Experiences of Tracheal Procedure Assisted by Extracorporeal Membrane Oxygenator

김지언,정성호,마대성 대한흉부외과학회 2013 Journal of Chest Surgery (J Chest Surg) Vol.46 No.1

We report on the application of a venovenous type extracorporeal membrane oxygenator (ECMO) in high-risk tracheal procedures in six cases consisting of five patients with tracheal stenosis. An ECMO should be helpful for preventing respiratory emergency during a tracheal procedure.

소모성 질환에 이환된 이유자돈에 대해 Porcine cytomegalovirus DNA Polymerase 유전자 검출과 분석

김지언,김지영,楚佳奇,채미경,장경수,김명철,박창식,전무형 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

Porcine cytomegalovirus (PCMV) causes piglet deaths, runting, inclusion body rhinitis, respiratory and reproductive disorders in swine herd, resulting in the significant economic losses in the swine industry. Recently, in the field of pig-to-human xenotransplantation, PCMV has been indicated as a potential xenogeneic pathogen with the risk for infection transmitted from the xenograft donor to the recipient. In this study, PCMV DNA polymerase gene was detected in the sera and nasal swabs from 30 heads of the weaned piglets affected with various wasting diseases and 10 heads of normal healthy piglets using polymerase chain reaction (PCR), and the diagnostic efficacy of PCR was evaluated. The prevalence of the PCR-positive by specimens from the diseased piglets were 83.3% in sera and 33.3% in nasal swabs. In the normal healthy group, the PCR-positive rates of sera and nasal swabs were 40% and 30%, respectively. Ten piglets (25.0%) out of 40 showed the simultaneously positive results in both of sera and nasal swabs. According to this result, it was found that the serum specimen was the most appropriate sample for detection of PCMV by PCR. The nucleotide sequence homology of DNA polymerase gene of PCMV KS1 as compared with the reference strain of PCMV (GenBank accesson no.AF027217) was 99.0%.

클라우드 기반 3D 프린팅 활용 생산 시스템 통합 연구

김지언,David Espaline,Eric MacDonald,Ryan B. Wicker,김다혜,성지현,이재욱 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.3

After the US government declared 3D printing technology a next-generation manufacturing technology, there have been many practical studies conducted to expand 3D printing technology to manufacturing technologies, called AMERICA MAKES. In particular, the Keck Center, located at the University of Texas at El Paso, has studied techniques for easily combing the 3D stacking process with space mobility and expanded these techniques to simultaneous staking techniques for multiple materials. Additionally, it developed convergence manufacturing techniques, such as direct inking techniques, in order to produce a module structure that combines electronic circuits and components, such as CUBESET. However, in these studies, it is impossible to develop a unified system using traditional independent through simple sequencing connections. This is because there are many problems in the integration between the stacking modeling of 3D printers and post-machining, such as thermal deformations, the precision accuracy of 3D printers, and independently driven coordinate problems among process systems. Therefore, in this paper, the integration method is suggested, which combines these 3D printers and subsequent machining process systems through an Internet-based cloud. Additionally, the sequential integrated system of a 3D printer, an NC milling machine, machine vision, and direct inking are realized.

