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프로토타입 기반 설명방식 모델에 적용되는 수치의 적합성에 관한 연구
주형준(Joo Hyung Jun),이정우(Lee Jung Woo) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
딥 뉴럴 네트워크 모델의 성능으로 인해 다양한 분야에서 활용되면서 모델의 결정을 설명하는 연구가 증가하고 있습니다. 본 논문에서는 프로토타입 기반 설명방식 모델을 사용하여 본질적으로 해석 가능한 분류 모델을 개발합니다. 저희 모델은 설명과 분류를 위해 입력 데이터와 프로토타입 사이의 거리를 사용합니다. 기존의 모델은 유클리드 거리를 기반으로 입력 데이터의 특성 벡터와 프로토타입 벡터의 차이를 사용하여 설명과 분류 작업을 진행하였습니다. 이러한 벡터 사이의 거리를 사용하는 모델의 경우 입력에 대해 불안정한 모습을 보이는 경우가 있습니다. 그렇기 때문에 저희는 기존의 벡터 형태의 프로토타입을 분포의 형태로 확장해 입력에 대해 더 안정적이고 정확한 판단을 내리는 모델을 개발했습니다. 벡터를 분포로 확장시킨 상황에서 두 분포의 거리를 측정하는 알맞은 수치를 사용하기 위해 다양한 수치들을 사용하고 실험을 통해 실제 적용된 수치들에 의한 결과를 통해 가장 알맞은 수치가 wasserstein 거리라는 것을 보입니다.
Improving Explainable Classification Networks by Maximizing Mutual Information
Joo Hyung Jun(주형준),Lee Jung Woo(이정우) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
Currently, deep learning is widely used in many fields. Many people who are fascinated by the accuracy and performance of deep learning are increasing their usage. But for this performance, we don’t know how the model makes choices. For this reason, more and more people have doubts about the model’s decision, and there are also more areas where the reason for the decision is needed for practical application. Accordingly, the interpretability and further explainability of the deep learning model are becoming important factors, and in this paper, we will talk about how to improve the existing explainable model. This paper deals with a method using mutual information and a method using representation learning. The method using representation learning showed higher performance than the existing model, and showed the importance of feature vector selection in an explainable model using a prototype vector. It is expected that this can be used in other types of explainable models that use prototypes.
우 Valsalva동에서 기시한 좌주관상동맥 기형과 합병된 동맥관개존증 1예
주형준 ( Hyung Joon Joo ),홍순준 ( Soon Jun Hong ),김진석 ( Jin Seok Kim ),박희남 ( Hui Nam Pak ),심완주 ( Wan Joo Shim ),신승용 ( Seung Yong Shin ),임도선 ( Do Sun Lim ) 대한내과학회 2008 대한내과학회지 Vol.74 No.2
선천성 관상동맥기형은 관상동맥조형술을 시행한 환자에서 약 0.5%로 발견되는 드문 질환이다. 하지만 주변구조물 및 주행경로에 따라 무증상에서 급사 및 심근 허혈등 다양한 임상경과를 나타낼 수 있다. 저자들은 이전에 동맥관개 존증으로 수술한 환자로 흉통을 호소하여 시행한 관상동맥 조형술에서 좌주관상동맥이 대동맥의 우 Valsalva동에서 우 관상동맥과 함께 기시하여, 정상보다 훨씬 긴 주행을 보이는 특이한 경우를 발견하여 보고하는 바이다. The finding of a left main coronary artery arising from the right sinus of Valsalva is a rare congenital anomaly. The clinical course of patients with a congenital anomaly of the coronary artery may be compromised depending on its anatomic relationship with adjunctive structures. Some anomalous origins of the left main coronary arteries arising from right aortic sinus of Valsalva have been associated with angina pectoris and sudden death, especially if their pathways are between the pulmonary artery and the aorta. We report a rare case with a combined congenital anomalous origin of the left main coronary artery arising with the right coronary artery simultaneously from the right aortic sinus of Valsalva in a patient with a patent ductus arteriosus. The left main coronary artery was extremely long because its pathway went in front of the pulmonary artery. There was no evidence of artherosclerosis or dynamic stenosis on the angiogram. (Korean J Med 74:188-191, 2008)
주형준(Hyung Jun Joo),고원욱(Won Ook Ko),박승근(Seung Keun Park),하태정(Tae Jung Ha),최성호(Sung Ho choi),송철수(Chul Soo Song),송근암(Guen Am Song),조몽(Mong Jo),양웅석(Ung Suk Yang),문한규(Han Kyu Moon) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.6
