선별적 데이터 학습 기반의 베이지안 네트워크를 이용한 단기차량속도 예측

박성호,유영중,문상호,김영호,Park, Seong-ho,Yu, Young-jung,Moon, Sang-ho,Kim, Young-ho 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.12

정확한 교통정보의 예측은 출발지로부터 목적지까지의 최적경로를 제공할 수 있으며, 이로 인해 시간과 비용의 절감 효과를 얻을 수 있다. 본 논문에서는 다양한 교통정보 예측 방법 중 확률 모델을 기반으로 교통정보를 예측하는 베이지안 네트워크 방법을 이용한다. 기존 연구에서는 베이지안 네트워크 예측 방법이 모든 시간대에서의 데이터를 학습에 사용하는 것과는 달리, 본 논문에서는 예측하고자 하는 시간대와 동일한 요일과 시간에 해당하는 데이터만을 선별적으로 학습에 사용한다. 서로 다른 두 가지 학습방법에 따른 예측 결과의 정확도는 일반적으로 많이 사용되는 MAPE(Mean Absolute Percentage Error)로 검증하였으며, 서울 시내 14개의 링크 구간에 대해 실험을 진행하였다. 실험결과는 본 논문에서 제안한 방법이 모든 시간대의 데이터를 학습에 사용한 방법에 비해 MAPE의 관점에서 더 높은 정확도를 가진 교통 예측 값을 계산할 수 있음을 보여준다. The prediction of the accurate traffic information can provide an optimal route from the place of departure to a destination, therefore, this makes it possible to obtain a saving of time and money. To predict traffic information, we use a Bayesian network method based on probability model in this paper. Existing researches predicting the traffic information based on a Bayesian network generally used to study the data for all time. In this paper, however, only data corresponding to same time and day of the week to predict selectively will be used for learning. In fact, the experiment was carried out for 14 links zone in Seoul, also, the accuracy of the prediction results of the two different methods should be tested with MAPE (Mean Absolute Percentage Error) which is commonly used. In view of MAPE, experimental results show that the proposed method may calculate traffic prediction value with a higher accuracy than the method used to learn the data for all time zones.

Power-Gen International(PGI) 2008 참관기(2)

박성호,Park, Seong-Ho 대한전기협회 2009 전기저널 Vol.- No.385

치과용복합레진과의 결합에 있어, 상아질 내 교원섬유의 역할에 관한 연구

박성호,Park, Seong-Ho 대한치과보존학회 1997 Restorative Dentistry & Endodontics Vol.22 No.1

The purpose of this study was to investigate the effects of moistening mechods of dentin on the morphologic states of hybrid layers and on the interfacial bond strength between dentin and composite. Specimens were divided into 6 groups based on the surface moistening methods and materials used. After the dentin surface was conditioned with 10 % phoporic acid and irrigated: 1. The dentin surface was dried. Then bonding agent and composite were applied. 2. The dentin surface was blot-dryed. Then primer, bonding atent and composite were applied. 3. The dentin surface was dryed first. Within 20 seconds, the surface was rewetted, then primer, bonding agent and composite were applied. 4. The dentin surface was dryed. Then primer, bonding agnent and composite were applied. 5. The dentin surface was dryed first. Atter 24hrs, the surface was rewetted, and then primer, bonding agent and composite were applied. 6. The surface was conditioned with NaOCl for 5min. Then primer, bonding agent and composite were applied. To reveal the hybrid layer, scanning electron microscopy was used after the samples were ion beam etched. The shear bond strength of each group was tom pared by ANOVA. In groups 2, 3 and 4, the hybrid layer was clearly visible, but the width was more limited in group 4. In group 1 and 5, the hybrid layer was not found, and a gap was formed between dentin and composite. In group 6, the hybrid layer was not found, but the interface between the dentin and composite was intimate. The shear bond strength of each group was as follows: Group 1 : 4MPa, Group 2 : 14MPa, Group 3 : 12MPa, Group 4 : 14MPa, Group 5 : 5MPa, Group 6 : 9MPa.

