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      • KCI등재후보

        골다공증성 척추체 압박 골절 환자에서 보행척도로 평가한 경피적 척추성형술의 결과

        김성호,도재원,윤석만,배학근,이경석,윤일규 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.35 No.1

        Objective:The purpose of this study is to evaluate the outcome of percutaneous vertebroplasty based on the ambulatory scale, classified at our institution, and to determine the factors influencing on prognosis of vertebroplasty. Methods : We retrospectively reviewed a consecutive patients undergoing percutaneous vertebroplasty between June 1999 and December 2001. A total of 151 patients underwent percutaneous vertebroplasty. We investigated the effects of clinical and radiological variables on ambulatory outcome of percutaneous vertebroplasty. Results : Ambulatory status was improved in 94.7% and 88.7% of the patients at postoperative 1 day and last follow-up, respectively. Symptom duration, the remain of vertebral body height, the level and numbers of procedure, the amount of PMMA and presence of PMMA leakage did not influence on the ambulatory outcome of vertebroplasty(p>0.05). A stepwise logistic regression analysis demonstrated that preoperative ambulatory score and the severity of osteoporosis were important prognostic factors at postoperative 1 day, while only the patients' age was a significant prognostic factor at last follow-up, in patients with osteoporotic compression fractures. Conclusion : Percutaneous vertebroplasty can be an effective treatment modality for improvement in ambulatory status in patients with osteoporotic vertebral compression fractures, especially when the osteoporosis is severe and preoperative ambulatory score is low. At long term follow-up, only patients' age has an important prognostic value. Key words:Percutaneous vertebroplasty;Ambulatory outcome;Prognostic factors;Osteoporotic compression fractures.

      • KCI등재
      • KCI등재후보

        Huge Schwannoma Extended from Craniocervical Junction to Upper Thoracic Spine

        김성호,도재원,윤석만,윤일규 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.34 No.6

        We report a case of 16 centimeter long schwannoma extended from craniocervical junction to upper thoracic spine that was successfully resected by posterior laminoplasty. However the patient developed postoperative kyphotic deformity at 3 months postoperatively, and it was corrected by anterior corpectomy and plate fixation. Key words:Schwannoma;Long segment;Kyphotic deformity.

      • KCI등재

        자외선 B 조사 hairless 마우스에서 일광화상세포 발생 억제에 대한 녹차의 효과

        김성호,김세라,이해준,이진희,김유진,김종춘,장종식,조성기 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.1

        In this study we assessed the influences of ultraviolet (UV) light B radiation on epidermal cells by apoptotic sunburn cell (SBC) and the effect of green tea treatment on the inhibition of SBC formation in SKH1-hr mouse. The extent of changes following 200 mJ/cm2 (0.5 mW/sec) was studied at 0, 3, 6, 12, 18, 24, 30 or 36 hours after exposure. SBCs were recognized by 3 hours after irradiation. There was tendency to increase from 3 hours to 24 hours and decrease from then to 36 hours after irradiation. The mice that received 0, 25, 50, 100, 200, 400 or 800 mJ/cm2 of UVB were examined 24 hours after irradiation. The SBCs were induced as the radiation dose increases from 0 to 200 mJ/cm2. A further increase of radiation dose has little further effect. The frequency of UVB (200 mJ/cm2)-induced SBC formation was reduced by intraperitoneal injection of green tea extract (p<0.01).

      • KCI등재후보

        포털사이트 이용자의 서비스 평가가 만족도와 충성도에 미치는 영향

        김성호,방호열 대한경영학회 2004 大韓經營學會誌 Vol.17 No.1

        The purpose of this study was to identify the factors that influence user's satisfaction and royalty to portal sites service. To evaluate portal sites' service quality, AIPD(Attracting, Informing, Positioning, Delivering) model was applied, which was proposed by Simeon(1999). Five hypothesis were developed. Data for empirical testing were collected through survey to portal sites user. Structural equation modeling was employed to test hypothesis. The result are, in general, supporting the proposed arguments. It shows that informing, positiong, delivering were the strong predictors of portal site user's satisfaction, and user's royalty was influenced by user's satisfaction.

      • KCI등재

        국내 자연 방사선 고준위 지역(청원군, 보은군) 사육 돼지의 림프구 미소핵 발생 평가

        김성호,이해준,김창모,김세라,이진희,김중선,김종춘,김일화,김태환,류시윤,조성기,최수용 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.4

        Cytogenetic and hematological analysis was performed in peripheral blood obtained from pigs bred in the high background radiation areas (HBRA) (Cheongwon-gun and Boeun-gun) and a control area. The frequencies of gamma-ray induced micronuclei (MN) in the cytokinesis-blocked (CB) lymphocytes at several doses were measured in three pigs. An estimated dose of radiation was calculated by a best fitting linear-quadratic model based on the radiation-induced MN formation from the swine lymphocytes exposed in vitro to radiation over the range from 0 mGy to 1,969 mGy. The measurements performed after irradiation showed dose-related increases in the MN frequency in each donors. The results were analyzed using a linear-quadratic model with a line of best fit of y = 0.0005404D2 + 0.04237D + 0.00833 [y = number of MN/cytokinesis-blocked (CB) cells and D = irradiation dose in Gy]. MN rates per 1,000 CB lymphocytes of pig from the HBRA (Cheongwon-gun, Boeun-gun) and the control area were 6.70 ? 2.36, 9.00 ? 3.50 and 11.00 ? 2.98, respectively. The MN frequencies of CB lymphocytes from pigs bred in three areas means that the values are within the background variation in this experiment. The MN frequencies and hematological values were similar regardless of whether the pigs were bred in the HBRA or the control area.

