조향장치용 인텀 샤프트 설계변수 평가를 위한 수치적 연구

강영수(Young Su Kang),두민수(Min Soo Doo),김정(Young Su Kang),강범수(Beom Soo Kang),송우진(Woo Jin Song) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.12

건강한 젊은 성인에서 액상 물질 한 모금 삼킴량의 측정

김수익 ( Su Ik Kim ),강지훈 ( Ji Hun Kang ),이동익 ( Dong Ik Lee ),조정열 ( Jeong Ryul Jo ),김형준 ( Hyung Jun Kim ),이재백 ( Jae Baek Lee ),진영호 ( Young Ho Jin ),정태오 ( Tae Oh Jeong ),윤재철 ( Jae Chol Yoon ) 대한임상독성학회 2013 대한임상독성학회지 Vol.11 No.2

Purpose: The aim of this study is to estimate one mouthful volume in a single swallow and average volume per swallow (AVS) in multiple swallows in the situation of toxic liquid poisoning. Methods: Thirty five men and 35 women were included in this study. Each subject was asked to drink one swallow and three consecutive swallows from bottle containing water and a bottle containing saline separately. We calculated one mouthful volume in a single swallow and AVS in three swallows. One mouthful volume and AVS were compared according to sex and content, respectively. One mouthful volume of water and saline was then compared with AVS of each. Results: Sixty seven adults(34 men; 26.9±3.2 years, 33 women; 25.6±2.4 years) completed the study. Men had larger one mouthful volume of water(49.1±19.9 ml vs 39.7±10.2 ml, p=0.02) and saline(20.7±10.9 ml vs 14.0±4.6 ml, p=0.004) and AVS of water(28.5±11.9 ml vs 21.5±5.9 ml, p=0.004) and saline(11.9±6.3 ml vs 7.9±2.0 ml, p=0.001) than women. One mouthful volume and AVS of saline swallow were lower than those of water swallow. AVS of three consecutive swallows was lower than one mouthful volume in water and saline swallow. Conclusion: We suggest that one mouthful volume in a single swallow is 21 ml in men and 14 ml in women and AVS in multiple swallows is 12 ml in men and 8 ml in women. AVS in multiple swallows is two-threefold lower than reference values(20~30 ml) commonly used in poisoning study.

레이저를 이용한 세라믹 가공 공정변수의 연구 (Ⅱ)

김종도(Jong-Do Kim),이수진(Su-Jin Lee),서정(Jeong Suh),강태영(Tae-Young Kang),이상수(Sang-Su Lee) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-

Hairless 마우스에서 천궁 열수추출물의 피부장벽 및 염증 완화 효과

김수은 ( Su Eun Kim ),강성례 ( Sung Rye Kang ),박미순 ( Mi Soon Park ),김영철 ( Young Chul Kim ) 대한미용학회 2011 대한미용학회지 Vol.7 No.2

To investigate the alleviative effects of Cnidium officinale water extract (COWE) on inflammation and skin barrier damage, both the irradiation of UVB and the application of squalene monohydroperoxide (Sq-OOH) to the backs of hairless mice were performed for 4 weeks. And at the same time experimental materials were applied topically. The skin erythema indices for the positive control (PC, 0.01% retinoic acid) and experimental (E, COWE) groups were lower than that of the control (C) group. Whereas both the lipid and water capacities for the PC and E groups were higher than those of the C group. Epidermis and dermis of the C group were remarkably thickened in comparison with the PC and E groups. Relatively much less number of inflammatory cells, including lymphocytes and neutrophils were found in dermis of the PC and E groups compared with the C group. Lipid lamellae of the C group were broken severely, showing an irregular arrangement and lipid content was much reduced. Whereas those of the PC and E groups were almost intact with a regular arrangement, that were similar to that of the N group. Taken the results all together, it was confirmed that COWE could be effective natural herbal material for the alleviation of inflammation and skin barrier damage in hairless mice skin that were induced by UVB irradiation and Sq-OOH application.

