Wireless LAN 환경에서 임베디드 SIP User Agent 구현

박승환,이재흥,Park Seung-Hwan,Lee Jae-Heung 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.3

본 논문은 무선의 임베디드 시스템 환경에서, VoIP 시스템을 구성하는 프로토콜 요소 중의 하나인 SIP를 이용한 User Agent의 구현에 관한 연구이다. User Agent는 설정 블록과, 주변 장치를 제어하기 위한 디바이스 쓰래드 블록, SIP 메시지를 처리하기 위한 SIP 스택 블록으로 구성하였다. 디바이스 쓰래드는 RTP 쓰래드 블록과 사운드 카드 처리 블록으로 구성하였으며, SIP 스택은 프락시 이벤트를 처리하는 워커 쓰래드 블록과 SIP 메시지를 전송하여 처리하는 SIP 트랜시버 및 SIP 쓰래드 블록으로 구성하였다. 하드웨어 플랫폼은 Intel XScale PXA25S 프로세서 기반에 플래쉬 메모리, SDRAM, AC'97 오디오 코덱, 무선 랜카드와 연결된 PCMCIA 소켓이 내장된 보드를 구성하였으며, 오디오 입출력으로 마이크로폰과 헤드폰을 사용하였다. 본 연구의 실험을 위한 타겟 시스템 구성은 임베디드 리눅스 커널 2.4.19를 포팅하였다. 임베디드 시스템의 자원 효율을 높이고자, User Agent의 속성과 SIP 메소드의 기능을 최소화하였고, TCP를 배제하여, 주변 장치 제어를 최소화함으로써, 자원의 소비를 $12.9\%$ 절감할 수 있었다. This paper is about the research of the User Agent implementation under wireless embedded environment, using SIP which is one of protocol components construct the VoIP system. The User Agent is made of the User Agent configuration block, the device thread block to control devices and the SIP stack block to process SIP messages. The device thread consists of the RTP thread and the sound lard device processing block. Futhermore, the SIP stack consist of the worker thread to process proxy events, the SIP transceiver and SIP thread to transfer and receive SIP messages. The H/W platform is a board included the Intel's XScale PXA255 processor, flash memory, SDRAM, Audio CODEC module and wireless LAN threough PCMCIA socket, furthermore a microphone and headphone is used by the audio 1/0. The system has embedded linux kernel 2.4.19. For embedded environment, the function of User Agent and SIP method is diminished. Finally, the resource of system could be reduced about $12.9\%$, compared to overall system resource, by minimizing peripherals control and excepting TCP.

사례 분석을 통한 IoT 기반 화재탐지시스템의 화재 감지신호 특성

박승환,김두현,김성철,Park, Seung Hwan,Kim, Doo Hyun,Kim, Sung Chul 한국안전학회 2022 한국안전학회지 Vol.37 No.3

This study aims to provide a fundamental material for identifying fire and no-fire signals using the detection signal characteristics of IoT-based fire-detection systems. Unlike analog automatic fire-detection equipment, IoT-based fire-detection systems employ wireless digital communication and are connected to a server. If a detection signal exceeds a threshold value, the measured values are saved to a server within seconds. This study was conducted with the detection data saved from seven fire accidents that took place in traditional markets from 2020 to 2021, in addition to 233 fire alarm data that have been saved in the K institute from 2016 to 2020. The saved values demonstrated variable and continuous VC-Signals. Additionally, we discovered that the detection signals of two fire accidents in the K institution had a VC-Signal. In the 233 fire alarms that took place over the span of 5 years, 31% of smoke alarms and 30% of temperature alarms demonstrated a VC-Signal. Therefore, if we selectively recognize VC-Signals as fire signals, we can reduce about 70% of false alarms.

