다기통 엔진 흡기시스템의 유동해석 모델개발

송재원,성낙원,Song, Jae-Won,Seong, Nak-Won 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.6

To design an optimum engine intake system, a flow model for the intake manifold was developed by the finite difference method. The flow in the intake manifold was one-dimensional, and the finite difference equations were derived from governing equations of flow, continuity, momentum and energy. The thermodynamic properties of the cylinder were found by the first law of thermodynamics, and the boundary conditions were formulated using steady flow model. By comparing the calculated results with experimental data, the appropriate boundary conditions and convergence limits for the flow model were established. From this model, the optimum manifold lengths at different engine operating conditions were investigated. The optimum manifold length became shorter when the engine speeds were increased. The effect of intake valve timings on inlet air mass was also studied by this model. Advancing intake valve opening decreased inlet air mass slightly, and the optimum intake valve closing was found. The difference in inlet air mass between cylinders was very small in this engine.

대역 내 기준 파장을 갖는 근적외선 그리즘 실리콘 광 면 센서 분광기 설계 및 제작

송재원 ( Jae-won Song ) 한국센서학회 2017 센서학회지 Vol.26 No.1

An NIR grism Si optical area sensor spectrometer with in-band reference wavelength is designed and fabricated. It is composed of a transmission type diffraction grating (spatial density 300 line/mm), a rectangular N-BK7 prism (apex angle 30 degree), NIR filter( cutoff wavelength 720 nm), an imaging convex lens(focal length 50mm F1.8) and an IR modified DSLR camera (Canon EOS40D) of Si optical area sensor (3,888 × 2,592 pixels, pixel size 5.710 μm). “In-band reference wavelength function” is implemented using non-dispersive 0th diffraction order optical beam. The NIR grism spectrometer is tested in a laboratory using a halogen lamp and a Neon lamp. And the spectrometer is used in an astronomy field for obtaining the planet Jupiter NIR spectrum. In-band reference wavelength i.e. un-deviation wavelength is 846 nm, an wavelength resolution is 0.3027 nm/pixel, an wavelength resolving power is 2,794 and an wavelength range is 650~1,000 nm.

올바른 수하물 자세교정을 위한 효과적인 인접수하물 분리방법

송재원(Jae-Won, Song),정용하(Yong-Ha, Jung),김동철(Dong-Chul, Kim) 한국정보과학회 2016 한국정보과학회 학술발표논문집 Vol.2016 No.12

수하물 이중 적재 방지를 위한 수하물 자세교정 시스템의 효과적인 이중 수하물 분리방법

송재원(Jae-Won Song),김동철(Dong-Chul Kim) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.3

In this paper, we propose a method to effectively split the adjacent baggage that is moving on high speed conveyor of airport. The proposed method calculate the Angle Histogram(AH) that inspects background pixels within radius r based on the center point of the adjacent baggage. After that, the adjacent baggage is segmented by finding split angles at the AH. We also improved the split quality of adjoining baggage by repeatedly correcting the center point to correctly split adjacent baggage of asymmetric size. And the calculation time of AH is reduced about 1/3 by using the symmetry property of the circle. Experiments have shown that 93% of all adjacent baggage images are correctly segmented and the proposed method is effective.

자폐 스펙트럼 장애 청소년에서 주의력결핍 과잉행동장애 유무에 따른 임상적 특성

송재원(Jae-Won Song),반건호(Geon-Ho Bahn),조인희(In-Hee Cho),조수철(Soo-Churl Cho),김붕년(Bung-Nyun Kim),신민섭(Min-Sup Shin),김재원(Jae-Won Kim),박수빈(Subin Park),홍순범(Soon-Beom Hong),유희정(Hee-Jeong Yoo) 대한소아청소년정신의학회 2013 소아청소년정신의학 Vol.24 No.4

