3차원 대면적 연속 마이크로 레이저 패터닝을 위한 연구

김경한,손현기,이제훈,Kim, Kyunghan,Sohn, Hyonkee,Lee, Jaehoon 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.4

For continuous laser micro patterning on three-dimensional free form surface, innovative laser system is developed. The two axis galvanometer is combined with the dynamic focusing unit to increase optical distance. Also, it is synchronized with the 3 axis mechanical system. To determine laser machining sequence, laser CAM system is developed. It can make possible of 3D surface micro patterning under $25{\mu}m$ pattern width. The uniformity of pattern width is about 2.8% and it is validated that focal plane is well conserved by the dynamic focusing unit. Velocity and positional information of 1 axis is stage is fed to the scanner control board by the encoder signal and it makes possible real time synchronization. With this system, possible patterning volume is enlarged from $40{\times}40mm^2$ to $40{\times}120{\times}30mm^3$.

한의약건강증진사업 담당자 인식도 조사

김경한,장수빈,정명주,최대범,황정운,김제명,사사키 유이,주용준,신용철,장보형,고성규,Kim, Kyeong Han,Jang, Soobin,Jung, Myung-Ju,Choi, DaePum,Huang, Ching Wen,Kim, Je-Myung,Sasaki, Yui,Ju, Yong-Jun,Shin, Yong-Cheol,Jang, Bo-Hyoung,Ko, Seo 대한예방한의학회 2016 대한예방한의학회지 Vol.20 No.1

Objectives : This study was aimed to survey the perception of public official on public health promotion programs in Traditional Korean Medicine (PHPP-TKM). Methods : Data were collected from 129 public officials who were in charge of PHPP-TKM business in the public health centers using the structured questionnaire. Collected data were analyzed through frequency analysis and T-test using SPSS 13.0. Results : Even though stroke prevention programs are implemented most often at present, respondents hope to practice dementia prevention programs in the future. The obstructive factor was measured by 5-point Likert scale, and the most obstructive factor was that there were neither standard manuals nor methodological guidelines for the programs($3.73{\pm}0.97$). The second most obstructive factor was that TKM-PHPP duplicated other public health programs($3.67{\pm}1.07$). The plan to activate TKM-PHPP was also measured by 5-point Likert scale. The most suggested plan was to develop competitive programs ($4.20{\pm}0.88$). The second most suggested plan was that of various integration of public health programs ($4.14{\pm}0.80$). Conclusions : The result of survey questionnaire suggests to develop various integrated programs, and to draw up a standard manual to activate the TKM-PHPP in public health centers.

수족농포증에 목초액 사용 후 발생한 자극 피부염 치험 1례

김경한,홍지희,정훈,정현아,Kim, Kyung-Han,Hong, Jee-Hee,Jung, Hoon,Jung, Hyun-A 대한한방안이비인후피부과학회 2014 한방안이비인후피부과학회지 Vol.27 No.2

목초액 외용 후 발생한 자극 피부염에 의한 홍반, 소양감, 통증 및 수장족저 농포증의 악화를 보인 환자에게 한방치료를 통해 유의성 있는 치료 효과를 확인할 수 있었으며 활발한 사례보고를 통해 부적절한 민간요법의 시행에 의한 폐해로부터 예방이 필요할 것으로 사료된다. Objectives : The purpose of this study is to report the oriental treatment on Irritant Dermatitis Caused by Wood Vinegar on Pustulosis Palmaris et Plantaris. Methods : After using Wood Vinegar, a patient suffers from erythema, pruritus, pain, desquamation of skin and degeneration of Pustulosis Palmaris et Plantaris. The patient was admitted to Dunsan oriental hospital for 15 days and took an oriental(venesection, herbal-medicine, and vapor treatment) treatment. To evaluate the results of this treatment, the improvement of symptoms(vesicles, pruritus, pain) was identified by patient's subjective expression and in lesion-symptom improvement. Results : The symptoms caused by Wood vinegar on both palms and soles were improved but the desquamation of skin remained. Conclusions : This study shows that the oriental medical treatment effects on the irritant dermatitis caused by Wood Vinegar. Also, the public should be aware of indiscreetly-used, natural herbal products as a folk remedy.

