데스크탑 밀링머신의 고속 스핀들 설계 해석

장성현,황현영,정우영,홍정표,최영휴 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

During a decade, there are many researches on microfactory which is the miniature, flexible, and efficient manufacturing system for the micro/meso scale machining device. Moreover many micro machine tool has developed in Japan, U.S., Europe, and Korea. Already we are developing a desktop milling machine with 380×450×450 ㎣ machine size for microfactory or BT (Bio technology) factory. In this study, we carried out the design analysis of a high speed spindle system for our desktop milling machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, we obtained some analyzed dynamic characteristics of a spindle system, such as natural frequency, whirl frequency, critical speed, and harmonic response.

노인의 팔 굽힘/폄 저항 운동 시 하중 증가에 따른 근육의 활성도 및 기여도 분석

김현동(Hyun Dong Kim),황성재(Sungjae Hwang),손종상(Jongsang Son),김한성(Han Sung Kim),김영호(Young Ho Kim) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4

The purpose of this study was to assess activation and contribution of muscles of the elderly according to increased loading during the arm flexion extension resistance exercise. Surface electromyographic signals were acquired from biceps brachii, triceps brachii, deltoid posterior, pectoralis major and latissimmus dorsi to determine the difference of the activation of specific muscles between the elderly and young. Five elderly and five young males with no musculoskeletal disease volunteered for the study. Electromyographic activities in the muscles were measured during resistance exercise and normalized to the maximum EMG activity recorded in the maximal voluntary static contraction (MVC). Against the increased loading during arm flexion/extension resistance exercises, the young uses muscles evenly but the elderly uses one specific muscle frequently. Contribution of triceps brachii during extension and deltoid posterior during flexion was principal in the elderly.

Increased 11β-hydroxysteroid dehydrogenase type 1 contributes to barrier dysfunction in aged skin

( Beom Jun Kim ),( Noo Ri Lee ),( Chung Hyeok Lee ),( Young Bin Lee ),( Solam Lee ),( Hyun Jee Hwang ),( Eunjung Kim ),( Eung Ho Choi ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2

Background: 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) converts inactive cortisone into cortisol, an active form, and is expressed by several tissues including the skin. Excessive active glucocorticoid (GC) deteriorates skin barrier function. Objectives: To find out if 11β-HSD1 affects on the barrier function in aged skin. Methods: We have performed human and in vivo studies. We measured cortisol in stratum corneum (SC) and oral epithelium of the elderly and young. Hairless mice were used for 11β-HSD1 immunohistochemistry staining of skin and measuring skin barrier function and serum cytokines. 11β-HSD1 knock-out (KO) mice and its wild-type were used for measuring lipid synthesis related enzyme. Results: Cortisol levels were elevated in SC and oral epithelium of the elderly rather than young. The 11β -HSD1 expression was increased in immunohistochemistry stain of aged mice skin. Aged mice showed decreased transepidermal water loss (TEWL) and SC hydration, and increased SC integrity than young. Serum inflammatory cytokines including interleukin-1α, -4, -10, -31 and tumor necrosis factor-α were increased in aged mice than young. The expressions of lipid synthesis related enzymes in epidermis were elevated in KO mice and topical 11β -HSD1 inhibitor applied mice. Conclusion: 11β-HSD1 expression is elevated in aged skin. It increases active GC and then deteriorates skin barrier function.

GIS를 활용한 초등 사회과 지리교육시스템의 개발

황홍섭,남영현 부산교육대학교 교육대학원 2002 논문집 Vol.4 No.-

The purpose of this study is to develop geographic education system(GES) by geographic information system(GIS) in elementary social studies. GES which is developed can make learners construct a meaningful knowledge. The development tool for GIS is MapObject LT 2 and Delphi Enterprise 5.0 as GIS software, and the edited is Auto CAD, Flash, Photo Shop, etc.. This system is divided into 5 parts : that is, ① What is a map? ② digital map that is, Seoul and Busan metropolitan city map, Korean peninsular map, world map, ③ map-maker ,④ report-maker ⑤ game. This system can make learners get more effectively than existing text-based learning because this system offers various data types such as digital map and image map, sound, image and video in each learning screen. Especially, this system maximize learning effectiveness through interaction with learners.

