• 한국콘텐츠학회논문지
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• 제20권10호
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• pp.702-714
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• 2020

주식 투자는 재테크의 하나로 금리 인하와 비과세 제도의 축소에 따라 주목을 받기 시작했다. 그러나 투자에 전문적인 지식이 필요할 뿐 아니라 위험 부담이 크다는 단점이 있다. 따라서 주가 경향의 정확한 예측은 개인투자자에게나 주식 투자 관련 서비스를 제공하는 회사에 중요한 능력이며, 더욱 정확한 예측을 위한 연구가 활발히 진행 중이다. 그러나 예측 연구들의 공정한 비교와 최고의 예측 모델을 얻기 위한 하이퍼-파라미터의 최적화에는 예측 모델의 성능을 정확하게 평가하는 방법이 필요한데, 지금까지 예측 모델의 성능 평가에 대한 연구는 미진한 상태이며, 기존 방법들을 그대로 답습하고 있는 실정이다. 이에 본 논문에서는 주가 예측 모델 성능 평가를 측정기준과 데이터 구성의 관점에서 분석하고, 예측 불균형 비율을 이용한 주가 경향 예측 모델의 공정한 성능 평가 방법을 제안한다.

• 한국멀티미디어학회논문지
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• 제7권3호
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• pp.388-398
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• 2004

본 논문은 인터넷 상의 다수의 참여자가 분산가상환경에서 협업을 수행하는 경우 발생되는 전송 메시지트래픽을 조절하는 기법에 초점을 맞추고 있다. 가상환경에서 교환되는 정보의 양을 줄이는 방법을 상태 갱신메시지 필터링 기법이라고 부르며 이는 가상환경의 확장성을 향상시키는데 필수적인 처리과정이다. 대표적인 필터링 방법인 공간분할 기법은 전체 환경에서 작은 관심영역으로 분할하여 일관성이 유지되어야 하는 영역의 크기를 조절하는 방법을 사용하여 메시지 트래픽을 줄인다. 기존의 공간분할 기법은 시뮬레이션 이전에 관심영역에 대한 정보가 결정되어 사용되므로 동적 환경변화에 대한 적응성과 융통성이 부족하다는 단점을 가지고 있다. 본 논문에서는 관심영역 관리방법을 시스템 수행중에 재구성함으로써 적응성을 높인 동적 관심 영역 모델을 제안하고자 한다. 환경변화요소를 반영하기 위하여 제안된 모델은 관심영역의 다중분할과 다중 일관성 유지 알고리즘의 사용하여 효율적인 시스템 자원 소비를 가능하게 하였다. 제안된 기법의 성능평가를 위하여 가상으로 아바타의 행위를 발생시키고 갱신 메시지 트래픽을 측정하여 기존 모델과 비교하였다. 결론적으로, 제안된 모델은 다수의 참여자의 수용이 요구되는 MMORPG나 가상커뮤니티 시스템의 관심 영역 관리 시스템에 활용될 수 있다.

• Journal of Korean Neurosurgical Society
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• 제42권1호
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• pp.16-19
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• 2007

Objective : This report describes the clinical study of the surgical method of lateral third infraclavicular implantation of vagal nerve stimulation (VNS) generator through the axillary wrinkle incision. Methods : In a retrospective study, the data for 20 patients with medically intractable epilepsy treated by this approach were examined. The mean age was 31.4 years (range : 14-50), and the mean follow-up period was 12.15 months (range : 4-21 months). The male to female ratio was 2.3 : 1. The subcutaneous pocket for the generator was located in the lateral third infraclavicular area through the axillary wrinkle. Our method was a modification of the standard VNS generator implantation in the mid-infraclavicular pocket through anterior axillary incision. Results : There were the excellent or good cosmetic satisfaction in 95% of the cases and fair in 5%. The generator was located outside the lung field in 15%, periphery of the lung field in 45%, and crossed over the lung field in 40%. Discomfort from shoulder motion occurred transiently in 35% of cases. Other complications were minimal. Conclusion : These results demonstrate that the lateral third infraclavicular apporach will offers cosmetic benefits and reduction of obscuration of the lung field without serious complications. Thus, this technique provides an attractive alternative among the surgical techniques for the vagal nerve stimulation.

