• 제목/요약/키워드: Withdrawal type

검색결과 101건 처리시간 0.022초

Evaluation of Withdrawal Resistance of Screw-Type Fasteners Depending on Lead-Hole Size, Grain Direction, Screw Size, Screw Type and Species

  • LEE, Hyung Woo;JANG, Sang Sik;KANG, Chun-Won
    • Journal of the Korean Wood Science and Technology
    • /
    • 제49권2호
    • /
    • pp.181-190
    • /
    • 2021
  • Screw-type fasteners are widely used to make connections between wood members or between wood and steel connectors because they can tolerate the applied loads by withdrawal or shearing. In this study, we evaluated the withdrawal resistances of the screw-type fasteners and analyzed the effects of the lead-hole size, relative grain direction (tangential, radial, and cross-sections) of the wood member, screw diameter, screw type, and species. Two wood species, including domestic larch and imported spruce, and three screw-type fasteners, including domestic lag screws (diameters of 9.46, 7.79, and 6.27 mm), domestic tapping screw (diameter, 6.3 mm), and imported Sherpa screw (diameter, 8.0 mm) were used. To assess the effect of lead-hole size, the lead holes with diameters corresponding to 68.7%, 70.8%, and 74.0% of the shank diameter of the lag screw were predrilled. The lead hole corresponding to 74% of the shank diameter was selected for this study because the smaller lead holes required higher rotational force for installation, which may cause damage in the screw neck, although there was no significant difference in the withdrawal resistance depending on the lead-hole sizes applied in this study. The lag screws installed on the tangential and radial surfaces showed similar withdrawal resistances to each other, which were greater than those installed on the cross-sectional surface. As the lag screw diameter increased from 6.27 mm to 9.46 mm, the withdrawal resistance also increased proportionally. The withdrawal resistance of the tapping screw having a diameter of 6.3 mm was almost 1.6 times higher than that of the lag screw having a similar diameter of 6.27 mm, while that of Sherpa screw having a diameter of 8.0 mm was around 1.4 times higher than that of the lag screw having a similar diameter of 7.79 mm.

건설 예정인 댐에서 유역유출과 취수형태에 따른 탁수의 거동 예측 (Simulation of Turbid Water According to Watershed Runoff and Withdrawal Type in a Constructing Reservoir)

  • 박재충;최재훈;송영일;유경미;강보승;송상진
    • 환경영향평가
    • /
    • 제19권3호
    • /
    • pp.247-257
    • /
    • 2010
  • Watershed runoff and turbid water dynamics were simulated in the Youngju Dam, being constructed. The runoff flow and suspended solids were simulated and then thermal stratification and turbid water current in the reservoir were predicted by HSPF and CE-QUAL-W2 model, respectively. Considering selective withdrawal, we hypothesized 3 withdrawal types from the dam, i.e. surface layer, middle layer and the lowest layer. The maximum concentration of SS was 400mg/L in reservoir and it was decreased by the withdrawal. The inflowed turbid water fell to 30 NTU after 12 days regardless of the withdrawal types, but the surface layer withdrawal was a better type at turbid water discharge than the others. In current environmental impact assessment(EIA), we concluded that runoff and reservoir water quality predicted by HSPF and CE-QUAL-W2 was desirable, and appropriate parameters were selected by continous monitoring after EIA.

아동의 위축 및 공격성에 대한 관련변인들의 관계: 거부적 양육행동, 또래괴롭힘, 부정적 부모표상 및 부정적또래표상의 인과효과 (Variables Related to Children's Withdrawal and Aggression: Causal Effects of Rejection, Victimization, and Negative Representation by Parents and Peers)

  • 김귀연;김경연
    • 아동학회지
    • /
    • 제26권6호
    • /
    • pp.247-266
    • /
    • 2005
  • Subjects of this study were 621 children selected from 5th and 6th grades of elementary schools in Pusan. Factors associated with parents and peers varied by type of peer maladjustment(aggressive type and withdrawn type, compared with a control group). Particularly, the level of factors associated with peers varied from the control group by peer maladjusted types(aggressive types and, withdrawn types). Causal relationships of parents' rejection, victimization, negative representation by parents and by peers on child?s maladjustment varied by behavior types. Negative representation of peers had a direct effect only on withdrawal. On the other hand, negative representation of peers had no effect on aggression. Victimization had a first total effect on both withdrawal and aggression.

