To know recent research works in neurosurgical fields and to analyze neurosurgery related sites on the internet, authors have been searching sites on the web offering the neurosurgical resources. From December 1995 to October 1996 we used a modem(28.8Kbps) and thereafter connected to a LAN(local area network). Under the environment of Windows 95, we used web browsers with Netscape 2.02 and Netterm 2.89. We got an medical information with PC journals or seminars and graded the neurosurgical center/institutes from A to E according to the quality of web sites. We could use the internet resources more rapidly in the early morning than noon or evening. Best sites for neurosurgeon were MedMark(http://www.medmark.bit.co.kr/neurosur.html) and Neurosource (http://www.neurosource.com/). The more comprehensive academic neurosurgical site among all web were the Massachusetts General Hospital(http://neurosurgery.mgh.harvard.edu/) and the University North California (http://sunsite.unc.edu/Neuro/uncns/home.html). In 89 neurosurgical center/institutes, 72 sites(80.9%) couldn't supply sufficient information. In conclusion, there are many webs related to neurosurgery on the internet, but useful sites for neurosurgeon are not common. It is necessary to make an effort to find available sites offering more information in the future.
California ; Internet* ; Massachusetts ; Neurosurgery ; Web Browser

STATEMENT OF PROBLEM: Elastomeric impression materials have been widely used to obtain an accurate impression. However there have not been enough studies on the influence of the thickness of the tray adhesives on the bonding strength between the trays and the elastomeric impression materials. PURPOSE: In order to understand the relationship between the thickness of the tray adhesive and the tensile bond strength and to suggest the thickness at which the bonding strength is strongest, tensile bond strength related to the thickness of adhesives of 3 different elastomeric impression materials were tested. MATERIALS AND METHODS: 3 impression materials, Permlastic(R) Regular Set(Kerr Corp., Romulus, Michigan, U.S.A.), Impregum(TM) Penta(TM)(3M ESPE, Seefeld, Germany), and Aquasil Ultra Monophase Regular Set Smart Wetting(R) (Dentsply Caulk, Milford, Delaware, U.S.A.), were used in this study, and tray adhesives from the same manufacturers of the impression materials were used, which were Rubber Base Adhesive, Polyether Adhesive, and Silfix, respectively. The tray specimens were prepared by autopolymerizing the tray material(Instant Tray Mix, Lang, Wheeling, Illinois, U.S.A.), and a PVC pipe was used to house the impression material. In group A, tray adhesives were applied in multiple thin layers of 1 to 5 and in group B, adhesives were applied only once, in the thickness equivalent to several applications. Lightness(L*) of the adhesion surface was measured with a spectrophotometer (CM-3500d, Konica Minolta, Sakai, Osaka, Japan). The tensile bond strength of the elastomeric impression material and the tray resin was measured with universal materials testing machines(Instron, Model 3366, Instron Corp, Nowood, Massachusetts, U.S.A.). A formula between the number of adhesive application layers and the lightness of the adhesion surface was deduced in group A, and the number of adhesive layers in group B was estimated by applying the lightness(L*) to the deduced formula. RESULTS: 1. In group A, a statistically significant increase in tensile bond strength appeared when the number of application layers increased from 1 to 2 and from 4 to 5, and no significant difference was present between 2, 3, and 4 layers in Permlastic. In Impregum, the tensile bond strength was significantly increased when the number of adhesive layers increased from 1 to 3, but no significant difference after 3 layers. In Aquasil, the tensile bond strength significantly increased as the number of application layers increased up to 4 but showed no significant difference between 4 and 5. 2. In group B, the tensile bond strength was decreased when the thickness of the adhesive increased in Permlastic. Impregum showed an increased tensile bond strength when the thickness of the adhesive was increased. In Aquasil, the tensile bond strength increased as the number of adhesive application layers increased up to approximately 2.5 layers but it sharply decreased after approximately 4.5. CONCLUSION: From the study, the common idea that it is better to apply a thin and single coat of tray adhesive needs correction in more detailed ways, and instructions on some of the tray adhesives should be reconsidered since there were several cases in which the tensile bond strength increased according to the increase in the thickness of the adhesives.
Adhesives* ; Delaware ; Elastomers* ; Illinois ; Massachusetts ; Materials Testing ; Michigan ; Rubber