• 한국통신학회논문지
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• 제30권9C호
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• pp.922-929
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• 2005

본 논문에서는 SpPCA와 MLP에 기반을 둔 융합법칙에 의한 MRS 패턴분류기법을 제안한다. 차원축소를 위해 사용되는 기존의 PCA 기법은 입력데이터가 비선형 특성을 갖는 경우 최적의 변환행렬을 구할 수 없다는 문제점을 가지고 있다. 따라서, 본 논문에서는 구간별로 입력데이터를 분할한 후 PCA에 의해 특징을 추출하는 SpPCA 기법을 이용하여 입력패턴의 차원을 축소한다. 다음 단계인 분류단계에서는 MLP 비선형분류기를 이용하여 구간마다 추출된 특징벡터를 이용하여 기준패턴과의 유사도를 산출한다. 최종 분류단계에서는 MLP에 의해서 산출된 유사도에 기반을 둔 융합법칙에 의하여 MRS 패턴을 분류한다. 제안된 방법의 유용성을 보이기 위한 실험결과에서 기존의 방법들에 비해서 향상된 인식결과를 보임을 확인하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제29권3호
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• pp.237-251
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• 2020

Purpose The research was studied the hierarchical Hangul emotion index by organizing all the emotions which SNS users are thinking. As a preliminary study by the researcher, the English-based Plutchick (1980)'s emotional standard was reinterpreted in Korean, and a hashtag with implicit meaning on SNS was studied. To build a multidimensional emotion dictionary and classify three-dimensional emotions, an emotion seed was selected for the composition of seven emotion sets, and an emotion word dictionary was constructed by collecting SNS hashtags derived from each emotion seed. We also want to explore the priority of each Hangul emotion index. Design/methodology/approach In the process of transforming the matrix through the vector process of words constituting the sentence, weights were extracted using TF-IDF (Term Frequency Inverse Document Frequency), and the dimension reduction technique of the matrix in the emotion set was NMF (Nonnegative Matrix Factorization) algorithm. The emotional dimension was solved by using the characteristic value of the emotional word. The cosine distance algorithm was used to measure the distance between vectors by measuring the similarity of emotion words in the emotion set. Findings Customer needs analysis is a force to read changes in emotions, and Korean emotion word research is the customer's needs. In addition, the ranking of the emotion words within the emotion set will be a special criterion for reading the depth of the emotion. The sentiment index study of this research believes that by providing companies with effective information for emotional marketing, new business opportunities will be expanded and valued. In addition, if the emotion dictionary is eventually connected to the emotional DNA of the product, it will be possible to define the "emotional DNA", which is a set of emotions that the product should have.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권7호
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• pp.335-343
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• 2006

We have designed the system that measure one channel ECG by two electrode and extract real-time EDR with more related resipiration and comportable to subject by using conductive textile. On the assumption that relation between RL electrode and potential measurement electrode is coupled with RC connected model, we designed RL drive output to feedback two electrode for reduction of common mode signal. The conductive textile which was used for two ECG electrode was offered more comfort during night sleep in bed than any other method using attachments. In the method of single-lead EDR, R wave point or QRS interval area could be used for EDR estimation in traditional method, it is, so to speak, the amplitude modulation(AM) method for EDR. Alternatively, R-R interval could be used for frequency modulation(FM) method based on Respiratory Sinus Arrhythmia(RSA). For evaluation of performance on AM EDR and FM EDR from 14 subject, ECG lead III was measured. Each EDR was compared with both temperature around nose(direct measurement of respiration) and respiration signal from thoracic belt(indirect measurement of respiration) on mean squared error(MSE), cross correlation(Xcorr), and Coherence. The upsampling interpolation technique of multirate signal processing is applied to interpolating data instead of cubic spline interpolation. As a result, we showed the real-time EDR extraction processing to be implemented at micro-controller.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.418-421
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• 2008

Wenchuan earthquake (Mw 7.9) occurred in Sichuan province, China, May 2008 had resulted in a huge fault displacement around the Lungmenshan fault. Preliminary results of the fault displacement observed by ALOS PALSAR interferometry are presented. The surface deformation by the Wenchuan earthquake was reported up to 10m consisting of thrust- and right-slip compnents. A significant reduction in ionospheric density was also reported. Twenty differential interferograms and twenty multiple aperture SAR interferometry (MAI) pairs were produced over four ALOS tracks. It was observed from differential interferograms that i) LOS deformation decreases steadily from northnorthwest of the Longmenshan fault to the fault, ii) the LOS deformation sharply increases at areas around the fault, and iii) the decrease of the LOS deformation is observed from the Longmenshan fault to the south-southeast of the fault. Horizontal movement of the reverse fault displacement can better be observed by MAI technique, and the MAI phases show that i) the south-southeast directional reverse fault displacement (negative along-track deformation for an ascending track) of the north-northwest block gradually increases to the Longmenshan fault, ii) the reverse fault movement of the south-southeast block is sharply reversed to the north-northwest of the fault, and iii) the northnorthwest movement gradually decreases to the south-southeast of fault. Although the Lonmenshan Fault line is a center of earthquake epicenter, the boundary of surface movement exists to the north-northeast of the fault. Since the ionosphere was not stable even forty days after the mainshock, MAI phases were seriously corrupted by ionospheric effect. It is necessary to acquire more data when the ionosphere recovered to a normal state.