갈치 끌낚시 어구의 수심변화 및 어획량 시험

김문관 ( Mun-kwan Kim ),박수현 ( Su-hyeon Park ),강형철 ( Hyeong-cheol Kang ),박용석 ( Yong-seok Park ),안영일 ( Young-il An ),이춘우 ( Chun-woo Lee ),박수봉 ( Su-bong Park ) 한국어업기술학회 2018 수산해양기술연구 Vol.54 No.2

In this study, we tested Japanese trolling lines in the Jeju fishery. This fishery simulates the natural marine environment with many seabed rocks, and has been redesigned and manufactured it to be suitable for the Jeju fishery. In order to ensure that the trolling lines were deployed at the inhabitation depth of hairtails, the conditions required for the fishing gear to reach the target depth were determined for use during the experiment. The experimental test fishing was conducted at the depth of 120 m water in front of Jeju Seongsanpo and in the offshore area of Jeju Hanlim. The fishing gear used in the test fishing is currently used in a variety of field operations in Japan. However, several problems were identified, such as twisting of the line during its deployment and excessive sinking of the main line. The fishing gear was, therefore, redesigned and manufactured to be more suitable for the Jeju fishery environment. For the fishing gear to accurately reach the target depth, depth loggers were installed at the starting point of the main line and at the 250 m and 340 m points of the line. Depth and time were recorded every 10 seconds. According to the daytime positioning of hairtails in the lower water column, the target depth of the fishing gear was set at 100-110 m, which was 10-20 m above the sea floor. At a speed of 1.9 knots and with a 9 kg sinker attached, the main fishing line was deployed and catch yields at depths of 100 m, 150 m and 180 m were recorded and analyzed. When the 180 m main line was fully deployed, the time for the hairtail trolling lines to arrive at the appropriate configuration had to be 5 minutes. At this time, the depth of the fishing gear was 16-23 m above the sea floor, in accordance with the depths at which the hairtails were during the day. In addition, in order to accurately place the fishing gear at the inhabitation water depth of hairtails, the experimental test fishing utilized the results of the depth testing that identified the conditions required for the fishing gear to reach the target depth, and the result was a catch of up to 97 kg a day.

질화규소 세라믹의 레이저 예열선삭에 관한 연구 (III) - SSN 및 HIPSN의 예열선삭시 절삭력 및 공구수명의 특성 -

김종도,이수진,강태영,서정,이제훈,Kim, Jong-Do,Lee, Su-Jin,Kang, Tae-Young,Suh, Jeong,Lee, Jae-Hoon 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.6

Generally, ceramic material is very difficult to machine due to high strength and hardness. However, ceramic material can be machined at high temperature by plastic flow as metallic material due to the deterioration of the grain boundary glassy phase. Recently, a new method was developed to execute cutting process with CBN cutting tool by local heating of surface with laser. There are various parameters in LAM because it is a complex process with laser treatment and machining. During laser assisted machining, high power results in reducing of cutting force and increasing tool life, but excessive power brings oxidation of the surface. The effect of laser power, feed rate, cutting depth and etc. were investigated on the life of cutting tool. Chips were observed to find out suitable machining conditions. Chips of SSN had more flow-types than HIPSN. It means SSN is easier to machining. The life of cutting tool was increased with increasing laser power and decreasing feed rate and cutting depth.

