지상파/케이블 데이터방송 재전송 서비스를 위한 PMCP 기반 PSIP 변환기

최지훈,김용호,최진수,홍진우,Choi Ji Hoon,Kim Yong Ho,Choi Jin Soo,Hong Jin Woo 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.6

본 논문은 디지털방송 서비스의 필수 기술 요소이고 디지털방송 전환과 밀접하게 관련 있는 PSIP 응용 기술인 디지털방송 표준 인터페이스로 표준화된 PMCP(Program Metadata Control Protocol) 인터페이스 규격과, 이를 이용하여 구현된 지상파/케이블 데이터방송 재전송 서비스를 위한 PSIP 변환기의 구조 및 주요 기능에 대해서 기술한다. 본 논문의 PSIP 변환기는 지상파/케이블 데이터방송 재전송 서비스 환경하에서 디지털 지상파 데이터방송 콘텐츠를 디지털 케이블 데이터방송에 재사용하여 데이터방송 콘텐츠 활용도를 높일 뿐만 아니라 실시간 채널 정보 변경 및 방송 프로그램 이벤트 정보 변경만으로 지상파 방송프로그램 안내 정보를 쉽게 재활용/관리할 수 있다. 또한 저장/관리된 방송프로그램 안내 정보를 ATSC T3/Sl에서 표준화한 PMCP 규격을 이용하여 XML형태로 케이블 시스템(OOB SI, Out Of Band Service Information)으로 전송하거나, MPEG-2 전송스트림 형태로 전송할 수도 있다. In this paper, we implemented a terrestrial/cable PSIP converting system, so-called a PSIP converter, which is converting a terrestrial PSIP into a cable PSIP for a data broadcasting service in the interoperable network of terrestrial and cable, and define an interface between the PSIP converter and the OOB SI generator by using PMCP messages compliant to ATSC T3/Sl. The exiting PSIP converter just converts a terrestrial PSIP into a cable PSIP compliant to ATSC and OCAP standard and transmits by a MPEG-2 TS format. That is to say, it is not for the digital data broadcasting but for the digital broadcasting. In addition, the PSIP converter can support various types of PSIP information to the OOB SI generator by using PMCP messages defined by a hierarchical structure as per each channel, audio/video event, data event and so on.

Response Evaluation after Stereotactic Ablative Radiotherapy for Lung Cancer

최지훈,Choi, Ji Hoon Korean Society of Medical Physics 2015 의학물리 Vol.26 No.4

정위 방사선치료를 받은 폐암환자에서 결과를 후향적으로 분석하고자 하였다. 연속된 흉부 컴퓨터단층촬영(CT)의 종양의 크기변화 분석을 통해 치료 반응 평가를 조사하였다. 11명의 초기 비소세포폐암환자를 대상으로 정위 방사선치료 선량의 중앙값은 6,000 cGy이고 분할 조사 회수의 중앙값은 5회였다. 경과 관찰기간의 중앙값은 28개월로 치료후 종양의 크기 변화는 총 51회의 CT를 통해 분석하였고, 각 환자당 중앙값 3회의 CT 촬영이 시행되었다. 본 연구에서 치료의 총 반응률은 90.9%로 5명의 환자에서 완전관해와 5명에서 부분관해가 관찰되었다. 부분관해와 완전관해까지의 기간의 중앙 값은 각각 3개월과 5개월이었다. 경과관찰에서 3명의 환자가 병의 진행양상을 나타내었다. 본 연구에서 초기 폐암의 정위방사선치료후 CT 분석을 통해 반응 평가와 함께 치료 반응 시점을 확인할 수 있었다. We retrospectively reviewed lung cancer patients who were treated with stereotactic ablative radiotherapy (SABR). We investigated the value of response evaluation after treatment by measuring the volume change of tumors on serial chest computed tomography (CT) examinations. The study included 11 consecutive patients with early-stage (T1-T2aN0M0) non-small cell lung cancer (NSCLC) who were treated with SABR. The median dose of SABR was 6,000 cGy (range 5,000~6,400) in five fractions. Sequential follow-up was performed with chest CT scans. Median follow-up time was 28 months. Radiologic measurement was performed on 51 CT scans with a median of 3 CT scans per patient. The median time to partial response ($T_{PR}$) was 3 months and median time to complete remission ($T_{CR}$) was 5 months. Overall response rate was 90.9% (10/11). Five patients had complete remission, five had partial response, and one patient developed progressive disease without response. On follow-up, three patients (27.2%) developed progressive disease after treatment. We evaluated the the response after SABR. Our data also showed the timing of response after SABR.

