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윤성현,Yun, Seong-Hyeon 한국데이터베이스진흥원 2006 디지털콘텐츠 Vol.10 No.-
다른 게임 장르에 비해 RPG란 장르는 상대적으로 유저의 평균체류시간이 길다. 이는 RPG의 특성상 FPS나 RTS장르처럼 단판 위주의 게이미 아니라 광활한맵을 이동하면서 사냥과 퀘스트가 끊임없이 반복되기 때문이다. 그러나 같은 RPG라 할지라도 게임마다 특성이 다르기 때문에 평균체류시간은 다르게 나타나고 있다.현재까지 게임마다 평균체류시간이 다르게 나타난다는 것은 잘 알려진 사실이다. 그러나 이에 대한 원인분석이나 체계적인 연구가 부족했던 것 또한 사실. 이는 RPG장르 내 어떤 요인들이 평균체류시간에 영향을 미치는가에 대한 실증분석이 전무한 상태에서 막연한 '감' 에 의한 평가가 대부분이었기 때문이다. 여기서는 지난 5월 30일을 기준으로 게임트릭스에 등록된 86개의 MMORPG중에서 이미 서비스가 종료됐거나 과거 1년 동안 갑작스럼 패치, 업그레이드등으로 데이터 손실이 많았던 게임, 그리고 데이터를 구할 수 없었던 게임들을 제외한 총 51개의 MMORPG를 대상으로 평균체류시간을 분석했다.
윤성현 ( Yun Seong Hyeon ),남광우 ( Nam Gwang U ) 한국지리정보학회 2003 한국지리정보학회지 Vol.6 No.4
In the paper, we describe the query extension techniques for spatiotemporal query functionalities on object-relational DBMS. The spatial objects in real world change the shapes over time. Spatiotemporal databases support to manage a temporal dimension as well as a spatial dimension for history of the objects. The proposed techniques can make conventional object-relational databases to support spatiotemporal databases system by the implementation and inheritance of abstract data types. We define and implement spatial and temporal classes as superclass. And, spatiotemporal classes inherits and extends the classes. The proposed extensions make it easy that conventional database systems not only are transformed into the spatiotemporal database systems, but also do not need to be changed to support spatiotemporal application.
윤성현(Seong-Hyeon Yun),이흥규(Hungkyu Lee),박종경(Jong-Kyung Park) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.4
본 논문에서는 GNSS 단일기선해석과 망조정을 통한 측량기준점 성과 산정에서 종속기선 포함여부가 미치는 영향을 분석하기 위해 망조정 이론을 바탕으로 실험적인 연구를 수행하였다. 이를 위해 국토지리정보원 운영 위성기준점 50 개소의 관측데이터를 이용하여 종속기선 포함여부에 따라 3가지 형태의 기준점 측량망 구성 및 조정실험을 수행하고, 그 결과를 정확도 표현과 산정성과의 차이 측면에서 분석 하였다. GNSS 망조정에 종속기선을 포함하는 경우 조정성과 차이는 밀리미터 수준으로 매우 제한적이었으나, 망의 자유도와 기하강도 왜곡으로 그 정확도가 과대평가되는 결과를 얻었다. 3가지 경우에 대한 조정성과를 국토지리정보원 고시좌표와 비교했으며, 그 결과 독립기선으로만 이루어진 망의 성과가 가장 높은 일치성을 보였다. 그러나 종속기선을 포함한 조정결과는 상대적으로 큰 차이를 나타내어 성과의 정확도 표현에 왜곡이 있음을 확인할 수 있었다. 이와 같은 분석결과에 따라 GNSS 단일기선해석으로 얻어진 기선벡터의 망조정에서는 기존 성과와의 일치성, 현실적인 정확도 표현 그리고 과대한 데이터 처리에 따른 시간 및 비용 부담을 고려할 때 종속기선을 제외하는 것이 타당할 것으로 판단된다. This study examined the impact of trivial baselines obtained from GNSS single-baseline processing into a network adjustment in terms of accuracy and estimated coordinates sets. To this end, depending on the inclusion of the dependent baselines, three different types of experimental GNSS networks were composed and adjusted. The results showed that the networks including the trivial baselines are generally overestimated, but differences in the derived coordinates are limited at the millimeter level. A comparison of the adjusted coordinates with those published by the national geodetic agency showed that results of the network consisting of only the independent baselines are more constant than those of the networks with trivial baselines. Finally, a trivial baseline should be excluded from the GNSS network adjustment with a consideration of the realistic accuracy presentation and data processing burden.