인테넷상에서 NOD 서비스를 위한 연속미디어 전송 및 푸쉬-캐싱 기법

박성호,임은지,최태욱,정기동,Park, Seong-Ho,Im, Eun-Ji,Choe, Tae-Uk,Jeong, Gi-Dong 한국정보처리학회 2000 정보처리논문지 Vol.7 No.6

In multimedia new service on the internet, there are problems such as server overload, network congestion and initial latency. To overcome these problems, we propose a proxy push-caching scheme that stores a portion of continuous media stream or entire stream, and a transmission scheme of NOD continuous media, RTP-RR and RTP-nR to exploit push-caching scheme. With the proposed push-caching scheme, NOD server pushes fixed portion of stream to a proxy when new data is generated, and the cached size of each stream changes dynamically according to the caching utility value of each stream. As a result, the initial latency of client side could be reduced and the amount of data transmitted fro ma proxy server to client could be increased. Moreover, we estimate a caching utility value of each stream using correlation between disk space occupied by the stream and the amount of data stream requested by client. And we applied the caching utility value ot replacement policies. The performance of the proxy push-caching and continuous media transmission schemes proposed were compared with other schemes using simulations. In the simulation, these schemes show better results than other schemes in terms of BHR (Byte Hit Rate), initial latency, the number of replacement and packet loss rate.

건식 식각기술의 동향분석

박성호,김진섭,강봉구,Park, Seong-Ho,Kim, Jin-Seop,Gang, Bong-Gu 한국전자통신연구원 1989 전자통신동향분석 Vol.4 No.2

본 연구에서는 초고집적 반도체소자의 제작을 위한 건식 식각장비의 기술동향 분석과 식각공정에 대한 요구조건 추출 및 실제의 공정예를 검토함으로써 submicron급의 초미세형상을 가공하는데 이방성과 저손상의 중요한 특성을 갖는 ECR 플라즈마, 특히 저온의 식각방식이 차세대의 건식 식각장치의 주류가 될 것임을 예측하였다.

인지시학을 적용한 문화재 야행(夜行) 프로그램 구현 전략

박성호,Park, Seong-Ho 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.10

As globalization progresses and localization takes place, interest in local culture is increasing. In line with this trend, the Cultural Heritage Administration has been promoting the Cultural Heritage Night Tour Project as a night-type cultural property tourism content since 2016. Cultural property nightlife, part of the regional regeneration project, creates new added value by converging and combining various historical and cultural-related contents centered on local cultural heritage. Although the "cultural nightlife" has been greatly activated, it is judged that changes are needed to continue. This is because fixed nightlife programs are positive in terms of establishing a nationwide network, but there is a limitation in that they cannot be standardized and expanded to various forms. Therefore, in this study, the meaning and limitations of nightlife programs were identified, and cognitive theory applicable to nightlife programs was considered. Through this process, it was confirmed that cognitive poetry's 'circular for dynamic semantic composition', 'surreal foreground', and 'adventures in time and space' can be applied to nightlife programs. As a result of combining cognitive poetry with nightlife programs, it was possible to present a strategy for implementing nightlife programs differentiated from existing nightlife programs.

ECR 플라즈마를 이용한 반도체 공정기술

박성호,강봉구,Park, Seong-Ho,Kang, Bong-Koo 한국전자통신연구원 1988 전자통신동향분석 Vol.3 No.2

ECR 플라즈마는 활성도가 크고 지향성이 강한 고에너지 빔으로서, 고속.고정밀.고 선택비의 식각공정과, 저온.저손상.고 평탄화의 증착공정, 3차원 구조에도 불순물을 원하는 깊이만큼 도우핑할 수 있는 불순물 주입공정 등에 폭넓게 응용될 수 있다.

K-사용자 X 네트워크에서 다중안테나를 이용한 완전 간섭정렬기법

박성호,박기홍,김명진,고영채,Park, Seong-Ho,Park, Ki-Hong,Kim, Myeong-Jin,Ko, Young-Chai 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2

In wireless X networks where all transmitters send the independent messages to all receivers, the theoretical bound on the degrees of freedom (DOF) and interference alignment (IA) scheme for its achievability are given by Cadambe and Jafar [1]. However, IA scheme for wireless X network may be infeasible in practice unless the transmitters have the perfect channel information. In addition, if the transmitter with single antenna uses time-varying channel coefficients as a beamforming vector, the infinite channel extension is required to achieve the theoretical bound on the DOF of wireless X networks with perfect IA scheme. In this paper, we consider K-user MIMO X network where K transmitters and K receivers have M antennas each. While the beamforming vectors have been constructed with multiple channel uses over multiple time slot in the earlier work, we consider the beamforming vectors constructed only by a spatial signature over unit time. Accordingly the channel information at the transmitters can be available instantaneously. Then we propose the perfect IA scheme with no channel extension. Based on our sum-rate analysis and the simulation results, we confirm that our proposed scheme can achieve MK/2 DOF which is quite close to the theoretical bound on the DOF region of wireless X networks.

