• 대한족부족관절학회지
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• 제17권4호
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• pp.302-308
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• 2013

Purpose: To present clinical results of proximal first metatarsal opening wedge osteotomy and low profile plate fixation in hallux valgus deformity. Materials and Methods: Thirty-two patients (39 feet) underwent surgery for hallux valgus deformity. Fourteen patients (18 feet; Group A) underwent proximal first metatarsal opening wedge osteotomy fixed with low profile titanium plate ($Arthrex^{(R)}$), and 18 patients (21 feet; Group B) underwent proximal chevron osteotomy with two K-wires. Improvement in hallux valgus angle (HVA), 1, 2 intermetatarsal angle (IMA), range of motion of 1st metatarsophalangeal joint, VAS score, and the length of first metatarsal on weight-bearing radiograph were evaluated preoperatively and at final follow-up. Results: HVA improved from $36.2{\pm}6.6$ degrees to $11.7{\pm}5.1$ degrees, and 1, 2 IMA improved from $15.7{\pm}2.6$ degrees to $7.2{\pm}1.9$ degrees. VAS score improved from $7.2{\pm}1.2$ to $1.4{\pm}0.9$. There were no significant differences clinically and radiologically. Conclusion: Proximal first metatarsal opening wedge osteotomy with stable fixation using low profile plate may be an effective surgical option for correction of hallux valgus deformity.

• 한국인터넷방송통신학회논문지
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• 제23권5호
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• pp.103-108
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• 2023

본 논문에서는 미사일의 눈 역할을 하는 탐색기에 적용할 수 있는 AESA 안테나의 성능 고도화 연구를 진행하고 실제 측정을 통해 안테나 성능을 검증하였다. AESA 안테나 설계 시에는 필연적으로 발생하는 복사소자 간의 상호간섭 영향으로 송신 시 능동반사계수의 최적화를 고려해야하며, 탐색기의 공간 제한을 극복할 수 있는 소형/경량화가 적용된 복사소자의 선정이 중요한 설계 고려 사항이다. 이에 탐색기용 AESA 구조에 적용하기 위한 배열안테나 연구를 통해 전기적 성능 및 Low-profile 구조 측면에서 최적화가 필요하다. 본 논문에서 설계하고 측정한 복사소자는 일반적인 비발디 안테나의 성능을 고도화시키면서 Low-profile 구조를 만족할 수 있는 Step Flared Notch(SFN)를 설계하였다. 본 논문을 통해 SFN은 일반적인 비발디 안테나와 동일하게 광대역 특성을 가지며 AESA 안테나에 필요한 특성들이 최적화 된 특성을 보유함을 확인 할 수 있었다. 시뮬레이션을 통해 최적화 된 구조는 실제 프로토타입 안테나 제작을 통해 패턴 특성과 능동반사계수 특성을 확인하였다.

• 동아시아경상학회지
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• 제11권2호
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• pp.1-13
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• 2023

Purpose - The purpose of this study is to identify emotional intelligence (EI) profiles according to the sub-factors of the ability EI model, namely, self-emotional appraisal, others' emotional appraisal, regulation of emotion, and use of emotion. In addition, this study aims to reveal whether there is a difference in job satisfaction, affective commitment, and turnover intention depending on the profile. Research design, data, and methodology - For the study, 536 survey responses were analyzed using SPSS 22 and MPlus 8.4. Result - The analysis identified four EI profiles. These were 1) middle-low generalized EI (all sub-factors of EI were slightly lower than the average level), 2) middle-high generalized EI (all sub-factors of EI were slightly higher than the average), 3) low generalized EI (all EI sub-factors were much lower than the average), and 4) high generalized EI (all EI sub-factors were much higher than average). Furthermore, significant differences were found in job satisfaction, affective commitment, and turnover intention according to each profile. Conclusion - This study expands the EI theory by revealing the profile of EI. In addition, this study investigated the impact of EI profile on job satisfaction, affective commitment, and turnover intention.

• Korean Chemical Engineering Research
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• 제50권3호
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• pp.588-593
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• 2012

불포화 폴리에스터(unsaturated polyester, UP)와 저수축제(low profile agent, LPA), 폴리스틸렌(polystyrene, PS)과의 compatibility가 불포화 폴리에스터와 저수축제의 비율, 혼합시간, 혼합온도 그리고 추가로 투입되는 불포화 폴리에스터 수지량과 같은 다양한 조건하에서 확인되었다. 1단계로 1700 rpm의 교반속도에서 제조된 수지 혼합액의 경우, 불포화 폴리에스터 수지(unsaturated polyester resin, UPR) 투입량 25 g, 약 $30^{\circ}C$의 반응온도에서 상대적으로 작은 입자 크기 및 상분리율을 나타내었다. 2단계 수지 혼합액의 경우, 2차로 투입된 45 g의 불포화 폴리에스터 수지 혼합액에서 향상된 compatibility를 보였다. 이러한 결과는 혼합조건이 불포화 폴리에스터 수지와 저수축제 혼합액의 compatibility에 중요한 역할을 한다는 것을 의미한다. 또한, 상기조건을 통해 제조된 sheet molding compound (SMC)를 사용해서 만든 샘플은 흡수율, 수축율 및 광택도에서 향상된 결과를 나타내었다.

