예측소음도와 설문결과를 이용한 철도소음 노출-반응 모델

손진희(Son, Jin-Hee),이건(Lee, Kun),장서일(Chang, Seo-Il) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.5

The suggested method of previous Son's study dichotomized subjective response data to modeling noise exposure-response. The method used maximum liklihood estimation instead of least square estimation and the noise exposure-response curve of the study was logistic regression analysis result. The method was originated to modeling community response rate such as %HA or %A. It can be useful when the subjective response was investigated based on predicted noise level. It is difficult to measure the single source emitting noise such as railway because various traffic noise sources combined in our life. The suggested method was adopted to model in this study and railway noise-exposure response curves were modeled because the noise level of this area was predicted data. The data of this study was used by previous Ko's paper but he dealt the area as combined noise area and divided the data by dominant noise source. But this study used all data of this area because the annoyance response to railway noise was higher than other noise according to the result of correlation analysis. The trend of the %HA and %A prediction model to train noise of this study is almost same as the model based on measured noise of previous Lim's study although the investigated areas and methods were different.

일괄공정 압저항혈 압력센서의 특성

서희돈,이동원,손미정,최세곤 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.1

This paper describes structural characteristics of three kinds of piezoresistive pressure sensors, which include wheatstone-bridge type, center-boss type and single-element type, fabricated on one-chip by batch process. In order to optimize device dimensions with respect to the desired characteristics, analytical formula and finited-element modeling(FEM) are used in design process. In experiments the pressure sensitivity of wheatstone-bridge type is about 2.2㎷/V·㎪. The fabricated center-boss pressure sensor has improved in the characteristics as linearity at low pressure, and sensitivity is about 2.415㎷/V·㎪. In single-element type with a four-terminal gauge using shear stress, the maximum sensitivity about 0.4㎷/V·㎪ appeared at the center of the diaphragm with the 3:1 of the length : width ratio. this type is very appropriate method to minimize the temperature dependance of the offset voltage and sensitivity, because the fabricated sensors reduce the offset of themal stress and mismatch of piezoresistros as compared with the wheatstone-bridge type.

고감도 에어백용 실리콘 가속도센서의 설계

손미정,김경기,서희돈,최세곤 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1

This paper presents the high sensitivity silicon piezoresitive accelerometer for possible use in an automotive airbag system. Two basic types of silicon piezoresitive accelerometers(bridge-type and cantilever-type)have some problems in the sensitivity and resonance frequency. The bridge-type has high resonance frequency and low sensitivity, but the cantilever-type has everse property. in order to improve the properties of the silicon piezoresistive accelerometer, we propose a new type of silicon accelerometer that have three beams. The proposed structure is that two beams are located at the each comer of the right side, and the other is at center of the left side. The optimized overallsize of the new type accelerometer is more smaller than two basic types of accelerometer. In the simulated reselts using analytical formelae and finite-element modeling(FEM), It's maximum stress is 26MPa and resonance frequency is 3250Hz for 50 G acceleration, respectively. The proposed structure is expected to be applied to much wider use automotive airbag application than the other structures.

전신성 홍반성 루푸스에서 F-18 FDG PET상 기저핵 포도당대사 증가 소견을 보이는 무도병 1예 : Evidence for Bilateral Putaminal Hypermetabolism on F-18 FDG PET

서욱장,정선미,고수진,이창근,김재승,임주혁,유빈,문희범 대한핵의학회 2003 핵의학 분자영상 Vol.37 No.5

Purpose: We describe a 54-year-old woman with systemic lupus erythematosus (SLE) who suddenly presented with chorea and had positive antiphospholipid antibodies. F-18 FDG PET showed abnormally increased glucose metabolism in bilateral putamen and primary motor cotex. Tc-99m ECD SPECt also showed abnormally increased regional cerebral blood flow in bilateral putamen. She was treated with corticosteroid and aspirin after which the symptoms improved. Four months later, follow up F-18 FDG PET showed improvement with resolution of hypermetabolism in bilateral putamen. This case suggests that striatal hypermetabolism is associated with chorea in SLE.

개에서 피지선 과형성의 진단 및 치료 증례

박희서,손화영,정성목,송근호,조종기,이영원,신상태,김명철,김덕환,박성준 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

An eleven year old castrated male Maltese was presented to the Veterinary Medical Teaching Hospital of Chungnam National University. In physical examination, approximately 0.5 cm round mass was observed on tail base. This small elevated mass has also shown alopecic and firm configuration. It was differentially diagnosed as sebaceous adenoma and hyperplasia by fine needle aspiration. After surgical removal, the sample was diagnosed as sebaceous hyperplasia by histopathological examination. It has not yet shown any signs of recurrence and prognosis has teen good.

