• Applied Microscopy
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• v.17 no.1
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• pp.1-15
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• 1987

Testes from the allied rock wallaby(Petrogale assimilus) have been examined by the electron microscopy in thin sections in order to examine spermiogenesis and structure of spermatozoa. The spermiogenesis can be divided into nine stages: early Golgi, late Golgi, collapsing, nuclear protrusion, condensation and flattening, nuclear shaping, rotation, nuclear ring contraction, and maturation. The acrosome has been abruptly formed following the collapse of expanded acrosomal vesicle without the cap stage described in the eutheria. The flatly condensed nucleus rotates obliquely to the axis of the axial filament complex and the folded acrosome covers the anterior third of the dorsal nuclear surface forming a wide subacrosormal space as the nuclear ring has contracted. The Sertoli cell reaction and spur are prominent during the nuclear protrusion and rotation stages. A mature spermatozoon has S-shape head which has an extended part reaching to the vicinity of the middle piece.

• The Journal of Korean Physical Therapy
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• v.15 no.4
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• pp.129-139
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• 2003

Cranio sacral therapy is a refinend and subtle type of osteopathic treatment that encourages the realease of stresses and tentions throughout the body, including the head. Cranio sacral therapy is trained to feel a very subtle, rhythmical shape change that is present in all tissue. This is called Involuntary Motion or Cranial Rhythm. The movement is of very small amplitude therefore it takes practitioners with a very finely developed sense of touch to feel it. This Rhythm was first described in the early 1900's by Dr. William G. Sutherland and its existence was confirmed in laboratory tests in the 1960's and 1970's. Tension in the body disrupts the cranial rhythm. This shows them what stresses and strains your body is under a present and what tentions it may be carrying as a result of its past history.

• Journal of the Korean Home Economics Association
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• v.48 no.6
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• pp.31-41
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• 2010

This study aims to analyze the characteristics and styles of wearing scarves in the contemporary fashion. Scarf-wearing styles found in the contemporary fashion are as follows: 1) Scarves are used as gorgeous hair accessories which are tied around the head like a headband, turban. 2) The second style is to wear scarves around the neck, which involves a variety of ideas. 3) Shawl-like scarves add elegance and femininity to any outfit when they are draped over the shoulders. 4) Scarves are also worn instead of or in addition to a belt with a dress, skirt, pants. 5) The style is to tie a scarf in knots at the back of the neck and the waist as it is shaped or in a diagonally half-folded shape. 6) You can tie a scarf to your hat or handbag or connect a long scarf to one part of your body.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.10a
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• pp.500-504
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• 2004

The bio-micro pin has been usually used for the biochemistry analysis. The manufacturing capability of the micro-pin and the their array with the effective and low-cost way is very important and it gives great economical benefits to developers. The micro-pin is composed of the sample channel for holding the liquid with the fixed volume, the flat tip which determines the printing quality and the pin head for preventing the rotation of the pin in the holder. In this study, we have manufactured newly designed micro-pins by the wire-EDM process with special jigs, and analyzed liquid holding and printing characteristics with respect to the variation of the shape and the tip size of the micro-pin.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1075-1080
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• 2008

An engine for marine propulsion and power generation consists of several cylinder liner-piston sets. And the oil groove is on the cylinder liner inside wall for the lubrication between a piston and cylinder. The machining process of oil groove has been carried by manual work so far, because of the diversity of the shape. Recently, we developed an automatic grinding robot system for oil groove machining of engine cylinder liners. It can covers various types of oil grooves and adjust its position by itself. The grinding robot system consists of a robot, a machining tool head, sensors and a control system. The robot automatically recognizes the cylinder liner's inside configuration by using a laser displacement sensor and a vision sensor after the cylinder liner is placed on a set-up equipment.