  • PDF

비 마약성 진통제 DA-5018의 신체의존성 (Physical Dependence on DA-5018, a Non-narcotic Analgesic Agent)

  • 강경구;김동환;백남기;김원배;양중익
    • Biomolecules & Therapeutics
    • /
    • 제4권3호
    • /
    • pp.232-238
    • /
    • 1996
  • The physical dependence potency of DA-5018, a non-narcotic analgesic agent, was tested in mice dosed with 0.5 and 4 mg/kg/day for 2 months and daily increasing doses of 1, 2, 4, 6, 8 and 10 mg/kg over 10 days. Physical dependence was assessed taking natural withdrawal induced morphine-type abstinence (jumping, falling, biting or backward locomotion, rearing etc.) as well as barbiturates-type abstinence (body weight reduction, convulsion, ataxia etc.) into consideration. The results were compared with those after the same daily increasing doses of morphine. DA-5018 did not show evidence of physical dependence liability or abuse potential as measured by morphine-type or barbiturate-type abstinence signs following daily increasing or 2-month repeated administration. On the other hand, daily increasing doses of morphine produced physical dependence and the dependent state disappeared about 6 hours after the start of withdrawal signs. In the single dose suppression test, a single dose of morphine completely suppressed natural withdrawal signs that appeared in morphine-dependent animals. Therefore, these results indicate that DA-5018 does not have abuse potential and physical dependence liability.

  • PDF

부모-자녀 유대관계와 우울성향에 관한 연구 (A Study on the Parent-Child Bonding Relationship and the Adolescents` Depression)

  • 신효직
    • 가정과삶의질연구
    • /
    • 제15권4호
    • /
    • pp.27-40
    • /
    • 1997
  • The purpose of this study was to investigate adolescents' maladjustment in terms of type and source of social support. The main results of this study were as follows; 1. In social support source the mean score of peer support was higher than family support. In social support type the mean score of expressive support was higher than other support type. 2. Social support source was found significantly different according to sex of the children educational level of the father and mother. Malajustment were found significantly different according to sex of the children educational level of the father and mother income and marital satisfaction of the mother. 3. In social support source it was significantly different according to all maladjustment subscale in family support and to over-anxiousness social withdrawal and hyperactivity in peer support. In social support type it was significantly different according to over-anxiousness and social withdrawal in expressive support to socia withdrawal over-anxiousness hyperactivity and delinquency in esteem support and to over-anxiounsness in informational support.

  • PDF

청약과 관련한 CISG규정하에서 이루어지는 전자통신에 유엔전자협약 적용시 유의사항 (A Study on Notable Points in Mind for the Use of Electronic Convention to be Made under CISG in Connections with Offer)

  • 오세창
    • 무역상무연구
    • /
    • 제38권
    • /
    • pp.3-45
    • /
    • 2008
  • A motive and aim of enactment of UN Convention on the Use of Electronic Communication in Int'l Contracts is based on need to eliminate legal obstacles that might arise under existing int'l trade law instruments and promote int'l electronic commercial transaction. But when it is used with related articles, 14, 15, 16, 17 for offer under CISG, one of the most successful conventions which produces substantive law for the unification of int'l trade, questions of practical importance, for example possibilities of withdrawal, revocation, rejection of offer, the extent of its criteria arise from therewith. In conclusion, a effective electronic offer has to assure easily access and confirmation of trade terms besides criteria of offer under CISG. An offer can be withdrawal, if electronic message of withdrawal has entered the offeree's server before or at the same time when the offer has reached the offeree but agreement expressly or impliedly, between the parties about type, format, email address is a prerequisited. Implied consent could be presumed through prior conduct or trade usages between the parties under CISG articles 8, 9. The term "have reached" correspond to the time which is able to retrieve the electronic message of withdrawal. But without express or implied agreement between them about electronic communication of type, format, email address, an offer can be withdrawal before or at the same time when it has entered offeree's other e-mail address and confirmed by his retrieval. In case of the revocation, electronic message of the revocation is effective before the offeree's dispatching an acceptance. A prerequisite for the revocation by electronic communication is came as the above mentioned withdrawal except for concept of a time difference for reach. In case of a rejection of offer, when a rejection by electronic communication has entered the offeror's server, an offer is ended. But a prerequisite for the rejection by electronic message is same as the above mentioned withdrawal and revocation.