STATEMENTS OF PROBLEM: The fracture of acrylic resin dentures remains an unsolved problem. Therefore, many investigations have been performed and various approaches to strengthening acrylic resin, for example, the reinforcement of heat-cured acrylic resin using glass fibers, have been suggested over the years. Silane is important for bonding between glass fiber and resin. PURPOSE: The aim of the present study was to investigate the effect of various silane on the strength of PMMA resin and roughness of resin-glass fiber complex after abrasion test. MATERIAL AND METHODS: 3mm glass fiber (Chopped strand, Hankuk fiber Co., Milyang, Korea) was treated with 3 kinds of silane (MPS, EPS, APS) (Sila-ace, Chisso chemical, Tokyo, Japan) and mixed with PMMA resin(Vertex RS, Vertex Dental B.V., Zeist, Netherlands). Transverse strength and Young's modulus was measured using Instron (Instron model 4466, Instron, Massachusetts, USA). After abrasion test (The 858 Mini Bionix II Test System, MTS System Co., Minnesota, USA) surface roughness was evaluated using tester (Form Talysurf plus, Taylor Hopson Ltd., Leicester, England). Examination of scanning electron microscope was also performed RESULTS: Within this study, the following conclusions were drawn. 1. Surface treatment of glass fiber with MPS and APS increased transverse strength of PMMA resin complex, but surface treatment with EPS decreased transverse strength of PMMA resin complex (p<0.05). 2. Silane treated glass fiber increased Young's modulus of PMMA resin complex compared to desized glass fiber (p<0.05). 3. Roughness increased after abrasion test in case of PMMA resin reinforced with desized glass fiber (p<0.05). 4. Roughness change was not observed after abrasion test in case of PMMA resin reinforced with silane treated glass fiber (p>0.05).
Dentures ; Elastic Modulus ; Glass* ; Gyeongsangnam-do ; Massachusetts ; Minnesota ; Polymethyl Methacrylate*

OBJECTIVE: This study was designed to make a comparison of motor function according to the age group after the rehabilitation management in poststroke hemiplegic patients. METHOD: We examined 23 cases of young age stroke with hemiplegia aged < or =50 years and 24 cases of old age stroke aged > or =70 years. Motor power of affected side was measured by Motricity Index (MI) and Trunk Control Test (TCT). Level of ambulation was determined by Massachusetts General Hospital Functional Ambulation Classification (MGHFAC). Scores of each scale at admission and reassessment were obtained after rehabilitation management to compare the level of motor function in each age group and according to the age group. RESULTS: Scores of MI, TCT and MGHFAC scale were significantly increased after rehabilitation management in each group. Although both groups differed regarding to those of MGHFAC, there was no difference for the increment of MI and TCT according to the age group after rehabilitation. CONCLUSION: Both age group showed significant improvement of the motor function and ambulation level after rehabilitation management. Ambulation level improvement of younger patient was greater than that of older patients. However, there was no difference in the extent of motor function improvement of affected side according to the age groups.
Classification ; Hemiplegia ; Hospitals, General ; Humans ; Massachusetts ; Rehabilitation* ; Stroke* ; Walking

BACKGROUND: The objective of this study was to report on the prevalence of musculoskeletal pain in lobstermen in the northeast USA. METHODS: Crews were randomly selected from those licensed to fish in Maine and Massachusetts and followed prospectively. The survey used a Nordic Musculoskeletal Questionnaire format to characterize musculoskeletal disorders. RESULTS: A total of 395 individuals participated. One half of the respondents reported low back pain. Back pain was attributed to or exacerbated by lobstering. Low back pain was prevalent among both captains and sternmen, while sternmen reported more hand/wrist pain than captains. Multiple locations for pain were common in individual participants. CONCLUSION: Equipment or technology to assist material handling should be a priority, as the body segments with high prevalence of pain (back, hand/wrists, shoulders, knees) are all affected by the repetitive and forceful handling of the lobster traps.
Back Pain ; Low Back Pain ; Maine ; Massachusetts ; Musculoskeletal Pain ; Prevalence ; Prospective Studies ; Shoulder ; Surveys and Questionnaires

Ratio analysis allows a hospital to evaluate its own performance over time and to compare its performance with that of other hospitals. For this study, three types of ratio analysis were conducted based on some data on hospitals in Massachusetts. First, Key ratios influencing financial performance were identified using discriminant analysis. Second, the financial structures of the teaching and the non-teaching hospitals were compared using ratios and multiple comparison method. Third, the effects of the prospective reimbursement law of the state on financial performance were examined using ratios and paired t-test. The purpose of the law is to reduce hospital costs by setting the revenue ceiling prior to the effective budget year. The findings of this study were as follows: 1) When hospitals were divided into three groups, according to their operating income, only profitability ratios showed a consistent difference among the groups. 2) In the discriminant analysis, five ratios were selected: current ratio, operating margin, return on assets, fixed assets turnover, and inventory turnover. They are the key ratios to be monitored periodically for the purpose of evaluating the financial performance of hospitals. 3) When teaching hospitals were compared with non-teaching hospitals, acid ratio, days of cash on hand, and inventory turnover were statistically significant before the law went into effect, whereas only fixed assets turnover and inventory turnover were significant afterward. Contrary to previous studies, profitability ratios of teaching hospitals were higher than those of non-teaching hospitals, although the differences were not statistically significant. 4) When the ratios between the two periods (before and after the law) were compared, three profitability ratios (operating margin, return on assets, and return on equity) were significant for teaching hospitals, whereas three activity ratios (total assets turnover, fixed assets turnover, current assets turnover) were significant for non-teaching hospitals. Furthermore, while both total operating revenue and expenses were decreased, net operating income was increased, due to a greater decrease in total operating expenses. This shows that the law can indeed, simultaneously, achieve both a reduction in costs as well as improvement in the financial situation of hospitals.
Budgets ; Hand ; Hospital Costs ; Hospitals, Teaching ; Jurisprudence ; Massachusetts ; Prospective Payment System

