트렐리스 부호화된 8PSK/CPSC를 위한 RSSE 방식

고상보,좌정우 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2

A reduced-state sequence estimation(RSSE) for trellis-coded(TC) 8PSK/cyclic prefixed single carrier(CPSC) with minimum mean-square error-liner equalization(MMSE-LE) on frequency-selective Rayleigh fading channels is proposed. The Viterbi algorithm(VA) is used to search for the best path through the reduced-state trellis combined equalization and TCM decoding. The symbol error probability of the proposed scheme is confirmed by computer simulations.

Tone Dual-Channel Directional MAC Protocol for Mobile Ad-Hoc Networks

Jwa Jeong Woo 한국콘텐츠학회(IJOC) 2011 International Journal of Contents Vol.7 No.2

The directional MAC (DMAC) protocol improves the spatial reuse, but directional packets on the control channel cause the deafness problem. In this paper, we propose a tone dual-channel DMAC protocol for mobile ad-hoc networks. In the proposed MAC protocol, the use of omnidirectional transmissions using an omnidirectional out-of-band tone solves the deafness problem and decrease packet collisions on the control channel. The use of an omnidirectional out-of-band tone also mitigates the hidden terminal problem. We use the negative CTS (NCTS) mechanism to solve the exposed terminal problem. The throughput performance of the proposed MAC protocol is confirmed by simulations using the Qualnet simulator.

Pedestrian Network Models for Mobile Smart Tour Guide Services

Jeong-Woo Jwa 한국인터넷방송통신학회 2016 International Journal of Internet, Broadcasting an Vol.8 No.1

The global positioning system (GPS)-enabled mobile phones provide location- based applications such as car and pedestrian navigation services. The pedestrian navigation services provide safe and comfortable route and path guidance for pedestrians and handicapped or elderly people. One of the essential components for a navigation system is a spatial database used to perform navigation and routing functions. In this paper, we develop modeling and categorization of pedestrian path components for smart tour guide services using the mobile pedestrian navigation application. We create pedestrian networks using 2D base map and sky view map in urban area. We also construct pedestrian networks and attributes of node, link, and POI using on-site GPS data and photos for smart pedestrian tour guide in the major walking tourist spots in Jeju.

Mobile Art Park Guidance Application using Mobile MAP Open API

Jwa Jeong Woo,Ko Sang Bo,Lee Deuk Woo 한국콘텐츠학회(IJOC) 2011 International Journal of Contents Vol.7 No.2

In this paper, we develop a mobile MAP open API using HTML5 local storage and the W3C geolocation API. The mobile MAP open API consists of the basic JavaScript MAP API, offline navigation API, and multimedia POI (mPOI) API. The basic JavaScript MAP API creates a map and controls, rotates, and overlays data on the map. The offline navigation API is developed using HTML5 local storage and web storage. The mobile web application downloads and stores mPOIs of works of art to local storage or web storage from a web server. The mPOI API is developed using HTML5 video and audio APIs. We develop a mobile art park guidance application using the developed mobile MAP open API.

Pedestrian Network Models for Mobile Smart Tour Guide Services

Jwa, Jeong-Woo The Institute of Internet 2016 International Journal of Internet, Broadcasting an Vol.8 No.1

The global positioning system (GPS)-enabled mobile phones provide location-based applications such as car and pedestrian navigation services. The pedestrian navigation services provide safe and comfortable route and path guidance for pedestrians and handicapped or elderly people. One of the essential components for a navigation system is a spatial database used to perform navigation and routing functions. In this paper, we develop modeling and categorization of pedestrian path components for smart tour guide services using the mobile pedestrian navigation application. We create pedestrian networks using 2D base map and sky view map in urban area. We also construct pedestrian networks and attributes of node, link, and POI using on-site GPS data and photos for smart pedestrian tour guide in the major walking tourist spots in Jeju.

Poster Session : PS 1052; Gastroenterology (Gastrointestinal Tract) ; A Case of Esophago Mediastinal Fistula Due to Tuberculous Mediastinal Lymphadenitis

( Jwa Hoon Kim ),( Do Hoon Kim ),( Hee Young Yoon ),( Ji Wan Lee ),( Hyung Woo Cho ),( Soo Min Jeung ),( Eun Jeong Gong ),( Hwoon Yong Jung ),( Jin Ho Kim ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Tuberculosis rarely involves the esophagus, and the most esophageal tuberculosis occurs secondary to adjacent tuberculous lymphadenitis. Esophago-mediastinal fi stula is very rare complication of tuberculous lymphadenitis. A 28-year-old, previously healthy female visited the outside hospital due to nausea, vomiting, and fever. Chest CT(Computed tomography) showed enlargement of multiple, mediastinal lymph nodes with air density in the mediastinum, and thus suggesting an esophago-mediastinal fi stula. Esophagogram showed the extraluminal contrast leakage in cervical esophagus. Esophagogastroduodenoscopy(EGD) showed the deep ulcer with the fi stula opening at 24cm from the upper incisor teeth. Tuberculosis(Tb) polymerase chain reaction(PCR) on the sputum was positive. A biopsy of the right subclavian lymph node revealed necrotizing granuloma with Tb PCR positive. We diagnosed as tuberculous mediastinal lymphadenitis with esophago-mediastinal fi stula. The referring doctor failed to close the fi stula by endoscopic clipping. Therefore, we decided to use anti-Tb medications to treat fi stula via gastrostomy, because of severe nausea and vomiting. After four weeks, EGD and esophagogram showed that the fi stula opening was closed. The present case highlights the importance of anti-Tb medications in treatment of esophago-mediastinal fi stula due to tuberculous mediastinal lymphadenitis. n.