한반도 대운하-인간과 자연, 일터와 쉼터가 어우러지는 21세기 다목적 프로젝트

박승환,Park, Seung-Hwan 한국기술사회 2008 技術士 Vol.41 No.2

The construction of korea grand canal supplys nation as below:$\Delta$ return to clean and clear river $\Delta$ offer urbanite space for re-charging $\Delta$ offer local resident tourist attractions $\Delta$ alternative for global warming $\Delta$ economic project for development and growth $\Delta$ awake sleeping inland city $\Delta$ strengthen business competitiveness $\Delta$ reduction of logistic cost

여성전문병원 병동부의 거주성 향상을 위한 건축 계획적 연구

박승환,홍성우,최무혁,Park, Seung-Hwan,Hong, Sung-Woo,Choi, Moo-Hyuck 한국주거학회 2007 한국주거학회 논문집 Vol.18 No.2

The purpose of this study was to provide the basic data for architectural planning through survey about the ward of women's hospital. This study considered the concept of women's hospital through theoretical consideration and analysed a blueprint of 30 cases about typical plan type, the size and layout of patient-room, space allocation and circulation. And then a survey of patients has to identify their needs. Because the rate of composition of an upper grade patient-room in women's hospital is higher than that of general hospital to improve habitability in ward needs not only the importance of the planing of patient-room itself, but also providing a small courtyard, day-room between the patient-rooms or outdoor terrace. When patient moves it was provided visual comfort and strengthen social exchange. Also, physical environment has to reflect mother's psychological needs and diversity by individuality in unit is essential to planning.

도심지내 분수유형별 음이온 분포 및 상관성 분석

김정호 ( Jeong Ho Kim ),박승환 ( Seung Hwan Park1 ),김원태 ( Won Tae Kim ),윤용한 ( Yong Han Yoon ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.12

In order to verify the healing effect in the variety of effects according to fountain type, anion which is the representatives factor of healing, as the center of case studies which in Gwanghwamun(Ground fountain), Cheonggyecheon(Waterfall) and Myeongdong(Formative fountain). According to fountain type, the anion distribution as follow, figures typically 15,721 ± 419 ea/cm³, Formative fountain 40,190 ± 788 ea/cm³, Waterfall 4,480 ± 290 ea/cm³ and ground fountain 2,492 ± 180 ea/cm³. It is usually exceed to the distribution in natural green, which is 1070∼2100 ea/cm³. The interrelation between air temperature, relative humidity, wind speed and relative humidity, and wind speed is that, the relative humidity is directly proportional to wind speed and inversely proportional to temperature. As the temperature goes up, the distribution of anion goes down. And as the wind speed and relative humidity goes up, the distribution of anion decrease sharply. The result of interrelation between fountain type and the anion distribution is that, the distance of water falling is directly proportional to the anion distribution in the formative fountain and inversely proportional in the ground fountain. And the distribution of anion is largest in formative fountain. The distribution of anion in ground fountain is lower than in formative fountain, but it is far more than in natural greenery. And as the distance from fountain increase, the distribution of anion goes down.

스포츠센터 종사자의 감정노동과 직무탈진의 관계에서 긍정심리자본의 매개효과

박승환(Park, Seung-Hwan) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.2

The purpose of this study examined the analysis of relationship among emotional labor, positive psychological capital and job burnout of sports center employee. Through convenience sampling method, selected 244 survey questionnaires were used for final analysis from sports center employee. With the collected data, descriptive analysis, factor, correlation, multiple regression and mediation were performed by SPSS WIN 21.0 & AMOS 2 1.0. The results of this study are as follows. First, the surface acting of sports center employee had negative effect on positive psychological capital, the deep acting had positive effect. Second, the surface acting of sports center employee had positive effect on job burnout, the deep acting had negative effect on cynicism and decreased occupational efficacy. Third, the positive psychological capital of sports center employee had negative effect on job burnout. Fourth, the positive psychological capital fully mediated effect between emotional labor and job burnout. These above results suggest that emotional labor is involved in positive psychological capital and job burnout, and the higher psychological capital the lower job burnout.

