• Journal of Korean Neurosurgical Society
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• 제47권2호
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• pp.134-136
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• 2010

Bow hunter's stroke is a rare symptomatic vertebrobasilar insufficiency in which vertebral artery (VA) is mechanically occluded during head rotation. Various pathologic conditions have been reported as causes of bow hunter's stroke. However, bow hunter's stroke caused by facet hypertrophy of C1-2 has not been reported. A 71-year-old woman presented with symptoms of vertebrobasilar insufficiency. Spine computed tomography showed massive facet hypertrophy on the left side of C1-2 level. A VA angiogram with her head rotated to the right revealed significant stenosis of left VA. C1-2 posterior fixation and fusion was performed to prevent serious neurologic deficit from vertebrobasilar stroke.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 추계학술대회 논문집
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• pp.83-86
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• 2003

YBa$_2$Cu$_3$$O_{7-x}$ thin films for coated conductor application were deposited on a MgO single crystalline substrate by a metal organic chemical vapor deposition (MOCVD) system of a vertical type using a single liquid source. The film uniformity was enhanced by controlling the gas shower head structure, the distance between the shower head and substrate, and the rotation of the substrate. The source mole ratio of Y(thd)$_3$: Ba(thd)$_2$: Cu(thd)$_2$ was changed for obtaining stoichiometric film. The phase formation, crystal orientation, surface morphology and film composition were investigated with different source mole ratios, and the critical temperature (T$_{c}$) was measured.red.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.555-556
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• 2007

Through the single head kinematics, sliding distance is a movement of a pad within wafer. The sliding distance is very important to frictional heat, material removal, and so on. A Temperature distribution is similar to sliding distance. But is not same. Because of complex process factor in CMP. A platen velocity is a dominant factor in a temperature and material removal. WIWNU is low in head faster condition.

• Research in Vestibular Science
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• 제17권4호
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• pp.167-169
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• 2018

Rotatory vertebral artery syndrome (RVAS) is characterized by recurrent attacks of vertigo, nystagmus, and syncope induced by compression of the vertebral artery during head rotation. A 60-year-old man with atlas vertebrae fracture presented recurrent attacks of positional vertigo. Left-beat, upbeat and count clock-wise torsional nystagmus occurred after lying down and bilateral head roll (HR) showing no latency or fatigue. Magnetic resonance imaging revealed foramen magnum stenosis (FMS) and dominancy of right vertebral artery (VA). The flow of the right VA on transcranial Doppler decreased significantly during left HR. The slower the velocity was, the more the nystagmus was aggravated. RVAS can be evoked by FMS causing compression of the VA. And the nystagmus might be aggravated according to the blood flow insufficiency.

• 생명과학회지
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• 제20권4호
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• pp.549-554
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• 2010

어깨 관절의 외선의 증대와 내선의 감소는 야구 투수들의 어깨에 주의 깊게 발생한다는 것을 알아야한다. 본 연구의 목적은 MRI 진단을 통해 상완골 후경각을 판단하고, 야구 투수들에게 정해진 각도에서의 길항근의 신장성 수축과 주동근의 단축성 수축을 통한 근력을 비교 분석하는데 있다. 대상자는 어깨관절의 통증을 경험하지 않은 9명의 투수들을 선정하였고, 투구측과 비투구측을 어깨관절을 대상으로 등속성 시스템을 이용하여, $90^{\circ}/s$와 $180^{\circ}/s$의 속도로 어깨관절의 내선 $90^{\circ}$와 외선 $20^{\circ}$의 범위에서 근력측정을 하였다. 모든 데이터는 대응 t검정을 사용해 분석 및 평가를 하였다(p<0.05). 그 결과 투구측의 총 가동역은 $180.1^{\circ}$로 나타났으며, 비투구측은 $183.7^{\circ}$로 나타났다. 상완골 후경각은 투구측이 $47.6{\pm}6.1^{\circ}$로 나타났으며, 비투구측은 $37.8{\pm}5.3^{\circ}$로 유의한 차이를 보였다(p<0.05). 투구측의 내선근 단축성 수축력(IR-Con)은 $31.5{\pm}5.1\;Nm$로 나타났으며, 비투구측의 $38.7{\pm}5.2\;Nm$와 비교해 유의한 차이를 보였다(p<0.05). 투구측의 외선근 신장성 수축력(ER-Ecc)도 $20.3{\pm}4.7\;Nm$로 나타났으며, 비투구측의 $25.1{\pm}3.7\;Nm$에 비교해 통계학적으로 유의한 차이를 보였다(p<0.05). 결론으로는 본 연구의 검토를 통해 투수들의 어깨관절에 있어서 외선의 증대 및 내선의 감소는 상완골 후경각의 골성의 변화가 중요한 요인으로 나타났으며, 근력의 변화에도 중대한 영향을 미치는 것으로 나타났다.

