Electrical Characteristics of AlxGa1-xN/GaN Heterostructure withIsoelectronic Al-Doped Channel for HFET Application

이정희,Jae-Hee Park,Jae-Hoon Lee,Jae-Seung Lee,Jong-Wook Kim,Kye-Seok Lee,Sung-Bum Bae,Sung-Ho Hahm 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III

Based on investigating the effects of isoelectronic Al-doping on GaN film, a new layer structure is proposed for a heterostructure field effect transistor (HFET) including an isoelectronic Al-doped channel. The electron mobility measured at 77 (300) K significantly increased from 145 (130) cm$^2$/V$\cdot$s in the undoped sample to 823 (440) cm$^2$/V$\cdot$s in the Al-doped sample grown with a trimethylaluminum flow rate of 3 $\mu$mol /min, while maintaining the background doping concentration below $\sim$ 6 $\times$ 10$^{16}$ cm$^{-3}$. Two-dimensional electron gas mobilities of 1690 and 9280 cm$^2$/Vs were measured for a 25-nm Al$_{0.3}$Ga$_{0.7}$N/1-nm AlN/70-nm Al-doped channel/GaN heterostucture at 300 and 77 K, respectively. The improved results are explained based on a decrease in the compensating acceptors or other defects associated with the formation of screw dislocation due to the incorporation of Al in the channel layer, plus a decrease in the alloy disorder scattering in the heterostructure based on introducing a binary thin AlN layer between the Al$_{0.3}$Ga$_{0.7}$N and Al-doped channel layers.

세계화와 상호공존의 시민정신: 하퍼 리의 『앵무새 죽이기』

이정희 ( Chung Hee Lee ) 한국현대영미소설학회 2004 현대영미소설 Vol.11 No.1

통증완화를 위해 비파엽 찜질을 병행한 암환자 6례에 대한 증례보고

이정희,장보형,권혁성,권오섭,Lee Jung-Hee,Jang Bo-Hyoung,Kweon Hyug-Sung,Kweon O-Seob 대한한방내과학회 2003 大韓韓方內科學會誌 Vol.24 No.4

Objective: The purpose of this study is to see whether pain in cancer patients is decreased by Eriobotryae Folium Fomentation. Methods: We examined the change in pain among six cancer patients, prescribing Eriobotryae Folium Fomentation. As for evaluating methods, we used the case history of pain, the direct evaluation of pain, the indirect evaluation of pain. The direct evaluation of pain is subdivided by the language expression, the non-language expression, and Visual analog scale(VAS). The indirect evaluation of pain is subdivided by the condition of walking, mood and the condition of sleep. Results: After two weeks, any remarkable pain decrease is not observed in both of the direct evaluation and indirect evaluation.

논문편 : 대전지역 저소득층 주거환경의 질적인 개선에 관한 연구

이정희,김선균,최목화 ( Jeung Hee Lee,Seon Kyun Kim,Mock Wha Choi ) 대한가정학회 1990 Human Ecology Research(HER) Vol.28 No.2

펩타이드 함유 화장품의 속눈썹 상태변화 연구

이정희,Lee, Jung-Hee 중소기업융합학회 2020 융합정보논문지 Vol.10 No.11

본 연구는 펩타이드 함유 화장품이 속눈썹 미용법으로서의 효능을 검증해 보고자 하였다. 연구대상은 20세 여성 21명을 대상으로 실험군(오른쪽 속눈썹)과 대조군(왼쪽 속눈썹)으로 설정하여 4주간 펩타이드 화장품의 사용에 따른 변화 측정을 진행하였다. 분석결과, 속눈썹의 길이와 밀도 변화는 집단과 실험기간 간의 상호작용, 각 실험기간에 따른 주 효과에서 유의한 차이가 있는 것으로 나타났다(p<.001). 속눈썹의 밀도와 두께 변화에서는 측정 시기별 집단 간 차이에서 3주차와 4주차에서 유의미한 차이가 있는 것으로 나타났다(p>.05, p>.01). 펩타이드를 함유한 화장품은 미용적 시술에 의한 부작용을 고민하는 사람들에게 속눈썹의 길이와 수적인 증가로 안전하고 아름다운 속눈썹을 위한 효과적인 미용방법임을 효과적으로 입증하였다. 이에 향 후 다양한 연령층으로 확대된 연구의 진행을 기대한다. The purpose of this study was to verify the efficacy of cosmetics containing peptides as a cosmetic method for eyelashes. The study subjects were 21 women aged 20 years, set as the experimental group (right eyelash) and the control group (left eyelash), and measured changes according to the use of peptide cosmetics for 4 weeks. As a result of the analysis, the change in the length and density of eyelashes showed significant differences in the interaction between the group and the experiment period, and in the main effect according to each experiment period (p<.001). In the change of eyelash density and thickness, it was found that there was a significant difference at week 3 and week 4 in the difference between groups by measurement period (p>.05, p>.01). Cosmetics containing peptides have been effectively proven to be an effective cosmetic method for safe and beautiful eyelashes by increasing the length and number of eyelashes to those who suffer from side effects caused by cosmetic procedures. In the future, we look forward to expanding research to a wide range of age groups.

