• The Journal of Korean Physical Therapy
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• 제22권6호
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• pp.21-28
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• 2010

Purpose: The purpose of this study was to investigate the kinematic adaptation of head and trunk to ascend stairs and a ramp. Subjects were healthy young adults. Three-dimensional kinematic patterns of head and trunk movements were examined during stair climbing and steeper ramp climbing. Methods: Fourteen young subjects with no history of chronic or acute musculoskeletal, cardiovascular or respiratory disorders took part in this experiment. Kinematic data were collected using a 6 camera Vicon system (Oxford Metrix, Oxford, England). Repeated measures ANOVA analyses were used to investigate the effect of gait mode on kinematics of the head and trunk. Results: The angle of the trunk while ascending stairs or a ramp was modified in three human planes (p<0.05). The angle of head and neck during the ascending of stairs or a ramp was not changed in the sagittal plane but was changed in the frontal and transverse planes (p<0.05). Conclusion: This study describes and discusses some basic kinematic mechanisms underlying the pattern of head and trunk changes during stair and ramp climbing and showed that postural adaptation of the head and trunk is necessary to maintain balance.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 추계학술대회논문집; 한국과학기술회관; 6 Nov. 1997
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• pp.244-249
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• 1997

The enclosure with a small opened area is extensively used in power plants to reduce the propagating noise from transformers. The radiation impedance associated with the location and width of the opened area, and the geometric configurations of internal acoustic field is very important to determine the basic acoustic characteristics of this partial enclosure. In this study, two-dimensional rectangular chambers with opened areas are investigated to examine the acoustic properties of the enclosure. The mode expansions of the physical variables defined on boundary surfaces are introduced to derive a simple algebraic equation. The acoustic characteristics can be easily predicted by this analytical approach, and the results well agree with physical grounds. Physical concepts as results of this work will be helpful to use the partial enclosure as a noise control element.

• 한국통신학회논문지
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• 제38C권4호
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• pp.344-350
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• 2013

초기 디자인 단계에서 효율적인 디자인 의사결정을 위해서는 지오메트리에 대한 고려가 필수적이다. 하지만 중요한 의사결정은 지오메트리에 대한 효율적 분석이 가능한 BIM모델 보다는 여전히 대화나 물리적 모델, 제스처를 통해 이루어진다. 본 논문은 실시간 BIM분석을 위한 BIM 모델과 물리적 모델의 연동을 제안한다. 두 모델이 실시간으로 연결되는 시스템 프레임워크를 통해 건축가는 디자인 초기 단계에서 부터 BIM 모델을 효율적으로 활용할 수 있다. 이 프레임워크는 건축가들이 설계 초기 단계에서부터 마지막 단계까지 컴퓨터의 기술을 활용한 동적인 의사결정을 가능하게 한다.

• 한국멀티미디어학회논문지
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• 제17권4호
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• pp.506-513
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• 2014

In recent years, research on user's activity recognition using a smart phone has attracted a lot of attentions. A smart phone has various sensors, such as camera, GPS, accelerometer, audio, etc. In addition, smart phones are carried by many people throughout the day. Therefore, we can collect log data from smart phone sensors. The log data can be used to analyze user activities. This paper proposes an approach to inferring a user's physical activities based on the tri-axis accelerometer of smart phone. We propose recognition method for four activity which is physical activity; sitting, standing, walking, running. We have to convert accelerometer raw data so that we can extract features to categorize activities. This paper introduces a recognition method that is able to high detection accuracy for physical activity modes. Using the method, we developed an application system to recognize the user's physical activity mode in real-time. As a result, we obtained accuracy of over 80%.

• 대한가정학회지
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• 제37권11호
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• pp.97-113
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• 1999

The purpose of this is to analyze the perception of sex image by feministic fashion based on the theory of feminism, which has been developed since the 1960’s. Feministic fashion is divided 8 style and analyzed. For this study, surveying photo of feministic fashion and making out questionnaires. The data was collected from 391 university student(184 male, 207 female) living in Taegu and Kyoungpok and is analyzed by factor analysis, t-test. The result are as follows: 1. The Tendency of perceiving Feministic Fashion’s Sexual Image Male had more positive view on the sexual image of see-through and Body-conscious styles than female. And male showed more negative view on the sexual image of lingerie, punk, madonna or disorganized style. There was no significant difference between male and female in their opinion on the sex appeal of fashion that exposed some physical part. Concerning the sexual image of unisex mode, both male and female had an idea that it had nothing to do with sex appeal. Regarding the preference for sex-expressive fashion, they favored see-through and Body-conscious styles most. 2. In relation to clothing behavior toward sex-expressive fashion, both male and female generally revealed a negative view on fashion that exposed physical part and provoked an impression of keen sex appeal. 3. Sexual perception degree about the body, in physical exposure, that physical part from which they felt sex appeal most was the breast. What they most wanted to emphasize was the breast, too. As a physical part that caused their rejection symptom and made them feel hatred both and female pointed out the hips.

