강도 보강재가 의치상 레진의 파절강도에 미치는 영향

전하라,양홍서 전남대학교 치과대학 1998 전남치대논문집 Vol.10 No.1

The purpose of this study is to determine the fracture resistance of acrylic resins with the reinforcement of various strengtheners. Four strengtheners were used in this study. A heat-curing resin(H) and a self-curing resin(S) were tested separately. First, they were tested without the strengtheners. They will be called H1, S1 group. The second test samples (H2, S2) included mesh. The third test samples (H3, S3) used one wire as a strengthener. The fourth test samples (H4, S4) used two wires. Finally, the fifth test samples(H5, S5) used polyethylene fiber as a strengthener. Each group consisted of 15 pieces. There were 150 pieces in total. Each test sample was 40×13×3mm. Each piece was immersed in mineral water for 2 days at 37℃. Each sample was then tested and measured for strength in a fracture test(3-point bending test), with a Universal testing machine. The Results were as follows : 1. The heat curing resin without the strengthener was stronger than the wire, mesh, and polyethylene fiber strengtheners. 2. All the strengtheners increased the strength of the self-curing resin. 3. The self-curing resin with polyethylene fiber and with wire strengtheners were more efficient than with mesh strengthener. The test results for heat-curing resins showed that strengtheners were not needed. But for self-curing resins, strengtheners were needed for getting better transverse strength efficiency.

The Usefulness of M-B CDI-K Short Form as Screening Test in Children With Language Developmental Delay

김성우,Ha Ra Jeon,Eun Ji Park,Hyo In Kim,Da Wa Jung,Mee Ryung Woo 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.3

Objective: To investigate the usefulness of MacArthur-Bates Communicative Development Inventories-Korean (M-B CDI-K) short form as a screening test in children with language developmental delay.Methods: From April 2010 to May 2012, a total of 87 patients visited the department of physical medicine and rehabilitation of National Health Insurance Service Ilsan Hospital with the complaint of language developmental delay and were enrolled in this study. All patients took M-B CDI-K short form and Sequenced Language Scale for Infants (SELSI) or Preschool Receptive-Expressive Language Scale (PRES) according to their age.Results: The study group consisted of 58 male patients and 29 female patients and the mean age was 25.9 months. The diagnosis are global developmental delay in 26 patients, selective language impairment in 31 patients, articulation disorder in 7 patients, cerebral palsy in 8 patients, autism spectrum disorder in 4 patients, motor developmental delay in 4 patients, and others in 7 patients. Seventy-one patients are diagnosed with language developmental delay in SELSI or PRES and of them showed 69 patients a high risk in the M-B CDI-K short form. Sixteen patients are normal in SELSI or PRES and of them showed 14 patients non-high risk in the M-B CDI-K short form. The M-B CDI-K short form has 97.2% sensitivity, 87.5% specificity, a positive predictive value of 0.97, and a negative predictive value of 0.88. Conclusion: The M-B CDI-K short form has a high sensitivity and specificity so it is considered as an useful screening tool in children with language developmental delay. Additional researches targeting normal children will be continued to supply the specificity of the M-B CDI-K short form.

Neurodevelopmental Disorders of Children Screened by The Infantile Health Promotion System

김성우,Ha Ra Jeon,Zee-A Han,최자영,Hee Jung Chung,Young Key Kim,Yeo Hoon Yoon 대한재활의학회 2011 Annals of Rehabilitation Medicine Vol.35 No.6

