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MCE 학습 알고리즘을 이용한 문장독립형 화자식별의 성능 개선
김태진,최재길,권철홍,Kim Tae-Jin,Choi Jae-Gil,Kwon Chul-Hong 대한음성학회 2006 말소리 Vol.57 No.-
In this paper we use a training algorithm, MCE (Minimum Classification Error), to improve the performance of a text-independent speaker identification system. The MCE training scheme takes account of possible competing speaker hypotheses and tries to reduce the probability of incorrect hypotheses. Experiments performed on a small set speaker identification task show that the discriminant training method using MCE can reduce identification errors by up to 54% over a baseline system trained using Bayesian adaptation to derive GMM (Gaussian Mixture Models) speaker models from a UBM (Universal Background Model).
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김태진,최승훈,황의호,Kim, Tae-Jin,Choi, Seung-Hoon,Hwang, Eui-Ho 대한소아외과학회 1999 소아외과 Vol.5 No.1
Neuroblastoma is a solid tumor derived from neural crest cells of the sympathetic nervous system. It is the most common extracranial solid tumor in children. Although it has the highest rate of spontaneous regression, it has a bad prognosis. Recent reports indicate a much improved outcomes utilizing the multitreatment approaches and early diagnosis as a result of patient screening. We have studied 42 patients managed in the last decade at the Severance and Yongdong Severance Hospitals. The patients were followed until January 1998 and analyzed in terms of age, sex, admission period, stage, diagnostic studies, clinical symptoms, physical findings, operative time, treatment modalities, and survival rate. Twenty eight patients underwent operative procedures, 16 patients had postoperative chemotherapy, and 19 patients had preoperative chemotherapy. Sexual difference was 1.33:1 in favor of males, and 43 % of patients were under one year of age. The patients were initially diagnosed as a result of symptoms and signs. An abdominal mass was the most common clinical finding. Eighty six percent of the patients were in advanced stages (>Stage III of INSS). The 2 year survival rate was 59.2 % and the 5 year survival rate was 29.6 %.
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김태진,권긍록,김형섭,우이형,Kim, Tae-Jin,Kwon, Kung-Rock,Kim, Hyeong-Seob,Woo, Yi-Hyung 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.4
연구목적: 본 연구에서는 한국인의 상하악 전치부간의 색조차이를 상하악 치아 순면의 정중부의 색조를 분광측색장치 (Spectrophotometer)를 이용하여 CIE $L^{*}a^{*}b^{*}$ 색체계로 비교분석을 하여, 실제 한국인의 상하악 전치부간의 색조차이에 관하여 알아보고 자 하였다. 연구대상 및 방법: 수복물이 없으며 치주적으로 건강한 정상적인 치관부의 형태의 상하악 12전치를 가진 20대, 30대, 40대, 50대 이상 10명씩 남녀 각 40명씩 총80명을 대상으로 색조 측정을 시행하였다. 연구재료: $SpectroShade^{TM}$ MICRO (MHT S.p.A., Italy) 디지털 색조 분석 기구로서 대상 치아의 디지털 영상을 채득하여 이를 기계 내에 포함된 색조 분석시스템을 통해 shade map의 형태로 입력 분석하여 주는 장치이다. 결론: 1. 전치부 상, 하악 치아간 색조차이는 중절치, 측절치, 견치 모두에서 ${\Delta}E^{*}$가 보다 큰 것으로 나타났다. 2. 상, 하악 견치 간 색조차이는 중절치, 측절치 간의 색조차이보다 더 두드러지고 중절치간 측절치간 색조차이 정도는 유사한 것으로 나타났다. 3. 남녀 성별에 따른 상, 하악 치아 간의 색조차이는 그 정도가 유사한 것으로 나타났다. 4. 각 연령대에 따른 상, 하악 치아간 색조차이의 정도는 연령대와 상관없이 유사한 것으로 나타났다. Purpose: The purpose of this study was to spectrophotometrically evaluate the shade difference between of maxillary and mandibular anterior teeth in the Korean by the standard of vita classical shade guide using $SpectroShade^{TM}$. Material and methods: In this study, the shades of healthy anterior teeth were examined and analyzed using the digital shade analysis of $SpectroShade^{TM}$. This study examined 80 individuals in their twenties, thirties, fourties, fifities ages and 40 males and 40 females, presenting 12 healthy, unrestored maxillary and mandibular anterior teeth. Tooth brushing and oral prophylaxis were performed prior to evaluation. The $SpectroShade^{TM}$ was used to acquire images of the 12 maxillary and mandibular anterior teeth. These images were analyzed using $SpectroShade^{TM}$ Software, and shade maps of each tooth were acquired. The shade difference of upper and lower, and gender differences and ages difference were investigated and analyzed with CIE $L^{*}a^{*}b^{*}$ color order system. One-Way ANOVA test was used to find out if there were significant differences between groups tested and Sheffe multiple comparison was used to identify where the differences were. Results: 1. Shade differences were significant (P < .05) between maxillary and mandibular central incisor, lateral incisor, canine. 2. No significant differences in shade distribution were seen between lateral incisors and central incisors. 3. Canine's shade difference were more significant than central incisor's and lateral incisors's. 4. No significant differences in shade distribution were seen between genders in maxillary and mandibulr central incisor, lateral incisor, canine. 5. No significant differences in shade distribution were seen in order of years in maxillary and mandibulr central incisor, lateral incisor, canine. Conclusions: The results of this study show that 1. Shade difference was founded in maxillary and mandibular anterior teeth and ${\Delta}E^{*}$ value was more than 2.0. 2. Canine's shade difference were more significant than central incisor's and lateral incisors's and between central incisors and lateral incisors shade differences were no significant. 3. No significant differences in shade distribution were seen between genders in maxillary and mandibular anterior teeth. 4. No significant differences in shade distribution were seen in order of years grade in maxillary and mandibular anterior teeth.
