디지털 환경에서의 가물전시연출에 관한 연구

손원준,Genda,Etsuo 한국디지털디자인학회 2006 디지털디자인학연구 Vol.6 No.1

지자기 기반 실내 위치 추정을 위한 지자기 벡터 보정법

손원준,최린 한국차세대컴퓨팅학회 2019 한국차세대컴퓨팅학회 논문지 Vol.15 No.3

Magnetic sensors have the disadvantage that their vector values ​​differ depending on the direction. In this paper, we propose a magnetic vector calibration method for geomagnetic-based indoor localization estimates. The fingerprinting technique used in geomagnetic-based indoor localization the position by matching the magnetic field map and the magnetic sensor value. However, since the moving direction of the current user may be different from the moving direction of the person who creates the magnetic field map at the collection time, the sampled magnetic vector may have different values from the vector values recorded in the field map. This may substantially lower the positioning accuracy. To avoid this problem, the existing studies use only the magnitude of magnetic vector, but this reduces the uniqueness of the fingerprint, which may also degrade the positioning accuracy. In this paper we propose a vector calibration algorithm which can adjust the sampled magnetic vector values to the vector direction of the magnetic field map by using the parametric equation of a circle. This can minimize the inaccuracy caused by the direction mismatch. 지자기 벡터는 센서가 바라보고 있는 방향에 따라 그 값이 달라지는 특성이 있다. 본 논문에서는 그런 문제를 최소화하여 지자기 기반 실내 위치 추정에 사용될 수 있도록 지자기 벡터 보정법을 제안한다. 지자기 기반 실내 위치 추정에서 사용되는 핑거프린팅 기법은 자기장 지도와 현재 위치에서의 자기장 값을 매칭하여 위치를 추정해낸다. 이 때, 자기장 센서는 사용자의 이동 방향에 따라 읽어 들이는 자기장 벡터 값이 달라지기 때문에 위치 추정 정확도가 낮아진다. 이를 해결하기 위해 많은 연구들은 자기장 벡터 크기를 사용하지만, 이는 지문의 고유성을 감소시킨다. 따라서 본 논문에서는 지문의 고유성을 유지할 수 있는 자기장 벡터를 그대로 사용하되, 벡터 크기처럼 사용자의 이동방향에 영향을 받지 않도록 벡터 값을 보정하는 방법을 제안한다. 임의의 방향으로 걸어본 결과, 본 연구에서 제안된 보정법을 사용하면 자기장 지도와의 매칭 정확도가 높아지는 것을 확인하였다.

Change in Expression of Survivin Caused by Using Oxaliplatin in HCT116 Colon Cancer Cells

손원준,이정원,박동국 대한대장항문학회 2010 Annals of Coloproctolgy Vol.26 No.4

Purpose: Oxaliplatin is a third-generation platinum compound, and it has no nephrotoxicity and has reduced bone marrow toxicity. Cancer cells that are resistant to cisplatin are sensitive to oxaliplatin. Oxaliplatin is used widely for the treatment of colon cancers. Recently, oxaliplatin was reported to inhibit the expression of survivin, which protects cell apoptosis. However, there are no reports on the expressions of survivin variants and the changes in intracellular localization of survivin in cancer cells. We studied the expression of survivin caused by oxaliplatin in HCT116 colon cancer cells, and we observed the localization of survivin in the mitotic phase. Methods: We treated the HCT116 colon cancer cells with 2.0 μM of oxaliplatin, and we studied the expressions of survivin protein, and survivin mRNA variants, as well as the changes in intracellular localization, by using the Western blot method,RT-PCR, immunocytochemistry, and flowcytometry. Results: Oxaliplatin inhibits the expression of the survivin protein and survivin mRNA in HCT116 colon cancer cells. The expression of the survivin-2B variants, which have no antiapoptotic activity but control cell mitosis by localization on a microtubule, is reduced continuously 2 days after treatment with oxaliplatin. In immunocytochemistry, expression of survivin in the cytoplasm is reduced and especially is not expressed in microtubules and contractile rings. Conclusion: One of the mechanisms of oxaliplatin is to inhibit the expression of and to change the localization of survivin. Based on these results, we suggest that changes in the expression of survivin variants and in their localization are two effects of oxaliplatin.

