양자점 레이저 다이오드의 식각 깊이에 따른 접합온도 측정

정정화,한일기,이정일,Jeong, Jung-Hwa,Han, Il-Ki,Lee, Jung-Il 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.6

순방향 전압-온도 (forward voltage-temperature)법을 이용하여 양자점 레이저 다이오드의 접합온도를 측정하였다. 식각 깊이가 깊은 mesa 구조의 경우 입력전류에 대한 접합온도의 증가율은 0.05 K/mA인 반면, 식각 깊이가 낮은 mesa 구조의 경우 0.07 K/mA로서 상대적으로 높게 측정되었다. 깊은 mesa 구조에서의 상대적으로 낮은 접합온도 증가율은 mesa 측면 방향으로의 열확산 효과 때문인 것으로 설명된다. Junction temperature of quantum dot laser diodes is investigated by utilizing forward voltage-temperature method. In the case of ridge type laser diodes with deep mesa the increasing rate of junction temperature to current is about 0.05 K/mA, while in the case of shallow mesa the increasing rate is about 0.07 K/mA. It is explained that the relatively low increasing rate in the deep mesa results from the heat expansion to the lateral direction of mesa.

일부 치위생과 학생들의 윤리적 직무행동 수준에 관한 연구

정정화(Jung-Hwa Jung),우희선(Hee-sun Woo) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.6

The purpose of this study was to find the ethical values of dental hygiene students, to establish the right ethical values of the students, and to provide a fundamental material for the ethical education direction and curriculum of the students. In order to examine the general characteristics and ethical job behavior level among dental hygiene students, a research was conducted from 1st April 2017 to 30<SUP>th</SUP> June 2017 through selecting freshman, sophomore, junior and senior students currently enrolled in the department of dental hygiene at 5 different colleges as the subjects. Statistical analysis was performed using IBM SPSS 22. The frequency analysis was used to examine their general characteristics. The independent t-test was used to examine their ethical job behavior according to their religion, hospital practice experience and code of ethics as a dental hygienist, and the one-way ANOVA was used to examine their ethical job behavior according to grade-specific characteristics. Lastly, the Scheffe’s post hoc test was conducted. The significance level was 0.05. Given the results, ethical job behavior was significantly different between the group of students with religion, the group of students with hospital practice experience, different school year students, and the group of students aware of code of ethics as a dental hygienist.

Graph 분할에 의한 고밀도 PLA설계법

정정화(Jung Hwa Jung),노승룡(Sung Ryong Ro),이영보(Young Bo Lee) 한국정보과학회 1982 정보과학회논문지 Vol.9 No.4

본 논문에서는 PLA외 chip이용율을 높이기 위하여 입력변수와 출력변수 각각을 분할하여 array의 양측에 할당할 수 있는 고밀도 PLA외 설계법을 제안한다. 변수를 분할하기 위하여 논리함수로부터 무향 Graph G=(V,E)를 도입한다. 여기서 V는 변수에 대응하는 절점이며 집합이며 E는 임의의 minterm내에 존재하는 변수의 쌍에 대응하는 edge의 집합이다. 고밀도 PLA의 특성을 만족하고 분할된 두 변수의 집합사이의 연결을 최소로 하기 위하여 선택함수 S를 설정한다. 또한 본 논문에서 제안한 Algorithm의 time complexity는 O(MAX(n², n×ℓ)로 됨을 보인다. This paper presents a new heuristic algorithm to improve a utility factor for the chip of PLA with partitioning the inputs and outputs, respectively, and assigning them on both sides of the arrays in HPLA, To partition the variables, based on the undirected graph G=(V,E) through the logic function, is proposed. Here, V is a set of vertex corresponding to variables and E is a set of edge corresponding to a pair of variables in any minterm. This paper deals with a selection function is to satisfy the property of HPLA and minimize the connection of partitioned two variable sets. It shows that the time complexity of this algorithm is O (MAX(n², n×ℓ)).

