• 제목/요약/키워드: Impulse Motor

검색결과 67건 처리시간 0.024초

알루미늄 함량에 따른 로켓보조추진탄용 추진제 특성 (Propellant Characteristics used for a Rocket-Assisted Projectile with Aluminium Contents)

  • 정재윤;최성한
    • 한국추진공학회지
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    • 제23권5호
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    • pp.60-66
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    • 2019
  • 본 논문은 알루미늄 함량 변화에 따른 로켓보조추진탄(RAP) 용 추진제의 공정특성(점도), 기계적 물성, 연소특성, 지상 및 비행시험 결과에 관하여 기술하였다. 알루미늄 함량이 증가되면 초기점도는 감소하고 점도 build-up은 빨라지며 연소속도 및 압력지수가 감소하는 것을 확인하였다. 지상연소시험에서는 알루미늄이 10 wt% 함유된 RAP이 알루미늄이 2 wt%, 18 wt% 함유된 RAP에 비해 총역적이 약 5% 높았으며, 이론성능 대비 모터 효율은 알루미늄이 18 wt% 함유된 조성이 85.6%로 가장 낮았다.

간호직 공무원의 코로나19 스트레스, 충동성, 가족건강성이 자살생각에 미치는 영향요인 (Influencing Factors of COVID-19 Stress, Impulsiveness, and Family Strength on Suicidal Ideation of Public Nursing Officials in Community Health Center)

  • 이안나;박완주
    • 한국보건간호학회지
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    • 제36권3호
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    • pp.323-333
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    • 2022
  • Purpose: This study was conducted to identify factors of COVID-19 stress, impulsiveness, and family strength on suicidal ideation of public nursing officials in community health centers. Methods: This study was a descriptive analysis study the subjects of this study were a total of 145 public nursing officials from community health centers in Busan. The data were analyzed using IBM SPSS/WIN 23.0 version. Result: The result of the predictor analysis showed that the motor impulsiveness (β=.383, p<.001), workload (β=.222, p=.003), cognitive impulsiveness (β=-.205, p=.012), bond (β=-.169, p=.033). The regression model showed an explanatory power of 24.1%. Conciusion: it is necessary to increase impulse and stress control ability, and to adjust the workload. In addition, it is necessary to systematically guarantee a working environment where practical vacation can be used, but it may not be a realistic alternative in a disaster crisis such as COVID-19, so indirect alternatives such as reinforcing infectious disease experts, improving the work environment, and psychological support to prevent suicide in advance are required.

Facial reanimation with masseter nerve-innervated free gracilis muscle transfer in established facial palsy patients

  • Oh, Tae Suk;Kim, Hyung Bae;Choi, Jong Woo;Jeong, Woo Shik
    • Archives of Plastic Surgery
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    • 제46권2호
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    • pp.122-128
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    • 2019
  • Background The masseter nerve is a useful donor nerve for reconstruction in patients with established facial palsy, with numerous advantages including low morbidity, a strong motor impulse, high reliability, and fast reinnervation. In this study, we assessed the results of masseter nerve-innervated free gracilis muscle transfer in established facial palsy patients. Methods Ten patients with facial palsy who received treatment from January 2015 to January 2017 were enrolled in this study. Three patients received masseter nerve-only free gracilis transfer, and seven received double-innervated free gracilis transfer (masseter nerve and a cross-face nerve graft). Patients were evaluated using the Facial Assessment by Computer Evaluation software (FACEgram) to quantify oral commissure excursion and symmetry at rest and when smiling after muscle transfer. Results The mean time between surgery and initial movement was roughly 167.7 days. A statistically significant increase in excursion at rest and when smiling was seen after muscle transfer. There was a significant increase in the distance of oral commissure excursion at rest and when smiling. A statistically significant increase was observed in symmetry when smiling. Terzis' functional and aesthetic grading scores showed significant improvements postoperatively. Conclusions Masseter nerve innervation is a good option with many uses in in established facial palsy patients. For some conditions, it is the first-line treatment. Free gracilis muscle transfer using the masseter nerve has excellent results with good symmetry and an effective degree of recovery.

Does Strategy of Downward Stepping Stair Due to Load of Additional Weight Affect Lower Limb's Kinetic Mechanism?

