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박준철,김건호,홍순일,Park Jun-Chul,Kim Keon-Ho,Hong Soon-Il 한국가구학회 2004 한국가구학회지 Vol.15 No.2
As glulam is a woody material, it is necessary to be more careful in a gluing process. It takes 6-7 hours at $40-60^{\circ}C$ to harden PRF resin used in making structural glulam, and about 24 hours at room temperature. In the present process which can not use a press continuously, reducing the hardening time is necessary to increase production. The experiment was done to compare the adhesive properties of PRF resin and MUF resin through bending test, block shear strength test and water soaking test. In comparing the bending strength of prediction MOE is 1.2 times higher that actual MOE. PRF and MUF do not show significant difference in MOE and MOR, and in block shear strength test, such as shear strength and wood failure rate. However, in water soaking and boiling water soaking tests PRF and MUF show the significant difference in delamination rate.
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박준철,유승도,김정대,황경철,최준규 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.2
This study was performed to investigate vibration generated from machines that were used at factories and construction works. Vibrations were measured at three points in a straight line based on distance from the vibration sources, and analyzed to assess the vibration bevels. The average vibration level of factory machines was 65.4dBV at 2m, and that of construction machines was 74.0dBV at 5m. Vibration attenuations was 4.0~8.2dBV by double distance. All such data were applied to gain coefficients of attenuation equations for predicting vibration level by distance from the vibration sources. Data recorded on tapes were analyzed to understand the characteristics of frequency because these characteristics are important factors to design a Plan for installing the vibration-Proof devices. Finally, considering results from these analysis, assessment, and prediction, the methods for reducing vibration generated from machines were discussed.
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TLS/SSL 미적용 웹사이트들에 적용 가능한 단일 ID 및 패스워드 활용의 경량화 상호 인증
박준철 보안공학연구지원센터 2018 보안공학연구논문지 Vol.16 No.4
While more and more websites are supporting TLS/SSL, there still exist many websites that are not. Hence if a careless user sends out her ID and password to a non-TLS/SSL supporting website who uses a single set of ID and password across all enrolled websites, the credentials will be subject to being disclosed and then be submitted to a highly protected website to be recognized as a valid one. This threat is more critical when the possible victims are accessing websites via their smartphones, which are becoming popular these days. In this paper, we propose a secure and lightweight scheme for websites with or without TLS/SSL implementation by performing non-expensive operations for authenticating both parties. While an authenticating server is required to construct an authentication table, dividable if needed, with lots of hash values on a regular basis, each user is to just type in her unique pair of ID and password to logon but no more. The scheme also provides user untraceability across multiple websites by issuing a unique and unlinkable logon message each time. TLS/SSL를 적용하는 웹사이트들이 많아지기는 하지만, 그렇지 않은 웹사이트들도 여전히 존재하고 있다. 따라서 가입된 사이트들 모두에 같은 ID 및 패스워드를 쓰는 부주의한 사용자가 TLS/SSL를 채택하지 않는 웹사이트로 인증 정보를 보내면, 이 인증 정보는 노출의 위험에 놓이게 되며, 이렇게 획득한 인증 정보는 공격자에 의해 보안성이 높은 웹사이트에 침투해서 정상 인증 받는데 사용될 수 있다. 이는 특히 최근 많이 사용하는 스마트폰 등 모바일 기기를 통해 접속할 때 더 큰 위험이 된다. 본 논문에서는 가벼운 연산들만을 써서 웹사이트의 TLS/SSL를 지원 여부에 상관없이 사용 가능한 안전하고, 경량화된 상호 인증 기법을 제안한다. 인증 서버는 사용자 구분을 위해 주기적으로 다수의 해시 연산을 통해 분할 가능한 인증 테이블을 생성하여야 하지만, 사용자는 가입된 다수 웹사이트들에 대하여 동일한 한 쌍의 ID와 패스워드만을 기존과 같은 식으로 입력하면 된다. 제안 기법은 여러 웹사이트들 간의 인증 시 고유하고, 연결 불가능한 정보를 제시함으로써 사용자 불추적성도 제공한다.