알루미나 세라믹 소재의 초단파 레이저 어블레이션량 연구

김경한,박진호,Kim, Kyunghan,Park, Jinho 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.4

In this paper, ablation rate of $Al_2O_3$ ceramics by femtosecond laser fluence is derived with experimental method. The automatic three axis linear stage makes laser optics to move with high spatial resolution. With 10 times objective lens, minimal pattern width of $Al_2O_3$ is measured in the focal plane. Ablated surface area is shown as linear tendency increasing number of machining times with various laser power conditions. Machining times is most sensitive condition to control $Al_2O_3$ pattern width. Also, the linear increment of pattern width with laser power change is investigated. In high machining speed, the ablation volume rate is more linear with fluence because pulse overlap is minimized in this condition. Thermal effect to surrounding medium can be minimized and clean laser process without melting zone is possible in high machining speed. Ablation volume rate decelerates as increasing machining times and multiple machining times should be considered to achieve proper ablation width and depth.

한국 행정개혁의 성과 평가 연구

김경한(Kim Kyung-Han) 서울행정학회 2005 한국사회와 행정연구 Vol.15 No.4

For the past ten years, Korean government have drove the government reform but many questions on the performance of the reform are raised by many researchers. The objectives of this study are to evaluate the performance of various government reform measures, to find out the obstacle factors to make those reform measures fail and to suggest the desirable methods and strategy of government reform. In order to achieve those research objectives, I did evaluation synthesis through content analysis on ten theses analysing the performance and the operation realities of the performance-based management programs such as Performance-based reward system, Management by objectives(MBO) and Open-system in higher civil service, which were introduced to Korean government as the tools of government reform during the period of Dae Jung Kim's administration. In conclusion, the performance-based management programs including Performance-based reward system, MBO and Open-system in higher civil service have no effectiveness because those programs are failing to accomplish the introduction objectives of each programs. The major reasons why those programs don't have effectiveness are identified as the cultural restraint, which occur by cultural inconsistency between the culture of public organization and the reform measures and cause government reform not to success. In addition, it is found out that symbolic politics is the main cause to push on with the introduction of performance-based management programs in spite of their incongruity to public culture and the probability to have no effectiveness.

초단파 레이저 조사시 티슈 열완화 시간 분석

김경한,이제훈,서정,Kim, Kyung-Han,Lee, Jae-Hoon,Suh, Jeong 한국레이저가공학회 2009 한국레이저가공학회지 Vol.12 No.2

Two methodologies for predicting thermal relaxation time of tissue subjected to pulsed laser irradiation is introduced by the calculation the optical penetration depth and by the investigation of the temperature diffusion behavior. First approach is that both x-axial and y-axial thermal relaxation times are predicted and they are superposed to achieve the thermal relaxation time (${\tau}_1$) for two-dimensional square tissue model. Another approach to achieve thermal relaxation time (${\tau}_2$) is measuring the time required for local temperature drop until $e^{-1}$ of the maximum laser induced heating.

이차자료원을 활용한 한의학 연구 고찰

김경한,장수빈,성주원,이한우,최윤호,신용철,장보형,고성규,Kim, Kyeong Han,Jang, Soobin,Sung, Joo Won,Lee, Han Woo,Choi, Yoon Ho,Shin, Yong-Cheol,Jang, Bo-Hyoung,Ko, Seong-Gyu 대한예방한의학회 2016 대한예방한의학회지 Vol.20 No.1

Objectives : The aim of this study is to review studies that utilized domestic secondary data in Traditional Korean Medicine (TKM). Methods : We identified variables and values related to TKM of 24 secondary data sources, and searched studies from 6 databases (PubMed, RISS, KISS, NDSL, KMBASE, OASIS). Results : There were 13 secondary data sources including variables and values related TKM, and 23 articles were included in this study. Conclusions : It is necessary to develop high-quality secondary data sources that are suitable to TKM system in accordance with national policy.