  • Ryew, Checheong;Yoo, Taeseok;Hyun, Seunghyun
    • International journal of advanced smart convergence
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    • 제9권4호
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    • pp.26-33
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    • 2020
  • This study measured the downward stepping movement relative to weight change (no load, and 10%, 20%, 30% of body weight respectively of adult male (n=10) from standardized stair (rise of 0.3 m, tread of 0.29 m, width of 1 m). The 3-dimensional cinematography and ground reaction force were also utilized for analysis of leg stiffness: Peak vertical force, change in stance phase leg length, Torque of whole body, kinematic variables. The strategy heightened the leg stiffness and standardized vertical ground reaction force relative to the added weights (p<.01). Torque showed rather larger rotational force in case of no load, but less in 10% of body weight (p<.05). Similarly angle of hip joint showed most extended in no-load, but most flexed in 10% of body weight (p<.05). Inclined angle of body trunk showed largest range in posterior direction in no-load, but in vertical line nearly relative to added weights (p<.001). Thus the result of the study proved that downward stepping strategy altered from height of 30 cm, regardless of added weight, did not affect velocity and length of lower leg. But added weight contributed to more vertical impulse force and increase of rigidity of whole body than forward rotational torque under condition of altered stepping strategy. In future study, the experimental on effect of weight change and alteration of downward stepping strategy using ankle joint may provide helpful information for development of enhanced program of prevention and rehabilitation on motor performance and injury.

책임능력판단에 관한 범죄심리학적 이론과 정신장애 항변 연구 (A Study on the Responsibility Judgment and Mental Disorder of Criminal Psychology)

  • 임상곤
    • 시큐리티연구
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    • 제10호
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    • pp.293-322
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    • 2005
  • 본 연구는 형사책임과 관련성이 있다고 생각되는 일치추론이론과 외부귀인이론 등을 통해 도의적 책임판단에 관한 범죄심리학적 이론을 연구하여 미국에서 배심원이 유무죄의 평결을 도출해 내는 판단과정에 관한 이론적 관점들을 접근하고자 한다. 정신장애(insanity)는 형사책임능력에 관한 법적인 개념이며 임상적인 혹은 정신의학적인 개념이 아니다. 따라서 법체계가 다르면 정신장애의 정의도 달라지게 마련이다. 우리나 라 법과 미국의 법은 서로 매우 다른 체계를 가지고 있어서 미국법의 개념들이 한국법의 개념들과 불일치하는 경우가 매우 많은데, 형사책임능력에 관한 법이론적 개념들이 그 대표적인 예라고 할 수 있다. 우리나라의 형법은 심신상실(형사책임무능력)과 심신미약(한정책임능력)을 구분함으로 미국이나 영국에서 이용되는 정신장애의 개념이 직접 적용되지 않는다. 그럼에도 불구하고 최근에 들어 한국에서도 미국의 법에서 사용되는 정신장애의 개념에 대한 관심이 높아지고 있고, 형사책임의 법적판단에 임상적인 자료 및 전문가 의견이 큰 비중으로 고려되고 있으므로 법학과 심리과학(학문적 글로벌 개념)과 사이에 상호간 진지한 논의와 협력이 요구된다. 한국에서의 정신장애에 대한 정의와 구체적 기준들은 한국 형법의 전반적인 이론적 맥락에서 구축되어야 함은 분명한 것으로 사료된다. 그러나 그러한 조작정의가 객관적 진실을 전혀 도외시한 것이어서는 안된다고 사료되며, 따라서 이 문제에 관하여 실증적인 경험학문을 지향하는 심리학이나 정신의학 등의 행동과학과의 적극적인 협력이 절실히 요구된다.

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비점성 유동을 가정한 포 발사 램제트 추진탄 설계 (Design of Gun Launched Ramjet Propelled Artillery Shell with Inviscid Flow Assumption)