김용일,이준호,윤성현,노성훈,민진식,Kim, Yong-Il,Lee, Jun-Ho,Yun, Seong-Hyeon,Noh, Sung-Hoon,Min, Jin-Sik 대한위암학회 2001 대한위암학회지 Vol.1 No.2
Purpose: The common features of brain metastases from gastric cancer are unknown because brain metastasis is an uncommon pattern of metastasis. The purpose of this study was to investigate the clinical features of and the prognosis for patients with brain metastases after a curative resection for gastric cancer. Materials and Methods: Twenty-one (21) cases of patients with brain metastases of gastric cancer, who had been treated at the Department of Surgery, Yonsei University College of Medicine, were assessed retrospectively. Results: The mean age was $55.8\pm9.6$ years (range: $34\~70$ years), and the male-to-female ratio was 2.5 : .1. The most common neurologic symptom was headache ($38.5\%$), and no patient was free from the neurologic symptoms. The incidence of parenchymal metastasis (PM: $76.2\%$) was higher than that of leptomeningeal metastasis (LM: $19.0\%$). Patients with gastric cancer and brain metastasis showed high rates of blood and lymphatic vessel invasion (lymphatic vessel invasion: $85.7\%$; blood vessel invasion: $80.9\%$). According to Lauren's classification, the incidence of intestinal types was 14/21 ($66.7\%$), that of diffuse types was 3/21 ($14.3\%$) and that of mixed types was 4/21 ($19.0\%$). The mean interval between the gastrectomy and the diagnosis of brain metastasis was $24.7\pm4.0$ months (PM: 26.8 months; LM: 20.3 months). The median period of survival after diagnosis of brain metastasis was 2 months for paren chymal metastasis and 0 months for leptomeningeal metastasis. Conclusion:.. During a follow-up period, patients with neurologic symptoms should be suspected of having brain metastasis. Early diagnosis and treatment is the only hope to prolong survival in such patients.
갈색세포종의 외과적 치료에서 복강경수술과 전통적인 개복수술 간의 비교 분석
신현백,임혜인,길원호,최준호,이정언,윤성현,허진석,김지수,노재형,남석진,최성호,김성주,전호경,이석구,양정현,김정한,Hyun-Baek Shin,Hye-In Lim,Won-ho Kil,Jun-Ho Choe,Jeong-Eon Lee,Seong-Hyeon Yun,Jin-Seok Heo,Jee-Soo Kim,Jae-Hyung Noh,Seok-Jin Nam,Seong 대한갑상선-내분비외과학회 2008 The Koreran journal of Endocrine Surgery Vol.8 No.2
<B>Purpose:</B> This study comparedthe effectiveness and safety of laparoscopic adrenalectomy with conventional open adrenalectomy for the treatment of pheochromocytoma. <B>Methods:</B> Medical records of 100 patients who underwent surgical removal of pheochromocytoma (open adrenalectomy, n=59; laparoscopic adrenalectomy, n=39) at Samsung Medical Center from June 1995 to August 2007 were retrospectively reviewed. <B>Results:</B> To draw an appropriate comparison, patients with a tumor less than 7 cm in size were evaluated (open adrenalectomy, n=23; laparoscopic adrenalectomy n=31). No statistically significant differences were evident according to age, gender and tumor size. The mean operating time was 158 min for the open surgery group and 114 minfor the laparoscopic group (P<0.01). The mean postoperative hospital stay was 10.4 days following open surgery and 5.6 days following laparoscopic surgery (P<0.01). The mean volume of the estimated blood loss for the laparoscopic surgery group (482 ml) was less than for the open surgery group (mean 229 ml) (P=0.06), and the time to first oral intake was 1.7 days after laparoscopic adrenalectomy and 3.5 days after open surgery (P<0.01). The frequency of using analgesics for postoperative pain after laparoscopic adrenalectomy was markedly lower than following conventional open adrenalectomy. There was no recurrence or complications during the follow-up periods (mean: 30 mon</B>ths). <B>Conclusion:</B> Laparoscopic adrenalectomy offers advantages of less postoperative pain, shorter operative time and a shorter hospital stay as compared with conventional open adrenalectomy. Laparoscopic adrenalectomy for treating pheochromocytoma is a minimally invasive alternative to conventional open adrenalectomy. <B>(Ko</B><B>rean J En</B><B>do</B><B>crine Surg 2008;8:106-111)</B>