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RISS 인기검색어
- 검색키워드
- 저자 : 최승민 ( Seung Min Choi ) (검색결과 59 건)
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최승민,최대균,최부병,Choi, Seung-Min,Choi, Dae-Gyun,Choi, Boo-Byung 대한턱관절교합학회 2003 구강회복응용과학지 Vol.18 No.2
It is very important to arrange the artificial teeth correctly in bucco-lingual (labio- lingual) relation in reconstrcting dentition. Although many anatomic landmarks and techniques have been reported over the years, they are based on westerns. So this study was performd to examine the horizontal relations of mandibular teeth in Korean dentulous adults. 200 volunteers(mean age 22.9) who had natural dentition were selected. The impressions were taken with irreversible hydrocolloid impression material and mandibular study models were fabricated using class I dental stone. Then they were measured with 3-dimensional measuring device specially designed for this study. The results were as follows ; It is better to consider the lingual cusps of the lower posterior teeth as a guide than the linguoaxial surfaces of the lower posterior teeth, arranging the lower posterior teeth buccally to the line which starts from the mesial aspect of the lower canine and continue backward to the lingual aspect of the retromolar pad. It is better to arrange the fossae of the lower posterior teeth buccally to the line which starts from the cusp tip of the lower canine and continue backward to the top of the retromolar pad. The positions of the lower posterior teeth in the denture-bearing area ; considering the fossa as a guide, the 2nd premolar was positioned in center. considering the buccal cusp as a guide, the 1st molar and the 2nd molar were positioned in center. the distance ratio(d/a) was incresed constantly from the lower canine to the 2nd molar d ; the distance between the buccal vestibule(the lowest point) and the buccal cusp tips of the lower posterior teeth. a ; the distance between the buccal vestibule(the lowest point) and the lingual vestibule(the lowest point). The lower canine was positioned lingually($0.11{\pm}0.13$) than the labial vestibule, and the central incisor and the lateral incisor were positioned almost in the imaginary perpendicular plane of the labial vestibule(the lowest point).
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최승민,이재관,고성희,엄흥식,장범석,Choi, Seung-Min,Lee, Jae-Kwan,Ko, Sung-Hee,Um, Heung-Sik,Chang, Beom-Seok 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.4
The nature of the implant surface can directly influence cellular response, ultimately affecting the rate and quality of new bone tissue formation. The aim of this in vitro study was to investigate if human osteoblast-like cells, Saos-2, would respond differently when plated on disks of magnesium titanate and machined titanium. Magnesium titanate disks were prepared using Micro Arc Oxidation(MAO) methods. Control samples were machined commercially pure titanium disks. The cell adhesion, proliferation and differentiation were evaluated by measuring cell number, and alkaline phosphatase(ALPase) activity at 1 day and 6 day after plating on the titanium disks. Measurement of cell number and ALPase activity in Saos-2 cells at 1 day did not demonstrate any difference between machined titanium and magnesium titanate. When compared to machined titanium disks, the number of cells was reduced on the magnesium titanate disks at 6 day, while ALPase activity was more pronounced on the magnesium titanate. Enhanced differentiation of cells grown on magnesium titanate samples was indicated by decreased cell proliferation and increased ALPase activity.
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초음파 의료 영상에서 비집속 송신을 이용한 고속 음향 복사력 임펄스 영상법
최승민,박정만,권성재,정목근,Choi, Seung-Min,Park, Jeong-Man,Kwon, Sung-Jae,Jeong, Mok-Kun 한국음향학회 2012 韓國音響學會誌 Vol.31 No.3
초음파 의료 영상에서 탄성영상은 암과 같은 종양의 진단에 도움을 준다. 본 논문은 초음파 음향 복사력을 이용하여 관찰하고자 하는 연조직에 힘을 인가하여 탄성 영상을 구현하였다. 데이터 획득 시간을 줄이기 위하여 송신 집속을 하지 않고 버스트 (burst) 형태의 평면파를 송신하여 모든 영상 영역에 동시에 음향 복사력이 인가되도록 하였다. 균일 탄성팬텀을 이용한 실험에서 송신 집속을 하지 않고도, 송신 시간을 길게 함으로써 탄성 영상을 얻기에 충분한 음향 복사력을 얻을 수 있음을 확인하였다. 그러나 기존의 집속형 음향 복사력을 이용한 영상과는 다른 시간 대 변위 특성이 관찰되었다. 제안한 탄성 영상 기법으로 초음파 병변 탄성 팬텀과 소의 간 실험에서 병변을 구별할 수 있음을 확인하였다. In medical ultrasound imaging, elasticity imaging helps to diagnose tumors such as cancer. This paper is concerned with the application of acoustic radiation force to soft tissue of interest to implement elasticity imaging. In order to reduce the data acquisition time, instead of relying on transmit focusing, a plane wave of burst type is transmitted to apply the acoustic radiation force simultaneously to an entire imaging region to be observed. A homogeneous phantom experiment confirms that increasing the transmit excitation duration instead of employing transmit focusing generates a high enough acoustic radiation force to obtain elasticity images. It is found, however, that a different displacement versus time characteristic is observed unlike the case of using a conventional focused acoustic radiation force. Experimental results obtained through the use of an ultrasound phantom and a bovine liver show that lesions can be correctly differentiated.