원형부와 확장부 길이가 팬형상 홀의 막냉각 효율에 미치는 영향 연구

김영서(Young Seo Kim),강민석(Min Seok Kang),곽재수(Jae Su Kwak) 한국유체기계학회 2021 한국유체기계학회 학술대회 논문집 Vol.2021 No.12

소형 추력기의 성능 개선을 위한 액체 추진제 주입기 최적 설계 및 추진제 거동 연구

김기로(Kiro Kim),김수겸(Su-Kyum Kim),변도영(Do-Young Byun),이세민(Se-Min Lee),정강수(Kang-Su Jung),박수형(Soo-Hyung Park),김성균(Sung-Kyun Kim),유명종(Myoung-Jong Yu) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.4

본 연구는 기존의 인젝터와 새로운 형태의 인젝터를 비교분석 함으로써 소형 추력기의 성농을 연구하였다. 기존의 인젝터는 볼록한 표면에 8개의 노즐로 구성되어 액체 추진제를 분사하는 형태로 제작되었다. 우리가 제안한 새로운 형태의 인젝터는 오목한 표면에 4, 5, 6, 8, 9개의 노즐로 구성된 충돌형 인젝터이다. 노즐의 구멍을 통해 분사되는 액체 추진제는 축 방향으로 한 점에서 부딪히게 설계되었으며, 이는 분사되는 액체 추진체의 입자를 더욱 세분화하여 사방으로 일정하게 분무할 수 있도록 하였다. 본 논문에서는 천산유체역학, 입자 유속계 및 고속 카메라를 이용하여 분무 가시화 및 인젝터의 성능을 연구하였다. This work studies the performance of an injector for a monopropellant thruster, comparing a conventional and new injector types. The conventional injector consists of 8 nozzles on a convex surface allowing the jet to be diverged. The new injector, we suggested, is an impinging type with nozzle holes on a concave surface. The fuel streams through the nozzle holes are collide at a point on an axial direction, which allow to atomize the liquid streams and to spray more uniformly along circular direction. The performance of the injectors is investigated by using computational fluid dynamics, particle image velocimetry and high speed camera visualization.

선주낙어구를 이용한 갈치 어획의 수직분포와 일주변화

김문관 ( Mun-kwan Kim ),박수현 ( Su-hyeon Park ),강형철 ( Hyeong-cheol Kang ),오태철 ( Tae-cheol Oh ),박용석 ( Yong-seok Park ),안영일 ( Young-il An ),김석종 ( Suk-jong Kim ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.2

To improve the efficiency of hairtail trolling, it is important to gain an accurate understanding of the distribution of fish based on their diurnal vertical migration patterns. This study evaluated the vertical distribution of hairtails through catch efficiency tests using vertical longlines. Five replicate tests of the efficiency were carried out on the eastern coast of Jeju Island from August to September 2016, from 11:00 AM to 03:00 PM in the daytime and 11:00 PM to 03:00 AM in the nighttime. The fishing gear was composed of 20 hooks per line set, numbered in order from the first hook near the surface to the last hook on the seabed. The depth of the first hook was 18 m, and that of the last hook was 86 m. Pacific saury was used as the baits. In total, 10 sets of fishing gear were used per trip. After fishing, we counted the hairtails at each numbered hook, which were summed up both by number and in aggregate. A total of 232 hairtails were caught using 2,000 hooks: 193 individuals at daytime and 39 at nighttime. The hook rate was 11.5% : 9.6% at daytime; 2.0% at nighttime. For both daytime and nighttime catches, there were variations in the hook rates at each numbered hook. In the daytime, a maximum of 28.5% catches occurred at hook number 18, followed by 21.4% at number 20, and 10.7% at number 17, accounting for 60.6% of the daytime hook rates. In the nighttime, a maximum of 23.0% catches occurred at hook number 1, followed by 15.3% at hook number 4 and 9, accounting for 53.6% of the nighttime hook rate. Based on the above results, hairtails are usually distributed in deeper region in daytime, whereas they occur near the surface in nighttime. Therefore, it is necessary to position trolling lines according to diurnal vertical distribution layers of hairtails for fishing efficiency.

