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김종혁,배재성,황재혁,Kim, Jong-Hyuk,Bae, Jae-Sung,Hwang, Jai-Hyuk 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
Due to the improvement of science technology, the future tank system will have the multi-function for more powerful firing. and the tank, mounted this multi-function, must be lighter to maintain the mobility. Therefore, new brecoil technology would be necessary to reduce the recoil force for lighter platform. The present study covers a FOOB(Fire-Out0-Of-Battery) system that can reduce the recoil force dramatically. The firing sequence of the FOOB system is radically different from that of a conventional system. The gun is latched in out-of-battery position prior to firing. As soon as firing is occurred, the gun is unlatched and accelerated. The forward momentum is imparted to the recoiling parts. This momentum is opposed by the ballistic force imparted by firing and the recoil force and recoil length will be reduced. In this study, the ADAMS simulation has been performed with the scale model of the FIB(Fire-In-Battery) system and the FOOB system. The ADAMS simulation results show that the FOOB system could reduce the operating time and recoil length and the recoil force.
TE<sub>01</sub><sub>δ</sub> 모드 유전체 공진기와 코플래나 웨이브가이드 구조들과의 결합 특성 연구
김종혁,김인석,Kim, Jong-Hyuk,Kim, Ihn S. 한국항행학회 2005 韓國航行學會論文誌 Vol.9 No.2
본 논문에서는 기존 코플래나 웨이브가이드(CPW), 유한접지(FG) CPW, 그리고 접지(G) CPW와 같은 세 종류의 균일단면 구조의 CPW와 $TE_{01{\delta}}$ 모드 유전체공진기(DR : Dielectric Resonator)간의 결합 특성을 연구하고 마이크로스트립과 DR과의 결합과 같은 병렬 공진 특성을 보이는 CPW 와 DR간의 결합회로의 설계 방법을 제안한다. 결합 특성은 DR을 CPW의 접지와 신호선사이의 두 간격 중의 하나의 중심 상에 유전체 지지대(Support)를 이용하여 위치시키고 접지 방향으로 이동하면서 연구되었다. HFSS(High Frequency Structure Simulator : Finite Element Method Commercial Tool)의 시뮬레이션과 측정된 S-파라미터 값은 잘 일치했다. 마지막으로, 위에서 언급한 세 종류의 CPW와 DR과의 결합과 마이크로스트립라인과 DR과의 결합을 무부하 품질계수인 $Q_u$를 이용하여 비교하였다. 비교결과 CPW와 DR과의 결합은 마이크로스트립라인과 DR과의 결합보다 높은 $Q_u$ 값을 나타냈고 그 중에서 GCPW와 DR과의 결합이 가장 높은 $Q_u$를 보여줬다. In this paper, we propose that three uniform coplanar waveguides(CPWs), such as a conventional, finite grounded(FG), and grounded(G) CPWs, can be coupled with a $TE_{01{\delta}}$ mode dielectric resonator(DR) for a parallel resonant characteristic as a microstrip line coupled with the DR. Coupling characteristics have been investigated by placing the DR on a dielectric support above the CPWs and by moving the DR away from the center of a slot of the CPWs to the ground plane. FEM simulation(HFSS) results in terms of S-parameters agree well with measurement results. Finally, unloaded Q values of the DR coupled with the three uniform CPWs are compared with those of the DR coupled with a microstrip line. The comparison shows that the DR coupled with the three CPWs has higher unloaded Qs than that coupled with a microstrip line and that the GCPW case has the highest unloaded Qs.
김종혁(Kim, Jong-Hyuk),김의수(Kim, Eui-Soo),서영일(Seo, Young-Il),문병선(Moon, Byung-Sun),고재모(Goh, Jae-mo),박남규(Park, Nam-Kyu) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Forensic Engineering is the area covering the investigation of products, structures that fail to perform or do not function as intended, causing personal injury or damage to property. To investigate the mobile crane’s overturn accident in terms of the forensic engineering, in this study, we identified the accident mobile crane’s position and posture before accident by the analysis of the trace resulted by the contact between the outrigger and the ground, and the accident remodeling has been performed in the basis of the accident mobile crane’s position and posture information. The accident analysis has been performed by comparing this accident remodeling and the crane’s specification, the table of the allowance load about the boom’s length and the working radius. Through these studies, the safety accident that may occur in mobile crane can be minimized by performing specialized and systematic investigation of the accident cause in terms of the forensic engineering.
