주조/단조 공정에서 Al6061의 단조효과에 관한 연구

권오혁(Oh Hyuk Kwon),배원병(Won Byong Bae),조종래(Jong Rae Cho) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.11

In this study, the casting/forging process was applied in manufacturing a low control arm, in order to prove that application of casting/forging process to Al6061 is likely to get the effect of light weight compared with existing steel products and to reduce the cost of materials. Firstly, In order to set up the optimum casting condition of the forging material, Al6061, casting experiments were carried out by controlling pouring temperature of the aluminum for casting, mold temperature, and pouring time. 700℃ pouring temperature, 300℃ mold temperature and 10-second pouring time were taken into account as the optimum casting conditions. With respect to a hot forging test, it is practiced on the basis of a temperature of materials, strain rate, and reduction rate so as to observe each microstructure and examine strain-stress curve simultaneously; examine tensile test and hardness test; eventually set up the optimum hot forging condition. A hot forging test, tensile test, hardness experiment, and microstructure observation were carried out on condition of 70% reduction rate, 500℃ temperature of materials, and 1 strain rate. As a result of those experiments, 330MPa tensile strength, 16.4% elongation, and 122.8Hv hardness were recorded. In oder to get a sound preform which has no unfilling cavity and less flash, two preforms were proposed on the basis of volume rate of the final product; the optimum volume rate of preform for the low control arm was 115%. In conclusion, it is confirmed that using the forging material rather than casting materials in casting/forging process is likely to get more superior mechanical properties. Compared with Al6061, performed by means of general forging, moreover, cast/forged Al6061 can not only stimulate productivity by reducing production processes, but cut down the cost of materials by reusing forging scraps.

둥근형과 장방형 얼굴에 어울리는 모발 길이와 감성적 이미지 지각

권오혁 ( Oh Hyuk Kwon ),김민 ( Min Kim ),김기영 ( Ki Young Kim ) 한국미용학회 2012 한국미용학회지 Vol.18 No.6

This study tried to focus on figuring out the suitable hair length for round face and long face and the emotional image depending on the hair length. 2 Female models were direct measured breadth and length of face. And they wear 3 kinds of wigs in length and took photos for using of survey. A survey was carried out on the general public and hair professionals. The results are as follows. A model of round face measured 13.8 cm in face breadth and 18.4cm in face length, the ratio of 1.00 to 1.33, which she had 0.9 cm broader and 0.2 cm shorter than average breadth of Korean face. A model of round face measured 13.2 cm in face breadth and 20.9 cm in face length, the ratio of 1.00 to 1.58, which she had 0.3 cm broader and 2.1 cm longer than average length of Korean face. In this survey, the general public and hair professionals perceived that long hair in length was best for round face because it was soft, feminine and nice to look at, and short hair in length looked lively and younger, but it made a masculine and stiff impression. They also perceived that short hair in length was best for long face, and it was feminine, intellectual and nice to look at, but medium hair in length made a gentle and stiff impression. Consequently, as the hair length has a big effect on the image like make-up, the creation of appropriate hair styles for face shape is necessary for modern people.

DNA 특성을 모방한 심혈관질환 진단용 하드웨어

權五奕(Oh-Hyuk Kwon),金主經(Joo-Kyung Kim),河丁友(Jung-Woo Ha),朴宰賢(Jeahyun Park),鄭德鎭(Duck-Jin Chung),李鍾浩(Chong-Ho Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.2

In this paper, we propose a new algorithm emulating the DNA characteristics for noise-tolerant pattern matching problem on digital system. The digital pattern matching becomes core technology in various fields, such as, robot vision, remote sensing, character recognition, and medical diagnosis in particular. As the properties of natural DNA strands allow hybridization with a certain portion of incompatible base pairs, DNA-inspired data structure and computation technique can be adopted to bio-signal pattern classification problems which often contain imprecise data patterns. The key feature of noise-tolerance of DNA computing comes from control of reaction temperature. Our hardware system mimics such property to diagnose cardiovascular disease and results superior classification performance over existing supervised learning pattern matching algorithms. The hardware design employing parallel architecture is also very efficient in time and area.

