• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.476-479
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• 2003

Recently, Bluetooth has been regarded as a new technology for short-range wireless connection. Although initial application of Bluetooth technology has been focused mainly on replacing cables between hand-held devices due to a limited packet size and short-range, general wireless telecommunication such as PAN and Ad hoc networks via Bluetooth-equipped devices is expected to be one of the most popular applications. Wireless equipments have been used to exchange data between host and mobile unit. The exchanging data may be several bytes of control command and the value of sensors with ultra-sonic, vision sensor, and encoder from mobile robot. However, most wireless equipments have some drawbacks such as lack of authentication, large size and high price. On the other hand, the benefits of Bluetooth are small size, low power, low price except short-range. Especially, there are some difficulties when wireless modules are used in indoor environments. In this paper, a method of using wire network in Bluetooth network is investigated as a solution to overcome the short-range problem of Bluetooth and difficulty in indoor environment.

• Archives of Plastic Surgery
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• 제48권3호
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• pp.305-309
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• 2021

Microsurgical procedures are time-consuming and sometimes fatigue-inducing. However, a skilled assistant and scrub nurse can help surgery be performed more smoothly and rapidly. Three microsurgical simulation courses were held for perioperative nurses at our institution. Each course consisted of two lectures and two practice microsurgical sessions, and was evaluated with a post-course survey. The respondents all felt that their knowledge of microsurgical instruments, sutures, microscope set-up, and microsurgical skills had improved following the course. Many felt that their ability to predict what the surgeon would request during a microsurgical case improved, and that they were able to handle instruments and sutures better. The nurses also reported improved confidence in assisting with microsurgical procedures and tolerance of the long operative time in some microsurgical cases. Based on our experience, a basic microsurgery course for nurses can play a significant role in training effective and competent microsurgical scrub nurses.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권5호
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• pp.2363-2374
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• 2016

Communication occurs through verbal elements, which usually involve language, as well as non-verbal elements such as facial expressions, eye contact, and gestures. In particular, among these non-verbal elements, gestures are symbolic representations of physical, vocal, and emotional behaviors. This means that gestures can be signals toward a target or expressions of internal psychological processes, rather than simply movements of the body or hands. Moreover, gestures with such properties have been the focus of much research for a new interface in the NUI/NUX field. In this paper, we propose a method for recognizing the number of fingers and detecting the hand region based on the depth information and geometric features of the hand for application to an NUI/NUX. The hand region is detected by using depth information provided by the Kinect system, and the number of fingers is identified by comparing the distance between the contour and the center of the hand region. The contour is detected using the Suzuki85 algorithm, and the number of fingers is calculated by detecting the finger tips in a location at the maximum distance to compare the distances between three consecutive dots in the contour and the center point of the hand. The average recognition rate for the number of fingers is 98.6%, and the execution time is 0.065 ms for the algorithm used in the proposed method. Although this method is fast and its complexity is low, it shows a higher recognition rate and faster recognition speed than other methods. As an application example of the proposed method, this paper explains a Secret Door that recognizes a password by recognizing the number of fingers held up by a user.

• 정보교육학회논문지
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• 제10권2호
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• pp.219-226
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• 2006

어노테이션(annotation)은 문서에서 개인의 의견, 정리, 요약 등을 표현하기 위한 주석을 의미한다. 따라서 전자문서에서도 어노테이션은 중요하게 사용되며 특히 전자 잉크(digital inking)릉 이용한 이동 단말기 환경에서 효과적으로 사용된다. 그러나 기존 연구에서는 휴대용 단말기 환경의 단점인 적은 디스플레이 공간을 전혀 고려하지 않기 때문에 어노테이션 작성 및 활용이 매우 불편하다. 따라서 본 논문에서는 전자펜과 이동식 단말기 환경을 고려한 어노테이션 모델 및 시스템을 제안한다. 제안 어노테이션 모델은 다양한 컨텍스트(context)를 고려하고 이에 기반한 어노테이션 마크업 언어를 정의한다. 본 모델은 다양한 어노테이션 타입 및 의미(semantic) 모델, 펜 기반 어노테이션의 자동 인식 및 영역 보정 기능 등을 고려하며, 이것을 기반으로 CAML(Context-based Annotation Markup Language)를 정의한다. 또한 본 모델을 이용하여 XML 기반의 전자책문서 및 단말기 환경을 고려한 어노테이션 시스템을 구현하고 그 활용 가능성에 대하여 살펴본다. 본 연구의 결과는 eLearning, Cyber-Class, IETM(Interactive Electronic Technical Manuals) 에서 적절히 응용 가능하다.