생체신호처리용 ASIC 칩 개발

배용욱,박차훈,서희돈,최세곤 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

The biotelemetry system transmits monitored physiological signal from multiple subjects to an electrical instrument at remote place where this information can be observed via electrical or optical link. In this paper, we developed an optical linked telemetry system which can transmit 6-channel physiological signals from 4 subjects, simultaneously. The proposed telemetry system is fabricated with Altera FPGA chip(EPM7128LC84-20) and 0.8μm CMOS n-well process technology. We designed a All-Digital PLL to synchronize with the external measurement system which consisted of a command signal transmitter and a telemetry signal demodulator. The operation characteristic of a All-Digital PLL is superior than an enforced synchronization oscillator which consisted of negative elements and a comparator. The required time to synchronize with a external measurement system at the maximum phase error is about 10.3ms. The novel external measurement system is implemented with Altera FPGA chip (EFM7096LC84-15).

Decomposition of volatile fatty acids using electron beam irradiation

Seo, Seo Hee,Park, Jun-Hyeong,Kim, KyeongMok,Kim, Tak-Hyun,Kim, Hyun Woo,Son, Youn-Suk Elsevier 2019 Chemical engineering journal Vol.360 No.-

<P><B>Abstract</B></P> <P>Volatile fatty acids (VFAs) are representative odorous compounds. This study was carried out to decompose VFAs using electron beam irradiation. Acetic acid, propionic acid, butyric acid, isovaleric acid, and valeric acid were used as target VFAs. In order to confirm the decomposition efficiency and characteristics by various influential factors, experiments on the absorbed dose, background gas, and initial concentration were performed. The results confirmed that the removal efficiency increased with an increase of the absorbed dose. In addition, the removal efficiency was increased with an increase of the molecular weight of these compounds (in the following order: acetic acid < propionic acid < butyric acid < isovaleric acid < valeric acid). The removal efficiencies of all target VFAs were highest when used with O<SUB>2</SUB> as a background gas. We found the lowest removal efficiency at the He atmosphere. The results of by-product analysis confirmed that valeric acid was decomposed into butyric acid and propionic acid, and then decomposed into acetic acid. That is, high molecular weight acids would be decomposed into low molecular weight acids by electron beam irradiation.</P> <P><B>Highlight</B></P> <P> <UL> <LI> An electron beam was used to decompose volatile fatty acids (VFAs). </LI> <LI> Decomposition characteristics by various influential factors were investigated. </LI> <LI> The removal efficiency was increased with an increase of the molecular weight of these compounds. </LI> <LI> The RE of all target VFAs were highest when used with O<SUB>2</SUB> as a background gas. </LI> <LI> Valeric acid was decomposed to more low molecular weight acids by electron beam irradiation. </LI> </UL> </P>

Korean Divorced Mothers` Experiences with Child Support from Noncustodial Fathers

( Seo Hee Son ) 대한가정학회 2014 International Journal of Human Ecology Vol.15 No.1

The purpose of this study was to explore Korean divorced mothers’ experiences with child support. The data were collected from 17 Korean divorced mothers who were divorced between the years of 2004 and 2009 and were raising at least one minor child. Data were analyzed based on the inductive data analysis method. Most mothers negotiated to receive child support from noncustodial fathers without experiencing much conflict with the fathers at the time of the divorce, but only five mothers received child support at the time of the interviews. The mothers experienced difficulties in receiving child support from the fathers under the child support policy in Korea that treated child support as a personal issue and provided little systemic support for child support. Regarding required parenting agreements, most of the mothers acknowledged the need to have parenting agreements but they still wanted voluntary payment of the child support from the fathers. The results suggest that it is necessary to expand parenting education for divorced parents to encourage voluntary participation in parenting and to improve the child support policy by introducing child support guidelines and enhancing child support collection systems.

Connecting Program Evaluation Strategies with the Program Life Cycle: Implications for Family Development Programs

( Seo Hee Son ),( Mary S. Marczak ) 대한가정학회 2010 International Journal of Human Ecology Vol.11 No.1

Family professionals and family program staff need to consider the importance of program evaluation in Korea since an increasing number of Healthy Family Support Centers are providing diverse intervention and education programs. The purpose of this research paper is to (a) introduce a program evaluation model that includes the program life cycle; (b) help family professionals and family program staff understand the link between program implementation and evaluation processes; and (c) facilitate discussions in terms of program evaluation of Healthy Family Support Centers and evaluation roles of different levels of Healthy Family Support Centers including the headquarters, regional, and local centers. Understanding the program life cycle and relevant evaluation processes will help family professionals and family program staff be more strategic in answering critical questions about a program`s effectiveness. The benefits of program evaluation and its implications are discussed.

Barriers to Employment Among Low-Income Mothers in Rural United States Communities

Son, Seo-Hee,Dyk, Patricia Hyjer,Bauer, Jean W.,Katras, Mary Jo The Korean Home Economics Association 2011 International Journal of Human Ecology Vol.12 No.1

This article addresses potential barriers to sustained employment for rural low-income mothers. Drawing from a two panel longitudinal sample of 240 families from the Rural Families Speak project, it examines the extent to which human capital and family factors were related to these mothers' ability to be employed. Comparisons are made between mothers, who over a three-year period, were continuously unemployed, intermittently employed, or stably employed. Many of these rural low-income mothers faced multiple individual and family barriers that impacted their labor force participation. Notably food insecurity, mental health, caring for a young child, housing, and a family history of welfare were associated with less stable employment. The implications for public policy and service delivery are discussed.