OpenGL 명령어 캡쳐를 통한 Java3D 복원

박수호(Suho Park),정기숙(GiSook Jung),권순일(SoonIl Kwon),최현미(HyunMi Choi),박찬(Chan Park),고영덕(YoungDuke Koh),정순기(SoonKi Jung) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A

최근 유비쿼터스 게임의 성장과 더불어 이기종의 환경에서 새로운 기법들로 보여질 수 있는 연구가 활발히 진행되고 있다. 본 논문에서는 이기종 환경에서 임의의 OpenGL 기반의 PC 게임이나 게임 뷰어가 있는데서 Java3D 형태로 재복원해서 볼 수 있는 방법을 제안한다. 결과적으로 구조적인 장면 그래프에서 사건을 처리하고, Parser에서 OpenGL Primitive들의 정점 정보를 해석해서 계층 구조를 변화시킴으로서 보다 빠른 실시간 렌더링을 구현하고자 한다.

백색왜성 PG1159-035 광도측정 데이터에 관한 통계적 패턴분석

박석윤,이순기,정현용,김규영,조한석,김석,박민우 충남대학교 기초과학연구소 2000 忠南科學硏究誌 Vol.27 No.2

This study approached the characteristic of dwarf star through time series analysis, and compared observations with the pattern of them, using ACF and Periodogram.

In-Situ Observation of the Carburization of Solid Iron by Graphite

Minsoo Shin,Soonki Min,이준호,Jin Gyun Park,민동준 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.6

The carburization of solid iron by graphite was investigated by using confocal laser scanning microscopy to understand the initial carburization reaction mechanism of solid iron by solid carbon at high temperatures. As the carburization was initiated, a liquid layer was formed at the interface and grew parallel to the interface after an incubating period for the liquid phase formation. This required incubation time decreased with an increasing temperature due to the decrease in the solubility limit of carbon in γ-Fe. A moving interface model was used to interpret the carburization and melting behavior of solid iron by solid carbon with consideration for the diffusion of carbon in both solid and liquid phases. Using the moving interface model, the diffusion coefficient of carbon in the liquid Fe-C alloys was obtained. {1458-1623K}The rate of carburization in the solid and liquid phases was evaluated. As the liquid phase was formed, the contribution of solid phase in the carburization decreased from 9.5% at 1.3 s to 5.4% by 20 s.

전력계통 동요시 고장 구분

장성익(Sungik Jang),박순규(Soonky Park),이종주(Jongjoo Lee),정호성(Hosung Jung),신명철(Myungchol Shin) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.7

석탄-중유 혼소 발전소의 CO2 배출량 계산

이상중(Sangjoong Lee),김순기(Soonki Kim),양성덕(Seongdeog Yang),박건복(Gunbook Park) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월

G8 summit meeting was held in July 2008 and decided to set up a long-term goal, by 2050, reducing the greenhouse emissions by half of those in 1990. In November am, Korea government pronounced to reduce the national CO₂ emission by 30% of BAU by 2020. Power industries in Korea produce most of its electricity by burning fossil fuels, and emit approximately 28% of national CO₂ emissions. Therefore, it is very important to calculate CO₂ emissions of electric power plants. In this paper, we present a method to calculate the hourly CO₂ emission for a thermal power plant burning mixture of coal and oil, using the performance test data and coal-oil mix rate. An example for calculating the CO₂ emissions per hour is also demonstrated.

사용자 입력 기반의 다중 시점 영상 생성

최민석(Minsuk Choi),박민우(Minwoo Park),장경호(Kyungho Jang),정순기(Soonki Jung) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1C

하나의 긴 장면의 영상은 그 장면을 촬영한 여러 개의 단일 영상들을 정합하여 만들어 진다. 다중 시점(multi-perspective) 영상은 시점이 다른 곳에서 촬영된 영상들을 합쳐 하나의 영상 내에서 여러 시점표현을 가능하게 한 영상이다. 그러므로 다중 시점 영상을 생성하면 물체에 대한 전체적인 모습을 한 장의 영상으로 파악할 수 있다. 다중 시점 영상 생성에서 중요한 문제 중의 하나는 다중 시점의 영상을 어떻게 배치하느냐 하는 것이다. 이는 곧 가상 시점을 어떻게 하느냐의 문제와 동일하다. 또한 생성된 영상의 시점을 사용자가 임의로 수정하는 기능을 부여하였다. 본 논문에서 제시한 사용자 입력 기반의 방법은 기존의 다중 시점 영상생성에 소요되는 시간을 대폭 줄일 수 있고, 사용자가 원하는 임의의 깊이 값을 가지는 다중 시점 영상을 얻을 수 있다.

