조합형 광섬유 트랜스듀서에 의한 요골맥파의 검출

박승환,홍승홍 ( Seung Hwan Park,Hong Seung Hong ) 한국센서학회 1998 센서학회지 Vol.7 No.3

The human pulse wave is a vital biosignal that includes the diagnostic data related with the heart and the cardiovascular system of human body. Based on the mechanical transducing method, a pulse detection transducer using optical fiber was developed to acquire the pulses non-invasively. To improve the detection efficiency, we proposed a new design that consists of two combinational parts; detecting part, which is in contact with the pulsating skin and transmits the displacement motion of the pulsating skin to the sensing part, and sensing part. which converts the physical quantity transmitted from the detecting part to electronic signal. By using the new method, we confirmed that the proposed transducer can detect the C point(incisura) and the T wave(tidal wave) which is not easily detected by existing transducers.

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.

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.

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.

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

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.

스마트 워터그리드 네트워크의 원격 단말기 보안을 위한 암호화 모듈에 관한 연구

박승환 ( Seung Hwan Park ),박형모 ( Hyung Mo Park ),김창복 ( Chang Bok Kim ) 한국항행학회 2013 韓國航行學會論文誌 Vol.17 No.6

본 논문은 스마트 워터그리드의 원격단말기와 상위 서버단간의 검침 및 제어 데이터의 안정적 전송을 위한 보안모듈에 대해 연구하였다. 제안한 보안모듈은 기존에 보급되어 사용 중인 보안성 없는 원격 단말기에 부착할 수 있도록 구현되었다. 특히, 전기 분야의 스마트그리드와는 달리 스마트 워터그리드는 배터리 전원을 사용하므로 저 전력을 고려하였으며, 지하에 설치되는 계량기 위치에 의한 습하고 열악한 환경이 대단위 네트워크시스템 구축 시 통신 장애 발생시키는 점을 고려하여 ARIA-GCM-128 대칭키 방식을 채택하였다. 본 논문의 암호화 모듈은 단말기의 검침 데이터와 상위 서버단의 제어 데이터에 대한 보안을 확보하고 임의로 위변조 되는 것을 방지하여 원격검침 시스템에 대한 안정성을 확보할 수 있도록 구현되었다. This paper studies the security module for the reliable transmission of the meter reading and the control data between the remote terminals and the upper server-side in smart water grid. The proposed security module was implemented to make it attachable to the remote terminal without security function. In particular, unlike the smart grid of electric field, the low power is considered due to the use of battery power in the smart water grid, and the ARIA-GCM-128 symmetric key method is adopted taking into the account that the damp and constrictive environments by the installed meter location in the underground occur a communication obstacle on building of the large-scale network system. The encryption module of this paper was devised to ensure the safety between the reading data on the terminal and the control data from the upper server, and secure the stability of the remote meter reading system by taking protection against an arbitrary alteration or modification.

CFD를 이용한 바이오 필터의 성능 검증

박승환(Seung Hwan Park),송두삼(Doo Sam Song) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

This study aims to verify the performance of bio-filter by analyzing the pressure drop and flow distribution characteristics according to the aggregate size and porosity which is a design factor of the bio-filter by CFD simulation method. In this study, the modeling method considering the characteristics of bio-filter was investigated, and the Porous media technique to express the performance of the shape of the actual bio-filter by numerical analysis was applied. The pressure drop of the bio-filter according to the aggregate size and mixing rate were analyzed. Also, the airflow distributions were analyzed. The contribution of this study is a proposal of the modeling method of bio-filter composed of aggregate in numerical analysis.

주민자치센터의 문화여가 프로그램 참가동기, 여가몰입, 여가만족 및 생활만족 특성의 관계

박승환 ( Seung Hwan Park ),문태영 ( Tae Young Moon ) 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.4

This study refers to examination in relationship of participatory motivation, leisure commitment, leisure satisfaction and living satisfaction in cultural leisure programs at local community center. The purpose of this study was to extend and promote user base of cultural leisure programs at local community center, and suggest basic academic materials through new insight into phenomena. To meet the goals, this study sampled total 206 persons(male and female) from users attending local community cultural center and they were asked to join a questionnaire survey. Here, a statistic program called SPSS 12.0 was used to conduct reliability analysis, independent sample t-test, one-way ANOVA, Scheffe`s post-hoc test, factor analysis, correlation analysis, and multiple regression analysis. The significance level of all statistic data was set at α=.05. As a result, these analyses came to the following conclusions: First, It was found that demographic variables had firsthand effects on participatory motivation, leisure commitment, leisure satisfaction and living satisfaction in cultural leisure programs at local community center. Second, It was found that there were more or less correlations among participatory motivation, leisure commitment, leisure satisfaction and living satisfaction in cultural leisure programs at local community center. Third, It was found that the characteristics of participatory motivation in cultural leisure programs at local community center had firsthand effects on leisure commitment and living satisfaction, but didn`t have direct effects on leisure satisfaction.

차압 측정을 통한 공동주택 기밀성능 예측방법의 제안 및 신뢰성 분석

박승환(Seung Hwan Park),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

This study propose a method of predicting the airtightness performance by using the pressure difference, which can replace the conventional blower door test method that can measure the airtightness performance. In order to verify the proposed method in this study, the predicted results were compared to the measured results using blower door test. The proposed method is similar to the blower door test, but there are some differences. This study measured the pressure difference in the front door and the building envelope, which can be easily measured, and calculated the airflow that pass to the building envelope based on the airflow at various pressure difference conditions shown in the airtightness report of the front door. This is possible because the amount of air flowing in and out under steady state conditions is always the same. Based on this, the airflow was calculated at several pressure difference conditions in the building envelope, and C and n were defined. With this, it is possible to calculate the airtightness performance in various pressure difference conditions. In order to verify the proposed method, this study measures the pressure difference and the airtightness performance in the building using the blower door test. The results are as follows; the value of C, n was calculated using the proposed method, and C was about 19.4 and n was about 0.895. The airtightness performance was predicted to be 3.25 (1/h@50 Pa). When the measured and predicted results were compared, there was no significant difference.