WLAN 기반 실내 위치 측위에서 측위 정확도 향상을 위한 데이터 구축 방법

송진우,허수정,박용완,유국열,Song, Jin-Woo,Hur, Soo-Jung,Park, Yong-Wan,Yoo, Kook-Yeol 대한임베디드공학회 2012 대한임베디드공학회논문지 Vol.7 No.2

In this paper, we proposed Wireless LAN (WLAN) localization method that enhances database construction based on weighting factor and analyse the characteristic of the WLAN received signals. The weighting factor plays a key role as it determines the importance of Received Signal Strength Indication (RSSI) value from number of received signals (frequency). The fingerprint method is the most widely used method in WLAN-based positioning methods because it has high location accuracy compare to other indoor positioning methods. The fingerprint method has different location accuracies which depend on training phase and positioning phase. In training phase, intensity of RSSI is measured under the various. Conventional systems adapt average of RSSI samples in a database construction, which is not quite accurate due to variety of RSSI samples. In this paper, we analyse WLAN RSSI characteristic from anechoic chamber test, and analyze the causes of various distributions of RSSI and its influence on location accuracy in indoor environments. In addition, we proposed enhanced weighting factor algorithm for accurate database construction and compare location accuracy of proposed algorithm with conventional algorithm by computer simulations and tests.

동물성 첨가제가 모르타르 및 콘크리트의 기초 물성에 미치는 영향

송진우,문승권,Song, Jin-Woo,Moon, Seung-Kwon 한국건설순환자원학회 2012 한국건설순환자원학회지 Vol.7 No.1

본 연구는 모르타르와 콘크리트에 첨가제로서, 돈혈을 혼합하였을 때 물성에 미치는 영향을 알아보기 위해 실험을 실시하였다. 모르타르 실험에는 단위질량, 플로우, 압축강도 실험을 실시하였고, 콘크리트 실험에는 공기량, 슬럼프, 블리딩, 응결시간, 압축강도, 동결융해저항성 실험을 실시하였다. 실험 결과로서, 돈혈을 모르타르와 콘크리트에 첨가하면 공기연행효과를 가지는 것으로 나타났다. 모르타르 실험에서는 플로우 값은 증가하며, 단위중량은 감소하고, 압축강도는 공기연행에 의해 감소하였다. 콘크리트 실험에서는 돈혈을 첨가하였을 때 공기연행효과로 공기량은 증가하나, 시간이 경과함에 따라 공기량이 감소하는 경향이 있으며, 응결시간이 지연되고, 블리딩량은 감소하는 경향을 보이는 것으로 나타났다. 콘크리트의 압축강도는 공기연행작용으로 인하여 강도가 감소하며, 동결융해 저항성은 향상되는 효과가 있는 것으로 나타났다. The study was conducted to determine the effects of adding pig blood as an admixture to both mortar and concrete. The mortar tests included the determination of its unit weight, flow and its compressive strength. Moreover, the concrete test includes the determination of air content, slump, bleeding, setting time compressive strength and freeze-thaw resistance of the material. As the test result, the utilization of pig blood, as an additive to both mortar and concrete mixtures causes air entrainment. The mortar flow increased and both the unit weight and the compressive strength of mortar decreased. As the blood replacement rate increases, the air content decreases over time, the setting and amount of bleeding showed a tendency to decline and reduced compressive strength, and the freeze-thaw resistance of the concrete increased.

Synthesis of Fluorescent Thiophene-derivatized Pentytiptycenes and Their Aggregate Behaviors

송진우,Song, Jinwoo The Basic Science Institute Chosun University 2010 조선자연과학논문집 Vol.3 No.1

Thiophene-derivatized pentiptycenes were synthesized and characterized by NMR and UV-Vis spectroscopy. Aggregation behavior of thiophene-derivatized pentiptycenes was monitored by the measurement of fluorescence. Fluorescence intensities for the thiophene-derivatized pentiptycenes and thiophene-derivatized pentiptycenes aggregates were compared. There is no shift in the maximum of the emission wavelength. In the range of water fraction between 20% and 40%, the emission intensity of thiophene-derivatized pentiptycene aggregates remains almost identical. Fluorescence efficiency incresaed by about 5 times higher when the thiophene-derivatized pentiptycenes forms the aggregates in solution.