Objectives:It is known that adolescents with autism spectrum disorder (ASD) often concurrently exhibit attention-deficit hyperactivity disorder (ADHD). The objective of this study is to investigate how ADHD symptoms modify clinical characteristics in adolescents with ASD. Methods:Subjects were recruited from the Program for the Education Enrichment of Relational Skills program, which is a program for adolescents with ASD to promote and train social skills. The study participants and their parents completed the study questionnaires, such as the ADHD rating scale, Autism Diagnostic Observation Schedule, and Korean version of Child Behavior Checklist. Results:Adolescents with ASD and ADHD (N=19) were found to have more impaired sociality, less open communication with their parents, and more behavioral and emotional problems compared with adolescents with ASD, and without ADHD (N=28). Conclusion:Although further research is needed, the results of our study suggest that adolescents with ASD present different clinical characteristics when comorbid with ADHD.

품질관리검토시간과 감사인 교체사이의 관련성

송재원(Song, Jae-Won),김용식(Kim, Yong Shik) 한국회계정보학회 2018 한국회계정보학회 학술대회발표집 Vol.2018 No.2

본 연구는 2014년부터 2016년까지 국내 상장회사의 연도별 자료 4,580개를 표본으로 품질관 리검토시간비율과 감사인 교체사이의 관련성 그리고 감사보수와 경영자 교체의 조절효과를 실증 분석하였다. 실증 분석결과, 감사인 교체직전 품질관리검토시간비율이 높다는 사실을 확인하였으며 품질관리검토시간비율이 높을수록 감사인 교체성향이 높은 것으로 나타났다. 감사인의 독립성에 영향을 미칠 것으로 예상되는 감사보수를 상호 작용변수로 추가하여 품질관리검토시간비율과 감사인교체사이의 관련성에 어떠한 영향을 미치는지를 실증 분석한 결과, 감사보수는 품질관리검토시간비율과 감사인교체사이의 관련성에 음(-)의 영향을 미치는 것으로 나타났다. 감사보수가 크면 클수록 품질관리검토시간비율과 감사인 교체사이의 관련성을 약화시켰으며 이는 감사보수가 크면 클수록 감사인의 독립성이 약화되기 때문으로 해석된다. 감사인 교체현상과도 유의한 관계가 있는 것으로 선행 연구된 경영자 교체를 상호작용변수로 추가하여 품질관리검토시간비율과 감사인 교체사이의 관련성에 어떠한 영향을 미치는지 실증 분석한 결과, 경영자 교체는 품질관리검토시간비율과 감사인 교체사이의 관련성에 양(+)의 영향을 미치는 것으로 나타났다. 신임경영자는 협조적인 감사인을 선호함으로써 경영자 교체가 발생한 경우 품질관리검토시간비율과 감사인 교체사이의 관련성이 강화되는 것으로 해석된다. 본 연구 결과가 제시하는 공헌점 및 시사점은 다음과 같다. 2014년도 외감법 개정으로 공시되는 ‘외부 감사실시내용’ 자료를 이용한 실증연구의 외연을 넓히는데 기여 하였으며 과다한 감사보수를 지급하는 회사와 신임 경영자가 감사인을 교체하는 회사의 경우 정부감독당국에서 회계감독을 더 강화하여야 한다는 시사점을 제공하고 있다. This study analyses 4,580 annual data from domestic listed companies from 2014 to 2016 and demonstrates the relation between the ratio of quality control review hours and the auditor change and investigates the moderation effect of audit fee and CEO turnover. The empirical analysis confirms that the ratio of quality control review hours before the auditor change is high and the higher the ratio of quality control review hours, the more likely it is to change auditors. Meanwhile, an empirical analysis on the relation between the ratio of quality control review hours and the auditor change by adding the moderating variable of audit fee that is expected to affect the independence of auditors shows that the audit fee is found to have negative effects on the relation between the ratio of quality control review hours and the auditor change. This result implies that the larger the audit fee is, the weaker is the independence of auditors. An empirical analysis on the relation between the ratio of quality control review hours and the auditor change by adding the moderating variable of CEO turnover that has been studied in advance to have a significant relationship with the auditor change shows that it has been found that the CEO turnover has a positive effect on the relation between the ratio of quality control review hours and the auditor change. It is interpreted that in the event of the CEO turnover the relation between the ratio of quality control review hours and the auditor change is strengthened because the new CEO wants to prefers a cooperative auditor. The implications and contributions presented by this study include: This study suggests that government regulators should pay attention to supervising companies with excessive audit fee contracts and companies with auditors change by the new CEO. And this study contributes to widen the scope of research on the quality control review hours.

