Al고압주조공법에서 사출슬리브 온도 조절을 통한 Chill layer의 최적 제어

박진영,김억수,박용호,박익민,Park, Jin-Young,Kim, Eok-Soo,Park, Yong-Ho,Park, Ik-Min 한국재료학회 2006 한국재료학회지 Vol.16 No.11

In this study, the effect of chill layers occurred in shot sleeve on the molten metal filling was analyzed through computer simulation. The behavior of chill layers with temperature variation of shot sleeve set from 200 to $280^{\circ}C$ was also investigated. The simulation results showed the chill layers set in the in-gates during the injection process change the main filling direction and cause turbulent flow pattern, resulting in porosities inside the castings. The amount of chill layers with the increasing temperature of shot sleeve was considerably reduced. Particularly, at the setting temperature of $280^{\circ}C$ by heat control unit, the biggest reduction in chill layers, excellent trimmed surface and the highest density were achieved, suggesting that as the optimal sleeve condition in aluminum high pressure diecasting, especially for highly complex parts like valve body.

진동 자극 유무에 따른 호흡 저항 훈련 시 폐 기능과 호흡근의 즉각적인 차이가 있을까?

박진영,김예슬,박현주,이명모,Park, Jin-Young,Kim, Ye-Seul,Park, Hyun-Ju,Lee, Myung-Mo 대한물리치료과학회 2018 대한물리치료과학회지 Vol.25 No.3

Purpose: The purpose of this study was to investigate the effect of whole body vibration combined breathing resistance on lung capacity and respiratory muscle and to suggest a mediation method for improvement of respiratory function and lung function in the future. Methods: This study was a preliminary study design of two groups of 54 healthy young adults who were randomly assigned to an experimental group (n=27) with core exercise combined with respiratory resistance and whole body vibration and a control group with respiratory resistance and core exercise (n=27). All interventions consisted of 6 core exercises every 40 seconds and rest for 20 seconds. To compare the effects of intervention, we measured spirometry and respiratory muscle strength. Results: Both the experimental group and the control group showed a significant increase in Forced vital capacity (FVC) and Maximum voluntary ventilation (MVV) (p<.05). However, FEV1 and FEV1% were significantly increase only in the experimental group (p<.05). FVC, FEV1%, Maximum Inspiratory Pressure (MIP), Maximum Expiratory Pressure (MEP) showed more significant increase in the experimental group than the control group. Conclusion: These findings indicate that whole-body vibration combined breathing resistance is an effective intervention for people, with FVC, FEV1%, MIP, MEP increase.

퉁퉁마디를 가해하는 퉁퉁마디뿔나방 Scrobipalpa salinella (Zeller) (나비목, 뿔나방과)의 재발견 및 피해

박진영,박규택,Park, Jin-Young,Park, Kyu-Tek 한국응용곤충학회 2008 한국응용곤충학회지 Vol.47 No.4

전남 신안군의 퉁퉁마디 재배지에서 대 발생하여 피해를 초래한 해충이 뿔나방과의 Scrobipalpa salinella (Zeller)로 확인되었다. 본 종은 Park & Ponomarenko (2006)에 의해 국내에서 처음 보고된 바 있다. 그러나 동정이 어려운 암컷 한 개체를 대상으로 하였으며, 염생식물이 없는 산간지역에서 발견된 점 등으로 분포에 대한 의문점이 상존해 왔었으나 금번 조사결과로 국내 분포가 재 확인되었다. 종의 분류동정을 위한 성충과 생식기의 사진 제공과 함께 유충의 발생 및 피해에 대해 조사된 내용을 기술하였다. In a cultivated field of Salicornia europae in the Jeonam Province, Korea, Scrobipalpa salinella (Lepidoptera, Gelechiidae) which feeds and leads to a serious damage was found. The discovery of this species is to reconfirm its distribution in Korea because the first report by Park and Ponomarenko (2006) was based on a single female and it was collected in a montane area far from seaside where its host plants, halophytes, are planted. For identification, photos of imago and genitalia are given, and the damage by larvae on Salicornia europae are noted.