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초소형 전기차용 3단 변속기 가속수명평가 방법에 관한 연구
최승민(Seung Min Choi),김진복(Jin Bok Kim),김형준(Hyung Joon Kim),이정일(Jeong Il Lee),김경률(Kyung Ryool Kim),정훈(Hoon Jeong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, the accelerated life test method was designed by extracting parameters from a transmission for a micro-electric vehicle with a motor of less than 15 Kw and calculating a shortened accelerated life test time based on the linear cumulative damage theory. Major parameters were selected to develop an accelerated life test method, and accelerated test time calculation and test pattern were presented. As a result of calculation using the shape parameter values, a test with a failure-free test time of 1,506 hours is required to guarantee a service life of 60,000 km (equivalent to 3 years) on a passing basis of 90% confidence level. Based on the maximum design torque that can be output at each stage, taking into account the cumulative damage effect. If the accelerated test is performed at 132%, the accelerated index is calculated as 23.4, reducing the time for the fault-free accelerated life test to 64.3 hours. The pattern was set so that the fatigue durability test of 64.3 hours for each stage of reversing and advancing the no-failure accelerated life test time was performed. However, since the forward first stage and the backward stage are composed of the same power transmission logic, the test time was divided. The test was designed to perform a total of 193 hours.
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픽업 유틸리티 전기차용 듀얼 모터 EVT의 가속수명평가에 관한 연구
최승민(Seung Min Choi),이정일(Jeong Il Lee),김형준(Hyung Joon Kim),이수정(Su Jeong Lee),김경률(Kyung Ryool Kim),정훈(Hoon Jeong) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In this study, an accelerated life test method based on the linear cumulative damage theory was designed to ensure the reliability of the dual motor EVT for a 500kg utility electric vehicle. In order to develop an accelerated life test method, major parameters were selected, and accelerated life calculation and test patterns were presented. As a result of calculation using the shape parameter values, a test with a fault-free time of 3,765 hours is required to ensure the service life of 150,000 km(equivalent to 7 years) based on 90% confidence level acceptance criteria. Considering the cumulative damage effect, the maximum design torque that can be output at each stage was used as a reference. When performed at 132 percent of the maximum design torque, the acceleration index is calculated as 23.4 and the acceleration life test time is shortened to 161 hours. For the accelerated life test, the pattern was set to perform a constant-speed durability test of 80.5 hours each reverse and forward. As a result of the test, no physical abnormality was found, and the efficiency was 96% before and after the test. Accordingly, it is judged that the reliability of the durability capability of EVT has been secured.
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관련 연구 자동 생성을 위한 LLM의 활용 및 정제 기법 제안
최승민(Seung-min Choi),정유철(Yu-chul Jung) 한국정보전자통신기술학회 2024 한국정보전자통신기술학회논문지 Vol.17 No.4
과거부터 꾸준히 지식 그래프(Knowledge Graph)와 언어 모델(LM, Language Model)의 통합에 대한 많은 연구가 다뤄지고 있다. 그 중, 지식 그래프의 구조화된 지식을 이용해 자동 텍스트 생성을 다루는 연구는 그리 활성화되지 않았다. 본 연구에서는 기존 논문들과 비슷한 수준의 특정 도메인 관련 연구 항목(Related Work)을 자동 생성하기 위한 방법론, 즉, ‘1) 최적의 Prompt 선정, 2) 4단계 정제기법을 통해 Triple 추출, 3) 지식 그래프 구축, 4) 관련 연구 자동 생성’을 제안한다. 제안된 방법론은 대규모 언어 모델(LLM) 중, GPT-4를 활용하고, 4단계 정제 기법을 적용하여 관련 연구를 자동으로 생성하도록 설계했다. 그렇게 설계된 모델은 Triple 추출에서 #Supp, #Cont, Fluency에서 17.3, 14.1, 4.2의 성능과 GPT-4 자동 평가 기준, 100점 기준 정제 전, 88.5점에서 정제 후, 96.5점으로 기존 논문과 비슷한 수준의 유의미한 관련 연구 자동 생성 능력을 보였다. Research on the integration of Knowledge Graphs (KGs) and Language Models (LMs) has been consistently explored over the years. However, studies focusing on the automatic generation of text using the structured knowledge from KGs have not been as widely developed. In this study, we propose a methodology for automatically generating specific domain-related research items (Related Work) at a level comparable to existing papers. This methodology involves: 1) selecting optimal prompts, 2) extracting triples through a four-step refinement process, 3) constructing a knowledge graph, and 4) automatically generating related research. The proposed approach utilizes GPT-4, one of the large language models (LLMs), and is desigend to automatically generate related research by applying the four-step refinement process. The model demonstrated performance metrics of 17.3, 14.1, and 4.2 in Triple extraction across #Supp, #Cont, and Fluency, respectively. According to the GPT-4 automatic evaluation criteria, the models performamce improved from 88.5 points vefore refinement to 96.5 points agter refinement out of 100, indicating a significant capability to automatically generate related research at a level similar to that of existing papers.
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LED 가로등 누전사고 예방을 위한 전압형 절연저항 감지기 개발 및 IoT 시스템 구축
최승민(Seung-Min Choi),곽동걸(Dong-Kurl Kwak),류진규(Jin-Kyu Ryu),정민상(Min-Sang Jung) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
About 40% of outdoor earth leakage are caused by moisture penetration. Outdoor streetlights frequently have earth leakage. However, existing earth leakage breakers lack reliability. There is also a problem that it is difficult for managers to recognize earth leakage immediately. Therefore, this paper proposes a highly reliable earth leakage detector using a Wheatstone Bridge circuit. It also develops an IoT system that can be immediately recognized by managers in the event of a earth leakage.
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