  • PDF

위드로월 가중형 SAW 사다리 필터의 최적화 (Optimization of Withdrawal Weighted SAW Ladder Filters)

  • 이영진;이승희;노용래
    • 한국음향학회지
    • /
    • 제21권2호
    • /
    • pp.102-109
    • /
    • 2002
  • 본 논문에서는 위드로월 (withdrawal) 가중형 SAW필터를 자동으로 최적화할 수 있는 설계도구의 개발 내용을 제시하였다. SAW 공진기에 위드로월 가중법이 적용될 경우, 향상된 대역폭 및 천이대역 특성을 구현할 수 있으며, 이러한 위드로월 가중효과를 이용하여 사다리형 위드로월 SAW필터의 최적화도구를 완성하였다. 본 설계방법의 유효성을 검증하기 위하여 RF 대역 CDMA용 TX 및 RX SAW 필터를 본 설계도구를 이용하여 최적화하였으며 실제 실험 결과, 이론과 매우 잘 일치함을 알 수 있었다.

흰쥐의 술 후 통증 모델에서 T형 칼슘 통로 차단제인 Ethosuximide와 Mibefradil의 항통각과민 효과 (Antihyperalgesic Effects of Ethosuximide and Mibefradil, T-type Voltage Activated Calcium Channel Blockers, in a Rat Model of Postoperative Pain)

  • 신혜란;차영덕;한정욱;윤정원;김부성;송장호
    • The Korean Journal of Pain
    • /
    • 제20권2호
    • /
    • pp.92-99
    • /
    • 2007
  • Background: A correlation between a T-type voltage activated calcium channel (VACC) and pain mechanism has not yet been established. The purpose of this study is to find out the effect of ethosuximide and mibefradil, representative selective T-type VACC blockers on postoperative pain using an incisional pain model of rats. Methods: After performing a plantar incision, rats were stabilized on plastic mesh for 2 hours. Then, the rats were injected with ethosuximide or mibefradil, intraperitoneally and intrathecally. The level of withdrawal threshold to the von Frey filament near the incision site was determined and the dose response curves were obtained. Results: After an intraperitoneal ethosuximide or mibefradil injection, the dose-response curve showed a dose-dependent increase of the threshold in a withdrawal reaction. After an intrathecal injection of ethosuximide, the threshold of a withdrawal reaction to mechanical stimulation increased and the increase was dose-dependent. After an intrathecal injection of mibefradil, no change occurred in either the threshold of a withdrawal reaction to mechanical stimulation or a dose-response curve. Conclusions: The T-type VACC blockers in a rat model of postoperative pain showed the antihyperalgesic effect. This effect might be due to blockade of T-type VACC, which was distributed in the peripheral nociceptors or at the supraspinal level. Further studies of the effect of T-type VACC on a pain transmission mechanism at the spinal cord level would be needed.