  • 강신재;박철;정우석;권태수;박주현;권세진
    • 한국추진공학회지
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    • 제19권4호
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    • pp.52-60
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    • 2015
  • 최근 군 전력 개편에 따라 1개 군단이 담당해야할 작전 영역이 확대됨에 따라 155 mm 화포체계의 사거리 연장은 중요한 이슈가 되었다. 80 km 이상 155 mm 화포 체계의 사거리를 연장하기 위해 새로 운 시도가 필요하다. 램제트 기관은 공기흡입식 기관으로 고체 연료 로켓에 비해 몇 배 이상 높은 비추력을 제공할 수 있어 같은 연료 무게로 더 멀리 포탄을 투사하는 것을 가능하게 한다. 램제트 기관을 포로 발사할 경우 포구 초속이 약 Mach 3 이므로 추가적인 부스터가 필요치 않다. 특히 고체 연료 램제트 (Solid Fuel Ram Jet, SFRJ)는 어떠한 구동기관이 없어 발사 시 높은 충격을 받는 포탄에 적용하기에 적합하다. 본 연구에서는 155 mm 화포체계를 위한 포발사 램제트 추진탄을 설계하기 위해 비점성 유동을 가정하여 공기 흡입구, 연소실, 노즐을 설계하였다. 설계 변수를 변화시키며 80 km 이상 사거리를 가지며, 고폭탄 탑재 용적을 최대화 할 수 있도록 설계하였다.

농촌의 전력및 전기기기의 이용특성분석 (Analysis of the Utilization Characteristics of Electrical Power and Equipments on the Farms)

  • 박승우;류한열
    • 한국농공학회지
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    • 제17권4호
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    • pp.3943-3955
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    • 1975
  • The purposes of this study are to evaluate the utilization characteristics of electrical power consumption, to grasp the present trends in the use of electrical equipments, to estimate the demand factor and load factor being held, and to evaluate the efficiency of electical uses for the recently electrified farms cultivating paddy rice. For the purposes, 109 sample farms located in eleven villiages electrified in six different years from 1968 to 1973, were chosen at random and investigated on 35 items concerning to electrical uses and wiring systems. The survey was carried out in 1975, in the vinicity of Suweon city. The results are summarized as follows: i) The average annual power consumption on sample farms is considered to be low, being 242.9 Kwh. in 1974, and varied according to the different electrified year and size of cultivated land, respectively. It has significant positive correlation to the area of farm, too. ii) Between the number of year of electrical uses and the power consumption, there is very significant positive correlation, which could be expressed as Y=43.041+16.108 X, where X represents the number of years of electrical uses. The annual increment of power consumption is much greater at the beginning of the electrification than that at the later years, its average being approximately 20 percent. However, it is recommended that any estimation of long-term increments should be carefully investigated. iii) The monthly power consumption varies considerably throughout a year, in which the heaviest farm load occurs in November. Observing the seasonal variation of consumption, the winter-time is the heaviest season while the summer is the lowest. The result implies house lighting is chief contribution to the present electrical consumption on the farms. Comparing the variation of monthly consumption ratios between the sample farms and industries, the electrical uses on the farms are independant of the industrial uses, and further, the agricultural uses are of inverse pattern to the farms from the results that there is negative correlationship between them, iv) The number of electrical equipments used on the farms are occupied chiefly by lighting sources. Next to the lighting sources, household appliances of small quantity and some motors are used. The mean electrical quantity is about 1, 127.4 watt, which corresponds to about 37.6 per cent to the contracted quantity. The composition of quantity is chiefly occupied by the electrical motor of about 1.5 hp., single-phased. The number of the annual utilization hours of each equipment is tabulated in Table IV-5. In contradiction to the high utilization of lighting sources and small household appliances, the motor is poorly used for approximately 22 hours in a year. v) More than 55 per cent of farms want to purchase new electrical equipments such as small household appliances and electrical motors in their number. The impulse of purchasing such items is stimulated by the contacts to the mass media and their knowledge on such equipments. Consequently, the increase of electrical uses could be prompted by such trials as education and demonstration. vi) The demand and load factors on the farms vary considerably according to the greater variation of the power consumption, daily or monthly. The daily demand factor is 22.4 per cent and load factor 18.6 per cent, while the annual demand factor is 1.3 per cent and load factor 70 per cent approximately. Therefore, the low efficiency of construction cost requires re-evaluation of the present contracted quantity of 3 Kw. or increase of electrical uses. vii) The electrical energy on the farms devoted chiefly to lighten the farm residences does not contribute to the farm incomes. Consequently, the cost of electrical consumption presses considerably upon the farm economy. Therefore, there is great need to build up the electrical uses on the farms through the development of new works and techinques to utilize any electrical equipments on the production of farm products. Further more, such the development should be related to increase the actual income of the farm consumers.

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