• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제6권9호
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• pp.437-444
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• 2017

영화 매출에 대한 연구가 많이 있었지만 공통적인 핵심주제는 영화 매출에 대한 효율적인 예측모델을 훈련하는 것이다. 그러나 과거의 연구에서는 예측 오차를 발생시키는 요인에 대한 분석이 부족하여 이러한 오차를 줄이는 방법에 대한 연구가 이루어지지 않았다. 본 연구에서는 같은 시기에 개봉되고 있는 영화들 간의 영향이 예측 오차에 대한 주요인이라는 가정하에 한 영화가 다른 경쟁영화에서 영향을 받는 정도(경쟁값)를 분석하여 영화매출예측 성능을 향상시키는 것을 목표로 한다. 경쟁값을 예측하기 위하여, 먼저 경쟁값의 극성(양수/음수)에 대해 분류하고 양수의 확률과 음수의 확률을 계산한 다음 회귀분석을 이용하여 양수인 값과 음수인 값을 예측한다. 마지막으로, 확률값과 예측값을 통하여 경쟁값의 기댓값을 계산하여 초기 예측된 매출을 보정한다. 실험 결과에 의하면 제안 방법을 통하여 영화 매출 예측의 정확도가 향상됨을 알 수 있었다.

• Journal of Trauma and Injury
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• 제20권2호
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• pp.144-148
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• 2007

Purpose: The management of hemorrhagic shock is critical for trauma patients. To assess hemorrhagic shock, the clinician commonly uses a change in positional blood pressure, the shock index, an estimate of the diameter of inferior vena cava based on sonography, and an evaluation of hypoperfusion complex shown on a CT scan. To add the finding for the hypoperfusion complex, the 'halo sign' was introduced recently. To our knowledge, this 'halo sign' has not been evaluated for its clinical usefulness, so we designed this study to evaluate its usefulness and to find the useful CT signs for hypoperfusion complex. Methods: The study was done from January 2007 to May 2007. All medical records and CT images of 124 patients with trauma were reviewed, of which 103 patients were included. Exclusion criteria was as follows: 1) age < 15 year old and 2) head trauma score of AIS ${\geq}$ 5. Results: The value of kappa, to assess the inter-observer agreement, was 0.51 (p < 0.001). The variables of the halo-sign-positive group were statistically different from those of the halo-sign-negative group. The rate of transfusion for the halo-sign-positive group was about 10 times higher than that of the halo-sign-negative group and the rate of mortality was about 6 times higher. Conclusion: In the setting of trauma, early abdominal CT can show diffuse abnormalities due to hypoperfusion complex. Recognition of these signs is important in order to prevent an unwanted outcome in hemorrhagic shock. We conclude that the halo sign is a useful one for hypoperfusion complex and that it is useful for assessing the degree of hemorrhagic shock.

• 대한영상의학회지
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• 제81권5호
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• pp.1194-1203
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• 2020

목적 본 연구의 목적은 수술 전 표재성 방광암(T1 또는 그 이하 병기)을 확인하기 위한 자기공명영상의 stalk sign 및 inchworm sign의 진단적 능력을 평가하는 것이다. 또 다른 목적은 두 sign 간의 진단적 능력의 차이를 비교하는 것이다. 대상과 방법 방광전절제술을 시행 받은 총 240명의 환자들(505개의 종양들)을 후향적으로 검토하였다. 모든 종양은 3.0 테슬러 자기공명영상에서 T2 강조영상의 stalk sign 또는 확산강조영상의 inchworm sign을 발견함으로써 표재성 종양 및 침윤성 종양으로 분류하였다. 이를 수술 후 병리학적 T 병기와 비교함으로써 통계학적으로 진단적 의의를 평가하였고 두 sign 간의 진단적 능력 차이를 비교하였다. 결과 Stalk sign 및 inchworm sign은 높은 특이도(93%, 91%), 양성예측도(89%, 90%), 정확도(70%, 74%)를 보였으나 낮은 민감도(54%, 61%)와 음성예측도(60%, 63%)를 보였다. 두 sign 간의 진단적 능력에서 통계학적 유의미한 차이는 없었다(p > 0.05). 결론 수술 전 T2 강조영상의 stalk sign과 확산가중영상의 inchworm sign을 발견함으로써 표재성 방광암을 쉽게 진단할 수 있다.

