소셜 빅데이터를 활용한 도시공원 인식 비교 분석 연구: 양재시민의숲과 서서울호수공원을 대상으로

박상훈(Park, Sang-Hun),안영아(An, Young-A) 한국도시행정학회 2021 도시 행정 학보 Vol.34 No.4

이 연구는 온라인에서 발생하는 소셜 빅데이터 분석을 위해 유사한 주거지역에 위치한 두 개의 공원을 사례 대상으로 선정하여 비교분석 하였다. 이를 위해 도시공원에 대한 인식을 분석하고 개별공원의 특성과 이용상의 차이를 확인하는 방법으로써 소셜 네트워크 분석의 적용 가능성을 확인하고자 한다. 분석은 빅데이터를 근거로 하며, 연구의 핵심이 키워드 분석임에 따라 저자가 특허 등록한 ‘감성정보 분석 방법’의 일부를 활용하였다. 분석결과, 양재시민의 숲과 서서울호수공원은 계절을 체험하고, 느낄 수 있는 산책 공간으로 이용하고 있는 것으로 판단된다. 서서울호수공원은 주로 가족 단위로 공원의 시설과 공원 콘텐츠를 이용하는 반면에 양재시민의 숲은 가족 뿐만 아니라 친구 등 이용대상이 상대적으로 폭넓고 공원 시설 외에 양재천, 둘레길, 맛집 등 주변 환경과 연계된 이용 양상을 보이는 것으로 해석된다. 이러한 연구 결과는 도시공원 운영 및 관리에 있어 공원 이용객의 특성, 이용시간 등을 고려하여 프로그램을 개발하고 운영할 필요가 있음을 시사한다. In this study, two parks located in similar residential areas were selected as case subjects for the analysis of social big data analysis occurring online. For this purpose, the applicability of social network analysis is to be checked as a method of analyzing the perception of urban parks and identifying differences in characteristics and use of individual parks. The analysis is based on big data, and as the core of the study is keyword analysis, a part of the ‘emotional information analysis method’ registered by the author in the patent was used. As a result of the analysis, it is judged that Yangjae Citizen"s Forest and West Seoul Lake Park are being used as walking spaces where you can experience and feel the seasons. West Seoul Lake Park mainly uses the park"s facilities and park contents on a family basis. On the other hand, Yangjae Citizen"s Forest is interpreted as showing a relatively wide range of use for not only family but also friends, and it is used in connection with the surrounding environment such as Yangjaecheon Stream, Dullegil, and restaurants in addition to park facilities. These research results suggest that it is necessary to develop and operate programs in consideration of the characteristics and hours of use of park users in the operation and management of urban parks.

TCD를 이용한 두개강내 동맥류의 예후 예측 가능한 New Scale(NS) Score System

박상훈,박종운,박현선,현동근,하영수,Park, Sang Hoon,Park, Chong Oon,Park, Hyeon Seon,Hyun, Dong Keun,Ha, Young Soo 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.8

Objective : By conducing a review of clinical outcomes for patients with aneurysm treated using current microneurosurgical techniques and intensive care unit management, we speculated that grading systems based only on clinical condition or CT finding after admission failed to provide a significant stratification of outcome between individual grades of patients, because these systems did not include the factor for postoperative vasospasm. We hypothesized that postoperative blood flow velocity could have a significant impact on outcome prediction for patients surgically treated for intracranial aneurysms. Methods : We conducted a analysis on patient- and lesion-specific factors that might have been associated with outcome in a series of 55 aneurysm operations performed with measurements of blood-flow velocity with transcranial Doppler ultrasonography(TCD). In the new scale(NS) score system, 1 point is assigned additionally for the case with Hunt and Hess(H-H)/World Federation of Neurological Surgeons(WFNS) Grade IV or V, Fisher Scale(FS) score 3 or 4, aneurysm size greater than 10mm, patient age older than 60 years, blood-flow velocity higher than 120cm/sec, and posterior circulation lesion. By adding the total points, a 6-point scale score(score 0-6) is obtained. Results : Age of patient, size of aneurysm, clinical condition(H-H grade and WFNS), FS score, and blood flow velocity(TCD 1day after operation) were independently and strongly associated with long-term outcome. When NS scores were applied to 55 patients with at least 6 months follow-up, the correlation of individual scores with outcome was strongly validated the retrospective findings. Conclusion : It was speculated that TCD could be used to assess postoperative vasospasm and to monitor noninvasively the patients with aneurysmal SAH. This NS score system is easy to apply, divide patients into groups with different outcome, and is comprehensive, allowing for more accurate prediction of surgical outcome.

