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초경합금 소재 LCU_CL 코어의 초정밀 연삭 특성에 관한 연구
정상화,차경래,김현욱,이봉주 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
As the various manufacturing technology of optical glass is developed, the aspherical lenses are applied to many fields. However, It is still very difficult to manufacture glass lens because of the high cost and the short life of core. In recent years, the demands of the aspherical glass lenses increase since it is difficult to obtain the desirable performance in the plastic lens. In the glass mold lens, it has merits of high productivity and reproductivity since lens is manufactured by the only forming with high precision mold. The fabricating conditions for glass mold lens are glass surface that does not cause fusion, viscosity of 108-1013 poise for the 0.2㎛ accuracy, and viscoelasticity for the roughness less than 100 angstrom. In this thesis, ultra-precision grinding characteristics of tungsten carbide for forming the aspherical glass lens core were studied and the result of it is applied to manufacture the tungsten carbide-base core of the glass lens used to the laser scanning unit and the camera phone.
RO 및 NF막에서의 부식질에 의한 Fouling 및 미량오염물질의 제거
왕창근,차준철,이용현,김수동,류주환 대한상하수도학회 2004 상하수도학회지 Vol.18 No.1
This study investigated the phenomena of membrane fouling by NOM and the effect of the fouling on removal of micro-pollutants. NOM has a great effect on decline of permeate flux. Permeate flow rate was reduced by 88% in RO and 34.8% in NF for 323hr operation period. Removal rate of UV_(254), is 87.4% in RO and 78.5% in NF and removal rate of DOC is 42.7% in RO and 32.9% in NF for 2㎎/l humic acid. Removal efficiency of the micmpollutants by the RO and NF membranes fouled by humic acid was mostly lower than that by the new membrane. The concentration polarization which affects the flux and the rejection was thought to occur in the active layer of the membrane, as the membrane was getting fouled.
FCP 7 : Cutaneous foreign body reaction induced by retained bee sting
( Hyun Bo Sim ),( Soo Yuhl Chae ),( Kyung Hea Park ),( Hyun Wuk Cha ),( Weon Ju Lee ),( Seok Jong Lee ),( Do Won Kim ),( Yong Hyun Jang ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.1
Reactions to a bee sting ranges from mild erythema to severe anaphylactic reactions. Occasionally, a sting may be retained in the skin and a foreign body reaction to the sting may persist. In traditional Korean medicine, bee sting therapy applies a bee sting directly into a lesion to treat various diseases. Although, some cases about foreign body reaction induced by bee sting were reported, there is no report showing bee sting in biopsy specimens. A 50-year-old woman presented mild pruritic grouped papules on both lip angles for 7 months. She had suffered from recurrent herpes simplex. As a treatment, multiple bee stings had been applied on the the skin lesions several months before. Interestingly, we found apparatuses suspected to be retained stings of bees, which were showed as yellow sticks with central cavity filled with eosinophilic venom in the biopsy specimen. The retained apparatuses were surrounded by hair follicle-like structure and a granulomatous inflammatory cell infiltrate. In H&E staining, that apparatuses were consistent with bee stings. Cutaneous reactions induced by long-standing retention of bee stings in the tissues may cause some difficulties in diagnosis, because of nonspecific, neoplasm-like changes in clinical and histopathological examination. Herein, we report an interesting case of a foreign body reaction induced by retained bee stings, demonstrated in comparison with live bee stings.
A Patient with Guillain-Barre Syndrome Treated with Combined Korean Medicine Treatments
Cha, Hyun Ji,Kim, Beom Seok,Lee, Ye Ji,Kim, Hyo Bin,Sung, Ki Jung,Lee, Young Rok,Kim, Jin Youp,Kim, Eun Seok,Jeon, Ju Hyun,Kim, Young Il Korean AcupunctureMoxibustion Medicine Society 2021 대한침구의학회지 Vol.38 No.2
A patient diagnosed with Guillain-Barre syndrome (GBS) suffering from numbness in the toes and fingers, paralysis in the face, and back pain received intravenous immunoglobulin on December 28, 2019. Without an improvement in symptoms the patient was admitted to a Korean medicine hospital on January 1, 2020 to receive combined Korean medicine treatment including herbal medicine (Sipjeondaebo-tanggami and Hyangbujasunkipalmul-tang), acupuncture treatment, moxibustion, cupping treatment, and physical therapy. Treatment was administered over 51 days, of which 17 days were during hospitalization. Paralysis of facial muscle, and numbness in fingers and toes were evaluated using the Yanagihara score and numeric rating scale (NRS) score, respectively. Facial paralysis improved (21 to 40 based on Yanagihara score) and paresthesia of the hands and feet disappeared (NRS score 6-7 to NRS score 0). There were no side effects or sequela. This study suggested combined Korean medicine treatment may be effective for the treatment of GBS.
