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Ball Grid Array 보드 어셈블리의 동적굽힘 신뢰성에 미치는 언더필의 영향
장재원,방정환,유세훈,김목순,김준기,Jang, Jae-Won,Bang, Jung-Hwan,Yoo, Se-Hoon,Kim, Mok-Soon,Kim, Jun-Ki 한국재료학회 2011 한국재료학회지 Vol.21 No.12
In this paper, the effects of conventional and newly developed elastomer modified underfill materials on the mechanical shock reliability of BGA board assembly were studied for application in mobile electronics. The mechanical shock reliability was evaluated through a three point dynamic bending test proposed by Motorola. The thermal properties of the underfills were measured by a DSC machine. Through the DSC results, the curing condition of the underfills was selected. Two types of underfills showed similar curing behavior. During the dynamic bending reliability test, the strain of the PCB was step increased from 0.2% to 1.5% until the failure circuit was detected at a 50 kHz sampling rate. The dynamic bending reliability of BGA board assembly using elastomer modified underfill was found to be superior to that of conventional underfill. From mechanical and microstructure analyses, the disturbance of crack propagation by the presence of submicron elastomer particles was considered to be mainly responsible for that result rather than the shear strength or elastic modulus of underfill joint.
장재원,노지애,김현중,홍정수,배영춘,김동진,Jang, Jae-won,Roh, Ji-ae,Kim, Hyun-joong,Hong, Jung-soo,Bae, Young-chun,Kim, Dong-jin 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.2
Objectives: The purpose of this clinical case report is to describe the efficacy of Korean medicine in the treatment of vasovagal syncope. Methods: The patient was treated with acupuncture, pharmacopuncture, and herbal medicine. The symptoms (headache, palpitation, sweating, flushing, weakness, coldness) of the patient were observed. Results: After the treatment, the patient's symptoms improved, but more treatments were required. Conclusion: This study can add to understanding of the effect of Korean medicine on vasovagal syncope.
Sn-Ag-Cu-In-(Mn, Pd) 무연솔더의 솔더링성과 BGA 접합부 신뢰성
장재원,유아미,이종현,이창우,김준기,Jang, Jae-Won,Yu, A-Mi,Lee, Jong-Hyun,Lee, Chang-Woo,Kim, Jun-Ki 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.3
Sn-3.0Ag-0.5Cu 무연솔더에서 Ag 함량의 감소는 기계적 충격 신뢰성 향상에 도움이 되는 반면 솔더링성을 저하시키는 것으로 알려져 있다. 본 연구에서는 저 Ag함유 무연솔더의 솔더링성 향상을 위해 In을 첨가한 Sn-1.2Ag-0.7Cu-0.4In 4원계 조성과 여기에 미량의 Mn 및 Pd을 첨가한 무연솔더 조성에 대하여 솔더 젖음성을 평가하고, 보드 레벨 BGA 패키지의 열싸이클링 및 기계적 충격 신뢰성을 평가하였다. Sn-1.2Ag-0.7Cu 조성에 0.4 wt% In을 첨가한 합금의 젖음성은 Sn-3.0Ag-0.5Cu에 근접한 수준으로 향상되었으나, 패키지의 열싸이클링 신뢰성은 Sn-3.0Ag-0.5Cu에 미치지 못하는 것으로 나타났다. Sn-1.2Ag-0.7Cu-0.4In 조성에 0.03 wt% Pd의 첨가는 솔더 젖음성 및 패키지 신뢰성을 저하시킨 반면에 0.1 wt% Mn을 첨가한 합금은 특히 기계적 충격 신뢰성이 Sn-3.0Ag-0.5Cu는 물론 Sn-1.0Ag-0.5Cu보다도 우수한 수준으로 향상되었는데, 이는 Mn 첨가가 합금의 모듈러스를 감소시킨 데에 기인하는 것으로 생각된다. Although the lowering of Ag content in Sn-3.0Ag-0.5Cu is known to improve the mechanical shock reliability of the solder joint, it is also known to be detrimental to the solderbility. In this study, the quaternary alloying effect of In and the minor alloying effects of Mn and Pd on the solderability, thermal cycling and mechanical shock reliabilities of the low Ag content Sn-1.2Ag-0.7Cu solder were investigated using board-level BGA packages. The solderability of Sn-1.2Ag-0.7Cu-0.4In was proved to be comparable to that of Sn-3.0Ag-0.5Cu but its thermal cycling reliability was inferior to that of Sn-3.0Ag-0.5Cu. While the 0.03 wt% Pd addition to the Sn-1.2Ag-0.7Cu-0.4In decreased the solderability and reliabilities of solder joint, the 0.1 wt% Mn addition was proved to be beneficial especially for the mechanical shock reliability compared to those of Sn-3.0Ag-0.5Cu and Sn-1.0Ag-0.5Cu compositions. It was considered to be due that the Mn addition decreased the Young's modulus of low Ag content Pb-free solders.
