新羅上古 三姓集團의 王位繼承에 대한 考察

權大石 진주여자전문대학 1989 論文集 Vol.11 No.-

趙浚의 改革思想에 관한 考察

權大石 진주여자전문대학 1992 論文集 Vol.15 No.-

初期新羅 三姓集團의 戰役과 征服活動에 대한 考察

權大石 진주여자전문대학 1989 論文集 Vol.11 No.-

DAVRID 시스템 상에서 행렬 곱셈 분석에 기초한 다중처리와 다중스레딩 결정

권대석(Daesuk Kwon),장준호(Juno Chang),김흥환(Heunghwan Kim),한상영(Sangyong Han) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.10

많은 다중스레드 병렬처리 시스템이 병렬성을 이용하고 통신과 계산을 중첩 수행함으로써 성능 개선을 도모하려 한다. 하지만 단순한 다중스레드 병렬처리 방식은 그로인해 수반되는 성능 저하 요소들로 인하여 성능상의 개선을 얻는데 실패하는 경우가 많다. 이 논문에서는 본 연구진이 다중스레드 병렬처리 시스템인 DAVRID를 개발하는 과정에서 얻은 경험에 근거하여 다중스레딩을 채용하고 있는 병렬처리 시스템이 보일 수 있는 성능저하 요인을 제시하고, 다중스레딩과 병렬처리의 결정이 어떻게 이루어져야 하는가에 대해 기술한다. 다중스레딩과 병렬처리를 위해 추가적으로 발생하는 성능 저하 요인에 기초하여, 기존의 DAVRID 컴파일러가 생성해낸 행렬 곱셈 코드가 왜 느린가를 분석하고, 분석결과 드러난 문제를 해결할 수 있는 새로운 코드를 생성한 후 이를 다시 실행하여 분석하였다. 새로이 코딩된 코드는 원래의 코드에 비해 12.5배의 성능 향상을 보였다. Many multithreaded multiprocessing systems have been developed to exploit parallelism and improve performance by overlapping the computations and communications. However, the naive multithreaded multiprocessing schemes were not as successful as many researchers expected, In this paper, based on our experience in a multithreaded multiprocessing system DAVRlD, we identify some reasons for poor performance and the compiler requirements for performance improvement. We realized that the decisions for multithreading and multiprocessing should be based on the overhead information. Based on the overhead parameters, we obtained a hand-compiled code which was equivalent to the original code. It was 12.5 times as fast as the original one.

로마共和政 末期 無産大衆의 生活相에 관한 硏究

權大石 진주여자전문대학 1982 論文集 Vol.4 No.-

이기종 병렬 시스템을 위한 자동적 병렬화 컴파일러 후위

권대석(Daesuk Kwon),김흥환(Heunghwan Kim),한상영(Sangyong Han) 한국정보과학회 2000 정보과학회논문지 : 시스템 및 이론 Vol.27 No.8

고전적 시스템의 성능 향상을 위해 많은 병렬 처리 시스템들이 제안되어 왔다. 그러나 이들 시스템들은 흔히 통신과 동기화 부담을 과소 평가함으로써 기대한 만큼의 성능을 보이지 못하였다. 본 논문에서는 그러한 결과를 초래하는 이유를 설명하고, 병렬화 컴파일러가 만족시켜야 하는 성능상의 요구조건을 제시한다. 병렬화 결정은 성능 저하를 피하기 위해 반드시 통신과 동기화 부담(overhead)에 대한 분석에 기초하여 이루어져야 한다. 본 연구진은 이러한 발상을 자동적 병렬화 컴파일러 SUIF에 적용하여 SUIF의 후위를 MPI 함수를 이용하는 새로운 후위로 교체하고, 여기에 병렬화 결정의 타당성을 부담 정보에 기초하여 평가하는 능력을 부여하였다. 새로운 컴파일러 후위는 병렬화 가능한 부분이 명시된 SUIF 중간 코드를, 성능 저하를 초래하지 않으면서 MPI 함수 호출을 포함하는 분산 메모리 구조 병렬 프로그램으로 변환한다. Many multiprocessing systems have been developed to exploit the parallelism and to improve the performance. However, the naive multiprocessing schemes were not successful as many researchers thought, due to the heavy cost of communication and synchronization resulting from parallelization. In this paper, we will identify the reasons for the poor performance and the compiler requirements for the performance improvement. We realized that the decisions for multiprocessing should be derived by the overhead information. We applied this idea to the automatic parallelizing compiler, SUIF. We substituted the original backend of SUIF with our backend using MPI, and gave it the capability to validate parallelization decisions based on overhead parameters. This backend converts the intermediate code containing spacification of parallelizable regions into the distributed-memory based parallel program with MPI function calls without excessive parallelization that may cause performance degradation.