• 대한토목학회논문집
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• 제37권3호
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• pp.629-636
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• 2017

도시철도는 수도권 및 주요 광역지자체에서 버스와 함께 대표적으로 수도권 시민이 가장 많이 이용하는 교통수단이다. 그러나 관련 연구 결과를 살펴보면 안내표지에 대한 만족도는 낮고, 안내표지 개선의 경우 대부분 안내표지의 설치위치에 대해 안내표지가 많이 또는 적게 설치되어 있다는 것을 사진 분석 위주로 제시하고 있어 정량적인 분석 기법을 통한 문제점 도출 및 개선이 어려웠다. 따라서 본 연구에서는 Test-bed 역사(수서역)을 대상으로 환승 동선(분당선 ${\rightarrow}$ 3호선 방면)내 주요의사결정지점에서의 안내표지 정보부하 및 적정 설치위치를 Positive Guidance를 적용하여 평가하는 방안을 제시하였다. Positive Guidance는 운전자 측면에서의 제공되어야 하는 적정 정보량과 정보 제공 위치 선정을 평가하는 방법으로 FHWA에 의해 1973년에 처음으로 도입되었다. 해당 기법을 통한 평가 결과 해당 동선 내 주요 의사결정지점에서 동선 결정을 방해하는 요인(다수의 시인성 저하 시설물, 높은 안내표지 정보 부하량)이 많아 이용자들의 혼란이 발생하고 있었다. 따라서 환승 동선 내 결절점 중심으로 필요 정보를 제공해야 하며, 시거 방해 요인(높은 조도의 광고 표지, 원형기둥, 높은 천장 등)을 제거하기 위한 안내표지 설치 방안이 필요함을 도출하였다. 향후 안내표지 디자인 개선시 유니버설 디자인을 적용하여 모든 이용자들이 도시철도역사 이용시 불편함이 없도록 해야 할 것이며, 해당 연구는 향후 도시철도역사 안내표지의 적정성을 평가하는 정량적인 방법으로 안내표지 유형 및 배치에 중요한 기초자료로 활용 가능할 것이다.

• Bulletin of the Korean Chemical Society
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• 제34권12호
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• pp.3597-3601
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• 2013

The reactions of bis(Y-aryl) chlorothiophosphates (1) with substituted anilines and deuterated anilines are investigated kinetically in acetonitrile at $55.0^{\circ}C$. The Hammett plots for substituent Y variations in the substrates show biphasic concave upwards with a break point at Y = H. The cross-interaction constants (${\rho}_{XY}$) are positive for both electron-donating and electron-withdrawing Y substituents. The kinetic results of 1 are compared with those of Y-aryl phenyl chlorothiophosphates (2). The cross-interaction between Y and Y, due to additional substituent Y, is significant enough to result in the change of the sign of ${\rho}_{XY}$ from negative with 2 to positive with 1. The effect of the cross-interaction between Y and Y on the rate changes from negative role with electron-donating Y substituents to positive role with electron-withdrawing Y substituents, resulting in biphasic concave upward free energy correlation with Y. A stepwise mechanism with a rate-limiting leaving group departure from the intermediate involving a predominant frontside attack hydrogen bonded, four-center-type transition state is proposed based on the positive sign of ${\rho}_{XY}$ and primary normal deuterium kinetic isotope effects.