• Geomechanics and Engineering
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• v.20 no.5
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• pp.421-432
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• 2020

Cutting of rocks is very common encountered in tunneling and mining during underground excavations. A deep understanding of rock-tool interaction can promote industrial applications significantly. In this paper, a distinct element method based approach, PFC^3D, is adopted to simulate the rock cutting under different operation conditions (cutting velocity, depth of cut and rake angle) and with various tool geometries (tip angle, tip wear and tip shape). Simulation results showed that the cutting force and accumulated number of cracks increase with increasing cutting velocity, cut depth, tip angle and pick abrasion. The number of cracks and cutting force decrease with increasing negative rake angle and increase with increasing positive rake angle. The numerical approach can offer a better insight into the rock-tool interaction during the rock cutting process. The proposed numerical method can be used to assess the rock cuttability, to estimate the cutting performance, and to design the cutter head.

• Journal of the Korean Society of Costume
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• v.50 no.3
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• pp.43-58
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• 2000

This study is an analysis on the costumes of two statuettes of standing women made with three colored cermai excavated from Parhae tomb in Shiguo(석국), Chilin province(길림성), China. These statuettes wear similar clothing ; A narrow sleeved under-blouse with a decollette neckline and a long skirt tied above the bosom. But their hairstyles are quite different ; one has a bun top of the head which tipped slightly forward. the other has two buns with two loops near ears. Their shoes are a little different: in the former the top of the shoes are a little crooked, but in the latter they are high-fronted and more crooked. These two statueettes are valueable and unique source which demonstrates the female costumes of Parhae dynasty, and at the same time which accounts for the acceptance and assimilation of costumes of Tang dynasty. Base upon the analysis on their costumes, hairstyles , and their expressions of the body shape, two statuettes seem to be made after the early 8th century.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.568-573
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• 2000

In this study, experimental and numerical analyses are carried out to investigate the performance of centrifugal pump with various air admitting conditions. Experiments on pump performance under air-water two-phase flow n accomplished using a centrifugal pump with semi-open type impeller having three, five and seven blades, respectively. Also, the numerical analysis of turbulent air-water two-phase flow using finite volume method has been carried out to obtain the pressure, velocities and void fraction on the basis of a so-called bubbly flow model with the constant size and shape of cavity. The results obtained through this study show the reasonable agreements within the range of bubbly flow regime. There are promising developments concerning application of the present study for the flow in a centrifugal pump with two-phase flow conditions and efforts must be followed to improve the turbulence model and two-phase flow model for turbomachinery.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1506-1511
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• 2003

This paper describes an automatic weld seam tracking method of plasma arc welding system designed for the corrugation panel that consists of a linear section and a curved section with various curvatures. Due to the complexity of the panel shape, it is difficult to find a seam and operate a torch manually in the welding process. So, the laser vision sensor for seam tracking is designed for sensing the seam position and controlling a torch automatically. To achieve precise seam tracking, the design of sensor head, image simulation, and calibration are carried out. Through a series of experiment result, compensation algorithm is added and real time error compensation is achieved. The experiment result shows that this vision sensor works effectively. It will provide more precise welding performance and convenience to the operator.

• Korean Journal of Clinical Laboratory Science
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• v.36 no.1
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• pp.7-12
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• 2004

Trichophyton(T.) tonsurans has been identified for the first time in Korea in 1995 and has been increasing in number of reported in wrestlers, in judo players, and in korean - style wrestlers. Author tried mycological studies with T. tonsurans is isolated in Daegu Korea. The results are as follows: All 16 strains of T. tonsurans tested for nutritional requirement, showed strongly stimulated growth by thiamine, mild to moderate growth on casamino acid agar, poor growth on ammonium nitrates base agar. All 16 strains of T. tonsurans tested showed positive results for hair perforation and urease test. Gross findings of T. tonsurans showed that fine granular surface with light yellow hue or white color and mahogany brown color on the reverse side. Microscopic findings showed that septated hyphae, chlamydoconidia and microcondia. Microconidia were characteristic in their arrangerment and shape : round or oval shaped microconidia laterally to hyphae, some were match - head like terminal swelling.