• 한국통신학회논문지
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• 제33권4A호
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• pp.387-393
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• 2008

본 논문에서는 TDD HSDPA(Time Division Duplex High Speed Downlink Packet Access)와 WiBro(Wireless Broadband Portable Internet) 와 같은 이동통신 규격을 지원하는 SDR(Software Defined Radio) 단말 모뎀 플랫폼을 제안한다. 제안하는 SDR 플랫폼은 DSP, FPGA, 마이크로프로세서 등 프로그래밍 가능한 소자들을 채용하여 HSDPA와 WiBro와 같은 기능을 담당하는 프로그램 등이 하드웨어 플랫폼 상에 다운로드 가능하도록 하였다. 제안하는 플랫폼은 이동통신네트워크의 멀티모드 단말시스템을 위한 물리계층 규격의 기능검증 등에 사용될 수 있다. 본 논문은 먼저 HSDPA와 WiBro 시스템의 물리계층 수신구조를 설명하고, 제안하는 SDR 플랫폼의 하드웨어 구현 방법과 각 모드에 요구되는 기능과 구현한 하드웨어 플랫폼 상에서의 최적화된 신호 흐름의 설계방법을 제시한다. 마지막으로 테스트신호를 이용한 루프백(loopback) 테스트를 통하여 제안한 SDR 플랫폼 상에 동작하는 각 모드 별 링크 성능을 보여준다. 제시된 실험 성능은 컴퓨터 시뮬레이션 성능과 비교하였다.

• Journal of the Korean Wood Science and Technology
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• 제39권5호
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• pp.429-436
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• 2011

The selected physical and mechanical properties of non-certificated LVL circulated in domestic lumber market were investigated and compared to relevant standards. The tested LVL passed the moisture content and the soaking delamination rate limit as per domestic (KS) and Japanese standard (JAS). The evaluated mechanical properties were flatwise/edgewise bending strength, modulus of elasticity (MOE), horizontal shear and compressive strength. The 30 mm-thick LVL showed significantly higher bending strength than that of the 25 mm-thick LVL. The modulus of elasticity (MOE) showed same tendency in the results of bending strength. The edgewise bending strength and MOE were higher than that of flatwise bending strength and MOE. The horizontal shear strength values were also showed similar results to bending strength values. The tested results were compared each other and each products were graded according to JAS 701 grade specification. The failure mode of LVL in bending test showed the similar failure mode of solidwood that failed in a simple tension manner (splintery tension). The glue line failure was severe in 25 mm-thick specimens due to concentration of shear stress in layer discontinuity containing small voids and starved glue lines. In horizontal shear strength test, failure mode of LVL showed the typical horizontal shear failure. Compressive specimens failed with fiber crushing in company with apparent delamination that splitted along the length of the specimens. From the results, the complete bonding between lamination and consistency in thin veneer layer were considered as a critical factor in the mechanical properties of LVL. Moreover, the standard test procedure and specification for non-certificated LVL should be required to check the performance of uncertificated materials.

• 한국식품과학회지
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• 제36권3호
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• pp.518-521
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• 2004

이상계 용매시스템을 이용하여 물질을 고순도로 대량 분리 할 수 있는 기술인 countercurrent chromatography를 이용하여 인삼으로부터 생리황성 성분인 saponin을 대량 분리 농축하였다. 용매 조성별 인삼 saponin의 분배계수에 따른 인삼 saponin 분리에 적합한 용매시스템은 chloroform/methanol/water(40/39/21, v/v/v)으로 결정되었으며 HSCCC의 작동 조건은 chloroform/methanol/water 용매시스템의 하층부를 이동상으로 한 head to tail mode에서 이동상의 유속 5mL/min, 인삼추출물 injection량 $200{\mu}L$, 컬럼회전속도 800 rpm의 조건이 적합한 것으로 판단되었다. 이러한 조건하에서 분리된 인삼saponin의 양은 $550.7{\mu}g$으로 HSCCC에 주입한 인삼 추출물 $200{\mu}L$중에 존재하는 총 saponin의 양 $865.5{\mu}g$에 비교하여 전체 수율은 63.6%로 나타났으며 TLC로 각 분획의 순도를 확인할 수 있었다.

• 한국전자통신학회논문지
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• 제15권3호
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• pp.479-486
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• 2020

이 논문에서는 아날로그 전류모드 인공지능 프로세서에서 핵심 디바이스 중에 하나인 아날로그 전류 모드 곱셈기 회로의 선형성과 동적범위 향상을 위한 설계 기법을 소개한다. 제안하는 회로는 4 quadrant Translinear loop를 NMOS 트랜지스터만으로 구성하여, 트랜지스터의 물리적 Mismatch를 최소화하는 설계로 0.35㎛ CMOS 공정에서 117㎛ × 109㎛로 구현가능하였으며, 최대 전고조파왜율 0.3% 의 선형성을 확보할 수 있었다. 제안한 아날로그 전류모드 곱셈기는 전류모드 인공지능 프로세서의 핵심 회로로 유용할 것으로 기대된다.

• 한국광학회지
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• 제28권6호
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• pp.351-355
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• 2017

본 논문에서는 포화흡수체의 투과변조깊이 조절을 통해 다양한 펄스 상태를 한 공진기 안에서 구현하는 방법에 관한 전산 모사를 진행하였다. 포화흡수체의 투과변조깊이의 크기 변화만으로 큐스위치드 레이저, 큐스위치드 모드 잠금 레이저, 모드 잠금 레이저 등 원하는 펄스 레이저 상태로 전환이 가능하다는 실험적 연구가 있어 왔으며, 이러한 연구가 이론적으로 부합하는 내용임을 확인하기 위해 Haus master 식을 사용하여 전산 모사를 진행하였다. 큐스위칭된 광 파워를 모사하기위해 이득 값은 시간 의존성을 가지도록 반응속도식을 적용하였다. 그 결과 투과변조깊이가 증가함에 따라 모드 잠금 레이저에서부터, 큐스위치드 레이저, 큐스위치드 레이저로 동작함을 확인하였고, 이는 이론적으로 예측된 경향성과 일치하였다.