국부가압 다이캐스팅 공정에서 3차원 유동 및 응고해석을 통한 자동차 변속기 Gear Housing의 주조방안 설계 최적화

박진영,김억수,박용호,박익민,Park, Jin-Young,Kim, Eok-Soo,Park, Yong-Ho,Park, Ik-Min 한국재료학회 2006 한국재료학회지 Vol.16 No.11

In the partial squeeze casting process, the filling behavior of liquid metal and solidification pattern in thick area have significant influence on the quality of casting products and die life. For the optimal casting design of automobile transmission gear housing, various analyses were performed in this study by using computer simulation code, MAGMAsoft and the simulation results were compared and analyzed with experimental results. By air pressure criteria, internal porosities caused by air entrap during the mold filling were predicted and reduced remarkably by modification of gating system. Also, optimal squeeze-time lag to apply partial squeeze pin in thick area was calculated and the castings was free from shrinkage defects with the result of solidification analysis. Consequently, casting design for automobile transmission gear housing was optimized and approved by Computer Tomography.

아동기에 주의력결핍 과잉행동증상을 경험한 성인의 정신병리와 기질 성격 요인

송열매(Yul-Mai Song),이건석(Kounseok Lee),한덕현(Doug Hyun Han),이영식(Young Sik Lee),민경준(Kyung Joon Min),박진영(Jin Young Park),김준원(Jun Won Kim) 대한소아청소년정신의학회 2013 소아청소년정신의학 Vol.24 No.4

Objectives:The objective of this study is to find out the differences in psychopathology, temperament, and character factors between young adults with and without childhood attention-deficit hyperactivity disorder (ADHD) symptoms. Methods:The subjects consisted of 314 university students (male=72, female=242) in Gongju. They were divided into childhood ADHD group (N=54) and normal group (N=260) to the Wender-Utah Rating Scale. Participants were assessed using Korean Adult ADHD Scale, Beck Depression Inventory-II, Beck Anxiety Inventory, Kimberly Young’s Internet Addiction Test, Barratt Impulsiveness Scale, Paranoia Scale, Korean-Schizotypal Ambivalence Scale, Lubben Social Network Scale, and Temperament and Character Inventory-Revised. Descriptive statistics, t-test, chi-square, spearman correlation, and stepwise multiple regression were applied to analyze the data. Results:Participants with childhood ADHD symptoms had high level of adult ADHD symptoms (p<.001), impulsiveness(p=.001), depression (p<.001), anxiety (p<.001), internet addiction (p<.001), paranoia tendency (p<.001) and low level of selfesteem (p<.001) compared to normal group. Self-directedness (p<.001) was lower, Harm avoidance (p=.001) and Self-transcendence (p=.029) were higher in the childhood ADHD group. In correlation and stepwise multiple regression, childhood ADHD symptoms were significantly associated with cooperativeness (r=-0.515 and β=-0.547, p<.001 respectively). Conclusion:This result showed that young adults with childhood ADHD symptoms had various forms of psychopathology and childhood ADHD symptoms were influenced by character such as cooperativeness. Therefore, more thorough evaluation regarding childhood ADHD symptoms is needed.

실패한 견관절 불안정증의 봉합술에 대한 재수술

박진영,박홍근,오정환,Park, Jin-Young,Park, Hong-Geun,Oh, Jeong-Hwan 대한관절경학회 2006 대한관절경학회지 Vol.10 No.2

불안정성 견관절에 대한 진단과 치료는 정형외과 영역에서 가장 어려운 분야 중에 하나이다. 관절와 위에서 움직이는 상완골두의 아탈구와 정상적인 전이, 통증과 기능 저하를 일으키는 이완의 정도는 구별하기가 용이하지 않는 경우가 많다. 불행하게도 이 불안정성을 일으키는 모든 병변에 시행할 수 있는 가장 좋은 한가지의 치료법은 개발되어 있지 않다. 그러므로 불안정성의 방향과 정도뿐만 아니라 동반된 문제까지도 정확히 진단하는 것이 절대 필요하다. 해부학적 결손은 반드시 확인해야 한다. 불안정성에 대한 봉합술의 실패에 영향을 미칠 수 잇는 흔한 요인은 다음과 같다. 정확한 해부학적 병리소견을 확인하는 올바른 진단, 올바른 치료 방법에 대한 이유, 필요 없는 내고정물의 사용이나 불안정성, 관절염, 신경 및 혈관 손상 등을 남길 수 있는 도달법의 사용과 같은 기술적 결함 등이 있다. 술후 견관절의 안정성, 유연성, 지구력을 회복시켜 강도높은 스포츠나 노동에 복귀할 수 있는 잘 준비된 재활을 통해 추가적인 손상을 막아야 한다. Diagnosis and treatment of the unstable shoulder is one of the more difficult problems in orthopaedic surgery. There is confusion between the normal laxity with translation and subluxation of the humeral head relative to the glenoid and an abnormal amount of laxity, leading to pain and dysfunction. Unfortunately, there is no single treatment that applied to all lesions that cause the instability. It is imperative, therefore, that an accurate diagnosis be made, including the directions and degree of shoulder instability as well as any coexisting problems. Anatomical defects must be defined. Common factors that could most readily compromised instability repair are examined. These include techniques for making an accurate diagnosis with identification of the precise anatomical pathology, and the rationale for appropriate surgical treatment with the avoidance of technical complication such as unnecessary hardware or exposures that might lead to residual instability, arthritis, and nerve or vascular injuries. Additional injuries may be prevented by careful rehabilitation postoperatively to restore shoulder stability, flexibility, and endurance prior to an individual's return to stressful sports or work.