소셜 미디어 사용자의 최근 관심사를 고려한 소셜 검색 기법

송진우(JinWoo Song),전현욱(Hyeonwook Jeon),김민수(Minsoo Kim),김기훈(Gihoon Kim),노연우(Yeonwoo Noh),임종태(Jongtae Lim),복경수(Kyoungsoo Bok),유재수(Jaesoo Yoo) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.2

기존의 소셜 검색은 사용자의 프로파일의 최신성과 유사한 사용자의 관심사를 고려하지 않기 때문에 검색 결과가 사용자에게 적합하지 않다는 문제가 있다. 이에 따라 시간적 속성과 다른 사용자의 관심사를 고려한 소셜 검색 연구가 요구되고 있다. 본 논문에서는 시간에 따른 최근 관심사, 사용자와 유사도가 높은 사용자들의 관심사를 고려한 소셜 검색 기법을 제안한다. 제안하는 기법은 사용자의 최근 관심사를 고려하기 위해 소셜 미디어 사용자의 활동 정보를 분석한다. 다른 사용자들의 관심사를 분석한 정보와 결합하여 랭킹을 수행함으로써 검색 결과의 만족도와 정확성을 향상시킨다. 성능평가를 통해 제안하는 소셜 검색 기법이 기존 기법에 비해 성능이 우수함을 보인다. The existing social search has a problem that search results are not suitable for a user since it does not take into account the recency of the user profile and the interests of similar users. Therefore, studies on a social search considering a temporal attribute and the interests of other users are required. In this paper, we propose a social search scheme that takes into account the recent interests of a user by time and the interests of the most similar users. The proposed scheme analyzes the activity information of a social media user in order to take into account the recent interests of the user. And then the proposed scheme improves the satisfaction and accuracy of search results by combining the interests of similar users with the analyzed information and performing ranking, It is shown through performance evaluation that the proposed scheme outperforms the existing scheme.

소셜 미디어에서 사용자 관심을 고려한 개인화 검색 기법

송진우(JinWoo Song),전현욱(Hyeonwook Jeon),김민수(Minsoo Kim),최도진(DoJin Choi),임종태(Jongtae Lim),복경수(Kyoungsoo Bok),유재수(Jaesoo Yoo) 한국정보과학회 2016 한국정보과학회 학술발표논문집 Vol.2016 No.6

마이크로자이로를 이용한 3자유도 HMD 입력장치 개발

송진우(Song Jin Woo),정학영(Chung Hakyoung),박찬국(Park Chan Gook),이장규(Lee Jang Gyu),강태삼,박규철(Park Kyucheol) 제어로봇시스템학회 2001 제어로봇시스템학회 국제학술대회 논문집 Vol.2001 No.10

소아 환자에서 유리피판술을 이용한 연부 조직 결손의 재건

송진우 ( Jin Woo Song ),홍준표 ( Joon Pio Hong ) 대한외상학회 2010 大韓外傷學會誌 Vol.23 No.2

Purpose: Free flap reconstruction in the pediatric population is difficult. However, microsurgery has had remarkable success rates in children. The aim of study is to present our clinical experience using free flap for reconstruction of soft tissue defects in children and to describe long-term follow-up results. Methods: Between June 2002 and July 2010, 30 cases of pediatric reconstruction were performed with free flap. The authors analyzed several items, such as the kind of flap, associated complications, and growth problems. Results: Among the 30 cases, 21 cases were due to traffic accidents, 5 to cancer, and 4 to falls and other soft tissue defects. The lower leg and foot were the most common sites of the lesion. In the free flap operations we have done, 20 cases involved an anterolateral thigh perforator free flap, 6 a superficial circumflex iliac perforator free flap, and 4 an upper medial thigh perforator free flap. In early postoperative complications, partial necrosis was seen in 2 cases, infection in 1 case, and the hematoma in 1 case. A satisfactory success rate and functional results were achieved. Conclusion: Free flap reconstruction in children allows satisfactory function with no significant effect on growth. Free flaps are regarded as the primary choice for selective pediatric reconstructive cases. (J Korean Soc Traumatol 2010;23:157-162).

호산구성 췌장염

송진우 ( Song Jin U ),김명환 ( Kim Myeong Hwan ),서욱장 ( Seo Ug Jang ),오동렬 ( O Dong Lyeol ),김기덕 ( Kim Gi Deog ),문성훈 ( Mun Seong Hun ),양동훈 ( Yang Dong Hun ),송문희 ( Song Mun Hui ),이상수 ( Lee Sang Su ),서동완 ( Seo D 대한소화기학회 2003 대한소화기학회지 Vol.42 No.5

Eosinophilic pancreatitis is a rare disorder that may only be diagnosed after pancreatic resection under the suspection of a pancreatic tumor. We experienced a 65-year-old female patient whose initial presentation suggested pancreatic cancer. Radiologic evaluation revealed a pancreatic mass-like lesion which was obstructing the main pancreatic duct. Endoscopic retrograde cholangiopancreatography (ERCP) showed double duct strictures involving the distal common bile duct and the main pancreatic duct. Serum IgE level was elevated. Percutaneous core needle biopsy with an 18-gauge needle was performed targeting the pancreatic lesion. The biopsy specimen revealed fibrotic interlobular septum and intralobular fibrosis with prominent eosinophilic infiltration. The patient was treated with oral prednisolone (40 mg/day). A plastic stent was inserted into the narrowed common bile duct. After three months of oral steroid therapy, symptoms and signs improved rapidly and serum IgE level was decreased. Abdominal computed tomography and ERCP revealed remission of pancreatic mass-like lesion. (Korean J Gastroenterol 2003;42:444-449)