咸安 郡北地域 出土 陶質土器에 대한 考察

權大石,朴升圭 진주여자전문대학 1991 論文集 Vol.14 No.-

Haman-Kunbuk region is the oldest part of Ara-Gara, and has done an easytransation with the neighboured area through the east of the Nam River. Recently, we could confirm the advantage of pottery of this region, Sado-Ri, and particularly could make out the deeper relations with Chinju Area. The most important remains are Myungkwan-Ri, Wonbuk-Ri and so forth. At 1st stage, the latter part of 4th century to the former of 5th centrury, there must have been interchange with Chinju basin. At 2nd stage, the latter 5th century to the former of th 6th century, the above regions were divided into two parts, and them Haman began to show a sort of regional individuality.

태양광전원이 연계된 배전계통 보호협조기기의 부동작패턴 탐색알고리즘에 관한 연구

권순환(Soon-Hwan Kwon),태동현(Dong-Hyun Tae),이후동(Hu-Dong Lee),노대석(Dae-Seok Rho) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.9

최근, 기후변화와 미세먼지 등에 의한 지구규모적인 환경문제를 해결하기 위하여, 정부에서는 RE 3020 정책을 시행하고 있으며, 이에 따라 대용량의 태양광전원이 배전계통에 연계되고 있다. 하지만, 대용량 태양광전원이 배전계통에 연계되는 경우, 태양광전원의 연계위치와 용량, 연계방식 및 고장지점에 따라 사고전류의 크기와 방향이 변하게 되고, 지락사고가 발생하여도 분류효과에 의하여 보호협조기기가 동작하지 않는 부동작 현상이 발생할 가능성이 있다. 따라서, 본 논문에서는 다수의 태양광전원이 배전계통에 연계되어 운용되는 경우, 리클로저(recloser, 이하 R/C)의 설치개소에 따라 보호협조기기가 동작하지 않는 부동작 메커니즘을 제시하고, 이를 바탕으로 다양한 시나리오에 기반한 보호협조기기의 부동작 패턴탐색 알고리즘을 제안한다. 또한, 보호협조 전용 해석 프로그램인 Off-DAS를 이용하여, 다수의 태양광전원이 연계된 배전계통 모델링을 수행하고, 이를 바탕으로 다양한 시나리오에 따른 보호협조기기 부동작 패턴을 분석한다. 제안한 보호협조기기의 부동작패턴 탐색알고리즘 및 모델링을 바탕으로 시뮬레이션을 수행한 결과, R/C의 설치개소 및 태양광전원의 연계 패턴에 따라 부동작 현상이 발생함을 알 수 있어, 본 논문의 유용성을 확인하였다. Recently, the Korean government developed the RE3020 (renewable energy) policy to overcome environmental problems, such as fine dust, climate change, and large-scale PV systems interconnected with a distribution system. When a large-scale PV system is interconnected in the distribution system, however, a malfunction can occur, and the protection devices may not be operated because of the dividing effect depending on the magnitude and direction of fault current as well as connection types and location of the PV system. Therefore, this paper proposes a search algorithm for the malfunction pattern of protection devices based on various scenarios, when large-scale PV systems are operated and interconnected in a distribution system. This paper presents a malfunction mechanism of protection devices according to the installation locations of recloser (R/C). Furthermore, the modeling of a distribution system with large-scale PV systems was performed using Off-DAS S/W, and the malfunction patterns of protection devices were analyzed based on a range of scenarios. From the simulation results with the proposed model and algorithm for searching for protection devices, it was confirmed that they are useful and effective in identifying a malfunction phenomenon depending on the installation location of the R/C and connection type of PV system.