시각적 정보처리 결함을 완화하는 가상 색 오버레이 구현

박승환(Park, Seung Hwan),최훈일(Choi, Hoon Il),장영건(Jang, Young Gun) 한국장애인재활협회 1997 재활복지 Vol.12 No.1

난독증 학습장애는 주로 뇌의 음운적 정보처리 결함에 의하여 발생하는 것으로 알려져 왔으나, 최근에 시각적 정보처리 결함도 주요 원인이라는 것이 밝혀지고 있다. 색 오버레이는 난독증자들에게 빈번하게 나타는 시각적 정보처리 결함의 일종인 광과민성증후군과 주의력 결핍을 완화시키는 보조도구로써 20년 이상 유용하게 사용되고 있다. 본 연구에서는 컴퓨터에서 사용할 수 있는 가상 색 오버레이를 S/W로 구현하였다. 기존 색 오버레이의 색 특성을 규명하기 위하여 세 종류의 색 오버레이의 색도와 투과율을 측정하고, 측정된 값들을 가상 색 오버레이에 반영하였다. 구현된 오버레이는 플라스틱 오버레이에 비하여 휴대할 필요가 없으며, 크기와 색을 쉽게 조정할 수 있어, 주변 조명 환경과 디지털 콘텐츠의 크기 변화에 쉽게 적응할 수 있는 장점이 있다. 이 S/W 도구를 사용하면 컴퓨터로 제공되는 디지털 콘텐츠를 읽을 때 발생되는 두통, 읽기 속도저하, 패턴 섬광 현상들을 줄일 수 있다. 본 연구에서 개발한 가상 색 오버레이는 난독증 학습장애인뿐만 아니라 시각적 스트레스를 가진 일반인의 컴퓨터 접근성을 향상시키며, elearning 활용에 도움을 줄 것으로 판단된다.

생체신호 응용기기를 위한 복합형 체온측정 시스템 개발

박승환(Seung-hwan Park),신재우(Jae-woo Shin),한영환(Young-hwan Han) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.6

The body temperature is represented with the vital sign which is included in the biophysical information of diagnosis. For that reason, it must be always checked for all diseases. Therefore, detecting the body temperature precisely and quickly is very important at this time. This paper concerns the development of a hybrid temperature measurement system for bio-signal application device. As a result, this system uses an measurement method by IR sensor with an noncontact type, with an fast response time and accuracy of 0.2 ℃. Also, it is raised the accuracy of temperature measurement under consideration of an ambient temperature compensation. And it is possible to measure the temperature of eardrum & forehead with only one system.

당구클럽의 서비스스케이프와 소비자 감정반응 및 소비자 행동의도의 관계

박승환(Park, Seung-Hwan) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.2

The purpose of this study examined the analysis of relationship among servicescape, affect response and consumer behavior intention of billiards club. Through convenience sampling method, selected 306 survey questionnaires were used for final analysis from billiards club consumer. With the collected data descriptive analysis, factor, correlation, and structural equation model analysis were conducted by SPSSWIN 21.0 & AMOS 21.0. The analysis results are as follows. First, the servicescape of billiards club had positive influence on their consumer affect response. Second, the servicescape of billiards club had positive influence on their consumer behavior intention. Third, the consumer affect response of billiards club had positive influence on their consumer behavior intention. Fourth, the consumer affect response mediated relationship between servicescape and consumer behavior intention.

스크린 골프장의 마케팅믹스와 고객만족 및 충성도의 관계

박승환(Park Seung-Hwan),최영수(Choi Young-Soo) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.1

The objectives of this study are to clarify how the marketing mix affects the customers’ satisfaction and loyalty. These show that the core factors among screen golf course marketing mix to raise customer’s satisfaction are product and price. So, the screen golf course should provide good quality products and offer understandable price to its customers. Also it was found that to raise customer’s loyalty which is the core factor, even though the loyalty becomes intensified spontaneously as the customer’s satisfaction in product vs price and price vs product are high, the marketing strategy with active promotion can encourage customer satisfaction.