A retrospective study of the intentionally replanted mandibular second molars with C-shaped root canal configurations

손원준,금기연,백승호,이우철 大韓齒科保存學會 2011 Restorative Dentistry & Endodontics Vol.36 No.1

Objectives: The purpose of this retrospective study was to evaluate the success rate of intentionally replanted mandibular second molar with C-shaped canal configurations and to access the impact of preoperative periapical lesion on the success of intentional replantation procedure. Materials and Methods: This retrospective chart review study evaluated 52 intentionally replanted mandibular second molar teeth treated at Seoul National University Dental Hospital Department of Conservative Dentistry from January 2005 to December 2007. Seventeen teeth were lost for the follow-up, and another 6 teeth did not meet inclusion criteria of C-shaped root canal configurations. Healing outcome such as success, uncertain healing, and failure after follow-up was evaluated by clinical criteria and radiographs. Results: The overall success rate was 72.4% for the 29 intentionally replanted C-shaped mandibular second molars. The success rate of replanted teeth with preoperative periapical lesions was similar to that of replanted teeth which have no periapical lesions. Conclusions: Therefore, root canal treatment failure on C-shaped mandibular second molar can be predictably treated by intentional replantation regardless of the presence of periapical lesion. [J Kor Acad Cons Dent 2011;36(1):19-25.] 연구목적: 인류지질학적으로 동양인에게서 많이 발견되는 C-형 근관계를 가진 하악 제2대구치는 근관치료나 비외과적 재 치료에 실패하는 경우 외과적 재치료 방법으로 의도적 재식술을 시행하게 되는데 그 성공률에 대한 보고가 없었다. 따라서 본 연구의 목적은 C-형 근관계를 가진 하악 제2대구치에 의도적 재식술을 시행한 환자의 기록을 후향적으로 조사하여 치 료 결과에 따른 성공률을 확인할 뿐 아니라 치료전 존재하던 치근단 병소가 성공률에 영향을 미치는 바에 대하여 알아보는 것이다. 연구 재료 및 방법: 연구를 위해 2005년 1월부터 2007년 12월에 걸쳐 서울대학교치과병원 치과보존과에 내원하여 하악 제 2대구치에 의도적 재식술을 받은 52명의 환자 기록을 조사하였으며 7개의 치아는 정기적인 내원검진 기록이 없어서 조사 대 상에서 제외하였고 다른 6개의 치아는 C-형 근관계의 조건에 해당되지 않아 연구에서 제외하였다. 정기 내원후 시행한 임상 검사와 방사선 사진 기록을 후향적으로 검토하여 성공이나 불완전한 치유 또는 실패등의 치료 결과에 대하여 판단하였다. 결과: C-형 근관계를 가진 29개의 하악 제2대구치에 시행한 의도적 재식술의 성공률은 72.4%로 관찰되었으며 치료전 치근 단 병소가 존재한 경우의 성공률은 치근단 병소가 없었던 경우와 유사한 것으로 확인되었다. 결론: 본 연구결과 C-형 근관계를 가진 하악 제2대구치의 근관치료가 실패한 경우 시행하게 되는 의도적 재식술은 술전 병소 의 존재 유무에 상관없이 치근단 수술의 성공률과 유사한 결과를 얻을 수 있는 치료라고 사료된다.

실내 위치추정 성능 향상을 위한 지자기 센서 보정법

손원준(Wonjoon Son),최린(Lynn Choi) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1

