단계별 손상에 따른 화강암의 손상 발달특성 연구

박혁 ( Hyuck Park ),정교철 ( Gyo Cheol Jeong ) 대한지질공학회 2002 지질공학 Vol.12 No.3

암석의 손상에 따른 미세구조의 Micro Focus X-ray CT 및 투수성 특성

박혁 ( Hyuck Park ),추창오 ( Chang Oh Choo ),정교철 ( Gyo Cheol Jeong ) 대한지질공학회 2013 대한지질공학회 학술발표회논문집 Vol.2013 No.2

황색인대 골화에 의한 흉추부 척수증 및 신경근척수증 - 증례보고 -

이상대,이동열,정영균,박혁,조봉수,김수영,Lee, Sang Dae,Rhee, Dong Youl,Jeong, Young Gyun,Park, Hyuck,Cho, Bong Soo,Kim, Soo Young 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.10

Ossification of ligamentum flavum(OLF) is a type of ectopic bone formation developed within the spinal ligament. Thoracic myelopathy is common symptom of OLF but radiculopathy is uncommon. We present 3 operated cases of OLF. Two showed myelopathy and one radiculomyelopathy. Main symptoms were motor weakness, sensory disturbance, incoordination of both legs, and back pain. One patient complained of left girdle pain in T4 dermatome. Deep tendon reflex(DTR) was increased in all cases. The diagnosis was made from myelogram, CT and MRI. Sufficient posterior decompressive laminectomy and medial facetectomy were performed. Postoperative diagnosis was comfirmed by histopathological examination. One patient could return to work 3 months after operation and two patients showed satisfactory improvement 2-3 months after operation. Early diagnosis and appropriate surgical treatment were prerequisite of good outcome.

조기재취업수당의 제도 변화에 따른 효과분석 -2006년의 제도 변화가 실업기간에 미치는 효과를 중심으로-

김동헌 ( Dong Heon Kim ),박혁 ( Hyuck Park ) 한국사회보장학회 2011 사회보장연구 Vol.27 No.1

고용보험의 조기재취업수당은 2004년과 2006년 두 차례에 걸친 제도 변화로 인해 지원인원과 지원금액이 급증하였다. 특히 2006년 1월부터는 구직급여 수급자격자가 재취업한 시점에 따라 조기재취업수당을 차등적으로 지급함으로써, 수급요건의 변화는 없지만 실질적으로 보너스 금액을 증가시키는 효과를 보이고 있다. 본 연구는 고용보험 DB 자료를 이용하여 2006년의 제도 변화가 실업기간에 미치는 효과분석을 시도한다. 본 연구의 분석결과에 의하면, 2006년의 제도 변화로 인해 조기재취업수당 수급자의 구직급여 수급일수가 평균적으로 30% 단축되었다고 추정된다. 이는 구직급여 평균 수급일수가 15.9일 정도 단축되었다는 것을 의미한다. 2006년의 제도 변화가 어느 정도 구직급여 수급일수를 단축시키는 효과가 있음을 보여주지만, 이러한 제도 변화로 인해 구직급여 지급액의 절감보다는 조기재취업수당 지급액의 추가적 비용이 더욱 크기 때문에 전체 실업급여 지출비용을 절감하지는 못한 것으로 추정된다. There has been great changes in the reemployment bonus program in the employment insurance system since 2004. Especially in 2006, by providing differential bonus amounts based on the speed of reemployment of qualified recipients, there has been no change in qualification for a bonus but de facto increases in reemployment bonus amounts. In this paper, using recent employment insurance DB data, we analyze the impact of the policy change in reemployment bonuses in 2006 on the spell of insured unemployment and a cost-benefit analysis. Our analysis shows that, due to the program change in 2006, the spell of insured unemployment has been shortened by about 15.9 days. However, according to a simple cost-benefit analysis, the policy change has not produced cost-effective results, that is, results contributing to the decrease in overall expenditure costs of unemployment benefits.

다발성 "De Novo" 동맥류 1예 - 증 례 보 고 -

손성호,정영균,김수영,박화성,박혁,이동열,Son, Sung Ho,Jeong, Young Gyun,Kim, Soo Young,Park, Hwa Sung,Park, Hyuck,Rhee, Dong Youl 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.2

The development of completely new intracranial aneurysms after previous successfully treated aneurysm is uncommon. A 50-year-old female presented with a case of multiple de novo aneurysm which were an aneurysm of right ophthalmic segment of internal carotid artery and an aneurysm of right A1 artery, 6 years after the clipping of an aneurysm of right posterior communicating artery. She had no history of hypertension, cigarette smoking and use of oral contraceptives, and had no evidence of genetic disorder. The laboratory findings were normal. All de novo aneurysms were clipped by basal anterior interhemispheric approach in one stage due to the direction of the aneurysm of the ophthalmic segment of the internal carotid artery.