영아기에 연속적인 세균성 뇌수막염으로 발현한 선천성 피부동 증례 1례
장재원(Jae Won Jang),김상엽(Sang Yeob Kim),김혜숙(Hae Sook Kim),이은주(Eun Joo Lee),이상길(Sang Geel Lee) 대한소아신경학회 2006 대한소아신경학회지 Vol.14 No.1
본 저자들은 신생아시기부터 반복적인 화농성뇌수막염을 앓은 소아에서 천추부 함몰과 피부착색으로 의심되어 시행한 자기공명영상 상 신경조직과 교통이 있는 선천성 피부동 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Acute bacterial meningitis is an uncommon, potentially life-threatening infection and recurrent episodes of bacterial meningitis are rarely seen. But when they occur, an exhaustive search for the mechanisms underlying the recurrent episodes must be pursued, especially some possible routes of migration of bacteria to the cerebrospinal fluid. Dermal sinus tracts are common skin manifestations seen with spinal dysraphism and may be associated with recurrent meningitis. Here, we present a case of a 2-month-old girl who had a small dimple on the lower lumbosacral area. She was attacked twice by purulent bacterial meningitis due to a dermal sinus tract and a tethered cord. She was treated with the excision of the tract, the removal of the dermoid and the detethering of the cord. Staphylococcus and Klebsiella were cultured separately and assumed to be causative agents. The lesion was suspected on the physical examination and demonstrated by lumbosacral magnetic resonance imaging.
무전해도금법을 이용한 도금조건에 따른 Ni/YSZ core-shell 분말 형상
장재원 ( Jae Won Jang ),김진호 ( Jin Ho Kim ),황종희 ( Jong Hee Hwang ),임태영 ( Tae Young Lim ),이종흔 ( Jong Heun Lee ),이미재 ( Mi Jai Lee ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.5
In this study, Ni-YSZ anode catalysts with a core-shell structure were synthesized by an elec-troless nickel plating method for solid oxide fuel cells (SOFCs). We investigated the microstructure and composition of the Ni-YSZ powder that were synthesized according to the plating conditions, which were the pretreatment cycles, temperature and time. The surface of the synthesized Ni-YSZ powders was homogenously plated with Ni particles and the powders had a core-shell structure. The catalyst nuclei of Sn and Pd were uniformly distributed on the surface of YSZ powders fabricated by the pretreatment of three cycles. As the plating time and temperature increased, the nickel particles increased and the plating layer was dense. However, when the plating temperature was over 90℃, the decomposition of the solution occurred. Therefore, the plating conditions were adjusted to control the shape of the Ni-YSZ core-shell powder. Finally, the Ni-YSZ particles with a size of 0.5 μm and a core-shell structure were fabricated at 80℃ for 10 minutes.
단일공 다빈치로봇을 이용하여 헤어라인 절개를 통한 일차성 부갑상선 증대증 수술 1예
장재원(Jae Won Jang),한명월(Myung Woul Han) 대한신경모니터링학회 2023 Journal of Neuromonitoring & Neurophysiology Vol.3 No.2
The da Vinci single port(SP) robotic system features a single arm design that may be particularly suitable for procedures requiring long and narrow working spaces, such as thyroidectomy. Recent advances in preoperative localization studies and the increasing demand for scarless surgery have spurred research into remote surgical techniques for parathyroid surgery. The hairline approach appears to offer the most convenient and safest access to the neck. In this paper, we share our preliminary experience with SP robotic parathyroidectomy, employing only a hairline incision, in one patient with primary hyperparathyroidism. The operation lasted 35 minutes and the console time was 15 minutes. There were no postoperative complications. The SP robot parathyroidectomy using a hairline incision is a viable and safe, providing improved surgical exposure and instrument manipulation.