한국 재래 나물콩 품종 및 계통의 콩나물 특성

황영현,이정동,조호영,권택화,정연신 慶北大學校農業科學技術硏究所 2002 慶北大農學誌 Vol.20 No.-

우수한 특성을 가진 나물콩 품종 육성을 위하여 국내 재래 나물콩 계통의 콩나물 특성을 분석한 결과는 다음과 같다. 1. 공시된 301품종 및 계통의 콩나물 전체길이의 범위는 9.5∼23.0cm, 하배축 길이는 5.9∼15.1cm, 뿌리 길이는 3.2∼9.2cm로 다양한 변이를 보였고, 수율에서도 121∼695%로 다양하게 분포하고 있다. 2. 공시된 301품종 및 계통의 종피색에 따른 콩나물 수율은 혼색종피종에서 409%로 가장 높게 나타났고, 백립중에 따른 콩나물 수율은 소립종일수록 높은 경향이었으며, 잔뿌리수는 흑색종피종과 갈색 종피종에서 현저히 적었다. 3. 콩나물 길이와 전체길이에 대한 뿌리길이의 비율, 수율을 기준으로 한 공시품종 및 계통들의 분포에서 장려품종보다 우수한 특성을 가지는 다수의 재래계통이 분포하고 있었다. 4. 콩나물 하배축의 색도는 백색도(L값)에서 장려품종이 재래계통에 비해 백색에 더 가까웠고, 적색도(a값)와 황색도(c값)는 장려품종보다 재래계통에서 높은 경향이었다. To develop good soybean varieties for sprouts. 285 indigenous lines and 16 recommending varieties were evaluated by the sprout and agronomic characteristics. The range of whole length, hypocotyl length, root length, and yield rate of sprouts was 9.5~23.0cm, 5.9~15.1cm, 3.2~9.2cm, and 121~695%, respectively. Yield rate of sprouts was the highest, 409%, in the lines of mixed seed coat color. At the same time, it was reversely proportional to seed weight : the smaller the seed weight, the higher the yield rate as in all other reports. The number of roots was significantly fewer in the lines of the black and the green seed coat color than others. Based on whole length, rate of root length, and yield rate of sprouts, many indigenous lines were evaluated much better than recommending varieties. In the hypocotyl color of sprouts, the brightness was higher in improved variety than indigenous lines but vice versa in redness and yellowness in general.

색상 측정 기기를 이용한 복합레진 적층 수복과 단일 수복의 색상 비교 분석

송영상,김자현,이빈나,장지현,장훈상,황윤찬,오원만,황인남 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.2

Objectives: This study analyzed the difference in color caused by different thickness in enamel layer of composite resins when applied with single and layering placement technique, and evaluated if the results agreed with the shade guide from the manufacturers to verify reliability of the color matching process of the manufacturers. Materials and Methods: For single composite resin samples, 6 mm diameter and 4 mm thickness cylindrical samples were fabricated using Ceram-X mono (DENTSPLY DeTrey) and CIE L*a*b* values were measured with spectrophotometer. Same process was done for layering compositie resin samples, making 3 dentinal shade samples, 4 mm thickness, for each shade using Ceram-X duo (DENTSPLY DeTrey) and enamel shade resins were layered in 2 mm thickness and CIE L*a*b* values were measured. These samples were ground to 0.2 mm thickness each time, and CIE L*a*b* values were measured to 1 mm thickness of enamel shade resin. Results: Color difference (△E*) between single and layering composite resin was 1.37 minimum and 10.53 maximum when layering thicknesses were between 1 mm and 2 mm and 6 out of 10 same shade groups suggested by manufacturer showed remarkable color difference at anythickness (△E* > 3.3). Conclusion: When using Ceram-X mono and duo for composite resin restoration, following the manufacturer's instructions for chossing the shade is not appropriate, and more accurate information for Ceram-X duo is needed on the variation and expression of the shades depending on the thickness of the enamel. (Restor Dent Endod 2012;37(2):84-89)

