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손정민(Jeongmin Son),이정훈(Jeonghun Lee),김영훈(Younghoon Kim),심규석(Kyuseok Shim) 한국정보과학회 2014 정보과학회 컴퓨팅의 실제 논문지 Vol.20 No.5
빅 데이터가 많아지면서, 맵리듀스를 이용하여 조인질의를 수행하는 다양한 연구가 이루어지고 있다. 하지만 입력 데이터의 크기가 클 때 중간 생성 데이터의 크기가 커지면서 디스크의 입출력과 네트워크 트래픽의 증가로 수행시간이 오래 걸리는 문제가 있다. 본 논문에서는 맵리듀스 프레임워크를 이용한 세타 조인에 대해 중간 생성 데이터의 크기를 최대 75%를 줄일 수 있는 향상된 세타 조인방식을 제안한다. 또한 디스크 입출력에 대한 비용모델을 제안하고 이를 세타 조인 알고리즘에 적용하여 수행시간이 가장 적게 걸리는 데이터 분할 방법을 선택하도록 한다. With growing popularity of big data, there exist many works for processing join queries using Map-Reduce. However, when the size of input data becomes large, processing time of a join query tends to grow significantly since the disk I/Os and network traffics become large due to the increase of the size of intermediate data. In this paper, to process theta-join queries using a MapReduce framework, we propose an improved theta-join algorithm which reduces up to 75% with respect to the size of intermediate result. We also propose a cost model for disk I/Os and apply the cost model to our theta-join algorithm to select the partitioning for the minimum execution time.
Effect of Low Magnetic Field on Dose Distribution in the SABR Plans for Liver Cancer
Son, Jaeman,Chun, Minsoo,An, Hyun Joon,Kang, Seong-Hee,Chie, Eui Kyu,Yoon, Jeongmin,Choi, Chang Heon,Park, Jong Min,Kim, Jung-in Korean Society of Medical Physics 2018 의학물리 Vol.29 No.2
To investigate the effect of low magnetic field on dose distribution in SABR plans for liver cancer, we calculated and evaluated the dose distribution to each organ with and without magnetic fields. Ten patients received a 50 Gy dose in five fractions using the $ViewRay^{(R)}$ treatment planning system. For planning target volume (PTV), the results were analyzed in the point minimum ($D_{min}$), maximum ($D_{max}$), mean dose ($D_{mean}$) and volume receiving at least 90% ($V_{90%}$), 95% ($V_{95%}$), and 100% ($V_{100%}$) of the prescription dose, respectively. For organs at risk (OARs), the duodenum and stomach were analyzed with $D_{0.5cc}$ and $D_{2cc}$, and the remained liver except for PTV was analyzed with $D_{mean}$, $D_{max}$, and $D_{min}$. Both inner and outer shells were analyzed with the point $D_{min}$, $D_{max}$, and $D_{mean}$, respectively. For PTV, the maximum change in volume due to the presence or absence of the low magnetic field showed a percentage difference of up to $0.67{\pm}0.60%$. In OAR analysis, there is no significant difference for the magnetic field. In both shell structure analyses, although there are no major changes in dose distribution, the largest value of deviation for $D_{max}$ in the outer shell is $2.12{\pm}2.67Gy$. The effect of low magnetic field on dose distribution by a Co-60 beam was not significantly observed within the body, but the dose deposition was only appreciable outside the body.
무선 센서 네트워크를 이용한 농업 환경 모니터링 시스템 구현
이정민(Jeongmin Lee),한재준(Jaejun Han),이은애(Eunae Lee),이홍준(Hongjun Lee),김동식(Dong Sik Kim),정범진(Beom Jin Chung),손성용(Sung-Yong Son),구이란(Iran Koo),이형재(Hyung Jae Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, we developed a wireless sensor network system to monitor the temperature and humidity of the agriculture environment. In order to construct a low-cost and low-complexity system, a narrow-bandwidth communication based on 424MHz frequency band is considered while achieving reliable wireless links. The developed system is implemented in a farm for maesil, which is sort of plum. For a slope farm environment, the system can successfully gather the measured data.
Flash LADAR 이미지에 비선형 필터를 이용한 노이즈 제거
지정민(JeongMin Jee),손효주(HyoJoo Son),김창완(ChangWan Kin),홍병우(ByungWoo Hong),최광남(KwangNam Choi) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.2
최근에 개발된 플래쉬 레이더(Flash LADAR)를 사용하여 획득한 레인지 이미지에서 노이즈를 제거하여 실시간으로 오브젝트를 구분하는 새로운 비선형 필터를 제안한다. 플래쉬 레이더는 스트레오 비전 시스템에 비해 특징이 없는 환경에서도 3차원 데이터를 손실없이 한번에 획득할 수 있는 장점이 있다. 획득된 레인지 이미지는 일정 범위 밖의 배경을 모호하게 인식하여 노이즈로 간주한다. 제안한 필터를 이용한 노이즈 제거와 관심영역을 분리하여 오브젝트를 분리하는 기본적인 방법을 제시한다. 실제 현장에서 획득한 데이터를 이용한 실험을 통해서 제안한 필터가 다양한 형태의 오브젝트 분리하는데 효과적이라는 것을 보여준다.
( Eun-joo Son ),( Eunwook Joo ),( Yeonseong Jeong ),( Yunjin Bang ),( Jeongmin Song ),( Eun-hee Yoo ),( Seon Kyung Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
A 56-year-old female was referred to our gynecological department for evaluation of the vulvar ulceration. The patient suffered from vulvar burning sensation. Physical examination revealed an approximately 7 cm in diameter exophytic cauliflower-like mass with ulcerative growth that involved the both labia minor and the perineum. And both enlarged inguinal lymph nodes were palpable. The serum squamous cell carcinoma antigen level was 4.3 ng/ml. Punch biopsy was performed and the result was reported as SCC of the vulva. Computed tomography showed an enlarged (>5mm) lymph nodes metastasis in the both groin. Due to bulky mass in the vulva, the patient underwent neoadjuvant chemotherapy(NACT) with VBP(vinblastine 4 mg/m2 plus bleomycin 25 mg and cisplatin 50 mg/m2). After the three courses of chemotherapy, the vulvar lesion was greatly reduced in size, while the both groin lymphadenopathy remained unchanged. Subsequently, a radical vulvectomy with bilateral inguinofemoral lymphenectomy was performed. The final histopathological reports of the surgical specimen demonstrated a moderately-differentiated invasive squamous cell carcinoma with negative resection margin. Lymph nodes were positive for metastasis (right inguinal: 3/8, left inguinal: 1/7). 2 month later the surgery, the patient received adjuvant radiotherapy of the vulvar and inguinal regions bilaterally. (external-beam irradiation, 1.8 Gy/day in 25 fractions over 5 weeks ; total radiation dose, 45.0 Gy) Optimal treatment of locally advanced, inoperable vulvar cancer is still debatable. Our case illustrates that NACT with VBP showed significantly decreasing in tumor burden with manageable toxicity. In conclusion, NACT with VBP may increase surgical feasibility in initially unresectable tumor, decrease the deleterious side effect of radiotherapy. Therefore, the use of neoadjuvant chemotherapy followed by surgery could be considered as a therapeutic option for locally advanced vulvar cancer.