집중 치료적 중재에 따른 뇌성마비 아동들의 기능적 독립성 변화

정정화 ( Jung Hwa Jung ),정혁 ( Hyuk Chung ) 한국특수체육학회 2015 한국특수체육학회지 Vol.23 No.4

이 연구에서는 뇌성마비 아동들에게 적용된 집중 치료적 중재가 대상자들의 기능적 독립성에 어떠한 영향을 미치는지 규명하고자 하였다. A광역시에 소재한 재활전문병원 집중 재활치료에 참가한 아동들 중독립보행이 가능한 26명(남아 16명; 여아 10명)으로부터 수집된 자료를 분석하였다. 평균 치료기간은 9.58주였으며 대상자들의 평균 연령은 65.08개월(SD=37.55)이었다. 아동들의 기능적 독립성을 평가하는 6개 항목 중 ‘장소 옮기기’와 ‘사회적 인지’에서는 치료 전후 사이에 차이가 없었던 반면, ‘신변처리’, ‘대소변조절’, ‘이동하기’, 그리고 ‘의사소통’과 관련된 독립성이 유의하게 향상된 것으로 나타났다. 추가로 집중치료 후 보호자가 판단하는 아동의 독립성 수준을 조사하여 그 결과를 제시하였다. The primary concern of this study was to examine the effect of intensive therapeutic intervention on the functional independence of children with cerebral palsy. The data from 26 children (16 boys and 10 girls) were used for this study after excluding children who could not walk independently rather relied on a wheelchair or a crutch. The average period of the therapy was 9.58 weeks and the average age of children was 65.08 months (SD=37.55). The significant differences were found on ‘Self-Care’, ‘Sphincter-Control’, ‘Locomotion’, and ‘Communication’ factors while changes in ‘Mobility-Transfer’ and ‘Social-Cognition’ were not significant. In addition, the guardians’ attitude to the therapy and the recognition levels on the functional independence of their children were provided.

미디어 나르시즘: 앤디워홀과 빅브라더

정정화 ( Jung Hwa Jung ) 한국기초조형학회 2006 기초조형학연구 Vol.7 No.3

농촌지역 다문화가정 아동과 부모의 문화적응이 아동의 자아존중감에 미치는 영향

정정화(Jung-Hwa Jung),이강이(Kang-Yi Lee) 한국아동학회 2014 아동학회지 Vol.35 No.6

This study was conducted with the aim of examining the acculturation process of children and parents from multicultural families, which can affect the self-esteem of the children concerned. The participants from each family consisted of the fathers, mothers, and school-age children of 179 households. The results of this study reveal the following: (1) First, the multicultural children scored higher than the average in self-esteem in most areas except school life. Furthermore, the children and parents had a comparatively positive attitude toward acculturation (2) Second, the children`s level of self-esteem had significant correlations only with the acculturation of mothers as opposed to fathers. (3) Third, the impacts of acculturation of the children and their parents on the children`s self-esteem followed different patterns according to the sub-areas of self-esteem. Specifically, the self-esteem for overall self-value and family relations rose when the multicultural acceptance attitude of mothers was high. However, area of peer relations was affected only by the acculturation of children. The area concerning school life was high when the mother-culture propagation attitude of mothers was low.

공동주택 지하주차장의 자연환기성능 향상방안에 관한 연구

서정민(Jung-Min Seo),이중훈(Joong-Hoon Lee),송종의(Jong-Eui Song),정정화(Jung-Hwa Jung),송두삼(Doo-Sam Song) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.2

Energy efficiency and indoor air quality have become main issue to develop healthy and sustainable building in these days. As an effort to reduce the energy consumption in multiresidential building, many attempts as like passive design strategies and renewable energy as well as active control method are tried. However, underground parking lot in multi-residential building seldom adopt the sustainable strategies and only mechanical system is installed as usual. Moreover, the mechanical system installed in underground parking lot is rarely operated due to the electric demand for operation after completion. In this study, as an energy efficient measure, natural ventilation system using stack effect as a driving force for underground parking lot will be proposed and the performance of the suggested system will be analyzed by simulation method.

혈액투석 환자에서 갑상선 초음파의 추적

김현정 ( Hyun-jung Kim ),김보라 ( Bo Ra Kim ),서영미 ( Yeong-mi Seo ),조윤영 ( Yoon Young Cho ),백종하 ( Jong-ha Baek ),김경영 ( Kyong Young Kim ),김수경 ( Soo-kyung Kim ),우승훈 ( Seung-hoon Woo ),정정화 ( Jung Hwa Jung ),정재훈 영남대학교 의과대학 2017 Yeungnam University Journal of Medicine Vol.34 No.1