전기 화상 환자의 수술 전 평가,고압손상과 저압손상 비교

황정원,이정기,전영태,강종만,오용석,노규정,김현철 대한정맥마취학회 2004 정맥마취 Vol.8 No.1

C_3 및 C_7위치에 치환된 새로운 세파로스포린 化合物의 合成과 抗菌活性(Ⅰ)

황화영,하재천,김영수,고옥현,강형룡 조선대학교 약학연구소 1994 藥學硏究誌 Vol.16 No.1

The synthesis and antimicrobial activity of cephalosporin having (Z)-2-(2-aminothiazol-4-yl)-2-trityloxyiminoacetamido group and 5-(2-chlorophenyl)-4-phenyl-4H-1, 2, 4-triazol-3-thiomethyl group on the C_3 and C_7 position of the cephem ring, respectively are descrived. This compound was tested for antimicrobial activity in vitro against Candida albicans ATCC 10231, Bacillus subtilis ATCC 6633, Micrococcus luteus ATCC 9341, Staphylococcus aureus ATCC 6538P, Mycobacterium phlei IIP-IPH, Escherichia coli KCTC 1039, Escherichia coli ESS, Klebisiella pneumoniae KCTC 1560, Salmonella typhymurium TV-119, Pseudomonas aeruginosa IFO 13130. The antimicrobial activity of synthetic compound was better as compare with cefotaxime and cefazoline against Micrococcus luteus ATCC 9341 & Escherichia coli KCTC ESS.

부산시 사회지역특성에 관한 연구

황영우,윤철현 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2

Social Area Analysis is valuable method to understand urban land use pattern by there residents. The result of this study using factor and cluster analyses is similar to the our common understanding on Pusan situations. Puasn can be divided 9 homogeneous regions through this study. The types of Pusan land use pattern cannot be fitted to Concentric Zone Theory, Sector Theory and Multiple Nuclei Theory like western cities. But the social determinants - invasion and succession, concentration and deconcentration, centralized decentralization system- were discovered partly in Pusan. The economic and public determinants have to be considered with complexity for the much deeper understanding on Pusan land use pattern.

급성 골수성 백혈병 환자에서 관해 유도 항암 화학요법 후 발생한 베르니케 뇌증

황진원,정재현,서광원,최병진,송영진,김종윤,이은지,임홍규,이상민 인제대학교 2009 仁濟醫學 Vol.30 No.-

Wernicke's encephalopathy is characterized by the triad of ocular symptoms, ataxia, and mental confusion and neuropsychiatric condition generally caused by acute thiamine deficiency. Although it is common in the severe alcoholics, several other causes also have been identified, such as total parenteral nutrition (TPN) use, hyperemesis gravidarum, anorexia nervosa, hemodialysis, uremia, and acquired immunodeficiency syndrome(AIDS). Chemotherapy in patient with malignanacy and long term total parenteral nutrition following bone marrow transplantation are related with Wernicke's encephalopathy. A 48-year-old woman had been treated with Daunorubicin and Cytarabine for remission induction chemotherapy of acute myeloblastic leukemia and intravenous hyperalimentation due to persistent hematochezia and ileus caused by infiltration of leukemic cell in terminal ileum. She suddenly complained of diplopia, tremor, and mental confusion at 32th day after chemotherapy and generalized tonic-clonic seizure at 34th day after chemotherapy. The diagnosis of Wernicke's encephalopathy was made with clinical presentations and brain MRI. Brain MR T2-weighted & Flair image revealed a high signal intensity lesions bilaterally at the medial thalamus and peri-acueductal grey matter of the midbrain. The patient was successfully treated with vitamin B1. We presented a case of acute Wernicke's encephalopathy developed after remission induction chemotherapy followed by intravenous hyperalirnentation in a patient with acute myeloblastic leukemia.