자동차 엔진용 플라스틱 실린더 헤드 커버의 설계평가에 관한 연구

김정엽,이동명,최명진 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-

This study pertains to the feasibility of the conversion of an aluminum alloyed automotive engine cylinder head cover into a plastic cylinder head cover. Due to the complexity of the geometry, the finite element analysis is used to evaluate deformations and stresses, an adaptive method is also used to economize the computation. Without modification of the specification of the aluminum alloyed cylinder head cover, there will be no resonance but fracture is anticipated for the plastic cylinder head cover. To maintain the same dimensions, it is proposed to use a material with, at least, ?? Young's modulus.

일차적 비확공성 골수강 고정술로 치료한 제3형 개방성 경골 골절

오창욱,경희수,김도헌,박일형,김풍택,인주철,우연기,이정엽 대한골절학회 2004 대한골절학회지 Vol.17 No.2

제 3형 구상돌기 골절의 수술적 치료

전인호,민우기,오창욱,경희수,박병철,김풍택,인주철,이정엽 대한골절학회 2004 대한골절학회지 Vol.17 No.4

목적: 8례의 제 3형 척골 구상돌기 골절에 대해 수술적 치료 후 임상적 방사선학적 결과를 보고하고자 한다. 대상 및 방법 : 8명의 구상돌기 골절에 대한 후향적 연구를 시행하였다. 대상은 모두 남자였으며 평균 나이는 33세였다. 3례에서 척골 구상돌기 단독 골절이었으며 2례에서 주관절 탈구가, 2례에서 요골 두 및 경부 골절이, 1례에서 내측 측부인대 손상이 동반되었다. 전례에서 전방 도달법을 통해 유관나사를 이용한 관혈적 정복 및 내고정이 시행되었다. 평균 추시 기간은 31개월 이었으며 (24~60개월), Mayo Elbow Performance Score로 임상적 결과를 판정하였다. 결과 : 최근 추시에서 평균의 능동적 주관절 가동범위는 105°였다. 평균의 Mayo Elbow Performance Score는 76.9점이었다(50~95). 1례에서 최우수, 4례에서 우수, 2례에서 양호, 1례에서 불량의 결과를 보였다. 결론 : 제 3형의 척골 구상돌기 골절에서 조기의 관혈적 정복 및 안정적인 내고정으로 신뢰할 만한 치료를 제공하였으며, 손상 주관절의 동반된 인대손상과 복합골절은 중요한 예후인자로 간주되었다. Purpose: To review the clinical results of eight cases of typeⅢ coronoid process fractures which were treated operatively. Materials and Methods : Eight patients with coronoid type Ⅲ were reviewed retrospectively. All were men with an average age of 33. There were three isolated fractures, two elbow dislocations, two radial head and neck fractures, and one medial collateral ligament rupture. Open reduction and internal fixation through anterior approach with canulated screws was used. The patients were followed up for a mean of 31 months(24 to 60). Results: Average active elbow joint motion at the most recent follow up was 105°. The average Mayo Elbow Performance Score was 76.9 (50 to 95). There was one excellent result, four good, two fair, and one poor. Conclusion: Early open reduction and stable internal fixation provided a reliable method for the treatment of typeⅢ coronoid process fractures. Any associated ligament injuries to the elbow and fracture comninution were considered as important prognostic factors.

Cerebellar Gray Matter Volume and its Role in Executive Function, and Attention: Sex Differences by Age in Adolescents

Hayeon Kim(Hayeon Kim),Bumhee Park(Bumhee Park),Shin-Young Kim(Shin-Young Kim),Jiyea Kim(Jiyea Kim),Bora Kim(Bora Kim),Kyu-In Jung(Kyu-In Jung),Seung-Yup Lee(Seung-Yup Lee),Yerin Hyun(Yerin Hyun),Bung 대한정신약물학회 2022 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.20 No.4