Objective To perform an in depth evaluation of children, and thus provide a systematic method of managing children, who after infantile health screening, were categorized as suspected developmental delay. Method 78 children referred to the Developmental Delay Clinic of Ilsan Hospital after suspected development delay on infantile health examinations were enrolled. A team comprised of a physiatrist, pediatrician and pediatric psychiatrist examined the patients. Neurological examination, speech and cognitive evaluation were done. Hearing tests and chromosome studies were performed when needed clinically. All referred children completed K-ASQ questionnaires. Final diagnoses were categorized into specific language impairment (SLI),global developmental delay (GDD), intellectual disability (ID), cerebral palsy (CP), motor developmental delay (MD) or autism spectrum disorder (ASD). Results 72 of the 78 patients were abnormal in the final diagnosis, with a positive predictive value of 92.3%. Thirty (38.4%) of the 78 subjects were diagnosed as GDD, 28 (35.8%) as SLI, 5 (6.4%) as ASD, 9 (12.5%) as MD, and 6(7.6%) as normal. Forty five of the 78 patients had risk factors related to development, and 18 had a positive family history for developmental delay and/or autistic disorders. The mean number of abnormal domains on the K-ASQ questionnaires were 3.6 for ASD, 2.7 for GDD, 1.8 for SLI and 0.6 for MD. Differences between these numbers were statistically significant (p<0.05). Conclusion Because of the high predictive value of the K-ASQ, a detailed evaluation is necessary for children suspected of developmental delay in an infantile health promotion system.

Impact of Acute Kidney Injury on Survival in Patients With Chronic Hepatitis C

( Hankyu Jeon ),( Jae Heon Kim ),( Sang Soo Lee ),( Hee Jin Kim ),( Ra Ri Cha ),( Hyun Chin Cho ),( Jae Min Lee ),( Chang Yoon Ha ),( Hyun Jin Kim ),( Tae Hyo Kim ),( Woon Tae Jung ),( Ok-jae Lee ) 대한간학회 2021 춘·추계 학술대회 (KASL) Vol.2021 No.1

일체형 선루프 Tubeless Frame 최적구조의 신뢰성 평가

하지훈(Jihoon Ha),최수윤(Suyoon Choi),전병윤(Byeongyun Jeon),라명수(Myeongsu Ra),정선기(Sunkee Jung) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11

Recently, the most important thing is reliability for quality on the sunroof market. Quality is very important to ensure profitability with cost saving and reduced weight. And it must be available to the driver without the inconvenience when traveling. In existing paper, the integrated frame sunroof system was minimized the number of parts and reduce the quality problem by reducing the assembly process. In addition, it was possible to reduce the manufacturing time and production cost due to the process improvements. Based on this, some of the test evaluation was performed to ensure reliability for existing paper (Optimum Structural Design of Tubeless Frame System of the Sunroof on the Car Body). Thus in this paper, In order to satisfy the domestic automotive standard were performed test and evaluation of the durability and noise, environmental.

일체형 선루프 Tubeless Frame의 최적구조설계

하지훈(Jihoon Ha),최수윤(Suyoon Choi),전병윤(Byeongyun Jeon),라명수(Myeongsu Ra),정선기(Sunkee Jung) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5

Recently, quality decrease in parts with the growth of the global automotive industry are one of the most important issues. In particular, the sunroof system that is closely related to the quality and sensitivity of the consumer is composed of more than 200 parts. It is also produced through a number of processes. In addition the quality problem will be more important because it operates in a variety of conditions. Previously, if a frame and tube are assembled into individual structures on the sunroof system, Current development structure is the way two parts is made integrally. The integrated frame sunroof system can minimize the number of parts and reduce the quality problem by reducing the assembly process. In addition, it is possible to reduce the manufacturing time and production cost due to the process improvements. In this paper, the integrated frame is designed optimal structure.

Improvement of Dysphagia after Anterior Cervical Screw Removal: A Case Report

김성우,Jung Bin Shin,Ha Ra Jeon 대한연하장애학회 2015 대한연하장애학회지 Vol.5 No.2

Dysphagia is common complication which might occur in spinal cord injury patients after anterior cervical fusion procedure. But it is rare to have anterior cervical fusion removal for dysphagia and thus such cases are difficult to find. Therefore, we are reporting the case where the symptoms of dysphagia, caused by posterior and anterior fusion in spinal cord injury patient, were improved after anterior fusion removal. It was 64 years old male patient who had C2-6 compressive myelopathy, which was caused by falling down from the bed, and later he received Posterior Spine Fusion (PSF) and Anterior Cervical Discectomy & Fusion (ACDF). After that, he showed gradual recovery of muscle strength but dysphagia was continued and thus percutaneous endoscopic gastrostomy (PEG) tube insertion was done. Rehabilitation therapy was done for dysphagia but its symptoms continued and thus anterior cervical screw removal was done. After that, dysphagia was improved and PEG tube removal was done 6 months after anterior plate removal. Anterior fusion removal can improve symptoms of dysphagia and increase the quality of life of the patient in selected cases.

