• 대한관절경학회지
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• 제2권1호
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• pp.45-50
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• 1998

Recently, a variety of arthroscopic techniques have been reported for the treatment of the displaced tibial eminence fracture. The purpose of this study was to describe details of arthroscopic technique using pull-out wire and to evaluate the results. Eleven patients with irreducible type II and type III tibial eminence fractures underwent the arthroscopic reduction and internal fixation using double strand pull-out wiring. The anterior cruciate ligament tibial drill guide was utilized for the reduction of fracture and passage of the guide pins. The tibial eminence fracture was firmly fixed with double strand 26-gauge pull-out wire(0.45mm diameter). Fracture union was achieved at 7.2 weeks (range, six to eight weeks) after operation. All cases were united at the last follow-up. Subjectively, nine patients had no pain and no restriction of daily activities. Two patients with combined injuries had limitation of knee motion(10 to 130 degrees, respectively) and one patient showed mild anterior laxity. Early rehabilitation was enabled without loss of reduction and breakage of pull-out wire. The arthroscopic reduction and internal fixation using pull-out wire showed good results including early rehabilitation, early fracture union, minimal morbidity, and no requirement of the second operation for hard ware removal.

• 한국임상수의학회지
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• 제39권6호
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• pp.294-301
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• 2022

Three-dimensional (3D) printing technique has been widely used for accurate screw and pin placement in orthopedic surgery and neurosurgery. However, there are few reports comparing the accuracy between the patient-specific guides and freehand Kirschner wire (K-wire) placement in toy, small and medium breed dogs. This study aimed to assess the accuracy of 3D printed patient-specific guides (PSGs) in pin insertion in the thoracolumbar vertebrae of toy breed dogs and compare the outcomes between novice and experienced surgeons. The experiment was conducted on the thoracolumbar vertebrae of 21 euthanized toy breed dogs (median weight, 5.95 kg). The optimal insertion angle placement was determined and patient-specific guides for K-wire insertion were designed and 3D printed using computed tomography (CT) and a 3D computer-aided design program of three vertebrae (Thoracic 12-Lumbar 1). K-wire tracts were made by experienced and novice surgeons and compared to assess the accuracy based on postoperative CT. Based on postoperative CT, in the experienced group, 61 out of 63 pins (96.8%) were fully contained inside the vertebral body and lamina, whereas two pins (3.2%) had perforated the vertebral canal (grade 3, 2-4 mm breach). However, all the pins in the novice group were fully contained. The use of 3D printed PSGs for pin insertion in the thoracolumbar region is an accurate and safe alternative to freehand screw placement by novice surgeons in toy, small and medium breed dogs. Operations with 3D printed PSGs allow novice surgeons to achieve better or similar outcomes in accurate placement of pin/screws in vertebrae.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.800-802
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• 2004

When an accident is happen due to using a bad Wire Compressor, some public resentments are caused and It cause lawsuit for we. In case, we will undergo a colossal financial loss. in addition to, Guide to improve quality of operation by using the number of times of pressing and pressing pressure with cooperative private enterprise. And because of needs for Thermal, Electrical and Chemical factor analysis of connection point of sleeve, expect to try improving problems of wire presser whole our company. We expect that reduce fault and save cost by this process. Consequently, we will prevent power losing and black out due to line faults by expulsion of inferiority equipment and prevent heating and line fault. This is possible using Alarming and Auto Locking Wire Compressor that is improve on this study.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.1071-1074
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• 1995

This paper proposes two directional bending actator using three link, two shape memory alloys(SMA) of coil-type springs and two guide wires. By the heating of two SMA springs sequentially, the bending and stretching of the actuator is possible. Bending angle, force and repeated bending motion of actuator were measured and characterized. The performance of the actuator has been characterized for the possible application for catheter.

• 설비공학논문집
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• 제20권4호
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• pp.238-244
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• 2008

This study investigates on the improvement of inhalation effect of hood which attached new device named as "gas-guide-device" in local exhaust ventilation system for the effective elimination of harmful material and dust in manufacturing factory. The gas-guide-device having a diamond shape is composed of width (b) and two sides of a device (X, Y) and its size is selected the industrial hood under application in manufacturing factory after due consideration. In order to investigate the effect of gas-guide-device, numerical and experimental study is performed that the flow velocity is calculated and is measured by a commercial program "COMSOL $Multiphysics^{TM}$" and a hot wire type of anemometer, respectively. The numerical and experimental results are revealed is a similar pattern and flow velocity has improved to hood attached gas-guide-device. Also, the numerical method and result is also verified the dependance. Moreover, the optimum shape and size of gas-guide-device is revealed that the width (b) and the ratio of two sides of gas-guide-device (X, Y) has 125mm and 4 to 6.

• 한국공작기계학회논문집
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• 제17권1호
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• pp.7-15
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• 2008

Currently existing high-accuracy and high-speed die sets used in reciprocal press create scratches at the surface of guide posts, steel balls, and bushes due to vertical movement of balls with point-contacts between inner surface of bushes and guide posts. Consequently, accuracy of the die set and the life span of the metal mold are reduced. However, those scratches could reduce the pre-load of the steel ball. This research designed and developed a groove-type die set which improves life span of the die set by eliminating point-contacts of steel balls with guide posts. The guide post consisted of a steel-ball retainer, a steel-ball retainer stopper, a guide bush, a guide pin, a snap ring, and a spring. The steel-ball retainer has 72 holes with 8 columns of 9 holes in each column. The inner surface of the guide bush was grinded(surface roughness: $Ra\;\\;0.2{\mu}m$, accuracy: $0\;{\sim}\;-0.002mm$) after NC turning and heat treatment. Also, a line of small intermediate pocket was processed inside of the guide bush for lubrication and elimination of foreign materials. Guide grooves of steel balls were processed using a wire EDM(Electrical Discharge Machining) after heat treatment. With such a design of the guide post stated above, loads against steel balls could be dispersed greatly by the line contacts through the guide groove between the guide post and the guide bush, and the life span of the guide post could be expanded semi-permanently.