Objective: This research measures the regional GMV (rGMV) of the cerebellum, attention, Executive Function (EF) and we aimed to identify their correlation and sex differences in children and adolescents. Methods: Subjects comprised 114 children (male = 62, female = 52, 12.44 ± 2.99 years old) from South Korea. Participants were divided into three groups by age (age 6−9, 10−13, and 14−17). The Stroop Color and Word Test (SCWT), Wisconsin Card Sorting Test (WCST), and Advanced Test of Attention (ATA) were used to estimate executive function. Magnetic resonance imaging (MRI) images were analyzed with Regional Voxel-Based Morphometry Analysis. Results: The correlations between cerebellar rGMV and SCWT, WCST, and ATA subcategories showed difference by age and sex. In 6−9 age group, girls showed more overall correlations with cerebellar regions than boys, in WCST Categories Completed and ATA results. In age 10−13 group, more regions of cerebellum corresponded to SCWT subcategories in girls. Nevertheless, more correlation between cerebellar rGMV, WCST subcategories and some ATA subtests were observed in boys in the same age group. In the adolescent group, aged 14−17, boys showed more correlation with cerebellar rGMV, while girls showed little correlation. Conclusion: This study highlights that sex-different cerebellum maturation in adolescence might be correlated with EF and attention. These results provides evidence that cerebellum modulates higher cognitive functioning during child development.

Developing a national surveillance system for stroke and acute myocardial infarction using claims data in the Republic of Korea: a retrospective study

Kim Tae Jung,Lee Hak Seung,Kim Seong-Eun,Park Jinju,Kim Jun Yup,Lee Ji Yoon,Song Ji Eun,Hong Jin-Hyuk,Lee Joongyub,Chung Joong-Hwa,Kim Hyeon Chang,Shin Dong-Ho,Lee Hae-Young,Kim Bum Joon,Seo Woo-Keun 질병관리청 2024 Osong Public Health and Research Persptectives Vol.15 No.1

Objectives: Limited information is available concerning the epidemiology of stroke and acute myocardial infarction (AMI) in the Republic of Korea. This study aimed to develop a national surveillance system to monitor the incidence of stroke and AMI using national claims data.Methods: We developed and validated identification algorithms for stroke and AMI using claims data. This validation involved a 2-stage stratified sampling method with a review of medical records for sampled cases. The weighted positive predictive value (PPV) and negative predictive value (NPV) were calculated based on the sampling structure and the corresponding sampling rates. Incident cases and the incidence rates of stroke and AMI in the Republic of Korea were estimated by applying the algorithms and weighted PPV and NPV to the 2018 National Health Insurance Service claims data.Results: In total, 2,200 cases (1,086 stroke cases and 1,114 AMI cases) were sampled from the 2018 claims database. The sensitivity and specificity of the algorithms were 94.3% and 88.6% for stroke and 97.9% and 90.1% for AMI, respectively. The estimated number of cases, including recurrent events, was 150,837 for stroke and 40,529 for AMI in 2018. The age- and sex-standardized incidence rate for stroke and AMI was 180.2 and 46.1 cases per 100,000 person-years, respectively, in 2018.Conclusion: This study demonstrates the feasibility of developing a national surveillance system based on claims data and identification algorithms for stroke and AMI to monitor their incidence rates.

A case of onychopapilloma presenting as longitudinal melanonychia

( Jung Min ),( Jung Yup Kim ),( Sun Min Lim ),( Jae Yun Lim ),( Ju Yeon Choi ),( Han Saem Kim ),( Jung In Kim ),( Joon Hong Min ),( Young Jun Choi ),( Jae Hui Nam ),( Ga Young Lee ),( Won Serk Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Onychopapilloma is an uncommon benign neoplasm of the nail matrix and nail bed. The clinical feature of onychopapilloma is not specific, and the majority of cases present clinically as localized longitudinal erythronychia, exceptionally as leukonychia or melanonychia. It is characterized histologically by distal subungal hyperkeratosis and nail matrix metaplasia of the nail bed with marked papillomatosis. A 50-year-old man presented with 3 year history of a longitudinal pigmented streak of the left index fingernail. He reported tenderness of the lesion. He had been treated with antifungal agent for 3 months, but showed no response after 1 year of follow up. He had a history of ankylosing spondylitis. Total excision was done, and the histologic findings showed papillomatous nail matrix squamous epithelial hyperplasia and thick keratin layer in the distal nail bed. A periodic acid-Schiff test did not reveal fungal elements. The patient showed good response without recurrence. We concluded that these findings were consistent with onychopapilloma presenting as longitudinal melanonychia, which was not a common clinical feature. Our case adds onychopapilloma to the list of conditions that can induce melanonychia.