하악 부위에 병발된 구강 편평 상피 세포암종에 대한 절제술부터 재건까지의 연속 치료방식: 증례 보고 및 문헌고찰

권진주,마윤희,황대석,유미현,김욱규 대한구강악안면병리학회 2021 대한구강악안면병리학회지 Vol.45 No.2

Worldwide, oral cancer accounts for 2%–4% of all cancer cases. It is estimated that more of 90% of all oral neoplasms are oral squamous cell carcinoma (OSCC). The aims of this study were to evaluate follow-up outcomes in patients with OSCC invading the mandibular body bone who underwent primary radical resection and reconstructive surgery by fibular free flap or CAD-CAM T-mesh with pathological study on two cases. In this article, two cases of mandibular reconstruction in patients with OSCC invading the mandibular body bone are reported. A 68-year-old male patient visited the authors’ clinic with pain on the left mandibular region. After wide excision and segmental mandibulectomy on the mandibular OSCC, a enterocutaneous fibular free flap from right leg was used to cover the intraoral mucosal defect. The other 51-year-old female patient visited the authors’ clinic with pain on the right mandibular region. After wide excision and segmental mandibulectomy on the mandibular OSCC, reconstruction was done with a reconstruction plate and a fibula free flap from right leg. Unfortunately, fibular free flap was lost due to infection of the flap at post-operative 1month, secondary reconstruction using a custom-made type T-mesh and iliac PCBM was done to repair on the mandibular defect after four years postoperatively. The customized CAD-CAM T-mesh was made prior to the operation according to mirror image of remained jaw. Patients with OSCC invading the mandibular body bone are required an accurate segmental mandibulectomy immediate reconstructive surgery with various methods and followed by adjuvant radiation with or without chemotherapy in order to improve the quality of life through the restoration of the oral function and esthetics after surgery. Postoperative CCRT was determined according to the final pathologic findings such as lymph node metastasis and main lesion free margin safety, and this has an essential relationship in the prognosis of postoperative recurrence. We reviewed reliable treatment options on two patients of OSCC in mandible with pathologic findings.Worldwide, oral cancer accounts for 2%–4% of all cancer cases. It is estimated that more of 90% of all oral neoplasms are oral squamous cell carcinoma (OSCC). The aims of this study were to evaluate follow-up outcomes in patients with OSCC invading the mandibular body bone who underwent primary radical resection and reconstructive surgery by fibular free flap or CAD-CAM T-mesh with pathological study on two cases. In this article, two cases of mandibular reconstruction in patients with OSCC invading the mandibular body bone are reported. A 68-year-old male patient visited the authors’ clinic with pain on the left mandibular region. After wide excision and segmental mandibulectomy on the mandibular OSCC, a enterocutaneous fibular free flap from right leg was used to cover the intraoral mucosal defect. The other 51-year-old female patient visited the authors’ clinic with pain on the right mandibular region. After wide excision and segmental mandibulectomy on the mandibular OSCC, reconstruction was done with a reconstruction plate and a fibula free flap from right leg. Unfortunately, fibular free flap was lost due to infection of the flap at post-operative 1month, secondary reconstruction using a custom-made type T-mesh and iliac PCBM was done to repair on the mandibular defect after four years postoperatively. The customized CAD-CAM T-mesh was made prior to the operation according to mirror image of remained jaw. Patients with OSCC invading the mandibular body bone are required an accurate segmental mandibulectomy immediate reconstructive surgery with various methods and followed by adjuvant radiation with or without chemotherapy in order to improve the quality of life through the restoration of the oral function and esthetics after surgery. Postoperative CCRT was determined according to the final pathologic findings such as lymph node metastasis and main lesion free margin safety, and this has an essential relationship in the prognosis of postoperative recurrence. We reviewed reliable treatment options on two patients of OSCC in mandible with pathologic findings.

EM을 활용한 포러스콘크리트의 내동해성에 관한 실험적 연구

서대석(Seo, Dae Sok),박준석(Park, Jun Seok),권해경(Kwon, Hae Kyung),김화중(Kim, Wha Jung),김윤용(Kim, Yun Yung),김봉균(Kim, Bong Kyun) 한국콘크리트학회 2013 한국콘크리트학회 학술대회 논문집 Vol.2013 No.5