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Intensity-modulated radiation therapy: a review with a physics perspective
Cho, Byungchul The Korean Society for Radiation Oncology 2018 Radiation Oncology Journal Vol.36 No.1
Intensity-modulated radiation therapy (IMRT) has been considered the most successful development in radiation oncology since the introduction of computed tomography into treatment planning that enabled three-dimensional conformal radiotherapy in 1980s. More than three decades have passed since the concept of inverse planning was first introduced in 1982, and IMRT has become the most important and common modality in radiation therapy. This review will present developments in inverse IMRT treatment planning and IMRT delivery using multileaf collimators, along with the associated key concepts. Other relevant issues and future perspectives are also presented.
Intensity-modulated radiation therapy: a review with a physics perspective
Byungchul Cho 대한방사선종양학회 2018 Radiation Oncology Journal Vol.36 No.1
Intensity-modulated radiation therapy (IMRT) has been considered the most successful development in radiation oncology since the introduction of computed tomography into treatment planning that enabled three-dimensional conformal radiotherapy in 1980s. More than three decades have passed since the concept of inverse planning was first introduced in 1982, and IMRT has become the most important and common modality in radiation therapy. This review will present developments in inverse IMRT treatment planning and IMRT delivery using multileaf collimators, along with the associated key concepts. Other relevant issues and future perspectives are also presented.
Byungchul Cho 건국대학교 아시아·디아스포라 연구소 2021 International Journal of Diaspora&Cultural Critici Vol.11 No.1
As the number of telecommuting in the post-corona era increases, the role of wearable mobile devices and smart homes becomes important, and demand for smart mobility services such as self-driving cars beyond time and space constraints is soaring. Smart mobility services in the post-Corona era are signaling a civilization-historical turnaround beyond simple means of transportation. However, most of the research centers of big data and artificial intelligence-based engineers in carrying out research and development of related technologies have been negligent in human-centered research and development have been neglected. In this context, this paper looked at the risk factors caused by personalization services using artificial intelligence and related technologies for economic effects from a humanities perspective. Just as the 14th century plague led the Renaissance, coronavirus is both a crisis of uncertainty and a new opportunity. To overcome this crisis, engineers and humanists related to smart mobility in the post-Corona era will have to present academic map and human-centered services through mutual respect and collaboration.
Lee Minsik,Cho Min-Seok,Lee Hoyeon,Jeong Chiyoung,Kwak Jungwon,Jung Jinhong,Kim Su Ssan,Yoon Sang Min,Song Si Yeol,Lee Sang-wook,Kim Jong Hoon,Choi Eun Kyung,Cho Seungryong,Cho Byungchul 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.1
The purpose of this study is to evaluate the performance of a recurrent neural network (RNN)-based prediction algorithm to compensate for respiratory movement using an articulated robotic couch system. A prototype of a real-time respiratory motion compensation couch was built using an optical 3D motion tracking system and a six-degree-of-freedom-articulated robotic system. To compensate for the system latency from motion detection to re-positioning of the system, RNN and double exponential smoothing (ES2) prediction algorithms were applied. Three aspects of performance were evaluated, simulation and experiments for geometric and dosimetric evaluations, using data from three liver and three lung patients who underwent stereotactic body radiotherapy. Overall, the RNN algorithm showed better geometric and dosimetric results than the other approaches. In simulation tests, RNN showed 82% average improvement ratio, compared with non-predicted results. In the geometric evaluation, RNN only showed average FWHM broadening of 1.5 mm, compared with the static case. In the dosimetric evaluation, RNN showed average gamma passing rates of 97.4 ± 1.0%, 89.0 ± 2.4% under the 3%/3 mm, 2%/2 mm respectively. It may be technically feasible to use the RNN prediction algorithm to compensate for respiratory motion with an articulated robotic couch system. The RNN algorithm could be widely used for motion compensation in patients undergoing radiotherapy.
Beam Optics Design of a 100-MeV Beam Line for PEFP Users
Byungchul Chung,Yong Young Lee,Yong-sub Cho 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The beam delivery systems of the Proton Engineering Frontier Project (PEFP) linear accelerator provide users with 20-MeV and 100-MeV proton beams. Each beam delivery system is divided into five different beam transport lines to satisfy a user's specific requirements. For the 100-MeV beam transport lines, this work examines the beam line optics for extending the vertical beam in the target room. Beam optics, as well as proper components for each part of the 100-MeV vertical beam transport line, are studied by using the well-known TRACE-3D code and Parmila code. The space charge effects do not crucially affect the beam evolution along the PEFP 100-MeV beam line. A consistency check between TRACE-3D and Parmila was accomplished for the investigation of the beam line optics.
GNU C 컴파일러를 기반으로 한 CHILL 컴파일러, GHC의 구현
김병철(Byungchul Kim),권경인(Kyoung-In Kwon),조시철(Si-Cheol Cho) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1A
교환기 소프트웨어 개발에 많은 언어가 사용되고 있으나, 현재 우리나라의 교환기 제조업체 대부분은 ITU-T에서 통신 소프트웨어 개발 언어로 권고하는 CHILL 언어를 사요하고 있다. 그런데, ACK를 기반으로 개발된 기존의 CHILL 컴파일러는 상용 교환기 제품의 개발에 성공적으로 사용되고 있지만, 지원하는 마이크로 프로세서에 대한 제약, 낮은 수준의 최적화 기능, 과도한 메모리 접근 명령 사용 등의 한계로 인하여 교환기 소프트웨어의 성능 향상을 저해하고 있다. LG정보통신에서는 이러한 문제점들을 해결하기 위하여, GNU C 컴파일러를 기반으로 CHILL 컴파일러를 개발하였다. 이 CHILL 컴파일러는 현재 사용 중인 대부분의 마이크로 프로세서를 지원하며, 높은 수준의 최적화 기능을 가지고 있다. 특히, 중간 언어로서 레지스터를 기반으로 한 RTL을 사용함으로써 RISC 칩에 더욱 효과적인 코드를 생성할 수 있다. 점차 대용량화, 고성능화가 요구되면서 주요 장치의 CPU를 RISC 칩으로 교체하고 있는 교환기 개발 프로젝트의 추세를 감안할 때, 이 CHILL 컴파일러는 교환기 기능 개선 및 성능 향상에 매우 높은 기여를 할 것이다.