펠티어 냉난방시스템 최적화 기술에 관한 연구

박상훈,정수진,박영우,박유경,송범중,Park, Sanghoon,Jeong, Soojin,Park, Youngwoo,Park, Ukyung,Song, Beomjung 한국교통대학교 융복합기술연구소 2013 융ㆍ복합기술연구소 논문집 Vol.3 No.1

This study is concerned with air-conditioning system in use of thermoelectric device. It is introduced that the well designed structures for better cooling & heating performance with high efficiency. And also it is performed that the system performance test of four types trial products for the use of hybrid commercial vehicle. System performance is affected by many component parts, especially heat sink design & power control method. It is applied that dual extrusive fin tube with buffer zone for the effective radiating of circulating liquid in tube. And also it is applied that power supply method with constant-current system. It is attained that system cooling capacity is 1.2kW, COP is 0.95.

구조물의 토폴로지 최적화에 관한 연구

박상훈,윤성기,Park, Sang-Hun,Yun, Seong-Gi 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8

The problem of structural topology optimization can be relaxed and converted into the optimal density distribution problem. The optimal density distribution must be post-processed to get the real shape of the structure. The extracted shape can then be used for the next process, which is usually shape optmization based on the boundary movement method. In the practical point of view, it is very important to get the optimal density distribution from which the corresponding shape can easily be extracted. Among many other factors, the presence of checker-board patterns is a powerful barrier for the shape extraction job. The nature of checker-board patterns seems to be a numerical locking. In this paper, an efficient algorithm is presented to suppress the checker-board patterns. At each iteration, density is re-distributed after it is updated according to the optimization rule. The algorithm also results in the optimal density distribution whose corresponding shape has smooth boundary. Some examples are presented to show the performance of the density re-distribution algorithm. Checker-board patterns are successfully suppressed and the resulting shapes are considered very satisfactory.

신경망을 이용한 반도체 공정 시뮬레이터 : 포토공정 오버레이 사례연구

박상훈,서상혁,김지현,김성식,Park Sanghoon,Seo Sanghyok,Kim Jihyun,Kim Sung-Shick 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.4

The advancement in semiconductor technology is leading toward smaller critical dimension designs and larger wafer manufactures. Due to such phenomena, semiconductor industry is in need of an accurate control of the process. Photolithography is one of the key processes where the pattern of each layer is formed. In this process, precise superposition of the current layer to the previous layer is critical. Therefore overlay parameters of the semiconductor photolithography process is targeted for this research. The complex relationship among the input parameters and the output metrologies is difficult to understand and harder yet to model. Because of the superiority in modeling multi-nonlinear relationships, neural networks is used for the simulator modeling. For training the neural networks, conjugate gradient method is employed. An experiment is performed to evaluate the performance among the proposed neural network simulator, stepwise regression model, and the currently practiced prediction model from the test site.