개방형 지열에너지 설비 지열이용검토서 분석 및 개선방안 연구

공형진(Hyoung Jin Kong),박준모(Jun Mo Park),권순기(SoonKi Kwon) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

Standing Column Well(SCW) heat pump system can achieve higher performance of the system by utilizing heat source of the annual constant groundwater temperature. The performance of SCW system depends on the ground thermal and hydraulic characteristic. In this study, we analyzed loop pump power, secondary pump power and coefficient of performance through SCW heat pump system geothermal energy evaluation report. As a result, the average cooling load of the SCW system was 1,055.4 kW and heat pump installation capacity increased by 112.1% to 1198.6 kW. And the average power requirement for loop pump was 34.2 W/kW and the power requirement for 2nd pump was 13.1 W/kW. At the time of cooling, heat pump COP was 4.64, system COP 3.77, during the heating, heat pump COP 4.08 and system COP was 3.46.

Method validation of microplastics in food

Jin-Woo Kim,Jung-Hwan Kwon(권정환),Thanh Dat Pham,Jaehak Jung,Soonki Hong,Sang-Hwa Lee,Byung-Tae Lee,Hee-Jin Park,Min-Young Chae 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5

It has been known that consumption of foods is an important pathway of microplastics intake in humans. Because of the complexity of food matrices, however, it is very difficult to develop standard experimental methods to isolate microplastics from foods and to identify them using spectroscopic methods such as Fourier-transform infrared spectroscopy. In this study, we optimized pretreatment methods for three representative food matrices – sea salts, soy sources, and salted fish eggs – representing dissolvable inorganic foods, liquid foods, and solid foods, respectively. Methods worked robustly in a laboratory in which the original methods have been optimized. For further validation of the methods, a small scale ring test was planned in five independent laboratories with different instruments. Standard microplastics of high-density polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and polyamide 6 in 60-100 μm were prepared using a mixing extruder from pristine plastic pellets. They were randomly spiked into three food matrices and the spiked samples were transported to the test laboratories. Comparing the results, the validity and robustness of the optimized methods will be examined.

L-spine Bone SPECT/CT에서 획득된 저선량 CT 영상을 이용한 용적 골밀도 결과의 유용성

고현수,박순기,김은혜,최종숙,정우영,이동윤,Hyunsoo Ko,Soonki Park,Eunhye Kim,Jongsook Choi,Wooyoung Jung,Dongyun Lee 대한핵의학기술학회 2023 핵의학 기술 Vol.27 No.2

Purpose: CT scan makes up for the weak point of the nuclear medicine image having a low resolution and also were used for attenuation correction on image reconstruction. Recently, many studies try to make use of CT images additionally, one of them is to measure the bone mineral density(BMD) using Quantitative CT(QCT) software. BMD exams are performed to scan lumbar and femur with DXA(Dual-Energy X-Ray Absorptiometry) in order to diagnose bone disease such as osteopenia, osteoporosis. The purpose of this study is to identify the usefulness of QCT_BMD analyzed with low dose CT images on L-spine Bone SPECT/CT comparing with DXA_BMD. Materials and Methods: Fifty five women over 50 years old (mean 66.4 ± 9.1) who took the both examinations(L-spine Bone SPECT/CT with SIEMENS Intevo 16 and DXA scan with GE Lunar prodigy advance) within 90 days from April 2017 to July 2022, BMD, T-score and disease classification were analyzed. Three-dimensional BMD was analyzed with low dose CT images acquired on L-spine Bone SPECT/CT scan on Mindways QCT PRO^TM software and two-dimensional BMD was analyzed on DXA scan. Basically, Lumbar 1-4 were analyzed and the patients who has lesion or spine implants on L-spine were excluded for this study. Pearson's correlation analysis was performed in BMD and T-score, chi-square test was performed in disease classification between QCT and DXA. Results: On 55 patients, the minimum of QCT_BMD was 18.10, maximum was 166.50, average was 82.71 ± 31.5 mg/cm³. And the minimum of DXA-BMD was 0.540, maximum was 1.302, average was 0.902 ± 0.201 g/cm², respectively. The result shows a strong statistical correlation between QCT_BMD and DXA_BMD(p<0.001, r=0.76). The minimum of QCT_T-score was -5.7, maximum was -0.1, average was -3.2 ± 1.3 and the minimum of DXA_T-score was -5.0, maximum was 1.7, average was -2.0 ± 1.3, respectively. The result shows a statistical correlation between QCT T-score and DXA T-score (p<0.001, r=0.66). On the disease classification, normal was 5, osteopenia was 25, osteoporosis was 25 in QCT and normal was 10, osteopenia was 25, osteoporosis was 20 in DXA. There was under-estimation of bone decrease relatively on DXA than QCT, but there was no significant differences statistically by chi-square test between QCT and DXA. Conclusion: Through this study, we could identify that the QCT measurement with low dose CT images QCT from L-Spine Bone SPECT/CT was reliable because of a strong statistical correlation between QCT_BMD and DXA_BMD. Bone SPECT/CT scan can provide three-dimensional information also BMD measurement with CT images. In the future, rather than various exams such as CT, BMD, Bone scan are performed, it will be possible to provide multipurpose information via only SPECT/CT scan. In addition, it will be very helpful clinically in the sense that we can provide a diagnosis of potential osteoporosis, especially in middle-aged patients.

