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SM20C 旋削時 加工條件 變化에 따른 칩 形狀에 관한 硏究
정태상,황광성,김명규,김길진,박영태 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
This study was to look for cutting conditions which are safe, comfortable and contributable to the increase in productivity at the time in turning. The shape of chips while turning have a strong effect on cutting processing. If chips fail to be well controlled, systematic cutting is not possible by revolution of chips entangled with workpiece or damage of tool edges, and this causes problems threatening the safety of the operator. This study is designed to identify conditions which chips effectively controlled and able to treat properly, and the results are as follows: 1. Feed rate, which determined the shape of chips, was found to have a stronger impact on the shape of resulting chips than any other cutting condition. 2. When feed rate was 0.25mm or over, controlled chips(coil spring type) were produced under whatever cutting conditions. 3. When feed rate was 0.25mm or over and depth of cut was 1.0mm, well-controlled shorter coil type chips were produced at every spindle speed, which implied they were the most suitable cutting conditions. 4. Feed rate 0.2mm was found to be an unstable section where coil spring and linear mixed type chips were produced together, and as feed rate decreased, more linear chips beyond control were produced. 5. At the same spindle speed, as the diameter of the material became bigger, controlled chips were produced only when the depth of cut was reduced, and vice versa under feed rate 0.2mm. 6. At the same feed rate, the lower spindle speed was, the more stable chips were produced.
Prenatal development toxicity study of zinc oxide nanoparticles in rats
Hong, Jeong-Sup,Park, Myeong-Kyu,Kim, Min-Seok,Lim, Jeong-Hyeon,Park, Gil-Jong,Maeng, Eun-Ho,Shin, Jae-Ho,Kim, Meyoung-Kon,Jeong, Jayoung,Park, Jin-A,Kim, Jong-Choon,Shin, Ho-Chul Dove Medical Press 2014 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.9 No.2
<P>This study investigated the potential adverse effects of zinc oxide nanoparticles ([ZnO<SUP>SM20(+)</SUP> NPs] zinc oxide nanoparticles, positively charged, 20 nm) on pregnant dams and embryo–fetal development after maternal exposure over the period of gestational days 5–19 with Sprague-Dawley rats. ZnO<SUP>SM20(+)</SUP> NPs were administered to pregnant rats by gavage at 0, 100, 200, and 400 mg/kg/day. All dams were subjected to a cesarean section on gestational day 20, and all of the fetuses were examined for external, visceral, and skeletal alterations. Toxicity in the dams manifested as significantly decreased body weight after administration of 400 mg/kg/day NPs; reduced food consumption after administration of 200 and 400 mg/kg/day NPs; and decreased liver weight and increased adrenal glands weight after administration of 400 mg/kg/day NPs. However, no treatment-related difference in: number of corpora lutea; number of implantation sites; implantation rate (%); resorption; dead fetuses; litter size; fetal deaths and placental weights; and sex ratio were observed between the groups. On the other hand, significant decreases between treatment groups and controls were seen for fetal weights after administration of 400 mg/kg/day NPs. Morphological examinations of the fetuses demonstrated significant differences in incidences of abnormalities in the group administered 400mg/kg/day. Meanwhile, no significant difference was found in the Zn content of fetal tissue between the control and high-dose groups. These results showed that oral doses for the study with 15-days repeated of ZnO<SUP>SM20(+)</SUP> NPs were maternotoxic in the 200 mg/kg/day group, and embryotoxic in the 400 mg/kg/day group.</P>
Isotretinoin을 복용하는 여드름 환자에서 γ-Linolenic Acid 병용요법이 건조증 예방과 여드름 병변에 미치는 영향
정명길 ( Myeong Gil Jeong ),김정은 ( Jeong Eun Kim ),안지영 ( Ji Young Ahn ),고주연 ( Joo Yeon Ko ),박미연 ( Mi Youn Park ),노영석 ( Young Suck Ro ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.11
Background: Oral isotretinoin is an effective treatment modality for acne, but this agent may cause dryness of the skin and mucous membrane. Gamma-linolenic acid (GLA) has been known to improve skin moisture and reduce transepidermal water loss (TEWL). It is also known to have anti-inflammatory effects and to inhibit 5-alpha reductase. Objective: This study was performed to evaluate the clinical efficacy of GLA in the prevention of xerosis and improvement of acne lesions after concomitant administration of isotretinoin. Methods: In this prospective study, 102 Korean acne patients were enrolled and randomized to receive isotretinoin either with or without GLA for 12 weeks. Comparing evaluations included skin hydration, TEWL, visual analogue scale (VAS) score for dryness of the lips and skin, number of acne lesions such as comedos, papules, and pustules, Korean acne grading system (KAGS) grade, and patient satisfaction regarding treatment. Results: The decrease of skin hydration and increase of the TEWL of the lips and cheek were less definite in the experimental group than those of the control group. VAS score for dryness of the lips and skin was significantly lower in the experimental group compared with the control group. The number of acne lesions decreased in both groups; only the numbers of papules were different between the two groups. The decrease of the KAGS grade was more definite in the experimental group than that in the control group. Conclusion: This study suggests that GLA could be used effectively for the improvement of acne lesions as well as for the prevention of xerosis. (Korean J Dermatol 2013;51(11):863∼870)