프레임 기반의 우선순위화를 적용한 네트워크 적응형 HD MPEG-2 스트리밍의 설계 및 구현

박상훈,이승주,김종원,김우석,Park SangHoon,Lee Sensjoo,Kim JongWon,Kim WooSuk 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.10A

최근 네트워크 미디어 기술의 발달로 인터넷 망에서 HDTV급의 고화질 비디오를 스트리밍하는 시도가 많이 이루어 지고 있다. 그러나 최선형 서비스(best-effort service)를 기반으로 하는 인터넷 망에서 고화질 비디오를 안정적으로 스트리밍하기 위해서는 네트워크 상황에 적응할 수 있는 전송 기법이 요구된다. 본 논문에서는 MPEG 프레임(I, P, B)기반의 패킷 우선순위화를 적용한 네트워크 적응형 HD MPEG-2 스트리밍 시스템을 설계 및 구현한다. 전송 비디오는 JVC HDV 카메라로부터 실시간으로 입력받으며 19.2 Mbps의 비트율과 MPEG-2 TS (MPEG-2 MP@HL) 형식을 갖는다. 네트워크 상태의 측정은 스트리밍 클라이언트에서의 RTP 패킷 헤더의 파싱을 이용한 패킷 손실율과 평균 지터의 측정을 통해 이루어지며 이 정보는 주기적으로 스트리밍 서버로 피드백 된다. 스트리밍 서버의 네트워크 적응 관리자(network adaptation manager)에서는 네트워크 상태에 따라 프레임의 중요도에 따른 프레임 폐기(frame dropping)를 함으로서 전송률 적응을 수행한다. 이와 관련하여 TS 패킷의 실시간 파싱 및 프레임 기반 패킷 우선순위화 기법이 제안된다. 제안 시스템은 소프트웨어로 구현되며 LAN 환경에서의 실험을 통해 네트워크의 이용 가능한 대역폭이 변동하는 상황에서 HD 스트리밍의 종단 간 서비스 품질을 향상시킴을 보여준다. As the networked media technology have been grown in recent, there have been many research works to deliver high-quality video such as HDV and HDTV over the Internet. To realize high-quality media service over the Internet, however, the network adaptive streaming scheme is required to adopt to the dynamic fluctuation of underlying networks. In this paper, we design and implement the network-adaptive HD(high definition) MPEG-2 streaming system employing the frame-based prioritized packetization. Delivered video is inputted from the JVC HDV camera to the streaming sewer in real-time. It has a bit-rate of 19.2 Mbps and is multiplexed to the MPEG-2 TS (MPEG-2 MP@HL). For the monitoring of network status, the packet loss rate and the average jitter are measured by using parsing of RTP packet header in the streaming client and they are sent to the streaming server periodically The network adaptation manager in the streaming server estimates the current network status from feedback packets and adaptively adjusts the sending rate by frame dropping. For this, we propose the real-time parsing and the frame-based prioritized packetization of the TS packet. The proposed system is implemented in software and evaluated over the LAN testbed. The experimental results show that the proposed system can enhance the end-to-end QoS of HD video streaming over the best-effort network.

공동주택의 유지관리 금융지원을 위한 기초적 연구

박상훈,백정훈,Park, Sang-Hoon,Baek, Cheong-Hoon 한국건설관리학회 2011 한국건설관리학회 논문집 Vol.12 No.2

서울의 경우 세계의 초대형도시에 못지않은 막대한 세대수를 보유하고 있으나, 지금까지 기존의 주택을 활용하거나 재이용하기 보다는 새로운 주택을 건설하는 등 성장위주의 주택정책으로 인해 기존 공동주택을 유지하고 재이용하는 정책개발에 대한 노력은 미비하였다. 서울의 아파트 또는 분당, 일산 등 1기 신도시가 건설된 지 약 20년이 되는 등 개보수가 필요한 수선주기가 다가옴에 따라 기존의 품질을 유지하고, 안전하게 활용하기 위해서는 기존 공동주택의 유지관리를 유도할 수 있는 론(loan) 보조금 세금우대프로그램 등 금융지원이 절실한 실정이다. 따라서, 본고에서는 세계적인 거대도시로서 다양한 주거형태를 보이고 있는 뉴욕시와 도쿄도의 론 보조금 세금우대프로그램 등 금융지원체계를 비교 분석하여 국내에 유지관리금융지원방안을 제안하였다. Seoul, although having a housing stock as huge as that of world metropolitan cities, have implemented growth-oriented policies by constructing new housing units rather than using or rehabilitating existing ones. There were, therefore, few political efforts to preserve and rehabilitate multiple dwellings. Today, substantial time has passed since multiple dwellings in Seoul and the first-stage new cities such as Bundang and Ilsan were constructed. What is required to maintain the quality of the existing housing and use it with safety is loan, subsidy and tax incentive programs which are able to promote the maintenance of existing multiple dwellings. The objective of this study is to compare and analyze the maintenance systems of financial assistance(the loan, subsidy and tax incentive programs)of the world's largest cities with various housing types, I e New York and Tokyo, and then to propose to Seoul a framework for the maintenance systems.