야지환경에서 연합형 필터 기반의 다중센서 융합을 이용한 무인지상로봇 위치추정

최지훈,박용운,주상현,심성대,민지홍,Choi, Ji-Hoon,Park, Yong Woon,Joo, Sang Hyeon,Shim, Seong Dae,Min, Ji Hong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5

This paper presents UGV localization using multi-sensor fusion based on federated filter in outdoor environments. The conventional GPS/INS integrated system does not guarantee the robustness of localization because GPS is vulnerable to external disturbances. In many environments, however, vision system is very efficient because there are many features compared to the open space and these features can provide much information for UGV localization. Thus, this paper uses the scene matching and pose estimation based vision navigation, magnetic compass and odometer to cope with the GPS-denied environments. NR-mode federated filter is used for system safety. The experiment results with a predefined path demonstrate enhancement of the robustness and accuracy of localization in outdoor environments.

FFT-FEM을 이용한 자동차용 디스크 브레이크의 열 해석

최지훈,김도형,이인,Choi, Ji-Hoon,Kim, Do-Hyung,Lee, In 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.8

Transient thermal analysis of a three-dimensional axisymmetric automotive disk brake is presented in this paper. Temperature fields are obtained using a hybrid FFT-FEM scheme that combines Fourier transform techniques and finite element method. The use of a fast Fourier transform algorithm can avoid singularity problems and lead to inexpensive computing time. The transformed problem is solved with finite element scheme for each frequency domain. Inverse transforms are then performed for time domain solution. Numerical examples are presented for validation tests. Comparisons with analytical results show very good agreement. Also, a 3-D simulation, based upon an automotive brake disk model is performed.

유한요소해석을 통한 복합병렬전단벽 접합부의 성능평가방안에 대한 해석적 연구

최지훈,배백일,최창식 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9

The purpose of this study is to find out characteristics for behavior of hybrid coupled shear wall using FEM. Determining optimized length of hybrid coupled shearwalls, a couple of parameters are investigated, compressive strength of concrete, fiber volume fraction, and embedded length. According to analysis result, embedded depth can be designed by shorten length against the ASCE proposed embedded depth. This results suggest that optimization should be needed to design hybrid coupled shearwall eco-nonically.

다중센서 융합기반 소형로봇 자율복귀에 대한 연구

최지훈,강신천,김준,심성대,지태영,송재복,Choi, Ji-Hoon,Kang, Sin-Cheon,Kim, Jun,Shim, Sung-Dae,Jee, Tae-Yong,Song, Jae-Bok 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3

Unmanned ground vehicles may be operated by remote control unit through the wireless communication or autonomously. However, the autonomous technology is still challenging and not perfectly developed. For some reason or other, the wireless communication is not always available. If wireless communication is abruptly disconnected, the UGV will be nothing but a lump of junk. What was worse, the UGV can be captured by enemy. This paper suggests a method, autonomous return technology with which the UGV can autonomously go back to a safer position along the reverse path. The suggested autonomous return technology for UGV is based on multi-correlated information based DB creation and matching. While SUGV moves by remote-control, the multi-correlated information based DB is created with the multi-sensor information; the absolute position of the trajectory is stored in DB if GPS is available and the hybrid MAP based on the fusion of VISION and LADAR is stored with the corresponding relative position if GPS is unavailable. In multi-correlated information based autonomous return, SUGV returns autonomously based on DB; SUGV returns along the trajectory based on GPS-based absolute position if GPS is available. Otherwise, the current position of SUGV is first estimated by the relative position using multi-sensor fusion followed by the matching between the query and DB. Then, the return path is created in MAP and SUGV returns automatically based on the MAP. Experimental results on the pre-built trajectory show the possibility of the successful autonomous return.