보문 : 커트교육시 모발길이의 기준점에 대한 인식과 필요성에 관한 조사

권오혁 ( Oh Hyuk Kwon ),박은준 ( En Jun Park ),정성모 ( Sung Mo Chung ),김기영 ( Ki Young Kim ) 대한미용과학회(구 한국두피모발미용학회) 2010 대한미용학회지 Vol.6 No.2

In today`s haircut education, detailed charts and hair length with out line and face line for the hair styling are not concrete and clear presented. And thereby many errors are made and due to the limitations in communications required for accurate explanations and understanding. So that in this study, the 210 hair designers were investigated 7 questions about general characters, 9 questions about haircut education, 8 questions about hair length charting, and collected 210 effective questionnaires were analysed statistically by SPSS ver. 16.0 for Windows program. In the result, 71.9% of 210 people were dissatisfied in question about the haircut education. And the need of a charted haircut in education is such a need 89.5% of them, 87.1% of respondents have not experience receiving a charted haircut and 91.6% may be receive charted haircut when they have a education chance. 60.5% answered that the nape point (NP) should be the base point when setting the hair length of the outline, and 54.3% would be suitable for long hair 25 cm, 58.3% for medium length 15 cm, 48.8% for short length 5.0 cm. 66.2% answered that when setting the hair length of the face line, the center point (CP) should be the base point. When setting the hair length of the face line, 57.6% would be suitable for long length under the chin line 17 cm, 58.3% for medium length under the nose line 10 cm and 63.3% for short length under the eyebrow line 5.0 cm. In conclusion, it was found that there are an immediate need for adaptable charting and specifying hair length for haircut education, and may be received basic data for useful length of 3 different hair styles.

센서네트워크를 이용한 FCM 교량의 처짐 관리 방안 연구

조병완,태기호,권오혁,Jo, Byung-Wan,Tea, Ghi-Ho,Kwon, Oh-Hyuk 한국방재학회 2008 한국방재학회논문집 Vol.8 No.4

본 연구에서는 FCM 교량의 시공 시 발생하는 처짐과 시공 후 발생하는 처짐의 관리를 위해 센서 네트워크를 활용한 처짐 관리 기술을 제안하고자 하였으며, 센서에 의한 검증실험과 제안된 USN를 이용하여 실제 건설되어지고 있는 현장에 적용함으로써 그 효율성을 입증하였다. 향후, USN은 교량의 장거리 건전도 모니터링에 매우 유용할 것이라 생각된다. Ubiquitous technology is proposed which is used wireless sensor network for deflection management at casting and after casting of FCM bridge. Proposed method are analyzed which are sensor experiment and existing FCM bridge using ubiquitous sensor network. Wireless sensor network enables low-cost sensing of environment. As a results, the field application shows that USN is useful method for structural health monitoring system which long distance away.

헤어 미용교육 브랜드별 비교를 통한 응용 커트 분석

정윤석 ( Yun Seok Jung ),권오혁 ( Oh Hyuk Kwon ),최근희 ( Keun Hee Choi ) 한국미용학회 2009 한국미용학회지 Vol.15 No.4

The paper is significant in the sense that the practical application of haircut based on comparison analysis of typical hair brand. The paper is composed of as follows: Section 1, briefs purpose and methods of the paper. Section 2, explains haircut techniques that are backgrounds of typical hair brand theory. Section 3, describes techniques that needs in Korean-style haircut and explains characteristics, differences, and merits and demerits. In conclusion, the paper examines the need for Korean-style haircut: First, by comparing western and eastern haircut, basic techniques in haircut are interactive relationships among multiple factors and ideas of designers and backgrounds in diversity are base for Korean-style cut. Second, there are differences in basic principle and streams by comparing western and eastern modeling recognition. This paper contributes for reforming western hair style into newly created style that is matching with Korean and then changes foreign style into Korean-style by summarizes eight steps of operation processes. This paper shows that newly crated styling cut can be introduced by analyzing western and eastern style. More explicit methods need to be developed from this study. It was hard to empirically shows exact data result because previous literatures do not exist. It would be better if experiments based on data from various models were performed.

뷰티살롱 종사자(從事子)의 직무교육(職務敎育)이 뷰티 서비스에 미치는 영향(影響)

홍미라 ( Mi Ra Hong ),권오혁 ( Oh Hyuk Kwon ),최근희 ( Keun Hee Choi ) 한국미용학회 2010 한국미용학회지 Vol.16 No.2

In the present day, the expression of beauty is developing and growing into the beauty culture based on science with the value of `Art`, and facing unlimited age of keen competition. To follow up with a trend like this, it is needed to be prepared and competitive. As fast changing as the beauty industry, human resources are heavily valued based on the fact that frequent changes on lots of employees` desire and the need of high-education, highsalary, oversized employees which led to the great need of systematization. Despite the phenomenon like this, however, the studies on tasks of beauty industry have not been done at all, and if we consider the importance of it, the subject needs attention and studies on the side of beauty academic world and practical affairs. This study is designed to analyze and verify effects of job training on beauty industry employees. The specific purposes of this study is followed. First, it is for shaping theories related to beauty industry`s job training through theoretical consideration. Second, it is to suggest right direction of job training system in the future by analyzing the effects of job training on its service related to the characteristics of beauty industry. This study was searched for all published studies of aspects of job training implementation and evaluation pertaining to each of the job training. With the basis of this prior studies, this study will prove specific purposes of them through consideration of theories systematically so that we were able to extract related variables, set up the hypothesis, and ran the survey to prove the hypothesis. Because we tried to be realistic on this study, we combined searches of related studies done by others and the survey to be positively verified. The survey of this study were total of 40 questions consisted of population statistical questions, job training related questions, satisfaction and service question after job training. The analysis was done by evaluating characteristics of variables in each survey. To verify the hypothesis, we grasped characteristics of population statistics by frequency testing.