Ag가 함유된 전도성 도료의 제조 조건에 따른 고주파 특성

박상훈,김정표,성원모,Park, Sang-Hoon,Kim, Jeong-Pyo,Seong, Won-Mo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9

Dual band internal antennas were fabricated with Ag conducting paste of various preparation conditions and different print thickness by silk screen print. We have investigated microwave properties were compared Ag conducting paste antenna with copperplate antenna at 800 MHz and 1,800 MHz. Gain of Ag conducting paste antenna was improved when preparation conditions were the single size Ag particle, using dry type resin and high Ag containing percent. However, it was lower than that of copperplate antenna within $0.1\~2.0dBi$ at 800MHz. In addition, it was improved at 800MHz when thickness of Ag conducting paste was printed more than skin depth but it was held after critical print thickness. On the other hand, it was reached level of copperplate antenna at 1,800MHz.

파킨슨병 환자의 보행동결 검출을 위한 시간영역 알고리즘

박상훈,권유리,김지원,엄광문,이재호,이정환,이선민,고성범,Park, S.H.,Kwon, Y.R.,Kim, J.W.,Eom, G.M.,Lee, J.H.,Lee, J.W.,Lee, S.M.,Koh, S.B. 대한의용생체공학회 2013 의공학회지 Vol.34 No.4

This study aims to develop a practical algorithm which can detect freezing of gait(FOG) in patients with Parkinson's disease(PD). Eighteen PD patients($68.8{\pm}11.1yrs.$) participated in this study, and three($68.7{\pm}4.0yrs.$) of them showed FOG. We suggested two time-domain algorithms(with 1-axis or 3-axes acceleration signals) and compared them with the frequency-domain algorithm in the literature. We measured the acceleration of left foot with a 3-axis accelerometer inserted at the insole of a shoe. In the time-domain method, the root-mean-square(RMS) acceleration was calculated in a moving window of 4s and FOG was defined as the periods during which RMS accelerations located within FOG range. The parameters in each algorithm were optimized for each subject using the simulated annealing method. The sensitivity and specificity were same, i.e., $89{\pm}8%$ for the time-domain method with 1-axis acceleration and were $91{\pm}7%$ and $90{\pm}8%$ for the time-domain method with 3-axes acceleration, respectively. Both performances were better in the time-domain methods than in the frequency-domain method although the results were statistically insignificant. The amount of calculation in the time-domain method was much smaller than in the frequency-domain method. Therefore it is expected that the suggested time domain algorithm would be advantageous in the systematic implementation of FOG detection.

최소 제곱 무요소법을 이용한 적응 기법에 관한 연구

박상훈,권기찬,윤성기,Park, Sang-Hun,Gwon, Gi-Chan,Yun, Seong-Gi 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9

An h-adaptive scheme of first-order least-squares meshfree method is presented. A posteriori error estimates, which can be readily computed from the residual, are also presented. For elliptic problem the error indicators are further improved by applying the Aubin-Nitsche method. In the proposed refinement scheme, Voronoi cells are utilized to insert nodes at appropriate positions. Through numerical examples, it is demonstrated that the error indicators reveal good correlations with the actual errors and the adaptive first-order least-squares meshfree method is effectively applied to the localized problems such as the shock formation in fluid dynamics.