텐서플로우 튜토리얼 방식의 머신러닝 신규 모델 개발 : 캐글 타이타닉 데이터 셋을 중심으로

김동길,박용순,박래정,정태윤,Kim, Dong Gil,Park, Yong-Soon,Park, Lae-Jeong,Chung, Tae-Yun 대한임베디드공학회 2019 대한임베디드공학회논문지 Vol.14 No.4

The purpose of this study is to develop a model that can systematically study the whole learning process of machine learning. Since the existing model describes the learning process with minimum coding, it can learn the progress of machine learning sequentially through the new model, and can visualize each process using the tensor flow. The new model used all of the existing model algorithms and confirmed the importance of the variables that affect the target variable, survival. The used to classification training data into training and verification, and to evaluate the performance of the model with test data. As a result of the final analysis, the ensemble techniques is the all tutorial model showed high performance, and the maximum performance of the model was improved by maximum 5.2% when compared with the existing model using. In future research, it is necessary to construct an environment in which machine learning can be learned regardless of the data preprocessing method and OS that can learn a model that is better than the existing performance.

장애인의 보조기 사용에 대한 현황과 만족도에 관한 연구

김동길,Kim, Dong-Gil 대한물리치료과학회 2002 대한물리치료과학회지 Vol.9 No.3

This study intended to find out how the handicapped use medical aid, their satisfaction at using it and so on. First a preliminary survey(Apr. 20$\sim$24, 2002) was made for the handicapped who had been cured for rehabilitation by wearing medical aid at hospitals and welfare center in Jeonbuk region. Then total 120 subjects were asked to fill out a standardized questionnaire from May 15$\sim$22, 2002. Out of total 95 questionnaires collected, 84 questionnaires were analyzed except for 11 cases unsuitable for the intention of this study. The results can be outlined as follows: 1. In general characteristic, it was found that the causes of disability included disease(35 respondents; 41.7%), traffic accident(23 respondents, 27.4%) and so on. In addition, 1st handicap comprised the majority(32 respondents; 58.2%) in handicap grade and ankle foot orthosis(or b-k orthosis) was most often used as medical aid(28 respondents: 33.3%) 2. In particular, it was also shown that the 1st handicap mainly resulted from traffic accident(15 respondents, 27.3%) and post-disease disability (11 respondents, 20.0%). They wore medical aid for 1 year or less on the average, because they were hospitalized for cure, which showed statistically significant level(P<0.05). 3. It was found that total 69 respondents(82.1%) were more or less satisfied with their medical aids depending on the causes of disability, and total 46 respondents(83.6%) were satisfied with their aids according to their handicap grade, but there were no statistical significance. 4. Total 56(66.7%) respondents answered that they would purchase medical aid on their own expenses, when they became handicapped. And the price of medical aid ranged from $\300,000{\sim}400,000$(25 respondents: 29.8%) to \ 500,000 or more(24 respondents: 28.6%). It means that they purchased more or less expensive medical aid on their own expenses, which showed statistical significance(P<0.05). 5. If there was any failure of medical aid, 9 respondents(37.5%) answered that they would be serviced from medical companies, and 7 respondents(29.2%) would be serviced from medical aid manufacturers. Most respondents were serviced for their medical aids from related companies. For the question about the causes of dissatisfaction upon repair service, 11 respondents(45.8%) answered that existing service company provided unskilled repair services and other respondents answered that there was no spare part or higher service expenses than they thought. These answers had the statistical significance(P<0.05). However, 20 respondents(79.2%) answered that they were satisfied with the repair service, which means that most respondents are satisfied with the service. In view of the results as described above, it can be concluded that their handicap or disability results from disease or sequelae after traffic accident and most of the affected wear their own medical aid. In the future, it is required that the medical insurance should cover those medical aids, and the service for failed medical aids should be commissioned by technical serviceman to realize customized manufacture and repair service according to different causes so that the handicapped can enjoy more or less comfort and convenience in their daily lives without any extreme difficulty.

2004년 나는 이렇게 생각한다-프리프레스기기 분야

김동길,Kim, Dong-Gil 대한인쇄문화협회 2004 프린팅코리아 Vol.19 No.-

유사석유제품 유통실태

김동길,Kim, Dong-Gil 대한석유협회 2007 석유와 에너지 Vol.260 No.-

머신러닝 자동화를 위한 개발 환경에 관한 연구

김동길,박용순,박래정,정태윤,Kim, Dong Gil,Park, Yong-Soon,Park, Lae-Jeong,Chung, Tae-Yun 대한임베디드공학회 2020 대한임베디드공학회논문지 Vol.15 No.6

Machine learning model data is highly affected by performance. preprocessing is needed to enable analysis of various types of data, such as letters, numbers, and special characters. This paper proposes a development environment that aims to process categorical and continuous data according to the type of missing values in stage 1, implementing the function of selecting the best performing algorithm in stage 2 and automating the process of checking model performance in stage 3. Using this model, machine learning models can be created without prior knowledge of data preprocessing.

도커 기반의 실시간 데이터 연계 및 처리 환경을 고려한 빅데이터 관리 플랫폼 개발

김동길,박용순,정태윤,Kim, Dong Gil,Park, Yong-Soon,Chung, Tae-Yun 대한임베디드공학회 2021 대한임베디드공학회논문지 Vol.16 No.4

Real-time access is required to handle continuous and unstructured data and should be flexible in management under dynamic state. Platform can be built to allow data collection, storage, and processing from local-server or multi-server. Although the former centralize method is easy to control, it creates an overload problem because it proceeds all the processing in one unit, and the latter distributed method performs parallel processing, so it is fast to respond and can easily scale system capacity, but the design is complex. This paper provides data collection and processing on one platform to derive significant insights from various data held by an enterprise or agency in the latter manner, which is intuitively available on dashboards and utilizes Spark to improve distributed processing performance. All service utilize dockers to distribute and management. The data used in this study was 100% collected from Kafka, showing that when the file size is 4.4 gigabytes, the data processing speed in spark cluster mode is 2 minute 15 seconds, about 3 minutes 19 seconds faster than the local mode.