T-Cache : 시계열 배관 데이타를 위한 고성능 캐시 관리자

신제용(Jeyong Shin),이진수(Jinsoo Lee),김원식(Wonsik Kim),김선효(Seonhyo Kim),윤민아(Mina Yoon),한욱신(Wook-Shin Han),정순기(SoonKi Jung),박세영(Se-Young Park) 한국정보과학회 2007 정보과학회 컴퓨팅의 실제 논문지 Vol.13 No.5

지능형 배관 검사체(PIG)는 가스나 기름 배관 안을 지나가며 검사체에 장착된 여러 센서로부터 신호(센서 데이타로 불림)들을 취합하는 장치이다. PIG로부터 취합된 센서데이타들을 분석함으로써, 배관의 구멍, 뒤틀림 또는 잠재적으로 가스 폭발의 위험을 가지고 있는 결함들을 발견할 수 있다. 배관의 센서 데이타를 분석가가 분석을 할 때에는 주로 두 가지 분석 패턴을 사용한다. 첫 번째는 센서 데이타를 순차적으로 분석하는 순차적 분석 패턴이고, 두 번째는 특정한 구간을 반복해서 분석하는 반복적 분석 패턴이다. 특히, 센서 데이타를 분석할 때 반복적 분석 패턴이 많이 사용된다. 기존의 PIG 소프트웨어들은 사용자의 요청이 있을 때 마다 서버로부터 센서 데이타들을 오므로, 매 요청마다 네트워크 전송비용과 디스크 액세스 비용이 든다. 이와 같은 방법은 순차적 분석 패턴에는 효율적이지만, 분석 패턴의 대부분을 차지하는 반복적 분석 패턴에는 비효율적이다. 이와 같은 문제는 서버/클라이언트 환경에서 다수의 분석가가 동시에 분석을 할 경우에는 매우 심각해진다. 이러한 문제점을 해결하기 위해 본 논문에서는 배관 센서 데이타들을 여러 개의 시계열 데이타로 생각하고, 효율적으로 시계열 데이타를 캐싱 하는 T-Cache라 부르는 주기억장치 고성능 캐시 관리자를 제안한다. 본 연구는 클라이언트 측에서 시계열 데이타를 캐싱하는 최초의 연구이다. 먼저, 고정된 거리의 시계열 데이타들의 집합을 캐싱 단위로 생각하는 신호 캐시 라인이라는 새로운 개념을 제안하였다. 다음으로, T-Cache에서 사용되는 스마트 커서와 여러 알고리즘을 포 함하는 여러 가지 자료구조를 제안한다. 실험 결과, 반복적 분석 패턴의 경우 T-Cache를 사용하는 것이 디스크 I/O측면과 수행 시간 측면에서 월등한 성능 향상을 보였다. 순차적 분석 패턴의 경우에도 T-Cache를 사용하지 않은 경우와 거의 유사한 성능을 보였다. 즉, 캐시를 사용함으로써 발생하는 추가비용은 무시할 수 있음을 보였다. Intelligent pipeline inspection gauges (PIGs) are inspection vehicles that move along within a (gas or oil) pipeline and acquire signals (also called sensor data) from their surrounding rings of sensors. By analyzing the signals captured in intelligent PIGs, we can detect pipeline defects, such as holes and curvatures and other potential causes of gas explosions. There are two major data access patterns apparent when an analyzer accesses the pipeline signal data. The first is a sequential pattern where an analyst reads the sensor data one time only in a sequential fashion. The second is the repetitive pattern where an analyzer repeatedly reads the signal data within a fixed range; this is the dominant pattern in analyzing the signal data. The existing PIG software reads signal data directly from the server at every user's request, requiring network transfer and disk access cost. It works well only for the sequential pattern, but not for the more dominant repetitive pattern. This problem becomes very serious in a client/server environment where several analysts analyze the signal data concurrently. To tackle this problem, we devise a fast in-memory cache manager, called T-Cache, by considering pipeline sensor data as multiple time-series data and by efficiently caching the time-series data at T-Cache. To the best of the authors' knowledge, this is the first research on caching pipeline signals on the client-side. We propose a new concept of the signal cache line as a caching unit, which is a set of time-series signal data for a fixed distance. We also provide the various data structures including smart cursors and algorithms used in T-Cache. Experimental results show that T-Cache performs much better for the repetitive pattern in terms of disk I/Os and the elapsed time. Even with the sequential pattern, T-Cache shows almost the same performance as a system that does not use any caching, indicating the caching overhead in T-Cache is negligible.