• Advances in materials Research
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• 제6권1호
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• pp.65-78
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• 2017

A hat section was designed and developed for maximum impact energy absorption and/or transmission under low velocity impact. Towards this, different hat sections, having material properties of thermoplastic, were modeled and investigated numerically using finite element analysis (FEA) in the range of 20-50 J impact energy. In the study it was experienced that the design configuration of hat section with curvilinear profile (HSCP) was excellent in energy attenuation capacity and for even distribution of maximum impact force around and along the hat section under low velocity impact loading. To validate the numerical findings, polypropylene copolymer (Co-PP) HSCP and low density polyethylene (LDPE) HSCP were developed and evaluated experimentally in the said impact energy range. A correlation was established between FEA and experimental test results, thereby, validating a numerical model to predict results for other thermoplastic materials under given range of impact energy. The LDPE HSCP exhibited better performance as compared to Co-PP HSCP in the said range of impact energy. The findings of this study will enable the engineers and technologists to design and develop low velocity impact resistance devices for various applications including devices to protect bone joints.

• 한국생산제조학회지
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• 제24권2호
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• pp.231-237
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• 2015

The pin-gear drive is a special form of fixed-axle gear mechanism. A large wheel with cylindrical pin teeth is called a pinwheel. As pinwheels are rounded, they have a simple structure, easy processing, low cost, and easy overhaul compared with general gears. They are also suitable for low-speed, heavy-duty mechanical transmission and for occasions with more dust, poor lubrication, etc. This paper introduces a novel slewing ring bearing with an external pinwheel gear set (e-PGS). First, we consider the exact cam pinion profile of the e-PGS with the introduction of a profile shift. Then, the contact stresses are investigated to determine the characteristics of the surface fatigue by varying the shape design parameters. The results show that the contact stresses of the e-PGS can be lowered significantly by increasing the profile shift coefficient.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.585-592
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• 2009

The performance of screw compressor depends on lots of design parameters of rotor profile, such as length of seal line, wrap angle, blow hole, suction and discharge port size, number of rotor lobe, etc. The optimum rotor profile makes it possible to increase the compression efficiency with low energy consumption, and to minimize the loss of power. In this research, a new rotor profile design and performance analysis are done by computer simulation. It is expected that the volumetric efficiency is improved because the internal leakage is reduced due to the minimization of blow hole and clearance, and the stiffness of rotors is increased due to the reduction of length to diameter ratio. Also, the specific power consumption will be secured for use ranging from low to high operation speed.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.247-250
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• 2003

The current paper presents the design and implementation of a low-profile dc-to-dc converter developed as a power supply for the sustain driving: circuit inside large-area wall-mount ac PDP application systems. Details on the design and implementation of a 500 W prototype dc-to-dc converter, miniaturized within a 230 mm$\times$ 130 mm area with a thickness of 25 mm while still achieving a 95 $\%$ conversion efficiency, are presented to demonstrate the feasibility and application potentials of the proposed low-profile dc -to-dc converters.

• Journal of electromagnetic engineering and science
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• 제16권4호
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• pp.235-240
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• 2016

In this paper, a low-profile planar inverted-F antenna (PIFA) for ultrawideband (UWB) applications is proposed. The antenna consists of a PIFA and a ground plane with a slot. The addition of the slot not only improves the impedance matching of the PIFA but also forms an additional resonance. Therefore, the proposed antenna has a wideband characteristic covering the full UWB frequency range (3.1 GHz to 10.6 GHz) and a stable and nearly omnidirectional radiation pattern. The antenna also has a smaller volume and thickness compared to previous UWB PIFAs.

• Journal of Chest Surgery
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• 제25권10호
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• pp.1041-1047
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• 1992

The consecutive 35 patients underwent isolated aortic valve replacement with the low-profile model of the Ionescu-Shiley pericardial xenograft valve from 1984 to 1991. Operative mortality was 2.9%, and early survivors were followed up for a total 136.1 patient-years[Mean$\pm$SD, 4.00$\pm$2.14 years]. The linearized late mortality was 2.204% /pt-yr. Three patients required rereplacement of the valve with overall valve failure rate of 2.204% /pt-yr: two for endocarditis and one for paravalvular leak. There was no case of primary tissue failure. The linearized annual rates of complication were: thromboembolism 0.735% /pt-yr, bleeding 0.735%pt-yr, and endocarditis 2.204% /pt-yr. The actuarial survival at 8 years of follow-up was 90.4$\pm$5.3%, and the probabilities of freedom from thromboembolism and from rereplacement were 95.6$\pm$4.4% and 88.2$\pm$6.7% at 8 years respectively. Although the low profile Ionescu-Shiley pericardial valve provided favorable clinical performance comparable with the standard model up to 8 years, it needs prolonged follow-up to assess the pattern of its durability.