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이주희,김창일,백종후,조정호,전명표,정영훈,이영진,이정배,이승대,Lee, Joo-Hee,Kim, Chang-Il,Paik, Jong-Hoo,Cho, Jeong-Ho,Chun, Myoung-Pyo,Jeong, Young-Hun,Lee, Young-Jin,Lee, Jeong-Bae,Lee, Seung-Dae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.3
The osseointegration of dental implant is influenced by many factors such as surface geometry, loading and the amount of bone. Thus, stability of the dental implant should be checked periodically. In order to test the stability of dental implant by using resonance frequency analysis, we designed a structure of transducers and fabricated a piezoelectric devices. Using finite element analysis, the thickness and length of piezoelectric device and transducers were tailorized and the optimized frequency of 10 kHz was obtained. The resonance frequency from simulation analysis and evaluation was estimated to be similar as 10 kHz. The osseointegration was further enhanced with increasing frequency from the evaluation result of the finite element analysis.
이주희,오정민,홍연우,김세기,백종후,이영진,이정배,이승대,Lee, Joo-Hee,Oh, Jung-Min,Hong, Younwoo,Kim, Seiki,Paik, Jonghoo,Lee, Young-Jin,Lee, Jeong-Bae,Lee, Seung-Dae 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12
A piezoelectric ultrasonic bone surgical instrument, usually used to remove the tartar out of teeth or to cut the dentine of the tooth, is a recently popular instrument for dental treatment due to its several merits such as small size, low-electric power and precision control of surgical operation. It has typically two parts of a tip and vibration system which is also composed of head, piezoelectric elements and tail-mass. In order to improve the performance of the instrument, it is important to standardize the size of the vibration system without tip for high performance. In this study, a Finite Element Analysis (FEA) was utilized to optimize the structure of ultrasonic instrument in vibration system. Consequently, this study revealed that influence of several tips on property were minimized and it showed good property at the frequency range of 22~32 kHz.
이주희,김연규,이종원,Joohee Lee,Younkyu Kim,Jongwon Lee 한국우주과학회 2022 우주기술과 응용 Vol.2 No.3
There are various systems that allow humans to safely maintain their space exploration missions and lives in completely different environments, such as the International Space Station, the Moon (the closest celestial body to Earth), and Mars (the only planet in the solar system for manned mission in the 2030s). Among them, when it comes to maintaining the basic breathing of humans, the human life support air management system is a key device system. Such an air management system can be used not only for space exploration but also for undersea bases and submarines on Earth where humans reside. The air management system basically consists of an oxygen generation system, a carbon dioxide removal system, and a harmful substance removal system. In this paper, in order to develop an air management system that can be used in an underwater residential platform, the development requirements of a ground test module to be used as an experimental facility were analyzed.
동의보감(東醫寶鑑) 허노문(虛勞門) 처방(處方)의 방제(方劑) 분석(分析)에 대한 고찰(考察)
이주희,윤현자,윤용갑,Lee, Ju-Hee,Yun, Hen-Ja,Yun, Young-Gab 대한한의학방제학회 2012 大韓韓醫學方劑學會誌 Vol.20 No.1
Objectives : As the understand about historical consumptive part through studying prescriptions in DonguiBogam, we would like to study some modern geriatric and chronic diseases. Methods : We analyzed application frequency of basic prescriptions, symptoms of prescriptions and the pathology analysis against historical comsumptive in DonguiBogam. Results : Through investigation into application frequency of basic prescriptions, symptoms of prescriptions, and two way analysis of Qi blood(yin yang) pathologies and viscera and bowels pathologies, we were able to found mostly used basic prescription, common symptoms, and separate some characteristics pathologies. Conclusions : We expected that this study will can help to give rationale for future study of consumptive caring.
담음(痰飮)에 대(對)한 문헌적(文獻的) 고찰(考察) -호흡기(呼吸器) 질환(疾患)을 중심(中心)으로-
이주희,오태환,정승기,이형구,Lee, Ju-Hee,Oh, Tae-Hwan,Jung, Sung-Gi,Rhee, Hyung-Koo 대한한방내과학회 1992 大韓韓方內科學會誌 Vol.13 No.1
This study has been carried out to investigate the cause and symptom treatment of Dam-Hum (痰飮) by referring to 41 literatures. The results were as follows; 1. The factors causing Dam-Eum (痰飮) divided into 3 groups. The 1st outer factors are six dirty (六淫), 2nd week and yanghu (陽虛), 3rd mental. 2. The symptom of Dam-Eum (痰飮) is as follows. (1) dam(痰) : cough, retching, pain of sub-ribs, vomiting, crazy, coma, dizziness. (2) eum(飮) : edema, stimulus feeling in throat, cough with pain, cough, hemoptysis indigestion. 3. The treatment of Dam-Eum (痰飮) is as follows. gudam(祛痰), sungi(順氣), bobipaesin(補脾肺腎), chungyul(淸熱), jesep(除濕). 4. The drugs of Dam-Eum (痰飮) is as follows. gudam (祛痰): ejintang (二陳湯), dodamtang (導痰湯), gunghatang (芎夏湯). sungi (順氣) : chilgitang (七氣湯), gamisachiltang (加味四七湯). babi (補脾) : gwibitang (歸脾湯), sagunjatang (四君子湯). bopae (補肺) : bapaetang (補肺湯), yunpaeeum (潤肺湯), saeumjun (四飮煎). bosin (補腎) : yukmihwan (六味丸), palmihwan (八味丸), singihwan (腎氣丸).