• 인터넷정보학회논문지
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• 제17권1호
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• pp.101-107
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• 2016

최근 디지털 영상장비 개발 기술의 발전으로 인하여 중재 시술이 일반화되고 있다. 중재 영상시술은 미세한 카테터와 가이드와이어를 체내에 삽입하고 시술하는 기술적 특성으로 인하여, 시술의 효과와 안전성을 높이기위해서는 엑스선영상의 고화질이어야 한다. 이로인하여 방사선 피폭량이 증가하는 문제점을 갖고 있다. 따라서 엑스선 디텍터의 성능을 개선하는 연구가 활발하게 진행되고 있다. 또한, 혈관 조영술을 기반으로 한 중재시술은 참조 영상 처리와 3D 의료 영상처리 기술이 요구된다. 본 논문에서는 중재시술을 지원하기 위한 가이드 시스템을 제안하고자 한다. 뇌혈관질환의 중재시술에 기존 혈관조형검사기반의 2D 의료영상이 갖고 있는 문제점을 해결하고, 중재시술 도구인 카테터와 가이드와이어의 목표 병변까지 실시간 위치 추적과 최적의 경로를 안내 해주고자 한다. 이를 위한 전체 시스템은 의료영상 획득부와 영상처리부 그리고 디스플레이 디바이스부로 구성하였다. 그리고 제안한 시스템에서 제공하는 가이드서비스의 실험환경은 브레인 팬텀(Complete intracranial model with aneurysms, ref H+N-S-A-010)을 엑스선으로 촬영하면서 실험하였다. 그리고 참조 영상을 생성하기 위해서 라프라시안 알고리즘 기반의 뇌혈관 모델링과 DICOM에서 추출한 이미지 처리를 위해 Volume ray casting 기법을 적용하였다. 그리고 카테터와 가이드와이어의 위치추적과 경로 제공을 위해 $A^*$ 알고리즘을 적용하였다. 끝으로 제안한 시스템에서 제공하는 카테터와 가이드와이어의 위치추적 수행결과를 보인다. 제안한 시스템은 향후 중재시술에 유용한 안내 서비스를 제공할 것으로 기대하고 있다.

• 한국항공우주학회지
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• 제32권8호
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• pp.72-81
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• 2004

초고속 지상 운행체에 대한 풍동실험을 통하여 단단한 채널과 운행체 사이에 발생하는 공력 상호작용을 연구하였다. 풍동실험시 유속은 30m/see에서, 단위길이당 레이놀즈수는 $3.1{\times}10^5/m$였다. 가변지면과 안내로와 같은 실험장치들이 이 실험을 위해 사용되었다. 운행체는 지면과 운행체 사이의 거리가 가까워질수록, 안내로 사이의 간격이 좁아질수록 양력은 급격히 증가하였고, 항력은 미세하게 감소하였으며, 키놀이 모멘트는 억제되어 정안 정성을 증대시켰다. 연선을 사용한 유동가시화를 통하여 운행체가 채널 내를 운행할 때의 유동 특성을 채널이 없는 경우와 비교하였고 공력측정 결과를 뒷받침하였다. 채널 지연과 안내로의 영향으로, 운행체 하부에서의 유동은 날개의 익단판 외부로 흐르지 못하며, 이것이 운행체 양력증가의 주요 원인이 되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.258-260
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• 2007

Nowadays the automotive circuit design becomes more complicated a practical modern car circuit usually contains thousands of wires. So the error connection between connector and pins becomes more difficult to be located. This paper proposes a general way to locate all error wires in an automotive circuit design. Firstly, we give an exact definition of error wire to guide our job. This definition also composes the core part of our algorithm. Then we limit the area of the error wires by several steps. During these steps, we apply breadth-first search method to step over all wires under consideration of reducing time cost. In addition, we apply bidirectional stack technique to organize the data structure for algorithm optimization. This algorithm can get a result with all error wires and doubtful wires in a very efficient way. The analysis of this algorithm shows that the complexity is linear. We also discuss some possible improvement of this algorithm.

• 한국안전학회지
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• 제23권2호
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• pp.1-6
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• 2008

The present study investigates on improvement of inhalation efficiency of hood in ventilation system for elimination of industrial dust. The hood, one of local exhaust ventilation system, has an important function to inhale a pollution source such as harmful dust and industrial waste. In this study, in order to improve the inhalation efficiency of the industrial hood, a new device named "gas-guide-device" was attached to inside of hood. The thermal fluid commercial code "Phoenics ver 3.1" was used to analyze the flow velocity distribution at the hood inlet and around the hood after gas-guide-device was installed. And the flow velocity on each position inside and around the hood was actually measured using the hot wire type anemometer under the same condition as that of numerical analysis. Also, in order to identify the optimum shape of gas-guide-device, numerical analysis and experiments are performed under various conditions and their results are presented. The results of this study revealed that the hood attached with gas-guide-device was higher the inhalation efficiency than that for without one and can be possible to improve the capture velocity of the industrial dust. And the optimum shape of gas-guide-device was identified that the ratio of two sizes of gas-guide-device, X to Y, has 4 to 6 on the basis of the hood size in use and the width (b) of gas-guide-device.