감정연출 효과를 고려한 무형문화의 VR Digital Archive시스템연구

손원준 ( Son Wonjun ) 한국디자인트렌드학회 2014 한국디자인포럼 Vol.45 No.-

본 연구에서는 탈춤과 같은 무형문화재의 Digital Archive에 있어서 외면적 표현에 대한 정확한 기록은 물론, 감정표현과 같은 내면적 표현에 대한 요소들을 파악하고 이를 고려하여 감성디자인과 연계한 Digital Archive 방법에 대하여 연구하였다. 더 나아가 분석된 감정표현의 요소와 감정평가의 결과들을 바탕으로 감정표현에 대한 조절과 의도된 연출이 가능한 새롭고 독창적인 Digital Archive시스템을 구축하는 것이 연구목적이었다. [하회탈]과 [능면]에 대한 감정의 특징을 조사하기 위해서, 가면을 3D CG로 디지털화한 후, 컴퓨터상에서 대상물의 방향이라고 하는 요소를 각각의 다른 각도로부터 단계적으로 선정하여, 가면의 감성적 특성을 조사했다. 다음으로, 감정평가의 결과로부터 추출한 인자를 이용하여, 감정평가인자에 근거한 감정조절축을 가정했다. 그리고 prototype으로서 감정효과를 고려한 가면의 VR Digital Archive 시스템을 제작해 그 효과에 대해서 검토했다. 이상의 연구를 통해서 감정평가라고 하는 새로운 관점을 더한 미디어테크놀로지의 성과를 기반으로 독자성 있는 시스템의 실현 가능성을 제안할 수 있었다. This study purposed to identify the elements of internal expressions such as emotional expressions to be considered in the Digital Archives of intangible cultural assets like mask dances, and to find Digital Archive methods that reflect such elements and are connected to emotion design. Based on the analyzed elements of emotional expressions and the results of emotional evaluation, furthermore, this study aimed to build a new and original Digital Archive system that can control emotional expressions and implement intended emotional expressions. To investigate the characteristics of viewers` emotion toward [Hahoe Mask] and [Noh Mask]. we digitalized the masks in 3D CG, chose different aspects of the masks on the computer by stage using `the direction of the object` and examined the emotional characteristics of the masks. Then, using factors extracted from the results of emotion evaluation, we formulated an emotion evaluation axis. In addition, we created the prototype of a virtual presentation system in consideration of the emotion effect, and examined its effects. Through this study as presented above, we proposed the possibility of the original system based on progress in media technology that has added a new viewpoint of emotion evaluation.

빛의 효과에 따른 감성변화와 디지털이미지 표현 연구

손원준(Son Won Jun),김철기(Kim Cheol Ki) 한국디지털디자인학회 2007 디지털디자인학연구 Vol.7 No.4

본 연구에서는 인간의 감성에 영향을 줄 수 있는 다양한 시각적 표현방법 중 빛의 조건에 의하여 달라지는 대상물에 대한 관람자의 시각적인 감성에 주목하고 대상물에 대한 빛의 조건을 변화시켜 대상물과 대상물을 관람하는 관람자간에 변화하는 시각적인 감성을 평가하였다. 조사대상으로 선정한 대상물은 가면으로 정하여 가면에 대한 빛의 조건에 따른 시각적 특성과 감성과의 상관성에 관하여 분석하였다. 그리고 가설로서 감성조절축을 구축하였다. 이를 바탕으로 관람자의 감성을 기초로 한 빛의 조건 조절방법을 이용하여 새로운 디지털이 미지 표현 방법에 대하여 제안하였다. 연구방법으로 하회탈을 3DCG로 디지털화 한 후 컴퓨터상에서 조명의 방향이라는 인자를 이용하여 가면의 감성적 특성을 조사하였다. 또 가면의 감성평가를 계측하기위해 대표적 기법인 SD법(Semantic Differential Method)을 이용하였다. 다음으로 감성평가 결과로부터 얻어진 인자를 바탕으로 감성평가인자를 기초로 한 감성조절축을 가정하고 빛의 조건 조절방법을 이용한 디지털이미지 표현 방법에 대하여 검토하였다. The present study taking note of the fact that viewers' emotion is invoked differently depending on presentation method examined viewers' emotion while changing the condition of exhibition. In addition the relation between lighting condition and emotion was analyzed and expression method of digital image was proposed by explaining a presentation method targeting axis as a hypothesis. As to research method the effects of presentation methods on viewers' emotion were examined. This study chose masks as display objects particularly 'Hahoe Mask' from Korea. To investigate the characteristics of viewers' emotion toward the masks we digitalized the masks in 3DCG chose different aspects of the masks on the computer by stage using factor 'the direction of light,' and examined the emotional characteristics of the masks. Then using factors extracted from the results of emotion evaluation we formulated an emotion evaluation axis. And we discussed the creation expression method of digital image including the emotion evaluation factors. Also we assumed an emotion manipulation axis based on 'the factors affecting presentation' and 'the emotion evaluation factors' extracted in the research respectively and based on the axis we developed expression system of digital image in consideration of viewers' emotion. The system was tried by viewers their opinions were collected and problems in the system were identified.

