• Transactions of Materials Processing
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• v.30 no.2
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• pp.61-68
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• 2021

As part of efforts to reduce the weight of automotive body-in-white, a hybrid center pillar with high strength 7075 aluminum alloy (AA7075) sheet and carbon fiber reinforced plastic (CFRP) has been recently studied. In the fabrication of the AA7075-CFRP hybrid center pillar, the AA7075 sheet might go through heating-forming-in-die quenching (HFQ), artificial aging, hybridizing, and then paint baking processes. In this study, we investigate the effects of the heat treatment history associated with each process on the tensile strength of the AA7075 sheet. Typical heat treatment conditions are HFQ for 20 minutes at 480℃ and then cooling down with die, artificial aging of T6 temper for 24 hours at 120℃, hybridizing for 10 minutes at 150℃, and paint baking for 20 minutes at 180℃. The tensile strength of the AA7075 sheet is continuously increased by a series of heat treatments of hybridizing and paint baking and is expected to have yield stress above 500MPa without artificial aging of T6 temper.

• The Journal of Korean Physical Therapy
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• v.11 no.1
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• pp.23-43
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• 1999

A study on severity of cerebro-vascular accident patients in Korea was conduced in order to determine the risk factors affecting the severity of stroke patients. This study was performed by interviewing a total of 477 hospitalized and ambulatory patient of CVA in Seoul, Taejon, and Taegu and Pusan areas from April 1, 1998 through June 30, 1998. The results are as follows; 1. Two hundred and sixty seven $(56\%)$ at Four hundred and seventy seven subjects were manes, md two hundred and ten $(44\%)$ were females. $28.3\%$ of the subjects' ages were 50's and $27.3\%$ were 60's and $18.5\%$ were 70's. $22.6\%$ of the subjects' occupations were home makers, $17.8\%$ were farming. $66.4\%$ of the subjects spent their childhood in urban areas and $33.1\%$in rural areas. $41.7\%$ of the subjects became violin of CVA in Spring, $35.0\%$ in Winter. 2. On physical and mental conditions of the subjects at the occurrence of CVA, $28.7\%$ of the subjects were engaged in physical activities. $22.6\%$ were in a rest stale $19.5\%$ were in sleeping and $18.9\%$ were mentally shocked. $79.4\%$ of the male subjects and $14.8\%$ of female subjects smoked cigarettes. $82\%$ of male subjects drank coffee. $81.1\%$ of the subjects did not exercise regularly. $45.9\%$ of the subjects had the systolic blood pressures in the range of 160 to 199 mmHg and $5.6\%$ of the subjects had hypertension before the occurrence of stroke and $11.7\%$ had diabetes. 3. Of the types of strokes, cerebral hemorrhage was the highest $(49.1\%)$. cerebral infarction was the second $(41.1\%)$. Severe strokes were found in cerebral hemorrhage cases $(52.0\%)$ and cerebral infarction cases $(40.1\%).\;50.9\%$. of the male subjects were moderate cases, $50.9\%$ were severe cases. In females, moderate cases were $72.4\%$, severe cases $15.2\%$. $37.5\%$ of the subjects who had preceding diseases were severe cases, and $15.6\%$ of the subjects without preceding diseases were severe cases. $50.7\%$ of the subjects whose family members had strokes had severe strokes. $34\%$ of the subjects sleeping less than 6 hours a day, $42.4\%$ of the subjects with irregular eating habits, $33.3\%$ of the subjects who liked meat, and $42.3\%$ of the subjects who liked salty foods had severe strokes. $35.9\%$ of the subjects with hot temper, $27.6\%$ of the subjects with moderate temper and $14.5\%$ of subjects with mild temper were severe cases. 4. The correlation coefficient between obesity and blood pressure was 0.094.

• Transactions of the Korean Society of Mechanical Engineers
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• v.15 no.5
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• pp.1665-1673
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• 1991

본 연구에서는 운전이력이 다른 보일러 과열기 및 재열기에서 수취한 Cr-Mo강 증기관을 대상으로 이 SP 시험법을 도입하여 SP시험에 의한 재질열화의 평가 가능성을 연구 검토하였다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2015.11a
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• pp.315-316
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• 2015

이 논문에서는 생체정보를 활용하여 심리적 흥분의 측정 가능성에 대한 연구를 하였다. 지능형 전자발찌의 도입에 있어서 생체정보와 감정의 관계를 연구하는 것은 매우 필요하다. 위험상황을 예측하는데 있어서 부착자의 감정을 측정할 수 있다는 것은 하나의 중요한 지표가 될 수 있다. 자율신경계와 감정은 밀접한 관게가 있으며 교감신경은 신체적 반응을 불러일으키는 역할을 하므로 심박을 통해서 감정의 변화, 즉, 심리적 흥분을 측정하는 것은 가능할 것으로 예측된다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.291-293
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• 2003

본 논문은 유아의 부모와 웹(web) 상에서 대화를 통하여 유아의 기질을 진단하기 위한 지식형 시스템 구축에 관하여 기술하였다. 유아의 기질 확인을 위한 전문가의 지식은 DB(DataBase)와 지식 베이스로 전산정보화 되어졌다. 또한 아이의 기질 특성을 진단하기 위해 추가적 도움이 될 수 있도록 다양한 동영상을 지원하여 부모들이 시청하고 쉽게 이해할 수 있도록 시스템을 구성함으로써 부모가 아이의 기질을 조기진단하고 기질에 적합한 방식으로 양육함에 도움을 주고자 하는데 연구의 주안점을 두었다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.49 no.3
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• pp.56-61
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• 2012