      • KCI등재후보
      • KCI등재

        석류추출액의 청징화를 위한 효소처리조건 최적화

        김성호,송경식,송방호,김종국,김인호,차태양,강복희,이진형,김종명,이진만 한국응용생명화학회 2005 Journal of Applied Biological Chemistry (J. Appl. Vol.48 No.3

        Response surface methodology was used to investigate clarification characteristics (turbidity, brown color, soluble solid, total sugar and reducing sugar) of enzyme in pomegranate extract. Enzyme was treated at 16 conditions including independent variables of temperature (35~55oC), time (30~70 min) and concentration (0.02~0.10%) based on central composition design. Turbidity was decreased with increase of enzyme concentration, and the minimum value of turbidity was 0.04 (OD) when 0.08% enzyme was treated at 37.99oC for 60.90 min. Total sugar was affected by all treatment conditions and the maximum value was 8.37% when 0.03% enzyme was treated at 39.28oC for 42.04 min. Reducing sugar and soluble solid were largely affected by enzyme concentration, and the maximum value of reducing sugar was 7.22% when 0.02% enzyme was treated at 42.96oC for 46.21 min. The maximum value of soluble solid was 8.13% when 0.02% enzyme was treated at 46.91oC for 42.13 min. 효소처리조건에 따른 석류추출액의 청징화특성을 조사하기 위하여 효소반응온도(35~55oC), 시간(30~70분) 및 농도(0.02~0.10%)를 중심합성계획법에 의한 16개 구간으로 설정하여 탁도, 갈색도, 가용성 고형분 함량, 총당 및 환원당 함량 등을 반응 표면분석법으로 모니터링하였다. 탁도는 주로 효소반응시간에 의하여 영향을 받고 있었으며, 처리온도 37.99oC, 처리시간 60.90분, 효소농도 0.08%일 때 탁도의 최소값이 0.04(O.D)로 나타났다. 갈색도는 효소농도에 가장 많은 영향을 받는 것으로 나타났으며, 처리온도와 처리시간에 대해서는 거의 영향을 받지않는 것으로 나타났으며, 총당의 함량은 처리온도, 처리시간, 효소농도에 대해 모두 영향을 받고 있었으며, 처리온도 39.28oC,처리시간 42.04분, 효소농도 0.03%일 때 최대값 8.37%을 나타내었다. 환원당 및 고형분 함량의 경우 효소농도에 가장 많은 영향을 받고 있었으며, 환원당은 처리온도 42.96oC, 처리시간 46.21분, 효소농도 0.02%일 때 최대값 7.22%를 나타내었고, 고형분 함량은 처리온도 46.91oC, 처리시간 42.13분, 효소농도 0.02%일 때 최대값 8.13%으로 나타났다. 각 변수에 대한 회귀식을 구한 후 탁도 및 갈색도의 최소값에 대한 최적효소처리조 건을 superimposing 한 결과 효소처리 조건은 온도 45~50oC,시간 50~60분 및 농도 0.06~0.08%이었다.

      • KCI등재

        가려진 물체의 움직임 표상과 지각된 지속시간 확장

        김성호 한국인지및생물심리학회 2016 한국심리학회지 인지 및 생물 Vol.28 No.2

        움직이는 물체가 다른 물체에 가려 잠시 시야에서 사라질 때도, 관찰자는 가려진 물체의 연속적인 움직임을 지각할 수 있다. 본 연구는 가려져서 보이지 않는 물체의 움직임 표상이 지각된 지속시간에 미치는 영향을 살펴보았다. 삼차원 입체 자극 상에서 표면의 양안시차를 조작하여, 한 물체의 가려진 움직임이 지각되는 조건과 시공간적으로 분리된 두 물체의 순차적 움직임이 지각되는 조건의 움직임 자극을 구현하였다. 이 두 자극의 지각된 지속시간을 각각 가시적인 움직임 자극과 비교한 결과, 가려진 움직임 조건의 지속시간이 상대적으로 더 길게 추정되었다. 이 결과는 시간지각에 영향을 준다고 알려진 시각적 요인인 변화의 현저성, 주의, 예측가능성 등의 효과로 설명되기 어렵다. 본 연구는 움직이는 물체가 가려질 때 발생하는 감각 정보의 시공간적인 공백을 메꾸는, 무형완성된 표면 표상의 지각적 중요성을 보여주며, 움직임 사건의 지속시간 지각이 운동량의 감각 정보가 아닌, 표면 표상이 매개된 상위 수준의 운동 표상에 영향받음을 시사한다. A moving object is temporarily invisible as it passes behind an occluding surface, but people perceive it as moving continuously behind the occluder, suggesting that the representation of the moving object is amodally maintained during its disappearance. The current study investigated whether the display where object invisibility is interpreted as amodal completion of a hidden object moving behind an occluder results in greater time dilation than in comparable displays that lack the interpretation of amodal completion, by manipulating the binocular disparity depth of the surface which can potentially work as an occluder in 3D displays. The result shows that the display involving amodally completed motion is perceived as longer in duration than the display where object invisibility does not entail amodal completion. This result runs counter to the prediction based on psychophysical factors previously implicated in time perception, such as overall stimulus salency, motion energy, attention and predictability. It suggests that time dilation for moving objects is mediated by higher level motion processing based on surface representation.

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