단체 급식 종사자와 일반주부와의 영양지식·위생지식 및 실행도 차이 비교연구
이주희,신지연,김창임,Lee, Joo Hee,Shin, Ji Yeon,Kim, Changim 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.6
This research is aimed at evaluating the nutrition knowledge and hygiene knowledge of people who are either foodservice employees or housewives and at providing data for conducting hygiene education by comparing the differences between the two groups. Both groups scored relatively high in nutrition knowledge with housewives scoring 9.9/12 and food service employees scoring 9.6/12. However, foodservice employees scored significantly higher in hygiene knowledge and degree of practice than housewives, A correlation was found between nutrition knowledge and the degree of hygienic practice and a significant correlation between hygiene knowledge and the degree of hygienic practice. The higher the hygiene knowledge was, the higher their degree of hygienic practice was. As for food hygiene information, foodservice employees obtained the information through hygiene education and lecture meetings, but housewives got their information through mass media. To summarize, mass media, which housewives can have easy access, must have programs for housewives to help them improve food hygiene in cooking, and programs for foodservice employees on washing food.
유한요소법을 이용한 고온용 초음파 유량센서의 설계 및 평가
이주희,김창일,백종후,조정호,정영훈,이영진,남산,Lee, Joo-Hee,Kim, Chang-Il,Paik, Jong-Hoo,Cho, Jeong-Ho,Jeong, Young-Hun,Lee, Young-Jin,Nahm, Sahn 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.11
An operation temperature of $Pb(Zr,Ti)O_3$ based piezoelectric ultrasonic flowmeter was generally restricted to below 200$^{\circ}C$ due to a low depoling temperature of its ceramic material. Thus, a new designed piezoelectric ultrasonic flowmeter was fabricated in order to protect from the extremely hot fluid. Its structure is optimized by a finite element method to effectively stop heat flowing along a waveguide. Various materials such as Cu, Al, SUS were examined as a multi-plate radiation shield to enhance the performance of piezoelectric ultrasonic flowmeter. The SUS was evaluated as the most effective material to enhance the performance of piezoelectric ultrasonic flowmeter. As the number of plates of the radiation shield increased, the temperature at piezoelectric transducer away from the hot fluid was constantly decreased with a ratio of 3.12$^{\circ}C$ per the plate number.
이주희,Lee, Joo-Hee The Korean Academy of Prosthodonitics 2017 대한치과보철학회지 Vol.55 No.2
목적: 이 연구의 목적은 새로운 타이타늄 구성요소를 가진 지르코니아 지대주의 나사 제거력의 변화에 대해 알아보는 것이다. 내부연결 임플란트를 위한 새로운 지르코니아 지대주의 동적하중 후 지대주 나사의 제거력을 기존의 타이타늄 지대주와 비교하여 분석하였다. 재료 및 방법: 내측연결 임플란트와 타이타늄 지대주, 타이타늄 구성요소를 가진 지르코니아 지대주를 준비하였다. 12개의 내부연결형 임플란트에 6개의 타이타늄 지대주를 연결하고(대조군), 6개의 타이타늄 구성요소를 가진 지르코니아 지대주(실험군)를 30 Ncm의 토크로 연결한 후 동적하중 전후의 나사 제거력을 측정하였다. 동적 만능재료시험기를 사용하여 연결체의 장축과 30도 각도를 이루도록 하고 300 N 하중크기로 100만번의 하중이 가해졌다. 동적하중 전후의 지대주 나사 제거력을 t검정을 통해 신뢰구간 95%로 통계적 유의성을 검증하였다. 결과: 두 그룹 모두에서 동적하중 후 나사 풀림을 보이지 않았다. 동적 하중 전후의 나사 제거력은 두 그룹 모두에서 통계적으로 유의한 차이가 있게 나타났다(P < .05). 동적 하중 전후의 나사 제거력 차이는 대조군에서 $-7.25{\pm}1.50Ncm$, 실험군에서 $-7.33{\pm}0.93Ncm$ 로 나타났다. 통계분석 결과 두 군간에 나사 제거력 차이에서는 유의한 차이를 보이지 않았다(P > .05). 결론: 이 실험의 결과에 한하여 타이타늄 구성요소를 사용한 지르코니아 지대주의 동적하중 후 지대주 나사 제거력의 변화는 타이타늄 지대주와 통계학적으로 유의한 차이를 보이지 않았다. Purpose: The aim of this study was to evaluate screw removal torque of the two-piece zirconia abutment with the novel titanium component compared to the conventional one-piece titanium abutment in the internal connection implant before and after dynamic cyclic loading. Materials and methods: Two types of the abutment assemblies with internal connection were prepared and divided into the groups; titanium abutment-titanium abutment screw assemblies as control, and zirconia abutment-titanium socket-titanium abutment screw assemblies as experimental group. A total of 12 abutments and implants were used of six assemblies each group. Each assembly was tightened to 30 Ncm. A cyclic load of 300 N at an angle of 30 degrees in reference to the loading axis was applied until one million cycles or failure. The removal torque values (RTVs) of the abutment screws were measured with a digital torque gauge before and after cyclic loading. The RTVs of the pre load and post load were analyzed with t-test, and P-values < .05 were considered statistically significant. Results: The assemblies of both groups survived all after the dynamic cyclic loading test without screw loosening. The statistically significant differences were found between the mean RTVs before and after the cyclic loading in both groups (P < .05). The RTV differences for the control and the experimental group were $-7.25{\pm}1.50Ncm$ and $-7.33{\pm}0.93Ncm$, respectively. Statistical analysis revealed that the RTV differences in both groups were not significantly different from each other (P > .05). Conclusion: Within the limitation of this study, the two-piece zirconia abutment with the titanium component did not show a significant RTV difference of the abutment screw compared to the titanium abutment after dynamic cyclic loading.