국내 한의약공공보건사업 최근 연구 분석

김경한,송현종,김지우,장보형,신용철,고성규,Kim, Kyeong-Han,Song, Hyunjong,Kim, Jiwoo,Jang, Bo-Hyoung,Shin, Yong-Cheol,Ko, Seong-Gyu 대한예방한의학회 2014 대한예방한의학회지 Vol.18 No.2

Objective : The aim of this study is to analyze the recent research of Korean Medicine(KM) public health promotion programs in Korea. Method : We searched the study using Korean Medicine Information System, Research Information Service System and Korean Studies Information Service. We analyzed studies by research content, publication year and type of journal. Results : Analysis by research contents, it was divided into survey research, policy research, development research and evaluation research. Analysis by publication year, little research had been conducted from 1990 until 2000 and most of the research was done since 2000. Analysis by type of journal, 53% of studies published by journals related with KM. Conclusion : Development and evaluation research of KM public health promotion programs should be actively conducted. It is also need to establish the foundation in which KM public health promotion programs would be expanded not only KM field but also in other fields.

고삼(苦蔘), 지실(枳實), 형개(荊芥), 연교(連翹), 마치현(馬齒?) 추출물이 포함된 외용제의 아토피 피부염에 대한 유효성 평가를 위한 임상연구

김경한,정현아,Kim, Kyung-Han,Jung, Hyun-A 대한한방안이비인후피부과학회 2014 한방안이비인후피부과학회지 Vol.27 No.1

Objectives : The purpose of this study is to investigate the efficacy of external preparation containing herbal extract(Sophorae Radix, Aurantii Immaturus Fructus, Schizonepetae Spica, Forsythia fructus and Portulacea Herba) on atopic dermatitis patients. Methods : A total of 33 patients who visited the Dept. of Ophthalmology, Otolaryngology & Dermatology of Korean Medicine of Korean Medical hospital of Daejeon university from February 2012 to February 2013 were engaged in this study. Patients who corresponded the requirements were enrolled in the study. This study shows symptom comparisons before and after the use of this product. Effectiveness was evaluated through SCORAD(SCORing Atopic Dermatitis) Index, and the quality of life scale was conducted through Skindex-29. Results : 1. Comparison of the general changes through SCORAD Index indicated that the experimental group showed more statistically significant declines than the placebo group after the two-week use. 2. Comparison of changes in intensity criteria(Erythema, Edema, Oozing, Excoriation) through SCORAD Index indicated that the experimental group showed more statistically significant declines than the placebo group after the two-week use. 3. Comparison of changes in subjective symptoms through SCORAD Index indicated that the experimental group showed no statistically remarkable changes. 4. Comparison of changes in the body parts(Upperlimb) through SCORAD Index indicated the experimental group showed statistically significant changes after the two-week use. 5. Comparison of the general changes in quality of life through Skindex-29 indicated that the total score from experimental group showed statistically significant changes after the four-week use. Conclusions: This study, evaluated through SCORAD Index, indicated that the treatment with the external preparation containing herbal extract has a statistically marginal significance of efficacy on atopic dermatitis patients in the short term.

삼사정계의 축과 원자좌표를 직교규격좌표계로의 변환

김경한,오미란,서일환,Kim, Gyeong-Han,O, Mi-Ran,Seo, Il-Hwan 한국결정학회 1996 韓國結晶學會誌 Vol.7 No.2

많은 기하학적 계산은 임의의 결정학적 축에서 보다 orthonormal 축에서 훨씬 쉽게 이루어질 수 있다. 본 논문에서는 triclinic cell data와 원자좌표들을 orthonormal 좌표계의 것으로 변환하는 식을 유도하고 computer program화 하였다. Geometrical calculations are often more easily made in an orthonormal than in a crystallographic frame. In this paper a rational for the transformation from a triclinic cell data and atomic coordinates to orthonormal ones has been shown and a computer program has been made for the transformation.