조기재취업수당의 제도 변화에 따른 참여율과 참여자 특성 변화

김동헌(Dong-Heon Kim),박혁(Hyuck Park) 한국노동연구원 2012 노동정책연구 Vol.12 No.4

고용보험의 조기재취업수당은 2004년에 커다란 제도상의 변화를 겪었다. 본 연구는 2004년의 제도 변화 이후 조기재취업수당 프로그램 참여율의 변화와 참여자 집단의 특성 변화를 분석하고자 한다. 구체적으로 고용보험 DB 자료를 이용하여 2004년과 2006년 조기재취업수당의 제도 변화에 따른 프로그램 참여율의 변화 추이를 살펴보고, 2002년의 조기재취업수당 자격자, 수급자, 신청자 집단의 특성과 2006년 자격자, 수급자, 신청자 집단의 특성을 비교 분석한다. 연구의 주안점은 2004년의 제도 변화 이후 그 이전에 관찰되었던 조기재취업수당 참여자의 특성에 있어 어떤 체계적인 변화가 발생하였는지 분석하는 것이다. 본 연구의 분석 결과에 의하면, 2004년 이후에도 남성, 30세 미만, 고학력계층이 조기재취업수당을 받을 가능성이 높다는 참여자 특성의 전반적인 패턴이 유지되고 있음을 확인할 수 있다. 이는 목표 효율성의 측면에서 보면 조기재취업수당의 제도적인 문제점으로 지적된다. There has been a great change of the reemployment bonus program in the employment insurance system since 2004. In this paper we analyze the changes of participation in the reemployment bonus program and characteristics of reemployment bonus program participants after the program change in 2004. Specifically, using employment insurance DB data, we review the changes in participation in the reemployment bonus program after the program changes in 2004 and 2006, and compare characteristics of reemployment bonus program participants in 2002 with those of reemployment bonus program participants in 2006. A main research topic is to analyze any systematic changes in characteristics of reemployment bonus recipients observed in 2003 after the program change in 2004. Our analysis shows that, even after the program change, some patterns of male, younger and highly educated having a higher possibility of receiving reemployment bonus has been maintained, as reported by Yoo (2007) using the 2003 data. This is a main problem in the policy design from the perspective of target efficiency.

급성뇌경색증에 동반된 악성 뇌부종 환자에 있어서 뇌경막확장성형술을 통한 두개골 감압술의 효용성

손성호,김수영,정영균,조봉수,박혁,이동열,Son, Sung Ho,Kim, Soo Young,Jeong, Young Gyun,Cho, Bong Soo,Park, Hyuck,Rhee, Dong Youl 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.9

Objectives : There is continuing controversy about the benefits of decompressive craniectomy in massive cerebral edema following space occupying hemispheric cerebral infarction. The aims of this study are to determine the effectiveness and to confirm the life-saving nature of decompressive craniectomy with dural augmentation for massive cerebral infarction. Patients and Methods : We present twelve patients with medically uncontrollable hemispheric cerebral infarction. All were treated with extensive craniectomy and duroplasty without resection of necrotic tissue. We evaluated various characteristics(size of hemispheric infarction, Glasgow Coma Scale, volume of low density and midline shift in CT) at three different periods(preoperative, immediate postoperative and 3-4weeks after operation) and evaluated effectiveness of hemicraniectomy for massive cerebral edema after large hemispheric infarction. Results : All patients have survived from surgery. Nine patients with nondominant hemispheric infarction showed significant functional recovery with minimal assistance, and remaining two patients with dominant hemispheric infarction and one patient with nondominant hemispheric infarction have functionally dependent. The volume of low density and midline shift in CT were significantly reduced after decompressive craniectomy. Conclusions : Our results indicate that decompressive craniectomy with dural augmentation without resection of necrotic tissue for massive cerebral hemispheric infarction not only reduce the mortality and infarction size but also significantly improve the outcome, especially for nondominant hemispheric infarction.