N/A Background/Aims: Carcinoma of the proximal bile ducts is a rare condition that occurs more frequently in men than in women. The majority of patients present with obstructive jaundice and the main aim of treatment should be to relieve jaundice while at the same time, if possible, removing the tumor. However, even when surgical resection is contraindicated or technically impossible, it should still be possible to achieve satisfactory palliation of jaundice. Methods: We ana]yzed the 72 patients with carcinoma of proximal bile ducts who were admitted to Pusan National University Hospital from January 1982 to December 1993. Results: The mean age of the patients was 69.1 years old and the ratio of male to female was 1.88:1. The clinical manifestations showed jaundice(97%), right upper quadrant pain(31%), pruritus(22%), epigastric pain(19%) and weight loss(117c). Prevalence rate of proximal cholangiocarcinoma according to the level of lesion in proximal bile duct was 71% in Klatskin tumor(Bismuths type I 16%, type II 0%, type III 6%, type IV 49%), 11% in common hepatic duct, 9% in common bile duct(the area in which cystic duct is communicated with common hepatic duct in this article), and 9% in intrahepatic duct (left 3%, right 6%). The Clonorchis sinensis infestation was associated in 50%, which was the most common associated disease with proximal cholangiocarcinoma. The cholangitis was associated in 5k, the sepsis in 15%, the hepatitis B in 117o, and the liver cirrhosis in 10%. The choledocholithiasis was associated in 5%, which consists of the gallstones in 3%, the common bile duct stones in 1%, and intrahepatic duct stones in 1%. The direct invasion of surrounding structures and metastasis were found in 23 cases. Among 23 cases, direct invasion was found in 18 cases, especially liver invasion in 14 cases, and distant metastasis in 4 cases, among which peritoneal metastasis was 2 cases. Staging could be reviewed in 70 cases. Among them, stage I was found in 46 cases(69%), stage III in 3 cases(3%), stage IV in 21 cases(28%), and stage II was not found. Percutaneous transhe- patic biliary drainage(PTBD) was performed in 43 cases (60%) and T-tube insertion in 7 cases (10%). Nothing was performed in 22 cases(30%). Conclusions: A clinical awareness of the manifestation of proximal cholangiocarcinoma will result in early diagnosis and treatment. Even when surgical resection can not be performed, palliation of jaundice should be required for prolonged survival of patients. (Korean J Gastroenterol 1995;27:700-710)
주형준(Hyung Jun Joo),박주문(Joo Moon Park),오성업(Sung Up Oh),성세진(Se Jin Sung) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper is to see the availability of electrical signatures as a means for evaluating performance of MOVs which are extensively used in safety-related systems in nuclear plants To estimate motor torque, two methods such as d-q frame conversion and air-gap method are suggested and estimated results are compared with measured values. The error between measured and estimated torques is within acceptable error bound with below 1% under varied load. Frequency domain analysis of calculated torque has been done as well. It is shown that monitoring of peak frequency could give useful clues to detect anomalies of MOV
수중 초음파 통신을 위한 적응형 BPSK 복조기의 DSP 구현
전재국(Jae-Kuk Jeon),박찬섭(Chan-Sub Park),주형준(Hyung-Jun Joo),김기만(Ki-Man Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The performance of a digital baseband signal processing and data transmission rate depends on the modulation technique. In this paper, We implemented DSP communication system for Underwater acoustic communication using by adaptive BPSK modem technique. In order to implement adaptive modem, we suggested SNR detection block. SNR detection block has the reference SNR value that selects between window filter path and matched filter path. In this paper, suggested system is based on software interface and all Hardware(PLL, modem filter, equalizer etc) is implemented by software, exclusive of DSP, A/D, D/A converter, SDRAM and Flash memory.