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조장혁,정석찬,윤선희,우훈식,주경준 한국경영과학회 1997 한국경영과학회 학술대회논문집 Vol.- No.2
미국방성에서 병참지원업무의 전화화로 시작한 CALS에 대한 관심은 현재 산업계에도 널리 확산되고 있다. 본 연구에서는 CALS의 시작이라고도 말 할 수 있는 형상관리(CM)에 관한 관련 표준들을 분석함으로서 '정보의 공유'라는 측면에서 CALS에 대한 접근을 시도하고자 한다. 형상관리는 병참지원시스템의 설계, 제조, 유지보수에 이르기까지 생명주기에 대한 모든 관리를 지원하는 방법이다. 이러한 형상관리를 위한 표준관련 문서에는 ,MIL-STD-2549, EIA/IS-649, MIL-HDBK-61등이 있다. 여기에서는 이런 표준관련 문서를 바탕으로 형상관리를 위한 하부 인프라 구조에는 어떠한 준비들이 필요하고 또 형상관리시스템을 실제로 구현하는 기업입장에서는 어떻게 바라보고 있는지, 실제 구현시에 고려해야 할 사항들은 어떠한 것들이 있는지에 대하여 논의해보고자 한다.
조장혁,조진호,김기태,Jo, Jang-Hyeok,Jo, Jin-Ho,Kim, Gi-Tae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10
Densification behavior of mixed copper and tool steel powder under cold compaction- was investigated. By mixing the yield functions proposed by Fleck et al. and by Gurson for pure powder in terms o f volume fractions and contact numbers of Cu powder, new mixed yield functions were employed for densification of powder composites under cold compaction. The constitutive equations were implemented into a finite element program (ABAQUS) to compare with experimental data and with calculated results from the model of Kim et al. for densification of mixed powder under cold isostatic pressing and cold die compaction. Finite element calculations by using the yield functions mixed by contact numbers of Cu powder agreed better with experimental data than those by volume fractions of Cu powder.
뇌졸중 후 편마비 환자에서 유발전위 반응에 따른 확산 텐서 영상과 손 기능
박기영,조장혁,이소영,배정호,손철호,손성일 대한재활의학회 2008 Annals of Rehabilitation Medicine Vol.32 No.2
Objective: To investigate the association between evoked potentials and fractional anisotropy (FA) ratio in posterior limb of the internal capsule and hand movement scale (HMS) in post-stroke hemiplegic patients. Method: Thirty-six post-stroke hemiplegic patients with a lesion in the internal capsule were included in this study. Diffusion tensor imaging (DTI) was performed with a 3.0 tesla MR at about 1 month after stroke. FA ratio was measured in posterior limb of the internal capsule of the patients. Motor evoked potential (MEP) was obtained by magnetic stimulation of the motor cortex and recorded from the abductor pollicis muscle. Somatosensory evoked potential (SSEP) was obtained by electrical stimulation of the median nerve at the wrist and recorded from the somatosensory cortex. Hand movement scale was obtained at about 1 month and 3 months after stroke. Results: Hand movement scale at about 1 month and 3 months after stroke and FA ratio were reduced significantly in patients who showed no response on MEP. However, no significant differences were observed between the patients who showed SSEP response and those who did not. FA ratio and hand movement scale were highly correlated to each other. Conclusion: MEP and FA ratio can be helpful in assessing the hand function at about 1 month and 3 months in post-stroke hemiplegic patients.
박기영,조장혁,이소영 대한재활의학회 2004 Annals of Rehabilitation Medicine Vol.28 No.6
The epidural lipomatosis is the unusual result of fat deposition in the extradural space of spinal canal, and most cases are associated with the chronic systemic steroid treatment. Symptoms related to spinal stenosis are postulated to result from spinal cord and nerve root compression. MR imaging is the first choice of the investigation method. Patients with acute progressive symptoms are best treated surgically, while others with stable symptoms can initially be treated medically with immediate tapering of their steroid dose. We reported one case of lumbar spinal stenosis induced by epidural lipomatosis receiving chronic steroid treatment. Surgical treatment could not be performed because of the poor general condition. Rehabilitation care and nonoperative therapy were effective in improving symptoms in lumbar epidural spinal stenosis induced by epidural lipomatosis