무인로봇 정밀위치추정을 위한 전술통신 및 영상 기반의 통합항법 성능 분석

최지훈,박용운,송재복,권인소,Choi, Ji-Hoon,Park, Yong-Woon,Song, Jae-Bok,Kweon, In-So 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.2

This paper presents a navigation system based on the tactical communication and vision system in outdoor environments which is applied to unmanned robot for perimeter surveillance operations. GPS errors of robot are compensated by the reference station of C2(command and control) vehicle and WiBro(Wireless Broadband) is used for the communication between two systems. In the outdoor environments, GPS signals can be easily blocked due to trees and buildings. In this environments, however, vision system is very efficient because there are many features. With the feature MAP around the operation environments, the robot can estimate the position by the image matching and pose estimation. In the navigation system, thus, operation modes is switched by navigation manager according to some environment conditions. The experimental results show that the unmanned robot can estimate the position very accurately in outdoor environment.

W-Band 다이오드 검출기 설계

최지훈(Ji-Hoon Choi),조영호(Young-Ho Cho),윤상원(Sang-Won Yun),이진구(Jin-Koo Rhee) 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.3

본 논문에서는 저잡음 증폭기와 무바이어스 쇼트키 다이오드를 사용하여 W-Band에서 동작하는 밀리미터파 다이오드 검출기를 설계, 제작하였다. 향상된 감도 특성을 얻기 위해 다이오드 검출기는 검출기와 저잡음 증폭기로 구성된다. 저잡음 증폭기단은 발진을 제거하기 위해, 높은 저지 대역 특성을 갖도록 설계된 하우징에 저잡음 증폭기 MMIC 칩을 사용해 제작한다. 다이오드 검출기단은 단순한 구조를 사용하기 위해 무바이어스 쇼트기 다이오드를 사용하고, 저잡음 증폭기단과의 연결을 용이하도록 하기 위해 평면형으로 설계한다. 설계 및 제작된 W-band 검출기는 입력 전력 -45~-20 ㏈m의 변화에 대하여 20~500 ㎷의 출력 전압을 얻었다. 본 검출기는 수동 밀리미터파 영상 시스템에 적용할 수 있다. In this paper, a millimeter-wave detector using zero-bias schottky diode is designed and fabricated at W-band. It consists of LNA(Low Noise Amplifier) and detector module to improve sensitivity. LNA case with a highly stop-band characteristic is designed to prevent the oscillation by LNA MMIC chip. Diode detector of planar structure is fabricated for the easy connection with LNA module and zero bias Schottky diode is utilized. In practice, the fabricated diode detector have shown the detection voltage of 20~500 ㎷ to the RF input power of -45~-20 ㏈m. The proposed W-band detector can be applicable to the passive millimeter image system.

QR 코드를 이용한 AR 스마트 피난 안내도

최지훈(Ji-Hoon Choi),김윤지(Yun-Ji Kim),한승주(Seung-Ju Han),이현(Hyun Lee) 한국디지털콘텐츠학회 2024 한국디지털콘텐츠학회논문지 Vol.25 No.3

기업간 관계의 변화와 지역재구조화 - A 정보통신 도시권 협력업체들을 중심으로 -

최지훈 (Ji Hoon Choi) 한국지역사회발전학회 1996 地域社會開發硏究 Vol.21 No.1

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