User authentication is a necessity to set up secure system which only an authorized user can use various resource on the Internet. Encryption is to provide data privacy. Also, searchable encryption is to provide both data privacy and efficient management of data by searching with a keyword. The public key based searchable encryption requires in advance the authentication of user's public key as well as the secure management of a publlic/private key of a user, respectively. In cloud, it is purpose to use cloud various resources by using various devices, meanwhile, it is not sufficient resource that some devices manage public/private keys and certificates and it is not easy to implement these clients. To solve this problem, we propose a password-based saerchable encryption using smart cards which are temper-resistant devices.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.24 no.6 s.177
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• pp.1398-1407
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• 2000

The structural steels of power plant show the decrease of mechanical properties due to degradation such as temper embrittlement, creep damage and softening during long-term operation at high temper ature. The typical causes of material degradation damage are the creation and coarsening of carbides(M23C6, M6C) and the segregation of impurities(P, Sb and Sn) to grain boundary. It is also well known that material degradation induces the cleavage fracture and increases the ductile-brittle transition temperature of steels. So, it is very important to evaluate degradation damage to secure the reliable and efficient service condition and to prevent brittle failure in service. However, it would not be appropriate to sample a large test piece from in-service components. Therefore, it is necessary to develop a couple of new approaches to the non-destructive estimation technique which may be applicable to assessing the material degradation of the components with not to influence their essential strength. The purpose of this study is to propose and establish a new electrochemical technique for non-destructive evaluation of material degradation damage for Cr-Mo steels which is widely used in the high temperature structural components. And the electrochemical anodic polarization test results are compared with those of semi-nondestructive SP test.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.5C
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• pp.548-555
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• 2006

This paper proposes on the Sasang constitution classification method which is the most important things in the Sasang constitution medicine. Pre-existing methods of Sasang constitution classification are a shape of the body and its countenance & morpological aspect and temper. Many diagnostic methods have been developed and used including the questionnaires on personal life style and propensities(QSCC, QSCC II), and the tonal analysis of person's voice. Recently the constitutional acupunture and the herbal medicine response analyses are developed and used additionally. But these methods which is done by the doctor's intuition. In this article, I propose a methodology to classify the Sasang constitution. pitch, intensity and formants are used to classify the Sasang constitution by comparing the similarities and differencies of tonal analysis. Finally, the validity of the method is proven through the experiments.

• Journal of the Korean Society of School Health
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• v.3 no.1
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• pp.119-134
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• 1990

The purpose of this study is to find out the need for sex education of middle school students and their parents. For the data collection, the survey was conducted during the period from September 10 to September 20, 1989 by using prepared questionnaire. A questionnaire was given to 592 students of 1st, 2nd and 3rd grade from four middle schools and to 408 their parents in Suwon City. The major results are summarized as follow; 1. Among the 25 questions were asked about knowledge of sex, the structure of reproductive organs, physical change during puberty, menstruation, Sexually stimulation and family plan were answered correctly by over 50% of the students. The higher the grade, the more the knowledge of sex. There was no significant difference between this knowledge and with eider sister or brother. Among the 20 questions were asked about knowledge of sex, sexually stimulation, pregnancy, emission, induced abortion and sexually transmitted disease were answered correctly by over 50% of the parents. 2. 30 questions were asked about attitude of sex, 47.7% of the students and 53.4% of the parents answered 'positive'. There was no significant difference between grade and sex of students. A significant difference '.vas not also found between years and education level of parents. 3. In case of students, experience of sex education was showed the structure of reproductive organs, physical change during puberty, temper during puberty, menstruation, emission more. In the event of parents, experience of sex education was showed the structure of reproductive organs, temper during puberty, menstruation, emission, relationship with apposite sex more. Most students felt that sex education should begin from the first grade of middle school and the first grade of high school strongly. In parents was showed the need for sex education from the primary school and the first grade of middle school highly. Namely, students and parents felt that sex education should begin from puberty. To help good developments and growth of middle school students with rapid change should be educated sex eduction properly for the occasion.

• Journal of Acupuncture Research
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• v.19 no.2
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• pp.149-163
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• 2002

Objective : We have studied literatures of Renying Qi mouth comparison pulse diagnosis theory and distinguished the excess, deficiency and quick-temper of pulse as the measurement parameter of Renying Qi mouth pulse diagnosis. Methods : We have acquired pulse signals of Renying Qi mouth by using diagnostic equipment of Renying Qi mouth pulsation and estimated reappearance of pulse signals. Results : 1. The measurement parameter of Renying Qi mouth pulse diagnosis distinguishes the excess, deficiency and quick-temper of pulse through relative comparison of Renying Qi mouth. 2. When we acquired the pulse singals of Renying Qi mouth by using diagnostic equipment, the property, measuring area, bias pressure, contact or adhesion state of the sensor are considered. 3. As getting the pulse signal of Renying Qi mouth, the sensor of a sound detective mode is effective. 4. The diagnostic equipment of Renying Qi mouth pulse is assessed as being significant reappearance.