• 한국자동차공학회논문집
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• 제6권1호
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• pp.59-72
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• 1998

This experimental study was carried out to investigate the characteristics of the in-cylinder eccentricity swirl flow generated by a 4 valve cylinder head with a tangential and a helical intake port. the measurements of the in-cylinder velocity field have been made by a two-channel LDA system. The mean flow coefficient(Cf(meam)), swirl ratio(Rs) and mass flowrate with valve eccentricity ratios and an intake port partition between the two intake ports were measured in the steady flow test fig using the ISM(impulse swirl meter). The experimental results indicated that the mass flowrate through the tangential intake port was 19% and 7.7% more than that of the helical intake port in case of with and without intake port partition respectively. There was a tendency to be a single rotation flow in swirl flow fields formed by a 4 valve cylinder head because of the interaction between the two intake ports. As the intake port partition was not set between flow coefficient(Cf(mean)) was 7.35%.

• The Journal of Korean Physical Therapy
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• 제21권4호
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• pp.9-16
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• 2009

Purpose: This study was done to assess the effect of changes in forward head posture (FHP), neck mobility and headache clinical parameters on episodic tension-type headache (ETTH) and chronic tension-type headache (CTTH) who did craniocervial exercises. Methods: Twelve CTTH subjects and twelve ETTH subjects were studied. Side-view pictures of subjects were taken in both sitting and standing positions, in order to assess FHP by measuring the craniovertebral angle. Cervical range of motion (CROM) was employed to measure cervical mobility. A headache diary was kept to assess headache intensity, frequency, and duration. All subjects did three types of craniocervical exercise over 8 weeks. Measurements were done at pre-treatment, and at 4 and 8 weeks post-treatment. Results: Forward head posture and headache-related clinical parameters showed a significant improvement after craniocervical exercise (p<0.05). Flexion/extension and left/right rotation of CROM was significantly increased after the intervention (p<0.05), whereas changes in left/right bending did not reach statistical significance. Conclusion: This study indicates that craniocervical exercise may be effective in the management of tension-type headache.

• 대한정형도수물리치료학회지
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• 제25권1호
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• pp.1-7
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• 2019

Background: The purpose of this study is investigate the effects of cervical range of motion (ROM) and forward head posture (FHP) on cervical manual traction in normal adults. Methods: The subjects were randomly assigned to either the experimental group(Female 9, Male 6) who conducted the manual cervical traction or the control group(Female 9, Male 6) who did not conduct the any intervention. The subject in the EG have conducted the 1 set of 10 minutes of manual cervical traction per day, 2 times a week for 6 weeks. The cervical ROM was measured by the digital inclinometer and The factors of FHP was measured by cranial vertebral angle (CVA) and cranial rotation angle (CRA). Results: Comparing the cervical ROM and FHP between the experimental and control groups before and after the experiment, it could be seen that flexion, extension, right lateral flexion, left lateral flexion, CVA and CRA of the experimental group has been increased. Thus, cervical manual traction was resulted in the increased cervical ROM and decrease FHP. Conclusion: In this study, it was confirmed that cervical manual traction affects increase cervical ROM and decrease FHP that play a important role in neck stability and mobility.

• 대한치과교정학회지
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• 제31권1호
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• pp.25-38
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• 2001