국내 쯔쯔가무시증의 감염자 분포와 유병자수 추정

이정희,박정수,Lee, Jung-Hee,Murshed, Sharwar,Park, Jeong-Soo 한국데이터정보과학회 2009 한국데이터정보과학회지 Vol.20 No.1

쯔쯔가무시증은 가을철 유행성 출혈열 중 80%이상을 차지하는 질병으로 1주에서 2주의 잠복기를 가지는 것으로 알려져 있다. 우리는 그 잠복기간의 확률분포가 감마분포라 가정하고 후향연산식을 이용하여, ${\hat{\mu}}=309.92$$, ${\hat{\sigma}}=14.154$인 정규분포를 따르는 감염자 분포를 추정하였다. 감염자는 10월에 집중적으로 분포하는 것으로 나타났다. 이러한 감염자 분포형태는 발병자 수가 11월동안 급격하게 증가하는 것에 기인한다. 본 연구에서 추정한 감염확률에 의해 미래의 유병자수를 계산한 결과 최대 1200명이었고 이는 매년 증가하는 발병자 수의 경향을 반영하지 못한 한계가 있다. 또한 우리는 전염병 모형으로 잘 알려져 있고 전염발전 단계간의 상호작용을 고려하는 SIRS 모형을 적용해 보았다. 모수는 초기값으로부터 잘 근사되어 수렴하는 값으로 추정하였다. Tsutsugamushi fever occupies more than 80% of total fall epidemic diseases and has an incubation period of 1 or 2 weeks as well. We have assumed that the incubation period distribution is gamma and therefore, reach an agreement that the infected distribution is normal with ${\hat{\mu}}=309.92$, ${\hat{\sigma}}=14.154$ by back calculation method. The infection cases are found severely large around the month of October. The infection case distribution demonstrates the incidence number increasing rapidly and progresses fast during the month of November. In this study, we have calculated the future prevalence number of maximum 1,200 people by inferred infection probability and incubation period distribution with some sort of limitation that the trend of increasing incidence number is not taking into an account. We considered the SIRS model which is also known as epidemic model, familiar to interaction between epidemiological classes. Our estimated parameters converged well with the initial parameter values.

선천성 낭종성 기형의 외과적치료;1례 보고

이정희,임진수,최형호,Lee, Jeong-Hui,Im, Jin-Su,Choe, Hyeong-Ho 대한흉부심장혈관외과학회 1993 Journal of Chest Surgery (J Chest Surg) Vol.26 No.4

Congenital cystic adenomatoid malformation [CCAM] of the lung is extremely rare. The patient was 10 year old female and had no specipic signs and symptoms except right lower chest pain for 5 days ago before admission.On simple chest X-ray and thoracic CT scan, about 9x8x8cm sized, heterogenous marginal enhanced multiseparated hypodence lesion with air fluid level and gas bubbles in posterior pleural space in right lower chest .The culture result of needle aspiration of cavity was apergillus flavus. Right lower lobectomy was carried out and the result of biopsy was congenital cystic adenomatoid malformation.

흉막액의 임상적 고찰

이정희,임진수,Lee, Jeong-Hui,Im, Jin-Su 대한흉부심장혈관외과학회 1993 Journal of Chest Surgery (J Chest Surg) Vol.26 No.5

A clinical analysis of pleural effusion was done on 100 patients who were between 5 and 67 years old. The etiologic diagnosis of pleural effusion at the time of discharge were pulmonary tuberculosis in 38 cases[38%],pneumonia in 20 cases[20%],lung carcinoma in 16 cases[16%],liver cirrosis in 9 cases[9%],congestive heart failure in 4 cases[4%],nephrosis in 3 cases[3%],Meig,s syndrom in 3 cases[3%].liver abscess 2 cases[2%],pancreatitis in 1 cases[1%] and other metastatic malignancy in 4 cases[4%]. Their chief complaints was chest pain in 89 cases[89%],dyspnea in 74 cases[74%],coughing in 46 cases[46%], fever in 13 cases[13%],weakness in 12 cases[12%] and dizziness in 11 cases[11%].

치매의 원인과 증상

이정희,Lee, Jeong-Hui 한국건강관리협회 1995 건강소식 Vol.19 No.3

직류전위차법 자료에 대한 통계적 자료분석

이정희,이우동,Lee, Jeong-Hee,Lee, Woo-Dong 한국데이터정보과학회 2010 한국데이터정보과학회지 Vol.21 No.1

비파괴검사방법 중 직류전위차법은 표면균열 측정에 유효한 수단으로 알려져 있다. 이차원 표면 균열을 가진 시험편에서 전류입출력점사이의 거리가 직류전위차에 미치는 영향을 알아보는 실험을 실시하여 자료를 얻었다. 이 자료로부터 전위차 값은 일정 전위차계측점사이의 거리에 있어 전류입출력점사이의 거리가 증가함에 따라 반비례적으로 감소하고, 노치의 길이에 비례하고 있었다. 이 실험에서 관찰된 자료를 통계적 모형에 적합시키고, 적합된 모형에서 전위차에 영향을 주는 유의한 변수를 알아보는 것은 비파괴검사에서 중요하다고 할 수 있다. 본 연구에서는 관찰된 자료를 적절하게 설명할 수 있는 통계적 모형을 제안하고, 제안된 모형에서 유의한 독립변수를 찾아보는 것이 목적이다. It was verified that the effect of the distance between current input point and output point on direct current potential drop (DCPD) in the material with two-dimensional surface notch. If the distance between potential drop measuring points was fixed at a certain distance, the potential drop was decreased with increasing the distance between current input and output points. DCPD technique was a useful method for surface crack sizing because the potential drop was proportional to the length of notch. In this paper, we suggest a statistical model to describe the data and want to find a significant variables to effect to potential drop. We use R program to analyze the data.