• 한국콘텐츠학회논문지
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• 제17권6호
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• pp.287-295
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• 2017

본 연구에서는 지문을 촬영할 때 촬영 조건이 지문 사진의 품질에 미칠 수 있는 영향에 대하여 해상도 측면에서 알아보았다. 두 개의 융선이 정확히 분리되고 식별되는 것은 지문 사진의 법과학적 가치에 있어서 매우 중요한 역할을 하며 이것은 두 개의 융선 사이에 존재하는 경계영역의 화소를 수치화하여 확인할 수 있다. 본 연구에서는 동일한 지문을 대상으로 ISO에 의한 품질의 변화, 촬영 시 발생하는 흔들림에 의한 품질의 변화, 촬영자의 경험과 기술에 의한 품질의 변화를 Adobe photoshop CS 6을 사용하여 분석하였다. 그 결과 ISO에 의한 품질의 변화는 큰 차이가 없었다. 또한, 손에 들고 촬영할 경우에는 일반인 그룹과 현직 과학수사요원 그룹 간에 유의미한 차이는 없었다. 그러나 삼각대를 사용 여부에 따른 지문의 품질에는 유의한 차이가 있었다. 따라서 본 연구는 미세한 융선과 특징점 까지 촬영해야 하는 지문 근접촬영 시 삼각대를 사용하는 것이 중요하다는 사실을 실험을 통해 입증하였다는 것에 의의가 있다.

• 한국전문물리치료학회지
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• 제24권4호
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• pp.38-45
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• 2017

Background: To improve muscle flexibility, static stretch is the most common type and is considered safe and effective for improving overall flexibility of muscles. During the stretch, the intensity is more likely to be determined by the degree of an athlete's pain and practitioner's skills rather than quantitative measures of stretch. It is necessary to determine the optimal intensity for the stretch. Objects: The purpose of this study is to explore the relationship between hand held dynamometer (HHD) and verbal rating scale (VRS) in comparison of the effects of continuance time on active (walking) and inactive (sitting) movement after static stretch. Methods: A cross-sectional study was conducted with a sample (n=62) recruited from a university. Participants were randomly assigned to 2 different groups (n=31 for each group) based on participants' positions either remaining in sitting or freely walking around for a series of re-assessments. Data was collected at pre-warm up, pre-stretch, post-stretch, and additional assessments at the time of 3, 6, 9, 12, 15, 20 and 30 minutes after the stretch. Results: Relationship between VRS and HHD scores represents very weak correlation (Spearman's p=-.16, p>.05). Pearson's correlation analysis was conducted following the logarithmic transformation of the two scores. Pearson's correlation after the transformation still showed a very low relationship and a poor linear relationship between the two scores (Pearson's r=-.18, p>.05). Conclusion: The optimal intensity for stretch cannot be solely determined by the subjective pain perception. The objective measurement such as HHD could be used in conjunction with the pain perception.