• 대한견주관절학회:학술대회논문집
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• 대한견주관절학회 2009년도 제17차 학술대회
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• pp.174-174
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• 2009

The acromioclavicular-hook-plate is one of the surgical treatments for distal clavicle fracture and traumatic acromioclavicular (AC) joint dislocation. Although this procedure can obtain rigid and accurate anatomical reduction of the AC joint, secondary widening of the hook-hole in the acromion is often seen during postoperative follow-up. This complication is owing to the high-degree of mobility of the AC joint. Therefore, it is important to evaluate the effect on these complications due to the position of the hook-hole. The purpose of the present study is to investigate three-dimensionally the effect due to the position of the hook-hole during arm abduction motion. We studied in vivo and three-dimensional kinematics of the normal shoulder joint with use of a markerless bone-registration technique. Magnetic resonance images of 14 shoulders of 7 healthy volunteers were acquired in 7 positions between $0^{\circ}$ and $180^{\circ}$ of abduction. We created three-dimensional computer models of the bones and the acromioclavicular-hook-plate. Based on the three-dimensional kinematics data, we simulated the widening of the hook-hole each different positioning of the hook-hole. The widths of the hook-holes almost linearly increased. And these widths significantly increased, when we put the hook-hole on the acromion from AC joint to 20 mm and 25 mm posterior position.

• 한국항해항만학회지
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• 제34권2호
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• pp.131-136
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• 2010

The aim of the paper is to solve the problem of customer reduction due to the difficulty of parts sourcing which impacts production delay and delivery delay in SC networks. Furthermore, this paper is to suggest the new inventory policy of MTS in order to solve the problem of current inventory policy. In order to compare two policies, a LCD maker is selected as a case study and the real data for 2007 years is used for simulation input. The maker uses MTO policy for parts sourcing which has the problem of lead time even if it has some advantage of inventory cost. Based on current process. The simulation program of AS-IS model and TO-BE model using ARENA 10 version is developed for evaluation. In a result, the order number of two policies shows that MTO is 52 and MTS is 53. However the quantity of order shows big difference such that MTO is 168,460 and MTS is 225,106. Particularly, the lead time of new inventory policy shows much shorter that that of MTO such that MTO 100 is days and MTS is 16 days. In spite of short lead time by MTS policy, new policy has to take burden of inventory cost per year. Total inventory cost per year by MTS policy is US$ 11,254 and each part inventory cost is that POL is US$ 1,807, LDI is US$ 2,166 and Panel is US$ 7,281. The implication of the research is that the company has to consider the cost and the service simultaneously in deciding the inventory policy. In the paper, even if the optimal point of deciding is put into tactical area, the ground of decision is suggested in order to improve the problem in SC networks.

• 한국음향학회지
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• 제19권5호
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• pp.13-19
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• 2000

음성신호의 음소경계 추출방법 중 음소에 대한 사전지식 없이 음성 데이타, 혹은 특징벡터의 변화를 감지하여 음소경계를 추출해 내는 맹목 세그먼테이션은 연속음형 인식시스템이나 코퍼스 제작에 중요한 역할을 하며 많은 연구가 진행되어 왔다. 이러한 맹목 세그먼테이션 방법은 사전지식을 필요로 하지 않아 비교적 쉽게 접근할 수 있으나 음운학적인 지식, 또는 음소나 음소경계에 대한 지식과 경험 데이타 등을 이용하는 지식 기반 세그먼테이션 방법에 비해 성능이 좋지 못한 단점이 있다. 본고에서는 우리말의 연속 음성을 맹목 세그먼테이션해서 후보 경계를 추출한 다음, 음절핵의 위치정보를 이용하여 후보 경계를 후처리함으로써 세그먼테이션 효율을 높이는 방법을 제안한다. 제안하는 방법의 전처리과정에서는 확률적인 거리 모델을 이용한 클러스터링 방법을 이용하였으며, 후처리과정에서는 음절의 핵 사이에 위치할 수 있는 음소의 수는 제한된다는 선험적인 지식을 이용하였다. 실험결과, 제안하는 방법을 이용했을 때의 삽입오류는 맹목 세그먼테이션에 비해 약 25% 감소하였다.