치수 및 치근단병소에서 Prostaglandin E₂, 6-keto-prostaglandin F₁α, Leukotriene B₄의 분포에 관한 연구

임성삼,백승호,손원준 大韓齒科保存學會 2000 Restorative Dentistry & Endodontics Vol.25 No.2

총담관 결석 환자의 복강경 총담관 결석 제거술 성적

손종일,최인석,이상억,나유미,최원준,윤대성,민현식 대한내시경복강경외과학회 2010 Journal of Minimally Invasive Surgery Vol.13 No.2

Purpose: ERCP (Endoscopic retrograde cholangiopancreatigraphy)and ES (endoscopic sphicterotomy) have become the main treatments for common bile duct (CBD) stone. However, when ERCP with ES fails to remove CBD stone, an operation is needed for stone removal. The aim of this study was to investigate the outcomes of laparoscopic CBD exploration (LCBDE) for the management of difficult choledocholothoasis. Methods: This study was a retrospective analysis of 106LCBDE cases that were performed from March 2001 to December, 2009. Results: Of the 106 patients who underwent laparoscopic procedures, 74 were combined with gallstone and 105underwent the choledochotomy approach. The mean operation time and mean hospital stay were 146.9±74.5minutes and 11.0±6.4 days, respectively. The open conversion and stone clearance rates were 3.8% (4 cases) and 96%(102/106 cases). There were 10 complications with 3 cases of bile leakage, 2 cases of pulmonary complications, 4 cases of remnant stone and 1 case of subhepatic seroma. Conclusion: The LCBDE is a safe and feasible procedure. If ERCP is difficult or stone retrieval is incomplete, then LCBDE could be an alternative treatment for difficult CBD stone.

황해의 해양과학기지와 백령도 시정자료를 이용한 해무 강도별 빈도 분석

손경미,양찬수,신대운,최원준,민인기 (사)한국연안방재학회 2023 한국연안방재학회지 Vol.10 No.4

While existing research on sea fog primarily relied on collecting data from ground observations in coastal areas, this study utilized municipal data from three Korea Ocean Research Stations (KORS) located in the Yellow Sea and Baengnyeongdo. The main objective was to analyze the strength of sea fog in specific locations within the Yellow Sea. The study employed the corrective distance as a measure of intensity and examined variations in sea fog strength according to the monthly and by time period of the study area. The research periods for each research station were as follows: Socheongcho Ocean Research Stations (SORS) from 2014 to 2022, Gageocho Ocean Research Stations (GORS) from 2014 to 2020, Ieodo Ocean Research Stations (IORS) from 2010 to 2015, and Baengnyeongdo from 2016 to 2022. In terms of season, the highest sea fog frequency in SORS and GORS were at 59% and 75% in spring, respectively. While in IORS, sea fog intensively occurred throughout the spring (46%) and summer (47%) seasons. On the other hand, in Baengnyeongdo, the sea fog frequency in summer, spring, autumn and winter were 41%, 25%, 17% and 17%, respectively. Between September and February the occurrence frequency was 19%, 8.1% and 7.3% in SORS, GORS and IORS, respectively which tends to decrease as it descends South of the Yellow Sea. In SORS, sea fog frequency with 0.2 km (strength 2) visibility was 49% while in the case of GORS and IORS it was 15% and 22%, respectively. Besides, the frequency of sea fog which visibility was between 0.2 and 0.5 km (strength 1) was 59% and 56% in GORS and IORS, respectively. In terms of frequency by time period, SORS and GORS showed a normalization maximum of 01 at 01:00 KST where IORS showed 02. Sea fog was not seen at 12:00 in SORS, at 13-17:00 in GORS and at 19-20:00 in IORS. In the future, we will analyze the spatial distribution of sea fog occurring in the Yellow Sea after sea fog verification using satellite images.