Paraclinoid 동맥류의 수술적 접근법

윤재웅,이동렬,정영균,김수영,박혁,백승국,Yoon, Jae-Woong,Rhee, Dong-Youl,Jeong, Young-Gyun,Kim, Soo-Young,Park, Hyuck,Baik, Seung-Kug 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.12

Objective : "Paraclinoid" aneurysms include those aneurysms arising from the internal carotid artery between the site of emergence of the carotid artery from the roof of the cavernous sinus and the origin of the posterior communicating artery. The authors reviewed and analysed the results of surgical approaches to paraclinoid aneurysms treated with transcranial surgery and endovascular surgery. Methods : Between January 1998 and May 1999, 14 patients were treated surgically through ipsilateral and contralateral pterional approaches, and anterior interhemispheric approach, and endovascular surgery for paraclinoid aneurysms. All transcranial approaches were performed by same surgeon. The medical records, neuroimaging studies and videotapes which had been recorded operations were reviewed retrospectively. Results : Twelve patients presented with subarachnoid hemorrhage and ICH. Nine of fourteen patients had multiple aneurysms. Thirteen cases were small and one was a large aneurysm. Six patients were treated through ipsilateral approaches, six contralateral pterional approaches, one anterior interhemispheric approach and one primarily by GDC embolization. All aneurysms treated through contralateral approaches were multiple aneurysms. Neck clipping was performed in 9(69.2%) of the thirteen aneurysms, wrapping in four cases, among them three cases were followed by GDC embolization. The surgical outcomes were : Glasgow Outcome Scale(GOS) I 71.4%, GOS II 21.4% and GOS V 7.1%. Conclusion : The surgical approaches to paraclinoid aneurysms should be chosen after careful anatomical evaluation of aneurysm and its neighboring structures. 3D-CT angiography and/or the raw data of MR angiography were useful. This study supports the usefulness of the contralateral approach to paraclinoid aneurysm associated with multiple aneurysms, unruptured and small aneurysms whose dome projecting medially, superiorly and dorsally. The determination of contralateral approach to small and medially projecting paraclinoid aneurysm may be stressful to operator, thus we believe anterior interhemispheric approach is better alternated. Also we recommend the endovascular surgery after reinforcement of aneurym neck and dome in the case with difficulty in clipping.

미소 촛점 X선 CT를 이용한 암석의 내부구조 분석

김종태 ( Jong Tae Kim ),( Manabu Takahashi ),박혁 ( Hyuck Park ),안창완 ( Chang Wan Ahn ),이창주 ( Chang Ju Lee ),김만일 ( Man Il Kim ),강미아 ( Mee A Kang ),추창오 ( Chang Oh Choo ),노병돈 ( Byung Don Ro ),정교철 ( Gyo Cheol 대한지질공학회 2010 대한지질공학회 학술발표회논문집 Vol.2010 No.-

경추 추간판절제술후 전방 골유합시에 자가골분진을 충전시킨 동결건조된 동종비골이식의 유용성

이상대,이동열,김수영,정영균,조봉수,박혁,Lee, Sang Dae,Rhee, Dong Youl,Kim, Soo Young,Jeong, Young Gyun,Cho, Bong Soo,Park, Hyuck 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8

Objective : This study was undertaken to evaluate the availability of allogenic fibular bone graft filled with autogenous bone dust in anterior cervical fusion after cervical discectomy. Methods : During a 4-year period(1995-1998), twenty four cases of anterior cervical fusion after discectomy were performed with fibular allograft filled with autogenous bone dust in degenerative cervical disease. We used freeze-dried fibular allograft and autogenous bone dust. Autogenous bone dust obtained from spondylotic spurs, osteophytes, and during foraminotomy. Cervical plating system was done at 8 patients. 5 patients were 1 level and 3 patients were 2 levels. All patients were routinely evaluated after surgery at 2 weeks, 1 month, 3 months, 5 months and 12 months. Mean follow-up period was 21months. Results : Eighty eight percent of the patients were found to have excellent or good clinical results. Radiographic follow-up revealed that 92% of the patients obtained complete or partial union by 5 months after surgery. One patient had graft extrusion immediately after surgery and had the graft reinserted. Two patients had longitudinal graft fractures. There were no graft related complications. Conclusion : Fibular allograft filled with autogenous bone dust for cervical interbody fusion after discectomy is an ideal graft material by showing obvious benefits of good fusion rate and elimination of donor site complications. And also we were able to obtain satisfactory clinical outcome.