헤어스타일 연출시 상담요인과 집단별 만족도 차이

홍진선 ( Jin Sun Hong ),권오혁 ( Oh Hyuk Kwon ),최근희 ( Keun Hee Choi ) 한국미용학회 2010 한국미용학회지 Vol.16 No.3

The aim of this study was to examine the influence of counseling process upon the customer satisfaction during the hair styling, by analyzing and comparing the opinions of ordinary respondents and professional respondents who used hair salons and determining various counselling factors. As a result, the following conclusions have been derived. First, the results suggested that the consumer group used their decisions as a source of information and the professional group used the mass media as a source of information when they decide their hair styles. Second, the consumer group chose a rough explanation, unkindness, service charge, bad attitude, dissatisfaction with hair-do and use of technical terms as the dissatisfactory factors in counselling, while the professional group chose a different though between the professional respondent and hair designer as the dissatisfactory factors in counselling. Third, four factors were derived from the consumer group in the influence of counseling factors upon the customer satisfaction: appropriate counseling factor of professionals, affirmative word-of mouth factor, customer image factor and communication factor. Fourth, the results indicated that the appropriate counseling factor of professionals and affirmative word-of mouth factor had a positive(+) influence upon the sufficient counseling factor before hair-do, satisfaction factor 1, while affirmative word-of mouth factor had a positive(+) influence upon the reliability factor, satisfaction factor 2, in the consumer group. It is necessary to recognize that the hair styling achieved by techniques has gone by and the improvement of beauty service and efficiency in beauty salon are required for the improvement of customer satisfaction. Therefore, the effective counseling and the right hair style will lead to the reliability of customers as well as their revisit.

뷰티산업의 감성 서비스 요인별 고객만족도

문금옥 ( Keum Ok Mun ),권오혁 ( Oh Hyuk Kwon ),최근희 ( Keun Hee Choi ) 한국미용학회 2012 한국미용학회지 Vol.18 No.1

As emotion came to the fore in such fields of service industry as emotional management, emotional marketing, emotional engineering and emotional leadership in the 21st century, all the cultural fields also have attached great importance to the value of emotion, thus positioning the emotional trend as a new tide of times. Purpose of this study was to examine the literature on the emotional services of existing cosmetic service business and then present the components of emotional service marketing. In addition, the investigator examined the influence of the five emotional service components recognized by beauty salon users upon customer satisfaction and significance, in order to minimize customers` complaint and cope with customer psychology appropriately, thus providing help in establishing emotional service marketing strategies for customers` re-visitation. In order to concretely materialize consumers` emotional desires in the sales of tangible products and intangible services, it is necessary to examine and find out consumers` psychology. So, the investigator established the service areas of five senses as influential variables upon such dependent variables as satisfaction and preference. And the investigator carried out the analysis on satisfaction and significance as parameters and then statistically processed it through a questionnaire survey. Study findings showed that all the service areas of five senses (sight, hearing, taste, touch and smell) had statistically significant influence upon significance and preference. Among them, the sense of sight had the biggest influence upon significance and preference and it was followed by the sense of touch and the sense of smell in order. In addition, study findings showed that beauty salon customers recognized cosmetic services not only by its technologic aspects but also by their five senses` emotional aspects and regarded their five senses` satisfaction with services as their satisfaction with the beauty salon itself. Furthermore, their preferences of a certain beauty salon were influenced by their five senses` satisfaction with services as well.

트리콜로지스트의 전문성이 두피모발관리 서비스이용에 미치는 영향

최혜진 ( Hye-jin Choi ),권오혁 ( Oh-hyuk Kwon ) 한국미용학회 2021 한국미용학회지 Vol.27 No.5

In modern society, the importance of scalp hair care is increasing. Therefore, we would like to suggest a direction for improving the expertise of trichologists as a way to meet the demand for customized scalp and hair care services. In this study, a total of 298 questionnaires were used as frequency analysis, factor analysis, reliability analysis, regression analysis, and correlation analysis data through SPSS 26.0. analyzed. The survey results regarding the use of scalp and hair care services are as follows. First, trichologist expertise was classified as a single factor, and service use intention was classified as perceived usefulness and subjective normative factors. Second, the higher the expertise of the trichologist, the greater the effect of the intention to use the scalp and hair care service on the perceived usefulness factor and the subjective normative factor. In conclusion, we hope that more research will be done to strengthen the expertise of the trichologist, a senior workforce in the rapidly evolving beauty and health care industry.