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이채봉,남경준 東西大學校 2001 동서논문집 Vol.7 No.-
This paper describes the study for the development of a 80㎜ low frequency sound speaker for the multimedia devices that has 80Hz basic resonance frequency and a pretty good ability to reproduce sounds efficiently in low frequency range even thought it is a compact sized speaker. This speaker has been changed by voice coil, magnet structures, diaphragm supporting structures and the shape of damper using theoretical simulation. As a result, the low frequency sound speaker has the characterization of a 80Hz basic resonance frequency.
안정시 항문괄약근압이 감소된 변비환자에서 배변장애의 특성
남준식 ( Nam Jun Sig ),정성애 ( Jeong Seong Ae ),심기남 ( Sim Gi Nam ),이한효 ( Lee Han Hyo ),염문선 ( Yeom Mun Seon ),김성은 ( Kim Seong Eun ),이정경 ( Lee Jeong Gyeong ),정혜경 ( Jeong Hye Gyeong ),김도영 ( Kim Do Yeong ),유권 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 항문내압검사에서 안정시 항문괄약근압이 비정상적으로 감소되었음에도불구하고 변실금이 아닌 변비를 호소하는 환자들에서 배변장애의 기전을 이해하기 위하여 항문직장의 생리학적 지표들을 분석하고자 하였다. <방법> 2001년 12월부터 2003년 7월까지 골반저 근실조로 진단된 37명의 환자를 대상으로 안정시 항문괄약근압이 감소된 군(이하 감소군) 22명과 정상군 15명을 구분하여 항문직장내압검사와 배변조영술 결과를 후향적으로 비교분석하였다. <결과> 감
Modified Metal–Organic Frameworks as Efficient Catalysts for Lignocellulosic Biomass Conversion
Jun Gyeong Lee,Eonu Nam,Kwangjin An 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
Biomass, a promising replacement for fossil fuels, can be used to produce eco-friendly liquid fuels and chemicals. Various studies are investigating catalysts for lignocellulosic biomass conversion to valuable chemicals and fuels. Metal?organic frameworks (MOFs) are important catalysts because of their well-ordered porous structures and large surface areas. Although MOFs can be applied directly, four modification strategies can be used to alter their catalytic properties and improve catalytic performance. In the first strategy, coordinatively unsaturated sites are created by changing the bonding state of the metal node. In the second approach, organic linkers with additional functional groups or active elements are used. In the third strategy, MOFs and other active elements are combined. In the final approach, MOFs are carbonized to produce carbon-supported metal catalysts. We review the applications of modified MOFs for the catalytic conversion of biomass derivatives and discuss the factors that contribute to their improved catalytic performance.
유한요소법과 경계요소법을 이용한 음향트랜스듀서의 음향방사 특성 해석
남효덕,서희돈,고영준,장호경 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2
The acoustic characteristics of the acoustic transducer was simulated by using the finite element method(FEM) and boundary element method(BEM). After meshing the inside closed boundary of the acoustic transducer, pressure gradients, isobaric lines, directivity characteristics and acoustic impedances were calculated by using the FEM and characteristics of 3-D free field sound pressure, directivity characteristics and radiation efficiency were simulated by using the BEM. It was shown that the usefulness of the design and the fabrication for the acoustic transducer from the results.
Nam, Kyoung-Hyup,Choi, Chang-Hwa,Lee, Jae-Il,Ko, Jun-Gyeong,Lee, Tae-Hong,Lee, Sang-Weon The Korean Neurosurgical Society 2010 Journal of Korean neurosurgical society Vol.48 No.2
Objective : To evaluate the clinical outcome of coil embolization for unruptured intracranial aneurysm (UIA) with oculomotor nerve palsy (ONP) compared with surgical clipping. Methods : A total of 19 patients presented with ONP caused by UIAs between Jan 2004 and June 2008. Ten patients underwent coil embolization and nine patients surgical clipping. The following parameters were retrospectively analyzed to evaluate the differences in clinical outcome observed in both coil embolization and surgical clipping : 1) gender, 2) age, 3) location of the aneurysm, 4) duration of the symptom, and 5) degree of ONP. Results : Following treatment, complete symptomatic recovery or partial relief from ONP was observed in 15 patients. Seven of the ten patients were treated by coil embolization, compared to eight of the nine patients treated by surgical clipping (p = 0.582). Patient's gender, age, location of the aneurysm, size of the aneurysm, duration of symptom, and degree of the ONP did not statistically correlate with recovery of symptoms between the two groups. No significant differences were observed in mean improvement time in either group (55 days in coil embolization and 60 days in surgical clipping). Conclusion : This study indicates that no significant differences were observed in the clinical outcome between coil embolization and surgical clipping techniques in the treatment of aneurysms causing ONP. Coil embolization seems to be more feasible and safe treatment modality for the relief and recovery of oculomotor nerve palsy.
( Nam Kyung Roh ),( Song Hee Han ),( Min Jung Kim ),( Gyeong-hun Park ),( Bark-lynn Lew ),( Eung Ho Choi ),( Hyun Chang Ko ),( Young Lip Park ),( Sang Wook Son ),( Young Jun Seo ),( Yang Won Lee ),( S 대한피부과학회 2016 Annals of Dermatology Vol.28 No.6
Background: Physicians can play a crucial role in the knowledge that patients have about a disease and its prognosis. Recently, patients with atopic dermatitis (AD) are increasingly turning from western medicine to oriental herbal medicine. However, their awareness of AD and attitude toward Western medicine and oriental herbal medicine clinics are scarcely reported. Objective: The aim of this study was to determine the understanding of AD among patients and their parents and to identify their awareness of and attitude toward Western medicine and oriental herbal medicine as treatments for AD. Methods: An online questionnaire was administered to 500 consenting respondents with AD (age, 16∼49 years) and parents of children with AD (age, 0∼15 years). Results: The mean percentage of correct answers to questions about AD was 52.54%. A parental history of AD was independently associated with higher respondent`s knowledge about the disease and its treatment. The satisfaction with treatment outcomes was highest among patients treated at private clinic of dermatology specialists (49.4%), while lowest among those treated at oriental herbal medicine clinics (38.4%). Many participants were aware that oriental herbal medicine requires a longer treatment period for a cure and does not burden the skin, while steroid phobia was seen in most of participants. Conclusion: Physicians need to educate AD patients and their parents about the disease and its treatment. Misconceptions for Western medicine and oriental herbal medicine among AD patients and parents should be corrected to improve their prognosis. (Ann Dermatol 28(6) 725∼732, 2016)
Biological Effects of Vinca minor extract;
Jun-Sub Kim,Il-Hwan Yu,Ji-Hye Joo,Gyeong Hoe Nam,Kyung-Hwan Jung,Young Soo Chung,Hyang-Yeol Lee 한국유화학회 2016 한국응용과학기술학회지 Vol.33 No.4
Vinca alkaloids from plant Vinca minor have been investigated for their effects of tyrosinase inhibition, stimulation of ROS generation and increasement of cell migration activity. The methanolic crude extract and the water-soluble fraction exhibited IC50 value of 3.1 mg/mL and 2.1 mg/mL. Vinca minor extract treatment significantly increased ROS levels in HaCaT cells, in a concentration-dependent manner. Treatments of Vinca minor extract led to increase wound closure when compared with non-treatment. Low dose (0.1% or 0.3%) of extracts have not significantly affected, compared with that in controls. By contrast, 0.5% extract have dramatic effect on wound healing activity of keratinocytes. Effects of Vinca minor extract in a filter-based cell mobility assay appear similar to that of wound closure assay, which suggests that the Vinca minor extract have wound healing effects on skin.