마인드 맵을 이용한 이야기나누기가 지체장애학생의 쓰기능력에 미치는 효과

송진우 ( Jin Woo Song ),이효근 ( Hyo Keun Lee ),이미경 ( Mi Kyung Lee ) 한국특수아동학회 2013 특수아동교육연구 Vol.15 No.2

이 연구에서는 전라남도 장애인종합복지관에서 조기교육 서비스에 참가하고 있는 지체장애학생 3명을 대상으로 마인드 맵을 이용한 이야기나누기가 이들의 쓰기능력에 어떠한 효과를 가져 오는 가를 알아보았다. 연구 결과, 첫째, 마인드 맵 활동을 이용한 이야기 나누기는 지체장애 학생의 쓰기에 있어 단문과 복문의 수가 증가하여 문장구성에 긍정적인 영향을 주었다.둘째,마인드 맵을 이용한 이야기나누기는 대상자의 문장길이의 증진에도 긍정적인 효과를 가져왔다. 이상의 결과들을 통해 마인드 맵을 이용한 이야기 나누기를 하는 동안 주제 개념 정리 및 경험, 생각, 느낌 나누기 등의 언어적 상호작용은 뇌성마비 학생의 쓰기 능력에서 긍정적인 효과를 가져왔다는 것을 알 수 있었다. 따라서 국어교과 지도 시 마인드맵을 이용한 쓰기지도를 지속적으로 실시한다면 지체장애 학생의 쓰기능력에서 많은 향상을 가져올 것이라 기대된다. This study explored the effects of story sharing by using the mind map on writing ability of students with physical disabilities. For this purpose, this study applied the multiple baseline targeting for 3 middle school students with physical disabilities who attend the early education program of a community welfare center for disabled people in Jeollanam-do. The results of study were as follows. First, sharing stories by using the mind map had a positive effect on the construction of sentences in writing of physically challenged students. As the numbers of simple sentences and complex sentences of participants in the writing were increased, the scores of construction of sentences were increased. Second, the story sharing by using the mind map had a positive effect on the length of sentences of students with physical disabilities. We could expect that summary of themes, sharing experiences and feeling through language interaction during activities of mind map brought positive effects on writing abilities for students with middle school students with physical disabilities. If the writing instruction by using mind map during language arts class was taught consistently, it would bring much improvement on writing skills for students with physical disabilities.

조합 경매에서의 최적 분배를 위한 빠른 알고리즘

송진우(Jin-Woo Song),양성봉(Sung-Bong Yang) 한국정보과학회 2003 정보과학회논문지 : 시스템 및 이론 Vol.30 No.9·10

In combinatorial auctions buyers may bid for arbitrary combinations of goods. But determining the winners of combinatorial auctions who maximize the profit of a seller is known to be NP-complete. A branch-and-bound method can be one of practical algorithm for winner determination. However, bid selection heuristics play a very important role in the efficiency of a branch-and-bound method. In this paper, we designed and implemented an algorithm which used a branch-and-bound method and Linear Programming for winner determination in combinatorial auctions. We propose new bid selection heuristics which consider a branching bid and conflicting bids simultaneously to select a branching bid in the algorithm. In addition, upper bounds are reused to reduce the running time in specific cases. We evaluated the performance of the algorithm by experiments with five data distributions and compared our method with others. The algorithm using heuristics showed a superior efficiency in two data distributions and a similar efficiency in three distributions. 조합 경매에서는 구매자들이 원하는 상품들을 조합해서 입찰할 수 있다. 그러나 판매자의 이익을 최대로 하는 구매자들, 즉 조합 경매의 승자를 결정하는 문제는 NP-complete이다. 적절한 시간 내에 승자를 찾기 위해서 분기 한정법(branch-and-bound)을 사용할 때, 구매자들의 비드(bid)들 중에서 어떤 비드를 선택해서 분기할 것인가를 결정해야 한다. 이 때, 비드를 선택하는 휴리스틱이 분기 한정법의 성능을 결정하는 중요한 역할을 한다. 본 논문에서는 조합경매의 승자를 결정하기 위해서 분기 한정법과 Linear Programming(LP)를 사용하는 알고리즘을 설계하고, 분기할 비드를 선택하기 위하여 분기할 비드와 충돌하는 비드들을 동시에 고려하는 비드 선택 휴리스틱을 제안한다. 그리고 최대 한계치를 재사용하는 경우를 찾아내서 알고리즘의 수행 시간을 줄였다. 알고리즘의 수행 성능을 평가하기 위해서 다섯 가지의 데이타 분포에 대한 실험 결과를 이전 논문들과 비교했다. 제시한 휴리스틱을 사용한 알고리즘은 두 가지 데이타 분포에서는 더 빠른 성능을 보였고 나머지 세 분포에서는 비슷한 성능을 보였다.