자연분해비닐 논토양 피복이 저서성 대형무척추동물의 군집구조에 미치는 영향

박진영,권순직,남홍식,강충길,박종균,Park, Jin-Young,Kwon, Soon-Jik,Nam, Hong-Sik,Kang, Chung-Kil,Park, Jong-Kyun 한국응용곤충학회 2011 한국응용곤충학회지 Vol.50 No.2

본 연구는 2009년 5월부터 9월까지 경기도 수원시 당수동에 자연분해비닐을 피복한 논의 저서성대형무척추동물의 종류와 군집구조 영향을 파악하기 위해 조사하였다. 실험구는 5개로 왕우렁이농법(GF), 자연분해비닐+유기농법(NOF), 자연분해비닐+화학농업(NCF), 관행농법(CF), 무처리구(NF)를 설정하였다. 조사결과 저서성대형무척추동물의 종수와 개체수 각각 NOF>GF>NF>NCF>CF, NOF>NCF>CF>NF>GF순으로 나타났다. 우점도지수(DI)는 각 실험구에서 0.43~0.95로 나타났으며, 평균 우점도지수는 GF>NCF>NF=CF>NOF 순으로 각각 나타났다. 종다양도지수(H')는 0.49~2.93로 나타났으며, 평균 종다양도지수는 NOF>NF>GF>CF>NCF 순으로 각각 나타났다. 비닐 피복 후 시간이 경과함에 따라 저서생물은 조금씩 회복이 되어가는 경향이 있었으나, 거머리류와 수서딱정벌레류가 증가하는 경향이 있었다. 비닐피복에 의해 민감하게 반응한 분류군은 환형동물문과 연체동물문이었으며 피복 후 종수와 특히 개체수가 매우 떨어졌으며, 이후 종수는 회복되는 경향이 있었으나 개체수는 줄어들었다. This study was conducted to investigate the influence of natural degrading polymer film covering in rice paddies on the benthic macroinvertebrate community structure in Dangsu-dong, Suwon, Gyeonggi-do from May 2009 to September 2009. We compared 5 treatments: golden apple snail farming (GF), natural degrading polymer film + organic farming (NOF), natural degrading polymer film + chemical farming (NCF), conventional farming (CF), and no fertilization (NF) as the control. The total number of species was highest in NOF followed by GF, NF, NCF, and CF. The total number of individuals was highest in NOF followed by NCF, CF, NF, and GF. The Dominance index (DI) ranged from 0.43 to 0.95. The highest dominance index was in GF followed by NCF, NF=CF, and NOF. The species diversity index (H') for each experimental plot ranged from 0.49 to 2.93. The average species diversity index was highest in NOF followed by NF, GF, CF, and NCF. After the natural degrading polymer film covered the paddies, the benthic macroinvertebrates tended to recover, but leeches and aquatic beetles increased. Mollusca and Annelida, which are sensitive taxa, decreased in both species and individual numbers after the soil was covered with the natural degrading polymer film. The number of species tended to recover. However, the number of individuals continued to decrease.d, especially individuals. Since then, the number of species tended to recover. However, the number of individuals decreased.

