Vol.21 No.2

고인골의 시료 및 핵산의 양적 제한 때문에 표적핵산의 PCR 증폭이 고인골 핵산 분석에 필수적으로 요구되는 전제 조건이다. 현대인의 신선한 핵산과는 달리, 사후 보존에 불리한 환경 속에 오랜 시간 동안 방치되어 온 고인골 시료로부터의 PCR 증폭은 성공적이지 못한 경우가 흔하다. 따라서 고인골 DNA에 적합한 PCR 증폭방법의 시행이 요구된다. 그러나 고대 시료에 적합한 향상된 PCR 증폭 기법에 대한 체계적인 연구가 시행된 보고가 없다. 이 연구에서는 한국과 몽골의 약 500년에서 3300년 된 PCR 증폭이 어려운 8개 고인골 검체들로부터 광범위한 PCR 조건들을 체계적으로 시도하고 PCR 증폭의 성공율을 비교하였다. PCR 조건들의 증폭율을 비교하기 위한 표적 핵산으로서는 카피수가 많은 사립체 핵산과 세포내 단일 카피 DNA로서 현대 한국인에서 흔한 Y 염색체 일배체 그룹으로 알려진 O 일배체 그룹 표지(M175) 핵산을 이용하였고, 성공적인 증폭산물의 형성의 검증은 증폭산물들의 염기서열을 분석을 통하여 시행하였다. 이 연구를 통하여 고인골에서 핵산을 증폭하기 위한 최적의 PCR 조건을 확립하였고, 결정된 방법은 검사한 모든 샘플에서 사립체 핵산을 성공적으로 증폭시켰고, M175 Y 염색체 일배체 표지 핵산의 증폭은 검사된 시료수의 50% 성공율을 나타냈지만 시도된 조건들에서 가장 높은 성공율을 나타내었다. 이 결과는 성공적인 고인골 핵산분석을 위한 최적의 PCR 조건으로 분자 유전학적 인류학 연구에 유용하게 쓰일 수 있음을 시사한다. The ancient bone DNA analysis essentially requires PCR amplification of the targeting genes of study due to the limitation of the ancient bone sample and DNA amounts. In contrast to the fresh living human DNA, it is common to face failing in amplifying the poorly preserved ancient DNA after death. Therefore, the optimized PCR methods appropriate for ancient DNA are required. However, there is no report to date that a systemic investigation of enhanced PCR amplification methods suitable for ancient samples has been conducted. Approximately 500~3,300-year-old Korean and Mongolian ancient bones that are resistant to PCR were selected and an extensive number of PCR conditions were systematically investigated for the comparison of PCR success rates. For the PCR analysis, a mitochondrial DNA fragment as a multicopy DNA and a M175 Y chromosome biallelic marker DNA fragment as a single copy DNA that is the marker of the prevalent Y haplogroup (haplogroup O) in Korea were targeted. The identity of the amplified products were confirmed by DNA sequencing. Through this study, we established the optimized PCR conditions for the highly successful amplification of ancient bone DNAs. This estabilished method allowed for the successful amplification of mitochondrial DNAs from all the ancient bone samples tested and the amplification by 50% success rates in the amplification of M175 Y chromosome biallelic marker DNA but with the highest success rates. These results demonstrate that the optimized PCR condition will be useful for the promising ancient DNA analysis in the fields of molecular genetic anthropological studies.

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.