동충하초 균사체로 발효시킨 백련잎차의 품질특성

김종숙(Jong-Suk Kim),왕수빈(Su-Bin Wang),강성구(Seong-Koo Kang),조영숙(Young-Sook Cho),박석규(Seok-Kyu Park) 한국식품영양과학회 2009 한국식품영양과학회지 Vol.38 No.5

눈꽃 동충하초 균사체를 이용한 백련잎 발효차와 비발효차의 열수와 에탄올 추출물에 대한 품질특성을 평가하기 위하여, 추출수율, 갈변도, 유리당, 유기산, 유리아미노산, 무기질의 함량을 조사하였고, 또한 수증기 증류법으로 백련잎차의 휘발성 성분을 동정하였다. 추출수율은 발효 및 비발효차 모두 열수 추출물이 에탄올 추출물보다 높았으며, 백련잎 발효차의 열수 추출용매에서 유의적으로 가장 높은 26.55%를 나타내었고(p<0.05), 갈변도는 흡광도로서 열수 추출물이 에탄올 추출물에 비하여 1.6배 이상으로 높은 값을 나타내었다. 총 유리당은 백련잎 발효차의 열수 추출물에서 43.4%로 가장 높은 함량을 나타내었으며, glucose 함량은 발효차의 열수 및 에탄올 추출물에서 각각 5.6배, 3.7배 유의적으로 증가되었다(p<0.05). 총 유기산은 861.9~4,704.8㎎% 범위로서 발효 백련잎차의 에탄올 추출물이 가장 높았으며, 그 중에는 succinic acid가 에탄올 추출물에서 유의적으로 가장 높았고(p<0.05), 백련잎 발효차는 비발효차의 경우와는 달리 acetic acid, malic acid, tartaric acid가 확인되었다. 총 유리아미노산은 건물 당 346.4~1,480.8 ㎎% 범위로서, 비발효 백련잎차의 열수 추출물이 가장 높은 함량을 나타내었다(p<0.05). 백련잎 발효차는 비발효차에 비하여 총 유리아미노산 함량이 감소하는 경향이었으며, 용매별로는 열수 추출물이 에탄올 추출물에 비하여 2.9배 유의적으로 높았고(p<0.05). 총 무기질은 비발효 및 발효차의 열수 추출물이 에탄올 추출물에 비하여 각각 2.1배, 1.7배 높았으며, 그 중에서는 발효차의 열수 추출물이 유의적으로 가장 높은 함량을 나타내었다(p<0.05). 휘발성 성분은 aldehyde류 11종, alcohol류 14종, ketone류 11종, hydrocarbone류 11종, acid류 12종으로 총 59개를 동정할 수가 있었으며, 특히 비발효차는 alcohol류, 발효차는 aldehyde류와 ketone류에서 서로 다른 휘발성분들이 확인되었다. Quality characteristics of white lotus leaf tea (LLT) fermented with or without mycelial Paecilomyces japonica were investigated. Extraction yield and browning index of hot water extract from non fermented and fermented LLTs were higher than those of ethanol extract (p<0.05). In all LLTs, nutritional components such as total free sugar, free amino acids and minerals of hot water extracts were higher than those of ethanol extracts except for total organic acids (p<0.05). Contents of total free sugar and organic acids were markedly increased through fermentation process of mycelial Paecilomyces japonica. in the same solvent extracts (p<0.05). Contents of most taste components of fermented LLT were increased by mycelial solid fermentation (p<0.05), but total free amino acids of two extracts were decreased in the range of 37.1~67.2% as compared to non-fermented LLT. Fifty-nine volatile compounds were identified by GC and GC-MS, including 11 aldehydes, 14 alcohols, 11 ketones, 11 hydrocarbones and 12 acids. Aldehyde and ketone compounds were more identified in fermented LLT than in non-fermented LLT being abundant alcohol compounds by simultaneous steam distillation and extraction. The most abundant compounds of LLT identified in this study were curcumene followed by 2,6-bis(1,1-dimethylethyl)-4-methyl-phenol and cyclohexen. Main compounds of fermented LLT were 2,6-bis(1,1-dimethylethyl)-4-methyl-phenol, butanoic acid, furfural, benzaldehyde, hexanoic acid and 2(3H)-furanone.