아동의 사회역량이 학교적응과 학업성취도 및 수업이해도에 미치는 종단적 영향: 자기회귀교차지연모형을 중심으로

김지언,신태섭 한국청소년학회 2023 청소년학연구 Vol.30 No.9

본 연구는 아동·청소년의 사회역량이 학업성취도 및 수업이해도에 영향을 미치는 지 살펴보고자 하였다. 이를 위해, 경기교육종단연구(Gyeonggi Education Panel Study)의 2차(초5), 4차(중1), 6차(중3)를 대상으로 사회역량과 학교적응, 학업성취도 및 수업이해도 간 종단적 인과관계를 자기회귀교차지연모형으로 분석하였다. 연구 결과는 다음과 같다. 첫째, 시간의 흐름에 따라 사회역량⋅학교적응⋅학업성취도⋅수업이해도의 수준이 안정적으로 유지된다는 것을 확인할 수 있었다. 둘째, 학년이 올라감에 따라 사회역량은 다음 시점의 학교적응에 정적인 영향을 미치는 것으로 나타났고, 수업이해도는 다음 시점의 사회역량과 학교적응에 정적인 영향을 미치는 것으로 나타났다. 본 연구에서 중2의 학교적응이 학업성취도와 수업이해도에 직접적 영향을 미칠 수는 있으나, 시간적 변동성에 따라 다르게 나타날 수 있음을 시사한다. 이러한 결과를 통해 학생들의 사회역량을 효과적으로 개발하고 학업적 성과를 향상시킬 수 있는 정책수립에 대한 근거를 제시할 수 있다. The purpose of this study was to investigate whether children's and adolescents' social competence affects their academic achievement and classroom understanding. For this purpose, social competence, school adjustment, academic achievement, and classroom understanding were measured for students in grades 2 (the 5th grade), 4 (the 7th grade), and 6 (the 9th grade) of the Gyeonggi Education Panel Study. The longitudinal causal relationship was analysed using an autoregressive cross-lagged model. The main results of this study are as follows. First, it was confirmed that the level of social competency, school adaptation, academic achievement, and class understanding did not change significantly and remained stable during the four years. Second, social competency was found to have a positive effect on school adaptation at the following point in time and class understanding had a positive effect on social competence and school adaptation at the following point in time as the grade level increased. This study suggests that school adaptation in middle school can have a direct effect on academic achievement and class understanding, but can manifest differently depending on temporal variability. These results can provide a basis for establishing policies that can effectively develop students' social competencies and improve academic performance.

내측측두엽 간질환자에서의 측위증후

김지언 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.4

저자는 약물에 반응하지 않는 내측측두엽간질로 진단받고 간질수술을 시행받은후 1년이상 추적관찰하여 간질발적빈도가 술전에 비해 90%이상 감소되었거나 또는 완전히 소실된 환자 35명을 대상으로 180회의 간질발작의 징후를 CCTV를 통한 비디오로 분석하여 다음과 같은 결론을 얻었다. 1. 간질유발병소를 추정하는데 가장 도움이 되는 측위증후는 병변과 동측의 자동증과 함께 반대편의 이긴장성자세가 관찰되는 경우(87%)였으며, 그 다음이 병변위치와 반대편의 이긴장성 자세가 단독으로 나타나는 경우(75%), 병변과 동측의 자동증만 나타나는 경우(70%)였다. 2. 두부회전은 처음부터 병변의 반대측으로 회전하는 경우보다 처음에는 동측으로 회전하였다가 다시 반대편으로 회전하는 경우가 더욱 측방성의 가치가 높았다. Various signs of lateralization have been described in temporal lobe epilepsy (TLE). They include unilateral automatism, unilateral dystonic posture, versive head and body turning, ictal speech and so on. Because their specificity is still unclear, they are used to a limited degree in lateralizing the side of ictal onset. We evaluate the value of lateralizing signs in patients with TLE. We analyzed semiology of 180 seizures in 35 TLE patients who were evaluated for epilepsy surgery at Dongsan Epilepsy Center between November, 1992 and October, 1995. All patients had received epilepsy surgery, and they were seizure free or exhibited aura only for at least 12 months following surgical resection. Unilateral dystonic posture alone was observed in 22 seizures [ipsilateral : 6(25%), contralateral: 16(75%)]. Unilateral hand automatism alone was observed in 33 seizures [ipsilateral: 23(70%), contralateral: 10(30%)]. Unilateral dystonic posture accompanied by automatism of the other side was observed in 56 seizures [ipsilateral automatism combined with contralateral dystonic posture : 48(87%), contralateral automatism combined with ipsilateral dystonic posture: 7(13%)]. Versive head turning was noticed in 35 enents [ipsilateral 4(11%), contralateral: 22(63%), initial ipsilateral to contralateral : 9(26%), initial contralateral to ipsilateral: 0]. We conclude that the most valuable lateralizing sign in TLE is contralateral dystonic posture accompanied by ipsilateral automatism, and ipsilateral hand automatism alone and contralateral dystonic posture alone are also significant.