편측성 II급 부정 교합 환자를 만나는 것은 임상에서는 흔한 일이지만, 치료 방법은 제한적 인 것이 사실이다. 그 중에서도 asymmetric head-gear는 그 사용의 횟수에 비해 정확하고 완전한 이해가 부족한 실정이며, 효과를 극대화시키기 위한 장치의 디자인에 대한 정보 역시 아직도 논란이 많고, 그 동안의 연구들도 확실한 해답을 주지는 못하고 있다. 더욱이 asymmetric iace-bow를 유한요소법을 통해 해석한 것은 그 예를 찾아볼 수 없었기에 본 연구를 시행하게 되었다. 발치나 교정치료의 경험이 없는 정상교합자를 대상으로 유한요소법을 사용하여 편측성 II급 부정교합의 상악 치열궁을 모델링하고, RMO사의 Face-Bow($Penta-Form^{TM}$/Medium size)를 기본 모델로 오른쪽의 outer-bow가 15mm, 25mm, 35mm씩 짧은, 세 개의 asymmetric face-bow를 모델링한 후, 편측성 II급 부정교합 상악 치열궁 모델의 좌,우측 상악 제 1대구치에 세 종류의 asymmetric face-bow를 적용, 편측당 0.3kgf의 힘으로 견인하여 비교한 결과, 다음의 결론을 얻었다. 1. 양쪽 제 1 대구치가 받는 힘의 총합은 세 경우 모두에서 거의 차이가 없었으나, outer-bow의 길이가 짧아질수록 근심위치된 치아가 받는 힘의 크기는 증가하였고, 정상 위치된 치아가 받는 힘의 크기는 감소하는 결과를 보였다. 2. 양쪽 제 1 대구치가 받는 측방력은, 정상 위치된 치아에서는 outer-bow의 길이가 짧아질수록 협측으로의 힘이 커졌고, 근심 위치된 치아에서는 협측으로의 힘이 작아지는 경향을 보여, outer-bow의 길이가 짧아질수록 전체적인 측방력이 정상 위치된 치아의 협측으로 이동되는 경향을 보이긴 했지만, 양쪽 제 1 대구치 모두 협측으로 힘을 받는 것으로 나타나 "Archial Expansion Effect"를 보였다. 3. 양쪽 제 1 대구치가 받는 원심력과 정출력, 그리고 distal tipping의 양은, 정상 위치된 치아에서는 outer-bow의 길이가 짧아질수록 감소하였고, 근심 위치된 치아에서는 outer-bow의 길이가 짧아질수록 증가하는 경향을 보였다. 4. 양쪽 제 1 대구치의 rotation은, 정상 위치된 치아에서는 distal-in의 rotation을 보였으며 outer-bow의 길이가 짧아질수록 그 양이 증가하였고, 근심 위치된 치아에서는 두 가지의 결과를 나타냈는데, outer-bow가 15mm 짧은 경우에는 distal-in의 rotation을 보였으나, 25mm와 35mm 짧은 경우에는 distal-out의 rotation을 보여 15mm와 25mm 사이에 변환점이 존재하는 것으로 나타났다. 5. 치근 분지부 직하방에서 치근막의 초기 응력분포를 관찰한 결과, 정상 위치된 치아의 원심협측 치근에서 outer-bow의 길이가 짧아짐에 따라 압축응력이 구개측에서 원심측으로, 그리고 협측으로 이동하는 양상을 나타내었다. 6. 치근 분지부 직하방에서 치근막의 초기 응력분포를 관찰한 결과, 정상 위치된 치아의 원심협측 치근을 제외한 근심협측 치근과 구개측 치근, 그리고 근심 위치된 치아의 세 개의 치근 모두는, outer-bow의 길이가 짧아질수록 응력의 크기만 변할 뿐 전체적인 응력분포의 양상에는 변화가 없었다.

• Clinics in Shoulder and Elbow
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• 제5권1호
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• pp.29-36
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• 2002

Purpose : Cubitus varus deformity has been reported to cause ulnar neuropathy. We present five cases of tardy ulnar nerve palsy due to cubitus vus and analyzed the factors related to the nerve plasy caused by the deformity. Materials and Methods : Three men and two women were reviewed retrospectively and the mean age of the patients were 26 (range, 14-38). The average interval from initial fracture to nerve palsy was 19 years (8-32 years). The severity of symptoms, according to McGowan's classification, was grade I of 2 patients, grade Ⅱ of 3 patients. Carrying angle was an average of 18。 (30° -45° ). Internal rotation angle measured by Yamamoto's method was an average of 33° (30° -45° ). Results ㆍ The mean follow-up period was 53 months (35-70 months). Elbow pain and numbness of the fingers were relieved shortly after surgery. It revealed that anterior subluxation of the nerve due to internal rotation deformity and compression of the nerve between the medially shifted medial head of triceps and the medial epicondyle. Conclusion : The major entrapment point of the nerve is the fibrous band between the two heads of the flexor carpi ulnaris. The severe internal rotation deformity may contribute the cause of tardy ulnar nerve palsy in cubitus varus deformity.