비균일 열전도성 반응블럭의 반응특성 연구

박성호,윤여일,김성현 ( Seong Ho Park,Yea Il Yoon,Sung Hyun Kim ) 한국공업화학회 1997 공업화학 Vol.8 No.5

암모니아와 금속염과의 기-고 반응을 이용한 화학열펌프에서 열전달 특성과 물질전달 특성을 개선하기 위하여 금속염을 팽창흑연에 반지름 방향으로 겉보기 밀도가 증가하도록 함침시켜 새로운 비균일 열전도성 반응블럭을 제조하였다. 이것은 겉보기 밀도가 반지름 방향으로 165, 222, 279, 337, 394(kg/m³)로 증가하도록 만든 것으로 균일 열전도성 반응블럭과 반응특성을 비교하였다. 실험결과 열전달특성은 비균일 열전도성 반응블럭이 훨씬 좋았고, 반응을 반복함에 따라 물질전달과 반응특성이 개선되었으며 반응의 재현성도 양호함을 알 수 있었다. The nonuniform thermal conductive reaction blocks were manufactured by impregnation of metal salts on the expanded graphite to improve the heat and mass transfer ability of reaction block for the chemical heat pump using the reaction of ammonia and metal salts(halide). The nonuniform blocks were designated to increase apparent density, like 165, 222, 279, 337, 394 kg/m³ radially. The experimental results showed that the heat transfer characteristics of nonuniform blocks were better than uniform blocks. As the reaction of ammonia repeated, the volumetric expansion in the reaction block makes the mass transfer improve, and the reproducibility better.

시각장애인도서관 직원들의 조직몰입에 영향을 미치는 요인에 관한 연구

박성호,조미아,Park, Seong-ho,Cho, Miah 한국비블리아학회 2021 한국비블리아학회지 Vol.32 No.3

이 연구는 시각장애인도서관 직무에 종사하는 직원들의 조직몰입에 영향을 미치는 요인을 파악하는데 그 목적이 있다. 이를 위해 조직몰입에 영향을 주는 요인으로는 개인적 배경, 감정노동, 역할, 직무특성, 조직문화, 조직공정성으로 선정하였다. 선정된 요인들은 양적 검증에 질적 검증을 보완한 혼합연구 방법을 사용하였으며, 양적 검증은 수집된 설문지를 대상으로 통계와 분석을 진행하였다. 질적 검증으로는 희망하는 현직자와 전문가를 대상으로 설문지 내용을 면담지로 재구성한 후에 면담을 실시하였다. 연구 결과를 요약하면 감정노동, 직무특성, 조직문화, 조직공정성이 직원들의 조직몰입에 영향을 미치는 요인으로 분석되었다. 직무몰입을 향상시키기 위해서는 담당업무에 대한 조직의 간섭을 최소화하고 재량권 확대를 통한 자율성 보장해 주어야 하며, 직원들의 감정노동에 대해 조직 차원의 집중 관리와 업무성과에 대한 공정한 절차를 거치는 것이 매우 중요하다. The study has a purpose of understanding the factors that affect the oranizational commitment of the employees working in the libraries for visually impaired. To do this, the study chose personal background, emotional labor, role, job characteristics, organizational culture and organizational justice and attempted to find out how these factors affect the oranizational commitment. As a research method, mixed study method was used where quantitative analysis was complemented by qualitative analysis. For quantitative analysis, statistical analysis was conducted using the retrieved questionnaires. For qualitative analysis, the researcher had a one-on-one talk with the experts and employees who want to participate using an interview note was recomposed based on the survey responses. In the study results, emotional labor, job characteristics, organizational culture and organizational justice was proven to have influence on job engagement. To improve the job engagement, autonomy should be guaranteed by minimizing the organizational intervention to the assigned works and expanding the discretionary power. Furthermore, intensive management of the employees' emotional labor and fair process regarding the work performance is highly important.