• 한국의류산업학회지
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• 제2권5호
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• pp.430-436
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• 2000

The purpose of the study was to obtain the basic data on the self-adjusting ability of the support panty stockings. Ten healthy women in the twenties were selected as subjects and clothing pressure of 9 support panty stockings made of single covered yarn (SCY) and double covered yarn (DCY) were measured under the standard environmental condition for the study. Data was analysed statistically according to body postures, sides, and parks. The results were as follows: Clothing pressure according to body posture was order of 'sitting-on-a-chair', 'stepping-up-a-stair', and 'standing'. High clothing pressure was obtained in the parts of calf ($9.4gf/cm^2$) in 'standing' and knee (9.7 and $16.5gf/cm^2$) in both 'stepping-up-a-stair' and 'sitting-on-a-chair', respectively. The order of clothing pressure with body sides was 'front', 'side', and 'back'. The highest clothing pressure was knee ($18.8gf/cm^2$) on the front, thigh ($8.8gf/cm^2$) on the side, and calf ($6.4gf/cm^2$) on the back. Clothing pressure of DCY at abdomen and knee was a little higher than those of SCY 3. In terms of material structure variation, clothing pressure of thigh, calf and ankle with SCY was a little higher than those with DCY, while clothing pressure of abdomen and knee with DCY was a little higher than those with SCY.

• 대한화학회지
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• 제36권3호
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• pp.405-411
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• 1992

Equatorial-Skew형 [Co(TRDTRA)($OH_2$)]착물과 $CN^-, NO^{-}_{2}$ 그리고 $NCS^-$ 이온 간의 치환반응 결과 생성된 착물의 치환반응성 및 구조를 전자흡수 스펙트럼과 Yamatera 이론에 따라 조사하였다. 속도록적 자료로부터 착물과 $CN^-, NO^{-}_{2}$ 그리고 $NCS^-$ 이온의 반응차수는 각각 1차이며 총괄 반응차수는 2차임을 알 수 있었다. $CN^-$ 및 $NO^{-}_{2}$ 이온에서 생성된 착물의 구조는 이성질화 반응이 동반된 Polar-Chair 형이며, $NCS^-$ 이온의 경우에는 이성질화 반응이 동반되지 않는 Equatorial-Skew 형임을 알 수 있었다.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.76-83
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• 2023

Squatting of agricultural work can cause musculoskeletal disorders due to excessive pressure and rotational force on the knee joint In order to improve the assistive chair used in squatting agricultural work so that it can be used in a narrow groove, it is intended to improve the musculoskeletal harm of squatting work by attaching a spring on the assistive chair. Therefore, in the presenty study, 3D drawing was done using ProEngineer (3D), and a mock-up was produced and tested. Using pro-Engineer, it was judged that it was rare for plastic to be broken by a spring, so the analysis was conducted with a focus on springs. It was found that the structure that can absorb the shock according to the rigidity of the tape spring and balance the body is that the power to withstand the load of the weight is distributed as a whole when five springs are used. Electromyography was measured using ME600 (Mega Electronics, Finland) Measuring equipment attached to the waist, thighs, calves, and shins. EMG values were measured and compared with the prototype in two ways, when the worker did not wear the product and when he wore an existing product on the market. As a result of the experiment when using the prototype, the maximum EMG value for each part is considered to be helpful in preventing musculoskeletal diseases as the amount of muscle used is reduced in the waist, thighs, calves, and shins.

• 대한화학회지
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• 제21권5호
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• pp.307-319
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• 1977

Thiourea derivative인 $N-({\alpha}-dimethyl\;{\beta}-hydroxy)ethyl\;N'-cyclohexyl\;thiourea,\;C_{ll}H_{22}N_2OS)$의 결정 및 분자구조를 X-선 회절법으로 해명하였다. 이 화합물의 결정은 공간군 $P_{bca}$에 속하는 orthorhombic 형으로 a = 10.33(3), b = 11.82(3), c = 22.57(4)${\AA}$ 이고 Z = 8이다. Weissenberg 사진촬영으로 얻은 회절반점의 총수는 1414개이며 중원자법을 이용하여 구조해명을 한 후 최소자승법으로 정밀화하였으며 최종 R값은 0.13이다. Cyclohexane ring은 normal chair conformation을, thiourea 부분은 평면을 이루고 있다. 일차 알코올의 hydroxyl group은 N(2)원자와 분자내 수소결합을 이뤄서 전체분자를 안정화시키고 있다. 분자들은 결정내에서 수소결합과 van der Waals힘으로 서로 결합되어 있다. 분자내 수소결합 N(2)-H${\cdot}{\cdot}{\cdot}$O는 강한 수소결합으로 N${\cdot}{\cdot}{\cdot}$O 길이는 2.71${\AA}$이고, 분자간 수소결합 O${\cdot}{\cdot}{\cdot}$H${\cdot}{\cdot}{\cdot}$S의 O${\cdot}{\cdot}{\cdot}$S 길이는 3.02${\AA}$으로 b축에 나란하다.