Background: Chronic kidney disease is considered a risk factor for thyroid nodules as well as thyroid dys-function such as hypothyroidism. Among patients on hemodialysis, we assessed the size of thyroid nodule and goiter at baseline and 1 year later with ultrasonography. Methods: We prospectively selected 47 patients with hemodialysis at January 2012 and reviewed their medical records. We checked goiter and thyroid nodules at January 2012 and December 2012. Results: In the hemodialysis patients (n=47), 24 patients (51.1%) had thyroid nodules and 33 patients (70.2%) had goiter at baseline. Parathyroid hormone (PTH) was higher in patients with thyroid nodules (204.4±102.9 vs. 129.9±93.6 pg/mL, p=0.01). Thyroid ultrasonography was conducted in 29 patients after 1 year. The thick-ness of the thyroid isthmus increased (2.8±1.6 vs. 3.2±1.9 mm, p=0.003), but the number of nodules did not change (1.2±1.9 vs. 1.4±2.0, p=0.109). PTH was associated with the enlargement of thyroid nodules signi-ficantly through logistic regression analysis. Conclusion: Thyroid goiter and nodules in hemodialysis patients were more prevalent than in the general population. PTH influenced the production of thyroid nodules in hemodialysis patients. Regular examination with thyroid ultrasonography and thyroid function test should be considered in hemodialysis patients.

서남해안(西南海岸) 간석지토양(干潟地土壤)의 특성(特性)에 관(關)한 조사연구(調査硏究)

심재환,정정화,안열,Shim, Jae-Hwan,Jung, Jung-Hwa,An, Yeul 한국토양비료학회 1989 한국토양비료학회지 Vol.22 No.4

서남해안(西南海岸)에 분포(分布)되어 있는 간척가능지(干拓可能地) 442,000ha에 대(對)한 토성별(土性別) 분포현황(分布現況)과 물리화학적(物理化學的) 특성(特性)을 조사(調査) 분석(分析)하고 토양(土壤) 성숙(成熟)에 따라 일어나는 상상(像想) 침하량(沈下量)에 대(對)하여 연구(硏究)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 기존간척지(旣存干拓地) 257,000ha의 토성별(土性別) 분포면적(分布面積)은 미사식양질(微砂埴壤質) 53.0%, 미사사양질(微砂砂壤質) 36.0%, 사질(砂質) 6.0%, 사양질(砂壤質) 5.0% 이다. 2. 간척가능지(干拓可能地) 442,000ha의 토성별(土性別) 분포면적(分布面積)은 미사식양질(微砂埴壤質) 51.0%, 사질(砂質) 20.0%, 사양질(砂壤質) 15.0%, 징사식양질(徵砂埴壤質) 14.0%이며 지역별(地域別) 분포(分布)는 경기(京機)와 전남(全南)은 미사질계토양(微砂質系土壤), 전북(全北)은 조립질토양(粗粒質土壤), 충남지역(忠南地域)은 각종토성(各種土性)이 고르게 분포(分布)되어 있다. 3. 간척가능지토양(干拓可能地土壤)은 염도(鹽度)(EC) 46~51mmhos/cm, E.S.P 25~60%, pH 7.5~8.0으로 U.S.Salinity Lab의 염류토양(鹽類土壤) 분류(分類)로 함염(含鹽)Alkali토와(土) 유사(類似)하다. 4. 간척가능지(干拓可能地)를 농경지(農耕地)로 개발(開發)할때 예상(豫想)되는 침하량(沈下量)은 미사질양토(微砂質壤土) 18.0%, 치사질식양토(徵砂質埴壤土) 21.0%이다. The soil texture and the physico-chemical characteristics of 442,000ha reclaimable tide land in the south-western of korean peninsular were analysed. The subsidence which may occur as the soil ripened was studied. The results were as follows : 1. Among the 257,000ha of existing reclaimed tidal land 53.0% was tine silty soil and 36.0% coarse silty, 6.0% coarse loamy and 5.0% sandy soils, respectively. 2. Out of the total 442,000ha of reclaimable tidal land, 51.0% was coarse silty soil, and 20% sandy, 15.0% coarse loamy and 14.0% fine silty textural family, respectively. The coarse silty deposits were mainly distributed in the Gyeong gi and Jeonnam coast, while the coarse deposits(Coarse Loamy-sandy) exist in the Jeonbuk coastal area, but in the Chungnam areas there were various textural grades. 3. Reclaimable tidal Land in the south-western part of the peninsular was Classified into saline and alkaline soil. Electric Conductivity in saturation extract was extremely high that was 46~51 mmhos/cm, E.S.P was more than 25% and pH was ranged around 7.5~8.0 4. Reclaimed to cultivated field the subsidence reclaimable tide land to be expected when was about 18% in Soil and 21% in Sicl soils calculated down to 1.25m of the profile.

포토캡션을 정보를 이용한 이미지 검색 시스템의 설계 및 구현

정민화(Min-Hwa Jung),한기태(Ki-Tae Han),유광석(Kwang-Seok Ryoo),서창덕(Chang-Duck Suh),정정화(Jong-Wha Chong) 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.11