The Differences in Clinical Aspect Between Specific Language Impairment and Global Developmental Delay

Seong Woo Kim,Ha Ra Jeon,Eun Ji Park,Hee Jung Chung,Jung Eun Song 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.6

Objective To compare and analyze the clinical characteristics of children with delayed language acquisition due to two different diagnoses, which were specific language impairment (SLI, a primarily delayed language develo­pment) and global developmental delay (GDD, a language delay related to cognitive impairment). Methods Among 1,598 children who had visited the developmental delay clinic from March 2005 to February 2011, 467 children who were diagnosed with GDD and 183 children who were diagnosed with SLI were included in this study. All children were questioned about past, family, and developmental history, and their language com­petences and cognitive function were assessed. Some children got electroencephalography (EEG), in case of need. Results The presence of the perinatal risk factors showed no difference in two groups. In the children with GDD, they had more delayed acquisition of independent walking and more frequent EEG abnormalities compared with the children with SLI (p<0.01). The positive family history of delayed language development was more prevalent in children with SLI (p<0.01). In areas of language ability, the quotient of receptive language and expressive language did not show any meaningful statistical differences between the two groups. Analyzing in each group, the receptive language quotient was higher than expressive language quotient in both group (p<0.01). In the GDD group, the Bayley Scales of Infant Development II (BSID­II) showed a marked low mental and motor quotient while the Wechsler Intelligence Scale showed low verbal and nonverbal IQ. In the SLI group, the BSID­II and Wech sler Intelligence Scale showed low scores in mental area and verbal IQ but sparing motor area and nonverbal IQ. Conclusion The linguistic profiles of children with language delay could not differentiate between SLI and GDD. The clinicians needed to be aware of these developmental issues, and history taking and clinical evaluation, including cognitive assessment, could be helpful to diagnose adequately and set the treatment plan for each child.

Rehabilitation Treatment of a Child Diagnosed With Duplication of 1q42-q44: A Case Report

Seong Woo Kim,김지용,Ha Ra Jeon,Min Jung Park,Yoon Kim 대한재활의학회 2016 Annals of Rehabilitation Medicine Vol.40 No.5

Trisomy 1 is a rare chromosomal anomaly and has never been reported in Korea. Clinical features of trisomy 1 include macrocephaly, prominent forehead, flat nasal bridge, low set ears, and micrognathia, all of which result in a very distinguishable facial structure. A child with trisomy 1 also suffers from mental retardation and/or developmental delays. In this case report, the child was diagnosed with de novo trisomy 1 without receiving any treatment until visiting our hospital. The child suffered from foot and ankle deformities, leading her unable to stand independently. Here we report the surgical treatment and rehabilitation treatment that enabled the child to walk independently.

Clinical Characteristics of Children with Rett Syndrome

Zee-A Han,Ha Ra Jeon,김성우,박진영,Hee Jung Chung 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.3

Objective To identify the clinical characteristics and investigate function related aspects of Korean children with Rett syndrome. Method A total of 26 patients diagnosed as Rett syndrome were clinically observed until the age of fi ve or over. We surveyed past history, developmental history, and presence of typical clinical features of Rett syndrome. Furthermore, we investigated diff erences in clinical characteristics according to functional status and changes in clinical features related to growth. Results There were no problems related to gestational, perinatal or neonatal history. Only 12 patients had an ultimate head circumference of less than 3 percentile. Developmental regression was definite in all patients. At final assessment, only 14 patients were able to walk. Twenty patients had an epileptic history requiring medication. Sixteen patients with scoliosis showed progression during serial follow-up. Th e percentage of patients who were able to walk before 16 months was higher in the high function group than the low function group. Th e age of regression was 5.4 and 4.0 years in the high and low function group respectively, but the diff erence was not statistically signifi cant. Scoliosis was more severe and seizure onset age was younger in the low function group. Conclusion We investigated 26 clinical characteristics in Korean children with Rett syndrome. Their clinical features change according to age, and we believe such knowledge could be utilized in rehabilitation to minimize their disabilities.