• 한국실내디자인학회논문집
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• 제21호
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• pp.173-181
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• 1999

Design has been proceeding to 21 century undertaking the many-sided and complicated characteristics of the modern industrialized society much more heavily comparing to past. The rapid change of technology and media of communication faces the new concept of relationship between users and environment, and newly developed material leads designers to change the way of building concept and the process of designing. Especially the important points of user-friendly and environment-friendly approaching for designing influences over choosing, controlling meterials and forming the structure and shape organically, or simply. From the tendency of chairs designed in 1990s the very adaptable new material shows both the unlimited possibility for new design is in the turn of this century, but also it can be analogized that 'the design which can make users think' will be the philosophical basis for future desigv.

• Journal of Korean Neurosurgical Society
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• 제52권4호
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• pp.414-416
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• 2012

A 38-year-old man fell from a chair with a chopstick in his hand. The chopstick penetrated his left eye. He noticed pain, swelling, and numbness around his left eye. On physical examination, a linear wound was noted at the medial aspect of the left eyelid. Noncontrast computed tomography (CT) study showed a linear hypodense structure extending from the medial aspect of the left orbit to the occipital bone, suggesting a foreign body. This foreign body was hyperdense relative to normal parenchyma. From a CT scan with 3-dimensional reconstruction, the foreign body was found to be passing through the optic canal into the cranium. The clear plastic chopstick was withdrawn without difficulty. The patient was discharged home 3 weeks after his surgery. A treatment plan for a transorbital penetrating injury should be determined by a multidisciplinary team, with input from neurosurgeons and ophthalmologists.

• 대한치과의사협회지
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• 제21권5호통권168호
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• pp.395-402
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• 1983

The purpose of this study was to apply the etched metal ceramometal retainer using a composite resin and acid-etch procedure with minimal tooth reduction of abutments for the replacement of one missing anterior or posterior tooth. Author obtained the following conclusions. 1. conservation of tooth structure and minimal chair time and patient expense were the primary advantages of etched metal retainer. 2. This fixed partial denture permitted good esthetic results. 3. This retainer was successfully applied for the replacement of one missing anterior or posterior tooth. 4. Proper retainer etching ws an important procedure. 5. Etched castings could be applied to periodontal splinting and post orthodontic fixation.

• Bulletin of the Korean Chemical Society
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• 제30권2호
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• pp.415-418
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• 2009

Concerned with ambiguous stereochemistry assignment of natural (+)-glabridin, absolute configurations of (${\pm}$)-glabridin enantiomers were studied with synthetic glabridin. Synthetic glabridin enantiomers were separated by semi-preparative Sumi-chiral column chromatography, and characterized by UV-Vis and NMR spectroscopy. Three-dimensional molecular structure of glabridin was obtained as equatorial Ph-3 half chair chroman ring from semi-empirical PM3 calculation, and refined by coupling constants in $^1H$ NMR spectrum. Finally, absolute configurations of two enantiomers were determined by circular dichroism spectroscopy based on the empirical helicity rules. Absolute configuration of natural (+)-glabridin was confirmed as (R)-glabridin, as known.

• 한국가구학회지
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• 제13권2호
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• pp.75-84
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• 2002

The chairs are one of the most important furniture in this modern society, as we know that history of furniture is made of history of the chairs. Among the chairs, the stool, which made by only sit and legs, forms the basis of the chairs. The stool plays an important part in the human body to support and also help to make an agile movement In a short period of time. The stool is the minimum unit of chair, which made of least size and simple structure; therefore it fits to study basic knowledge of furniture making. For that reason, we can see occasionally the schools of furniture design departments have chosen the stool making course in their foundation students' studio classes. However, the professional study on the stool, such as the study on the posture for designing stool, has not been developed yet. This study presents basic Information of design for stool by analyzing various stools formatively.

• 한국결정학회지
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• 제5권2호
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• pp.100-107
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• 1994

분자내 (2+2) 광고리화 반응을 통하여 pyridine의 새로운 N1-pentenyl유도체가 얻어졌다. 이 물질의 구조는 단 결정 X-선 회절법에 의해 해석되었다. 이 화합물은 rhombohedral계( R3, a=27.767(5)A, c=6.390(2)A)로 결정화된다. 이 구조에서는 2개의 6각 고리와 1개의 4각 고리가 N-C 또는 C-C bonds를 공유하면서 fuse되어 있고, pyridine고리는 의자모양의 형태를 취하고 있다. 점대칭으로 연관된 한 쌍의 분자들이 uracil 부분의 N,0 원자 사이의 H를 통하여 수소결합을 생성하고 있는 것이 관찰되었다.