Intermittent Embedding of Wire into 3D Prints for Wireless Power Transfer

김지언,Charlie Sullivan,Alexander Hillstrom,Ryan Wicker 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.5

3D printing is rapidly moving into the realm of electronics and fully functioning devices. These devices include 3D printed plastic parts with conductive materials embedded in the plastic using additive manufacturing techniques to produce functioning circuits. However, current materials and techniques limit the amount of power that can be supplied to embedded circuits. The state of the art for embedding traditional conductive materials, such as solid metal wire, uses the continuous application of heat. Continuous heat often overheats and damages the previously printed layer of plastic material potentially ruining the part and device. Additionally, current devices with embedded electronics require either external power or embedded energy storage such as a battery. Both the continuous application of heat and the need for power affect design choices and can severely limit potential use cases of the device. This research presents analysis and demonstration of embedding traditional copper wires onto a plastic substrate using intermittent application of heat and pressure using a traditional Fused Filament Fabrication plastic print nozzle at specific points, herein referred to as embedding instances. Detailed analysis of the interaction of a heating element (print nozzle), metal wire, and plastic substrate are provided to give context for the new technology presented. High thermal conductivity in the wire conducts heat away from the heating element quickly, and continuous application of heat to the wire can melt the plastic substrate along the wire, damaging previously embedded sections of wire, especially at the start of the embedding process and after turning sharp corners while embedding the wire. Applying heat for short periods at intermittent locations is presented as a solution to this problem while still melting the plastic enough to produce the bonding necessary for the wire to be embedded into the previous printed layer of plastic substrate. This technique is then used to manufacture a pair of identical parts, each with an embedded antenna intended for wireless power transfer. Once the first layer of wire antenna is embedded, additional layers of plastic are deposited to embed the copper wire completely within the part. Four separate embedded antenna layers of embedded wire are connected to create a multi layered, multi coil antenna in two identical parts. Experiments were then run to prove the viability of wireless power transfer from one part to the other.

랜덤 동적 개체의 군집 위치 제어 기법에 관한 연구

김지언,이민철 제어로봇시스템학회 2008 제어로봇시스템학회 국내학술대회 논문집 Vol.2008 No.10

A study on the application of laser cleaning process in shipbuilding industries using 100 W fiber laser

김지언,송무근,Myoung-Soo Han,김종도 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4

To address the limitations of existing surface cleaning technologies in shipyards, various studies are underway to apply the laser cleaning process, which uses a laser as a heat source, to pretreatment for painting and welding. Accordingly, this study conducted a cleaning experiment that uses a low power Q-switching fiber laser to remove the primer and oxide layer from the surface of steel for shipbuilding. To enhance the field applicability, this study derived the optimal laser cleaning process parameters that satisfy pretreatment standards. The main process parameters include scan speed and energy density. The most thoroughly cleaned surface was obtained at a scan speed corresponding to laser beam overlap rate of 20 % and an energy density of 10.5 J/cm 2 , and the working time was also significantly reduced. Therefore, this study is expected to be highly useful as important data for applying laser cleaning technology, which is receiving greater attention across many industries in addition to the shipbuilding and marine industry.

스테인리스 강판 맞대기 용접부의 레이저 클리닝 적용을 위한 기초 연구

김지언,정제한,손동영,임성택,김평수,최한섭,김종도 대한용접·접합학회 2020 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2020 No.11

파라과이 농촌지역 보건지소의 시설 관리 및 이용실태에 관한 연구[1] – 파라과이 림삐오시를 중심으로

김지언,김민규,남은우 한국의료복지건축학회 2020 의료·복지 건축 Vol.26 No.2

Purpose: The purpose of this study is to identify the operational status and current management of Sub-HealthCenters in Limpio, Paraguay. Second, understanding the use of Sub-Health Centers and Perceptions ofSub-Health Centers in Limpio, Paraguay. Third, Providing policy implications for strengthening the HealthDelivery System in Paraguay. Methods: The survey of the current status of sub-health centers in Limpio wasconducted with observation and interview. Utilization of Sub-Health centers was analyzed in the 2018 ParaguayCommunity Health Survey. A face to face interview was conducted to complete a questionnaire and 831samples were collected for the study. Results: In order to perform the normal function of the sub-health center,it will be necessary to allocate manpower that meets the standard. A common problem with sub-health centersin Limpio is that they have an environment vulnerable to rain. Currently, there are no health promotion andcommunicable disease management programs in sub-health center. Satisfaction of users about treatment,equipment, medicines and cleanleness of rooms. Implications: First, it is necessary to allocate human resourcesand organize spaces according to the standard. Second, there was a problem caused by moisture, andcontinuous maintenance and repair are required. Third, water and sewage related facilities must be safelyimproved to prevent contamination of groundwater. Forth, it is necessary to implement a program that fits therole of the sub-health center. Fifth, it is necessary to form a health delivery system considering the accessibilityof residents. Finally, it is necessary to discuss the location of sub-health center considering travel time of Limpioresidents.