철골중간모멘트골조의 붕괴성능 I

박진영,이원호,김형준,Park. Jin-Young,Yi. Waon-Ho,Kim. Hyung-Joon 한국방재학회 2014 한국방재학회논문집 Vol.14 No.2

국내 구조기준인 KBC2009는 성능기반설계의 설계지진에서의 인명안전수준을 만족시키기 위한 기준은 명시적으로 제시하고 있지만 최대급지진에서의 붕괴방지수준을 만족하기위한 기준은 암시적으로 제시하고 있다. 따라서 본 연구에서는 층수별로 구분된 세 개의 철골중간모멘트골조의 표본건물을 설계 및 모델링하였다. 비선형 시간이력해석을 통하여 설계지진에서의 인명안전수준의 만족여부와 최대급지진에서 붕괴방지수준의 만족여부를 조사하였다. 그리고 이러한 내진성능목표들을 달성하기 위한 붕괴성능에 가장 큰 영향을 미치는 변수인 저층부 기둥의 소성변형능력을 변화시켜 표본건물의 전체적, 국부적 동적응답을 관찰하였다. Domestic structural design code, KBC2009 specify the criteria for satisfying life safety level in design earthquake. But criteria for satisfying collapse prevention level in maximum considered earthquake are stated allusively. This study designed and modeled three prototype structure of steel intermediate moment resisting frame classified with the number of story. Through nonlinear time history analysis, adequacy of life safety level in design earthquake and collapse prevention level in maximum considered earthquake are evaluated in this study. global and local dynamic response of prototype structures were observed changing the plastic deformation capacity which is one of the most important factor in collapse capacity to achieve two seismic capacity goals; life safety level in design earthquake and collapse prevention level in maximum considered earthquake.

Larva of Lilioceris (Lilioceris) ruficollis (Coleoptera: Chrysomelidae) from Korea

박진영,이종은,박종균,Park, Jin-Young,Lee, Jong-Eun,Park, Jong-Kyun Korean Society of Applied Entomology 2012 한국응용곤충학회지 Vol.51 No.1

약용식물로 알려진 마류($Dioscorea$ spp.)를 기주로 하고 있는 고려긴가슴잎벌레[$Lilioceris$ ($Lilioceris$) $ruficollis$ (Baly, 1865)]의 유충에 대한 그림과 기재를 처음으로 보고하였다. 또한 그들의 분류학적 소견 및 생태적 특징도 작성하였다. Detailed morphological descriptions and illustrations of the last instar larva of $Lilioceris$ ($Lilioceris$) ruficollis (Baly, 1865) with the host species, $Dioscorea$ spp., are presented for the first time. Taxonomical and ecological remarks on their biology are also given herein.

Full-scale 저경도 납면진받침의 온도의존성에 대한 실험적 연구

박진영,장광석,이홍표,이영학,김희철,Park, Jin Young,Jang, Kwang-Seok,Lee, Hong-Pyo,Lee, Young Hak,Kim, Heecheul 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.6

납코어가 삽입된 적층고무받침은 주요 재료가 온도에 대한 의존성을 보유하고 있으므로 온도 환경이 장치의 성능에 미치는 영향이 적지 않다. 따라서, 본 논문에서는 대표적인 면진장치인 납면진받침에 대하여 실규모 장치를 제작하고 온도변화에 따른 강성 및 감쇠 특성변화에 대하여 실험을 통하여 분석하고 평가하였다. 실물 크기의 납면진받침을 사용하여 $-10^{\circ}C$, $0^{\circ}C$, $10^{\circ}C$, $20^{\circ}C$, $30^{\circ}C$, $40^{\circ}C$의 온도 조건에 대하여 ISO22762:2010에서 제시하고 있는 특성시험법을 적용하여 수직강성 및 수평특성에 대하여 의존성 경향을 파악하였다. 또한, 면진받침 설계 시 주요한 평가지표로 사용되는 2차강성 및 특성강도에 대하여 해외 제조사에서 제시하고 있는 온도보정식과 시험결과를 비교하였으며 수직강성에 대한 온도의존 경향을 파악하였다. Rubber laminated bearings with lead core are highly affected by changes in temperature because key materials which are rubber and lead have temperature dependencies. In this study, two full scale LRB(D800, S=5) are manufactured and temperature dependency tests on shear properties are accomplished. The shear properties at the 3rd cycle are used at $-10^{\circ}C$, $0^{\circ}C$, $10^{\circ}C$, $20^{\circ}C$, $30^{\circ}C$, $40^{\circ}C$ respectively. The double shear configuration, simultaneously testing two pieces, is applied for compression shear test in order to minimize the friction effects due to the test machine, described in ISO 22762-1:2010. Characteristic strength, post-yield stiffness, effective stiffness, equivalent damping ratio are estimated and presented coefficient due to the temperature changes.