Dental Survey for Primary School Student at Anseong-si

Hae-Woo Lee,Nam-Joong Kim,Su-kyung Jwa,Hag-Ryong Moon,Jae Hyun Jeong 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.1

Objective: The study examined the effect of the water fluoridation concentration project on the children living in Anseong-si in preventing dental caries and the occurrence of staining. Methods: The author has surveyed 249 primary school students on oral examination, in order to appraise the caries prevention effect for water fluoridation at Anseong-si. Decay-missing-filled rate (DMF rate), decay-missing-filled tooth index (DMFT index), decay-missing-filled surface index (DMFS index), decay tooth rate (DT rate), missing tooth rate (MT rate), filled tooth rate (FT rate), and dental fluorosis were calculated and analyzed on age 10. Results: DMFT index of fluoridated area was examined as 0.72±1.40, and DMFT index of non-fluoridated area was examined as 1.14±1.65. There was significant difference between fluoridated area and non-fluoridated area (p<0.05). DMFS index of fluoridated area was examined as 0.94±2.05, and DMFS index of non-fluoridated area was examined as 1.49±2.27. There was significant difference between fluoridated area and non-fluoridated area (p<0.05). There was no statistical difference for mottled enamel index between fluoridated area and non-fluoridated area (p>0.05) Conclusion: During the water fluoridation, the preventive effect went up as the time passes and the incidence of mottled tooth did not showed big difference. There water fluoridation for dental caries prevention in Anseong-si should be maintain for the health of Anseong-si residents.

밀리미터파 통신 파티클 필터 기반 고속 빔 추적 기술

강정완(Kang Jeong Wan),좌혜경(Jwa Hye Kyung),김선우(Kim Sun Woo) 한국통신학회 2018 한국통신학회 학술대회논문집 Vol.2018 No.11

Dental Survey for Adolescent at Anseong-si as Water Fluoridated Area

Jae Hyun Jeong,Hae-Woo Lee,Nam-Joong Kim,Hag-Ryong Moon,Su-Kyung Jwa 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.2

Objective: The aim of this study is to investigate difference in caries prevention effect and tooth fluorosis between fluoridated area and unfluoridated area in regards to water fluoridation business which is one of dental caries prevention program of Anseong, Gyeonggi. Methods: The authors conducted oral examination and questionnaire study to middle school students (12 years old) and high school students (15 years old), and statistics of dental caries experience and fluorosis index result were caculated and analyzed. Results: Decayed, missing, or filled permanent teeth (DMFT) index in middle school student (12 years old) according to gender was shown as man 1.74±2.28, woman 1.43±2.26 which was statistically insignificant (p>0.05), results according to water fluoridation was shown as unfluoridated 2.03±2.49, fluoridated 1.05±1.93 which was statistically significant (p<0.05), and results according to fluoridated water drinking was shown as not drinking 1.88±2.48, drinking 0.84±1.59 which was statistically significant (p<0.05). DMFT index in high school student (15 years old) according to gender was shown as man 2.61±2.58, woman 2.82±2.82 which was statistically insignificant (p>0.05), results according to water fluoridation was shown as unfluoridated 2.93±2.66, fluoridated 2.53±2.77 which was not statistically significant (p>0.05), and results according to fluoridated water drinking was shown as not drinking 2.92±2.78, drinking 2.29±2.52 which was not statistically significant (p>0.05). Conclusion: During the water fluoridation, the preventive effect went up as the time passes and the incidence of mottled tooth did not showed big difference. There water fluoridation for dental caries prevention in Anseong-si should be maintain for the health of Anseong-si residents.

Smart Tourism Information System and IoT Data Collection Devices for Location-based Tourism and Tourist Safety Services

Tae-Seung Ko,Byeong-Joo Kim,Jeong-Woo Jwa 국제문화기술진흥원 2022 International Journal of Advanced Culture Technolo Vol.10 No.1

The smart tourism service provides services such as travel planning and tour guides to tourists using key technologies of the 4th industrial revolution, such as the Internet of Things, communication infrastructure, big data, artificial intelligence, AR/VR, and drones. We are developing smart tourism services such as recommended travel products, my travel itinerary, tourism information, and chatbots for tourists through the smart tourism app. In this paper, we develop a smart tourism service system that provides real-time location-based tourism information and weather information to tourists. The smart tourism service system consists of a smart tourism app, a smart tourism information system, and an IoT data collection device. The smart tourism information system receives weather information from the IoT data collection device installed in the tourist destination. The location-based smart tourism service is provided as a smart tourism app in the smart tourism information system according to the Beacon’s UUID in the IoT data collection device. The smart tourism information system stores the Beacon’s UUIDs received from tourists and provides a safe hiking service for tourists.