Biological Science Disciplines ; history ; China ; History, 20th Century ; History, 21st Century ; Internationality ; Massachusetts

BACKGROUND: This article intended to identify and describe areas in need of services and interventions for individuals with autism spectrum disorder (ASD) and their families in Seoul, Korea. METHODS: A descriptive comparison was made between available services and interventions in Seoul, Korea and Massachusetts, USA. Relevant information was obtained through sending phone/email inquiries to the governments and organizations, visiting their official websites, and searching for published articles or reports. RESULTS: In a few areas such as level of education, economy, and general quality of healthcare, Seoul was found to be similar to Massachusetts. However, in terms of services and interventions for individuals with ASD and their families, especially early identification and intervention, special education, care coordination, school-based programs, and transition to adulthood, Massachusetts was shown to have far more availability. CONCLUSION: The limited availability of services and interventions for individuals with ASD and their families in Seoul in comparison to Massachusetts, underlines target areas for further investment and development.
Autism Spectrum Disorder ; Autistic Disorder ; Education ; Education, Special ; Humans ; Investments ; Korea ; Massachusetts ; Quality of Health Care ; Seoul

BACKGROUND: By using ACL 9000 coagulation analyzer (Instrumentation Laboratory Co., Lexington, Massachusetts, USA), we tried to investigate the possibility that activated partial thromboplastin time (aPTT) clot waveform analysis (CWA) may provide additional information on patients with hemophilia A.METHODS: Plasma samples were obtained from 35 patients with hemophilia A. The factor VIII levels of those patients were measured by a conventional one-stage factor VIII:C clotting assay and a factor VIII antigen assay. The data were applied to a Microsoft excel program calculating the index of the second derivative, and the time at point b (Min2), the point in time that clotting is initiated was also calculated.RESULTS: The corresponding aPTT clotting times were prolonged in all 9 patients with severe hemophilia A. The CWA could further discriminate between different levels of FVIII:C in the patients (n=20), with a FVIII:C level <4 IU/dL by conventional assay. The correlation between FVIII:C and the recalculated aPTT using Min2 was very high in patients with FVIII:C < or =4 IU/dL (r=0.952). Among the 9 patients who showed a lot of discrepancy from the FVIII:C level, there was 8 patients with mild hemophilia and 1 patient with moderate hemophilia (FVIII:C level 4.5%).CONCLUSION: Our study suggested that CWA and Min2 values might have greater discriminatory power in assessing low clotting factor activity. Further study is needed, including more patients with hemophilia A using CWA, correlation according to the severity group, a lower limit of detection for VIII:C, and a multiple one-stage assay.
Factor VIII ; Hemophilia A ; Humans ; Limit of Detection ; Massachusetts ; Partial Thromboplastin Time ; Plasma

An attenuated vaccine strain AVR1/08 of Korean respiratory type of infectious bronchitis virus (IBV) was developed by 89th passages of IBV D85/06 strain in chicken eggs. The AVR1/08 strain had higher virus titer at least 20 times (10(1.3)) than the parent virus D85/06 by egg inoculation method. The AVR1/08 strain had a single point mutation (S to Y) at position 56 of spike protein of IBV compared to parent virus IBV D85/06 strain. The mutation was observed consistently at viruses after 47th passage in chicken eggs. The AVR1/08 strain showed no virulence even after 6 passages in chickens and all chickens inoculated induced anti-IBV antibody 14 days after vaccination. The AVR1/08 strain had broad protective efficacy against QX type Korean nephropathogenic virus (Q43/06 strain), KM91 type Korean nephropathogenic virus (KM91 strain) and Korean respiratory virus (D85/06 strain). In contrast, Massachusetts (Mass) type attenuated vaccine strain H120 showed protection of 37.5 to 50% against these three viruses. Our results indicate that the AVR1/08 strain has potential as an attenuated vaccine effective in controlling IBVs circulating in Korea.
Chickens ; Eggs ; Humans ; Infectious bronchitis virus ; Korea ; Massachusetts ; Ovum ; Parents ; Point Mutation ; Sprains and Strains ; Vaccination ; Viral Load ; Viruses