The Analysis of Vitamin C Concentration in Organs of $Gulo^{-/-}$ Mice Upon Vitamin C Withdrawal

  • Kim, Hye-Min;Bae, Se-Yeon;Yu, Yeon-Sil;Kim, Ye-Jin;Kim, Hang-Rae;Hwang, Young-Il;Kang, Jae-Seung;Lee, Wang-Jae
    • IMMUNE NETWORK
    • /
    • 제12권1호
    • /
    • pp.18-26
    • /
    • 2012
  • Background: Vitamin C is an essential nutrient for maintaining human life. Vitamin C insufficiency in the plasma is closely related with the development of scurvy. However, in vivo kinetics of vitamin C regarding its storage and consumption is still largely unknown. Methods: We used $Gulo^{-/-}$ mice, which cannot synthesize vitamin C like human. Vitamin C level in plasma and organs from $Gulo^{-/-}$ mice was examined, and it compared with the level of wild-type mice during 5 weeks. Results: The significant weight loss of $Gulo^{-/-}$ mice was shown at 3 weeks after vitamin C withdrawal. However, there was no differences between wild-type and vitamin C-supplemented $Gulo^{-/-}$ mice (3.3 g/L in drinking water). The concentration of vitamin C in plasma and organs was significantly decreased at 1 week after vitamin C withdrawal. Vitamin C is preferentially deposited in adrenal gland, lymph node, lung, and brain. There were no significant changes in the numbers and CD4/CD8 ratio of splenocytes in $Gulo^{-/-}$ mice with vitamin C withdrawal for 4 weeks. And the architecture of spleen in $Gulo^{-/-}$ mice was disrupted at 5 weeks after vitamin C withdrawal. Conclusion: The vitamin C level of $Gulo^{-/-}$ mice was considerably decreased from 1 week after vitamin C withdrawal. Vitamin C is preferentially stored in some organs such as brain, adrenal gland and lung.

한국 변호사들의 연명치료중단에 대한 태도 (Attitude of Korean Lawyers toward Withdrawal of Life Sustaining Treatment)

  • 이경남;김분한;이훈희
    • Journal of Hospice and Palliative Care
    • /
    • 제13권2호
    • /
    • pp.81-88
    • /
    • 2010
  • 목적: 본 연구는 연명치료중단에 대한 한국변호사들의 태도유형을 구분하고, 각 유형별 특성과 유형별 차이점을 파악하는 주관성 연구를 위해 실시되었다. 방법: 본 연구 설계는 Q 방법론을 이용하였다. 본 연구의 대상자는 32~69세의 변호사 24명을 대상으로 하였다. 연명치료중단에 대한 태도 유형을 확인하기 위한 Q 표본은 이들 중 5인을 대상으로 한 심층면담, 문헌고찰, TV토론을 통해 확보하여 34문항의 진술문을 구성하였다. 대상자에게 연구의 목적과 방법을 설명하여 동의를 구한 후 인구사회학적 특성을 파악하기 위한 질문지를 작성하였고, 9점 Q 표본 분포도상에 강제 분포하도록 하였다. 결과: 수집된 자료는 QUANL PC 프로그램으로 처리하여 최종적으로 유형을 구분하였다. 그 결과 5가지 유형이 구분되었으며, 제1유형은 연명치료중단에 대한 확고한 신념이 있는 '연명치료중단 선택형', 제2유형은 비용이 얼마나 소요되든지 생명연장술을 시행하여야 한다는 '생명연장술 추구형', 제3유형은 연명치료중단이나 생명연장술이나 모두 인간의 권리에 해당하며, 이런 권리를 충분히 행사하기 위해 제도적 장치를 요구하는 '제도요구형', 제4유형은 연명치료중단에 동의를 하지만, 본인은 연명치료중단을 선택하지 않을 것이라는 모순된 태도를 보이는 '자기모순형', 제5유형은 생명은 하나님만이 판단할 수 있다고 하고, 인간에게는 죽음을 선택할 권리가 없다는 '인명재천형'으로 분석되었다. 결론: 연명치료중단에 대한 한국 변호사들의 태도는, 제1유형 '연명치료중단 선택형', 제2유형 '생명연장술 추구형', 제3유형 '제도요구형', 제4유형 '자기모순형', 제5유형 '인명재천형'으로 나타났다.