옥수수의 생육 및 수량 증대를 위한 지중점적 관비 시스템의 적용
김종혁(Jong Hyuk Kim),이연주(Yeon Ju Lee),노일래(Il Rae Rho) 한국작물학회 2023 한국작물학회지 Vol.68 No.3
본 연구는 지중점적시설을 이용한 옥수수 관수·관비재배시 옥수수의 생육 및 수량 반응을 조사하여 적합한 관수및 관비기준을 마련하고자 수행되었다. 1) 사양토 조건에서 지중점적시설을 이용한 관비 재배시옥수수 근권부까지 필요한 수분은 24.3 ton 10a-1의 물이 소모되었다. 2) 사양토(점토함량 10.2%) 조건에서 한번 관수·관비로 토양수분함량이 25%정도 유지될 수 있는 기간은 25일, 20% 정도까지는 30일간 지속되었다. 3) 지중점적 관수·관비처리에 따른 옥수수 지상부 생육은N 8 처리구에서 가장 우수하였으며 N 10 처리구에서는감소하는 경향이 나타났다. 4) 지중점적 관수·관비처리에 따른 옥수수 수량구성요소는 N 8 처리구가 가장 우수하였으며 관수구 대비 약 14%, 무처리 대비 약 30%의 증수 효과를 나타내었다. This study was conducted to investigate how maize (Zea maize L.) growth and yield were affected by irrigation and fertigation using a subsurface drip system. The system consisted of a buried (40 cm underground) drip pipe that can be used in a semi-permanent manner without affecting agricultural work on the ground. The amount of water required for the fertigation treatment was determined to be 24.3 tons 10a-1 for the sandy loam soil used in this experimental field. Fertigation treatments based on the previously calculated 24.3 tons 10a-1 were carried out as topdressing applications. They were applied through the subsurface drip system with the following fertilizer concentration (nitrogen only, written in kg 10a-1: N 4, N 6, N 8, N 10 ). The other treatments were irrigation only and control (non-treatment). The results indicated that the N 8 treatment was the most effective, increasing yield by 30% and 14% compared with the control and irrigation treatments, respectively. These results highlight the effectiveness of fertigation (N 8 kg 10a-1) at V6 and R1 stage as a form of topdressing fertilization using a subsurface drip system for achieving a high yield and stable maize production.
무전해 도금법에 의해 제조된 은 피복 Ni - Zn Ferrite Sphere의 전파흡수특성
김종혁(Jong-Hyuk Kim),김재웅(Jae-Woong Kim),김성수(Sung-Soo Kim) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.3
The present investigation provides an electromagnetic radiation absorptive composition which comprises silver-coated ferrite microspheres dispersed in silicon rubber matrix for the aim of thin microwave absorber in GHz frequencies. Ni-Zn ferrite spheres with 50 ㎛ size in average were prepared by spray-drying and sintering at 1130oC. Conductive silver layer was plated on ferrite spheres by electroless plating. Conductive Ni-Zn ferrite sphere with uniform silver layer were obtained in the concentration of 10 g/L AgNO₃ per 20 g ferrite spheres. For this powder, electrical resistance is reduced as low as 10-²~10-³ Ω. The most sensitive material parameters with silver plating is real and imaginary parts of complex permittivity. The conductive Ni-Zn ferrite spheres have large values of dielectric constant. Due to this high dielectric constant of microspheres, matching thickness is reduced to as low as 2 ㎜ at the frequency of 7 ㎓, which is much thinner than conventional ferrite absorbers.
차량크레인 전도 사고의 구조 안정성 평가에 관한 법공학적 연구
김종혁 ( Jong Hyuk Kim ),김의수 ( Eui Soo Kim ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3
Forensic Engineering is the area covering the investigation of products, structures that fail to perform or do not function as intended, causing personal injury or damage to property. To investigate the mobile crane′s overturn accident in terms of the forensic engi-neering, in this study, we identified the accident mobile crane′s position and posture before accident by the analysis of the trace resulted by the contact between the outrigger and the ground, and the accident remodeling has been performed using CATIA modeling program in the basis of the accident mobile crane′s position and posture information. The accident analysis has been performed by comparing this accident remodeling and the crane′s specification, the table of the allowance load about the boom′s length and the working radius. Through these studies, the safety accident that may occur in mobile crane can be minimized by performing specialized and systematic investigation of the accident cause in terms of the forensic engineering.