Neutrophilic eccrine hidradenitis: associated with eosinophilic granulomatosis with polyangiitis

( Jung In Kim ),( Jung Yup Kim ),( Sun Min Lim ),( Jae Yun Lim ),( Ju Yeon Choi ),( Han Saem Kim ),( Jung Min ),( Joon Hong Min ),( Young Jun Choi ),( Jae Hui Nam ),( Ga Young Lee ),( Won Serk Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Patients with eosinophilic granulomatosis with polyangiitis (EGPA) may develop palpable purpura and nodules, typically located on the limbs and scalp, which showed leukocytoclastic vasculitis mostly involving venules with the findings of numerous eosinophils in the infiltrate, in addtion to neutrophils, lymphocytes and macrophages. A 39-year-old Korean female presented with a 2-week history of localized, bilateral, multiple, and polycyclic to annular, smooth erythematous to reddish edematous papules and plaques with indurated subcutaneous nodules on the both palms. Ten days before visit our dermatology clinic, the patient was diagnosed with EGPA and had done only workup for EGPA diagnosis without any treatments or medications until visit dermatology clinic. She had no medications and did not do anything which can stimulate her hand. Hematoxylin and eosin staining showed perivascular patchy mixed inflammatory infiltrates of eosinophils, lymphocytes and plasma cells in the dermis, and focal dense neutrophils, eosinophils and lymphocytes infiltrates in the subcutaneous layer with eccrine glands area. We report a case of EGPA with unusual palmar eruption that revealed the clinicopathologic findings of neutrophilic eccrine hidradenitis (NEH). Despite the absence of previous cases, NEH may be considered as an additional skin manifestation that can be seen in patients with EGPA.

FCT 2-1 Effectiveness and safety of a novel picosecond Nd:Yag laser in the treatment of hypertrophic scars in Korean skins

( Jung Yup Kim ),( Sunmin Yim ),( Jae Yun Lim ),( Ju-yeon Choi ),( Han-saem Kim ),( Jung-in Kim ),( Jung Min ),( Joon Hong Min ),( Young Jun Choi ),( Jae Hui Nam ),( Ga-young Lee ),( Won-serk Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2

Background: Scars can affect patients, leading to emotional complications. Various laser technologies including fractional laser, Q-Switched Nd:YAG laser, and pulsed dye laser have been tried to revise the scar. Up to now, there has been no reliable study to evaluate an effect of picosecond Nd:YAG laser for reducing scars. Objectives: This retrospective clinical study was performed to investigate the beneficial effect of picosecond Nd:YAG laser in treatment for hypertrophic scars. Methods: A retrospective review was conducted on patients treated with picosecond Nd:YAG laser for the purpose of scar improvement. Twenty-seven patients with hypertrophic scars were included in this study. The vancouver scar scale (VSS), global assessment score (GAS), and participant’s subjective satisfaction were used to determine the effect of scar improvement. All side effects were recorded to assess the safety of the modality. Results: Mean age of patients was 33.4±15.2 years old and male-to-female ratio was 2:3. Mean total treatment session was 3.4±1.3 and mean total duration of treatment was 13±7.3 weeks. Average VSS score was remarkably decreased after treatment. Average GAS and participant’s satisfaction indicated fair cosmetic improvement. No significant side effects were observed during follow-up. Conclusion: Picosecond Nd:YAG laser may be considered as an effective and safe optional modality for the treatment of scar.