Case Report : Active Sensitization of Para-tertiary-butylphenol after TRUE Test®
( Hyun Wuk Cha ),( Han Jin Jung ),( Hyun Jung Lim ),( Weon Ju Lee ),( Seok Jong Lee ),( Won Kim ) 대한피부과학회 2013 大韓皮膚科學會誌 Vol.51 No.5
Active sensitization of contact allergen is an uncommon complication of patch test. Para-tertiary-butylphenol (PTBP) is a component of neoprene-based adhesives used in glued leather goods such as shoes, handbags, belts and watchstraps. Contact allergy to PTBP is frequently seen when the patch test is performed. However, active sensitization to PTBP after the patch test is rare. A 23-year-old female patient came to our clinic with a brownish hyperpigmented patch on the belt position of her belly. Pruritic erythematous papules and vesicles developed on the abdomen when she wore new pants 4 months ago. Under the clinical diagnosis of allergic contact dermatitis, the patient was patch tested with the Thin-layer Rapid Use Epicutaneous Test (TRUE Test®). The result showed strong positive reaction to nickel sulphate and thiomersal both on day 2 and 3 after application. Twenty-nine days after the test, the patient noticed pruritus on the TRUE Test® area. Thirty-four days after the test, an erythematous square-shaped plaque studded with tiny vesicles developed at the PTBP patch test site. This strongly suggests that the reaction to PTBP is occurred. She was diagnosed with an active sensitization to PTBP. We report a rare and interesting case of active sensitization to PTBP after TRUE Test®.
Cha, Byung-Hyun,Kim, Jae-Hwan,Kang, Sun-Woong,Do, Hyun-Jin,Jang, Ju-Woong,Choi, Yon Rak,Park, Hansoo,Kim, Byung-Soo,Lee, Soo-Hong Pergamon Press ; Elsevier Science Ltd ; Elsevier S 2013 Cell transplantation Vol.22 No.9
<P>Articular cartilage, when damaged by degenerative disease or trauma, has limited ability for self-repair. Recently, many trials have demonstrated that gene therapy combined with tissue engineering techniques would be a promising approach for cartilage regeneration. Bone morphogenetic protein 2 (BMP-2) is an important signal for upregulation of osteogenesis and chondrogenesis of stem cells. Sex-determining region Y box gene 9 (SOX-9) has also been reported as one of the key transcription factors for chondrogenesis. We hypothesized that codelivery of BMP-2 and SOX-9 genes would result in improved efficiency of recovery of normal chondrogenic properties in dedifferentiated chondrocytes. To this aim, we constructed a bicistronic vector encoding the BMP-2 and SOX-9 genes linked to the 'self-cleaving' 2A peptide sequence. After gene delivery to dedifferentiated chondrocytes using a microporator transfection system, we confirmed over 65% delivery efficiency of the BMP-2 and SOX-9 genes. According to RT-PCR analysis and Alcian blue staining, simultaneous delivery of BMP-2/SOX-9 resulted in significantly increased expression of chondrogenesis-related markers (type II collagen and aggrecan) and GAG matrix formation compared with individual delivery of the BMP-2 or SOX-9 gene. Six weeks after in vivo transplantation, BMP-2/SOX-9 genes also showed a significant increase in cartilage formation compared with the BMP-2 or SOX-9 gene. These results demonstrate that codelivery of two chondrogenic lineage-determining genes can enhance normal chondrogenic properties of dedifferentiated chondrocytes followed by improved cartilage formation.</P>
Hyun Ju Cha,Won Sik Eum,Gi Soo Youn,Jung Hwan Park,Hyeon Ji Yeo,Eun Ji Yeo,Hyun Jung Kwon,Lee Re Lee,Na Yeon Kim,Su Yeon Kwon,Yong-Jun Cho,Sung-Woo Cho,Oh-Shin Kwon,Eun Jeong Sohn,Dae Won Kim,Duk-Soo 생화학분자생물학회 2023 BMB Reports Vol.56 No.4
Thioredoxin-like protein 1 (TXNL1), one of the thioredoxin superfamilyknown as redox-regulator, plays an essential in maintainingcell survival via various antioxidant and anti-apoptoticmechanisms. It is well known that relationship between ischemiaand oxidative stress, however, the role of TXNL1 protein inischemic damage has not been fully investigated. In the presentstudy, we aimed to determine the protective role of TXNL1against on ischemic injury in vitro and in vivo using cellpermeable Tat-TXNL1 fusion protein. Transduced Tat-TXNL1inhibited ROS production and cell death in H2O2-exposedhippocampal neuronal (HT-22) cells and modulated MAPKsand Akt activation, and pro-apoptotic protein expression levelsin the cells. In an ischemia animal model, Tat-TXNL1 markedlydecreased hippocampal neuronal cell death and the activationof astrocytes and microglia. These findings indicate thatcell permeable Tat-TXNL1 protects against oxidative stress invitro and in vivo ischemic animal model. Therefore, we suggestTat-TXNL1 can be a potential therapeutic protein for ischemicinjury.