상피 종양 진단을 위한 병리진단 프레임워크와 췌장선암의 적용 예

송재원(Jae-Won Song),이주홍(Ju-Hong Lee) 한국정보과학회 2013 정보과학회 컴퓨팅의 실제 논문지 Vol.19 No.6

본 논문은 상피조직에서 발생하는 종양진단을 위한 자동화된 병리진단 프레임워크를 제안한다. 제안된 프레임워크는 병리적 지식을 기반으로 주어진 조직영상을 내강, 상피세포, 그리고 비-상피세포 영역으로 분할하고, 각 분할된 객체들의 형태학적 특징들을 추출함으로써 상피조직에서 발생하는 종양에 대한 정량적인 병리진단의 기반을 제공한다. 우리는 제안된 프레임워크의 적용가능성을 보이기 위해 췌장암의 90%를 차지하는 췌장선암의 진단 문제에 적용하였다. 병리진단은 병의 발생 부위 및 병의 종류에 따라 진단 방법이 다르고 검토되는 특징들도 다르다. 따라서 본 논문은 분할된 객체들에 대한 기본적인 형태학적 특징들과 함께 췌장선암을 진단하는데 필요한 특징들을 추출하고 그 특징들을 이용하여 췌장선암 진단을 수행하는 예를 보여준다. 제안된 진단 프레임워크는 상피조직을 포함하는 선암이나 낭성종양 등의진단을 위한 조직세포 영상 기반의 진단 프레임워크를 제공 할 수 있을 것이다. This paper proposes a framework for automated pathology diagnosis of neoplasm that occurs in epithelial tissues. The proposed system segment a tissue image into lumen, epithelial cell, and non-epithelial cell based on pathological knowledge and extracts morphological features from segmented objects. It provides a basis to quantitatively diagnose neoplasm occurring in epithelial tissue. In order to prove the applicability of the proposed framework, we conduct experiments for diagnosing pancreatic ductal adenocarcinoma occurring in epithelial tissue. The pancreatic ductal adenocarcinoma accounts for 90% of pancreatic cancer. There are various diagnostic methods and characteristics to be analyzed according to each lesion and tumor type. In this paper, we extract new morphological features for diagnosing pancreatic ductal adenocarcinoma with classical morphological features from segmented objects and shows practical example to diagnose pancreatic ductal adenocarcinoma that is the neoplasm occurring in epithelial tissue. The proposed framework will provide a foundation for diagnosing the neoplasm occurring in epithelial tissue such as adenocarcinoma, cystic tumor, and so on.

쉽게 익히는 한글 모스 부호(HaMEL)의 고 음소 확장

송재원(Jae-won Song) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.11

운지가 쉬운 한글 세벌식 23키 음소/음절화음키 컴퓨터자판: 안마태자판 개선

송재원(Jae-won Song) 한국통신학회 2021 韓國通信學會論文誌 Vol.46 No.2

공항서비스의 사용자 경험확대를 위한 공간상황 인식기반 개방형 플랫폼 기술 개발의 필요성

송재원(Jae-Won Song),박대순(Dae-Soon Park) 한국정보과학회 2014 한국정보과학회 학술발표논문집 Vol.2014 No.12