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박준철,홍순일 한국가구학회 2002 한국가구학회지 Vol.13 No.2
This study was carried out to investigate the strength and technical feasibility of glulam from small diameter Pinus densiflora and Larix kaempferi. Small diameter logs are currently not used in structural laminated beam construction, but it is suggested that its properties may be feasible for this purpose. The glulam combinations were designed with high grade laminae located at outer laminations (face) and low grade laminae located at center laminations. Important problems of finger jointed glulam as a structural beam are the small modulus of rupture (MOR). One solution for this problem Mi to use veneer and solid wood as the face laminae. The MOE values were predicted for each beam from laminae. The results showed that actual beam MOE values exceeded slightly the predicted values. Based on the evaluation and analysis of Pinus and Larix glulam, the maximum load of Larix kaempferi glulam indicated large values. The bending properties of A and E types glulam were superior to others. It is suggested that this small diameter log can be a candidate for structural glulam construction, providing the proper combinations of face laminae.
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다낭난소증후군 환자에서의 우울, 불안, 스트레스를 유발하는 위험 인자
박준철 한국융합학회 2022 한국융합학회논문지 Vol.13 No.3
The aim of this study was to evaluate anxiety, depression and stress in women with polycystic ovary syndrome(PCOS) and to investigate the risk factors related to psychological difficulties. Sixty women with PCOS were evaluated for level of psychological stress using Beck depression inventory(BDI) and Depression anxiety stress scale(DASS) questionnaire. Serum antimullerian hormone, total testosterone, lutenizing hormone, follicle stimulating hormone, estradiol, lipid profile and 75g oral glucose tolerance test were measured. Thirty healthy women served as the control. Fifty two women with PCOS and 29 healthy women completed a questionnaire. Women with depression who scored >13 by BDI and >10 by DASS were 38.5 %, women with anxiety who scored >8 by DASS were 23.1 %, and women with stress who scored >15 by DASS were 30.8 %, which were significantly higher than control. In PCOS women, total testosterone, LH and AMH were significantly correlated with depression and stress. Weight, body mass index and waist-hip ratio were also significantly correlated with depression. In women diagnosed as diabetes and hyperlipidemia, depression and stress were significantly prevalent. Women with PCOS seemed to be more vulnerable to depression, anxiety and stress. Early diagnosis and management should be considered. 본 연구는 다낭난소증후군 여성의 불안, 우울, 스트레스를 평가하고, 발병 위험인자에 대하여 살펴보고자, 다낭난소증후군 여성을 대상으로 Beck's 우울증(BDI) 및 우울 불안 스트레스 척도(DASS) 설문을 시행하였고, 항뮐러리안호르몬(AMH), 총 테스토스테론, 황체형성호르몬(LH), 난포자극호르몬(FSH), 에스트라디올(E2), 지질대사 검사 및 당부하검사(OGTT)를 시행 후 분석하였다. 설문지를 완전히 작성하여 회수된 52명의 환자군과 29명의 건강한 가임기 여성 대조군을 분석하였다. 다낭난소증후군 환자 중 BDI>13점, DASS>10점인 우울증 38.5 %, DASS>8점인 불안 23.1 %, DASS>15점인 스트레스 30.8 %로 대조군에 비해 유의하게 높았다. 총 테스토스테론, LH 및 AMH는 우울증 및 스트레스와 유의한 상관관계를 보였고, 체중 및 체질량지수도 우울증과 유의한 상관관계를 보였다. 당뇨병과 고지혈증으로 진단된 여성에서 우울증과 스트레스가 높았다. 다낭난소증후군 여성은 우울증, 불안 및 스트레스에 더 취약한 것으로 나타나, 조기진단과 치료가 중요하다.
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