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.

TSP알고리즘을 이용한 택배도착시간 관리에 관한 연구

박승환,김봉근,고윤환 대한산업공학회 2005 대한산업공학회 추계학술대회논문집 Vol.2005 No.-

내분비-대사 : 제 2형 당뇨병 환자에서 알부민뇨와 말초동맥질환과의 관계 (초)

박승환,정진욱,조동혁,정동진,정민영 대한내과학회 2010 대한내과학회 추계학술대회 Vol.2010 No.-

Support Vector Machine-Regression을 이용한 주기신호의 이상탐지에 관한 연구

박승환,김준석,김성식,백준걸 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.10

본 연구는 Support Vector Machine-Regression(이하 SVM-R)을 이용하여 반도체 공정에서 측정되는 주기신호(Cyclic Signals)의 이상 탐지(Fault Detection)를 목적으로 한다. 주기신호란 한 공정 주기 동안 시간에 따라 특정한 패턴을 형성하는 신호를 말한다. 이러한 주기신호의 이상탐지를 위해서 SPC(Statistical Process Control) 차트를 적용하게 되면 2가지 문제점이 존재한다. 첫째, 기존의 SPC 차트들은 공정에서 측정되는 비주기신호의 평균과 분산을 관리하기 위하여, 정상신호는 고정된 평균과 균일한 분산을 가지는 정규분포를 따른다는 가정으로부터 유도되었다. 그러나 주기신호는 시간에 따라 이동하는 평균과 균일하지 않는 분산을 가지는 특정할 수 없는 분포를 따른다는 문제점이 있다. 둘째, 주기신호를 SPC 차트에 적용하기 위하여 주기신호의 구간을 나누는 방법이 제안되었으나 구간의 길이를 결정하는 문제 및 신호의 변동이 큰 구간에서 분산이 증가하는 등의 문제를 가지고 있다. 이러한 문제를 해결하기 위하여 본 연구에서는 주기신호의 시간에 따른 모습을 평균과 분산에 대한 식으로 표현하고, 정상 상태의 주기신호에 대한 평균을 나타내는 함수를 추정하기 위하여 비선형 regression 기법인 SVM-R을 이용한다. 또한 SVM-R을 사용하여 구축된 중심선을 기준으로 분산을 나타내는 함수를 추정하여 관리한계선을 설정하고 이를 바탕으로 주기신호의 이상 여부를 판단한다. 제안된 방법의 이상탐지 성능 평가를 위하여 기존의 구간을 나누는 SPC 차트와의 비교 실험을 수행한다.

⟪아버지의 손길⟫작품론

박승환,신성균 한국사진학회 2022 AURA Vol.- No.49

Abstract Human memories, which gradually fade over time, are stored in the abyss of the unconscious and rise to the surface of consciousness through specific stimuli, allowing them to have some form of emotion or sentiment again. Park Seung-hwan came up with the photo series <The Father's Touch> out of a very personal motive and longing for his father, who passed away a long time ago. He wanted to feel the presence of his father, which was closer to him than anyone else but was gradually forgotten as the years passed. To put his feelings in the objects through photographic images, Park started looking for things that his father frequently used in his daily life while he was alive; unfortunately, a notepad was the only thing remained. After thinking hard about any possible method, he searched for similar items and bought them at the second-hand market to make some experimental images. From this preliminary work process, Park discovered the possibility of utilizing such similar objects for reminding of his father, regardless of whether his father once used them or not. He gained confidence while studying the art theory and philosophy related to his approach and expected some sympathy from the viewers by directing them to their fathers in their unconscious.

노치 형상과 장약밀도 변화에 따른 균열 전파 양상에 관한 수치 해석적 연구

박승환,조상호,김승곤,김동규,김광염 한국암반공학회 2009 한국암반공학회 학술대회 및 세미나 자료집 Vol.2009 No.-

Quantum-confined Stark Effects of Strained CdTe/ZnTe Pyramidal Quantum Dots

박승환,홍우표,김종재 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4

The optical transition energy and the optical matrix element of strained CdTe/ZnTe pyramidal quantum dots (QDs) were theoretically studied using an eight-band strain-dependent k·p Hamiltonian. We note that the transition energies have redshifts for an electric field along the growth direction. However, the redshift of the transition energies is slightly reduced when the electric field is applied in a direction opposite the growth direction. For a given electric field, the redshift of thetransition energy increases with increasing θ and is shown to be symmetric with respect to θ = π/2. The optical matrix elements for y- and z-polarizations are shown to be asymmetric with respect to θ = π/2. In the case of the z-polarization, on the other hand, the optical matrix element shows a saddle shape.

IoT 기반 화재탐지시스템의 연기 및 온도감지기 비화재보 신호 패턴 분석

박승환,김두현,김성철,Park, Seunghwan,Kim, Doo-Hyun,Kim, Sung-Chul 한국안전학회 2022 한국안전학회지 Vol.37 No.2

Fire-alarm systems are safety equipment that facilitate rapid evacuation and early suppression in case of fire. It is highly desirable that fire-alarm systems have low false-alarm rates and are thus reliable. Until now, researchers have attempted to improve detector performance by applying new technologies such as IoT. To this end, IoT-based fire-detection systems have been developed. However, due to scarcity of large-scale operational data, researchers have barely studied malfunctioning in fire-alarm systems or attempted to reduce false-alarm rates in these systems. In this study, we analyzed false-alarm rates of smoke/temperature detectors and unwanted fire-alarm signal patterns at K institution, where Korea's largest IoT-based fire-detection system operates. After analyzing the fire alarm occurrences at the institution for five years, we inferred that the IoT-based fire-detection system showed lower false-alarm rates compared to the automatic fire-detection equipment. We analyzed the detection pattern by dividing it into two parts: normal operation and unwanted fire alarms. When a specific signal pattern was filtered out, the false-alarm rate was reduced to 66.9% in the smoke detector and to 46.9% in the temperature detector.

마이닝 마인즈 플랫폼용 헬스케어 서비스를 위한 사용자 관점의 UX 연구

박승환,최재현,박태주 한국경영과학회 2016 한국경영과학회 학술대회논문집 Vol.2016 No.4

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.