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( Hyun Su Baek ),( Hye Sung Lee ),( Bok Joo Kim ),( In Kyo Chung ),( Chul Hoon Kim ),( Sun Mi Jin ),( Hie Sung Hwang ),( Sang Hun Shin2 ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.6
The objective of this study was to evaluate platelet-rich fibrin (PRF)’s effectiveness in repairing articular disc defect in the temporomandibular joint (TMJ) of rabbits. Eight rabbits were divided into four groups of two rabbits each, corresponding to groups A, B, C, and D. Both TMJs of all of the rabbits were used in the experiments: the right joints comprised the experimental groups, and the left ones, the control groups. The disc defect was circular and 2 mm in diameter. In the experimental groups, the PRF was compressed into the defect, whereas the control group defects were left untreated. A, B, C, and D groups were sacrificed at the 1st, 2nd, 4th and 6th weeks, respectively. The defects of each control group exhibited no specific changes. Contrastingly, in each experimental group, there was an increased number of chondroblasts at the margins of the defects, along with accelerated cell differentiation and a columnar cell arrangement observable at the time of cell differentiation. The experimental groups showed inflammatory cell infiltrations and fibrosis by the 1st week, maturation of chondrocytes by the 2nd week, and proliferation by the 4th week, after which the defects began to be filled with chondrocytes, a process that was complete after the 6th week. In the histological evaluation (H-E), the experimental groups showed significant increases of chondroblasts after the 2nd and 4th weeks, as well as regular columns of chondrocyte arrays observable during cell division. After 6 weeks, the defects were filled with chondrocytes.
Hyun Park,Woo‑Jin Lee,Jae‑Han Son,Han‑Kyun Shin,Sung‑Kyu Hong,Hyo‑Jong Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
We introduce a cost-effective method that combines electroplating with metal cold working processes to manufacture compositetubes with robust corrosion resistance. First, a 3-step electroplating process was developed to form an adhesive anduniform Ag coating on the outer wall of a 304 stainless steel tube. The process consisted of a Ni-strike step for removing thepassivation layer of the initial 304 tube, Cu deposition for smoothing the surface by adding a buffer layer, and Ag deposition. To reinforce the interfacial adhesion between the electroplated layers and the 304 tube and increase the area of the Ag coating,a pilger rolling or pilger rolling + heat-treatment process was performed after the Ag electroplating process. Scanningelectron microscopy of the composite tubes after each process indicated that the as-deposited Ag coating changed fromhaving a rough to smooth surface after only pilger rolling and with additional heat treatment. Electron backscatter diffractionanalysis of the microstructures and textures of the tubes revealed that dynamic recrystallization occurred extensively duringpilger rolling, resulting in the formation of a relatively defect-free grain structure without heat treatment. Furthermore,electrochemical polarization curves determined that the Ag-coated composite tubes are superior to the uncoated 304 tubein terms of corrosion resistance under Cl−atmosphere, owing to the formation of a AgCl passivation layer during testing. Surface analysis of the composite tubes suggests that the properties of the AgCl passivation layer are related to the grainsize of the Ag coating and the density of plastic-deformation-induced defects.
Kim, Shin-Hyun,Park, Hyo Sung,Choi, Jae Hoon,Shim, Jae Won,Yang, Seung-Man WILEY-VCH Verlag 2010 Advanced materials Vol.22 No.9
<B>Graphic Abstract</B> <P>The cover shows a schematic illustration of patterned colloidal photonic crystals with different bandgap positions. When an unknown light source impinges on the patterned photonic crystals, the light information can be identified from the reflection intensity profile of the constituent photonic crystals. The two optical microscopy images and background image display integrated photonic crystals with 20 different bandgaps spanning the entire visible range, and the SEM image shows the cross-section of the photonic crystal stripes, as reported by Shin-Hyun Kim, Seung-Man Yang, and co-workers on p. 946. <img src='wiley_img_2010/09359648-2010-22-9-ADMA201090022-content.gif' alt='wiley_img_2010/09359648-2010-22-9-ADMA201090022-content'> </P>
예비 영유아교사를 위한 자아탄력성 증진 프로그램이 자아탄력성과 공감능력에 미치는 영향
박진성 ( Park Jin-sung ),신현정 ( Shin Hyun-jung ) 미래유아교육학회 2017 미래유아교육학회지 Vol.24 No.2
본 연구의 목적은 예비 영유아교사를 위한 자아탄력성 증진 프로그램이 자아탄력성과 공감능력에 미치는 효과를 살펴보는 것이다. 본 연구에서 개발된 예비 영유아교사를 위한 자아탄력성 프로그램은 자신감 및 유능감, 긍정적 사고, 문제해결능력, 감정조절 및 관리, 친밀한 태도와 행동, 대인관계능력을 통하여 자아탄력성 향상을 세부목표로 하였다. 본 연구의 대상은 4년제 대학의 예비 영유아교사 99명이며, 실험집단에 12회에 걸쳐 자아탄력성 증진 프로그램을 실시하였다. 프로그램의 평가를 위하여 Klohnen(1996)이 개발한 자기보고식 자아탄력성 도구를 박현진(1997)에 번역한 자아탄력성도구와 Mehrabian & Epstein(1972), Davis(1980), Bryant(1982) 도구를 전병성(2003)이 수정한 공감능력 검사 도구를 통하여 검사를 실시하였으며, 수집된 자료는 t-검증을 실시하였다. 본 연구 결과, 예비 영유아교사를 위한 자아탄력성 증진 프로그램은 예비 영유아교사의 자아탄력성에서 낙관적 태도와 분노조절, 자아탄력성 전체에 효과가 있었으며, 정서공감과 인지공감 등 공감능력 모두에 효과를 나타냈다. The purpose of this study was to investigate the effects of the ego-resiliency enhancing program on ego-resiliency and empathy of pre-service early childhood teachers. The contents of ego-resilience enhancing program for pre-service early childhood teachers included self-confidence, positive thinking, problem solving, emotion regulation, intimate attitude and behavior, and interpersonal relationship. The subjects of this study were 99 pre-service early childhood teachers. The experimental group had 12 sessions with the ego-resiliency enhancing program. The rating scale was used with a rating scale of ego-resiliency by Hyun-Jin Park(1997) and a rating scale of empathy by Byung-Suk Jun(2003). The data were analyzed by t-test. The result of this study was that the ego-resiliency enhancing program was effective for improving ego-resiliency and empathy for especially positive behavior, anger adjustment, cognitive empathy and emotional empathy of pre-service early childhood teachers.
Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
Sung, Se-Yong,Lee, Won-Yeon,Yong, Suk Joong,Shin, Kye Chul,Park, Hae-Sim,Kim, Hyun-Mi,Kim, Sang-Ha The Korean Academy of Asthma, Allergy and Clinical 2012 Allergy, Asthma & Immunology Research Vol.4 No.1
<P>Corn is a major staple food, along with rice and wheat, in many parts of the world. There are several reports of hypersensitivity to maize pollen. However, cases of occupational allergic rhinitis induced by inhalation of maize pollen are very rare. We herein report the case of a 67-year-old male with occupational rhinitis caused by occupational exposure to maize pollen in a cornfield. He showed positive responses to maize pollen, as well as grass pollens, in skin prick tests. A high level of serum immunoglobulin E (IgE) specific to maize pollen extracts was detected by an enzyme-linked immunosorbent assay (ELISA). Laboratory tests showed a high serum level of total IgE (724 kU/L) and a high level of IgE specific to maize pollen (8.32 kU/L) using the Immuno-CAP system. Occupational rhinitis was confirmed by a nasal provocation test with maize pollen extracts. IgE ELISA inhibition tests showed antibody cross-reactivity between maize pollen and grass pollen extracts. IgE immunoblotting using maize pollen extracts demonstrated a 27 kDa IgE-binding component. These findings suggest that maize pollen can induce IgE-mediated occupational rhinitis in exposed workers.</P>
Cutaneous complications following BCG vaccination
( Sang-hyeon Won ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Hoon-soo Kim ),( Byung-soo Kim ),( Moon-bum Kim ),( Hyun-chang Ko ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Bacillus Calmette-Guerin (BCG) vaccination has been normally used to prevent severe infections caused by Mycobacterium tuberculosis. Although BCG vaccination is generally safe, some cutaneous complications may occur. However, cutaneous complications related to BCG infection are rarely investigated. Objectives: To investigate the clinical characteristics of cutaneous complications following BCG vaccination. Methods: We reviewed the clinical data of the patients who were referred to Pusan National University Hospitals (Busan and Yangsan) from 2002 to 2019. Among them, 24 patients were diagnosed with cutaneous complications following BCG vaccination, which can be classified as specific or non-specific type. Results: There was female predominance (M:F=1:2). There was a bimodal age distribution of the patients, from 0 to 3 years and 22 to 28 years. There were 18 specific type (75%) and 6 non-specific type (25%). In specific type cases, local abscess, disseminated infection, BCG reactivation in Kawasaki disease, lymphadenitis, papular tuberculid were found in 38.9%, 22.2%, 22.2%, 11.1%, and 5.6% of cases, respectively. In non-specific type cases, keloid formation was found in all cases. Conclusion: The most common cutaneous complications following BCG vaccination was local abscess in specific type, and keloid in non-specific type. This study suggests the diversity of cutaneous complications that may be found after BCG vaccination.
Mixed tumor of the skin: clinicopathological study of 25 cases
( Sang-hyeon Won ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Mixed tumor of the skin also known as chondroid syringoma is an uncommon, benign and adnexal tumor which is composed of a mixture of epithelial and stromal elements. There have been only a few studies of mixed tumor of the skin in Korea. Objectives: To investigate the clinical and histopathological characteristics of mixed tumor of the skin in Korea. Methods: We reviewed the clinical data and histologic slides of 25 patients who were diagnosed with mixed tumor of the skin at Pusan National University Hospitals (Busan and Yangsan) between 2007 and 2019. Results: There was almost no sex predilection (M : F=1 : 1.08), and the mean patient age was 58.2±15.9 years (range 22∼84 years). Of the 25 cases, the lesions were located on the head in 92%. Histopathologically, there were 21 apocrine type cases (84%) and 4 eccrine type cases (16%). In apocrine type cases, decapitation secretion, follicular, and sebaceous differentiation were found in 76%, 33%, and 24% of cases, respectively. Myxohyaline stroma were observed in 100% of cases, chondroid metaplasia in 44% and lipomatous metaplasia in 28%. Conclusion: Mixed tumor of the skin was most commonly observed as an asymptomatic firm subcutaneous nodule on the head in middle-aged people. The apocrine type was more common than the eccrine type. Our findings stress the diversity of differentiation and metaplasias that may be found in mixed tumor of the skin.