• Journal of Trauma and Injury
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• 제26권3호
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• pp.248-251
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• 2013

Introduction: A post-traumatic mesenteric arteriovenous fistula (AVF) is extremely rare. Case Report: A previously healthy 26-year-old male was injured with an abdominal stab wound. Computed tomography (CT) showed liver injury, pancreas injury and a retropancreatic hematoma. We performed the hemostasis of the bleeding due to the liver injury, a distal pancreatectomy with splenectomy and evacuation of the retropancreatic hematoma. On the 5th postoperative day, an abdominal bruit and thrill was detected. CT and angiography showed an AVF between the superior mesenteric artery (SMA) and the inferior mesenteric vein with early enhancement of the portal vein (PV). The point of the AVF was about 4 cm from the SMA's orifice. After an emergent laparotomy and inframesocolic approach, the isolation of the SMA was performed by dissection and ligation of adjacent mesenteric tissues which was about 6 cm length from the nearby SMA orifice, preserving the major side branches of the SMA, because the exact point of the AVF could not be identified despite the shunt flow in the PV being audible during an intraoperative hand-held Doppler-shift measurement. After that, the shunt flow could not be detected by using an intraoperative hand-held Doppler-shift measuring device. CT two and a half months later showed no AVF. There were no major complications during a 19-month follow-up period. Conclusion: Early management of a post-traumatic mesenteric AVF is essential to avoid complications such as hemorrhage, congestive heart failure and portal hypertension.

• 한국진공학회지
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• 제17권3호
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• pp.234-239
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• 2008

휴대용 XRF (X-Ray Fluorescence) 장치에 적용할 수 있는 40 kV용 투과 양극형 W-Target tube와 Rh-Target tube를 개발하고 특성을 조사하였다. 특성 x-ray의 에너지와 연속 x-ray의 선량특성은 알려진 결과와 잘 일치함을 확인하였고, 최대 선량을 추출하기 위한 양극금속 박막의 최적 두께는 W-target tube의 경우 약 $2.6{\mu}m$, Rh-target tube의 경우 약 $2.7{\mu}m$ 임을 밝혀내었다. 또한 관전압 40 kV, 관전류 $60{\mu}A$로 30분 동안 연속적으로 작동시켰을 때 양극에서의 온도는 $50^{\circ}C$를 넘지 않아 휴대용 XRF장치에 적용할 수 있음을 확인하였다.

• 한국진공학회지
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• 제17권3호
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• pp.247-252
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• 2008

휴대용 XRF(X-Ray Fluorescence) 장치에 적용하기 위하여 개발한 투과 양극형 x-ray tube를 이용하여 XRF 실험을 하고, x-ray tube가 XRF data에 미치는 영향을 조사하였다. W-target tube와 Rh-target tube를 이용하여 측정한 XRF data는 알려진 결과와 잘 일치하였다. 35 kV와 관전압과 $40{\mu}A$의 관전류에서 W-target tube로 측정한 Fe $K_{\alpha}$-line의 FWHM은 약 180 eV로써, 이 값은 물질의 성분분석을 하기에 충분한 것으로 확인하였다. XRF data와 x-ray tube의 적분강도 곡선을 비교 분석해 본 결과, 휴대용 XRF 장치에는 W-Target tube보다는 Rh-Target tube를 사용하는 것이 더 유리함을 밝혀내었다.

• 자원환경지질
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• 제37권2호
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• pp.235-244
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• 2004

북동태평양 심해저퇴적물 전단강도 측정의 정확성을 위하여 측정 방법에 따른 전단강도 측정 결과들을 비교하였다. 비교 항목들은 1) 동일한 시료를 두 종류의 베인 전단강도 측정기(수동 베인, 전동 베인)를 이용하여 측정한 결과, 2) 시료채취 후 즉시 선상에서 측정한 결과와 3개월 뒤 육상의 실험실에서 측정한 결과, 3) 동일한 정점에서 채취된 두개시료를 측정한 결과, 그리고 4) 동일한 코어 내에서 4회 반복 실험한 결과이다. 측정 결과, 전단강도 값은 퇴적깊이에 따라 뚜렷한 변화 양상을 보였다. 또한, 동일한 정점에서 채취한 두개의 코어 퇴적물에 대한 전단강도를 비교한 결과, 두 시료에서 측정된 변화폭이 장비차이에 따른 변화와 보관 조건에 의한 변화보다 높게 나타났다. 이와 같은 결과는 퇴적 깊이에 따른 전단강토의 변화가 지질공학적 물성변화에 의해 야기되었음을 지시한다.