• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2016년도 제54차 하계학술대회논문집 24권2호
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• pp.243-244
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• 2016

은행거래를 하려면 Active X를 기반으로 하는 보안 통합설치프로그램, 공인인증 보안프로그램, 개인 PC방화벽 프로그램 등 보안에 필요한 프로그램을 설치해야한다. 그러나 Active X의 보안취약점으로 앞으로 나올 브라우저에서는 Active X대신 웹 표준 모듈을 기반으로 하는 보안 시스템을 제공하고 있다. 본 논문은 Active X를 대체할 수 있는 것으로 웹 표준 모델에 근거한 QR코드 및 지문인식을 통한 인증을 제안한다. 본 논문에서 제안한 시스템을 적용한다면, 보다 안전한 은행거래를 하는데 도움을 줄 수 있다.

• 공업화학
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• 제3권3호
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• pp.516-521
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• 1992

키틴에 산화프로필렌을 반응시켜 키틴의 수산기에 히드록시프로필기가 치환된 히드록시프로필 키틴(HPCH)을 합성하였다. 여러가지 유기 용매중에서 키틴과 그 유도체의 용해성 시험에서 HPCH가 키틴보다 용해성이 향상되었으며 포름산에서 가장 좋은 용해성을 나타내었다. 포름산을 용매로 HPCH용액을 제조하여 농도를 변화시키면서 편광현미경으로 관찰한 결과 30 wt% 이상의 농도에서 지문형태의 복굴절 현상이 나타났으며, 열분석기(DSC)의 분석에서 열적 특성피크는 관찰되지 않아서 HPCH는 콜레스테릭 구조를 갖는 유방성 액정을 확인할 수 있었다.

• 한국정보통신학회논문지
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• 제21권3호
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• pp.636-642
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• 2017

본 논문은 동심원 확장 및 추적 기법을 이용하여 손동작을 인식하는 알고리즘을 제안한다. 제안하는 알고리즘은 웹 카메라로부터 영상을 입력받아 전처리 과정을 통해 손 영상에 대한 ROI를 추출한 뒤 동심원을 사용하여 펴진 손가락의 개수뿐만 아니라 손가락의 끝점, 손가락의 기저의 위치정보, 손가락 사이의 각도를 추출하여 HCI분야에서 활용할 수 있는 다양한 입력 방법을 제공한다. 또한 이 알고리즘은 이미지 전체의 화소를 참조하는 래스터 스캔방식과 비교하여 동심원을 구성하는 화소만을 참조함으로서 계산복잡도를 줄일 수 있다. 제안하는 알고리즘은 9가지의 손동작을 평균 90.7%의 인식률과 평균 78ms의 수행속도를 보여줌을 확인했고, 가상현실, 증강현실 및 혼합현실 그리고 HCI 분야 전반의 입력수단으로의 적용가능성을 확인하였다.

• 대한자기공명의과학회:학술대회논문집
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• 대한자기공명의과학회 2001년도 제6차 학술대회 초록집
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• pp.111-111
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• 2001

목적： To evaluate the feasibility of the event-related functional MR study using power grip studying the hand motor system 대상 및 방법： Event-related functional MRI was performed on a 1.5T MR unit in seven norm volunteers (man=7, right-handedness=2, left-handedness=5, mean age： 25 years). A single-shot GRE-EPI sequence (TR/TE/flip angle： 1000ms/40ms/90, FOV = 240 mm matrix= 64$\times$64, slice thickness/gap = 5mm/0mm, 7 true axial slices) was used for functiona MR images. A flow-sensitive conventional gradient echo sequence (TR/TE/flip angl 50ms/4ms/60) was used for high-resolution anatomical images. To minimize the gross hea motion, neck-holders (MJ-200, USA) were used. A series of MR images were obtained in axial planes covering motor areas. To exclude motion-corrupted images, all MR images wer surveyed in a movie procedure and evaluated using the estimation of center of mass of ima signal intensities. Power grip task consisted of the powerful grip of all right fingers and hand movement ta used very fast right finger tapping at a speed of 3 per 1 second. All tasks were visual-guid by LCD projector (SHARP, Japan). Two tasks consisted of 134 phases including 7 activatio and 8 rest periods. Active stimulations were performed during 2 seconds and rest period were 15 seconds and total scan time per one task was 2 min 14 sec. Statistical maps we obtained using cross-correlation method. Reference vector was time-shifted by 4 seconds an Gaussian convolution with a FWHM of 4 seconds was applied to it. The threshold in p val for the activation sites was set to be 0.001. All mapping procedures were peformed usin homemade program an IDL (Research Systems Inc., USA) platform. We evaluated the activation patterns of the motor system of power grip compared to hand movement in t event-related functional MRI.

• Journal of Yeungnam Medical Science
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• 제2권1호
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• pp.259-264
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• 1985

신경아세포종은 소아기에 발생하는 악성종양중 뇌종양 다음으로 흔히 발생하는 것으로 원발 혹은 전이된 부위에 따라 다양한 임상증상이 나타날 수 있으나 실명을 주소로 한 경우는 드물다. 본 증례는 4세된 남아의 복부에서 기원하여 사골동으로 원위전이하여 갑작스런 실명을 주소로 한 신경아세포종으로 cytoxan, vincristine, DTIC, adriamycin 및 VM-26의 병합요법으로 치료하여 실명은 그대로 있으나 복부와 사골동의 종괴는 현저히 감소하였고 환아는 건강이 양호한 상태이다.