• Bulletin of the Korean Chemical Society
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• 제35권6호
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• pp.1754-1758
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• 2014

The nucleophilic substitution reactions of bis(Y-aryl) chlorothiophosphates (1) with X-pyridines are investigated kinetically in acetonitrile at $35.0^{\circ}C$. The free energy relationships with both X and Y are biphasic concave upwards with a break point at X = 3-Ph and Y = H, respectively. The sign of cross-interaction constants (CICs; ${\rho}_{XY}$) is positive with all X and Y. Proposed mechanism is a stepwise process with a rate-limiting leaving group departure from the intermediate with all X and Y. The kinetic results of 1 are compared with those of Y-aryl phenyl chlorothiophosphates (2). In the case of Y = electron-withdrawing groups, the cross-interaction between Y and Y, due to additional substituent Y, is significant enough to change the sign of ${\rho}_{XY}$ from negative with 2 to positive with 1, indicative of the change of mechanism from a rate-limiting bond formation to bond breaking.

• 한국임상수의학회지
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• 제36권5호
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• pp.282-284
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• 2019

A 8-year-old, intact female, 2.1 kg, yorkshire terrier dog was referred to Animal Medical Center, Chonbuk National University due to right hindlimb lameness. Orthopedic examinations revealed pain during extension and flexion on stifle joint, positive cranial drawer sign, positive tibial compression test and patella luxation. Radiography showed the cranial displacement of right tibia with mildly increasing the synovial volume. The surgical procedure involved radial osteotomy of the proximal tibia and fixation by 1.2 T-locking plate. At two weeks after surgery, the patient was able to weight-bearing and gait gradually improved. This case report describes circular Tibial Tuberosity Advancement (cTTA) surgical technique and the successful surgical repair of cranial cruciate ligament rupture a dog.

• 천문학회지
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• 제36권spc1호
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• pp.7-12
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• 2003

We have studied the magnetic helicity of active regions by using the data from (1) the photo-electric magnetograph of the Okayama Observatory (1983-1995) and (2) the video magnetograph of NAOJ/Mitaka (1992-2000). The latitude distribution of helicity showed a tendency that the regions in the north (south) hemisphere have negative (positive) helicities, respectively, which is already known as the hemispheric sign rule. If we look into the sign of helicity as a function of time, the sign rule was less definite or was reversed sometimes in the sunspot minimum phase. We also studied the relation between the magnetic helicity and the sunspot tilt angles, and found that these two quantities are positively correlated, which is opposite to the expectation of a theoretical model. The implications of this cycle-phase dependence of helicity signs and the correlation between magnetic he Ii city and sunspot tilt angles are discussed.

• Journal of Korean Neurosurgical Society
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• 제55권5호
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• pp.296-299
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• 2014

We report a rare case of pronator teres syndrome in a young female patient. She reported that her right hand grip had weakened and development of tingling sensation in the first-third fingers two months previous. Thenar muscle atrophy was prominent, and hypoesthesia was also examined on median nerve territory. The pronation test and Tinel sign on the proximal forearm were positive. Severe pinch grip power weakness and production of a weak "OK" sign were also noted. Routine electromyography and nerve conduction velocity showed incomplete median neuropathy above the elbow level with severe axonal loss. Surgical treatment was performed because spontaneous recovery was not seen one month later.

• Journal of Information Technology Applications and Management
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• 제23권3호
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• pp.87-97
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• 2016

This paper proposes a fast sound source localization method using a TDOA sign-based algorithm. We present an L-shaped microphone set-up which creates four major regions in the range of $0^{\circ}{\sim}360^{\circ}$ by the intersection of the positive and negative regions of the individual microphone pairs. Then, we make an initial source region prediction based on the signs of two TDOA estimates before computing the azimuth value. Also, we apply a threshold and angle comparison to tackle the existing front-back confusion problem. Our experimental results show that the proposed method is comparable in accuracy to previous three microphone array methods; however, it takes a shorter computation time because we compute only two TDOA values.