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김태진,박종원,조정혁,김희동,Kim, Tae Jin,Park, JongWon,Cho, Jeong Hyuk,Kim, Hee Dong 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.6
In this study, cyclic tests of beam-column connections composed with members applicable to the domestic low-middle rise steel buildings were conducted to develop seismic connection details and its evaluation. Connection types and material properties of the steel were testing variables and the difference between the newly developed seismic rolled section (SHN490) and existing rolled section (SM490) was also investigated. Distributions of the yield strength and the ultimate strength of the SHN490 rolled section were relatively uniform comparing to those of the SM490 rolled section Brittle fracture in the weldments of the test specimens was not observed. Instead, fracture occurred at heat-affected zones or the stress-concentrated point near the weld access hole of the beam flanges. In the case of identical rolled-section specimens, the rotational capacity and dissipated energy of the WUF-W connection was larger than those of the WUF-B connection. In the case of identical connection types, the rotational capacity and dissipated energy of the SHN490 section connection was larger than those of the WUF-B section connection. 국내 현실에 적합한 내진 접합부 상세 개발과 평가를 위하여 국내 중저층 철골건물에 적용되는 단면을 갖는 보와 기둥으로 구성 된 접합부 실험체를 선정하여 반복재하 실험을 수행하였다. 실험변수는 접합부 형식과 강종이며 새로 개발된 내진용 형강(SHN490)과 기존 형강 (SM490)의 성능 차이를 비교하였다. 소재인장시험결과에 의하면 SHN490 형강의 항복강도와 인장강도의 분포는 SM490형강의 분포보다 균일한 것으로 평가되었다. 접합부 실험체의 용접부에서의 취성파괴는 관찰되지 않았고 소정의 소성변형 능력을 발휘한 후 보 플랜지의 열영향부나 용 접접근공의 응력집중부위에서 파단이 발생하였다. 동일한 강종으로 구성된 실험체의 경우, 보의 웨브가 볼트에 의하여 기둥에 연결된 접합부 (WUF-B)보다는 용접에 의하여 연결된 접합부(WUF-W)의 회전과 에너지 소산능력이 더 컸다. 또한 동일한 접합부 형식의 실험체에서는 SM490 형강으로 구성된 실험체보다는 SHN490 실험체의 회전과 에너지 소산능력이 더 컸다.
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김태진,이찬호,Kim, Tae-Jin,Lee, Chan-Ho 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.2a
본 논문에서는 trace-back 동작 없이 디코딩이 가능한 변형된 레지스터 교환 (MRE) 방식을 블록 디코딩에 적용하여 전송 속도를 높이고 latency를 줄이는 비터비 디코딩 방식을 제안하였다. 변형된 레지스터 교환 방식을 블록 디코딩에 적용함으로써 디코딩 블록의 시작 상태를 결정하기 위해 필요한 동작 사이클을 줄여, 블록 디코딩을 사용하는 기존의 비터비 디코더보다 더 적은 latency를 가지게 되었다. 뿐만 아니라, 메모리를 더 효율적으로 사용할 수 있으면서 하드웨어의 구현에 있어서도 복잡도가 더 감소하게 된다. 또한 시작 상태를 결정하기 위해 필요한 trace-back 동작을 없애고 메모리를 줄여 이에 따른 전력 소모를 줄이는 저전력 동작이 가능하다. 제안된 방식은 같은 하드웨어 복잡도로도 메모리의 감소 또는 latency의 감소에 중점을 둔 설계가 가능하다. 또한, 몇 가지 디자인 파라미터를 변경하여 합성 단계에서 하드웨어 복잡도와 전송 속도를 Dade-off 할 수 있도록 스케일러블한 구조로 설계하였다. A high performance Viterbi decoder is designed using modified register exchange scheme and block decoding method. The elimination of the trace-back operation reduces the operation cycles to determine the merging state and the amount of memory. The Viterbi decoder has low latency, efficient memory organization, and low hardware complexity compared with other Viterbi decoding methods in block decoding architectures. The elimination of trace-back also reduces the power consumption for finding the merging state and the access to the memory. The proposed decoder can be designed with emphasis on either efficient memory or low latency. Also, it has a scalable structure so that the complexity of the hardware and the throughput are adjusted by changing a few design parameters before synthesis.
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