정명길 ( Myeong Gil Jeong ),오영재 ( Young Jae Oh ),최원준 ( Won Jun Choi ),주민숙 ( Mihn Sook Jue ),고주연 ( Joo Yeon Ko ),노영석 ( Young Suck Ro ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.4
Kikuchi`s disease (KD), histiocytic necrotizing lymphadenitis, is a rare self-limited lymphadenopathy, which usually affects young women. KD has been reported to precede, coexist with or follow the diagnosis of other entities, such as systemic lupus erythematosus (SLE), adult-onset Still`s disease, Hashimoto`s disease, and viral infections. In a few cases, KD is associated with cutaneous lupus erythematosus (CLE), without systemic involvement. Herein, we report the first Korean case of KD associated with lupus erythematous profundus in a 9-year-old boy. (Korean J Dermatol 2012;50(4):341∼345)
정명길 ( Myeong Gil Jeong ),노현수 ( Hyun Soo Roh ),이정우 ( Jung Woo Lee ),박경태 ( Kyoung Tae Park ),김정수 ( Joung Soo Kim ),유희준 ( Hee Joon Yu ) 대한피부과학회 2011 大韓皮膚科學會誌 Vol.49 No.6
Depigmented halos surrounding cutaneous lesions have been the common description of many diseases, including benign melanocytic nevus, acquired blue nevi, malignant melanoma and neurofibromatosis. To the best of our knowledge, a halo around seborrheic keratosis has not been reported in the Korean dermatologic literature, and only two cases have been described abroad. Though vitiligo is known to be frequently associated with this halo phenomenon, the exact etiopathogenesis of vitiligo and the halo phenomenon is still unknown. Herein, we report on a case of halo seborrheic keratosis in a patient with vitiligo. (Korean J Dermatol 2011;49(6):554∼556)
( Gil Myeong Seong ),( Jae Chun Lee ),( Jong Hoo Lee ),( Jeong Hong Kim ),( Mi Ok Kim ) 대한결핵 및 호흡기학회 2014 Tuberculosis and Respiratory Diseases Vol.76 No.4
Background: Mycobacterial identification in active pulmonary tuberculosis (APTB) is confirmative, even though successful rates using self-expectorated sputum are limited. Sputum specimens collected by hypertonic saline nebulization showed higher bacteriologic diagnostic sensitivities over those of self-expectoration, mostly studied in smear-negative or sputum-scarce patients. The efficacy of induced sputum was rarely assessed in real clinical settings. Methods: A prospective randomized case-control study was performed in one hospital. The subjects highly suspicious of APTB were asked to provide 3 pairs of sputum specimens in 3 consecutive days. The first pairs of the specimens were obtained either by self-expectoration (ES) from the next day of the visit or sputum induction with 7% saline nebulization in clinic (SI), and the other specimens were collected in the same way. The samples were tested in microscopy, culture, and polymerase chain reaction (PCR). The outcomes of the bacteriological diagnosis were compared. Results: Seventy six patients were assigned to either ES (38 subjects, median age of 51, 65.8% male) or SI (38 subjects, median age of 55, 52.6% male). APTB was clinically confirmed in 51 patients (70.8%), 27 in ES and 24 in SI. Among the APTB, more adequate specimens were collected from SI (41/65, 63.1%) than ES (34/80, 42.5%) (p=0.01). Bacteriological confirmation was achieved in 14 (58.3%) patients in SI, and 13 (48.1%) in ES (p=0.46). In the same-day bacteriological diagnosis with microscopy and PCR, there were positive results for 9 patients (37.5%) in SI and 7 patients (25.9%) in ES (p=0.37). Conclusion: Sputum induction improves sputum specimen adequacy. It may be useful for the same-day bacteriological diagnosis with microscopic examination and PCR.
갯기름나물 경엽생산을 위한 적정 피복재료 선발 및 제초효과 구명
Myeong Seok Kim,Ho Sub An,Gil Ja Kim,Dong Kwan Kim,Jin Gyung Choi,Sook Jae Lee,Heung Gyu Park,Hae Ryoung Shin,Seong Il Kim,Young Guk Kim,Young Sup Ahn,Seon Woo Cha,Chan Sik Jeong 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05
Background : The purpose of this study was to evaluate methods to high quality medicinal vegetables, thereby increasing farm income. This study investigated the effects of different covering material and weed eliminating on stable foliage production in Peucedanum japonicum Thunberg. Methods and Results : method of weed elimination with covering material were conducted under four condition compose to Non covering(4~6 times by manual weed control), Barley straw cutting covered with 700㎏․10 a−1, Rice straw cutting covered with 500㎏․10 a−1, Rice husks covered with 1,000㎏․10 a−1. Fermented mixed oil cake compost applied at 380㎏․10 a−1, 60% of basal fertilizer in March 14, 40% of top dressing were four times application in April 14 ~July 15. Sowing dates were March 25, 2015. Plants were spaced 15 ㎝ apart in rows 15 ㎝ apart with open cultivation. Conclusions : Rice husks covering < Barley straw covering < Barley straw covering cultivation this order, aerial part as a result were plenty amount of growth. Weed the rates was 12 to 29% lower incidence. Green leaf yields is uncovering control plot (915 kg․10 a−1) compared to 2% from covering rice husks, barley straw and rice straw covering increased to 18%, 20%, respectively.