• Journal of Korean Neurosurgical Society
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• 제58권3호
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• pp.291-293
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• 2015

Anterior communicating artery (ACoA) aneurysms sometimes present with visual symptoms when they rupture or directly compress the optic nerve. Giant or large ACoA aneurysms producing bitemporal hemianopsia are extremely rare. Here we present an unusual case of bitemporal hemianopsia caused by a large intracranial aneurysm of the ACoA. A 41-year-old woman was admitted to our neurosurgical department with a sudden-onset bursting headache and visual impairment. On admission, her vision was decreased to finger counting at 30 cm in the left eye and 50 cm in the right eye, and a severe bitemporal hemianopsia was demonstrated on visual field testing. A brain computed tomography scan revealed a subarachnoid hemorrhage at the basal cistern, and conventional cerebral catheter angiography of the left internal carotid artery demonstrated an $18{\times}8mm$ dumbbell-shaped aneurysm at the ACoA. Microscopic aneurysmal clipping was performed. An ACoA aneurysm can produce visual field defects by compressing the optic chiasm or nerves. We emphasize that it is important to diagnose an aneurysm through cerebrovascular study to prevent confusing it with pituitary apoplexy.

• 대한의용생체공학회:의공학회지
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• 제28권1호
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• pp.132-138
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• 2007

MR(magnetic resonance) image of moving organ such as heart shows serious distortion of MR image due to motion itself. To eliminate motion artifacts, MRI(magnetic resonance imaging) scan sequences requires a trigger pulse like ECG(electro-cardiography) R-wave. ECG-gating using cardiac cycle synchronizes the MRI sequence acquisition to the R-wave in order to eliminate image motion artifacts. In this paper, we designed ECG/PPG(photo-plethysmography) gating system which is for eliminating motion artifacts due to moving organ. This system uses nonmagnetic carbon electrodes, lead wire and shield case for minimizing RF(radio-frequency) pulse and gradient effect. Also, we developed a ECG circuit for preventing saturation by magnetic field and a finger plethysmography sensor using optic fiber. And then, gating pulse is generated by adaptive filtering based on NLMS(normalized least mean square) algorithm. To evaluate the developed system, we measured and compared MR imaging of heart and neck with and without ECG/PPG gating system. As a result, we could get a clean image to be used in clinically. In conclusion, the designed ECG/PPG gating system could be useful method when we get MR imaging of moving organ like a heart.

• Journal of Electrical Engineering and Technology
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• 제8권3호
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• pp.633-637
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• 2013

A wide range of applications for Foot Print Recognition System is discussed in this paper. The whole concept works under the principle that foot print is a parameter associated with biometrics that is very common as well as distinct. Its foremost application is at the government hospitals in the under developed and third world nations where there aren't the best of facilities. This system can be applied in the maternity ward of the hospitals for the identification or differentiation of the infants. Till date there has been no specialized system adopted for this purpose. The Foot Print Recognition System will overcome all the defects of any biometrics when applied here. Since the child will be very delicate for an iris scan and it will not be able to open its eyes wide or to correctly place its finger print on the sensor since the hands of a new born infant will be closed for a while. The Foot Print Recognition system can also be implemented in temples where there are cases of theft often reported. This can be used to grant access to the karpagraham of the deity by authorized users alone. These 2 applications of FPRS are discussed in this paper.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1373-1377
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• 2003

Current prostheses for amputees are generally extrinsic wearing socket type that the coupling between body stump and appliance wraps the soft tissue and this structure causes several problems :applying direct weight to soft tissue such as skin and muscle, skin trouble of contacting area and pain. In this study, osseointegration implant is a method to directly connect prosthesis to the residual stump skeletal tissue of arm, finger and leg through surgical operation. Technology presented in this paper essentially solves the problems of pain and abnormal weight transfer system indicated above and recovers the functions of the amputated arm and leg. In this paper, implant shape was designed for the first step for the development of osseointegration implant and then we studied the possibility to apply this osseointegration implant to human body by performing implant insertion operation to beagle tibia for the clinical animal test and normal beagle's gait analysis was executed in order to quantitatively verify the beagle's skeletal functions after the implant insertion.

• Archives of Plastic Surgery
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• 제36권1호
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• pp.84-88
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• 2009

Purpose: Compression of the ulnar nerve in the ulnar tunnel is a relatively uncommon condition. Many authors have described several etiologies of ulnar nerve compression. We experienced two cases of ulnar nerve compression in the ulnar tunnel due to an anomalous pulsatile S - shaped ulnar artery. Methods: Case 1: A 51 - year - old man was referred with numbness and paroxysmal tingling sensation along the volar side of the ring and little fingers of his right hand for 6 months. When exploration, the ulnar artery was pulsatile S - shaped and was impinging on the ulnar nerve. To decompress the ulnar nerve, the tortuous ulnar artery was mobilized and translocated radially onto the adjacent fibrous tissue. Case 2: A 41 - year - old man was referred with tingling sensation on the 4 th, 5 th finger of the right hand for 4 months. Sensory nerve conduction velocities of the ulnar nerve was delayed. Preoperative 3D angio CT scan showed an anomalous S - shaped ulnar artery. Same operation was done. Results: The postoperative course was uneventful. After decompression, paroxysmal tingling sensation decreased to less than 1 minute per episode, occurring 1 - 2 times a day. After 4 months, they had no more episodes of numbness and tingling sensation. Examination demonstrated good sensation to pinprick and touch on the ulnar aspect of the hand. Conclusion: We report two cases of ulnar nerve compressive neuropathy that was caused by an anomalous pulsatile S - shaped ulnar artery in the ulnar tunnel. Although this is an unusual cause of ulnar nerve compression, the symptoms will not spontaneously resolve. The prompt relief of compressive neuropathic symptoms following the translocation of the impinging ulnar artery from the affected ulnar nerve onto adjacent tissue proved that the ulnar nerve compression is due to the anomalous vessel.