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.

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.

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.

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

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.

보문 : 보습제의 종류와 pH에 따른 피부 각질층의 팽윤 및 레올로지 특성에 관한 연구

박승환 ( Seung Hwan Park ),하병조 ( Byung Jo Ha ) 대한미용학회(구 대한미용과학회) 2010 대한미용학회지 Vol.6 No.4

Skin is the largest organ of the body as determined by its wet weight or by its surface area. The swelling and rheological properties are very important factor in human dermatology. It is known that a relationship exists between the swelling and rheological property. Female pig skin 45~50 g were kept under conventional laboratory conditions. Dorsal hairs, over an area of approximately 8 cm2, were shaved with electric clipper 1 day prior to the experiment. Crude sample of pig Stratum Corneum (SC) was prepared with 0.1 M tris buffer pH 7.2 (2 M urea, 0.5% trypsin) solution (78 hr) at 37℃. The sample was further purified from n-hexane during 5 hr. The sample pieces (1.5 mm×15 mm) of pig SC were weighted and immersed in the appropriate test solution and reweighed after the immersion to estimate the extent of swelling of the sample in each pH controlled solutions. Moisture contents for pig SC were measured under various humidity conditions. The mechanical properties of pig SC were also estimated by rheometer. The results showed the acidic pH solution gives the pig SC its toughness, an important mechanical property primarily attributable to the intra- and intermolecular interactions of keratin molecules. At pH 3~5, keratin molecules were considered to be oppositely charged and electrostatically bound to each other. Above pH 7, the swelling of pig SC was ascribed to the deionization of the amino groups, which would break the electrostatic linkage between the two functional groups and make the protein chains negatively charged. However, to clarify the swelling and rheological mechanism of the human SC, further study is needed with quantitative investigation on the charge density of the keratin molecule and the distribution of ionic species between keratin molecule and the ambient solution.

차압을 이용한 기밀성능 예측방법에서 실내외 온도차 및 건물 높이차의 의존성 검토

박승환(Seung Hwan Park),송두삼(Doo Sam Song) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6

The purpose of this paper is to examine the dependence on indoor and outdoor temperature difference and building height differences in the method of predicting the airtightness performance by using the differential pressure in high-rise buildings. In this study, in order to achieve this purpose, case study was conducted under the building condition with various floors and the condition of various outdoor temperature. The height difference of the building was similar to the measured value as the height of the building increased from the neutral zone. The indoor and outdoor temperature difference was similar to the measured value as the indoor and outdoor temperature difference increased. The predicted differential pressure condition similar to the measured value was predicted to be airtightness performance value similar to the measured value as the differential pressure increases, and is difficult to apply at low differential pressure. However, the method of predicting airtightness performance using pressure difference could be applied in various conditions because the high pressure difference can be formed in a high-rise residential buildings in winter.

Application of data-driven control charts in semiconductor packaging process

Seung Hwan Park(박승환),Seongwon Jang(장성원),Sang-Hoon Park(박상훈),Jun-Geol Baek(백준걸) 한국경영과학회 2016 한국경영과학회 학술대회논문집 Vol.2016 No.4

노치 형상 및 장약조건의 변화에 따른 균열발생양상에 관한 연구

박승환(Seung-Hwan Park),조상호(Sang-Ho Cho),김승곤(Seung-Kon Kim),김광염(Kwang-Yeom Kim),김동규(Dong-Gyou Kim) 한국암반공학회 2010 터널과지하공간 Vol.20 No.1

암반발파에서 평활한 파단면을 확보하고 굴착손상영역을 제어하기 위하여 노치장약공을 이용한 균열제어 공법이 제안되었다. 본 연구에서는 노치형상과 장약조건이 균열발생 및 성장에 미치는 영향을 살펴보기 위하여 날개형 노치장약공을 갖는 발파모델을 구축하고 동적 파괴과정 해석법을 이용한 암반 파괴과정 해석을 수행하였다. 그 결과, 노치 길이가 증가함에 균열의 성장 길이가 증가하며 파단면의 거칠기가 감소하고 장약공 상하부에 손상균열의 발생이 억제되는 경향을 보였다. 해석결과로부터 노치 길이 및 개구 폭에 따른 응력집중계수의 변화 및 균열발생 양상을 비교 분석하여 균열제어에 미치는 영향인자에 대하여 고찰하였다. Crack-controlled blasting method which utilizes notched charge hole has been proposed in order to achieve smooth fracture plane and minimize the excavation damage zone. In this study, the blast models, which have a notched charge hole, were analyzed using dynamic fracture process analysis software to investigate the effect of the geometry of a notched charge hole and decoupling indexes of the charge hole on crack growth control in blasting. As a result, crack extension increased and damage crack decreased with the notch length. Ultimately, stress increment factors and resultant fracture patterns with different notch length and width were analyzed in order to examine the effect factors on the crack growth controlling in rock blasts using a notched charge hole.