우리회사소개-(주)다나보일러

김동길,Kim, Dong-Gil (사)한국원적외선협회 2002 한국원적외선협회보 Vol.11 No.-

1949년 1월 국공(國共)평화회담중재에 대한 소련의 태도 및 세계안보전략

金東吉(Kim Dong-Gil) 역사학회 2009 역사학보 Vol.0 No.202

This is an analysis of Stalin's attitude toward the request for peace talks made by the GMD in January 1949. In discussing the positions of the Soviet Union toward the Chinese Civil War as well as Soviet global security strategy as a whole, this study utilizes telegrams exchanged between Stalin and Mao Zedong in January 1949 discussing the peace talks, newly discovered documents sent to Moscow by the Soviet embassy in China, and interview materials. This author comes to the conclusion that Stalin attempted to mediate between the Nationalist GMD and CCP. Stalin's attempt at mediation was met with strong opposition by Mao Zedong and thus failed to transpire. However, the event gave the CCP leadership the clear impression that Stalin was dissuading the CCP to cross the Yangtze River, thereby resulting in a divided China. Stalin's desire to see China split in half according to a so-called "northern and southern dynasty" scenario could provide numerous benefits to the Soviet Union. First, such a scenario would avoid American military intervention and thus avoid risking a complete collapse of the CCP. Second, division could pin down American material and military resources in China. And finally, the Soviet Union would be able to retain the various privileges in China that it had received from the Yalta Agreement. A divided China, from the perspective of the Soviet Union, would leave the Soviets in a position of much to gain with nothing to lose.

소련과 제2차 항일국공합작

金東吉(Kim Dong-Gil) 동양사학회 2008 東洋史學硏究 Vol.105 No.-

Emergence of fascist Japan and German in the 1930s gravely threatened security of Soviet Union from east and west. Therefore, Soviet Union stopped the policy of world revolution with leading role of labor class and planned to establish world United Front with bourgeois class of each country and to confront with fascist Japan and German. The 7th Communist International Congress held in July 1935 at Moscow became the watershed of turnover of Soviet Union policy. Soviet Union continually gave pressure on China Communist Party (CCP) to establish anti-Japanese united front with Kuomintang (KMT) leading role. Deadly crushed Red army after Long March in 1935 and military assistance of German towards KMT government became other reasons to press CCP for establishing United Front with KMT leading role. On the other hand, Soviet Union gave pressure on Kuomintang to form anti-Japanese united front with CCP. Soviet Union promised military assistance to Kuomintang on condition that Kuomintang stop anti-Red army operation and start anti-Japanese military operation with CCP together. Continued endeavor of Soviet Union formed solid foundation for quick establishing KMT-CCP United Front after Sino-Japanese War broke out, and the United Front between KMT and CCP lasted for 8 years of Anti-Japanese War.

1945년-1950년 중ㆍ미관계와 “중국 상실론” 비판

김동길(Kim Dong-gil) 동양사학회 2010 東洋史學硏究 Vol.111 No.-

After World War II, the U.S. government established an Asian foreign policy with the Jiang Jieshi Guomindang government taking a leading role. From the surrender of Japan to the breakout of the Korean War, U.S. foreign policy toward China can be broadly divided into five stages. First, was the policy of supporting Jiang Jieshi while embracing communism between the period of August 1945 and the breakout of the Chinese civil war in 1946. The second stage was based on a policy of supporting Jiang Jieshi while opposing the Chinese communists. This was executed from the breakout of the Chinese civil war to the second half of 1947. The third stage focused on preventing Communist China from becoming a puppet regime of the Soviet Union. The fourth stage consisted of attempts to prevent the signing of the Sino-Soviet alliance. This occurred between the founding of the PRC to the signing of Sino-Soviet alliance in February 1950. Finally, after the signing of Sino-Soviet alliance, U.S. policy gradually shifted from a strategy of abandoning Taiwan to an engagement and protection of the island. In order to achieve its policy goals, the U.S government selectively used both tough and soft stances toward Communist China. On the early of January 1950, the U.S had openly announced its abandonment of Taiwan but failed to prevent the Sino-Soviet alliance from taking place. In the early months of 1949, Communist China, on her own initiative, enacted a policy of refusing to normalize diplomatic relations with the U.S in the foreseeable future and abrogating all Western privileges in China. Moreover, Communist China, on 30 June 1949, declared it would “lean-to-one-side”, meaning that U.S policy toward China had totally failed. From the 1970s on, scholars proposed the theory of a “Lost Chance” and a “Lost China”. However, these arguments were based on assumptions that the Chinese Communists earnestly sought U.S recognition to expedite their country’s postwar economic reconstruction, and that Washington’s failure to offer sufficient support to the Guomindang during the Chinese civil war was the critical factor for the Communist victory. They believed that Washington’s anti-Communist policy forced the CCP to treat the United States as an enemy. But, in the middle of 1949, the U.S state department published the “China White Paper”, stating that the CCP's land reform policies, as well as the incapability and corruption of the Guomindang, were the main factors which contributed to the CCP's victory. This explanation, along with a careful analysis of Communists China’s foreign policy in the early months of 1949, clearly demonstrate that the so called “Lost Chance” “Lost China” theory is based on incorrect assumptions.