근력 보조가 가능한 말단 장치 형태의 보행 재활 로봇의 개발

김정준(Jung-Joon Kim),김명주(Myeong-Ju Kim),곽노식(No-Sik Kwak),김창휘(Chang-Hwi Kim),김형식(Hyeongsic Kim),김정엽(Jung-Yup Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.8

본 논문은 보행 재활이 필요한 환자들을 위해 하지 근력 보조가 가능한 보행 재활 로봇의 개발에 대하여 서술하였다. 최근 상용화된 대표적인 보행 재활 로봇들의 경우 비싼 가격, 큰 부피, 고 중량, 불편한 착용 등의 단점들로부터 대중화 및 시장성에 한계를 보여왔다. 이러한 한계점들을 해결하기 위하여 본 연구로부터 세 가지 전략이 적용된 새로운 보행 재활 로봇을 개발하였다. 첫째, 말단 장치의 위치 및 각도 궤적이 정상인의 발 보행 궤적과 일치하는 5절 링크 메커니즘 및 발 착지면을 최적화 설계하였다. 둘째, 두 개의 링크 메커니즘의 크랭크축을 단 하나의 기어드 모터 구동축으로 결합하여 전체 기구부를 구동시키도록 함으로써 비용, 무게 및 부피를 최소화하였다. 셋째, 환자의 장애 정도에 따른 세 가지 보행 재활 모드를 제안하였으며, 특히, 기구부에 장착된 센서들로부터 보행 의도를 인식하고 이로부터 하지 근력을 효과적으로 보조할 수 있도록 하였다. 최종적으로 EMG센서를 통해 각 보행 재활 모드에 따른 근력 보조 성능을 실험적으로 검증하였다. This paper describes the development of a walking rehabilitation robot capable of lower body power assistance. Recently commercialized walking rehabilitation robots have several drawbacks such as high price, large volume, heavy weight, and uncomfortable fit; hence, they still have limitations in terms of popularity and marketability. To resolve these issues, we developed a novel walking rehabilitation robot with three strategies. First, a five-link mechanism and curved foot landing surface were optimally designed so that the position and angle trajectories of the end-effector can coincide with the foot walking trajectory of a normal person. Second, the price, weight, and volume were minimized by connecting the two link mechanisms with a shaft and driving it using a single-gear motor. Third, we proposed three walking rehabilitation modes based on the degree of disability and walking intention. Finally, the power assist performance of each mode was experimentally verified through EMG measurement.

P073 Rosacea and its association with enteral microbiome and systemic diseases

( Han-saem Kim ),( Jung Yup Kim ),( Sunmin Yim ),( Jae Yun Lim ),( Ju-yeon Choi ),( Jung-in Kim ),( Jung Min ),( Ho Joo Jung ),( Joon Hong Min ),( Young Jun Choi ),( Jae Hui Nam ),( Ga-young Lee ),( W 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2

<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Rosacea is a common chronic inflammatory skin disease. Recently, it is revealed that systemic diseases are associated with rosacea. Objectives: To investigate the relationship between gut microbiome, associated diseases and rosacea. Methods: A cross-sectional analysis was performed among healthy female subjects. Study data were obtained from 282 subjects who participated in a health check-up program. Rosacea was assessed by a questionnaire. Other medical illnesses were evaluated by thorough medical examination and history taking. Stool microbiota was analysed by QIIME (Quantitative Insights Into Microbial Ecology) software. Results: The study included 12 patients with rosacea and 270 subjects without rosacea (control group). After adjusting for age, body mass index (BMI) was significantly higher in rosacea patients as compared with the control group (odds ratio 1.20, 95% confidence interval 1.02-1.42). Seven metagenomic genera were correlated with rosacea: Peptococcaceae family unknown genus, Methanobrevibacter genus, Acidaminococcus genus, Megasphaera genus, Lactococcus genus, Eggerthella genus, Lactobacillales order unknown family unknown genus (p<0.05). Conclusion: This study shows that rosacea is associated with BMI and specific gut microbiota.